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Cirrus Logic Inc patents


Recent patent applications related to Cirrus Logic Inc. Cirrus Logic Inc is listed as an Agent/Assignee. Note: Cirrus Logic Inc may have other listings under different names/spellings. We're not affiliated with Cirrus Logic Inc, we're just tracking patents.

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Mems transducer package

A mems transducer package comprising a substrate; a filter circuit for filtering rf signals, the filter circuit comprising a resistor and a capacitor; and an ipd chip; wherein at least a portion of the filter circuit is provided within the ipd chip.. . ... Cirrus Logic Inc

Mems devices and processes

The application relates to mems microphone transducers having a vent structure provided in the membrane layer and an opening formed at the vent structure for tuning the frequency response of the microphone.. . ... Cirrus Logic Inc

Audio connector and circuitry

A device (10) for connection to an audio accessory (20) comprising: a jack socket (14) for connection to a jack plug (25) of the audio accessory (20), a ground connection to a first socket contact (428) which is positioned to mate with a ground return pole of the plug (25). The jack socket (14) comprises a second contact (432) also positioned to mate with the ground return pole of the plug (25). ... Cirrus Logic Inc

Mems transducer amplifiers

This applications relates to methods and apparatus for amplifying signals from capacitive transducers, in particular mems transducers such as mems capacitive microphones. An amplifier circuit has a transducer biasing node (102) for outputting a transducer bias voltage for biasing the capacitive transducer (101) and a signal node (103) for receiving the input signal (vin). ... Cirrus Logic Inc

Clock generator

A clock generator receives first and second clock signals, and input representing a desired frequency ratio. A comparison is made between frequencies of an output clock signal and the first clock signal, and a first error signal represents the difference between the desired frequency ratio and this comparison result. ... Cirrus Logic Inc

Digital pwm modulator

An improved class-d amplifier may include a digital pwm modulator that receives a digital audio signal and that provides a pwm signal as an input to an analog pwm modulator of the class-d amplifier. A digital pwm modulator may be configured to receive a digital signal and to generate a first pwm signal based on the digital signal. ... Cirrus Logic Inc

Bass enhancement

A bass enhancement may be applied to improve the perception of low-frequency sounds by a user of an electronic device. A distortion function may be applied to the audio signal that results in creation of higher frequency content related to the low-frequency sounds. ... Cirrus Logic Inc

Voice activity detection employing running range normalization

A “running range normalization” method includes computing running estimates of the range of values of features useful for voice activity detection (vad) and normalizing the features by mapping them to a desired range. Running range normalization includes computation of running estimates of the minimum and maximum values of vad features and normalizing the feature values by mapping the original range to a desired range. ... Cirrus Logic Inc

Pulse code modulation (pcm) data-marking

An encoding for data in an audio data stream may be indicated in the data stream using a footer stored in low-order bits of data frames in the audio data stream. When the audio data stream may include either pulse code modulation (pcm) or direct stream digital (dsd) data, pcm data may be marked with a footer to indicate the encoding as pcm. ... Cirrus Logic Inc

Reducing instantaneous wind noise

Wind noise reduction is provided by obtaining a first signal from a first microphone and a contemporaneous second signal from a second microphone. A level of the first signal is compared to a level of the second signal, within a short or substantially instantaneous time frame. ... Cirrus Logic Inc

Charge pump with current mode output power throttling

A system may include a charge pump configured to boost an input voltage of the charge pump to an output voltage greater than the input voltage, a current mode control loop for current mode control of a power amplifier powered by the output voltage of the charge pump, and a controller configured to, in a current-limiting mode of the controller, control an output power of the charge pump to ensure that an input current of the charge pump is maintained below a current limit, control the power amplifier by placing the power amplifier into a high-impedance mode during the current-limiting mode, and control state variables of a loop filter of the current mode control loop during the current-limiting mode.. . ... Cirrus Logic Inc

Boosted amplifier with current limiting

A boosted amplifier system may include a boost stage configured to boost an input voltage of the boost stage to an output voltage greater than the input voltage and an amplifier stage powered by the output voltage of the charge pump and configured to amplify an input signal to generate an output signal. The boost stage may have input current limiting circuitry for ensuring that an input current of the boost stage is maintained below a current limit and the amplifier stage may have an input for receiving an indication of whether the current-limiting circuitry of the boost stage is activated to maintain the input current of the boost stage below the current limit.. ... Cirrus Logic Inc

Boost converter with forced continuous conduction mode

A method may include operating a dc-dc switch converter in a forced continuous conduction mode in which for each switching cycle of the switch converter during the forced continuous conduction mode, the switch converter operates in a series of phases including: a first phase in which an inductor current flowing in an inductor of the switch converter increases from zero to a controlled positive current magnitude with respect to a first terminal and a second terminal of the inductor; a second phase in which the inductor current decreases from the controlled positive current magnitude to approximately zero; a third phase in which the inductor current decreases from approximately zero to a controlled negative current magnitude with respect to a first terminal and a second terminal of the inductor; and a fourth phase in which the inductor current increases from the controlled negative current magnitude to approximately zero.. . ... Cirrus Logic Inc

Motion detector

An ultrasonic motion activity detector is configured to, in each of a series of frames: obtain an ultrasonic signal derived from a transmitted ultrasonic signal; derive an activity signal based on a difference between the obtained signal in a present frame and at least one previous frame; determine a peak value of the activity signal in a first time window of the frame; determine a peak value of the activity signal in a second time window of the frame, wherein the first time window is different from the second time window; calculate a ratio of the peak value of the activity signal in the first time window of the frame to the peak value of the activity signal in the second time window of the frame; and compare the calculated ratio with a threshold value, and, in frames in which the calculated ratio exceeds the threshold value, determine that there is motion of an object relative to the detector.. . ... Cirrus Logic Inc

08/02/18 / #20180220233

Speaker enclosure status

The reliability and resilience of a speaker in a portable device may be improved by enabling the device to determine a status of an enclosure of a transducer. The impedance profiles of transducers vary depending on the enclosure status, whether the enclosure is leaky, ported, or sealed. ... Cirrus Logic Inc

08/02/18 / #20180218745

Direct mapping

A single-bit audio stream can be converted to a modified single-bit audio stream with a constant edge rate while maintaining a modulation index of the original audio stream using direct mapping. With direct mapping, a pre-filter bank may be combined with a multi-bit symbol mapper to select symbols for the modified audio stream with a constant edge rate per symbol and the same modulation index as the original audio stream. ... Cirrus Logic Inc

08/02/18 / #20180218744

Auto-mute audio processing

An audio processing circuit may have a first path for processing multi-bit audio signals in parallel with a second path for processing single-bit audio signals. The parallel paths may share a common input node for receiving audio data and a common output node for reproducing audio at a transducer. ... Cirrus Logic Inc

08/02/18 / #20180217807

Single-bit volume control

Audio content in a single-bit audio stream can be reproduced at a transducer by mapping the single-bit audio stream to symbols in a multi-bit audio stream. Volume control may be implemented, in part, in the digital domain and, in part, in the analog domain. ... Cirrus Logic Inc

07/26/18 / #20180213322

Loudspeaker protection systems and methods

A method of thermal protection of a voice coil of a loudspeaker comprises: determining an estimate of a temperature of the voice coil, determining an estimate of a rate of change of the temperature of the voice coil, determining an estimate of power dissipation in the voice coil, and generating a gain control signal for modulating a gain applied to an input signal in a signal path between an input terminal and said loudspeaker. The gain control signal is generated as a function of all of said estimate of the temperature of the voice coil, said estimate of the rate of change of the temperature of the voice coil, and said estimate of the power dissipation in the voice coil.. ... Cirrus Logic Inc

07/26/18 / #20180212570

Closed-loop digital compensation scheme

Resistor mismatch may be digitally compensated based on a known resistor mismatch, power supply information, and/or other operating parameters of the amplifier. The digital compensation may be applied to the digital input signal before conversion for processing and amplification in the analog domain. ... Cirrus Logic Inc

07/26/18 / #20180212569

Offset calibration for amplifier and preceding circuit

A method may include, in an apparatus comprising a closed loop amplifier and a signal processing block configured to generate an amplifier input signal as a function of an upstream signal received at an input of the signal processing block, in a calibration mode of the apparatus: decoupling a second stage input of the amplifier from a first stage output of the amplifier; determining an offset signal that when applied to the input of a signal processing block as the upstream signal generates approximately zero as an intermediate signal generated by the first stage of the amplifier; and controlling one or more parameters of the apparatus based on the offset signal to compensate for an offset of at least one of the first stage and the signal processing block.. . ... Cirrus Logic Inc

07/26/18 / #20180211683

Adaptive filter control

A sound processing circuit comprises a first input for receiving a first input signal, and a second input for receiving a second input signal. A first adaptive filter receives the first input signal, and an error calculation block calculates an error between the second input signal and the output of the first adaptive filter, and outputting an error signal. ... Cirrus Logic Inc

07/26/18 / #20180208454

Flexible membrane

There is provided a flexible membrane for use in a microelectromechanical transducer, the flexible membrane comprising an electromagnetic waveguide. There is further provided a microelectromechanical system comprising a substrate which comprises the flexible membrane, and a process for forming the flexible membrane. ... Cirrus Logic Inc

07/19/18 / #20180206034

Method for limiting amplifier input current to avoid low voltage conditions

A predictive brownout prevention system may be configured to prevent brownout of an audio output signal. Particularly, the brownout prevention system may be configured to receive information indicative of adaptive estimates of power supply conditions, wherein the information indicative of adaptive estimates of the power supply conditions comprises information regarding a voltage component and a resistive component received from an adaptive battery model of a battery for providing electrical energy to a power supply for generating the power supply voltage and adapt the adaptive battery model based on a monitored battery voltage output by the battery and loading events of the signal path and excluding loading events of components other than the signal path which are powered from the battery.. ... Cirrus Logic Inc

07/19/18 / #20180205347

Systems and methods for predictive switching in audio amplifiers

An audio amplifier circuit for providing an output signal to an audio transducer may include a power amplifier and a control circuit. The power amplifier may include an audio input for receiving an audio input signal, an audio output for generating the output signal based on the audio input signal, and a power supply input for receiving a power supply voltage, wherein the power supply voltage is variable among at least a first supply voltage and a second supply voltage greater than the first supply voltage and wherein the power supply voltage is generated by a configurable charge pump power supply. ... Cirrus Logic Inc

07/05/18 / #20180192183

Detection circuit

Circuitry detects properties of an accessory removably connected thereto via a multi-pole connector. The circuitry has first, second and third circuit terminals for coupling to respective first, second, and third poles of said connector, and has an output for providing evaluation values from which properties of the accessory may be derived. ... Cirrus Logic Inc

07/05/18 / #20180191320

Amplifier with auxiliary path for maximizing power supply rejection ratio

An amplifier may include a main signal path having a plurality of stages compensated by feedback elements, the plurality of stages comprising an output stage configured to receive electrical energy from a power supply and an auxiliary path independent of the main signal path and comprising an output stage compensation circuit configured to generate a compensation current proportional to noise present in the power supply and apply the compensation current to cancel a power supply-induced current present in at least one of the feedback elements.. . ... Cirrus Logic Inc

07/05/18 / #20180190648

High density capacitors formed from thin vertical semiconductor structures such as finfets

A vertical structure may be used as a high density capacitance for an integrated circuit. These thin vertical structures can be configured to operate as an insulator in a metal-insulator-metal (mim) capacitor. ... Cirrus Logic Inc

06/28/18 / #20180184201

Loudspeaker protection

This application relates to methods and apparatus for loudspeaker protection. A loudspeaker protection system (100) receives a digital audio signal comprising a plurality of samples at an input node (in). ... Cirrus Logic Inc

06/21/18 / #20180176704

Method and apparatus for wind noise detection

Processing digitized microphone signal data in order to detect wind noise. A first signal and a second signal are obtained from at least one microphone. ... Cirrus Logic Inc

06/21/18 / #20180176675

Detection circuit

Circuitry detects properties of an accessory removably connected thereto via a multi-pole connector. The circuitry has first, second and third circuit terminals for coupling to respective first, second, and third poles of said connector, and has an output for providing evaluation values from which properties of the accessory may be derived. ... Cirrus Logic Inc

06/21/18 / #20180176034

Low power bidirectional bus

A method of sending information between first and second modules connected by a signal bus comprises generating a clock signal in the first module, and imposing the clock signal on a first line of the bus. A first pattern of bit values is transmitted from the second module to the first module on a second line of the bus, during first half-periods of each period of said clock signal. ... Cirrus Logic Inc

06/21/18 / #20180175879

Power-saving current-mode digital-to-analog converter (dac)

A digital-to-analog converter (dac) for an audio system in a media device, such as a portable media device or smart phone, may be operated to turn off portions of the dac to reduce power consumption. Segments of a segment-able dac may be powered off when the output level of the dac is lower than the full scale output of the dac. ... Cirrus Logic Inc

06/21/18 / #20180173661

Audio transfer

This application relates to transfer of digital audio data between a host device (200) and an accessory apparatus (101) that may be connected to the host device via a suitable connector (106), such as a usb connector. A path selector (240, 270) is operable to establish either a first digital data path (201) or a second digital data path (202) for transfer of digital data. ... Cirrus Logic Inc

06/21/18 / #20180170749

Mems device

A mems transducer, for instance a mems capacitive transducer, comprising: a flexible membrane, the flexible membrane comprising a conductive track; and a continuity testing circuit electrically connected to the conductive track. The conductive track may be electrically isolated from any further conductive regions of the flexible membrane. ... Cirrus Logic Inc

06/14/18 / #20180167744

Transducer packaging

The application describes a lid for a transducer package, wherein an interior surface of the lid is provided with a plurality of dimples. The dimples are provided in a ceiling surface of the lid or in a side-wall surface of the lid. ... Cirrus Logic Inc

06/14/18 / #20180167742

Transducer packaging

The applications describes lid designs for transducer packaging. The lid comprising at least one side wall which extends between a foot of the lid and an upper surface of the lid. ... Cirrus Logic Inc

06/14/18 / #20180166088

Data encoding detection

A data encoding may be determined by examining the data itself. By examining the data, such as by identifying characteristics of the data, the data encoding may be identified and the substantive information extracted from the data by decoding the data according to the identified data encoding. ... Cirrus Logic Inc

06/07/18 / #20180160235

Methods and apparatuses for driving audio and ultrasonic signals from the same transducer

Driver circuitry is disclosed for driving an electroacoustic transducer to provide an output comprising both ultrasonic and audio signal components. The driver circuitry comprises an adjustment module configured to reduce the level of said ultrasonic component signal in response to an increase in an operational variable indicative of a level of said audio signal component, while also increasing the pulse duration, duty cycle, repetition frequency or frequency span or bandwidth of the ultrasonic component.. ... Cirrus Logic Inc

06/07/18 / #20180160228

Speaker adaptation with voltage-to-excursion conversion

A speaker model may implement a direct voltage-to-excursion model in an adaptive filter for modeling the speaker without developing a first electrical-only model and then converting the model to a mechanical model. The voltage-to-excursion model may allow for modeling of different kinds of speakers, such as sealed, ported, or vented speakers. ... Cirrus Logic Inc

06/07/18 / #20180160227

Speaker protection excursion oversight

Speaker protection may be based on multiple speaker models with oversight logic that controls the speaker protection based on the multiple speaker models. At least one of the speaker models may be based on a speaker excursion determined from feedback information from the speaker, such as a current or voltage measured at the speaker. ... Cirrus Logic Inc

06/07/18 / #20180159490

Class d amplifier circuit

This application relates to class d amplifier circuits (200). A modulator (201) controls a class d output stage (202) based on a modulator input signal (dm) to generate an output signal (vout) which is representative of an input signal (din). ... Cirrus Logic Inc

06/07/18 / #20180159488

Amplifier with configurable final output stage

An amplifier may include a first stage configured to receive an input signal at an amplifier input and generate an intermediate signal which is a function of the input signal, and a final output stage configured to generate an output signal which is a function of the intermediate signal at an amplifier output, and a signal feedback network coupled between the amplifier output and input. The final output stage may be switchable among a plurality of modes including at least a first mode in which the final output stage generates the output signal as a modulated output signal which is a function of the intermediate signal, and a second mode in which the final output stage generates the output signal as an unmodulated output signal which is a function of the intermediate signal. ... Cirrus Logic Inc

06/07/18 / #20180158462

Speaker identification

A method of operation of a speaker recognition system comprises: performing a speaker recognition process on a received signal; disabling the speaker recognition process when a first speaker has been identified; performing a speech start recognition process on the received signal when the speaker recognition process is disabled; and enabling the speaker recognition process in response to the speech start recognition process detecting a speech start event in the received signal.. . ... Cirrus Logic Inc

05/31/18 / #20180152798

Microelectromechanical systems microphone with electrostatic force feedback to measure sound pressure

A mems may include a backplate comprising first and second electrodes electrically isolated from one another and mechanically coupled to the backplate in a fixed relationship relative to the backplate, and a diaphragm configured to mechanically displace relative to the backplate as a function of sound pressure incident upon the diaphragm. The diaphragm may comprise third and fourth electrodes electrically isolated from one another and mechanically coupled to the diaphragm in a fixed relationship relative to the diaphragm such that the third and fourth electrodes mechanically displace relative to the backplate as the function of the sound pressure. ... Cirrus Logic Inc

05/31/18 / #20180152794

Biasing of electromechanical systems transducer with alternating-current voltage waveform

A mems microphone may include a backplate comprising first and second electrodes electrically isolated from one another and mechanically coupled to the backplate in a fixed relationship relative to the backplate and a diaphragm configured to displace relative to the backplate as a function of sound pressure incident upon the diaphragm, the diaphragm comprising third and fourth electrodes electrically isolated from one another and mechanically coupled to the diaphragm in a fixed relationship relative to the diaphragm such that the third and fourth electrodes displace relative to the backplate as a function of sound pressure incident upon the diaphragm. The first and third electrodes may form a first capacitor and the second and fourth electrodes may form a second capacitor, the capacitance of each which may be a function of the displacement of the diaphragm, and each of which may be biased by an alternating-current voltage waveform.. ... Cirrus Logic Inc

05/31/18 / #20180152792

Mems device

A mems transducer comprising: a flexible membrane, the flexible membrane comprising a first membrane electrode; a back plate, the back plate comprising a first back plate electrode; wherein the back plate is supported in a spaced relation with respect to the flexible membrane. The mems transducer is configured to provide electrical connections to the first membrane electrode and the first back plate electrode. ... Cirrus Logic Inc

05/31/18 / #20180152446

System and method for speaker recognition on mobile devices

A speaker recognition system for authenticating a mobile device user includes an enrollment and learning software module, a voice biometric authentication software module, and a secure software application. Upon request by a user of the mobile device, the enrollment and learning software module displays text prompts to the user, receives speech utterances from the user, and produces a voice biometric print. ... Cirrus Logic Inc

05/31/18 / #20180152198

Analogue-to-digital converter

This application relates to analogue-to-digital converters (adcs). An adc 200 has a first converter (201) for receiving an analogue input signal (ain) and outputting a time encode signal (dt), such as a pulse-width-modulated (pwm) signal, based on input signal and a first conversion gain setting (gin). ... Cirrus Logic Inc

05/31/18 / #20180152174

Noise reduction in voltage reference signal

A variable resistor may be coupled between a reference voltage source and components of an integrated circuit to reduce issues relating to thermal noise from a reference voltage signal generated by the reference voltage source. The variable resistor may be set to a low level during a first time period and a high level during a second time period, in which the time periods correspond to a sampling period of a switched-capacitor circuit. ... Cirrus Logic Inc

05/31/18 / #20180152101

Charge pump output power throttling

A system may include a charge pump configured to boost an input voltage of the charge pump to an output voltage greater than the input voltage and a controller configured to control an output power of the charge pump to ensure that an input current of the charge pump is maintained below a current limit.. . ... Cirrus Logic Inc

05/31/18 / #20180148315

Mems devices and processes

The application describes a mems transducer comprising a substrate having a cavity. The transducer exhibits a membrane layer supported relative to the substrate to define a flexible membrane. ... Cirrus Logic Inc

05/17/18 / #20180139498

Implied media networks

A system and/or media network for rendering a media stream from one or more media rendering devices is disclosed. The media network may include one or more configurable peers, each configurable peer configurable as a rendering device, an observer, a processing device, a combination thereof, or the like. ... Cirrus Logic Inc

05/17/18 / #20180136899

Adaptive receiver

A nonlinear control system and a speaker protection system are disclosed. In particular, a control system for adapting an audio output from a speaker in the proximity of an object is disclosed. ... Cirrus Logic Inc

05/10/18 / #20180132049

Non-linear control of loudspeakers

A nonlinear control system includes a controller, a model updater, and a model. The controller is configured to accept one or more input signals, and one or more updates generated by the model updater to produce one or more control signals. ... Cirrus Logic Inc

05/10/18 / #20180130475

Methods and apparatus for biometric authentication in an electronic device

Embodiments of the disclosure provide methods and apparatus in which a biometric authentication score generated as the result of a biometric authentication algorithm is compared to a threshold value that can be dynamically varied as required to provide a variable level of security. For example, the threshold value may be varied in dependence on the semantic content of a voice signal, and/or the context in which the voice signal was acquired. ... Cirrus Logic Inc

05/10/18 / #20180129796

Methods and apparatus for authentication in an electronic device

Embodiments of the invention provide methods and apparatus for monitoring the routing configuration within an electronic device such that a biometric authentication process can be carried out without interference from other components of the device, such as may occur when the device has become infected with malware for example. The invention may provide a codec or speaker recognition processor, coupled to receive biometric input data, comprising a security module that determines whether a routing configuration complies with one or more rules. ... Cirrus Logic Inc

05/10/18 / #20180127265

Package for mems device and process

The application describes a package design for a mems transducer having an integrated circuit mounted within a chamber of the package. The integrated circuit may extend into a side wall recess of the package.. ... Cirrus Logic Inc

05/03/18 / #20180124484

Enhancing audio performance of a consumer electronic device by producing compensation parameters based on the acoustic signature of the device

An integrated loudspeaker assembly along with associated methods and systems for enhancing audio output from a consumer electronic device including such an integrated loudspeaker assembly are disclosed. More particularly an integrated loudspeaker assembly configured to utilize the enclosure of an associated consumer electronic device for back volume is disclosed. ... Cirrus Logic Inc

05/03/18 / #20180123530

Amplifiers

This application relates to audio amplifier circuitry (100). An amplifier module (103) is located in a signal path between an input (101) and an output (102). ... Cirrus Logic Inc

05/03/18 / #20180122357

Ear interface detection

An ear interface mode of headphones may be determined by measuring an acoustic response of the headphones. For example, the headphones may be determined to be in a leaky or sealed configuration. ... Cirrus Logic Inc

05/03/18 / #20180120884

Variable ratio charge pump with peak current and average current limiting circuitry

A method of increasing a multiplication ratio of a charge pump, the multiplication ratio defining a relationship between an output voltage of the charge pump and an input voltage of the charge pump, comprising: analyzing a first efficiency of the charge pump when the multiplication ratio is at a first ratio, calculating a second efficiency of the charge pump when the multiplication ratio is a second ratio lesser than the first ratio, and based on the first efficiency and the second efficiency, determining at least one of a target output power and a target output voltage at which to change the multiplication ratio from the second ratio to the first ratio.. . ... Cirrus Logic Inc

04/19/18 / #20180109181

Charge pump input current limiter

A system may include a charge pump configured to operate in a plurality of modes including a first mode in which the ratio of an output voltage to an input voltage of the charge pump is a first ratio and a second mode in which the ratio is a second ratio and a controller configured to limit current flowing between a power source of the charge pump to the charge pump, wherein the power source provides the input voltage, by limiting a transfer of charge between the power source and the charge pump during a switching cycle of the charge pump responsive to a change in operation between modes of the plurality of modes.. . ... Cirrus Logic Inc

04/19/18 / #20180108341

Controlling an audio system

A method of controlling an audio system comprises: receiving an audio signal, and applying a first gain to the audio signal and outputting an amplified audio signal. On receiving a user input to increase the first gain applied to the audio signal, if the first gain is at a first threshold value, the method comprises: receiving an ambient noise signal, processing the ambient noise signal with a second gain value and outputting a noise cancellation signal, and changing the second gain value in response to the user input.. ... Cirrus Logic Inc

04/12/18 / #20180103329

Binaural hearing system and method

. . A system (202) for binaural signal processing. A first speaker (210) and a second speaker (220) are respectively mounted proximal to, and deliver respective first and second acoustic signals to, the left and right ears of a user. ... Cirrus Logic Inc

04/12/18 / #20180102136

Detection of acoustic impulse events in voice applications using a neural network

In accordance with embodiments of the present disclosure, an integrated circuit for implementing at least a portion of an audio device may include an audio output configured to reproduce audio information by generating an audio output signal for communication to at least one transducer of the audio device, a microphone input configured to receive an input signal indicative of ambient sound external to the audio device, and a processor configured to implement an impulsive noise detector. The impulsive noise detector may comprise a plurality of processing blocks for determining a feature vector based on characteristics of the input signal and a neural network for determining based on the feature vector whether the impulsive event comprises a speech event or a noise event.. ... Cirrus Logic Inc

04/12/18 / #20180102135

Detection of acoustic impulse events in voice applications

In accordance with embodiments of the present disclosure, an integrated circuit for implementing at least a portion of an audio device may include an audio output configured to reproduce audio information by generating an audio output signal for communication to at least one transducer of the audio device, a microphone input configured to receive an input signal indicative of ambient sound external to the audio device and a processor configured to implement an impulsive noise detector. The impulsive noise detector may include a sudden onset detector for predicting an occurrence of a signal burst event of the input signal and an impulsive detector for determining whether the signal burst event comprises a speech event or a noise event.. ... Cirrus Logic Inc

04/12/18 / #20180101495

Encoding for multi-device synchronization of devices

A distributed network system may include a shared communication bus that operates in accordance with a communication protocol and a plurality of devices coupled to the bus. In accordance with the communication protocol, when one or more of the plurality of devices is actively transmitting data on the bus, each of the plurality of devices receives data via the bus such that bidirectional communication is established among the plurality of devices via the bus, each of the plurality of devices monitors a bus state of the shared communication bus to avoid data contention and to synchronize receipt of encoded symbols and encoded messages comprising encoded symbols via the bus, and each actively transmitting device of the plurality of devices compares the bus state to a desired state of such actively transmitting device to determine a priority among actively transmitting devices of the plurality of devices with respect to the bus.. ... Cirrus Logic Inc

04/05/18 / #20180098152

Method and apparatus for acoustic crosstalk cancellation

A crosstalk canceller for reducing acoustic crosstalk at a time of audio playback is derived by forming a channel frequency response for a nominated playback geometry, and decomposing the channel frequency response to derive a decomposition element such as a singular value decomposition matrix. A value of the decomposition element, such as the smallest singular value, is then adjusted to reduce spectral coloration, and filter coefficients of a crosstalk cancellation filter are derived from the adjusted decomposition element.. ... Cirrus Logic Inc

04/05/18 / #20180098149

Adaptation of dynamic range enhancement based on noise floor of signal

An analog signal path portion of a signal path may have: (i) an audio input for receiving an analog signal, an audio output for providing an output signal, and a selectable analog gain, and may be configured to generate the output signal based on the analog signal and in conformity with the selectable analog gain; and (ii) a digital path portion having a selectable digital gain and configured to receive a digital input signal and convert the digital input signal into the analog signal in conformity with the selectable digital gain. A control circuit may be configured to modify the digital and analog gains in response to an indication to switch between gain modes of the signal path, determine a noise floor of an audio signal comprising the digital input signal or a signal derived therefrom, and control modification of the digital and analog gains based on the noise floor.. ... Cirrus Logic Inc

03/29/18 / #20180091911

Correction for speaker monitoring

. . Errors in measurements of a resistor to monitor current through a speaker may be corrected to improve the accuracy, performance, or quality of other signals affected by the measurement. Error may occur in the current measurement resulting from variations in measurements involving the resistor, such as errors based on the sense resistor's response to temperature or voltage differential. ... Cirrus Logic Inc

03/29/18 / #20180091102

Amplifier with configurable final output stage

An amplifier may include a first stage configured to receive an input signal at an amplifier input and generate an intermediate signal which is a function of the input signal, and a final output stage configured to generate an output signal which is a function of the intermediate signal at an amplifier output, and a signal feedback network coupled between the amplifier output and input. The final output stage may be switchable among a plurality of modes including at least a first mode in which the final output stage generates the output signal as a modulated output signal which is a function of the intermediate signal, and a second mode in which the final output stage generates the output signal as an unmodulated output signal which is a function of the intermediate signal. ... Cirrus Logic Inc

03/08/18 / #20180067715

Digital accessory interface calibration

A method of compensating for a round-trip transmission delay in an audio system comprising: a portable communications device; an audio accessory; and a cable, suitable for connecting the portable communications device and the audio accessory, having at least one wire and being detachable from at least one of the portable communications device and the audio accessory. At first times, a first synchronisation data pattern is transmitted on the at least one wire from said device to said accessory, wherein said first synchronisation data pattern comprises first signal level transitions on the at least one wire, synchronised to a master transmission clock. ... Cirrus Logic Inc

03/01/18 / #20180062593

Class-d amplifier circuits

Methods and apparatus for class-d amplifier circuits with improved power efficiency. The circuit has an output stage with at least first and second switches and a modulator that receives an input signal to be amplified, sin, and a first clock signal fsw. ... Cirrus Logic Inc

03/01/18 / #20180062583

Fully-differential operational amplifier system

A dynamic common reference input (cmri) signal may be provided to an operational amplifier, or “op-amp,” in an amplifier system to reduce the common mode ripple of the fully-differential op-amp, while adding little or no noise in the amplifier system. The dynamic cmri signal may be controlled such that a common-mode component of two amplifier input nodes of the operational amplifier is made approximately independent of two input signals received at two system input nodes of the amplifier system. ... Cirrus Logic Inc

02/22/18 / #20180050900

Mems device and process

The application describes a mems transducer comprising a layer of conductive material provided on a surface of a layer of membrane material. The layer of conductive material comprises first and second regions, wherein the thickness and/or the conductivity of the/each first and second regions is different.. ... Cirrus Logic Inc

02/15/18 / #20180048325

Multi-path analog front end with adaptive path

In accordance with embodiments of the present disclosure, a processing system may include a plurality of processing paths and a controller. The plurality of processing paths may include a static processing path configured to generate a first digital signal based on an analog input signal and a dynamic processing path configured to generate a second digital signal based on the analog input signal, wherein a parameter of the dynamic processing path is determined based on a characteristic of the analog input signal. ... Cirrus Logic Inc

02/15/18 / #20180048295

Adjustable time duration for driving pulse-width modulation (pwm) output to reduce thermal noise

Noise introduced in an output signal of a pulse-width modulator (pwm) may be reduced by changing the time duration that a switch is driving the output node. Because the power supplies coupled to the switches are the source of noise in the output signal of the pwm, the time duration that the power supplies are driving the output may be reduced to obtain a subsequent reduction in noise in the output signal. ... Cirrus Logic Inc

02/15/18 / #20180047412

Determining noise and sound power level differences between primary and reference channels

A method for estimating and minimizing a noise power level difference (npld) between a primary channel and a reference channel of an audio device, includes receiving, by a primary channel, an audio signal that has a speech signal level and a noise signal level; receiving, by a reference channel, the audio signal with another speech signal level and another noise signal level; using the reference channel to estimate the noise signal level in the primary channel by reducing the another speech signal level; and compensating for a difference between the noise signal level and the another noise signal level to minimize a noise power level difference npld between the primary channel and the reference channel.. . ... Cirrus Logic Inc

02/15/18 / #20180046239

Multi-path digitation based on input signal fidelity and output requirements

A system may include a plurality of processing paths and a controller. The processing paths may include a first processing path configured to generate a first digital signal based on an analog input signal and one or more other processing paths each configured to consume a smaller amount of power than the first processing path, and each configured to generate a respective digital signal based on the analog input signal, wherein one of the other processing paths has a noise floor based on fidelity characteristics of the analog input signal or subsequent processing requirements of a digital output signal generated from at least one of the first digital signal and the respective digital signals. ... Cirrus Logic Inc

02/15/18 / #20180044167

Mems device and process

The application describes improvements to (mems) transducers (100) having a flexible membrane (301) with a membrane electrode (302), especially where the membrane is crystalline or polycrystalline and the membrane electrode is metal or a metal alloy. Such transducers may typically include a back-plate having at least one back-plate layer (304) coupled to a back-plate electrode (303), with a plurality of holes (314) in the back-plate electrode corresponding to a plurality back-plate holes (312) through the back-plate. ... Cirrus Logic Inc

02/08/18 / #20180041833

Digital signal routing circuit

An integrated circuit for digital signal routing. The integrated circuit has analog and digital inputs and outputs, including digital interfaces for connection to other integrated circuits. ... Cirrus Logic Inc

02/08/18 / #20180041173

Configurable control loop topology for a pulse width modulation amplifier

In accordance with embodiments of the present disclosure, a system may have a configurable control loop technology, wherein the system comprises a first mode control loop, a second mode control loop and a reconfigurable pulse width modulator (pwm) configured to generate an output signal from an input signal. The reconfigurable pwm may include a digital pwm and an analog pwm and may be configured such that when the first mode control loop is activated, the reconfigurable pwm utilizes the analog pwm to generate the output signal from the input signal and when the second mode control loop is activated, the reconfigurable pwm utilizes the digital pwm to generate the output signal from the input signal and the digital pwm receives its input from a digital proportional integral derivative controller.. ... Cirrus Logic Inc

02/08/18 / #20180040325

Speaker recognition

This application describes methods and apparatus for generating a prompt to be presented to a user for the user to vocalise as part of speaker recognition. An apparatus according to an embodiment has a selector for selecting at least one vocal prompt element to form at least part of said prompt from a predetermined set of a plurality of vocal prompt elements. ... Cirrus Logic Inc

02/08/18 / #20180040323

Speaker recognition

This application describes methods and apparatus for speaker recognition. An apparatus according to an embodiment has an analyzer (202) for analyzing each frame of a sequence of frames of audio data (ain) which correspond to speech sounds uttered by a user to determine at least one characteristic of the speech sound of that frame. ... Cirrus Logic Inc

02/08/18 / #20180040315

Bandlimiting anti-noise in personal audio devices having adaptive noise cancellation (anc)

A personal audio device, such as a wireless telephone, includes noise canceling that adaptively generates an anti-noise signal from a reference microphone signal and injects the anti-noise signal into the speaker or other transducer output to cause cancellation of ambient audio sounds. An error microphone is provided proximate the speaker to measure the output of the transducer in order to control the adaptation of the anti-noise signal and to estimate an electro-acoustical path from the noise canceling circuit through the transducer. ... Cirrus Logic Inc

02/08/18 / #20180039769

Methods and apparatus for authentication in an electronic device

An electronic device, comprising one or more input devices, for receiving biometric input from a user and generating one or more biometric input signals; an applications processor; a mixer configurable by the applications processor to provide a first signal path between one or more of the input devices and the applications processor; and a biometric authentication module coupled to the one or more input devices via a second signal path that does not include the mixer, for performing authentication of at least one of the one or more biometric input signals.. . ... Cirrus Logic Inc

02/08/18 / #20180039768

Methods and apparatus for authentication in an electronic device

An authentication system, comprising: one or more inputs, for receiving biometric input signals from a user; a routing module, configured to selectively route the biometric input signals from the one or more inputs to one or more of a plurality of components, the plurality of components including a biometric authentication module, for processing the biometric input signals and generating an authentication result; and a security module, for receiving a control instruction for the routing module, determining whether or not the control instruction complies with one or more rules, and controlling the routing module based on the control instruction responsive to a determination that the control instruction complies with the one or more rules.. . ... Cirrus Logic Inc

02/08/18 / #20180039585

Communication protocol adapter

In accordance with embodiments of the present disclosure, an adapter for different types of devices that are defined by a full set of capabilities for a communication protocol may include one or more ports, wherein each of the one or more ports is configured to receive one of the different types of devices, and a device controller communicatively coupled to the one or more ports. The device controller may be configured to, when one of the different types of devices is received by the one or more ports obtain information related to a detection of the one of the different types of devices and, based on the information related to the detection, expose a subset of capabilities from the full set of capabilities to a bus of the communication protocol, wherein the subset of capabilities is defined by the one of the different types of devices for the communication protocol.. ... Cirrus Logic Inc

02/01/18 / #20180035229

Mems device and process

The application describes a mems transducer in which first and second conductive elements of a capacitor are both provided on the membrane. The membrane is shaped that the first and second conductive elements are displaced relative to each other when the flexible membrane deflects in response to a pressure differential across the membrane. ... Cirrus Logic Inc

02/01/18 / #20180035228

Mems device and process

The application describes mems transducers comprising a flexible membrane layer supported in a fixed relation relative to a substrate along at least one supporting edge, wherein a plurality of slits are provided through the membrane layer. The slits define a plurality of beams. ... Cirrus Logic Inc

02/01/18 / #20180035190

Mems device and process

This application relates to mems devices, especially mems capacitive transducers and to processes for forming such mems transducer that provide increased robustness and resilience to acoustic shock. The application describes a mems transducer (400) having at least one membrane layer (101) supported so as to define a flexible membrane. ... Cirrus Logic Inc

02/01/18 / #20180033422

Ambient noise reduction arrangements

A feedforward ambient noise reduction arrangement includes, within a housing, a loudspeaker device for directing sound energy into an ear of a listener. Disposed externally of the housing, and positioned to sense ambient noise on its way to the listener's ear, are plural microphone devices capable of converting the sensed ambient noise into electrical signals for application to the loudspeaker to generate an acoustic signal opposing the ambient noise. ... Cirrus Logic Inc

01/25/18 / #20180027330

Connectors for data transfer

Embodiments of the present disclosure relate to methods and apparatus for peripheral device discovery, the detection of orientation of a connector having multiple degrees of rotational symmetry, and the provision of appropriate signal paths between a host device and a peripheral device. Some embodiments provide a characteristic impedance within the peripheral device that is coupled between rotationally symmetric contacts of the connector and thus enables detection of the connector orientation. ... Cirrus Logic Inc

01/11/18 / #20180014121

Loudspeaker protection

This application describes methods and apparatus for loudspeaker protection. A loudspeaker protection system (100) is described having a first frequency band-splitter (102) for splitting an input audio signal (vin) into a plurality of audio signals (v1, v2 . ... Cirrus Logic Inc

01/11/18 / #20180014120

Loudspeaker protection

This application describes methods and apparatus for loudspeaker protection. A loudspeaker protection system (1100) is described having a first frequency band-splitter (102) for splitting an input audio signal (vin) into a plurality of audio signals (v1, v2 . ... Cirrus Logic Inc

01/04/18 / #20180007474

Mems devices and processes

A mems transducer structure comprises a substrate comprising a cavity. A membrane layer is supported relative to the substrate to provide a flexible membrane. ... Cirrus Logic Inc

01/04/18 / #20180007473

Mems device and process

The application describes mems transducers comprising a flexible membrane supported at a supporting edge relative to a substrate and further comprising one or more unbound edges. The shape of the unbound edge is selected so that the flexible membrane tends to bend along more than one bend axis in the region of the supporting edge.. ... Cirrus Logic Inc

01/04/18 / #20180005636

Microphone unit comprising integrated speech analysis

A microphone unit has a transducer, for generating an electrical audio signal from a received acoustic signal; a speech coder, for obtaining compressed speech data from the audio signal; and a digital output, for supplying digital signals representing said compressed speech data. The speech coder may be a lossy speech coder, and may contain a bank of filters with centre frequencies that are non-uniformly spaced, for example mel frequencies.. ... Cirrus Logic Inc

01/04/18 / #20180002168

Mems devices and processes

The application describes mems transducer having a flexible membrane and which seeks to alleviate and/or redistribute stresses within the membrane layer. A membrane having a first/active region and a second/inactive region is described.. ... Cirrus Logic Inc

01/04/18 / #20180002161

Mems device and process

The present application describes mems transducer having a membrane and a membrane electrode. The membrane and membrane electrode form a two-layer structure. ... Cirrus Logic Inc

01/04/18 / #20180002160

Mems device and process

The application describes mems transducer structures comprising a membrane structure having a flexible membrane layer and at least one electrode layer. The electrode layer is spaced from the flexible membrane layer such that at least one air volume extends between the material of the electrode layer and the membrane layer. ... Cirrus Logic Inc

01/04/18 / #20180002159

Mems devices and processes

The application describes mems transducer having a flexible membrane and which seeks to alleviate and/or redistribute stresses within the membrane layer. A membrane having a first/active region and a second/inactive region is described.. ... Cirrus Logic Inc

12/28/17 / #20170374474

Mems transducer package

A mems transducer package (1) is provide having a semiconductor die portion (3) with a thickness bounded by a first surface (9) and an opposite second surface (11). The package further has a transducer element (13) incorporated in the second surface (11) and a die back volume (7) that extends through the thickness of the semiconductor die portion (3) between the first surface (9) and the transducer element (13). ... Cirrus Logic Inc

12/28/17 / #20170374473

Mems transducer package

A method of fabricating a micro-electrical-mechanical system (mems) transducer chip scale package. The method comprising: providing (101) a front side pre-fabricated semiconductor die wafer (1) comprising a plurality of individual die that each comprise at least a mems transducer. ... Cirrus Logic Inc

12/28/17 / #20170374459

Optimization of performance and power in audio system

In accordance with embodiments of the present disclosure, a method for operating a playback path comprising a first dynamic range enhancement subsystem and a second dynamic range enhancement subsystem, wherein an audio signal generated by the first dynamic range enhancement subsystem is communicated to the second dynamic range enhancement subsystem, is provided. The method may include determining a first operating parameter of one of the first dynamic range enhancement subsystem and the second dynamic range enhancement subsystem that affects behavior of the other of the first dynamic range enhancement subsystem and the second dynamic range enhancement subsystem, communicating a control signal between the first dynamic range enhancement subsystem and the second dynamic range enhancement subsystem indicative of the first operating parameter, and setting a second operating parameter of the other of the first dynamic range enhancement subsystem and the second dynamic range enhancement subsystem in response to receipt of the control signal.. ... Cirrus Logic Inc

12/28/17 / #20170374457

Speaker protection based on output signal analysis

In accordance with embodiments of the present disclosure, a system may include a controller configured to be coupled to an audio speaker, wherein the controller receives an output signal indicative of a physical quantity associated with the audio speaker, compares the output signal to an audio input signal to determine if differences between the output signal and the audio input signal are present indicating at least one of distortion of the output signal, non-linearities of the audio speaker, and overexcursion of the audio speaker, and controls an audio signal communicated from the controller to the audio speaker and based on the audio input signal responsive to determining that differences between the output signal and the audio input signal are present indicating at least one of distortion of the output signal, non-linearities of the audio speaker, and overexcursion of the audio speaker.. . ... Cirrus Logic Inc

12/28/17 / #20170374456

Minimizing startup transients in an audio playback path

A method may be provided for powering up or down a playback path comprising a digital-to-analog converter (dac) for generating a non-ground-centered analog intermediate voltage centered at a common-mode voltage and coupled to a driver for generating a ground-centered playback path output voltage at an output of the driver wherein the output of the driver is clamped via a finite impedance to a ground voltage. The method may include transitioning continuously or in a plurality of discrete steps the analog intermediate voltage from an initial voltage to the common-mode voltage such that the transitioning is substantially inaudible at the output of the driver. ... Cirrus Logic Inc

12/28/17 / #20170374442

Mems transducer package

A mems transducer package (1) comprises a semiconductor die element (3) and a cap element (23). The semiconductor die element (3) and cap element (23) have mating surfaces (9, 21). ... Cirrus Logic Inc

12/28/17 / #20170374441

Mems transducer package

A mems transducer package (1) comprises a semiconductor die element (3) and a cap element (23). The semiconductor die element (3) and cap element (23) have mating surfaces (9, 21). ... Cirrus Logic Inc

12/28/17 / #20170373600

Multi-mode switching power converter

In accordance with embodiments of the present disclosure, a multi-mode switching power converter may include a power inductor, a first switch coupled between a first terminal of the power inductor and a first supply terminal having a first voltage, a second switch coupled between the first terminal of the power inductor and a second supply terminal having a second voltage, a full bridge comprising a plurality of switches and having an output for producing the output voltage comprising a first output terminal and a second output terminal, wherein a first input of the full bridge is coupled to a second terminal of the power inductor and a second input of the full bridge is coupled to one of the first supply terminal and the second supply terminal, and a capacitor coupled between the first output terminal and the second output terminal.. . ... Cirrus Logic Inc

12/28/17 / #20170372717

Digital volume control

A digital volume control may be implemented in a digital-to-analog controller (dac) when an output rate of the dac is higher than the input rate. The upsampling conversion process from the digital input to analog output may be controlled to adjust a volume of an output signal produced from the digital signals. ... Cirrus Logic Inc

12/28/17 / #20170371616

User input through transducer

Commands for modifying audio playback, such as to mute and unmute or pause and play audio, may be input to a mobile device by a user through interacting with the speaker in the device. The user input may be facilitated by monitoring a characteristic of the speaker and identifying signatures in the changing characteristics of the speaker that correspond with predetermined user activities. ... Cirrus Logic Inc

12/21/17 / #20170366898

Systems and methods for using a piezoelectric speaker as a microphone in a mobile device

In accordance with embodiments of the present disclosure, a device may include a piezoelectric speaker for generating sound, a microphone, and a controller communicatively coupled to the speaker and the microphone. The controller may be configured to receive a first signal from the piezoelectric speaker, the first signal induced at least in part by sound incident on the speaker other than sound generated by the piezoelectric speaker, receive a second signal from the microphone, the second signal induced by sound incident on the microphone, process at least one of the first signal and the second signal to determine at least one characteristic of sound incident upon at least one of the piezoelectric speaker and the microphone, and select at least one of the microphone and the piezoelectric speaker as a signal source for incident sound based on the at least one characteristic.. ... Cirrus Logic Inc

12/21/17 / #20170366895

Speaker system which comprises speaker driver groups

A speaker system (1, 1′, 1″) comprises a first speaker driver group (g1), comprising at least one first speaker driver (s1) and a first amplifier (a1), and a second speaker driver group (g2), comprising at least one second speaker driver (s2) and a second amplifier (a2). The speaker system further comprises a digital signal processor (2), adapted to provide a first signal to the first speaker driver group (g1) and a second signal to the second signal group (g2), wherein the first and second signals differ with respect to frequency range and at least one of the speaker driver groups comprises at least 4, 6, 8 or 10 speaker drivers.. ... Cirrus Logic Inc

12/14/17 / #20170359658

Mems device and process

A mems capacitive transducer with increased robustness and resilience to acoustic shock. The transducer structure includes a flexible membrane supported between a first volume and a second volume, and at least one variable vent structure in communication with at least one of the first and second volumes. ... Cirrus Logic Inc

12/14/17 / #20170359652

Method for limiting amplifier input current to avoid low voltage conditions

A predictive brownout prevention system may be configured to prevent brownout of an audio output signal. Particularly, the brownout prevention system may be configured to receive information indicative of an amplitude of the audio input signal, receive information indicative of a condition of the power supply, receive information indicative of one or more of the following: 1) adaptive estimates of power supply conditions; 2) anticipated effects of power supply capacitance; and 3) condition of a load impedance, determine from the received information whether a brownout condition exists, and responsive to determining the brownout condition exists, generate the selectable attenuation signal to reduce an amplitude of the audio output signal such that the signal path attenuates the audio input signal or a derivative thereof in order to prevent brownout prior to propagation to the audio output of a portion of the audio input signal having the brownout condition.. ... Cirrus Logic Inc

12/14/17 / #20170358294

Voice command triggered speech enhancement

Received data representing speech is stored, and a trigger detection block detects a presence of data representing a trigger phrase in the received data. In response, a first part of the stored data representing at least a part of the trigger phrase is supplied to an adaptive speech enhancement block, which is trained on the first part of the stored data to derive adapted parameters for the speech enhancement block. ... Cirrus Logic Inc

12/07/17 / #20170351487

Voice user interface

A received signal represents a user's speech. A first speaker recognition process is performed on a first portion of the received signal, to obtain a first output result. ... Cirrus Logic Inc

11/30/17 / #20170346501

Analogue-to-digital converter

This application relates to analogue-to-digital converters (adcs). An adc 200 has a first converter (201) for receiving an analogue input signal (ain) and outputting a time encode signal (dt), such as a pulse-width-modulated (pwm) signal, based on input signal and a first conversion gain setting (gin). ... Cirrus Logic Inc

11/30/17 / #20170346446

Multi-phase power converter system using multiple amplifier integrated circuits

In accordance with embodiments of the present disclosure, a system may include a circuit having a power converter and an amplifier, wherein the power converter is configured to generate an intermediate voltage, provide the intermediate voltage as an amplifier supply voltage to the amplifier, and share the intermediate voltage with one or more additional circuits external to the circuit, wherein at least one of the one or more additional circuits is configured to generate the intermediate voltage.. . ... Cirrus Logic Inc

11/30/17 / #20170346242

Monitoring of devices

This application relates to monitoring of electronic devices (100) and in particular to methods and apparatus for the detection and recording of an electrical overstress applied to a connector (101, 102) of the device. The apparatus describes an integrated circuit integrated circuit (103, 105, 106a) of the host device having a first set of one or more circuit contacts (201, 203, 204, 205) for connection to a connector (101) of a host electronic device. ... Cirrus Logic Inc

11/23/17 / #20170338126

Systems and methods for fabricating a polycrystaline semiconductor resistor on a semiconductor substrate

In accordance with embodiments of the present disclosure, an integrated circuit may include at least one region of shallow-trench isolation field oxide, at least one region of dummy diffusion, and a polycrystalline semiconductor resistor. The at least one region of shallow-trench isolation field oxide may be formed on a semiconductor substrate. ... Cirrus Logic Inc

11/16/17 / #20170332178

Mems process and device

A method of fabricating a micro-electrical-mechanical system (mems) transducer comprises the steps of forming a membrane on a substrate, and forming a back-volume in the substrate. The step of forming a back-volume in the substrate comprises the steps of forming a first back-volume portion and a second back-volume portion, the first back-volume portion being separated from the second back-volume portion by a step in a sidewall of the back-volume. ... Cirrus Logic Inc

11/09/17 / #20170325029

Audio enhancement

A signal processing module is configured to receive left and right channels of stereo input audio data and generate first and second channels of output audio data for first and second loudspeakers where the first and second loudspeakers have different frequency responses to one another. The signal processing module comprises an impulse emphasis block configured to emphasise impulsive sounds in the received audio in at least one of the first and second channels of output audio data.. ... Cirrus Logic Inc

11/09/17 / #20170325024

Speaker protection from overexcursion

In accordance with embodiments of the present disclosure, a controller configured to be coupled to an audio transducer, may be further configured to receive an audio input signal, calculate a displacement compensation signal in a displacement domain of the audio transducer based on the audio input signal, convert the displacement compensation signal from the displacement domain into a voltage compensation signal in a voltage domain, and apply the voltage compensation signal to the audio input signal, or a derivative thereof, to minimize overexcursion of the audio transducer.. . ... Cirrus Logic Inc

11/09/17 / #20170324325

Constant on time boost converter control

In accordance with embodiments of the present disclosure, a controller for controlling at least one switch of a switching converter may include a current estimator configured to determine an estimated inductor current through an inductor of the switching converter based on a previous sample of a current through the inductor and a switch control configured to control activation and deactivation of the at least one switch based on the estimated inductor current.. . ... Cirrus Logic Inc

11/09/17 / #20170322808

Low-power processor with support for multiple precision modes

Multiple data wordlengths may be supported by a processor through a single data path and/or a single set of registers. For example, the processor may support 16-bit wordlengths and 24-bit wordlengths through a single datapath. ... Cirrus Logic Inc

10/26/17 / #20170310315

Synchronous, internal clock edge alignment for integrated circuit testing

A synchronous clock edge alignment system and method increases detection coverage of transition delay faults that occur in logic circuits that have data released by a clock at an input of logic circuits internal to an integrated circuit and/or released at the output of the logic circuits when testing an integrated circuit. To increase detection coverage of inter-clock transition delay faults, in at least one embodiment, the synchronous clock edge alignment system and method align same transition type edges of internal data releasing clock signals, and at least two of the clock signals have different frequencies. ... Cirrus Logic Inc

10/26/17 / #20170310288

Systems and methods for predictive switching in audio amplifiers

An audio amplifier circuit for providing an output signal to an audio transducer may include a power amplifier and a control circuit. The power amplifier may include an audio input for receiving an audio input signal, an audio output for generating the output signal based on the audio input signal, and a power supply input for receiving a power supply voltage, wherein the power supply voltage is variable among at least a first supply voltage and a second supply voltage greater than the first supply voltage. ... Cirrus Logic Inc

10/26/17 / #20170310280

Single signal-variant power supply for a plurality of amplifiers

In accordance with embodiments of the present disclosure a control circuit may include at least one input for monitoring a respective signal for each of a plurality of amplifiers, an output for outputting at least one control signal for controlling a power supply level of the single signal-variant power supply configured to deliver electrical energy to the plurality of amplifiers, and decision and control logic. The decision and control logic may be configured to monitor the respective signals for each of the plurality of amplifiers and, based on the respective signals, and a respective requirement associated with each of the plurality of amplifiers, setting a power supply level of the single signal-variant power supply and outputting the at least one control signal to control the power supply level such that the respective requirements are satisfied.. ... Cirrus Logic Inc

10/12/17 / #20170295434

Packaging for mems transducers

This application describes methods and apparatus relating to packaging of mems transducers and to mems transducer packages. The application describes a mems transducer package (300) having a first integrated circuit die (200) which has an integrated mems transducer (202) and integrated electronic circuitry (203) for operation of the mems transducer. ... Cirrus Logic Inc

10/12/17 / #20170294512

Pinched doped well for a junction field effect transistor (jfet) isolated from the substrate

A jfet structure may be formed such that the channel region is isolated from the substrate to reduce parasitic capacitance. For example, instead of using a deep well as part of a gate structure for the jfet, the deep well may be used as an isolation region from the surrounding substrate. ... Cirrus Logic Inc

10/05/17 / #20170289678

Systems and methods for using a speaker as a microphone

In accordance with methods and systems of the present disclosure, a mobile device may include an enclosure adapted such that the enclosure is readily transported by a user of the mobile device, a speaker associated with the enclosure for generating sound, and a controller within the enclosure, communicatively coupled to the speaker. The controller may be configured to receive a signal from the speaker, the signal induced at least in part by sound incident on the speaker other than sound generated by the speaker and process the signal.. ... Cirrus Logic Inc

10/05/17 / #20170288619

Dc offset compensation

An apparatus and method for dc offset compensation. An amplifier receives an input signal (ain) and provides an amplified output signal (sout) and a feedback path provides dc offset compensation. ... Cirrus Logic Inc

10/05/17 / #20170288534

Charge pump circuit

A bipolar output charge pump circuit having a network of switching paths for selectively connecting an input node and a reference node for connection to an input voltage, a first pair of output nodes, two pairs of flying capacitor nodes, and a controller for controlling the switching of the network of switching paths. The controller is operable to control the network of switching paths when in use with two flying capacitors connected to the two pairs of flying capacitor nodes, to provide a first mode and a second mode when in use with two flying capacitors connected to the flying capacitor nodes, wherein at least the first mode corresponds to a bipolar output voltage of +/−3 vv, +/−vv/5 or +/−vv/6.. ... Cirrus Logic Inc

10/05/17 / #20170284825

Signal processing for mems capacitive transducers

This application relates to circuitry for processing sense signals generated by mems capacitive transducers for compensating for distortion in such sense signals. The circuitry has a signal path between an input (204) for receiving the sense signal and an output (205) for outputting an output signal based on said sense signal. ... Cirrus Logic Inc

09/28/17 / #20170280240

Systems and methods for loudspeaker electrical identification with truncated non-causality

In accordance with embodiments of the present disclosure, a method may include using an adaptive filter system to estimate a response of an electrical characteristic of a loudspeaker based on an error between a first electrical parameter of the loudspeaker and a second electrical parameter of the loudspeaker and adding a non-zero delay to the first electrical parameter relative to the second electrical parameter prior to calculation of the error such that the adaptive filter system captures a truncated non-causality of the electrical characteristic.. . ... Cirrus Logic Inc

09/21/17 / #20170272044

Removal of switching discontinuity in a hybrid switched mode amplifier

A signal processing system for producing a load voltage at a load output of the signal processing system, wherein the load output comprises a first load terminal having a first load voltage and a second load terminal having a second load voltage such that the load voltage comprises a difference between the first load voltage and the second load voltage, and may include a first processing path configured to process a first signal derived from an input signal to generate the first load voltage at a first processing path output, a second processing path configured to process a second signal received at a second processing path input and derived from the input signal, wherein the second signal comprises information of the input signal absent from the first signal, to generate the second load voltage at a second processing path output, and a high-pass filter coupled between the first processing path output and the second processing path input.. . ... Cirrus Logic Inc

09/21/17 / #20170272043

Generation of voltage reference signals in a hybrid switched mode amplifier

A method may include processing a first signal derived from an input signal with a first path to generate a first path voltage at a first path output, processing a second signal derived from the input signal with a second path to generate a second path voltage at a second path output, the second path comprising a linear amplifier having at least one transistor for driving the second path voltage, generating the first signal and the second signal with a signal splitter, such that the second signal comprises information of the input signal absent from the first signal, and such that the second path voltage is of a sufficient magnitude such that the at least one transistor operates in a saturation region of the at least one transistor throughout a dynamic range of a load voltage equal to the difference of the first path voltage and the second path voltage.. . ... Cirrus Logic Inc

09/21/17 / #20170272042

Dual device semiconductor structures with shared drain

Transistors may be manufactured with a shared drain to reduce die area consumed by circuitry. In one example, two transistors can be manufactured that include two body regions that abut a shared drain region. ... Cirrus Logic Inc

09/21/17 / #20170271996

Prevention of switching discontinuity in a hybrid switched mode amplifier

A method may include controlling switches of a switching full-bridge of a signal processing system to commutate polarity of a capacitor with respect to the first processing path output and a second processing path output of the signal processing system in response to a condition for commutating connectivity of the switching full-bridge and inserting a feedforward compensation that bypasses a loop filter of the second processing path in order to prevent discontinuities caused by commutating polarity of the capacitor from being compensated by the loop filter.. . ... Cirrus Logic Inc

09/21/17 / #20170270920

Speech recognition

A speech recognition system comprises: an input, for receiving an input signal from at least one microphone; a first buffer, for storing the input signal; a noise reduction block, for receiving the input signal and generating a noise reduced input signal; a speech recognition engine, for receiving either the input signal output from the first buffer or the noise reduced input signal from the noise reduction block; and a selection circuit for directing either the input signal output from the first buffer or the noise reduced input signal from the noise reduction block to the speech recognition engine.. . ... Cirrus Logic Inc

09/21/17 / #20170270906

Systems and methods for adaptive active noise cancellation for multiple-driver personal audio device

In accordance with embodiments of the present disclosure, a processing circuit may implement an adaptive filter, a first signal injection portion which injects a first additional signal into a first frequency range content source audio signal, and a second signal injection portion which injects a second additional signal into a second frequency range content source audio signal, wherein the first additional signal and the second additional signal are substantially different. The adaptive filter may have a response that generates the antinoise signal from the reference microphone signal to reduce the presence of the ambient audio sounds at the acoustic output, wherein the response of the adaptive filter is shaped in conformity with the reference microphone signal and the error microphone signal by adapting the response of the adaptive filter to minimize the ambient audio sounds in the error microphone signal, wherein the antinoise signal is combined with at least the first frequency range content source audio signal.. ... Cirrus Logic Inc

09/14/17 / #20170260044

Mems devices and processes

This application relates to mems transducer having a membrane layer (101) and at least one variable vent structure (301). The variable vent structure has a vent hole for venting fluid so as to reduce a pressure differential across the membrane layer and a moveable vent cover (302a, 302b) which, at an equilibrium position, at least partly blocks the vent hole. ... Cirrus Logic Inc

09/07/17 / #20170257725

Method and apparatus for acoustic crosstalk cancellation

An acoustic crosstalk canceller is determined for an asymmetric audio playback device, by determining a transfer function of an acoustic stereo playback path having asymmetries defined by speakers of the playback device. The transfer function is inverted to determine an inverse transfer function. ... Cirrus Logic Inc

09/07/17 / #20170256248

Systems and methods for controlling adaptive noise control gain

A method may include adaptively generating an anti-noise signal for countering the effects of ambient audio sounds at an acoustic output of the transducer by adapting a response of an adaptive filter that filters a reference microphone signal in conformity with an error microphone signal and the reference microphone signal to minimize the ambient audio sounds in the error microphone, generating a scaled anti-noise signal by applying a scaling factor to the anti-noise signal, further adjusting the response of the adaptive filter independent of a source audio signal by altering an input to the coefficient control block of the adaptive filter to compensate for the scaling factor, and combining the scaled anti-noise signal with the source audio signal to generate an audio signal provided to the transducer.. . ... Cirrus Logic Inc

08/31/17 / #20170251317

Apparatus and method for measuring relative frequency response of audio device microphones

Test apparatus measuring relative frequency response of first and second microphones includes a rotatable carrier. First and second microphones are sealingly clamped against a mounting surface of the carrier aligned with first and second apertures therein, such apertures lying equidistant from, and on opposite sides of, the carrier's axis of rotation. ... Cirrus Logic Inc

08/31/17 / #20170251303

Digital microphones

This application relates to methods and apparatus for digital microphones. Disclosed is a digital microphone apparatus (300) for outputting a digital output signal (data) at a sample rate defined by a received clock signal (clk). ... Cirrus Logic Inc

08/31/17 / #20170251302

Digital microphones

This application relates to methods and apparatus for digital microphones. Disclosed is a digital microphone apparatus (300) for outputting a digital output signal (data) at a sample rate defined by a received clock signal (clk). ... Cirrus Logic Inc








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