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Cirrus Logic International Semiconductor Ltd patents


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

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "C" | Cirrus Logic International Semiconductor Ltd-related inventors


 new patent  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. The controller is configured to accept one or more input signals, and one or more estimated states produced... Cirrus Logic International Semiconductor Ltd

 new patent  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. The system... Cirrus Logic International Semiconductor Ltd

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 International Semiconductor Ltd

Methods and 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... Cirrus Logic International Semiconductor Ltd

Methods and 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... Cirrus Logic International Semiconductor Ltd

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. The system is configured to drive one or more... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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. An adaptive noise cancellation (ANC) system may be controlled based on the determined ear interface mode of the... Cirrus Logic International Semiconductor Ltd

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). A detection module (106) is configured to detect a characteristic of a load (104) electrically coupled, in use, to the output. A distortion setting... Cirrus Logic International Semiconductor Ltd

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. Methods... Cirrus Logic International Semiconductor Ltd

Efficient boost converter

In accordance with embodiments of the present disclosure, a system may include a series combination of a boost converter and a power converter coupled together in series, such that the series combination boosts an input voltage to the series combination to an output voltage greater than the input voltage such... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

Digital accessory interface

transferring control data, wherein the format of the frame is such that, irrespective of whether the control data is transferred in the first direction or in the second direction, there is only one pair of reversals of a direction of data transfer in each frame.... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

Method and 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,... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

Mems device and process

a substrate; a primary membrane supported in a fixed relation relative to the substrate and a secondary membrane provided in a plane overlying the primary membrane. The secondary membrane is mechanically coupled to the primary membrane by a substantially rigid coupling structure. A rigid support plate may be interposed between... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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. The modulator controls the duty cycles of the... Cirrus Logic International Semiconductor Ltd

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 International Semiconductor Ltd

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)... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

Methods and 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... Cirrus Logic International Semiconductor Ltd

Methods and 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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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. Inputs, including the digital interfaces, act as data sources. Outputs, including the digital interfaces, act as data destinations. The integrated circuit also includes signal... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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. A... Cirrus Logic International Semiconductor Ltd

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. Each beam defines a path between first... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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 . . . ,vn) in different respective frequency bands (ω1, ω2 . .... Cirrus Logic International Semiconductor Ltd

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 . . . , vn) in different respective frequency bands (ω1, ω2 .... Cirrus Logic International Semiconductor Ltd

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 International Semiconductor Ltd

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 International Semiconductor Ltd

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. The membrane electrode is in the form of a lattice of conductive material. The pitch of the lattice and/or the size of the openings varies from a central... Cirrus Logic International Semiconductor Ltd

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 International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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. A peripheral edge of the cavity defines at least one perimeter region that is convex with reference to the center of the cavity. The peripheral edge... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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). The semiconductor die element (3) and cap element (23) are configured such that when the semiconductor die element (3) and... Cirrus Logic International Semiconductor Ltd

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). The semiconductor die element (3) and cap element (23) are configured such that when the semiconductor die element (3) and... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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,... Cirrus Logic International Semiconductor Ltd

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. And back etching (104) the semiconductor die wafer (1) at the... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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,... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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. The variable vent... Cirrus Logic International Semiconductor Ltd

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. A second speaker recognition process is performed on a second portion of the received signal that is different from the first portion... Cirrus Logic International Semiconductor Ltd

Patent Packs
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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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). In some embodiments the... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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. For supported data wordlengths that are less than the wordlength of the registers and datapath,... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

11/02/17 / #20170317580

Peak current limiting in inductor-based power converter

A combination of inductor current thresholds and circuitry for controlling the inductor based on the thresholds may be implemented in a power converter. One or more of the inductor current thresholds may be variable. An inductor current threshold may be varied as part of a search algorithm for identifying a... Cirrus Logic International Semiconductor Ltd

11/02/17 / #20170318388

Control and protection of loudspeakers

A nonlinear control system and a loudspeaker protection system. In particular, a nonlinear control system including a controller, an audio system, and a model is disclosed. The controller is configured to accept one or more input signals, and one or more estimated states produced by the model to produce one... Cirrus Logic International Semiconductor Ltd

11/02/17 / #20170318389

Audio signals

Embodiments of the invention provide methods and apparatus for processing audio input signals, for example, so as to linearize the output of a given loudspeaker. An audio processor is provided, for modifying an audio signal to be provided to a loudspeaker, the audio processor comprising: a first filter stage, for... Cirrus Logic International Semiconductor Ltd

11/02/17 / #20170318390

Audio signals

Embodiments of the invention provide methods and apparatus for measuring and characterizing a loudspeaker. In particular, the non-linear response of the loudspeaker can be determined. Embodiments of the invention also provide methods and apparatus for processing audio input signals, for example, so as to linearize the output of a given... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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,... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

Patent Packs
10/19/17 / #20170300290

Mixing of single-bit and multi-bit audio signals for simultaneous output

An audio processor may process dissimilarly formatted digital audio signals and produce an analog output for reproduction by a transducer, such as a speaker. The audio processor may be, for example, a digital-to-analog converter (DAC) with multiple digital inputs and a single analog output. The audio processor may also include... Cirrus Logic International Semiconductor Ltd

10/19/17 / #20170301360

Magntiude compensation technique for processing single-bit wide data

Droop caused by a filter may be compensated by applying a pre-filter to the audio signal that cancels out, at least in part, the droop caused by the filter. The pre-filter may implement magnitude compensation that causes an approximately flat passband response when the pre-filtered signal is passed through the... Cirrus Logic International Semiconductor Ltd

10/19/17 / #20170303032

Over-sampling digital processing path that emulates nyquist rate (non-oversampling) audio conversion

The behavior of a NOS DAC and an analog filter may be emulated by electronic components of an integrated circuit (IC) by upsampling data and applying a digital filter to the upsampled data. For example, the IC may include a zero-order-hold circuit that upsamples data from a first input sample... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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 International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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. The feedback path comprises at least one voltage controlled oscillator (VCO) and a counter. The VCO provides, over time, a... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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. The two transistors can be independently operated by coupling terminals to a source and a gate... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

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... Cirrus Logic International Semiconductor Ltd

09/07/17 / #20170257725

Method and 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. The inverse transfer function is regularised by... Cirrus Logic International Semiconductor Ltd

08/31/17 / #20170247248

Integrated mems transducer and circuitry

The application relates to integrated MEMS transducers comprising a MEMS transducer structure formed of a plurality of transducer layers and at least one circuit component formed from a plurality of circuitry (CMOS) layers. The integrated MEMS transducer further comprises a conductive enclosure that is integral to the transducer layers and... Cirrus Logic International Semiconductor Ltd

08/31/17 / #20170250600

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 and a second pair of output nodes, and two pairs of flying capacitor nodes, and a... Cirrus Logic International Semiconductor Ltd

08/31/17 / #20170250601

Amplifier circuit and methods of operation thereof

A signal amplifying circuit and associated methods and apparatuses, the circuit comprising: a signal path extending from an input terminal to an output terminal, a gain controller arranged to control the gain applied along the signal path in response to a control signal; an output stage within the signal path... Cirrus Logic International Semiconductor Ltd

08/31/17 / #20170251294

Clamping audio signal paths

This application describes methods and apparatus for selectively clamping a signal path (106) for an analogue audio signal to a clamp voltage, e.g. ground. Voltage clamping circuitry (200) is disclosed having a first switching device (201) in series with a second switching device (202) between a node of the signal... Cirrus Logic International Semiconductor Ltd

08/31/17 / #20170251299

Microphone mixing for wind noise reduction

Wind noise reduction in microphone signals. A first microphone signal is obtained from a first omnidirectional microphone and, contemporaneously, a second microphone signal is obtained from a second omnidirectional microphone. The first and second microphone signals are mixed to produce an output signal. Mixing involves weighting the first and second... Cirrus Logic International Semiconductor Ltd

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). The apparatus includes a band splitter (302) configured to receive a microphone signal (SMD) indicative... Cirrus Logic International Semiconductor Ltd

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). The apparatus includes a band splitter (302) configured to receive a microphone signal (SMD) indicative... Cirrus Logic International Semiconductor Ltd








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