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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.

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 new patent  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

 new patent  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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

08/24/17 / #20170245052

Microphone biasing circuitry and method thereof

A host device for use with a removable peripheral apparatus having a microphone, and to the biasing circuitry for said microphone. The host device may have a device connector for forming a mating connection with a respective peripheral connector. A source of bias is arranged to supply an electrical bias... Cirrus Logic International Semiconductor Ltd

Patent Packs
08/24/17 / #20170245071

Direct current (dc) and/or alternating current (ac) load detection for audio codec

A portable audio device may be configured to measure load characteristics of headphones. The device may measure direct current (DC) and/or alternating current (AC) characteristics of the load. These characteristics may be measured by an audio component, such as an audio codec chip or integrated circuit (IC) controller, and reported... Cirrus Logic International Semiconductor Ltd

08/24/17 / #20170245072

Identification of a load with a search algorithm that controls application of signals to the load and a reference generator

An electronic device may be configured to identify a load coupled to the device. The device may measure direct current (DC) and/or alternating current (AC) characteristics of the load to identify the load. The device may then take action based on the identification of the load. For example, a specific... Cirrus Logic International Semiconductor Ltd

08/24/17 / #20170245073

Temperature compensation for load identification

An electronic device may be configured to identify a load coupled to the device. The device may measure direct current (DC) and/or alternating current (AC) impedances of the load to identify the load. The device may then take action based on the identification of the load. For example, a specific... Cirrus Logic International Semiconductor Ltd

08/03/17 / #20170217757

Integrated mems transducer and circuitry

This application relates to an integrated circuit die (200) comprising a MEMS transducer structure (101) integrated with associated electronic circuitry (102). The electronic circuitry comprises a plurality of transistors and associated interconnections and is formed in a first area (103) of the die from a first plurality (104) of layers,... Cirrus Logic International Semiconductor Ltd

08/03/17 / #20170217760

Mems device and process

The application describes MEMS transducers and associated methods of fabrication. The MEMS transducer has a flexible membrane with a vent structure comprising a moveable portion which opens in response to a differential pressure across the membrane to provide a flow path through the membrane. At least one edge of the... Cirrus Logic International Semiconductor Ltd

08/03/17 / #20170217761

Mems device and process

The application describes MEMS transducers having a vent structure provided in a flexible membrane of the vent structure The vent structure comprises at least one moveable portion and the vent structure is configured such that, in response to a differential pressure across the vent structure, the moveable portion is rotatable... Cirrus Logic International Semiconductor Ltd

08/03/17 / #20170217762

Integrated mems transducers

A MEMS transducer package (300) comprises a package cover (313) comprising a first bonding region (316) and an integrated circuit die (319) comprising a second bonding region (314) for bonding with the first bonding region of the package cover. The integrated circuit die (309) comprises an integrated MEMS transducer (311)... Cirrus Logic International Semiconductor Ltd

08/03/17 / #20170221490

Wireless cellular telephone with audio codec

A wireless cellular telephone with an audio codec for converting digital audio signals to analog audio signals. The audio codec comprises two digital audio bus interfaces for coupling to respective digital audio buses, and a digital-only signal path between the two digital audio bus interfaces, such that no analog processing... Cirrus Logic International Semiconductor Ltd

08/03/17 / #20170223466

Stress decoupling in mems transducers

A MEMS transducer (200) comprises a substrate (101) having a first surface (102) and a membrane (103) formed relative to an aperture in the substrate. The MEMS transducer (200) further comprises one or more bonding structures (107) coupled to the substrate, wherein the one or more bonding structures (107), during... Cirrus Logic International Semiconductor Ltd

07/27/17 / #20170212721

Systems and methods for reducing audio artifacts from switching between paths of a multi-path signal processing system

A processing path may include a controller and a plurality of processing paths including a first processing path and a second processing path. The first path may be configured to generate a first digital signal based on an analog input signal and the second path may be configured to generate... Cirrus Logic International Semiconductor Ltd

07/27/17 / #20170213537

Noise cancellation system with lower rate emulation

A noise cancellation system, comprising: an input for a digital signal, the digital signal having a first sample rate; a digital filter, connected to the input to receive the digital signal; a decimator, connected to the input to receive the digital signal and to generate a decimated signal at a... Cirrus Logic International Semiconductor Ltd

07/27/17 / #20170213538

Noise cancellation system with lower rate emulation

A noise cancellation system, comprising: an input for a digital signal, the digital signal having a first sample rate; a digital filter, connected to the input to receive the digital signal; a decimator, connected to the input to receive the digital signal and to generate a decimated signal at a... Cirrus Logic International Semiconductor Ltd

07/27/17 / #20170213539

Noise cancellation system with lower rate emulation

A noise cancellation system, comprising: an input for a digital signal, the digital signal having a first sample rate; a digital filter, connected to the input to receive the digital signal; a decimator, connected to the input to receive the digital signal and to generate a decimated signal at a... Cirrus Logic International Semiconductor Ltd

07/27/17 / #20170214997

Dynamic frequency-dependent sidetone generation

The overall performance and power utilization of an audio device may be improved with an adaptive sidetone generation system that generates sidetones optimized for different application-specific problems. In particular, systems that include sidetone generation capabilities may be developed to include numerous microphones from which information may be received and processed... Cirrus Logic International Semiconductor Ltd

07/20/17 / #20170207755

Switched mode converter with variable common mode voltage buffer

A switching power stage for producing a load voltage at a load output of the switching power stage, 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

Patent Packs
07/20/17 / #20170207759

Hybrid switched mode amplifier

A switching power stage for producing a load voltage may include a first processing path having a first output, a second processing path having a second output, a first plurality of switches comprising at least a first switch coupled between the first output and a first load terminal and a... Cirrus Logic International Semiconductor Ltd

07/20/17 / #20170208407

Method and 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. The first and second signals reflect a common acoustic input, and are either temporally distinct or spatially distinct, or both. The first signal is processed... Cirrus Logic International Semiconductor Ltd

07/13/17 / #20170201835

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

07/06/17 / #20170194926

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). An error block (205), which may comprise an ADC (207),... Cirrus Logic International Semiconductor Ltd

06/29/17 / #20170187383

Phase locked loops

This application relates to methods and apparatus for phase locked loops. A phase-and-frequency detector (101) receives a reference clock signal (CKref) and a feedback signal (SFB) and outputs a first adjustment signal (U) that is modulated between respective first and second signal levels to provide control pulses indicating that an... Cirrus Logic International Semiconductor Ltd

06/29/17 / #20170188149

Multi-path analog front end and analog-to-digital converter for a signal processing system with low-pass filter between paths

In accordance with embodiments of the present disclosure, a processing system comprising may include a plurality of processing paths and a filter. The plurality of processing paths may include a first processing path and a second processing path, wherein the first processing path is configured to generate a first digital... Cirrus Logic International Semiconductor Ltd

06/22/17 / #20170180853

Systems and methods for restoring microelectromechanical system transducer operation following plosive event

A system may include control circuitry for detecting a plosive event associated with a microphone transducer and in response to the plosive event, causing restoration of acoustic sense operation of the microphone transducer and a processing circuit associated with the microphone transducer. A system for configuring a filter having at... Cirrus Logic International Semiconductor Ltd

06/22/17 / #20170180856

Systems and methods of configuring a filter having at least two frequency response configurations

A system may include control circuitry for detecting a plosive event associated with a microphone transducer and in response to the plosive event, causing restoration of acoustic sense operation of the microphone transducer and a processing circuit associated with the microphone transducer. A system for configuring a filter having at... Cirrus Logic International Semiconductor Ltd

06/22/17 / #20170180858

Digital correcting network for microelectromechanical systems microphone

In accordance with embodiments of the present disclosure, a system may include a digital correcting network for correcting for an intrinsic highpass filter of a microelectromechanical systems (MEMS) microphone such that a combined phase and magnitude response of a cascade of the intrinsic highpass filter and the digital correcting network... Cirrus Logic International Semiconductor Ltd

06/22/17 / #20170180859

Crosstalk mitigation

This application describes methods and apparatus for mitigating the effects of crosstalk in multichannel audio. An audio driver circuit (200) for driving first and second audio loads (103) having a common return path (RC), has first and second signal paths (Left and Right). A crosstalk compensation block (205) is configured... Cirrus Logic International Semiconductor Ltd

06/08/17 / #20170160337

Apparatus and testing a capacitive transducer and/or associated electronic circuitry

A method of testing a capacitive transducer circuit, for example a MEMS capacitive transducer, by applying a test signal via one or more capacitors provided in the transducer circuit.... Cirrus Logic International Semiconductor Ltd

06/08/17 / #20170163252

Systems and methods for implementing hysteresis in a comparator

In accordance with embodiments of the present disclosure, a comparator may include a transconductance stage having an input configured to receive an input voltage and generate an intermediate current responsive to the input voltage, a hysteretic current source configured to generate a hysteretic current, an output stage configured to generate... Cirrus Logic International Semiconductor Ltd

06/08/17 / #20170164094

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... Cirrus Logic International Semiconductor Ltd

06/01/17 / #20170153347

Accessory detection

This application relates to methods and apparatus for detecting the presence of an accessory device (102) connected to a host device (10) via suitable connector (104), for instance a jack socket (104) of the host device for receiving a jack plug (103) of the accessory device. The apparatus (106) includes... Cirrus Logic International Semiconductor Ltd

05/25/17 / #20170150257

Systems and methods for preventing distortion due to supply-based modulation index changes in an audio playback system

In accordance with embodiments of the present disclosure, a method may include receiving a digital input signal at a first integrated circuit from a second integrated circuit, receiving a supply voltage at the first integrated circuit from the second integrated circuit, generating an analog output signal from the digital input... Cirrus Logic International Semiconductor Ltd

05/25/17 / #20170150283

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).... Cirrus Logic International Semiconductor Ltd

05/18/17 / #20170138990

Current sense amplifier with common mode rejection

The overall performance of a current sense amplifier system may be improved by increasing the common mode rejection of the system. In particular, improved current sense amplifier systems of this disclosure may be configured to use a first ADC path to measure a current flowing through a device, a second... Cirrus Logic International Semiconductor Ltd

05/18/17 / #20170141603

Multiple input/multiple output switching converter

In accordance with embodiments of the present disclosure, an apparatus may include a power converter having a power supply input for receiving an input power supply voltage generated by a power supply, an output for generating an output voltage to a load, and a power inductor coupled between the power... Cirrus Logic International Semiconductor Ltd

05/18/17 / #20170141675

Enabling very large and very small duty cycles in switching converters

In accordance with embodiments of the present disclosure, an apparatus may include a switched-mode power supply and a controller. The switched-mode power supply may include an inductor and a plurality of switches coupled to the inductor. The controller may be configured to control an inductor current of the inductor by... Cirrus Logic International Semiconductor Ltd

05/18/17 / #20170141732

Current sense amplifier with enhanced common mode input range

The overall performance of a current sense amplifier system may be improved by increasing the common mode rejection of the system. In particular, improved current sense amplifiers may be configured to use a first signal path coupled to the amplifier and a first input terminal, wherein the first signal path... Cirrus Logic International Semiconductor Ltd

05/18/17 / #20170142518

Prevention of signal clipping due to decrease in amplifier supply voltage

A method may include receiving information indicative of an amplitude of an audio output signal, receiving information indicative of a predicted voltage of a power supply of a signal path having an audio input for receiving an audio input signal and an audio output for generating the audio output signal... Cirrus Logic International Semiconductor Ltd

05/18/17 / #20170142519

Digital microphones

This application relates to methods and apparatus for relates to methods and apparatus for operating digital microphones, and in particular to biasing of digital microphones. The application discloses a circuit (402) for providing a bias current (Ibias) for a digital microphone (401). A first current generator (403) is configured to... Cirrus Logic International Semiconductor Ltd








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