公开(公告)号：US10297267B2

公开(公告)日：2019-05-21

申请号：US15595168

申请日：2017-05-15

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Samuel P. Ebenezer ,  Rachid Kerkoud

IPC: H04R3/00 ,  G10L21/0264 ,  H04R1/40 ,  G10L19/005 ,  G10L21/0208 ,  H04R1/10 ,  G10L25/78 ,  G10L21/0216

Abstract: In accordance with embodiments of the present disclosure, a method for voice processing in an audio device having an array of a plurality of microphones wherein the array is capable of having a plurality of positional orientations relative to a user of the array, is provided. The method may include periodically computing a plurality of normalized cross-correlation functions, each cross-correlation function corresponding to a possible orientation of the array with respect to a desired source of speech, determining an orientation of the array relative to the desired source based on the plurality of normalized cross-correlation functions, detecting changes in the orientation based on the plurality of normalized cross-correlation functions, and responsive to a change in the orientation, dynamically modifying voice processing parameters of the audio device such that speech from the desired source is preserved while reducing interfering sounds.

公开(公告)号：US10276145B2

公开(公告)日：2019-04-30

申请号：US15495714

申请日：2017-04-24

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Dayong Zhou ,  Yang Lu

IPC: G10K11/16 ,  A61F11/06 ,  G10K11/178 ,  H04W88/02

Abstract: The handling of disturbances to audio signals may be improved with an adaptive noise cancellation (ANC) system that performs frequency-domain adaption. The ANC systems may be configured to determine if a disturbance is present at a first frequency in the second input signal received from the reference microphone. The ANC systems may update an algorithm of an adaptive filter based, at least in part, on the first input signal, the second input signal, and a feedback signal that is based on an output of the adaptive filter by changing parameters of the algorithm such that the adaptive filter adapts around the first frequency differently than other frequencies when the disturbance is present.

公开(公告)号：US10269370B2

公开(公告)日：2019-04-23

申请号：US15934182

申请日：2018-03-23

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Zhengyi Xu

IPC: G10L21/0388 ,  G10L21/0216 ,  G10L21/0232 ,  H04R3/00

Abstract: 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. A second adaptive filter receives the error signal, and an output calculation block subtracts an output of the second adaptive filter from the first input signal to generate an output signal. The adaptation of first and second adaptive filters is controlled based on a magnitude coherence between the first and second input signals.

公开(公告)号：US10257612B2

公开(公告)日：2019-04-09

申请号：US15439401

申请日：2017-02-22

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： John Paul Lesso ,  John Laurence Melanson

IPC: H04R3/00 ,  H04R3/06 ,  H04R19/00 ,  H04R19/04

Abstract: 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 of an output of a microphone transducer and split said microphone signal into first signal path (SP1) for frequencies in a first band and a second signal path (SP2) for frequencies in a second band, the frequencies of the second band being higher than the frequencies in the first band. A modulation block (304) is configured to operate on the second signal path to down-convert signals in the second signal path from the second frequency band to a lower frequency band.

公开(公告)号：US10252906B2

公开(公告)日：2019-04-09

申请号：US15788499

申请日：2017-10-19

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Roberto Brioschi ,  David Patten ,  Rkia Achehboune

IPC: H01L29/84 ,  B81B7/00 ,  B81B3/00

Abstract: 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.

公开(公告)号：US10242696B2

公开(公告)日：2019-03-26

申请号：US15290685

申请日：2016-10-11

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Samuel Pon Varma Ebenezer

IPC: G10L21/02 ,  G10L25/84 ,  G10L21/0216 ,  G10L21/0232

Abstract: 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.

公开(公告)号：US10225652B2

公开(公告)日：2019-03-05

申请号：US15488872

申请日：2017-04-17

Applicant: Cirrus Logic, Inc.

Inventor： John L. Melanson ,  Eric Swanson

IPC: H04R23/00 ,  H04R3/00 ,  H04R1/04 ,  H04W52/02 ,  H04R1/10 ,  H04R3/04 ,  H04R19/02 ,  H04R19/04

Abstract: 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.

公开(公告)号：US10219074B2

公开(公告)日：2019-02-26

申请号：US15878659

申请日：2018-01-24

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Roberto Napoli ,  Stefan Williams

IPC: H03G11/00 ,  H04R3/00 ,  H03G3/30 ,  H04R29/00 ,  G10L25/21

Abstract: 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 the loudspeaker. The gain control signal is generated as a function of all of the estimate of the temperature of the voice coil, the estimate of the rate of change of the temperature of the voice coil, and the estimate of the power dissipation in the voice coil.

公开(公告)号：US10206038B2

公开(公告)日：2019-02-12

申请号：US15905319

申请日：2018-02-26

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Jason William Lawrence ,  Roger David Serwy ,  Roberto Napoli

IPC: H04R3/00 ,  H04R3/04 ,  H04R29/00

Abstract: 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). A delay block (15) delays the digital audio signal and a gain block (14) applies a controlled gain to the delayed digital audio signal. An excursion predictor (12) is configured to receive a version of the audio signal from the signal path upstream of the delay block and determine a predicted excursion for a loudspeaker based on the audio signal. A gain controller (23) controls a gain setting (g) of the gain block in response to the predicted excursion and a first loudspeaker impulse response model and a predetermined excursion limit. The gain controller (23) is configured to determine at least one gain setting {ga gi} to be applied to a set of samples {Va . . . Vi} of the audio signal delayed by the delay block where the set of samples of the audio signal corresponds to a time-span which is less than an impulse response settling time of the loudspeaker.

公开(公告)号：US10198386B2

公开(公告)日：2019-02-05

申请号：US15051995

申请日：2016-02-24

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Robert David Rand ,  Graeme Gordon MacKay ,  Andrew James Howlett

IPC: G06F13/00 ,  G06F13/38 ,  G06F13/12 ,  G06F13/40

Abstract: This application relates to methods and apparatus for transfer of data between a host device (400) and a peripheral device (300) via a USB Type-C connector (100; 304) of the host device. A data controller is described that has a path controller (309, 310; 706) for establishing signal paths between circuitry of the host device and contacts (101) of said USB Type-C connector. The path controller is operable in at least first and second modes. In the first mode the path controller establishes separate signal paths to each of at least first, second, third and fourth contacts (A6, A7, B6, B7) of the USB Type-C connector and a plurality of the established signal paths are for transfer of analog audio data. In the second mode the path controller establishes a pair of signal paths to only a subset of said first to fourth contacts to provide a differential digital data path.