公开(公告)号：US20240038211A1

公开(公告)日：2024-02-01

申请号：US17875364

申请日：2022-07-27

Applicant: CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD.

Inventor： John Bryan-Merrett ,  Mert Salahi ,  Wilbur Lawrence ,  Samuel P. Ebenezer ,  Rachid Kerkoud

IPC: G10K11/178

CPC classification number: G10K11/17885 ,  G10K11/17853 ,  G10K11/17881

Abstract: An adaptive noise-canceling system generates an anti-noise signal with a filter that has a response controlled by a set of coefficients selected from a collection of coefficient sets. The adaptive noise-canceling system includes an acoustic output transducer for reproducing a signal containing the anti-noise signal, a first microphone for measuring ambient noise at a first location to produce a first noise measurement signal, a second microphone for measuring the ambient noise at a second location to generate a second noise measurement signal, and an analysis subsystem for analyzing the first noise measurement signal and the second noise measurement signal. The adaptive noise-canceling system also includes a controller that selects the set of coefficients from the collection of coefficient sets according to a phase difference between the first noise measurement signal and the second noise measurement signal as determined by the analysis subsystem.

公开(公告)号：US11948546B2

公开(公告)日：2024-04-02

申请号：US17858771

申请日：2022-07-06

Applicant: CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD.

Inventor： Samuel P. Ebenezer ,  Rachid Kerkoud

IPC: G10K11/178 ,  H04R1/10

CPC classification number: G10K11/17854 ,  G10K11/17823 ,  G10K11/17825 ,  G10K11/17881 ,  H04R1/1083 ,  G10K2210/1081 ,  G10K2210/3026 ,  G10K2210/3027 ,  G10K2210/3028 ,  G10K2210/3044 ,  H04R2460/01

Abstract: An adaptive noise-canceling system generates an anti-noise signal from a noise reference signal with a feed-forward filter that filters the noise reference signal to produce the anti-noise signal. The feed-forward filter has a first response controlled by a set of first coefficients. The adaptive noise-canceling system includes a measurement subsystem for measuring a characteristic of an acoustic environment of the adaptive noise-canceling system, a classifier for classifying the characteristic of the acoustic environment by analyzing an output of the measurement subsystem, and a controller that provides the set of first coefficients to the feed-forward filter in conformity with an output of the classifier. The controller may include a look-up table for providing sets of values of the first coefficients to the feed-forward filter in conformity with an indication provided from the classifier and corresponding to a classification of the characteristic of the acoustic environment of the adaptive noise-canceling system.

公开(公告)号：US20240013765A1

公开(公告)日：2024-01-11

申请号：US17858771

申请日：2022-07-06

Applicant: CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR LTD.

Inventor： Samuel P. Ebenezer ,  Rachid Kerkoud

IPC: G10K11/178 ,  H04R1/10

CPC classification number: G10K11/17854 ,  G10K11/17823 ,  H04R1/1083 ,  G10K11/17881 ,  G10K11/17825 ,  G10K2210/3044 ,  G10K2210/3027 ,  G10K2210/3028 ,  G10K2210/1081 ,  H04R2460/01 ,  G10K2210/3026

Abstract: An adaptive noise-canceling system generates an anti-noise signal from a noise reference signal with a feed-forward filter that filters the noise reference signal to produce the anti-noise signal. The feed-forward filter has a first response controlled by a set of first coefficients. The adaptive noise-canceling system includes a measurement subsystem for measuring a characteristic of an acoustic environment of the adaptive noise-canceling system, a classifier for classifying the characteristic of the acoustic environment by analyzing an output of the measurement subsystem, and a controller that provides the set of first coefficients to the feed-forward filter in conformity with an output of the classifier. The controller may include a look-up table for providing sets of values of the first coefficients to the feed-forward filter in conformity with an indication provided from the classifier and corresponding to a classification of the characteristic of the acoustic environment of the adaptive noise-canceling system.

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.