Processing

Please wait...

Settings

Settings

Goto Application

1. WO2014172021 - SYSTEMS AND METHODS FOR ADAPTIVE NOISE CANCELLATION BY BIASING ANTI-NOISE LEVEL

Publication Number WO/2014/172021
Publication Date 23.10.2014
International Application No. PCT/US2014/019469
International Filing Date 28.02.2014
IPC
G10K 11/178 2006.01
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES;  METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
175using interference effects; Masking sound
178by electro-acoustically regenerating the original acoustic waves in anti-phase
CPC
G10K 11/16
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
G10K 11/17817
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
175using interference effects; Masking sound
178by electro-acoustically regenerating the original acoustic waves in anti-phase
1781characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
17813characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
17817between the output signals and the error signals, i.e. secondary path
G10K 11/17825
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
175using interference effects; Masking sound
178by electro-acoustically regenerating the original acoustic waves in anti-phase
1781characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
17821characterised by the analysis of the input signals only
17825Error signals
G10K 11/17827
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
175using interference effects; Masking sound
178by electro-acoustically regenerating the original acoustic waves in anti-phase
1781characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
17821characterised by the analysis of the input signals only
17827Desired external signals, e.g. pass-through audio such as music or speech
G10K 11/17833
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
175using interference effects; Masking sound
178by electro-acoustically regenerating the original acoustic waves in anti-phase
1783handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
17833by using a self-diagnostic function or a malfunction prevention function, e.g. detecting abnormal output levels
G10K 11/17854
GPHYSICS
10MUSICAL INSTRUMENTS; ACOUSTICS
KSOUND-PRODUCING DEVICES
11Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
16Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
175using interference effects; Masking sound
178by electro-acoustically regenerating the original acoustic waves in anti-phase
1785Methods, e.g. algorithms; Devices
17853of the filter
17854the filter being an adaptive filter
Applicants
  • CIRRUS LOGIC, INC. [US]/[US]
Inventors
  • YONG, Chin Huang
  • ALDERSON, Jeffrey D.
Agents
  • PREWITT, Brian K.
Priority Data
13/943,45416.07.2013US
61/812,84217.04.2013US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) SYSTEMS AND METHODS FOR ADAPTIVE NOISE CANCELLATION BY BIASING ANTI-NOISE LEVEL
(FR) SYSTEMES ET PROCEDES DE SUPPRESSION DE BRUIT ADAPTATIVE PAR POLARISATION DU NIVEAU ANTIBRUIT
Abstract
(EN)
A processing circuit may comprise an adaptive filter having a response generating an antinoise signal from a reference microphone signal, a secondary path estimate filter modeling an electroacoustic path of a source audio signal, a biasing portion that generates a scaled antinoise signal by applying a scaling factor and the response of the secondary path estimate filter to the antinoise signal, and a coefficient control block that shapes the response of the adaptive filter in conformity with the reference microphone signal and a modified playback corrected error signal by adapting the response of the adaptive filter to minimize ambient audio sounds in the error microphone signal, wherein the playback corrected error is based on a difference between the error microphone signal and source audio signal and the modified playback corrected error signal is based on a difference between the playback corrected error signal and scaled antinoise signal.
(FR)
L'invention concerne un circuit de traitement qui peut comprendre un filtre adaptatif ayant une réponse générant un signal antibruit à partir d'un signal de microphone de référence, un filtre d'estimation de chemin secondaire modélisant un chemin électroacoustique d'un signal audio source, une partie de polarisation qui génère un signal antibruit mis à l'échelle par application d'un facteur de mise à l'échelle et de la réponse du filtre d'estimation de chemin secondaire au signal antibruit, et un bloc de commande de coefficient qui façonne la réponse du filtre adaptatif conformément au signal de microphone de référence et à un signal d'erreur corrigée de lecture modifié par adaptation de la réponse du filtre adaptatif pour réduire au minimum des sons audio ambiants dans le signal de microphone d'erreur, l'erreur corrigée de reproduction étant basée sur une différence entre le signal de microphone d'erreur et le signal audio source, et le signal d'erreur corrigée de reproduction modifié étant basé sur une différence entre le signal d'erreur corrigée de reproduction et le signal antibruit mis à l'échelle.
Latest bibliographic data on file with the International Bureau