EP 2538409 B1 20130828 - Noise reduction method for multi-microphone audio equipment, in particular for a hands-free telephony system
Title (en)
Noise reduction method for multi-microphone audio equipment, in particular for a hands-free telephony system
Title (de)
Verfahren zur Geräuschdämpfung für Audio-Gerät mit mehreren Mikrofonen, insbesondere für eine telefonische Freisprechanlage
Title (fr)
Procédé de débruitage pour équipement audio multi-microphones, notamment pour un système de téléphonie "mains libres"
Publication
Application
Priority
FR 1155377 A 20110620
Abstract (en)
[origin: EP2538409A1] The method involves estimating (22) probability (p) of presence of speech in a noisy acoustic signal. A spectral covariance matrix (Rn) of noise picked up by microphone sensors is estimated (46). Transfer functions (H) of acoustic channels between a speech source and the sensors are estimated. An optimal linear projector giving a single de-noised combined signal is calculated (48) from the matrix and the functions. The noise is selectively reduced (50) by applying variable gain specific to each frequency band and time frame of the noisy signal based on the probability and the combined signal.
IPC 8 full level
G10L 21/0208 (2013.01); H04R 3/00 (2006.01)
CPC (source: EP US)
G10L 21/0208 (2013.01 - EP US); H04R 3/005 (2013.01 - EP US); G10L 19/0204 (2013.01 - EP US); G10L 21/0232 (2013.01 - EP US); G10L 25/06 (2013.01 - EP US); G10L 25/18 (2013.01 - EP US); G10L 25/78 (2013.01 - EP US); G10L 2021/02082 (2013.01 - EP US); G10L 2021/02166 (2013.01 - EP US); H04R 2201/403 (2013.01 - EP US); H04R 2499/13 (2013.01 - EP US)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
EP 2538409 A1 20121226; EP 2538409 B1 20130828; CN 102855880 A 20130102; CN 102855880 B 20160928; FR 2976710 A1 20121221; FR 2976710 B1 20130705; US 2012322511 A1 20121220; US 8504117 B2 20130806
DOCDB simple family (application)
EP 12170874 A 20120605; CN 201210202063 A 20120619; FR 1155377 A 20110620; US 201213489214 A 20120605