EP 2014132 A2 20090114 - ECHO AND NOISE CANCELLATION
Title (en)
ECHO AND NOISE CANCELLATION
Title (de)
ECHO- UND RAUSCHUNTERDRÜCKUNG
Title (fr)
ANNULATION D'ECHO ET DE BRUIT
Publication
Application
Priority
- US 2007065686 W 20070330
- US 38172806 A 20060504
- US 38172906 A 20060504
- US 38172506 A 20060504
- US 38172706 A 20060504
- US 38172406 A 20060504
- US 38172106 A 20060504
- US 2006017483 W 20060504
- US 41898806 A 20060504
- US 41898906 A 20060504
- US 42904706 A 20060504
Abstract (en)
[origin: WO2007130765A2] Methods and apparatus for echo cancellation in a system having a speaker and a microphone are disclosed. The speaker receives a speaker signal x(t). The microphone receives a microphone signal d(t) containing a local signal s(t) and an echo signal x<SUB>1</SUB>(t) that is dependent on the speaker signal x(t). The microphone signal d(t) is filtered in parallel with first and second adaptive filters having complementary echo cancellation properties relative to each other. A minimum echo output e<SUB>3</SUB>(t) is determined from an output e<SUB>1</SUB>(t) of the first adaptive filter and an output e<SUB>2</SUB>(t) of the second adaptive filter. The minimum echo output has a smaller energy and less correlation to the speaker signal x(t). A microphone output is then generated using the minimum echo output e<SUB>3</SUB>(t).
IPC 8 full level
A63F 13/06 (2006.01); G06F 3/033 (2006.01); G10L 21/02 (2006.01); G10L 21/0208 (2013.01); H04M 9/08 (2006.01); G10L 21/0216 (2013.01); G10L 25/18 (2013.01)
CPC (source: EP)
G10L 21/0208 (2013.01); H04M 9/082 (2013.01); G10L 25/18 (2013.01); G10L 2021/02163 (2013.01)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA HR MK RS
DOCDB simple family (publication)
WO 2007130765 A2 20071115; WO 2007130765 A3 20081218; EP 2012725 A2 20090114; EP 2012725 A4 20111012; EP 2014132 A2 20090114; EP 2014132 A4 20130102; JP 2009535996 A 20091001; JP 2009535997 A 20091001; JP 2010171985 A 20100805; JP 4476355 B2 20100609; JP 4833343 B2 20111207; JP 4866958 B2 20120201; WO 2007130766 A2 20071115; WO 2007130766 A3 20080904
DOCDB simple family (application)
US 2007065686 W 20070330; EP 07759872 A 20070330; EP 07759884 A 20070330; JP 2009509908 A 20070330; JP 2009509909 A 20070330; JP 2010019147 A 20100129; US 2007065701 W 20070330