EP 1055317 A1 20001129 - METHOD FOR IMPROVING ACOUSTIC NOISE ATTENUATION IN HAND-FREE DEVICES
Title (en)
METHOD FOR IMPROVING ACOUSTIC NOISE ATTENUATION IN HAND-FREE DEVICES
Title (de)
VERFAHREN ZUR VERBESSERUNG DER AKUSTISCHEN RÜCKHÖRDÄMPFUNG IN FREISPRECHEINRICHTUNGEN
Title (fr)
PROCEDE POUR AMELIORER L'AFFAIBLISSEMENT ACOUSTIQUE DU SIGNAL LOCAL DANS DES APPAREILS MAIN LIBRE
Publication
Application
Priority
- DE 9900094 W 19990118
- DE 19805942 A 19980213
Abstract (en)
[origin: DE19805942C1] The present invention relates to a method for improving acoustic noise attenuation in hand-free devices essentially used in automobiles, wherein said method uses a level balance (22) as well as a plurality of echo-compensation adaptive filters (34) each for processing a given partial band. In at least one partial band, another adaptive filter (shadow filter 36) of a lower order is connected in parallel to an adaptive echo-compensation filter (34). Spatial modifications can thus be determined on the basis of a combined estimation which comprises a correlation analysis as well as a residual-error comparison of the two concurring filters (34, 36).
IPC 1-7
IPC 8 full level
H04R 3/02 (2006.01); H04B 3/20 (2006.01); H04M 1/60 (2006.01); H04M 9/08 (2006.01)
CPC (source: EP US)
H04M 9/08 (2013.01 - EP US)
Citation (search report)
See references of WO 9941898A1
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
DE 19805942 C1 19990812; EP 1055317 A1 20001129; JP 2002503924 A 20020205; US 6618481 B1 20030909; WO 9941898 A1 19990819
DOCDB simple family (application)
DE 19805942 A 19980213; DE 9900094 W 19990118; EP 99904718 A 19990118; JP 2000531948 A 19990118; US 63758800 A 20000814