EP 1055318 A2 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 9900151 W 19990121
- DE 19806015 A 19980213
Abstract (en)
[origin: DE19806015A1] The present invention relates to a method for improving acoustic noise attenuation, wherein said method uses a combination which comprises an adaptation control for the partial-band echo compensation process as well as a global-band post-filtration for suppressing residual echo in hand-free devices. This method also uses a level balance (22) as well as a controllable frequency-selection echo compensation (28) with partial-band processing. After the frequency-selection echo compensation (28), the outputted signal is submitted to a post-filtration in another frequency-selection filter (30) using an Wiener-equation adjustment algorithm (Wiener filtration). A single control value (increment vector) is used for controlling both the frequency-selection echo compensation and the other filter. This method can thus be implemented with a very reduced amount of calculations so that it can also be used in simple consumer-directed processors.
IPC 1-7
IPC 8 full level
H04B 3/20 (2006.01); H04M 1/60 (2006.01); H04M 9/08 (2006.01); H04R 3/02 (2006.01)
CPC (source: EP US)
H04M 9/08 (2013.01 - EP US)
Citation (search report)
See references of WO 9941897A2
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
DE 19806015 A1 19990826; DE 19806015 C2 19991223; EP 1055318 A2 20001129; JP 2002503923 A 20020205; US 6834108 B1 20041221; WO 9941897 A2 19990819; WO 9941897 A3 19990923
DOCDB simple family (application)
DE 19806015 A 19980213; DE 9900151 W 19990121; EP 99907267 A 19990121; JP 2000531947 A 19990121; US 62227001 A 20010129