Global Patent Index - EP 1055317 A1

EP 1055317 A1 2000-11-29 - 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

EP 1055317 A1 (DE)

Application

EP 99904718 A

Priority

  • DE 9900094 W
  • DE 19805942 A

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 (main, further and additional classification)

H04M 9/08

IPC 8 full level (invention and additional information)

H04R 3/02 (2006.01); H04B 3/20 (2006.01); H04M 1/60 (2006.01); H04M 9/08 (2006.01)

CPC (invention and additional information)

H04M 9/08 (2013.01)

Citation (search report)

See references of WO 9941898A1

Designated contracting state (EPC)

DE FR GB IT

EPO simple patent family

DE 19805942 C1 19990812; EP 1055317 A1 20001129; JP 2002503924 A 20020205; US 6618481 B1 20030909; WO 9941898 A1 19990819

INPADOC legal status


2004-02-11 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20030801

2001-01-31 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: INFINEON TECHNOLOGIES AG

- Ref Legal Event Code: RAP1

2000-11-29 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000801

2000-11-29 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE FR GB IT