Telephonic communications – Echo cancellation or suppression
Patent
1994-12-19
1998-02-03
Zele, Krista
Telephonic communications
Echo cancellation or suppression
379390, 379409, 379392, 381 57, 381 94, H04M 908, H04B 1500
Patent
active
057153108
ABSTRACT:
The invention provides an apparatus and method and a device for echo attenuation in a telephone. According to the invention, the echo attenuation in the telephone is adapted to the background noise such that the ambient background noise in telephone (10) is measured with a noise detector (1) and the noise level is determined in a background noise measurement unit (2). The background noise that has been determined is used to set the attenuation parameters in parameter determining unit (3). The signal level received from the other subscriber's telephone (11) is measured in input signal level measurement unit (4). The feed signal of the telephone is attenuated in attenuation Control unit (6) on the basis of the attenuation values calculated, which have been determined from the attenuation parameters and the signal level received by the other subscriber in output signal attenuation determining unit (5).
REFERENCES:
patent: 3889059 (1975-06-01), Thompson et al.
patent: 4560840 (1985-12-01), Hansen
patent: 4630304 (1986-12-01), Borth et al.
patent: 5058153 (1991-10-01), Carew et al.
patent: 5099472 (1992-03-01), Townsend et al.
patent: 5357567 (1994-10-01), Barron et al.
patent: 5381473 (1995-01-01), Andrea et al.
patent: 5398281 (1995-03-01), Kurokawa et al.
patent: 5471528 (1995-11-01), Reesor
patent: 5485515 (1996-01-01), Allen et al.
patent: 5485522 (1996-01-01), Solve et al.
patent: 5548638 (1996-08-01), Yamaguchi et al.
Kumar Devendra T.
Nokia Mobile Phones Ltd.
Zele Krista
LandOfFree
Apparatus and method for echo attenuation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus and method for echo attenuation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for echo attenuation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-669642