Echo canceler

Details Echo canceler Echo canceler

1996-03-22

1998-04-14

Brown, Thomas W.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

370292, H04B 323, H04M 174

Patent

active

057402426

ABSTRACT:
An echo canceler is disclosed having a voice detector. When the voice detector detects the absence of input signals, the echo canceler is trained. In the training mode, the echo canceler receives an impulse signal from an impulse generator, as input through a switching device. When the input of the echo canceler is the impulse signal, a switch is turned off, a signal on a receiving line is stored in a tap coefficient memory, and the impulse signal on a transmitting line is stored in a transmission signal memory. Using the signals stored in the two memories, a convolution operation is performed by a convolution arithmetic unit. The data of the tap coefficient memory directly before the end of training are used for the tap coefficients after the training period.

REFERENCES:
patent: 3465106 (1969-09-01), Nagata et al.
patent: 3535473 (1970-10-01), Flanagan et al.
patent: 3735055 (1973-05-01), Thomas
patent: 3860768 (1975-01-01), Wehrmann
patent: 4007341 (1977-02-01), Sourgens et al.
patent: 4021623 (1977-05-01), Suyderhoud et al.
patent: 4491701 (1985-01-01), Duttweiler et al.
patent: 5007044 (1991-04-01), Miyoshi et al.
patent: 5050160 (1991-09-01), Fuda
patent: 5381474 (1995-01-01), Lahdemaki et al.
patent: 5400399 (1995-03-01), Umemoto et al.
patent: 5428604 (1995-06-01), Fuda
patent: 5590121 (1996-12-01), Geigel et al.

Affiliated with

Also associated with

Rating

Echo canceler does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Echo canceler, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Echo canceler will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-644154