Adaptive filter and echo canceller

Details Adaptive filter and echo canceller Adaptive filter and echo canceller

1996-03-15

1997-06-10

Zele, Krista M.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379410, 370290, 36472419, H04B 320, H04M 908

Patent

active

056384394

ABSTRACT:
An adaptive filter in the form of an FIR or IIR filter performs an adaptive filtering process relative to an input signal using a plurality of tap coefficients. The adaptive filter derives a vector formed by absolute values of the plurality of tap coefficients and weights step sizes of the plurality of tap coefficients using the first vector. The adaptive filter updates the plurality of tap coefficients based on the weighted step sizes. With this arrangement, the optimum tap coefficients can be achieved with high convergence speed. The adaptive filter is applicable to an echo canceller, such as, an acoustic echo canceller or a line echo canceller, so that echo canceling is effectively achieved by updating the tap coefficients with high accuracy and with high speed.

REFERENCES:
patent: 4408332 (1983-10-01), Sari
patent: 4989170 (1991-01-01), Batruni et al.
patent: 5192918 (1993-03-01), Sugiyama
patent: 5245561 (1993-09-01), Sigiyama
patent: 5272695 (1993-12-01), Makino et al.
patent: 5323459 (1994-06-01), Hirano
patent: 5329472 (1994-07-01), Sugiyama
patent: 5371789 (1994-12-01), Hirano
patent: 5390364 (1995-02-01), Webster et al.
patent: 5408530 (1995-04-01), Makino et al.
patent: 5428562 (1995-06-01), Gay
patent: 5475632 (1995-12-01), Sugiyama
patent: 5517435 (1996-05-01), Sugiyama
patent: 5526426 (1996-06-01), McLaughlin
Shoji Makino and Nobuo Koizumi, Improvement on Adaptation of an Echo Canceller in a Room, Mar. 1989, pp. 15-21, NTT Human Interface Laboratories.
Shoji Makino and Yutaka Kaneda, Exponentially Weighted Step-Size NLMS Adaptive Filter Based on the Statistics of a Room Impulse Response, pp. 9-20, Apr. 8, 1992, NTT Human Interface Laboratories.

Affiliated with

Also associated with

Rating

Adaptive filter and echo canceller does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-771340