Adaptive filter update gain normalization

Details Adaptive filter update gain normalization Adaptive filter update gain normalization

1984-09-26

1986-05-27

Rubinson, Gene Z.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

333166, 364724, H04B 320, H03H 1500

Patent

active

045916691

ABSTRACT:
Update gain normalization is employed in adaptive filters to control weighting of the filter impulse response updates in order to converge properly to a desired impulse response. Singing, i.e., oscillating, of the filter is overcome by adjusting the update gain when an incoming signal power estimate used to normalize the gain exceeds a prescribed threshold value. In one example, the normalized gain is adjusted to be a fixed value for power estimate values which exceed the threshold. In accordance with another aspect of the invention, a single normalized gain value is used to adjust the update gain in two adaptive filters employed as echo cancelers in a bidirectional voice frequency repeater.

REFERENCES:
patent: 3821493 (1974-06-01), Chiba
patent: 3922505 (1975-11-01), Hoge
patent: 4467441 (1984-08-01), Gritton
patent: 4468640 (1984-08-01), Gritton
patent: 4468641 (1984-08-01), Duttweiler et al.
D. L. Duttweiler, "A Twelve-Channel Digital Echo Canceler", IEEE Transactions on Communications, vol. COM-26, No. 5, May 1978.

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