Optimization of adaptive filter tap settings for subband acousti

Details Optimization of adaptive filter tap settings for subband acousti Optimization of adaptive filter tap settings for subband acousti

1994-12-23

1996-08-20

Hofsass, Jeffery

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379406, 379407, 379411, 370 321, H04M 908

Patent

active

055486428

ABSTRACT:
A subband acoustic echo canceller for a telecommunications teleconferencing room is equiped with subband adaptive filters and filter taps associated with said subbands. A data store is provided containing a weight list for controlling allocation of the filter taps among the subbands. An optimum tap profile as determined by the weights is a composite of room acoustic impulse response and weighting adjustments based on one or more measures of perceived human acoustic sensitivity experienced by far-end users. An active periodic adjustment of the weights responsive to detection of sibilant energy in the incoming path further improves echo cancellation. Active measurement and updating of the room acoustic impulse response provides further refinement.

REFERENCES:
patent: 5272695 (1993-12-01), Makino et al.
patent: 5371789 (1994-12-01), Hirano
patent: 5408530 (1995-04-01), Makino et al.
"Acoustic Echo Cancellation Using Multirate Techniques" Perex and Amano, IEICE Trans. V. E. 74, No. 11, Nov. 1991.

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