Subband echo canceler including real time allocation among the s

Details Subband echo canceler including real time allocation among the s Subband echo canceler including real time allocation among the s

1989-08-07

1991-03-19

Dwyer, James L.

Multiplex communications

Wide area network

Packet switching

379406, 379410, H04B 320

Patent

active

050017012

ABSTRACT:
A subband echo canceler is disclosed in which blocks of real time are dynamically allocated to a plurality of generalized adaptive filters associated with a plurality of subbands in order to realize faster overall convergence to a desired impulse response. In one example, the real time block allocation is based on the weighted norm of the difference between the generalized adaptive filter coefficients from one sample period and an at least next subsequent sample period.

REFERENCES:
patent: 4349889 (1982-09-01), Van den Elzen et al.
patent: 4554417 (1985-11-01), Boyer
patent: 4574166 (1986-03-01), Grifton
D. L. Duttweiler et al., "A Single-Chip VLSI Echo Canceler", The Bell System Technical Journal, vol. 59, No. 2, Feb. 1980, pp. 149-160.
J. F. Doherty et al., "A New Fast Method For Channel Estimation", IEEE International Conference on Communications, Conference Record, vol. 2, Jun. 11-14, 1989, pp. 815-819.
"Row Action Methods For Huge and Sparse Systems and Their Applications", Sian Review, vol. 23, No. 4, Oct. 1981, pp. 444-466.
A. Gilloire, "Experiments With Sub-Band Acoustic Echo Cancellers for Teleconferencing", 1987 International Conference on Acoustics, Speech and Signal Processing, vol. 4, pp. 2141-2144.
W. Kellermann, "Analysis and Design of Multirate Systems For Cancellation of Acoustical Echoes", 1988 International Conference On Acoustics, Speech and Signal Processing, vol. 5, pp. 2570-2573.

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