Echo canceler with cascaded filter structure

Details Echo canceler with cascaded filter structure Echo canceler with cascaded filter structure

1983-06-21

1986-08-12

Rubinson, Gene Z.

H04B 320

Patent

active

046058265

ABSTRACT:
An echo canceler performs convergence in a multiple step manner using a plurality of adaptive digital filters. The adaptive digital filters are sequentially operated to supply data to the corresponding D/A converters such that the echo signals are sequentially cancelled in a stepwise manner. Random access memories are used to allow a decrease in the required number of bits and thus the dimensions of the memories, hence in the overall circuit, so that a compact LSI echo canceler can be easily obtained.

REFERENCES:
patent: 3647992 (1972-03-01), Thomas
patent: 4377793 (1983-03-01), Horna
patent: 4464746 (1984-08-01), Snijders et al.
IEEE Standard Dictionary of Electrical and Electronics Terms, Second Edition, The Institute of Electrical and Electronics Engineers, New York, N.Y., May 12, 1978, pp.798, 815, 868.
"Digital Echo Cancellation for Baseband Data Transmission", IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-27, No. 6, pp. 768-781, Dec. 1979.
"A New Digital Echo Canceler for Two-Wave Subscriber Lines", IEEE Transactions on Communications, vol. COM-29, No. 11, pp. 1573-1581, Nov. 1981.

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