Echo cancellation using transversal filters

Details Echo cancellation using transversal filters Echo cancellation using transversal filters

1981-10-13

1984-01-10

Pellinen, A. D.

1791708, 17917531E, H04B 320

Patent

active

044254830

ABSTRACT:
A transversal filter echo canceller includes two stores each for storing a set of coefficients for the transversal filter. The suitability of a set of coefficients stored in one of the stores is checked by supplying a pulse to the receive path and transversally filtering it, and comparing the level of the resultant transmit path signal, after subtraction of the transversally filtered pulse, with a threshold. At the same time the impulse response before the subtraction is stored in the other store. If the threshold is exceeded the functions of the two stores are interchanged and the check is repeated. The checking can be effected only once for a transmission line not subject to change, or, in the case of a transmission line which is subject to change, at the start of each telephone connection established via the line and optionally during conversation pauses during the connection.

REFERENCES:
patent: 3465106 (1969-09-01), Nagata et al.
patent: 3588385 (1971-06-01), Moye
patent: 3735055 (1973-05-01), Thomas
patent: 3860768 (1975-01-01), Wehrmann
patent: 4126770 (1978-11-01), Sato et al.
Y. Kato et al.; "A Digital Adaptive Echo Canceller"; NEC Research and Development; No. 31; Oct. 1973; pp. 32-41.

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