Digital echo canceller

Details Digital echo canceller Digital echo canceller

1982-12-20

1986-03-25

Rubinson, Gene Z.

H04B 320

Patent

active

045785430

ABSTRACT:
Echoes occur in telephone systems whenever signals in one channel of a two way conversation spill over into the other channel. The present echo canceller is particulary intended for use with a hands free telephone where the spill over is in the form of an acoustic echo from the loud speaker (2) to the microphone (1). The signals are sampled at a rate 1/T and are made available as digital samples. A synthetic copy of the echo signal is generated by means of an adaptive digital non-recursive time domain transversal filter. Instead of tapping the filter at unit time intervals equal to the sampling period T in the conventional manner, the filter is tapped at unit intervals equal to twice the sampling interval. For a given amount of calculation in the filter, this has the effect of doubling the length of the filter's impulse response.

REFERENCES:
patent: 3732410 (1973-05-01), Mackechnie
patent: 4131767 (1978-02-01), Weinstein
patent: 4349889 (1982-09-01), van den Elzen et al.
"Echo and Its Control in Telecommunication Networks", M. Erdreich, Commutation and Transmission, No. 4, 1981, pp. 5-18.
"A New Digital Echo Canceller for Two-Wire Four-Wire Duplex Data Transmission", K. Mueller, I.E.E.E. Transactions on Communications, vol. COM-24, No. 9, Sep. 1976, 956-62.

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