Echo canceller for a long-distance telephone network

Details Echo canceller for a long-distance telephone network Echo canceller for a long-distance telephone network

1981-09-22

1985-07-02

Rubinson, Gene Z.

Boots, shoes, and leggings

364723, H04B 320

Patent

active

045270201

ABSTRACT:
An echo canceller for use in a long-distance telephone network having a four-wire circuit and a two-wire circuit in which echoes are inherently produced at the junction of the four-wire circuit and the two-wire circuit. A sample interpolator converts the incoming digital signal into a digital signal having the same sampling rate as that of the outgoing digital signal on the basis of relative positions of sampling time for corresponding imaginary envelopes of the incoming and outgoing digital signals. An echo estimator produces an estimated echo signal responsive to the output of the sample interpolator for cancelling the echo signal. The estimated echo signal is substracted from the unprocessed digital signal to produce an echo-cancelled digital signal.

REFERENCES:
patent: 4020332 (1977-04-01), Crochiere et al.
patent: 4064379 (1977-12-01), Horna
patent: 4205575 (1980-06-01), Hoskinson et al.
patent: 4270026 (1981-05-01), Shenoi et al.
patent: 4334128 (1982-06-01), Snijders
patent: 4363938 (1982-12-01), Daaboul et al.
patent: 4379347 (1983-04-01), Giradi et al.
patent: 4411006 (1983-10-01), Horna
R. Schafer, L. Rabiner; "A Digital Signal Processing Approach to Interpolation"; Proceedings of the IEEE; vol. 61, No. 6; Jun. 1973; pp. 692-702.

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