Double talk and line noise detector for a echo canceller

Details Double talk and line noise detector for a echo canceller Double talk and line noise detector for a echo canceller

1984-05-09

1987-02-24

Rubinson, Gene Z.

Telephonic communications

Echo cancellation or suppression

H04B 320

Patent

active

046458832

ABSTRACT:
An echo canceller comprising an adaptive finite impulse response filter receiving a receive signal and having its output subtracted from a send signal, a non-linear device for attenuating low level signals of the send signal and a noise injector for injecting noise into the send signal proportional to a dynamically measured background noise in the subtracted output. The non-linear device and the noise injector are disabled when the receive signal is below expected noise level or the send signal is at a high level relative to the receive signal.

REFERENCES:
patent: 3161838 (1964-12-01), Flanagan et al.
patent: 3427478 (1969-02-01), Etter
patent: 4000369 (1976-12-01), Paul, Jr. et al.
patent: 4282411 (1981-08-01), Stewart
patent: 4351983 (1982-09-01), Crouse et al.
patent: 4360712 (1982-11-01), Horna

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