Residual echo suppressor for echo canceller

Details Residual echo suppressor for echo canceller Residual echo suppressor for echo canceller

1979-06-04

1981-08-04

Konick, Bernard

H04B 320

Patent

active

042824117

ABSTRACT:
A residual echo suppressor for an echo canceller compares the levels of the uncancelled signal and the residual signal. If the level of the residual signal has a selected proportionality to the level of the uncancelled signal, it is assumed that the residual signal consists solely of echo and it is suppressed to zero. If the residual signal fails the proportionality test, which indicates that it may contain speech, it is transmitted in its entirety. To prevent sporadic transmissions of residual signal which fails the proportionality test, but which might not contain speech, a hysteresis circuit blocks transmission of the residual signal upon the same continuously failing the proportionality test for a selected time, at the end of which time the residual signal is assumed to contain speech and is transmitted.

REFERENCES:
patent: 3508017 (1970-04-01), Unrue, Jr.
patent: 3754105 (1973-08-01), Poschenrieder et al.
patent: 3894200 (1975-07-01), Campanella et al.
patent: 4005277 (1977-01-01), Araseki et al.

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