Method and apparatus for limiting residual echo in a speech sign

Details Method and apparatus for limiting residual echo in a speech sign Method and apparatus for limiting residual echo in a speech sign

1997-09-26

2000-03-07

Isen, Forester W.

Telephonic communications

Echo cancellation or suppression

379410, 379411, 370289, H04M 908

Patent

active

060350334

ABSTRACT:
In a method and arrangement for limiting residual echo in a speech signal-carrying line or channel, the echo signal is largely compensated by means of a correction signal. By means of a residual echo limiter, the transmission of the echo signal is prevented. The filter coefficients of the correlators are monitored for changes. This ensues by monitoring the absolute values of auxiliary correlators in comparators. If a change is determined, the time constants of a measurement means are changed over for the calculation of the residual echo, so that an adaptation to changed connection characteristics ensues rapidly, and the residual echo limiter again operates in an optimal manner.

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