Device for processing echo, particularly acoustic echo in a telephone line
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United States of America Patent
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Aug 30, 1994
Grant Date -
N/A
app pub date -
Apr 16, 1991
filing date -
Aug 18, 1989
priority date (Note) -
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status (Latency Note)
Importance
Abstract
The device comprises an echo cancelling circuit receiving a first signal and a second signal and a real echo between channels for producing a third signal containing the second signal and a difference between the real echo and the estimated echo. Detectors detect the echo difference and the second signal in the third signal when the level of the third signal exceeds a predetermined threshold. Circuits gain-control the adaptation in the adaptive filtration of the echo cancelling circuit in such a way as to modify the adaptation gain when the second signal is not detected and to prohibit all filtration modifications as long as the second signal is detected. For instance, for an acoustic echo in a telephone set, the echo is not processed when the third signal contains a local speech signal as second signal.
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