Echo reduction circuit
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United States of America Patent
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Feb 5, 1991
Grant Date -
N/A
app pub date -
Oct 28, 1988
filing date -
Oct 28, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An echo reduction circuit that may be used to reduce the returned echo in communication links with signficant delay. By making effective use of the echo-masking effect of near-simultaneous desired speech energy and the redundancy present in normal speech, the circuit makes possible wide bandwidth, non-choppy, perceived distortion-free, and perceived echo-free teleconferencing. The circuit performs a rapid time constant, semi-waveform-following partial attenuation of a preemphasized version of the returning transmit signal proportional to a calculation of the likely strength of the returned echo in relation to the strength of the local speech.
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