Voice signal processing system mounted with echo canceller and voice signal processing method
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United States of America Patent
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Apr 29, 2008
Grant Date -
Oct 23, 2003
app pub date -
Apr 18, 2003
filing date -
Apr 19, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In order to prevent generation of a trapezoidal signal waveform due to limitations on dynamic ranges in an echo canceller and an echo path as voice signal transmission paths, a voice signal processing circuit of the voice signal processing system processes a waveform such that its signal level falls within the narrowest dynamic range without causing an overshoot and waveform crack. Process of a signal waveform is selectively conducted only of a waveform of a voice signal whose signal level is high to be liable to have distortion. As to a voice signal whose signal level is low and originally within a dynamic range, the signal is transmitted without having its waveform processed.
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