Voice signal processing system mounted with echo canceller...

Details Voice signal processing system mounted with echo canceller... Voice signal processing system mounted with echo canceller...

2008-04-29

2008-04-29

McFadden, Susan (Department: 2626)

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

Reexamination Certificate

active

07366657

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.

REFERENCES:
patent: 5636323 (1997-06-01), Umemoto et al.
patent: 6700979 (2004-03-01), Washiya
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patent: 05-110694 (1993-04-01), None
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patent: 2001-094479 (2001-04-01), None
Office Action issued by Japanese Patent Office on Dec. 19, 2006 in connection with corresponding Japanese application No. 2002-118114.
English translation of relevant portions of Japanese Office Action dated Dec. 19, 2006 issued in connection with corresponding Japanese application NO. 2002-118114.

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