Appeal No. 2003-0774
Application 09/841,764
The claimed invention pertains to a method and apparatus
for coding a speech signal having varying characteristics. One
of a plurality of coding modes is applied to each speech signal
segment. A silence description coding mode is selected upon
identification of the absence of a substantially speech-like
characteristic of a segment. The silence description coding mode
is selected independent of the speech coding mode applied
immediately before the segment.
Representative claim 21 is reproduced as follows:
21. A communication device having a multi-rate speech coder
that performs silence description coding of a speech signal
having varying characteristics, comprising:
a voice activity detection circuit that is capable of
identifying a substantially speech-like characteristic of a
segment of the speech signal; and
a processing circuit communicatively coupled to the voice
activity detection circuit, the processing circuit being capable
of selectively applying one of a plurality of coding modes to the
segment of the speech signal;
wherein the plurality of coding modes comprises a plurality
of speech coding modes and a silence description coding mode,
wherein the processing circuit selects the silence
description coding mode upon the identification of the absence of
a substantially speech-like characteristic of the segment of the
speech signal independent of the speech coding mode applied
immediately before the segment.
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