Appeal No. 2005-0376
Application No. 10/034,120
BACKGROUND
The invention relates to transmission of voice data over networks such as the
Internet. As generally related at page 3 of the instant specification, silence suppression
in the prior art was used to enhance bandwidth and throughput, which removed the
necessity of transmitting the silence portion of a phone conversation. Rather than
transmit the silence portion, a silence insertion descriptor, representative of the non-
speech portion of the conversation, could be inserted into the data stream to recover
bandwidth that would otherwise be allocated for voice traffic. On the receiving side,
comfort noise generation utilized the transmitted silence to construct and replace the
silence part of speech, avoiding absolute silence and the perception of on/off
transmission. The instant disclosed invention is directed to a system and method for
utilizing information content in speech and a transition hangover between speech and
noise, at the receiving side, to generate comfort noise, obviating the need for silence
insertion descriptors. Representative claim 1 is reproduced below.
1. A method for generating comfort noise, the method comprising the steps
of:
identifying a plurality of silence packets derived from speech data received
at a decoder side;
adapting to the plurality of silence packets derived from the speech data
by using an adaptation algorithm that adapts with time;
detecting a start of a silence segment; and
generating comfort noise as specified by the adaptation algorithm at the
start of the silence segment.
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