Method and apparatus for voice transcoding between variable rate coders
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United States of America Patent
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Oct 7, 2008
Grant Date -
Mar 10, 2005
app pub date -
Sep 10, 2003
filing date -
Sep 10, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A variable-rate voice transcoder that transcodes a bitstream representing frames of data encoded according to a first compression standard to a bitstream representing frames of data according to a second compression standard; the second compression standard defines a variable-rate voice codec. The method includes unquantizing a bitstream into a first set of parameters compatible with the first compression standard. The first set of parameters in addition to external control commands are then used to determine a frame class and a rate for the second compression standard. Next, the first set of parameters are transformed into a second set of parameters compatible with the second compression standard according to the frame-classification and rate determination decision. Lastly, the second set of parameters is packed into a bitstream compatible with the second compression standard.
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