Method and apparatus for voice trans-rating in multi-rate voice coders for telecommunications
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United States of America Patent
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Issued Date -
Nov 24, 2005
app pub date -
May 11, 2004
filing date -
May 11, 2004
priority date (Note) -
Abandoned
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Abstract
Method and apparatus for trans-rating a bitstream of data through multi-rate voice coders converting a bitstream representing frames of data encoded according to a first voice compression method of a first rate to a second voice compression method according to a second rate. A trans-rating pair includes voice compression parameters mapping modules. The method of trans-rating includes either bit-unpacking or unquantization on an encoded packet at input site to obtain rate information and voice compression parameters according to the first rate voice compression method. The information of the first rate and the required output rate, namely a second rate type, in addition to external control commands, are then used to determine the converting strategy of the trans-rating pair. Next, at least some of the compression parameters of the first rate are passed through, or mapped, into compression parameters of the second rate compatible with the second rate voice compression method.
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