Sub-band voice codec with multi-stage codebooks and redundant coding
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Abstract
Techniques and tools related to coding and decoding of audio information are described. For example, redundant coded information for decoding a current frame includes signal history information associated with only a portion of a previous frame. As another example, redundant coded information for decoding a coded unit includes parameters for a codebook stage to be used in decoding the current coded unit only if the previous coded unit is not available. As yet another example, coded audio units each include a field indicating whether the coded unit includes main encoded information representing a segment of an audio signal, and whether the coded unit includes redundant coded information for use in decoding main encoded information.
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Citations
20 Claims
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1-6. -6. (canceled)
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7. A method comprising:
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at an audio processing tool, processing a bit stream for an audio signal, wherein the bit stream comprises parameters for a first group of codebook stages for representing a first segment of the audio signal, the first group of codebook stages comprising a first set of plural fixed codebook stages the number of codebook stages in the first group of codebook stages being determined according to a rate controller; and
outputting a result. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method comprising:
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at an audio processing tool, processing a bit stream for an audio signal, wherein the bit stream comprises, for each of a plurality of units parameterizable using an adaptive codebook, a field indicating whether or not adaptive codebook parameters are used for the unit; and
outputting a result. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification