Bitstream syntax for multi-process audio decoding
AssigneeMicrosoft Corporation
InventorsKazuhito Koishida, Sanjeev Mehrotra, Chao He, Wei-Ge Chen
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Abstract
An audio decoder provides a combination of decoding components including components implementing base band decoding, spectral peak decoding, frequency extension decoding and channel extension decoding techniques. The audio decoder decodes a compressed bitstream structured by a bitstream syntax scheme to permit the various decoding components to extract the appropriate parameters for their respective decoding technique.
Claims5
A method of decoding a compressed audio bitstream containing syntax elements conforming to a bitstream syntax, the bitstream syntax defining a base coding layer and a frequency extension coding layer for coding a portion of audio content using a frequency extension coding, the method comprising:
- reading the base coding layer and frequency extension coding layer of the compressed audio bitstream;
- parsing a plurality of syntax elements from the frequency extension coding layer specifying parameters used in the frequency extension coding, wherein the parameters comprise parameters specifying frequency extension coding using a different transform window size than a base coding layer;
- processing coded audio content of the frequency extension coding layer to reconstruct the portion of audio content in an output audio signal;
- playing the output audio signal.
Dependencies are inferred from the claim text.