Audio decoding using variable-length codebook application...

Details Audio decoding using variable-length codebook application... Audio decoding using variable-length codebook application...

2011-05-03

2011-05-03

Wozniak, James S (Department: 2626)

Data processing: speech signal processing, linguistics, language

Audio signal bandwidth compression or expansion

C704S200000, C704S201000, C704S211000, C704S212000, C704S222000, C704S229000, C704S230000, C704S503000, C375S240000, C375S240220, C375S240250

Reexamination Certificate

active

07937271

ABSTRACT:
Provided are, among other things, systems, methods and techniques for decoding an audio signal from a frame-based bit stream. Each frame includes processing information pertaining to the frame and entropy-encoded quantization indexes representing audio data within the frame. The processing information includes: (i) code book indexes, (ii) code book application information specifying ranges of entropy-encoded quantization indexes to which the code books are to be applied, and (iii) window information. The entropy-encoded quantization indexes are decoded by applying the identified code books to the corresponding ranges of entropy-encoded quantization indexes. Subband samples are then generated by dequantizing the decoded quantization indexes, and a sequence of different window functions that were applied within a single frame of the audio data is identified based on the window information. Time-domain audio data are obtained by inverse-transforming the subband samples and using the plural different window functions indicated by the window information.

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