Patent ID: 8271293

Claim:
A method of decoding an audio signal, comprising: (a) obtaining a bit stream that includes a plurality of frames, each frame including processing information pertaining to said frame and entropy-encoded quantization indexes representing audio data within said frame, and the processing information including: (i) a plurality of code book indexes, each code book index identifying a code book, (ii) code book application information identifying, for each code book identified by the code book indexes, at least one range of entropy-encoded quantization indexes to which said code book is to be applied, and (iii) window information; (b) decoding the entropy-encoded quantization indexes by applying the code books identified by the code book indexes to the ranges of entropy-encoded quantization indexes specified by the code book application information; (c) generating subband samples by dequantizing the decoded quantization indexes; (d) identifying a sequence of plural different window functions that were applied within a single frame of the audio data based on the window information; and (e) obtaining time-domain audio data by inverse-transforming the subband samples and using, within the single frame of the audio data, the plural different window functions indicated by the window information.