ADAPTIVE-BLOCK-LENGTH, ADAPTIVE-TRANSFORM, AND ADAPTIVE-WINDOW TRANSFORM CODER, DECODER, AND ENCODER/DECODER FOR HIGH-QUALITY AUDIO

摘要

This invention relates generally to encoding and decoding digital processing of low bit rate and high quality information corresponding to audio signals such as music signals. In particular, this invention relates to the analysis / synthesis signals in encoding and decoding. The invention can optimize the compromise in transformation coders between time resolution and frequency resolution by adaptively selecting the transform length block for each sampled audio segment, and / or maximize the coding gain by selecting adaptively processing and / or by adaptively selecting the analysis window or pair of windows analysis / synthesis.