Adaptive-block-length, adaptive-transforn, and adaptive-window transform coder, decoder, and encoder/decoder for high-quality audio

摘要

PCT No. PCT/US91/02512 Sec. 371 Date Dec. 11, 1991 Sec. 102(e) Date Dec. 11, 1991 PCT Filed Apr. 12, 1991 PCT Pub. No. WO91/16769 PCT Pub. Date Oct. 31, 1991.The invention relates in general to high-quality low bit-rate digital transform coding and decoding of information corresponding to audio signals such as music signals. More particularly, the invention relates to signal analysis/synthesis in coding and decoding. The invention can optimize the trade off in transform coders between time resolution and frequency resolution by adaptively selecting the transform block length for each sampled audio segment, and/or can optimize coding gain by adaptively selecting the transform and/or by adaptively selecting the analysis window or the analysis/synthesis window pair.