Patent Number: 7,711,555

Title: Method for compression and expansion of digital audio data

Abstract: Digital audio data are divided into a plurality of frames, each of which includes a desired number of sub-band samples, which are gradually increased in a range between "16" and "1024", and are then compressed by way of psychoacoustics analysis and quantization, whereby compressed data are realized with a high compression ratio and small tone-generation latency. The compressed data are decoded by way of inverse quantization and sub-band synthesis, so that decoded data are sequentially written into a memory (e.g., a FIFO memory). Decoding is appropriately turned on or off in response to a presently vacant capacity of the memory.

Inventors: Suzuki; Toshihiko (Hamamatsu, JP)

Assignee: Yamaha Corporation

International Classification: G10L 19/14 (20060101); G10L 19/00 (20060101); G10L 21/04 (20060101)

Expiration Date: 5/04/12018