| 摘要 |
PROBLEM TO BE SOLVED: To improve the decoding efficiency of a reproduction side, in the case of coding multi-channel voice signals with a variable compression ratio. SOLUTION: An audio data area in an audio packet consists of a plurality of PPCM access units, and a PPCM access unit consists of PPCM sync information and a sub-packet. The PPCM sync information contains the number of samples (40, 80, or 160, according to sampling frequencies), a data rate ('0' in the case of VBR: being an identifier showing that data in the sub-packet are compressed data), the sampling frequencies fs and the number of quantized bits, Qb, and channel allocation information. |
