| 摘要 |
PROBLEM TO BE SOLVED: To normally reproduce a multi-channel signal by a reproduction side, even when the multi-channel signal is selectively transmitted with compressing or non-compressing, and down-mixing of the reproduction side is selectively permitted, or prohibited. SOLUTION: An original multi-channel speech signal is converted to a speech signal of stereo two channels, and it is divided into a first group including the obtained stereo two channel, and a second group including other channels. At least the speech signal of channels of the second group is converted to a correlated speech signal, and predictive coding is performed for each channel. Accordingly, when predictive coding of the multi-channel speech signal is performed, a compression rate is improved, and the stereo two channel is reproduced by using only the first group. COPYRIGHT: (C)2009,JPO&INPIT
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