发明名称 |
Variable rate speech coding method and decoding method |
摘要 |
<p>In a variable rate speech coding method for a CELP speech coding system, an adaptive sound source vector and a first noise source vector are selected from a sound source code book and a noise source code book so that a first synthesized speech signal is obtained which has a minimum distortion relative to an input speech signal. A virtual reference speech signal is generated using a sound source signal which is produced using the adaptive sound source vector. A second noise source vector corresponding to the adaptive sound source vector is selected so that a second synthesized speech signal is obtained which has a minimum distortion relative to the virtual reference speech signal. The sending of a noise source code book index corresponding to the first noise source vector is suspended according to the quality of the second synthesized speech signal. <IMAGE></p> |
申请公布号 |
EP0863500(A2) |
申请公布日期 |
1998.09.09 |
申请号 |
EP19970118865 |
申请日期 |
1997.10.30 |
申请人 |
MITSUBISHI DENKI KABUSHIKI KAISHA |
发明人 |
MATSUOKA, BUNKEI |
分类号 |
G10L19/08;G10L19/00;G10L19/04;G10L19/14;H03M7/30;H04B14/04;(IPC1-7):G10L3/02 |
主分类号 |
G10L19/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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