发明名称 |
Code-excited linear predictive coder and decoder with conversion filter for converting stochastic and impulse excitation signals |
摘要 |
<p>A code-excited linear predictive coder or decoder for a speech signal has an adaptive codebook (105), a stochastic codebook (106), and a pulse codebook (107). A constant excitation signal (ec) is obtained by choosing between a stochastic excitation signal (es) selected from the stochastic codebook and an impulsive excitation signal (ep) selected from the pulse codebook. The constant excitation signal is filtered to produce a varied excitation signal more closely resembling the original speech signal. The varied excitation signal is combined with an adaptive excitation signal (ea) selected from the adaptive codebook to produce a final excitation signal (e) which is filtered to generate a synthesized speech signal. The final excitation signal (e) is also used to update the adaptive codebook. <IMAGE></p> |
申请公布号 |
EP0714089(A2) |
申请公布日期 |
1996.05.29 |
申请号 |
EP19950118092 |
申请日期 |
1995.11.16 |
申请人 |
OKI ELECTRIC INDUSTRY CO., LTD. |
发明人 |
AOYAGI, HIROMI;ARIYAMA, YOSHIHIRO;HOSODA, KENICHIRO |
分类号 |
G10L19/08;G10L19/00;G10L19/04;G10L19/10;G10L19/12;G10L19/14;(IPC1-7):G10L9/14 |
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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