发明名称 |
Codebook structure and search for speech coding |
摘要 |
A speech compression system with a special fixed codebook structure and a new search routine is proposed for speech coding. The system is capable of encoding a speech signal into a bitstream for subsequent decoding to generate synthesized speech. The codebook structure uses a plurality of subcodebooks. Each subcodebook is designed to fit a specific group of speech signals. A better way is used to calculate a criterion value, minimizing an error signal in a minimization loop as part of the coding system. An external signal sets a maximum bitstream rate for delivering encoded speech into a communications system. The speech compression system comprises a full-rate codec, a half-rate codec, a quarter-rate codec and an eighth-rate codec. Each codec is selectively activated to encode and decode the speech signals at different bit rates to enhance overall quality of the synthesized speech at a limited average bit rate.
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申请公布号 |
US6714907(B2) |
申请公布日期 |
2004.03.30 |
申请号 |
US20010785360 |
申请日期 |
2001.02.15 |
申请人 |
MINDSPEED TECHNOLOGIES, INC. |
发明人 |
GAO YANG |
分类号 |
G10L19/00;G10L19/10;(IPC1-7):G10L19/14;G10L19/02;G10L15/10 |
主分类号 |
G10L19/00 |
代理机构 |
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