发明名称 |
Silence editing speech processor |
摘要 |
In an ADPCM system, improved detection of silence intervals in a speech signal is attained by detecting the level of the logarithm step-size signal (dn), which is representative of the energy of the speech samples. A speech pattern is converted into a sequence of adaptive digital codes. Intervals of silence in the pattern are detected and a digital code representative of each silence interval is generated. The adaptive digital codes and the silence interval codes are combined to form a digitally coded signal representative of the pattern. The conversion of the pattern to adaptive digital codes includes forming a signal corresponding to the adaptation step-size for each digital code. The silence interval detection includes producing first and second threshold signals. A silence interval signal is initiated when the adaptation step-size corresponding signal diminishes below the first threshold and the silence interval is terminated when the adaptation step-size corresponding signal increases above the second threshold after the silence interval initiation.
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申请公布号 |
US4449190(A) |
申请公布日期 |
1984.05.15 |
申请号 |
US19820343238 |
申请日期 |
1982.01.27 |
申请人 |
BELL TELEPHONE LABORATORIES, INCORPORATED |
发明人 |
FLANAGAN, JAMES L.;JOHNSTON, JAMES D. |
分类号 |
G10L11/02;H04B14/06;(IPC1-7):G10L1/00 |
主分类号 |
G10L11/02 |
代理机构 |
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地址 |
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