发明授权
- 专利标题: Pitch detection for use in a predictive speech coder
- 专利标题(中): 用于预测语音编码器的音高检测
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申请号: US155459申请日: 1988-02-12
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公开(公告)号: US4924508A公开(公告)日: 1990-05-08
- 发明人: Hubert Crepy , Philippe Elie , Claude Galand , Emmanuel Lancon , Thierry Liethoudt , Michele Rosso
- 申请人: Hubert Crepy , Philippe Elie , Claude Galand , Emmanuel Lancon , Thierry Liethoudt , Michele Rosso
- 申请人地址: NY Armonk
- 专利权人: International Business Machines
- 当前专利权人: International Business Machines
- 当前专利权人地址: NY Armonk
- 优先权: FRX87430006 19870503
- 主分类号: G01H3/04
- IPC分类号: G01H3/04 ; G10L19/08
摘要:
A pitch detector to adjust long term prediction in a pulse excitation speech coder. A residual signal r(n) is first derived from the speech signal s(n) by short term filtering. Then, r(n) is processed to calculate a prediction error signal e(n) which is subsequently pulse excitation encoded. The processing of e(n) entails prediction of a residual by measuring a pitch related factor M, employing two steps. First calculating a coarse M value through peak clipping and sign transition detection, and then adjusting the M value by autocorrelation--calculations about the roughly spaced peaks.
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