发明授权
- 专利标题: Speech coding apparatus
- 专利标题(中): 语音编码设备
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申请号: US508553申请日: 1990-04-13
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公开(公告)号: US5138662A公开(公告)日: 1992-08-11
- 发明人: Fumio Amano , Tomohiko Taniguchi , Yoshinori Tanaka , Yasuji Ota , Shigeyuki Unagami
- 申请人: Fumio Amano , Tomohiko Taniguchi , Yoshinori Tanaka , Yasuji Ota , Shigeyuki Unagami
- 申请人地址: JPX Kawasaki
- 专利权人: Fujitsu Limited
- 当前专利权人: Fujitsu Limited
- 当前专利权人地址: JPX Kawasaki
- 优先权: JPX1-093568 19890413
- 主分类号: G10L19/00
- IPC分类号: G10L19/00 ; G10L19/12 ; H03M7/30
摘要:
A speech coding apparatus which selects an optimum code from a code book, the optimum code giving the minimum magnitude of error signal between the input signal and the reproduced signal obtained by a filter calculation using a linear prediction parameter from a linear predictive analysis unit with respect to the codes of the code book, wherein the code book is formed by thinning to 1/M (M being an integer of two or more) the plurality of sampling values constituting the codes. To compensate for the deterioration of the quality of the reproduced signal caused by thinning the sampling values in this way, an additional linear predictive analysis unit is further introduced and use made of an amended linear prediction parameter instead of the linear prediction parameter from the originally provided linear predictive analysis unit.
公开/授权文献
- US5619555A Graphical computer interface for an audio conferencing system 公开/授权日:1997-04-08