发明授权
US5864650A Speech encoding method and apparatus using tree-structure delta code book
失效
语音编码方法和装置使用树结构三角码书
- 专利标题: Speech encoding method and apparatus using tree-structure delta code book
- 专利标题(中): 语音编码方法和装置使用树结构三角码书
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申请号: US762694申请日: 1996-12-12
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公开(公告)号: US5864650A公开(公告)日: 1999-01-26
- 发明人: Tomohiko Taniguchi , Yoshinori Tanaka , Yasuji Ohta , Hideaki Kurihara
- 申请人: Tomohiko Taniguchi , Yoshinori Tanaka , Yasuji Ohta , Hideaki Kurihara
- 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: JPX4-246491 19920916
- 主分类号: G10L19/00
- IPC分类号: G10L19/00 ; G10L19/04 ; G10L3/02
摘要:
A larger number, L', of delta vectors .DELTA..sub.i (i=0, 1, 2, . . . , L'-1) than the required number L are each multiplied by a matrix of a linear predictive synthesis filter (3), their power (A.DELTA..sub.i).sup.T (A.DELTA..sub.i) is evaluated (42), and the delta vectors are reordered in decreasing order of power (43); then, L delta vectors are selected in decreasing order of power, the largest power first, to construct a tree-structure data code book (41), using which A-b-S vector quantization is performed (48). This provides increased freedom for the space formed by the delta vectors and improves quantization characteristics. Further, variable rate encoding is achieved by taking advantage of the structure of the tree-structure data code book.
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