Speech encoding method and apparatus using tree-structure delta

Details Speech encoding method and apparatus using tree-structure delta Speech encoding method and apparatus using tree-structure delta

1996-12-12

1999-01-26

Tung, Kee M.

395 225, 395 232, G10L 302

Patent

active

058646507

ABSTRACT:
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.

REFERENCES:
patent: 5323486 (1994-06-01), Taniguchi et al.
patent: 5359696 (1994-10-01), Gerson et al.

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