Speech coding system

Details Speech coding system Speech coding system

G - Physics

10

L

G10L 19/12 (2006.01) G10L 19/00 (2006.01)

Patent

CA 2068526

A voice coding system which finds by evaluation operation a code vector that minimizes the error between an input voice signal and a repro- duced signal obtained through a linear estimation synthesis filtering simu- lating the vocal tract characteristics for each of the code vectors successivelyread out from a code book that stores a plurality of noise sequences as code vectors (C0, C1, C2 .....), and then encodes the input voice signal by using a code which specifies a code vector. The code book is constituted as a delta vector code book (11) that stores the initial vector (C0) and a plu- rality of delta vectors (.DELTA.Ci) which consist of differential vectors among the neighboring code vectors. Operation means for the evaluation operation is provided with a cyclic adder means (20) which accumulates delta vectors for virtual reproduction of said code vectors (C0, C1, C2, .....).

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