| 摘要 |
An apparatus for encoding voice spectrum envelop parameters forms a phoneme matrix by combining a certain number of phoneme vectors, and effects matrix quantization by using this phoneme matrix as a unit. The apparatus performs restricted time-direction deformation of an input phoneme matrix, such as by shifting, compression, or expansion in time-direction, to output a finite number of deformed phoneme matrices. The input phoneme matrix is formed by combining, in time-direction, a certain number of phoneme vectors composed of spectrum parameters representing information on the spectrum of an input voice signal. A code book is used for storing a second number of phoneme matrix code words which are compared with the deformed phoneme matrices provided by restricted time-direction deformation. The distances between the deformed phoneme matrices of the input phoneme matrix and the phoneme matrix code words, which are successively read out from the code book, are calculated. Distances calculated for each pair of deformed phoneme matrix and codebook phoneme matrix are compared and the phoneme matrix code words having the smallest distance are selected as an optimum phoneme matrix code word. The code word number of the optimum phoneme matrix code word is output from the apparatus.
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