CODE BOOK

PROBLEM TO BE SOLVED: To reduce capacity of an incorporated memory without so much increasing an operation amount by performing operation processing for the waveform data read out from a memory means with an operation processing means and outputting as a code vector. SOLUTION: A Gauss distribution waveform code book 30 is awaited as a table ROM. A coefficient processing part 31 adds coefficients of addition/ subtraction to patterns read out from the Gauss distribution waveform code book 30, and an addition part 32 assembles them. The vector taken out from the Gauss distribution waveform code book 30 and the vector taken out from an adaptive code book 21 are multiplied respectively by gains in gain control parts 18, 20, and after they are added by the addition part 19 to become a reproducing voice through a synthetic filter 15 and to be added to a difference part 16. Thus, by using this Gauss distribution waveform code book 30 to a voice coder of a CELP(code excited linear predictive coding) system, memory capacity is reduced.