Patent ID: 6496796
Filing Date: 2002-12-17
Classification: G10L

Abstract:
A voice coding apparatus comprising:drive sound source coding means, gain coding means, and spectrum envelope information coding means, said voice coding apparatus separating an input voice into spectrum envelope information and a sound source to code the spectrum envelope information and the sound source for each predetermined-length section called a frame, wherein said spectrum envelope information coding means codes the spectrum envelope information of the input voice, said drive sound source coding means comprises; a plurality of algebraic sound source coding means having sound source position tables different in distribution lean of sound source position candidates in a frame, each algebraic sound source coding means for referencing the spectrum envelope information and coding the sound source of the input voice based on a drive sound source position selected from among the sound source position candidates in the sound source position table and a polarity, and selection means for selecting said algebraic sound source coding means with the smallest coding distortion from among said plurality of algebraic sound source coding means, and outputting selection information, code representing said drive sound source position output by said selected algebraic sound source coding means and polarity, and said gain coding means selects gain code based on said drive sound source and the spectrum envelope information.