SPEECH ENCODER, SPEECH DECODER, SPEECH ENCODING METHOD, AND SPEECH DECODING METHOD

摘要

A speech encoder(10)comprises a speech analyzing unit(110),a vocal−tract parameter discontinuous point detecting unit(120),a frame thinning unit(130),and a code generating unit(140).The frame−thinning unit(130)thins every other frames other than the frames including a phoneme boundary or adjoining a phoneme boundary if the frames are in a consonant section or thins one frame including a phoneme boundary or adjoining it,one frame adjoining the thinned frame including a phoneme boundary or adjoining it and included in a vowel,syllabic nasal,or long vowel section,one frame including the time point of 1/2 of the time length of the phoneme section,one frame including a discontinuous point of a vocal−tract parameter,and one frame other than the one immediately after or before the thinned frame including a discontinuous point of a vocal−tract parameter,if the frames are in a vowel,syllabic nasal,or long vowel section.