This paper proposes a new speech coding method called PSI-CELP (Pitch Synchronous Innovation CELP). This method is based on CELP, but adds pitch synchronous innovation, which means that even random codevectors are adoptively converted to have pitch periodicity for voiced frames. In addition, this paper also proposes four other methods: (a) an FIR-type perceptual weighting filter using unquantized LPC parameters, (b) a fixed codebook that is prepared as part of the adaptive codebook for nonperiodic frames, (c) a random codebook which consists of two conjugate sub-codebooks, and (d) codebook searches using delayed decision. Due to these methods, SNR and subjective quality are significantly improved. These basic methods were adopted in the standard CODEC for Japanese half-rate digital mobile telephone service.
|出版ステータス||Published - 1993|
|イベント||3rd European Conference on Speech Communication and Technology, EUROSPEECH 1993 - Berlin, Germany|
継続期間: 1993 9月 22 → 1993 9月 25
|Conference||3rd European Conference on Speech Communication and Technology, EUROSPEECH 1993|
|Period||93/9/22 → 93/9/25|
ASJC Scopus subject areas
- コンピュータ サイエンスの応用