An iterative training method is proposed for the design of random codebooks and channel code mapping tables for a CELP coder. The method is based on a structured excitation source such as a conjugate structure, pitch isynchronization, rotation of samples, time-domain sloped gain, and code mapping to channel code. Closed-loop distortion measure, that is, perceptually weighted distortion between the input and the synthesized speech, is used in all training procedures. The training improves the SNR by around 1 dB and improves subjective quality. The channel code mapping and channel-matched distortion measure increases robustness against channel error.
|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