TY - CONF
T1 - Pitch Synchronous Innovation CELP (PSI-CELP)
AU - Miki, Satoshi
AU - Mano, Kazunori
AU - Ohmuro, Hitoshi
AU - Moriya, Takehiro
N1 - Funding Information:
The authors would like to thank Dr. Nobuhiko Kitawaki, Takao Kaneko, Dr. Yukio Kobayashi, and Dr. Sadaoki Furui for their helpful guidance in this research. They also would like to thank Kumiko Oguchi and Naoki Iwakami for collaborating in the quality assessment.
Publisher Copyright:
© 1993 3rd European Conference on Speech Communication and Technology, EUROSPEECH 1993. All rights reserved.
PY - 1993
Y1 - 1993
N2 - 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.
AB - 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.
KW - CELP
KW - Low bit-rate
KW - Mobile telephone
KW - Pitch synchronous innovation
KW - Random codebook
KW - Speech coding
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M3 - Paper
AN - SCOPUS:85075914501
SP - 261
EP - 264
T2 - 3rd European Conference on Speech Communication and Technology, EUROSPEECH 1993
Y2 - 22 September 1993 through 25 September 1993
ER -