Pitch Synchronous Innovation CELP (PSI-CELP)

Satoshi Miki, Kazunori Mano, Hitoshi Ohmuro, Takehiro Moriya

Research output: Contribution to conferencePaperpeer-review

14 Citations (Scopus)


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.

Original languageEnglish
Number of pages4
Publication statusPublished - 1993
Externally publishedYes
Event3rd European Conference on Speech Communication and Technology, EUROSPEECH 1993 - Berlin, Germany
Duration: 1993 Sept 221993 Sept 25


Conference3rd European Conference on Speech Communication and Technology, EUROSPEECH 1993


  • CELP
  • Low bit-rate
  • Mobile telephone
  • Pitch synchronous innovation
  • Random codebook
  • Speech coding

ASJC Scopus subject areas

  • Software
  • Linguistics and Language
  • Computer Science Applications
  • Communication


Dive into the research topics of 'Pitch Synchronous Innovation CELP (PSI-CELP)'. Together they form a unique fingerprint.

Cite this