An LPC vocoder based on phase-equalized pitch waveform

Yusuke Hiwasaki, Kazunori Mano, Takao Kaneko

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This paper presents a speech coder operating at a very low bit-rate using a model called "phase-equalized pitch waveform". The basic idea of the coder is to employ pitchwise extraction of the linear predictive residual signal, a pitch waveform, in voiced speech. The residual signal is processed with a phase-equalization filter to increase the efficiency of both the pitch waveform quantization and interpolation. Listening tests showed that efficient and high-quality coding is achieved at 2.0 kbits/s. The quality of the coder is equal to that of the DoD FS1016 standard CELP at 4.8 or 2.4 kbits/s MELP.

Original languageEnglish
Pages (from-to)277-290
Number of pages14
JournalSpeech Communication
Volume40
Issue number3
DOIs
Publication statusPublished - 2003 May
Externally publishedYes

Fingerprint

Waveform
coding
Interpolation
Equalization
efficiency
Quantization
Coding
Interpolate
Filter
Speech
Model
Standards

Keywords

  • LPC vocoder
  • Phase equalization
  • Pitch waveform
  • Speech coding
  • Vector quantization

ASJC Scopus subject areas

  • Signal Processing
  • Electrical and Electronic Engineering
  • Experimental and Cognitive Psychology
  • Linguistics and Language

Cite this

An LPC vocoder based on phase-equalized pitch waveform. / Hiwasaki, Yusuke; Mano, Kazunori; Kaneko, Takao.

In: Speech Communication, Vol. 40, No. 3, 05.2003, p. 277-290.

Research output: Contribution to journalArticle

Hiwasaki, Yusuke ; Mano, Kazunori ; Kaneko, Takao. / An LPC vocoder based on phase-equalized pitch waveform. In: Speech Communication. 2003 ; Vol. 40, No. 3. pp. 277-290.
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