New algorithms for sinusoidal speech coding at low bit rates

S. Ahmadi, Andreas Spanias

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper addresses the design, development, evaluation, and implementation of efficient low bit rate speech coding algorithms based on the sinusoidal model. A series of algorithms have been developed for pitch frequency determination and voicing detection, simultaneous modeling of the sinusoidal amplitudes and phases, and mid-frame interpolation. An improved sinusoidal phase matching algorithm is presented, where short-time sinusoidal phases are approximated using an elaborate combination of linear prediction, spectral sampling, delay compensation, and phase correction techniques. A voicing-dependent perceptual split vector quantization scheme is used to encode the sinusoidal amplitudes. The perceptual properties of the human auditory system are effectively exploited in the developed algorithms. The algorithms have been successfully integrated into a 2.4 kbps sinusoidal coder. The performance of the 2.4 kbps coder has been evaluated in terms of subjective tests such as the mean opinion score and the diagnostic rhyme test, as well as some perceptually-motivated objective distortion measures. Performance analysis on a large speech database indicates that the use of the proposed algorithms resulted in considerable improvement in temporal and spectral signal matching, as well as improved subjective quality of the reproduced speech.

Original languageEnglish (US)
Title of host publicationIEEE International Conference on Personal Wireless Communications
Place of PublicationPiscataway, NJ, United States
PublisherIEEE
Pages57-61
Number of pages5
StatePublished - 1997
Externally publishedYes
EventProceedings of the 1997 IEEE International Conference on Personal Wireless Communications - Mumbai, India
Duration: Dec 17 1997Dec 19 1997

Other

OtherProceedings of the 1997 IEEE International Conference on Personal Wireless Communications
CityMumbai, India
Period12/17/9712/19/97

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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  • Cite this

    Ahmadi, S., & Spanias, A. (1997). New algorithms for sinusoidal speech coding at low bit rates. In IEEE International Conference on Personal Wireless Communications (pp. 57-61). IEEE.