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Related Experiment Videos

Quad-band excitation for low bit rate speech coding

K M Chiu1, P C Ching

  • 1Department of Electronic Engineering, Chinese University of Hong Kong, Shatin, N.T.

The Journal of the Acoustical Society of America
|April 1, 1996
PubMed
Summary

This study introduces a quad-band excitation (QBE) method for speech synthesis, using four frequency bands to model complex vocalizations. This approach improves the representation of mixed voicing and noisy speech for efficient, low bit-rate transmission.

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Area of Science:

  • Speech processing
  • Digital signal processing
  • Acoustics

Background:

  • Multiband excitation models are crucial for speech production.
  • Existing models require detailed voiced/unvoiced (v/uv) decisions across many frequency bands.
  • Representing mixed voicing and noisy speech remains a challenge.

Purpose of the Study:

  • To develop a more efficient multiband excitation model for speech synthesis.
  • To investigate the adequacy of a limited number of frequency bands for excitation spectrum representation.
  • To improve the modeling of mixed voicing and noisy speech signals.

Main Methods:

  • A quad-band excitation (QBE) method was developed.
  • The QBE method utilizes four variable-length, nonoverlapping frequency bands within the telephone bandwidth.

Related Experiment Videos

  • Excitation sources were generated for a linear prediction vocoder.

    • Main Results:

    • It was demonstrated that at most four v/uv bands are sufficient to represent the excitation spectrum.
    • The QBE method effectively models mixed voicing and noisy speech.
    • The proposed method is suitable for low bit-rate speech signal transmission.

    Conclusions:

    • The quad-band excitation (QBE) method provides an improved and efficient approach to speech synthesis.
    • QBE is effective for representing complex excitation spectra, including mixed voicing and noisy conditions.
    • The method's potential is validated by Diagnostic Rhyme Test (DRT) scores, confirming its utility for low bit-rate speech transmission.