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Related Experiment Videos

Replacing tracheoesophageal voicing sources using LPC synthesis.

Y Y Qi1

  • 1Department of Speech and Hearing Sciences, University of Arizona, Tucson 85721.

The Journal of the Acoustical Society of America
|September 1, 1990
PubMed
Summary

Linear predictive coding (LPC) successfully synthesized tracheoesophageal speech vowels, improving intelligibility and speaker gender identification. This technique offers a promising method for enhancing speech for individuals with voice loss.

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Area of Science:

  • Speech Science
  • Biomedical Engineering
  • Acoustic Analysis

Background:

  • Tracheoesophageal (TE) speech is an alaryngeal speech method used by individuals who have undergone a total laryngectomy.
  • Current TE speech often lacks naturalness and intelligibility due to limitations in voicing source replacement.
  • Linear predictive coding (LPC) is a signal processing technique used for modeling the vocal tract.

Purpose of the Study:

  • To investigate the feasibility of using Linear Predictive Coding (LPC) to synthesize voicing sources for tracheoesophageal (TE) speech.
  • To evaluate the intelligibility and speaker characteristics of synthesized TE vowels compared to original recordings.

Main Methods:

  • Analysis of four vowels ([i], [a], [e], [u]) and one diphthong ([ou]) produced by four TE speakers (2 male, 2 female) using the LPC autocorrelation method.

Related Experiment Videos

  • Selection of vocal tract transfer function poles based on minimum normalized prediction error and criteria from normally produced vowels.
  • Synthesis of vowels using reconstructed transfer functions and artificial excitation signals.

    • Main Results:

    • Synthesized TE vowels demonstrated high intelligibility in an identification task.
    • Speaker gender identification was significantly better from the synthesized vowels than from the original TE vowels.
    • The LPC technique effectively captured and reconstructed key speech characteristics.

    Conclusions:

    • Linear predictive coding is a feasible and effective technique for synthesizing voicing sources in tracheoesophageal speech.
    • Synthesized TE speech using LPC shows potential for improving both intelligibility and speaker identification.
    • This approach offers a promising avenue for enhancing communication for alaryngeal speakers.