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Envelope expansion methods for speech enhancement.

P M Clarkson1, S F Bahgat

  • 1Electrical and Computer Engineering Department, Illinois Institute of Technology, Chicago 60616.

The Journal of the Acoustical Society of America
|March 1, 1991
PubMed
Summary
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This study introduces a novel speech enhancement method using nonlinear spectral envelope expansion. The technique improves speech intelligibility and articulation scores, offering a promising advancement in digital signal processing.

Area of Science:

  • Digital Signal Processing
  • Acoustics
  • Speech Technology

Background:

  • Growing interest in digital speech signal enhancement over the past decade.
  • Existing methods achieve gains in signal-to-noise ratio (SNR) and quality, but rarely improve intelligibility.
  • Need for advanced speech enhancement techniques that boost clarity and comprehension.

Purpose of the Study:

  • To present a new speech enhancement algorithm based on nonlinear expansion of the spectral envelope.
  • To evaluate the algorithm's effectiveness in improving speech intelligibility.
  • To compare the proposed method against established techniques like spectral subtraction.

Main Methods:

  • Developed a speech enhancement algorithm utilizing nonlinear expansion of the spectral envelope.

Related Experiment Videos

  • Ensured the expansion aligns with long-term speech spectrum and speech presence probability.
  • Implemented a simplified real-time version on a Texas Instruments TMS320-C25 system for listening trials.

    • Main Results:

    • Objective SNR measures demonstrated the algorithm's performance compared to spectral subtraction and other schemes.
    • Listening trials using a modified rhyme test were conducted with the real-time system.
    • Small but consistent improvements in articulation scores were observed, indicating enhanced intelligibility.

    Conclusions:

    • The proposed nonlinear spectral envelope expansion method offers a viable approach for speech enhancement.
    • The technique shows potential for improving speech intelligibility, as evidenced by articulation score gains.
    • Further development and application of this method could significantly advance digital speech processing.