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A radio controller using speech for the blind.

C L Lin1, R M Won, J J Luh

  • 1Department of Electrical Engineering, National Taiwan Univesity, Taipei, ROC.

Critical Reviews in Biomedical Engineering
|December 7, 2000
PubMed
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This study presents a low-cost, portable speech controller for the visually impaired, enabling radio control via spoken Mandarin Chinese. The system achieved high recognition rates, demonstrating its potential for assistive technology.

Area of Science:

  • Assistive Technology
  • Speech Recognition
  • Digital Signal Processing

Background:

  • Visually impaired individuals face challenges controlling electronic devices.
  • Existing assistive technologies may be costly or lack portability.
  • Speech control offers a promising avenue for enhancing accessibility.

Purpose of the Study:

  • To develop a low-cost, portable, real-time speech controller for radio interface commands.
  • To enable visually impaired users to control radio functions through spoken language.
  • To evaluate the system's performance in various acoustic conditions.

Main Methods:

  • Utilized a Digital Signal Processing (DSP) chip (TMS320C31) for real-time speech processing.
  • Implemented a hidden Markov model (HMM) for recognizing spoken Mandarin Chinese.

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  • Tested the system's functionality with radio controls (tuner, tape, CD) in noisy and noiseless environments.

    • Main Results:

    • Achieved a mean recognition rate of 83% in noisy environments.
    • Achieved a mean recognition rate of 90% in noiseless environments.
    • Demonstrated successful control of radio functions including tuner, tape, and compact disc.

    Conclusions:

    • The developed DSP-based speech controller is effective for radio interface control for the blind.
    • The system exhibits high accuracy in both noisy and noiseless conditions.
    • The DSP-based architecture allows for easy programming of speaker-independent algorithms for broader usability.