The use of low-frequency ultrasound for voice activity detection

  title={The use of low-frequency ultrasound for voice activity detection},
  author={Ian Vince McLoughlin},
An active detection system is developed which uses low-power low-frequency ultrasonic reflection to determine the lip state (i.e. whether open, closed or in between) of a human speaker and hence the presence of vocal activity. In operation, a small loudspeaker or sounder, located within a few centimetres of the lips, produces an excitation signal which is emitted towards the lips. A co-located microphone receives the signal reflected from the lip region. Even simple analysis of the reflected… CONTINUE READING
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Voice Replacement for the Severely Speech Impaired through Sub-Ultrasonic Excitation of the Vocal Tract

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