voice-activity-detection

Syntax

vad(audioContext, stream [, options]);

Default options:

{
  fftSize: 1024,
  bufferLen: 1024,
  smoothingTimeConstant: 0.2,
  minCaptureFreq: 85,         // in Hz
  maxCaptureFreq: 255,        // in Hz
  noiseCaptureDuration: 1000, // in ms
  minNoiseLevel: 0.3,         // from 0 to 1
  maxNoiseLevel: 0.7,         // from 0 to 1
  avgNoiseMultiplier: 1.2,
  onVoiceStart: function() {},
  onVoiceStop: function() {},
  onUpdate: function(val) {}
}

• minCaptureFreq/maxCaptureFreq - human voice frequency range
• noiseCaptureDuration - time for measuring average env. noise before starting voice activity detection
• minNoiseLevel/maxNoiseLevel - env. noise level normalization range (during noiseCaptureDuration)
• avgNoiseMultiplier - multiplier for the average env. noise level to set activity/inactivity state toggle

Usage

See example code

Test

npm run test