voice-activity-detection

Syntax

``vad(audioContext, stream [, options]);`

Default options:
`javascript
{
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``