updated noise capture logic

README.md

@@ -11,8 +11,8 @@
   smoothingTimeConstant: 0.2,
   minCaptureFreq: 85,         // in Hz
   maxCaptureFreq: 255,        // in Hz
-  noiseCaptureDuration: 0,    // in ms
-  minNoiseLevel: 0.4,         // from 0 to 1
+  noiseCaptureDuration: 1000, // in ms
+  minNoiseLevel: 0.3,         // from 0 to 1
   maxNoiseLevel: 0.7,         // from 0 to 1
   avgNoiseMultiplier: 1.2,
   onVoiceStart: function() {},
@@ -30,4 +30,4 @@
 See [example code](https://github.com/Jam3/voice-activity-detection/blob/master/test/test.js)
 
 ## Test
-```npm start```
+```npm run test```

index.js

@@ -1,5 +1,4 @@
 'use strict';
-
 var analyserFrequency = require('analyser-frequency-average');
 
 module.exports = function(audioContext, stream, opts) {
@@ -12,13 +11,16 @@ module.exports = function(audioContext, stream, opts) {
     smoothingTimeConstant: 0.2,
     minCaptureFreq: 85,         // in Hz
     maxCaptureFreq: 255,        // in Hz
-    noiseCaptureDuration: 0,    // in ms
-    minNoiseLevel: 0.4,         // from 0 to 1
+    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) {}
+    onVoiceStart: function() {
+    },
+    onVoiceStop: function() {
+    },
+    onUpdate: function(val) {
+    }
   };
 
   var options = {};
@@ -27,6 +29,7 @@ module.exports = function(audioContext, stream, opts) {
   }
 
   var baseLevel = 0;
+  var voiceScale = 1;
   var activityCounter = 0;
   var activityCounterMin = 0;
   var activityCounterMax = 60;
@@ -56,13 +59,16 @@ module.exports = function(audioContext, stream, opts) {
     //console.log('VAD: stop noise capturing');
     isNoiseCapturing = false;
 
-    var averageEnvFreq = (envFreqRange.reduce(function(p, c) {
-        return p + c;
-      }, 0) / envFreqRange.length) || 0;
+    envFreqRange = envFreqRange.filter(function(val) {
+      return val;
+    }).sort();
+    var averageEnvFreq = envFreqRange.length ? envFreqRange.reduce((p, c) => Math.min(p, c), 1) : (options.minNoiseLevel || 0.1);
 
     baseLevel = averageEnvFreq * options.avgNoiseMultiplier;
-    if (baseLevel < options.minNoiseLevel) baseLevel = options.minNoiseLevel;
-    if (baseLevel > options.maxNoiseLevel) baseLevel = options.maxNoiseLevel;
+    if (options.minNoiseLevel && baseLevel < options.minNoiseLevel) baseLevel = options.minNoiseLevel;
+    if (options.maxNoiseLevel && baseLevel > options.maxNoiseLevel) baseLevel = options.maxNoiseLevel;
+
+    voiceScale = 1 - baseLevel;
 
     //console.log('VAD: base level:', baseLevel);
   }
@@ -104,7 +110,7 @@ module.exports = function(audioContext, stream, opts) {
       prevVadState = vadState;
     }
 
-    options.onUpdate(average);
+    options.onUpdate(Math.max(0, average - baseLevel) / voiceScale);
   }
 
   function onVoiceStart() {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "voice-activity-detection",
-  "version": "0.0.2",
+  "version": "0.0.3",
   "description": "Mic input activity detection",
   "main": "index.js",
   "license": "MIT",
@@ -16,7 +16,7 @@
     "budo": "^9.2.1"
   },
   "scripts": {
-    "start": "budo test/test.js --live"
+    "test": "budo test/test.js --live"
   },
   "keywords": [
     "voice",

test/test.js

@@ -1,6 +1,12 @@
 var vad = require('../index.js');
 var audioContext;
 
+var valueContainer = document.createElement('div');
+document.body.appendChild(valueContainer);
+
+var stateContainer = document.createElement('div');
+document.body.appendChild(stateContainer);
+
 requestMic();
 
 function requestMic() {
@@ -27,12 +33,15 @@ function startUserMedia(stream) {
   var options = {
     onVoiceStart: function() {
       console.log('voice start');
+      stateContainer.innerHTML = 'Voice state: <strong>active</strong>';
     },
     onVoiceStop: function() {
       console.log('voice stop');
+      stateContainer.innerHTML = 'Voice state: <strong>inactive</strong>';
     },
     onUpdate: function(val) {
       //console.log('curr val:', val);
+      valueContainer.innerHTML = 'Current voice activity value: <strong>' + val + '</strong>';
     }
   };
   vad(audioContext, stream, options);