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              <div class="wrapper">
  <div class='button' id='js-trigger-sound'>Click for night vision sound</div>
</div>
            
          
!
            
              @import url(https://fonts.googleapis.com/css?family=Karla:400);

body{
  background: #f8f8f8;
  font-family:Karla, sans-serif;
}

.wrapper{
	width:400px;
	height:100px;
	position:absolute;
	left:50%;
	top:50%;
	margin:-50px 0 0 -200px;
  text-align:center;
}

.button{
  font-size: 24px;
  border: solid 1px #333;
  width:200px;
  border-radius:3px;
  padding:15px;
  transition: all 0.5s;
  margin:0 auto 40px;
}

.button:hover{
  color: #55D43F;
  border-color:#55D43F;
  transition-duration:0s;
  cursor:pointer;
}
            
          
!
            
              // polyfill
var AudioContext = window.AudioContext || window.webkitAudioContext || window.mozAudioContext;

function NVD(context) {
  this.context = context; // the audio context
  this.downSweepTime = 0.05; // the time taken for the initial sweep 
  this.upSweepTime = 1.525; // the time taken for the second sweep 
  this.initialFrequency = 5000;
  this.lowestFrequency = 1500;
  this.finalFrequency = 2500;
  this.maxGainValue = 0.2;

  this.gainNode = context.createGain();
  this.gainNode.connect(this.context.destination);
}


NVD.prototype.play = function(time) {
  this.osc = context.createOscillator();
	this.osc.connect(this.gainNode);
  this.setOscillatorWaveform();
  this.osc.start(time)
  this.osc.frequency.setValueAtTime(this.initialFrequency, time);
  this.osc.frequency.linearRampToValueAtTime(this.lowestFrequency, time + this.downSweepTime);
  this.osc.frequency.linearRampToValueAtTime(this.finalFrequency, time + this.downSweepTime + this.upSweepTime);

  this.gainNode.gain.setValueAtTime(this.maxGainValue, time);
  this.gainNode.gain.linearRampToValueAtTime(0, time + this.downSweepTime + this.upSweepTime);

  this.osc.stop(time + this.downSweepTime + this.upSweepTime);
}

NVD.prototype.setOscillatorWaveform = function() {

  var coeffs = [
    0,
    0.010,
    0.022,
    0.007,
    0.004,
    0.004
  ];
  var real = new Float32Array(coeffs);
  var imag = new Float32Array(real.length); // creates an array of zeros.
  var wave = context.createPeriodicWave(real, imag);
  this.osc.setPeriodicWave(wave);
}

var context = new AudioContext();

$("#js-trigger-sound").click(function(e) {
  e.preventDefault();
  var nvd = new NVD(context);
  nvd.play(context.currentTime);
});
            
          
!
999px
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