9_Envelopes.html


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<html><head>
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<title>
	Javascript Audio Processing
</title>

<!-- <link rel="stylesheet" type="text/css" href="javascript-processing_files/simple.css"> -->

<script src="../maxiLib.js"></script>
<!-- <script src="../maxi_webAudio.js"></script> -->

<!-- Our javascript code -->
<script type="text/javascript">

var myCounter = new maximJs.maxiOsc(); //these oscillators will help us count and play sound
var mySwitchableOsc = new maximJs.maxiOsc();//

var CurrentCount;//
var myOscOutput,myCurrentVolume;//

var myEnvelope = new maximJs.maxiEnv();

// unfortunately, '.get(n)' must be used to access vector data
// or the data can be used as an array and the GetArray... function used when required
// var myEnvelopeData = GetArrayAsVectorDbl([1,0,0,500]);//this data will be used to make an envelope. Value and time to value in ms.

function setup(){
    //Timing is in ms
    myEnvelope.setAttack(0);
    myEnvelope.setDecay(1);  // Needs to be at least 1
    myEnvelope.setSustain(1);
    myEnvelope.setRelease(1000);
}

function play(){

    //notice that we feed in a value of 1. to create an envelope shape we can apply later.
    myCurrentVolume=myEnvelope.adsr(1.,myEnvelope.trigger);
    
    CurrentCount=Math.round(myCounter.phasor(1, 1, 9));//phasor can take three arguments; frequency, start value and end value.
    
    // You'll notice that these 'if' statements don't require curly braces "{}".
    // This is because there is only one outcome if the statement is true.
    
    if (CurrentCount==1){
     myEnvelope.trigger=1; //trigger the envelope
 }
 else { 
    myEnvelope.trigger=0;//release the envelope to make it fade out only if it's been triggered

}

if (CurrentCount<5){

	myOscOutput=mySwitchableOsc.sawn(CurrentCount*100);
}
    else if (CurrentCount>=5) {//and the 'else' bit.

        myOscOutput=mySwitchableOsc.sinewave(CurrentCount*50);//one osc object can produce whichever waveform you want.
    }
    
    output=myOscOutput*myCurrentVolume;//left speaker
}


</script>

</head>

<body>

	<h1> Envelope Example </h1>

	<p>

	</p>
</body></html>