DTMF Tones in Web Audio

Developer
Ed Ball
Size
2,938 Kb
Views
16,192
  1. DTMF Tones in Web Audio Previews
  2. DTMF Tones in Web Audio HTML Codes
  3. DTMF Tones in Web Audio CSS Codes
  4. DTMF Tones in Web Audio JS Codes

How do I make an dtmf tones in web audio?

A web audio recreation of DTMF tones for an upcoming blog post I'm writing for http://outputchannel.com. What is a dtmf tones in web audio? How do you make a dtmf tones in web audio? This script and codes were developed by Ed Ball on 12 November 2022, Saturday.

DTMF Tones in Web Audio Previews
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DTMF Tones in Web Audio - Script Codes HTML Codes

<!DOCTYPE html>
<html >
<head> <meta charset="UTF-8"> <title>DTMF Tones in Web Audio</title> <link rel="stylesheet" href="css/style.css">
</head>
<body> <div class="wrapper"> <ul class='dtmf-interface js-dtmf-interface'> <li>1</li> <li>2</li> <li>3</li> <li>4</li> <li>5</li> <li>6</li> <li>7</li> <li>8</li> <li>9</li> <li>*</li> <li>0</li> <li>#</li> </ul>
</div> <script src='http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script> <script src="js/index.js"></script>
</body>
</html>

DTMF Tones in Web Audio - Script Codes CSS Codes

@import url(https://fonts.googleapis.com/css?family=Karla:400);
body{ background: #f8f8f8; font-family:Karla, sans-serif;
}
.wrapper{	width:250px;	height:310px;	position:absolute;	left:50%;	top:50%;	margin:-155px 0 0 -125px; text-align:center;
}
.dtmf-interface{ width:250px; margin:0; padding:0; overflow:hidden;
}
.dtmf-interface li{ float:left; margin:10px; list-style:none; width:30px; height:30px; text-align:center; line-height:30px; font-size: 24px; border: solid 1px #333; border-radius:3px; padding:15px; transition: all 0.5s;
}
.dtmf-interface li:hover{ color: #3CD9FD; border-color:#3CD9FD; transition-duration:0s; cursor:pointer;
}
.dtmf-interface li:active{ color: #F60; border-color:#F60; transition-duration:0s;
}

DTMF Tones in Web Audio - Script Codes JS Codes

// polyfill
var AudioContext = window.AudioContext || window.webkitAudioContext || window.mozAudioContext;
function Tone(context, freq1, freq2) {	this.context = context;	this.status = 0;	this.freq1 = freq1;	this.freq2 = freq2;
}
Tone.prototype.setup = function(){	this.osc1 = context.createOscillator();	this.osc2 = context.createOscillator();	this.osc1.frequency.value = this.freq1;	this.osc2.frequency.value = this.freq2;	this.gainNode = this.context.createGain();	this.gainNode.gain.value = 0.25;	this.filter = this.context.createBiquadFilter();	this.filter.type = "lowpass";	this.filter.frequency = 8000;	this.osc1.connect(this.gainNode);	this.osc2.connect(this.gainNode);	this.gainNode.connect(this.filter);	this.filter.connect(context.destination);
}
Tone.prototype.start = function(){	this.setup();	this.osc1.start(0);	this.osc2.start(0);	this.status = 1;
}
Tone.prototype.stop = function(){	this.osc1.stop(0);	this.osc2.stop(0);	this.status = 0;
}
var dtmfFrequencies = {	"1": {f1: 697, f2: 1209},	"2": {f1: 697, f2: 1336},	"3": {f1: 697, f2: 1477},	"4": {f1: 770, f2: 1209},	"5": {f1: 770, f2: 1336},	"6": {f1: 770, f2: 1477},	"7": {f1: 852, f2: 1209},	"8": {f1: 852, f2: 1336},	"9": {f1: 852, f2: 1477},	"*": {f1: 941, f2: 1209},	"0": {f1: 941, f2: 1336},	"#": {f1: 941, f2: 1477}
}
var context = new AudioContext();
// Create a new Tone instace. (We've initialised it with
// frequencies of 350 and 440 but it doesn't really matter
// what we choose because we will be changing them in the
// function below)
var dtmf = new Tone(context, 350, 440);
$(".js-dtmf-interface li").on("mousedown touchstart", function(e){	e.preventDefault();	var keyPressed = $(this).html(); // this gets the number/character that was pressed	var frequencyPair = dtmfFrequencies[keyPressed]; // this looks up which frequency pair we need	// this sets the freq1 and freq2 properties	dtmf.freq1 = frequencyPair.f1;	dtmf.freq2 = frequencyPair.f2;	if (dtmf.status == 0){	dtmf.start();	}
});
// we detect the mouseup event on the window tag as opposed to the li
// tag because otherwise if we release the mouse when not over a button,
// the tone will remain playing
$(window).on("mouseup touchend", function(){	if (typeof dtmf !== "undefined" && dtmf.status){	dtmf.stop();	}
});
DTMF Tones in Web Audio - Script Codes
DTMF Tones in Web Audio - Script Codes
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Developer Ed Ball
Username edball
Uploaded November 12, 2022
Rating 3
Size 2,938 Kb
Views 16,192
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