Initial data commit

Task/Morse-code/JavaScript/morse-code-1.js

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+var globalAudioContext = new webkitAudioContext();
+
+function morsecode(text, unit, freq) {
+	'use strict';
+
+	// defaults
+	unit = unit ? unit : 0.05;
+	freq = freq ? freq : 700;
+	var cont = globalAudioContext;
+	var time = cont.currentTime;
+
+	// morsecode
+	var code = {
+		a: '._',    b: '_...',  c: '_._.',  d: '_..',   e: '.',     f: '.._.',
+		g: '__.',   h: '....',  i: '..',    j: '.___',  k: '_._',   l: '._..',
+		m: '__',    n: '_.',    o: '___',   p: '.__.',  q: '__._',  r: '._.',
+		s: '...',   t: '_',     u: '.._',   v: '..._',  w: '.__',   x: '_.._',
+		y: '_.__',  z: '__..',  0: '_____', 1: '.____', 2: '..___', 3: '...__',
+		4: '...._', 5: '.....', 6: '_....', 7: '__...', 8: '___..', 9: '____.'
+	};
+
+	// generate code for text
+	function makecode(data) {
+		for (var i = 0; i <= data.length; i ++) {
+			var codedata = data.substr(i, 1).toLowerCase();
+			codedata = code[codedata];
+			// recognised character
+			if (codedata !== undefined) {
+				maketime(codedata);
+			}
+			// unrecognised character
+			else {
+				time += unit * 7;
+			}
+		}
+	}
+
+	// generate time for code
+	function maketime(data) {
+		for (var i = 0; i <= data.length; i ++) {
+			var timedata = data.substr(i, 1);
+			timedata = (timedata === '.') ? 1 : (timedata === '_') ? 3 : 0;
+			timedata *= unit;
+			if (timedata > 0) {
+				maketone(timedata);
+				time += timedata;
+				// tone gap
+				time += unit * 1;
+			}
+		}
+		// char gap
+		time += unit * 2;
+	}
+
+	// generate tone for time
+	function maketone(data) {
+		var start = time;
+		var stop = time + data;
+		// filter: envelope the tone slightly
+		gain.gain.linearRampToValueAtTime(0, start);
+		gain.gain.linearRampToValueAtTime(1, start + (unit / 8));
+		gain.gain.linearRampToValueAtTime(1, stop - (unit / 16));
+		gain.gain.linearRampToValueAtTime(0, stop);
+	}
+
+	// create: oscillator, gain, destination
+	var osci = cont.createOscillator();
+	osci.frequency.value = freq;
+	var gain = cont.createGainNode();
+	gain.gain.value = 0;
+	var dest = cont.destination;
+	// connect: oscillator -> gain -> destination
+	osci.connect(gain);
+	gain.connect(dest);
+	// start oscillator
+	osci.start(time);
+
+	// begin encoding: text -> code -> time -> tone
+	makecode(text);
+
+	// return web audio context for reuse / control
+	return cont;
+}

Task/Morse-code/JavaScript/morse-code-2.js

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+morsecode('Hello World');