Generation of Music Using Pure JS and HTML5

Post by valdiorn » Mon, Sep 24, 2012, 3:21 PM UTC

Post by valdiorn » Mon, Sep 24, 2012, 3:28 PM UTC

kushsolitary wrote: post #12

valdiorn wrote: post #11

Yeah, that's MY CODE , mate. Maybe give some credit, eh? Edit: Looks like OP just borrowed my note array.. which I in turn borrowed from Aphex twin, so no harm done... :) Also, it isn't working 100% in Chrome, the sampling rate is probably wrong. You can check out my example Here: http://valdemarorn.github.com/Files/JSAudio/index.html Anyway, Riffwave was posted here yesterday, and I posted a similar example I did wi…

Yes the notes sequence and the base frequency algorithm is yours and I notified you about using it here. http://news.ycombinator.com/item?id=4561565 I am sorry for not giving credit to you on the main page. Edit: BTW, what is wrong with the sampling frequency? I think 44KHz is sufficient and it's working fine on my Chrome. A fork maybe?

Post by pacaro » Mon, Sep 24, 2012, 6:08 PM UTC

bkanber wrote: post #14

That distortion you're hearing is because of sharp changes in your signal's amplitude. To get rid of it, you should apply a little bit of smoothing to the attack and release of individual notes.

		var data = [],
			sampleRateHz = 44100,
			lengthInSeconds = 8,
			sampleCount = sampleRateHz * lengthInSeconds,

			//Notes sequence, play with it ;)
			notes = [87, 0, 87, 0, 85, 0, 82, 0, 80, 0, 82, 82, 80, 0, 82, 0, 85, 0, 78, 0, 78, 78],
			
			noteLength = sampleCount / notes.length,
			
			//Base Frequency based on the notes
			baseFreq = function(index) {
				var r = 2 * Math.PI * 220.0 * Math.pow(2,(notes[index]-69)/12.0) / sampleRateHz;
				return r;
			},
			
			envelope = function(offset, attack, decay, sustain, release) {
				if (offset