W3C home > Mailing lists > Public > public-audio@w3.org > July to September 2012

Re: [Bug 17415] (JSWorkers): JavaScriptAudioNode processing in workers

From: Chris Wilson <cwilso@google.com>
Date: Wed, 11 Jul 2012 09:41:03 -0700
Message-ID: <CAJK2wqU-gFXZdjr3kUROW=rEpsMYvPrF76WJNXs349ZsziXZ2g@mail.gmail.com>
To: bugzilla@jessica.w3.org
Cc: public-audio@w3.org
White noise doesn't benefit from the anti-aliasing done for periodic
waveforms, and it's actually quite easy to generate:

var lengthInSamples =  2 * audioContext.sampleRate;  // 2 = 2 second long
buffer.  Arbitrary.
var noiseBuffer = audioContext.createBuffer(1, lengthInSamples,
audioContext.sampleRate);
var bufferData = noiseBuffer.getChannelData(0);
for (var i = 0; i < lengthInSamples; ++i) {
    bufferData[i] = (2*Math.random() - 1.0);  // -1 to +1 range
}



On Wed, Jul 11, 2012 at 8:39 AM, <bugzilla@jessica.w3.org> wrote:

> https://www.w3.org/Bugs/Public/show_bug.cgi?id=17415
>
> --- Comment #49 from Grant Galitz <grantgalitz@gmail.com> 2012-07-11
> 15:39:09 UTC ---
> (In reply to comment #48)
> > Hi Grant,
> >
> > (In reply to comment #44)
> > > A bit off topic, but could we add nodes that generate specific
> waveforms? Like
> > > a sine/triangle/square/sawtooth/LSFR White Noise generator node?
> >
> > I think you are looking for
> >
> https://dvcs.w3.org/hg/audio/raw-file/tip/webaudio/specification.html#Oscillator
> >
> > Ideally, if you have any comment not related to a specific issue,
> discussion on
> > public-audio@w3.org is a better idea than hijacking the comment thread
> ;)
>
> Oh wow, I never noticed you had that implemented already. I'm wondering
> where
> the white noise osc is?
>
> --
> Configure bugmail: https://www.w3.org/Bugs/Public/userprefs.cgi?tab=email
> ------- You are receiving this mail because: -------
> You are on the CC list for the bug.
>
>
Received on Wednesday, 11 July 2012 16:41:37 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Wednesday, 11 July 2012 16:41:38 GMT