[PD] very compressed chip sounds

tim vets timvets at gmail.com
Tue Oct 11 21:24:23 CEST 2011


7 objects arpeggiator
note that if you click the same Hradio box several times you also get
variations.
gr,
Tim

2011/10/11 Mathieu Bouchard <matju at artengine.ca>

> Le 2011-10-12 à 01:32:00, hardoff goes bananas a écrit :
>
>
>  no idea what causes the transpose/chord shift in this patch, but if you
>> leave it for a while, it inevitably does happen.
>>
>
> You are greatly amplifying error accumulation coming from [phasor~]. With a
> samplerate of exactly 44100 and a frequency of exactly 2, an ideal [phasor~]
> would increase by an amount of 2/44100 at each sample, leading to a new 0 at
> every 22050. The truth is a bit different.
>
> If you do it with regular pd floats (float32), the amount 2/44100 gets
> computed as 12466118/pow(2,15+23) instead, because that's the closest
> fraction that this format can express.
>
> For reasons of error accumulation, [phasor~] uses a «double» (float64) for
> storing the phase, but then it stores 1/44100 as a float, an computes
> 2*(1/44100) as a float too, therefore a [phasor~ 2] doesn't have the exact
> frequency of 2.
>
> BTW, have you tried [phasor~ 2.01] and other things like that ? At least on
> my computer, it's more interesting than [phasor~ 2].
>
>
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> __________
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