[PD] Pitch envelope

[Andrew Faraday]

What I would do is use your typical sound playback algorithm, ([phasor~] feeding [tabread~] and relevant arithmetic. But take a side chain from the [phasor~] to another [tabread~]  via a [*~ 10000](or whatever length). and draw your pitch curve into an array (with it's length in that [*~] and with a y range of something like 0 - 2). sending the output of the second tabread back to the phasor(which should happily change it's speed sample-by-sample without losing it's position) by a multiply (from your original speed calculation.Something like...[O] |[arraysize sound] |  \ |  [s sample_length][expr 44100 / $f1] | |    [r pitch_curve]   |    /[*~]       |[phasor~] |   \ |   [s phasor] | |   [r sample_length] |   /[*~] |[tabread~ sample] |    \[dac~][r phasor] |  |   [O] |    | |   [arraysize pitch] |   /[*~] |[tabread pitch] |[s pitch_curve](I've put that together quickly and in the middle of the night, might well have made a mistake or two)Of course, while this will change the speed of playback based on the position of playback, it is very difficult to express it as musical pitch differences. setting the scope of your pitch curve to 0 - 2 means that by multiplying it by the 'correct' playback speed you can go down to no movement at all (which will probably stall this sytem) and all the slow speeds related to this and up to twice the original playback speed (one octave above). Which will be good for creative sound, as I say, hard to scale as semiquavers.Andrew
> Date: Sat, 12 Feb 2011 00:00:57 +0000
> From: morph_2016 at yahoo.co.uk
> To: pd-list at iem.at
> Subject: [PD] Pitch envelope
> 
> So...
> 
> A sample has duration (x)
> 
> A breakpoint envelope has pitch transposition from -60 to +60 semitones.
> 
> How do I work out what that would mean for the duration - i.e. how do I make it 
> so the whole pitch envelope happen within the duration of the sample?
> 
> I'm not a mathematician, and have been looking at integration, but I can't work 
> it out. Can anybody help me?
> 
> X
> Ed
> 
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