Hi Claude,

On 21/03/15 12:00, pd-list-request@lists.iem.at wrote:

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Hi Claude,

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On 20/03/15 18:24,pd-list-request@lists.iem.at wrote:

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you can hear aliasing quite easily - you turn up the pitch dial on your oscillator and hear some other frequencies sweep downwards (and out of tune)

Could you explain this better? If I create a glissando effect using [line~] and [osc~], I don't hear any of the aliasing you mention, only the expected result of a pitch going up. In which situations would these aliasing effects appear?

you don't hear it with a single sine osc~ until very high frequencies (half the sample rate at best) as it doesn't have many partials

the higher frequency partials in the table in the attached patch fold over even when the oscillator fundamental is fairly low

But then you are talking about aliasing due to the Nyquist–Shannon sampling theorem, right? I thought the aliasing was due to the presence of [line~] and the glissando, not simply because of the sampling theorem (the glissando simply helps to make the effect obvious, but a single oscillator with high enough frequency would produce the frequency folding, am I right?). in that case, I do understand what you mean.

Thanks and take care, Gilberto