I realize that I should have written "however higher playback
frequencies of the arrays will still alias"--meaning that if any of the
partials went above Nyquist, you'd still have aliasing. Sorry for the
confusion.
D.
On 3/28/10 4:03 PM, Roman Haefeli wrote:
On Sun, 2010-03-28 at 15:37 +0200, Matteo Sisti Sette wrote:
Roman Haefeli escribió:
On Sun, 2010-03-28 at 14:14 +0200, Derek Holzer wrote:
Generate bandlimited waveforms. Works for lower frequencies, however
higher frequencies will still alias...
Why is that? I thought, when just playing so many partials of the
waveform, so that all of them fit in below the nyquist frequency, there
won't be any aliasing? Is that wrong?
I don't think it's wrong. Obviously, if you generate only ONE table
(with sinesum for example) with all the partials necessary for using it
at low frequency, and then use it at higher frequencies, it will alias.
But if you use different tables for different frequencies, always
summing only the sines that are below the nyquist frequency, there can't
be any aliasing.
Thanks for clarification, Matteo and Derek. This is actually what I
initially thought as well, but the sentence 'however higher frequencies
will still alias' sounded to me, as if more measures would be necessary
in order to get completely rid of aliasing, which would have been unkown
to me.
Roman
--
::: derek holzer ::: http://macumbista.net :::
---Oblique Strategy # 154:
"The most easily forgotten thing is the most important"
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