Sorry, the only solutions I've ever known is to antialias the signal
sources by low-pass filtering them before they reach a sampling rate
where they could alias, or by using band-limited signal sources in some
way or another. Once the aliased frequencies are in, it's pretty near
impossible to get them out.
Best!
D.
On 4/12/10 11:10 PM, [email protected] wrote:
dear derek, dear list
is there any possiblity to make an antialaising for the dac output of a
mixed signal?
thanks in advance
der.brandt
Zitat von "Derek Holzer" <[email protected]>:
The frequency components introduced by aliasing cannot be removed (at
least not by low-pass filtering) once introduced, and this happens at
the level of signal generation, not at the interface to the dac. Since
it is the phasor which is actually aliasing, it needs to be
antialiased with a low pass filter before it continues on the a lower
sampling rate. So the signal source and the filter need to be in the
same upsampled subpatch.
Best!
D.
On 4/12/10 5:49 PM, Pierre Massat wrote:
Hi all,
recently there was a discussion about the different ways of avoiding
aliasing. One of these is oversampling, but as far as i know there is
only one example of it in Pd help patches, and it has a phasor in the
subpatch. I m assuming that i could use the Butterworth filter in the
subpatch without the phasor, am i right? In this case would it make
sense to use it everytime i need i low-pass filter?
This is probably a very silly question...
=
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::: derek holzer ::: http://macumbista.net :::
---Oblique Strategy # 45:
"Disciplined self-indulgence"
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