[PD] Filters...
brandt at subnet.at
brandt at subnet.at
Mon Apr 12 23:10:33 CEST 2010
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" <derek at umatic.nl>:
> 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...
> =
>
> --
> ::: derek holzer ::: http://macumbista.net :::
> ---Oblique Strategy # 45:
> "Disciplined self-indulgence"
>
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