[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

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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