Reconstruction filter design criteria. - diyAudio
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Old 17th April 2009, 10:44 AM   #1
Aiace is offline Aiace  Italy
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Join Date: Feb 2003
Location: Florence
Default Reconstruction filter design criteria.

I'm looking for the criteria to design a good reconstruction filter, but i don't find too much till now. So

1) is it better to make it passive or active ?
2) Can I use inductors to do it or is better to avoid them because the filter could ring?
3) What about phase? I haven't find anybody tha speek about the phase linearity, but my personal opinion is that the phase is important too.
4) where shoud the filter begins to operate ? from 20 Khz or from an higher frequence?
5) Any suggest or scheme?

Thank you Aiace
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Old 17th April 2009, 03:22 PM   #2
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Join Date: Jun 2007
You need to let us know a bit more about the application.

1. Is the DAC using sigma delta or PCM modulation?
2. Is the DAC doing any over-sampling?
3. Does the DAC provide any limited on-board anti-aliasing already?
4. Is the DAC feeding a transformer coupled output?

Good Luck
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Old 18th April 2009, 09:06 AM   #3
Aiace is offline Aiace  Italy
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Join Date: Feb 2003
Location: Florence
I'm using the PCM1794 feeded by an ASRC. I want to experiment sevrale situations from high upsample to bypassing the ASRC. So I think i should better to begin to filters since 20kHz.
The board does not have any anti-aliasing.
No, I'm not using any transformer for now: I 've designed a discrete IV converter that I want to listen at.


Aiace
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