Reconstruction filter design criteria.

Aiace · 17th April 2009, 11:44 AM

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

WithTarragon · 17th April 2009, 04:22 PM

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

Aiace · 18th April 2009, 10:06 AM

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

17th April 2009, 11:44 AM	#1
Aiace diyAudio Member Join Date: Feb 2003 Location: Florence	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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17th April 2009, 04:22 PM	#2
WithTarragon diyAudio Member 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

18th April 2009, 10:06 AM	#3
Aiace diyAudio Member 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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