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tbm  
#1 Posted : Thursday, September 2, 2010 11:33:07 AM(UTC)
tbm

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Hi

Does Buffalo II (ie. ESS chip ES9018) contain out of band noise that must be filtered in I/V stage(IVY III) to avoid artifacts?
If so, at what frequency? Different for different sample frequencies? 44.1, 96, 192...

Thanks,
Tom


Edited by user Thursday, September 2, 2010 12:21:40 PM(UTC)  | Reason: Not specified
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Russ White  
#2 Posted : Thursday, September 2, 2010 4:21:54 PM(UTC)
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All DACs really need filtering to some degree. Because of the extremely high frequency of the asynchronous re-sampling and the dual digital filters in the ESS chip (IIR and FIR) the filter frequency can be much higher than other DACs. I usually aim for between 60khz and 100khz corner low pass. And the filter does not need to be very steep. 1st order is ok at 60-80 khz.

We do this filtering on our I/V stages. IVY-III and Legato.

Edited by user Thursday, September 2, 2010 4:24:34 PM(UTC)  | Reason: Not specified
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tbm  
#3 Posted : Thursday, September 2, 2010 9:46:44 PM(UTC)
tbm

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Hmmm, 192kHz sampling material that does have freq components up to 96kHz.
(The ES9018 can do higher than that)
In IVY III you filter with 1st order -3dB (50% down) at 54kHz, thus damping valid music signal.
I can't hear that high of course, but it seems like a bit low -3dB freq for LP filter, or?
What is your experience here?

Edited by user Thursday, September 2, 2010 10:23:36 PM(UTC)  | Reason: Not specified
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