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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: RE: One Comment, Two Questions posted by John Swenson on February 9, 2009 at 15:16:50:
The problem with FPGAs is one would need training in how to program and implement the things..... I personally have never had experience with them......
"Then there is the issue of do you use the same filter for all sample rates?"
The filter is only needed for lower sampling rates..... If it's over 60 kHz, I think an analog RC filter is sufficient. The problem is below that rate, there are modulation and ringing issues in regard to the uppermost part of the 20Hz-20kHz audio band...... I don't think 96 kHz playback needs digital filtering. Just use an RC network that allows full amplitude at and below 20 kHz and full attenuation at and above 48 kHz.....
"The big tradeoffs are for 44.1 since it is so close to the audio band."
That's the sole reason why digital filtering is utilized for 44.1 kHz playback.....
"Does it make sense to use the same filter at 96 or 192? maybe not. I don't think there has been a lot of exploration of this aspect."
I don't think 96 and 192 capable DACs apply filtering for settings above 48 kHz. (88.2 kHz, 96 kHz, 176.4 kHz, and 192 kHz.)
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Follow Ups
- FPGA FIR Filters..... - Todd Krieger 16:52:59 02/09/09 (0)
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