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In Reply to: RE: No Anti-Aliasing Filter posted by Doug Schneider on August 18, 2018 at 11:11:24:
> I believe he said multiple time that it had no filter...I think you misunderstood what Charley was saying, Doug. You must have
a filter of some kind with a sigma-delta DAC chip to turn the bitstream into
linear PCM. Charley's genius was to realize that he could use a time-
domain-perfect filter (the QA-9's Listen filter) because the possibility of
aliased energy leaking into the audioband was small. By contrast, the
QA-9's Measure filter is a conventional minimum-phase antialiasing filter.
Again, all of this is examined in my writings for Stereophile.> And he put that in one of the threads where you'd discussed having your
> files MQA'd that were processed through his A-to-D. His point was they
> couldn't apply any correction because there was no filter to correct...The files that I had encoded with MQA for my listening tests were made with
dCS and Metric Halo ADCs as well as the Ayre QA-9, the latter sometimes
in Measure mode, sometimes in Listen mode.
John Atkinson
Technical Editor, Stereophile
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Follow Ups
- RE: No Anti-Aliasing Filter - John Atkinson 08/18/1812:04:09 08/18/18 (1)
- RE: No Anti-Aliasing Filter - Doug Schneider 14:49:10 08/18/18 (0)
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