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In Reply to: RE: LOTS of new MQA on Tidal posted by Dave_K on September 5, 2017 at 11:32:29:
> > Since we're dealing with high sample rate PCM, I would argue there is no good reason to use a brick wall filter anyway. We don't need the pass band response to be ruler flat all the way up to 44 KHz or so. I understand why brick wall filters were developed for CD playback, but don't understand why they are being utilized at high sample rates unless it's a matter of implementation convenience. < <
No, it's just a matter of people following the "rules" they were taught in school.
> > On the other hand, a brick wall filter with a cut off at 44 KHz is far enough away from our normal hearing range that it ought to be innocuous compared to a brick wall filter for CD playback. In your experiments, what have you noticed regarding the audibility of different filter types/slopes at double or quad sample rates? < <
One would *think* that ringing at 22kHz would be "innocuous". But go listen to a poorly executed metal dome tweeter and you will hear things that "science" tells us are inaudible. I have found the same to be true of brickwall filters. While a 96kHz brickwall filter is less offensive than a 22kHz brickwall filter, it most definitely can be heard.
It is clear to me that our current understanding of the ear/brain mechanism is woefully deficient. See link below:
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Follow Ups
- RE: LOTS of new MQA on Tidal - Charles Hansen 09/5/1717:27:00 09/5/17 (0)
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