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In Reply to: Comparison: Take 5; SACD to 24 bit remaster posted by Duilawyer on December 28, 2003 at 13:46:20:
the sampling frequency in the recording relates to how faithfully one can reproduce a given signal freq. and also affects post processing artifacts of filters...the ear/brain sampling frequency has to be > 10 kHz if we can hear up to about 20 kHz as such...the neurons probably dont fire all at the same time and those that dont are probably integrated to give some bulk signal (and consider pathlength differences in brain signals) , which are likely to constitute one element of our limitations to hear certain things (phase diff, time dependent level diff, time alignment, etc.)I think theres a good analogy with the eye, where we "sample" at around 30 Hz or more...yet a blinking light flashing a higher rates, while appearing not to flash (or a fast rotor would appear to rotate at a slower freq.), but still can induce some fatigue (i.e, the eye sees it, but we dont process it as discrete events)...the limitations is in the interpretation..think also of the frequency spectra of visible light ...waaay beyond 30Hz yet we can see/know different colors...
So the bottom line is we probably respond to > 20kHz signal, but dont know it to be the case as a conscious respons...
IMWO, SACD produces, amongst other things, high freq. "random" noise that can be subjectively appreciated and unconsciously registered...in line with what dither has been doing to "smooth" out digital recordings on CD before but for a narrower window.
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Follow Ups
- separate issues? - NonA 12/29/0309:10:14 12/29/03 (0)
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