Hi,

In message , Jim H
writes
In article ,
Clive Backham wrote:
What's left for debate is whether the sampling frequency used for CD
is already at or beyond the limits of human hearing

It is - when digital was in its infancy I and many of my colleagues
had an
opportunity to play with different sampling rates on a wide variety of
material. And the point where any difference is detectable is below that
of CD - *that's* why it was chosen - although the exact rate was down to
TV video parameters so video recorders could be used.


Is it possible that, back then, the DACs were only effective up to a
certain rate, at a lower rate than for the ear? If, say the DACS showed
no improvement in sound past 44kHz, your experiment would always show
cd to bo optimal. Just a thought.

I don't think that DAC speed would have been a problem, even in the
early days of digital. Even in the early to mid 80's there were video
DACs that could run in the tens of megahertz range, though they were
admittedly only 8 bit units, rather than 16 bit.

--
Regards,
Glenn Booth