Re: OT: Transferring vinyl to CD (again)

Eiron scribbled:

frag wrote:

Extreme case but say you had a 10KHz note with 40KHz harmonic in it,
you can hear it live, you can't record it unless you have > 40KHz
bandwidth.

You can't hear the 40KHz sine wave, but it makes the 10KHz signal
sound impure, without it it'll just sound like a 10KHz sine wave,

The digital sampling that a CD does can't take enough samples to
reproduce the mixed waveform, in fact unless it was filtered it'll
be worse than an LP because the bits of harmonic distortion it does
record will be reproduced as all sorts of random harmonic
distortion freqs.

Got any evidence to prove this?
As long as the 10 and 20kHz components are matched it should make no
difference whether the 40 or 80kHz harmonics are present, at least
for people. Maybe I'll try it on the dogs. I've got a decent sound
card and a couple of supertweeters lying around.

I recall playing around with a couple of signal generators, scope,
spectrum analysers, low pass filters, etc, back when I was working as
an ATTO for the RAF doing just this.

Just get a live instrument, say a violin, look at what it sounds like
on a spectrum analyser, then put that signal through a low pass filter
and listen to it.


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frag
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