From: user5857@newsgrouper.org.invalid
George Neuner posted:
> On Mon, 8 Sep 2025 10:59:50 +0200, David Brown
> wrote:
>
> >... For people who say they can distinguish CD audio from
> >AAC or other high bps compressed audio, and other "golden ears"
> >distinctions, it's a different matter - in double-blind tests, most fail
> >badly. There are a great many factors involved in high-quality audio
> >reproduction - the basic sample rate is only one of them.
>
> That's true, but the basic sample rate does make a significant
> difference. I don't know if it is true, but I have read that to
> /accurately/ reproduce a given note requires 10 to 11 harmonics: the
> primary note, 7 higher, and 2 to 3 lower.
>
> This means most notes will include sounds that are outside the range
> of (normal) human hearing, but you can still /feel/ these sounds [even
> the high ones] and miss them when they are absent.
Or when the reproduction of the harmonics is out-of-phase wrt the
harmonics of any live version of the same note.
> C8 (high C) on the piano is ~4186 Hz. Assuming the need for the 7th
> higher harmonic - 29302 Hz - Nyquist would demand a minimum sampling
> rate of 58604/s to accurately reproduce C8.
While I can guarantee that I could not hear a 24 KHz pure sine wave tone;
I can guarantee that I can hear a phase shift of the 24 KHz harmonic of
the non-sinusoidal musical note at 6 KHz.
> In practice, unless you like orchestral, or certain folk or country,
> you are not likely to hear much difference between a CD and a decent
> quality compressed version of it. But the CD itself is not a faithful
> reproduction of the live performance.
>
> And, of course, if you like orchestral you are more likely to be
> listening to vinyl rather than CD. 8-)
--- SoupGate-Win32 v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
|
