[Mogens V.]

wrote:
On Oct 30, 12:53 pm, Mark wrote:

What it buys you is that you no longer need a brick wall filter at 20 KHz...
you can instead have a very relaxed filter at a few hundred KHz if not
a couple MHz, and do most of the anti-aliasing filtration in the digital
domain when you decimate down from the high rate data down to 44.1.

A brick wall filter in the digital domain is just as bad as a brick
wall filter in the digital domain. Even an FIR brick wall filter will
ring... Gibbs phenomenon.

But all this ringing is up around 20 kHz and only happens when the
rest of the system is flat, so in practice sampling at 44.1kHz is just
fine.

Mark


and it is this artifact of filter ring (processing algorithm?) that
colors the digital sound,
thus, to avoid coloring sound with digital artifacts who's creation is
inherent in digital processing,

This thread doesn't evidence digital artefacts as inherent..

working at higher sample rates removes the artifacts from our audible
range.
leaving the air surrounding the note intact.

Provided your chosen converter happens to work better at such higher
sample rates..


Following the filter discussions.. are filters generally designed with
a fixed cutoff, or do they move up with (user selectable) sample rates?
If fixed, I may see a point in using higher sample rates - on an ill
designed converter, that is..

--
Kind regards,
Mogens V.