26 May
2013
26 May
'13
5:52 p.m.
On 05/23/2013 02:18 PM, Fons Adriaensen wrote:
On Thu, May 23, 2013 at 09:38:40AM +0200, Jörn
Nettingsmeier wrote:
yes, sorry. i misread that one - for some reason, i had a 12db/oct
filter in mind...
<snip>
moreover, i'd expect src circuits with only
-12dB at fs/s to be
unusable in practise, because the aliasing artefacts would be
obvious. it means the top octave from 10-20hkz would be polluted
with junk at -24 to -12dB,
It doesn't have to mean that. If the filter gain is -12 dB at
0.5 Fs that doesn't imply it will be -24 dB at Fs - 10 kHz. The potential intermodulation effects referred to in
the paper
by Julian Dunn are real, but not realistic. If such signals
(high energy well above 20 kHz) are present you'll have some
serious problems even in a completely analog system.
probably :)
but i found the link between passband ripple and pre-echo really
fascinating - this fact was completely new to me.
--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
Meister für Veranstaltungstechnik (Bühne/Studio)
Tonmeister VDT
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