27 Jun
2005
27 Jun
'05
12:04 p.m.
On Mon, Jun 27, 2005 at 01:57:34PM +0200, Florian Schmidt wrote:
Assume a samplerate of 96khz, then there's quite a
bit of signal which
doesn't need to be processed since it's far out of the range of human
perception.
This seems like a sensible idea, but one could wonder why in that case
the sample frequency needs to be 96 kHz (*).
It's probably possible to minimize the artefacts by using a gentle
cutoff, e.g. a raised cosine from bin k1 to k2, k1 < k2.
(*) Recent experiments by prof. Angelo Farina (Univ. of Parma, Italy)
suggest strongly that when the DA conversion is done properly, there is
no audible difference between a sample rate of 48 kHz and any higher value.
OTOH, he only found one type of DAC that was good enough in order to be
completely free of audible artefacts at 48 kHz (by Apogee, and they are
quite expensive).
--
FA