At 10:56 15/08/2003 +1000, you wrote:
>There must be something in this compression argument, especially for the
>sorts of sounds that Rich Peet describes as "fast attack sounds". For the
>first time I have noticed a difference, not between MD and DAT, but simply
>between the 48 kHz recording rate of my Sony Pro DAT and the 44.1 kHz
>CD-compatible rate that my computer uses.
>
>My DAT records at 48 kHz so I need to convert this to 44.1 kHz in order to
>process the sounds on my computer. To do the conversion I simply feed the
>sounds from the DAT to my iMac via analogue inputs, where the sound is
>automatically taken up by the computer at 44.1 kHz. Up till now I've not
>noticed any difference in sound quality between sounds heard directly from
>the DAT compared to the same sound once it has been fed into in the
>computer.
>
>But there is a particular species of frog here in Australia, the Striped
>Marsh Frog (Limnodynastes peronii) that gives a loud 'tok' call, a bit lik=
e
>the sound of a tennis ball being hit. I have a nice stereo recording of
>these frogs, tok-ing away happily, and it sounds great on the DAT, each to=
k
>has a beginning a middle and an end, even if such a short note. But when
>reduced to 44.1, the call is less pleasing and rather sharper, and better
>listened to at a lower volume. There isn't a lot of difference, but you c=
an
>hear it.
>
>I thought it worthwhile to report on this perceived effect. Perhaps the
>Striped Marsh Frog would make a good 'test subject' for further compressio=
n
>tests!
>
>Vicki Powys
>Australia
This problem was discussed in many musician forums and depends mainly of
the architecture of the sound card, specially the base frequency used
internally
by the audio chipset (44.1 kHz or 48 kHz).
Some of the new sound cards with 96kh/24bits possibilities use 48 kHz as th=
e
base frequency (audigy II ex for example). Many (non professional) musician=
s
\complain about this due to the digital conversion 44.1 kHz -> 48 kHz ->
44.1kHz
operated by the chipset on the digital inputs. If you use a DAT at 48 kHz, =
no
modification seems to be done on the signal.
The reciprocity should be true with 48 kHz digital sources and common sound
cards working at 44.1 kHz.
D. Filippi
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