Hi Chris,
*Very* long time no see - back in the UK some 20-odd years ago!
Not sure about the M-Audio, but it was very common in the early days of 96kHz
(and still today with some boxes/processors/consoles) for the i/o to be clocked
for 96kHz, but the internal processing still to be done at 48kHz so as to avoid
doubling the amount of DSP required! Obviously there would have to be a
20kHz low-pass filter (often fairly sloppy) in there. For 99.9% of users,
no-one
notices the scam, uh, sorry, 'engineering rationalisation'. . .
Recently also there has been a settlement of a class-action lawsuit against
'Creative' for an if not identical, similar "it says it does 96 but it doesn't"
kind of
issue with their MP3 USB box and another (?) of the same vintage.
Caveat emptor, and buy new generation stuff that doesn't just say "96kHz!" but
actually specifies audio bandwidth, too.
Cheers,
Steve W3EEE, G3YDV
06/05/05 23:10:52, "bartram_chris" <[EMAIL PROTECTED]> wrote:
>I've used my M-Audio Transit USB box at 96kHz sampling rate with v0.95
>and my 1.4GHz Dell laptop. It works without any apparent problem. But,
>there is an issue with this unit as there is an internal 20kHz-ish
>anti-aliasing filter implemented somewhere, and so, if we believe
>Nyquist, it's not exactly productive to sample more rapidly...
>
>Does anyone have any circuit information about the Transit USB box? If
>the anti-aliasing filter is done in hardware, that wouldn't be
>difficult to change, but if it's a software filter, that might be more
>difficult to tweak for this dinosaur.
>
>73
>
>Chris
>GW4DGU
>
>
>
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