--- In [email protected], "Luca" <[EMAIL PROTECTED]> wrote:
>
> 1) Is really usefull to have 96KHz sampling rate when the actual
> frequency reponse of most cards are 20-20Khz? I mean with 96Khz
> sampling rate we would expect 48Khz audio bandwith but, as the card
> are for audio purpouse, they are limited to 22Khz.
Hello Luca,
that is really a good question, but luckily it seems that, at least
with good cards, that is a false problem. See below.
> 2) Are there 96khz cards (or 192khz) with the full frequency
> response to Fs/2? Just in that case it would double the SDR
> frequency windows.
I have recently tested in Wuerzburg the EMU-1616M external audio
adapter, which can sample up to 192 kHz, and its frequency response
(when looked at with Winrad) was flat from -85 to +85 kHz, for a total
of more than 170 kHz of useable bandwidth for an SDR. Also my Delta
44, when set for 96 kHz sampling, is flat from -45 to +45 kHz. I have
reports (not tested personally) that the M-Audio Audiophile 192, that
can sample up to 192 kHz, also is "well behaved" in the sense that its
anti-aliasing filters are correctly set depending on the sampling
frequency.
So the answer is : buy a good card, possibly one that has been already
tested by somebody else, and you won't go wrong !
73 Alberto I2PHD
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