18 Jan
2005
18 Jan
'05
12:31 p.m.
Interesting. So that one is responding past 20 kHz? What program are
you using? You can't just connect the output back to the input and do
the test that way? Should then test at a low sampling rate like 11025
Hz, and see if it aliases.
Interesting.
I did two measurements @96000, first with a tone sweep, and then with
white noise. The results were:
Tone sweep:
www.geminiflux.com/Stuff/snapshot1.png
White noise:
www.geminiflux.com/Stuff/snapshot2.png
The card being use was Echo Mona Laptop, the microphone a Shure Beta58
(which might account for the weird behaviour), and the speakers were
Mackie HR824.
I'll give it a try next week with a better microphone.
Cheers,
Andres
Jon B wrote:
>I realized why they do this. With variable sampling frequencies,
>44.1, 48, 96, you would need different filters to get the best out of
>each one. So they just do 20 once and throw away the extra bandwidth.
> So does that mean they will alias at sampling rates like 11025? This
>could be tested, too.
