Re: Aliasing and qtscope

From: Bernd Porr <BerndPorr_at_f2s.com> · Date: Mon, 16 Oct 2006 23:57:32 +0100

Hi!

qtscope plots simply the data which is coming in. So it doesn't do any 
antialiasing (low pass filtering). You should do antialiasing on the 
analogue side to satisfy the Nyquist criterion.

/Bernd

Ignacio Lorenzo Subirá Otal wrote:
> Hi all!,
> 
> I'm using qtscope to acquire from a usb dux fast card connected through 
> a High pass filter to the mains network.
> 
> After acquiring data, I'm processing it with Scilab and obtaining the 
> fft. What I now wonder is, do I have aliasing in that fft?. I mean my 
> filter is high pass and I don't know if the qtscope performs any kind of 
> anti aliasing system or if I can perform it in any way wich is not via 
> hardware.
> 
> Does anyone know?, thanks for your time,
> 
> Ignacio Lorenzo Subirá Otal
> st11617_at_salle.url.edu
> 
> 
> 
> 
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