On 04/21/2012 08:12 PM, William Pretty Security wrote:
Thanks to All of you for the help J
Now I am into the cosmetic stuff (= just about done) ...
With a sample rate of ~90KHz the FFT frequency axis starts at 0 and
goes to ~45KHz.
I have a band pass filter from 35KHz to 55KHz.
Does anyone know how to make the frequency axis start at say 25KHz to
60KHz ?
Still a 45KHz spread, just off set by 25KHz so that 40KHz is roughly
centered ...
It doesn't REALLY matter, it just look better J
Thanks
Well, if you're real-mode sampling, the highest frequency you can deal
with is 45KHz. Nyquist, not just a good idea, it's a theorem :-)
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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