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From: Robert Baer
X-Mailer: Mozilla 4.75 [en] (Win98; U)
Subject: Re: Newbie DSP/frequency resolution question
Date: Thu, 24 Oct 2002 06:14:35 GMT
NNTP-Posting-Date: Wed, 23 Oct 2002 23:14:35 PDT
Organization: EarthLink Inc. -- http://www.EarthLink.net
Thomas Magma wrote:
> I'm having a hard time finding the answer to this one on the internet. I
> have a bad text book that tells me that frequency resolution is "one over
> the sample period". Is this right? So if you sample a 1MHz signal for 100ms
> the best you can resolve the absolute frequency is to with in +/-10Hz? Surly
> this can be correct... how could they ever rate a oscillator for short term
> stability if this was correct? And what about sample rate and bit resolution
> how does that fit in?
If one samples a signal every 100mSec (ie: 10 samples per second) then
the highest (non-aliased) signal that can be determined is 5Hz.
Obviously the sample rate is already stated in the previous sentence.
Check out the Nyquist criteria.
Bit resolution has nothing to do with this.
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