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From: John Seney
Subject: Re: Newbie DSP/frequency resolution question
User-Agent: MT-NewsWatcher/3.0 (PPC)
NNTP-Posting-Date: Wed, 23 Oct 2002 08:17:23 GMT
Organization: AT&T Broadband
Date: Wed, 23 Oct 2002 08:17:23 GMT
In article , "Thomas
> 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
> the best you can resolve the absolute frequency is to with in +/-10Hz?
> this can be correct... how could they ever rate a oscillator for short
> stability if this was correct? And what about sample rate and bit
> how does that fit in?
Free book on DSP
In 100 ms, only 1 full cycle of 10 Hz occurs.
Oscillator (clock) stability can be measured looking at time
intervals between edges and using statistics. It will usually
either take a long time to capture the low frequency effects
or deep memory to capture it "single shot".
Scope FAQ at http://www.qsl.net/wd1v
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