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From: "Brill Pappin"
Subject: Re: Interesting problem to solve
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Fri, 18 Oct 2002 07:49:36 GMT
NNTP-Posting-Date: Fri, 18 Oct 2002 03:49:36 EDT
I guess that would work best with square waves... simple to implement
though... the sign waves could be converted to square waves... only I would
also have to measure the peaks to get an accurate match between the two
I could even measure very short differences between the signals by
increasing the delay by a set amount... which would be fairly easy with
square waves... but how would I delay a sign wave?
- Brill Pappin
"Don Pearce" wrote in message
> On Fri, 18 Oct 2002 07:16:27 GMT, "Brill Pappin"
> >I've got an interesting problem to solve.
> >I want to measure the time difference between the same sign wave arriving
> >two different inputs one slightly behind the other.
> >The idea being that one (variable) sign wave comes in one input, then the
> >other (same signal, just delayed for a short duration, maybe in the 10s
> >uSec) behind it, comes in the other input...
> >I'm not sure how I would do it... maybe try and measure the amplitude and
> >look for a repeating pattern.
> >Anyone have any ideas?
> >- Brill Pappin
> Use the rising edge of the first one to start a counter, and stop it
> again with the second one. Reset with a falling edge to clear the
> display.. This will give you a real-time display of the number of
> clock cycles between the two, and hence a reading of time.
> Telecommunications consultant
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