Subject: Re: Interesting problem to solve
Date: Fri, 18 Oct 2002 04:48:40 -0700
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I'm gonna go out on a limb here and state that if the signals are sinusoidal
and continuous, you have no way to determine whether they are delayed
or out of phase by more than one cycle...unless you have additional unstated
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Brill Pappin wrote:
> Yes, that would work well for a single period, but if the signals are more
> than that apart, I wouldn't be able to tell that I had to skip one.
> What I really want to measure is the vector of the difference between the
> two signals. but if I've got an amplitude of say 2uS, and I delay the signal
> by 6uS, I would get a value of 2uS if measuring the 0 crossings (I'm
> assuming I'm getting more than a single period).
> - Brill Pappin
> "Paul Burke" wrote in message
> > Brill Pappin wrote:
> > >
> > > I've got an interesting problem to solve.
> > >
> > > I want to measure the time difference between the same sign wave
> arriving at
> > > two different inputs one slightly behind the other.
> > >
> > Since the two sinewaves are variable in amplitude, you need to measure
> > between the zero crossings. Use comparators to square up the sinewaves,
> > then start your counter on the first rising edge detected. Stop the
> > counter when both inputs are high.
> > Paul Burke