Re: Low pass filter on a PIC

Jerry Avins <jya@[EMAIL PROTECTED]
> writes:
> [...]
> I think he said 420 Hz jitter.

Yeah. I'm not thinking too clearly on this one.

What *would* the zero-crossings of A*sin(2*pi*50*t) + B*sin(2*pi*420*t)
look like? 

How are the zero-crossings detected? Does the detection fire off an
interrupt to the PIC, in addition to stopping the counter? Wouldn't
Manfred possibly get a bunch of interrupts then (i.e., not just an
average of 50 samples / second)?
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