On Wed, 25 Jul 2001, Edson Brusque wrote:

>
>     I mean, if the wave is very clean, like a pure sinusoidal, I could try
> to sample it between two zero-crossings and I will have a very precise
> value. But what about if it does have some loud harmonics? For example, if
> it's a sine with 100Hz plus a sine with 187Hz, both mixed and with the same
> intensity, the zero-crossings will be all over the place so I can't sample
> between two zero-crossing because the values will be meaningless.
>
  If you know the frequency range of your signals then a second order
Chebishev filter may help you to split your signal in two clean signals.
If your signals have very close frequency than maybe a notch filter will
help you more. I'm curious too if this problem could be done just in
software and how ?
Vasile

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