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I'm sampling two signals with fundamental frequency of 50 Hz. I want to sample them at the same instant, but there's a delay between the first and the second conversion. I don't keep the previous values of the signals in an array, at most I can store 10/20 samples.

I want to correct this delay. I thought of a FIR fractional delay, but i'm not sure is the right way to do it.

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    $\begingroup$ Do you know what the delay is, or do you you need to figure out what the delay is from the 10/20 samples? $\endgroup$
    – Jim Clay
    Commented Apr 13, 2014 at 8:26
  • $\begingroup$ I know the delay and it's always the same. $\endgroup$
    – photonic.bean
    Commented Apr 13, 2014 at 18:05
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    $\begingroup$ Then yes, a FIR fractional delay filter would be very appropriate. $\endgroup$
    – Jim Clay
    Commented Apr 13, 2014 at 21:26

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Assuming you are sampling above the Nyquist rate, then an interpolation kernel or equivalent fractional FIR filter on one or both channels (both to match up any non-zero processing delays) might be an appropriate solution.

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