Re: How to filter out a nearby frequency

alan wrote:

Thanks for the replies. I should have mentioned that Sensor B measures
signals at all kinds of frequencies, and that there only exists noise at
3-4 Hz and 0.5 Hz, of which Sensor A reads the 3-4Hz noise correctly and
0.5Hz noise incorrectly. Sensor B is used in a feedback loop, so I
can't go around changing it's output signal otherwise.

Define 'all kinds of frequencies'. What is the passband of the signals
of interest?

Are sensor A and B identical (including their inputs)? Why do you say
'Sensor A reads .... incorrectly'?

If he two sensors aren't producing the same output at the frequency you
want to cancel, you are going to have to characterize this difference in
order to use the one signal to cancel the other one out.

I would also prefer to keep the solution analog and simple, i.e.
something I could do in a day and without buying other digital stuff.
Thanks for the ideas for digital solutions, though. I'll have to look
at them some time in the future.

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