Re: Butterworth Filter

On Wed, 22 Jun 2005 15:20:18 -0700, dhruveenews@xxxxxxxxx wrote:

> Hello,
> I am working on data acquisition. I have collected some EMG data and
> now according to the research papers, the EMG data has to be filtered
> using 2nd order dual pass butterworth filter with the cut-off frequency
> of 40 Hz. What is 'dual pass'? Can anyone elaborate on it.
>
> thank you

Maybe dual pass means you have to put the data through the filter twice,
once forwards, and once backwards.

--Mac

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