Re: Searching for Notch Filter

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#819

From: George J. Woyansky
Date: Wed, 16 Dec 1992 00:43

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In article <1992Dec15.181336.3424@iplmail.orl.mmc.com> natd@iplmail.orl.mmc.com (Natalie Day) writes:
>Hi,
>  I am having problems with the following and would like to know if there is a 
>good cookbook approach to the following:
>
>  Problem:  I am receiving EKG (electrocardiagram) signals as an input to 
>            a system.  The problem is that there is a 60Hz noise riding the
>            signal and I would like to get rid of it.  
>            I am looking for a good 60 Hz notch filter, (digital software 
>            filter).  I have tried a 6 pole IIR filter but I get a lot of
>            ringing.  Does anyone have any suggestions/solutions to my problem?
>
>   Thanks for you responses!
>
>
>                              Nat

I suggest you look in the paper 'Adaptive Noise Cancelling: Principles
and Applications' by Widrow, Glover, et. al., Proc. IEEE, Vol. 63, No. 12,
pp. 1692-1716, December 1975.

In this paper, they use adaptive filter techniques to achieve exceptionally
sharp notch-filters for use in a variety of applications.  One of the sections
is entitled 'Cancelling 60Hz Interference in Electrocardiography'.  Sounds
like this might be right up your alley.

-George Woyansky
 ECE Dept., Carnegie Mellon University
 Pittsburgh, PA  15213

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From: woyansky@flamingo.ece.cmu.edu (George J. Woyansky)
Subject: Re: Searching for Notch Filter
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Organization: Electrical and Computer Engineering, Carnegie Mellon
References: <1992Dec15.181336.3424@iplmail.orl.mmc.com>
Date: Wed, 16 Dec 1992 00:43:16 GMT
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