How can I eliminate a ringing noise from a 60 Hz analog notch filter?

Using 60Hz analog notch filter may cause some ringing noise for the signal of cutoff frequency edges. Do you have a method excluding such a ringing noise? I guess that a deconvolution method will be helpful for the problem but I cannot apply that properly.

ELCA,
A different approach is to average in the time domain.
I suggest a method called 'boxcar' used in physics labs sometimes.
Slice your time between two triggers in let's say twelve equal time slots and do a lowpass (f0) on
each slot.
The result is a stepwise approximation of your curve. In the frequency domain this is about the same
as a bandpass at the cardiay frequency with the bandwith f0
60 Hz signal is problem only if your rats heart beats inside this bandpass. But when it is at 60 Hz
you might have lots of difficulties anyhoe ;-)
Urs
ELCA schrieb:
> Ron,
>
> My signals are the cardiac beatings of a rat through a 60 Hz analog
> notch filter. For averaging, I obtained several dozens of epochs with
> a fixed trigger
positon.
> I tried averaging the epochs in the frequency domain(FFT and averaging
> only for the amplitude) and took the inverse FFT of the averaged
> signal. However, the result was not satisfactory. It gave me a more
> noisy shape and still 60 Hz ringing. If you have some comment about
> that, please let me note that.
>
> ELCA

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