Re: filtering question

Hi all, i have a question on filtering here.apparently my filter plot
shows
it can get rid of frequency up to 0.017.

it still shows components between 0 to 60Hz. Why is this so??

Hi,

Maybe you should not look at it with two different frequency scales.
Your plot of the filter characteristic is on a normalized frequency
scale.
So if you plot both with normalized frequency
scale, you will see that it works as expected.

gr.
Anton





oh gosh, now i tried to run my filter again and it is not zero at 0.017
anymore. Does the filter differ in every run? I tried putting Ws=0.019 and
Wp=0.0225, to achieve my objective of having zero component at 0.017 but
the lower cutoff does not change at all! It remains below 0.017. Did i do
something wrong?

Moreover,i have tried to plot them on the same scale but there is still
some coponent at 0. Why cant i get rid of them?

Thanks for your help.

.

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