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Thread Subject:
zero pole method - iir filter

Subject: zero pole method - iir filter

From: PinkLab

Date: 27 Apr, 2010 18:23:07

Message: 1 of 2

can anyone help me on how to design a bandpass iir filter with zero pole method? i have nyquist frequency = 800 Hz ; pass band = 300 Hz ; central frequency = 100 Hz

Subject: zero pole method - iir filter

From: Wayne King

Date: 27 Apr, 2010 19:20:05

Message: 2 of 2

"PinkLab " <pinklab@pinklab.com> wrote in message <hr7a2b$frn$1@fred.mathworks.com>...
> can anyone help me on how to design a bandpass iir filter with zero pole method? i have nyquist frequency = 800 Hz ; pass band = 300 Hz ; central frequency = 100 Hz

Hi, I think Rune tried to help you earlier. Isn't this the same post? When you say you have a passband of 300 Hz, I'm assuming that you mean it's 300 Hz wide centered on 100 Hz? That's a little confusing since that would put you at DC on the low end, in which case you would just be trying to design a lowpass filter. Maybe you mean that you want to pass everything below 300 Hz? In any event, I think you have to be more specific in your filter design. See the help for

fdesign.lowpass
and
fdesign.bandpass

you can design an IIR filter depending on how you specify the filter. An IIR filter will have zeros and poles, in other words, it will have a rational transfer function.

Wayne

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