I'd download one of the many excellent filter design applets and play with the window selection buttons.

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Posted on 2004-11-24

I want to design using the windowed fourier series approach a linear phase FIR lowpass filter of lowest order with the following specifications: passband edge at 0.3pi, stopband edge at 0.5pi, and minumum stopband attenuation of 40dB. Which window function is the best appropriate for this design and why?? (examples: hamming, hanning, blackman....etc)

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I'd download one of the many excellent filter design applets and play with the window selection buttons.

I'm an engineering student and i've just studied this functions last semester. Well, after reading your specification, you shall use Hanning Window, Hamming and BlackMan windows functions but Hanning is prefered. This is because with hanning, the Stop Band Attenuation that can be achieve is 44dB ( according to my lecture notes and it's standard). Below is the StopBand Attenuation that can be achieve using the three window functions mentioned:

Hanning 44dB

Hamming 55dB

BlackMan 75dB.

We should take the smaller value of SBA because it's more than sufficient according to your specification.

Cheers :)

SokhodoM

Yes, you are correct and thanks for the explanation....

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