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Maximally flat low-pass filters with steeper slopes at cutoff

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2 Author(s)
Budak, Aram ; Colorado State University Fort Collins, Colorado ; Aronhime, Peter

Maximally flat rational functions with one pair of imaginary axis zeros are compared with the all pole Butterworth function for low-pass filter applications. It is shown that by using the location of the zeros as a parameter an advantageous trade between attenuation in the stopband and sharpness of the cutoff characteristic can be made. Graphs which serve as guides in the placement of these zeros and a practical design example are included.

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Audio and Electroacoustics, IEEE Transactions on  (Volume:18 ,  Issue: 1 )