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how to design an sinc(x).^3 compensated IIR filter in matlab

Started by subrahmanya ks May 6, 2005
Hi,

how to design an sinc(x.^3 compensated IIR lowpass filter in matlab?.
filter specification are allowed passband ripple = 0.1dB
sampling frequeny = 200kHz
cutoff frequency = 15e3;
stopband level = -120dB.