Creates an allpass filter from Ref: Oppenheim and Schafer, Discrete-Time Signal Processing.This function creates a filter with a magnitude response of unity and n number of pole/zero complex-conjugate pairs spaced evenly starting at Fst and ending at Fed. The order of the allpass filter is 2n. The coefficients of the filter, b and a, are passed as output arguments. ALLPASS can run without the output arguments. This will display the Pole-Zero plot and the frequencyresponse of the filter.




File list:
allpass.m