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#X text 40 75 The all-pass filter has a phase response that depends on its coefficient \, and a flat frequency response. The coefficient (p) gives the location of the pole. There is a zero at 1/p \, unless p=0. If p=0 the filter is effectively a one-sample delay. Negative values of p are allowed (as long as p is between -1 and 1)., f 48;
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