Signal Toolkit - ismaxphase

Function File: L = ismaxphase (b, a)

Function File: L = ismaxphase (sos)

Function File: L = ismaxphase (…, tol)

Determine whether a digital filter is maximum phase (maximum energy-delay). The filter might be defined by the numerator coefficients, b, and the denominator coefficients, a, or, alternatively, by a matrix of second-order sections, sos. A tolerance tol might be given to define when two numbers are close enough to be considered equal.

Example:

 b = [1 2 4 4 2 1];
 zplane (b);
 ismaxphase (b)
 

Ref [1] Oppenheim, Alan, and Ronald Schafer. Discrete-Time Signal Processing. 3rd edition, Pearson, 2009.