Signal Toolkit - isminphase

Function File: L = isminphase (b, a)

Function File: L = isminphase (sos)

Function File: L = isminphase (…, tol)

Determine whether a digital filter is minimum phase. 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 toleranve tol might be given to define when two numbers are close enough to be considered equal.

Example:

 a = [1 0.5]; b = [3 1];
 isminphase (b, a)
 

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