Filter Design Toolbox

ismaxphase

Test quantized filters to see whether they are maximum phase filters

Syntax

• flag = ismaxphase(hq)
  flag = ismaxphase(hq,k)
  

Description

flag = ismaxphase(hq) determines whether filter hq is maximum phase, returning 1 if true and 0 if false.

flag = ismaxphase(hq,k) determines if the kth-section of filter hq is a maximum phase section and returns 1 if true and 0 if false.

The determination is based on the reference coefficients. A filter is maximum phase when the zeros of its transfer function are on or outside the unit circle, or when the numerator is a scalar.

Examples

• hq = qfilt;
  ismaxphase(hq)
  

returns 1 so this is a maximum phase quantized filter. Notice that the filter coefficients (zeros) are 1.0 before quantization. Compare to isminphase.

See Also
isallpass, isfir, islinphase, isminphase, isreal, issos, isstable

islinphase

isminphase