Filter Design Toolbox

isfir

Test quantized filters to see whether they are FIR filters

Syntax

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

Description

flag = isfir(hq) determines whether quantized filter hq is an FIR filter, returning flag equal to 1 when the quantized filter is an FIR filter, and 0 when it is IIR.

flag = isfir(hq,k) determines whether the kth-section of quantized filter hq is an FIR filter, returning flag equal to 1 when the kth-section is an FIR filter and 0 when it is IIR.

isfir(hq) looks at filter hq and determines whether the filter, in transfer function form, has a scalar for its denominator. If it does, it is an FIR filter.

Examples

• hq = qfilt;
  isfir(hq)
  ans =
  
       1
  

returns 1 for the status of filter hq; the filter is an FIR structure with denominator reference coefficient equal to one.

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

isallpass

isfixed