Verify if filter System object is FIR



flag = isfir(sysobj) determines whether the filter System object™ is an FIR filter. If the filter is an FIR filter, isfir returns 1.

To determine whether sysobj is an FIR filter, the isfir function inspects if the filter in the transfer function form has a scalar denominator. If it does, it is an FIR filter.


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Design a Lowpass FIR Filter.

d = fdesign.lowpass;
h = design(d,'Systemobject',true)
h = 
  dsp.FIRFilter with properties:

            Structure: 'Direct form'
      NumeratorSource: 'Property'
            Numerator: [1x43 double]
    InitialConditions: 0

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Determine if the filter is an FIR filter using the isfir function.

ans = logical

isfir returns 1 to indicate that the filter is an FIR filter.

Output Arguments

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Flag to determine whether the filter is FIR, returned as a logical scalar. If the filter is FIR, isfir returns a logical 1, else it returns a logical 0.

Data Types: logical

Introduced in R2011a