isfir
Determine if digital filter has finite impulse response
Syntax
Description
Examples
FIR and IIR Digital Filters
Use designfilt
to design FIR and IIR versions of a highpass filter. Specify a normalized stopband frequency of 0.3 and a normalized passband frequency of 0.6. Verify that each filter is of the correct class. Display the frequency responses of the filters.
fir = designfilt('highpassfir','StopbandFrequency',0.3,'PassbandFrequency',0.6); iir = designfilt('highpassiir','StopbandFrequency',0.3,'PassbandFrequency',0.6); isfirFIR = isfir(fir)
isfirFIR = logical
1
isiirFIR = isfir(iir)
isiirFIR = logical
0
fvt = fvtool(fir,iir); legend(fvt,'FIR','IIR')
Input Arguments
d
— Digital filter
digitalFilter
object
Digital filter, specified as a digitalFilter
object. Use designfilt
to generate a digital filter
based on frequency-response specifications.
Example: d =
designfilt('lowpassiir','FilterOrder',3,'HalfPowerFrequency',0.5)
specifies a third-order Butterworth filter with normalized 3 dB frequency 0.5π
rad/sample.
Output Arguments
flag
— Filter class identification
logical scalar
Filter class identification, returned as a logical scalar.
Version History
See Also
designfilt
| digitalFilter
| firtype
| isdouble
| issingle
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