info

Information about digital filter

Syntax

s = info(d)

Description

s = info(d) returns a character array with information about the digital filter, d.

Examples

Information on a Lowpass FIR Filter

Design a lowpass FIR filter with normalized passband frequency $$0.4\pi$$ rad/sample and normalized stopband frequency $$0.45\pi$$ rad/sample. Obtain information about the filter just designed.

d = designfilt('lowpassfir','PassbandFrequency',0.4,'StopbandFrequency',0.45);
s = info(d)

s = 16x32 char array
    'FIR Digital Filter (real)       '
    '-------------------------       '
    'Filter Length  : 81             '
    'Stable         : Yes            '
    'Linear Phase   : Yes (Type 1)   '
    '                                '
    'Design Method Information       '
    'Design Algorithm : Equiripple   '
    '                                '
    'Design Specifications           '
    'Sample Rate     : 2 (normalized)'
    'Response        : Lowpass       '
    'Passband Ripple : 1 dB          '
    'Stopband Atten. : 60 dB         '
    'Passband Edge   : 0.4           '
    'Stopband Edge   : 0.45          '

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

s — Information table

character array

Information table, returned as a character array.

Version History

Introduced in R2014a