info

Information about digital filter

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Syntax

s = info(d)

Description

example

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

Examples

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Information on a Lowpass FIR Filter

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

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

s = 17x44 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     : N/A (normalized frequency)'
    'Response        : Lowpass                   '
    'Specification   : Fp,Fst,Ap,Ast             '
    'Stopband Edge   : 0.45                      '
    'Passband Ripple : 1 dB                      '
    'Stopband Atten. : 60 dB                     '
    'Passband Edge   : 0.4                       '

Input Arguments

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`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.