info

Information about digital filter

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Syntax

s = info(d)

Description

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

example

Examples

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Open Live Script

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

d = designfilt("lowpassfir",FilterOrder=6, ...
    PassbandFrequency=0.4,StopbandFrequency=0.45);
s = info(d)
s = 25×42 char array
    'FIR Digital Filter (real)                 '
    '-------------------------                 '
    'Filter Length  : 7                        '
    'Stable         : Yes                      '
    'Linear Phase   : Yes (Type 1)             '
    '                                          '
    'Design Method Information                 '
    'Design Algorithm : Equiripple             '
    '                                          '
    'Design Options                            '
    'Density Factor  : 16                      '
    'Maximum Phase   : false                   '
    'Minimum Phase   : false                   '
    'Stopband Decay  : 0                       '
    'Stopband Shape  : flat                    '
    'Uniform Grid    : true                    '
    'Passband Weight : 1                       '
    'Stopband Weight : 1                       '
    '                                          '
    'Design Specifications                     '
    'Sample Rate   : N/A (normalized frequency)'
    'Response      : Lowpass                   '
    'Filter Order  : 6                         '
    'Passband Edge : 0.4                       '
    'Stopband Edge : 0.45                      '

Input Arguments

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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

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Information table, returned as a character array.

Version History

Introduced in R2014a

See Also

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