tf
Convert digital filter to transfer function
Syntax
Description
Examples
Highpass Filter Transfer Function
Design a 6th-order highpass FIR filter with a passband frequency of 75 kHz and a passband ripple of 0.2 dB. Specify a sample rate of 200 kHz. Compute the coefficients of the equivalent transfer function.
hpFilt = designfilt('highpassiir','FilterOrder',6, ... 'PassbandFrequency',75e3,'PassbandRipple',0.2, ... 'SampleRate',200e3); [b,a] = tf(hpFilt)
b = 1×7
0.0003 -0.0019 0.0048 -0.0064 0.0048 -0.0019 0.0003
a = 1×7
1.0000 4.0580 7.5656 8.1243 5.2561 1.9348 0.3164
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
num
— Numerator coefficients
row vector
Numerator coefficients, returned as a row vector.
Data Types: double
den
— Denominator coefficients
row vector
Denominator coefficients, returned as a row vector.
Data Types: double
Version History
Introduced in R2014a
See Also
designfilt
| digitalFilter
| ss
| zpk
Commande MATLAB
Vous avez cliqué sur un lien qui correspond à cette commande MATLAB :
Pour exécuter la commande, saisissez-la dans la fenêtre de commande de MATLAB. Les navigateurs web ne supportent pas les commandes MATLAB.
Select a Web Site
Choose a web site to get translated content where available and see local events and offers. Based on your location, we recommend that you select: .
You can also select a web site from the following list:
How to Get Best Site Performance
Select the China site (in Chinese or English) for best site performance. Other MathWorks country sites are not optimized for visits from your location.
Americas
- América Latina (Español)
- Canada (English)
- United States (English)
Europe
- Belgium (English)
- Denmark (English)
- Deutschland (Deutsch)
- España (Español)
- Finland (English)
- France (Français)
- Ireland (English)
- Italia (Italiano)
- Luxembourg (English)
- Netherlands (English)
- Norway (English)
- Österreich (Deutsch)
- Portugal (English)
- Sweden (English)
- Switzerland
- United Kingdom (English)