FIR Digital Filter MATLAB source code
This section of MATLAB source code covers FIR digital filter matlab code. It describes FIR filter as per rectangular,Bartlett,Blackman,Chebyshev,Hamming and Hanning window types.
This page covers FIR Digital Filter with window type as Hamming window. The same is used by 'fir1' matlab function by default.
FIR digital filter operates on digital sample values. It uses current and past input samples to produce a current output sample. It does not use previous output samples. There are various types of FIR filter based on need viz. low pass,high pass, band pass and band stop.Low pass filter is described in the below code.
FIR Filter Specifications
Following points are usually considered to design FIR filter other the window type.
• Window Type
• Passband and stopband ripples
• passband and stopband edge frequencies
• sampling frequency
• order of the filter
• window coefficients
• magnitude and phase responses
Entering Input parameters
rs=input('enter the stopband ripple(Example:0.01):');
fp=input('enter the passband freq(Example:1500):');
fs=input('enter the stopband freq(Example:2000):');
f=input('enter the sampling freq(Example:6000):');
MATLAB built-in 'fir1' MATLAB function
% low-pass filter
figure,plot(o/pi,m);title('FIR Filter Response');ylabel('Gain in dB');xlabel('Normalised frequency');
INPUT and OUTPUT of Low Pass FIR filter
Low Pass and High Pass FIR Filter using kaiser,rectangular and triangular window method
Useful Links to MATLAB codes
Refer following as well as links mentioned on left side panel for useful MATLAB codes.
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Low Pass FIR