**FIR Filter Design**

**AIM**

**:-**To design FIR digital filters.

**THEORY: -**FIR – filter is a finite impulse response filter. Order of the filter should be specified. Infinite response is truncated to get finite impulse response. placing a window of finite length does this. Types of windows available are Rectangular, Barlett, Hamming, Hanning, Blackmann window etc. This FIR filter is an all zero filter.

**PROGRAM: -**

n = 20;

fp = 200;

fq = 300;

fs = 1000;

fn = 2 * fp / fs;

window = Blackman ( n+1 );

b= fir1 ( n, fn , window ) // low pass filter //

[ h w ] = freqz( b, 1, 128 );

plot( w/pi , abs(h) )

**RESULT: -**A LPF is designed using Blackman window.

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