Abstract: Digital filter plays a significant role in the advanced area of communication system as it provides high attenuation to the unwanted signals and at same time offers very low attenuation to the desired signals.In this paper, Low pass filter is designed using different window techniques namely Bartlett Hanning, Blackman Harris and Nuttal. Design of FIR filter is done in MATLAB by FDATOOL low pass filter is designed with sampling frequency 48000Hz and cut-off frequency 10000Hz magnitude, phase impulse, step response and pole, zero plot. Here the Magnitude and phase response in time and frequency domain ofthese window techniques have been compared using MATLAB simulation.

Keywords: FIR, Digital filter, DSP, Low pass filter, MATLAB, FDATOOL in MATLAB, Bartlett Hanning Window, Blackman Harris Window, Nuttal Window techniques.