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a digital signal processing is a main branch of electronics. It is concerned with the representation by sequence of number or symbol and the processing of these signals. Dsp have many more applications which are useful in our life i.e. Telecommunication, image processing, speech processing, medical diagnostic instrumentation and signal filtering etc. Signal filtering is the most important application of dsp. In this process we can remove all the unwanted background noise and interference. In this paper we are concentrating on low pass fir filter design by using rectangular, blackman, hanning and bartlett window techniques. By the comparative analysis of all the window technique we conclude that, rectangular window technique possess the better magnitude and phase response as when compared with blackman, hanning and bartlett window technique.

Magnitude and Phase Response of Low Pass Fir Filter Using Rectangular, Blackman, Hanning & Bartlett Window Techniques