Abstract: The aim of this paper is to design FIR filter of the order 30 using various window function methods. Digital filter are widely used in the world of communication and computation. On the other hand to design a Digital Finite Impulse Response (FIR) Filter that satisfies. This paper presents the importance of filter in signal processing. Digital filter are two type 1. FIR and 2. IIR. These are various methods for filter designing. This paper discuss the window method low pass fir filter designing rectangular, taylor and Kaiser window function methods are presented. 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. We found that filter designing by window method is easy and fast.

Keywords: FIR Digital filter, DSP, low pass filter, window function, MATLAB, FDATOOL in MATLAB, rectangular window, taylor window, and Kaiser window techniques.