Design and Implementation Low Pass FIR Digital Filter Using Windowing Techniques

A filter can need to have a certain frequency response, or a particular reaction to an impulse, step, or ramp, or mimic an analogue system. Digital filters can be categorised into Finite Impulse Response (FIR) filters & Infinite Impulse Response (IIR) filters depending on the system response. The thesis addresses FPGA low pass FIR filter design. Theoretical and experimental findings conducted FIR low pass filter point to the window design approach as very straightforward and user-friendly due to the presence of well-defined equation. Comparison indicated that the Direct-Form structure technique is simpler and performs better than other typical filter structures whereas Kaiser window gives the minimal main-lobe width and a sharp cut-off indicating smaller transition width. Experimental research of coefficient quantisation reveals a link between the frequency response, number of coefficients, and bit count. Key words: Digital Signal Processing (DSP),Finite Impulse Response (FIR) Filter, Low- Pass Filter, Verilog HDL, Windowing Techniques, Hamming Window, Hanning Window.