Giving Concept of an Analog Notch Filter for Removing Interference from Engineering Systems to Engineering Students
Abstract
Power lines exist everywhere. Interference of power frequency with signals of other systems (telephone, music, and so on) is inevitable. This results in deteriorating the quality signals of other systems to be used for accomplishing required tasks. In this paper, a continuous-time notch filter is employed for removing the interference or annoying hums caused by the powerline frequency or its second or third harmonics in two engineering systems, namely the telephone transmission system, and the tape deck system. The notch filter accomplishes this task by attenuating the magnitude of the interference signal at a notch frequency to zero (ideally speaking). The paper may serve as a starting point for the engineering students who want to learn the basics of analog filters. MATLAB/Simulink based simulation results display that the notch filter can successfully filter out power frequency interference/hums or its harmonics to get the required quality signal at the output.
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