Paper on Frequency based audio Noise Reduction using Butter Worth, Chebyshev & Elliptical Filters

Abstract

Noise from the audio signal is removed by using Audio Noise Reduction System. Audio noise reduction systems uses filters for removal of noise. Filters are the manipulation of the amplitude and/or phase response of a signal according to their frequency. These are the basic components of all signal processing and -telecommunication systems. There are two kinds of filters- fixed and tunable. Fixed filters are those in which passband frequencies and stopband frequencies are fixed whereas in case of tunable filters, passband and stopband frequencies are variable. These frequencies can be changed according to the requirement of the applications. Tunable digital filters are widely employed in telecommunications, medical electronics, digital audio equipment and control systems. This is the basic need for removal of noise from the audio signal.