Efficient Audio Noise Reduction System Using Butterworth Chebyshev and Elliptical filter

Digital signal processing is widely used to manipulate, modify, enhance or filter signals such as speech, audio, image and telecommunication signal.Signals can be processed in the analog domain, but the digital domain offers high speed, better accuracy, greater flexibility increased storing capabilities and simple implementation.The audio signal noise reduction has become a fundamental area of research for many real world applications.There are two forms of filters one is fixed, and another one is tunable.Fixed filters measure those within which passband frequencies and stop band frequencies, square measure mounted whereas just in case of tunable filters, passband and stop band frequencies measured variable.These frequencies will be modified consistent with the need of the applications.Tunable digital filters are widely used in medical electronics, digital audio instrumentation, telecommunications and control systems.It is often the essential requirement for removal of noise from the audio signal.