Luetooth Stereo Audio System with Active Noise Cancelation

Abstract

although, sound systems are obtainable for outdoor use, battery-powered audio devices are what is mostly found in today’s portable music. Using a class D Audio amplifier, it is possible to couple a Bluetooth device with the amplifier, coming up with a system that can receive and process audio signals through Bluetooth connection. With every communication system, Noise is always considered as unwanted signal. The signal to noise ratio statistical characteristics in practical application can’t be learned or are usually unknown so that we barely design fix coefficient digital filter in insinuation to the noise problem in the Bluetooth stereo audio system.The “on-line” FIR or IIR filter weights of active noise and vibration control systems of an adaptive algorithm used for optimizing is basically derived from adaptive algorithms used in systems such as telescope adaptive optics and telephone echo-cancellers to cancel unwanted” noise “optics and thus develop distant star signals.In this work an adaptive noise cancellation system is designed to minimize the noise in the Bluetooth stereo audio system. Using the least mean square (LMS) algorithm, the coefficient of the filter in the active noise cancellation system is altered in variation to noise signal characteristics, which in turn made the active noise system adaptive.