An Application of 68HC12 Micro-Controller

In this paper an application of 68HC12 micro-controller has been explained. Texas instrument Digital Signal Processing (DSP) board, 16-bit Motorola Micro-Controller (MC68HC12), and C++ programming are used to develop a method for explaining different types of audio filters. One application of this tool is for eliminating audio feedback in a Public Audio (PA), or sound reinforcement system. An audio noise occurs when an input device (microphone) picks up its own signal from the output device (speaker) thus creating a loop. The result is a loud noise coming from the speakers.