DTMF Based Automation System with Reduction of Noise Using Goertzel DFT Estimation

In recent years, intelligent network based Automation Systems are developed in industrial, commercial and residential sectors. The idea of managing the devices remotely can be implemented using various wireless technologies such as ZigBee, GSM/GPRS, Bluetooth, but these technologies require development of software, dedicated devices and network establishment schemes. Hence the implementation becomes time consuming and moreover they make the system costly. This paper presents a more liable Mobile Controlled Automated System based on DTMF (Dual Tone Multiple Frequency) principle which is cost effective. It uses Mobile as a controlling device and prevailing infrastructure of the Telephone System at the receiver end. Also using Goertzel DFT estimation the noise in the system is eliminated and its complete analysis is presented.