Design and Implementation of DTMF Detector

Basic Extension Module for Embedded System Prototype By: Ivan Christian adn Daniel Widyanto < p class=”Section1″> Introduction Telephone units are ubiquitous. They can be found in almost every house. In some houses that has many rooms a line is paralleled so that anybody can receive and make call from different rooms. Their presence could be used for other purposes instead of making call per se. Application of this module can be found in smart home automatic system which incorporates telephone unit as input module. By using telephone unit somebody can make a control action to a remote system, as far as the telephone line can reach. To do so, such an interface between telephone line and the control system is needed. DTMF Detector 2.0 is designed for the purpose. 1. Description DTMF Detector 2.0 is a microcontroller system extension module which detects the presence of DTMF tones, and then decodes the tones to coded binary digits. By using DTMF Decoder 2.0 design engineer could interface the analog signal of telephone line with digital logic of microcontroller system in straight ahead manner. 2. Module Specifications The module specifications are as follows: 1. Input: · DTMF tones from telephone line (analog signal)…

Continue reading