Communication System to Transmit & Receive Coded Information through Video Signal

Transmission of information from a source to a destination can be performed in many ways by the use of electrical signals and electric-electronic circuits. To design a communication system is primordial to define some parameters, such as, the physical medium in which the signal will be transmitted, the way in what the signal would be generated and the nature of signal, it means if the signal will be analogical or digital. In this work, a communication system was designed, built up and debugged to transmit and receive two kinds of signals by the use of an unique transmit medium in a simultaneously way. One of these signals is an analogical NTSC video signal and the other is a digital data signal from a PC application. The purpose of this system is to transmit, in a safe and efficient way, coded information from a PC to another by the combination of signals with the Time Division Multiplexing technique (TDM), using a coaxial cable as the physical medium of transmission. To achieve this purpose the system is conformed by hardware elements such as, the PIC16F874 micro-controller and software elements implemented as a communication protocol to identify the information transmitted. This document shows all the information about circuits, tests and images from oscilloscope related with the communication system.