Measurement System of Information Signal in Display Image leaking from Conducted Emission on Power leads of a Personal Computer

In the present study, we developed a measurement system of the information signal related with the display image in the conducted emission on the power leads of a PC. The information signal has been defined as the signal emitted by the change of the RGB signals that produces the display image, and measured using the signal-to-noise ratio in our previous studies. The measurement system was composed of a pair of line impedance stabilization networks and two receivers. check the validity of the measurement system, test experiments were carried out to measure the information signal. In addition, the reconstructed image was produced from the same conducted emission. The comparison results revealed that the measured S/N level correlated with the quality of the reconstructed images.