Noise generator of interfering signals for suppression information leakage signal generated by liquid crystal monitor screen

Abstract

The processes of signal generation in display adapter of personal computer monitors are considered, and a spectral representation of the indirectly radiated signal for the final analysis time is found for a simplified (with two shades) static image. The comb structure of the linear path frequency response of a specialized intelligence tool, which is best able to receive side radiation signals generated by personal computer monitors, is substantiated. It was concluded that for high-quality signal interception by a specialized intelligence tool, it is necessary to estimate the synchronization periods of frames and columns of a display screen. The structure of a noise generator built as a source of digital white noise, a digital comb filter and an antenna, is substantiated. The transfer function of the digital filter was found and calculation of its parameters was carried out. An algorithm for processing digital white noise is presented to achieve effective suppression of the information leakage channel for liquid crystal structure monitor screens