METHOD OF TRANSMISSION OF DISCRETE INFORMATION OVER ANALOG COMMUNICATION CHANNEL Russian patent published in 2001 - IPC

FIELD: radio engineering. SUBSTANCE: method of transmission of discrete information over analog communication channel can be used in systems transmitting discrete information with pulse-duration modulation or frequency shift-keying of signals. Characteristic feature of method lies in transmission of current pulses of stable amplitude provided by its comparison with threshold value over communication channel and in extraction of difference current signal for adjustment of amplitude of pulses of transmitted voltage proportional to resistance of communication channel which change is employed to evaluate reliability of data transmission. EFFECT: improved protection of information against unauthorized access and enhanced authenticity of data transmission due to testing of parameters of communication channel right in process of formation of modulated electric signal. 2 dwg