CODE DEVICE Russian patent published in 1997 - IPC

FIELD: electronic devices applicable in protection of objects from unauthorized access, first of all, in locks of nay degree of protection. SUBSTANCE: the offered code device consists of key and circuit controlled by key, two generators of pseudo-random sequences, two receivers, two transmitters pulse generator, detaining circuit, single bit comparator, reversible counter, control and actuating devices, time interval generator, two circuits of initial setting, generator of oscillations, two members of communication, two power supply sources and control member. Introduction of key into socket of control circuit results in activation of device for a definite time interval. In this case, members comparison takes place of code sequences generated by two generators of pseudo-random sequences. In case of their coincidence, actuating device is engaged. EFFECT: higher efficiency. 1 dwg