METHOD FOR REMOTE MESSAGE TRANSMISSION AND DEVICE WHICH IMPLEMENTS SAID METHOD Russian patent published in 1997 - IPC

FIELD: radio engineering, in particular, protection and security alarm systems for cars, apartments, safes and so on. SUBSTANCE: instead of standard radio communication systems which use harmonic signals for information transmission and oscillating circuits for their detection, described method involves transmission of message by means of noise-like signal with low spectral density. Selection of signals is performed by means of correlator. When spectral density is less than natural noise level, such systems provide no interference for standard radio devices. Device may be used as basis for security system which covers many objects, such as cars in large city. EFFECT: confidential information transmission, possibility of independent simultaneous operations of many devices of this type. 2 cl, 3 dwg