METHOD OF SYNCHRONIZATION IN CONDITIONED INFORMATION SIGNAL TRANSMISSION SYSTEM Russian patent published in 1997 - IPC

FIELD: procedure of paid access to voice synchronous translations of satellite TV programs. SUBSTANCE: the method consists in transmission of a synchronous sequence and other service information in intervals of the information signal. On the transmitting side the device has detector 1 of intervals in analog signal, generator 2 of wide-band signals of sync pulse zeros and unities, adder 3, shift register 4, modulo 2 addition circuit 5, communication channel 6; on the receiving side it has filter 7 matched with the sync pulse unity signal, filter 8 matched with the signal below the sync pulse, delay line 9, device 10 for suppression of wide-band signals, solver 11 shift register 12, coding converter 13, digital converters 14, 15 decoding converter. EFFECT: creation of coded broadcasting of synchronous translations (at a limited frequency band of the communication channel) at the minimum time of coming into synchronism of the receiving systems, with the maximum carrying capacity of the service channel for transmission of address and key information with the minimum distortion of voice signals at decoding. 4 cl, 1 dwg