DIGITAL TV SYSTEM Russian patent published in 2001 - IPC

FIELD: digital television broadcasting in decimetric wave range allotted for analog television. SUBSTANCE: digital TV system including transmitting side incorporating photoelectric converter, former of brightness signal and two polychromatic signals, four analog-to-digital converters, generator of sinusoidal oscillations, frequency divider, former of group signal and radio signal transmitter and receiving side incorporating unit receiving radio signal, double-pole amplitude detector, two pulse formers, channel of brightness signal, channels of first and second polychromatic signals, each including key, output register and digital-to-analog converter, audio signal channel including two keys, two units of registers and digitalto-analog converters is supplemented at transmitting side with pulse distributor and at receiving side with sensor control unit, radio frequency amplifier, channel forming control signals from unit of extraction of code of synchronization pulse, generator of discretization pulses, self-feed pulse distributor, key, pulse counter, decoder, pulse former and flip-flop. Channels of brightness signal and polychromatic signal were each added with three flip-flops, two keys, three output registers, adder and four units of delay elements. Information is transmitted on upper side frequency of carrier frequency. EFFECT: possibility of operation of system with lesser clock frequency and reduction of occupied band of frequencies. 12 dwg