| 摘要 |
FIELD: procedure of transmission of several messages simultaneously in the same frequency channel; transmission of additional sound programs or discrete information in transmitter paths of MHF FM radio broadcasting net and television sound tracking; additional radio channels are created at subcarrier frequencies in those parts of the frequency band spectrum of transmitters that are not occupied by the main signal. SUBSTANCE: the specific feature of the device that differs it from the prototype consists in the fact that with the aim of provision of electromagnetic compatibility of the channels of radio broadcasting transmitters multiplexed by two additional channels, in the broadcasting nets, realized both at 100-kMz and 30-kH frequency spectra, the subcarrier frequencies for the additional channels are selected proceeding from the following relation: 1. F= 30[1+n(0,5÷0,6)]kHz,, 2. F= n•f. where f- picture line frequency in television system, n= 2,3,4,5; n= 1,3,5. Frequencies, whose values satisfy conditions 1 and 2 at the same time are taken as subcarrier frequencies for creation of additional channels. EFFECT: enhanced electromagnetic compatibility of channels. |
