MULTIPLEXING OF DIGITALLY ENCODED NTSC AND HDTV SIGNALS OVER SINGLE MICROWAVE COMMUNICATION LINK FROM TELEVISION STUDIO TO TOWER TRANSMITTER FACILITY FOR SIMULTANEOUS BROADCAST (SIMULCAST) TO CUSTOMER SITES BY TRANSMITTER FACILITY

摘要

Simulcasting from a television transmitter facility of both NTSC video signals, via a UHF/VHF portion of the broadcast spectrum, and digital HDTV signals, over a prescribed UHF portion of the broadcast spectrum, by converting the NTSC video signals into digital format at the television studio and multiplexing the digitally formatted NTSC signals and digital HDTV signals into a combined NTSC/HDTV digital television signal, which vision signal is transmitted over a common microwave radio frequency communication channel linking the television studio with the television transmitter facility. The combined NTSC/HDTV digital television signal is demultiplexed into separate HDTV and NTSC video digital signals. The digital NTSC video signals are converted into analog NTSC format, and the NTSC video signals and the HDTV signals are simulcast from the television transmitter facility.