TELEVISION SYNCHRONIZING BROADCAST EQUIPMENT
PURPOSE:To facilitate synchronizing broadcast even when a reception station and a transmission station are separated by separating a synchronizing broadcast equipment into the reception section and the transmission section and sending a synchronizing signal together with an IF signal via a transmiss...
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Format: | Patent |
Sprache: | eng |
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Zusammenfassung: | PURPOSE:To facilitate synchronizing broadcast even when a reception station and a transmission station are separated by separating a synchronizing broadcast equipment into the reception section and the transmission section and sending a synchronizing signal together with an IF signal via a transmission line between them. CONSTITUTION:A part of a signal received by a receiver 2 in the reception station is extracted, it is used as a reference signal 7 and inputted to a synchronizing broadcast signal adaptor 12, which synthesizes the frequency and the result is outputted as a synchronizing signal 13. The synchronizing signal 13 is synthesized with an output IF signal 17 of the receiver 2 by a synthesizer 11 and sent to a transmission station through a transmission line 14. In the transmission station, a branching filter 15 branches the synthesized signal into an IF signal 18 and a synchronizing signal 16, the IF signal 18 is inputted to a transmitter 4, and sent, and the synchronizing signal 16 is inputted to a synchronizing broadcast signal adaptor 19, where the signal is subjected to phase comparison with a comparison signal 8 extracted from an output signal 5 and its output signal 10 controls a local oscillator 9. |
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