| 摘要 |
PURPOSE:To multiplex data, and to increase the transmission capacity of data, by constituting a frame synchronizing system which uses three lines adjacent to each other, in a vertical blanking period of the first and the second fields, and inserting a synchronizing pulse into only one of the alternating fields. CONSTITUTION:A transmitting part B is connected to a picture signal generating device A for outputting a vertical synchronizing signal VD, a horizontal synchronizing signal HD, a carrying signal fsc and a picture signal V, and a receiving part D is connected to the transmitting part B through a transmission part C. An N-fold carrying signal is separated from a transmission signal by a synchronizing signal separating circuit 7 of this receiving part D, and a carrier wave signal whose phase synchronizes with said carrying signal is regenerated by a PLL circuit 8. Also, a pseudo horizontal synchronizing signal is regenerated by a pseudo horizontal synchronzing signal regenerating circuit 9, and a vertical synchronizing signal is regenerated by a synchronizing signal regenerating circuit 10. Subsequently, synchronization of three lines of a vertical blanking period of the first and the second adjacent fields is executed from a frame synchronizing pulse sent from the transmitting part B and a signal modulated by an N-fold carrier wave, and data can be multiplexed. |
