| 摘要 |
PURPOSE:To prevent out of synchronization of a frame at the time of switching by matching all the synchronisms of respective TV signals at the position of the change-over contacting point of a switch matrix. CONSTITUTION:The output of a transmitter is synthesized for discrimination of transmitted irradiation by a wave synthesizer 7, and transmitted from t-pieces of transmission antenna 81-8t. A switch control circuit 5 controls a switch matrix circuit 4 with a connection correspondence table signal and a switch command signal from a ground control station. The circuit 5 monitors the phases of respective TV signals in the position of the change-over contacting point of the switch matrix circuit 4, and controls so that a switching action is completed within a short time from the point of time when the frame synchronizing signals of such TV signals as synchronous with each other comes to a prescribed position (phase). As a result, TV signals transmitted from the satellite do not produce out of synchronism, and the quality of the signals can be prevented from deteriorating. |
