| 摘要 |
PURPOSE:To use both of a chargeable broadcast decoder and an MUSE decoder in common for a second satellite broadcast receiver, as well by inputting a keyed AFC pulse outputted from the MUSE decoder to a second satellite broadcast receiver, as well. CONSTITUTION:A keyed AFC pulse outputted from an AFC output terminal 38 of an MUSE decoder 35 is inputted from an AFC input terminal 56, and as an AFC input 61, a first satellite broadcast receiver 51 is subjected to keyed AFC operation at the time of receiving an MUSE broadcast. On the other hand, a keyed AFC pulse from the terminal 56 passes through an AFC terminal, and an AFC input terminal 34 of a second satellite broadcast receiver 31 and is inputted to a receiver 31. Since a first switch 63 is closed, when it is not connected to the receiver 31, an AFC signal is terminated by 75 ohms through the switch 63, the switch 63 is in a closed state, when it is connected to the receiver 31, and the AFC signal is terminated in the receiver 31. Even if it is connected to the receiver 31 or not connected, the AFC signal is always terminated by 75 ohms, and a level of the keyed AFC pulse is not varied, therefore, both the satellite broadcast receivers 51, 31 can execute a normal AFC operation.
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