| 摘要 |
Receivers ( 1 ) comprising television and radio inputs ( 11,12 ) for receiving television and radio signals and comprising switching circuits ( 2 ) with two first switches ( 21,22 ) to be activated in a first mode and located parallelly to the television input ( 11 ) and with two second switches ( 23,24 ) to be activated in a second mode and located anti-serially to the radio input ( 12 ), and control circuits ( 3 ) for controlling the switching circuits ( 2 ) are modified in such a way that strong radio signals can no longer disturb the television signals. Thereby one of the first switches ( 21 ) and one of the second switches ( 23 ) together isolate the inputs ( 11,12 ) from each other, and the control circuit ( 3 ) supplies a first control signal to the first switches ( 21,22 ) and supplies a second control signal to non-common points of the anti-serial second switches ( 23,24 ). This kind of receivers ( 1 ) no longer need different switching circuits ( 2 ) for shielded radio inputs and unshielded radio inputs. The switches ( 21,22,23,24 ) are diodes, and the control circuit ( 3 ) comprises transistors ( 31,32 ) for controlling the diodes.
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