| 摘要 |
A television receiver includes first and second signal receiving circuits corresponding to first and second channels, each circuit having a tuner and VIF amplifier with each tuner being response to a tuning control voltage supplied thereto; first and second storage elements for storing the respective tuning control voltages and supplying the same to the first and second tuners, respectively; a feedback circuit connected in common between each of the tuners and its respective storage element and selectively operative to supply a tuning control voltage to one of the first and second storage elements; a first switching device connected between the feedback circuit and the first and second tuners and a second switching device connected between the feedback circuit and the first and second storage elements; a channel selection device for energizing the first and second switching devices to connect the feedback circuit between the first or second tuners and first or second storage elements, respectively, in response to the selection of one of the channels; a control circuit for supplying channel input data to the feedback circuit in response to the channel selection for controlling the operation of the feedback circuit; and first and second automatic fine tuning circuits for maintaining the value of the tuning control voltage in the first and second storage elements at a constant value after the feedback circuit is no longer operative with the first and second signal receiving circuits, respectively.
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