| 摘要 |
A circuit for concurrently recording at least two picture signals, each received from at least two different desired television broadcasting channels, on a single video tape in a video tape recorder, and for concurrently reproducing at least two picture signals from a single video tape on which at least two different television broadcasting channels are recorded, in a video tape recorder provided with such video tape. First and second vertical synchronization detection circuits 104, 105 detect each vertical synchronization signal from first and second video signal input terminals VD1, VD2. A recording controller 106 receives the vertical synchronization signals that are detected by the first vertical synchronization detection circuit I04 and the second vertical synchronization signal detection circuit 105, and therefrom produces a first memory control signal, a first mixing control signal and a first selection control signal. Memory 102 receives the digital signals converted by the first A/D convention circuit 101 and stores the received digital signals under control of the first memory control signal. A first mixing circuit 107 thereby produces a mixed signal in a half frame unit. A first selection circuit 108 selects either the output of the first mixing circuit 107 or the input signals of the first and second video signal input terminals VD1, VD2 according to the first selection control signal of the recording controller 106.
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