| 摘要 |
Interface device receiving video signals from a peripheral receiving coded television signals, characterised in that the signals are received on a synchronisation-video separator and on a line detector, the said separator being followed by a line-frequency oscillator and by a test card generator connected to the receiver to permit adjustment to the modulation thereof, the said line detector selecting the chrominance signals of one type and being followed by a circuit having half line frequency and reset, connected to the line frequency oscillator, as well as an oscillator operating at the limiting frequencies of deflection and which emits frame-identifying signals, the said synchronisation-video separator also being connected downstream, on the one hand to a monostable connected to the line detector and to the switching control for the frame-identifying signals, and on the other hand to a frame synchronising circuit associated with a counting circuit connected to the line frequency oscillator, actuating the control of the frame identification and emitting on the test lines. <IMAGE>
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