JPH0379791B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a video tape recorder switching device used for educational purposes, etc., and seeks to provide a device that can switch and use a plurality of video tape recorders by remote control. It is something to do.

It is desired that a plurality of video tape recorders installed at the center be remotely controlled in each classroom and the images displayed on television receivers installed in each classroom. The present invention aims to provide a video tape recorder switching device suitable for this demand, and one embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, an input terminal 1 receives a data signal transmitted from a terminal. This data signal is the VTR selection code and operating mode code. This data is passed through the demultiplexer 3 to the demodulator 5.
The signal is demodulated and applied to the logic circuit 6. A logic circuit 6 generates a signal based on the data signal, which controls a plurality of VTRs (video tape recorders) 7, 8, and 9. VTR7,8,9
The signals obtained at the video signal output terminals 11, 13, and 15 are applied to the video switching circuit 16. A signal is applied to this video switching circuit 16 from the logic circuit 6, and the video signals of the VTRs 7, 8, and 9 in operation are configured to be outputted to an output terminal 17. Similarly, the audio signal output terminals 10 and 1 of VTRs 7, 8, and 9
The audio signals No. 2 and 14 are applied to the audio switching device 18. The output of the logic circuit 6 is this audio switcher 18
is also added to the output terminal 19, and the audio signals of the VTRs 7, 8, and 9 in operation are controlled so that they are outputted to the output terminal 19. The video signal outputted to the output terminal 17 and the audio signal outputted to the output terminal 19 are modulated, and transmitted through a transmission path to a television receiver provided on the terminal device side, where they are displayed and emitted as sound.

The output of the logic circuit 6 is modulated by the modulator 4, passes through the demultiplexing mixer 2, and is returned to the terminal side from the terminal 1.
Informs whether control has been performed according to the data signal sent from the terminal.

FIG. 2 shows a video switcher 16 and an audio switcher 18.
The concrete circuit side of is shown. 4 VTRs 7, 8, 22,
9 is used. The video signals of VTRs 7 and 8 are connected to terminals 23a and 2 of the switch of relay 23.
3b, and the video signals of the VTRs 22 and 9 are applied to terminals 24a and 24b of the changeover switch of the relay 24. The audio signals of VTRs 7 and 8 are applied to terminals 25a and 25b of terminal relay 25, and
The audio signals 22 and 9 are sent to the terminals 26a of the relay 26,
26b. Relay 23, 24, 25,
Transistors 27, 28, 2 are connected to the coil 26.
9 and 30 are connected in series, and their bases are connected to the output terminal of the logic circuit 6. When the VTR 7 is selected, the transistor 27 and the transistor 29 are made conductive by the output from the logic circuit 6, the changeover switches 23 and 25 are switched to the terminals 23a and 25a, and the video signal of the VTR 7 is sent to the output terminals 17 and 19. , an audio signal is output. When another VTR is selected, the video and audio signals of the VTR in operation are obtained at the output terminal in the same manner.

As described above, according to the present invention, a plurality of video tape recorders can be switched and used by remote control using signals from a terminal device, and a plurality of video tape recorders can be installed at a center in a school, and each classroom The video tape recorder can be switched and used with the terminal, and by providing a modulator that modulates the output of the logic circuit and returns it to the terminal, control can be performed according to the data signal sent from the terminal. Since it is possible to check on the terminal device side whether or not the device has been used, the reliability of the device can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a video tape recorder switching device according to an embodiment of the present invention, and FIG. 2 is a diagram showing a part of the same device as a concrete circuit. 1...Terminal, 6...Logic circuit, 7, 8, 9, 2
2...VTR, 16...Video switcher, 18...Audio switcher, 17, 19...Output terminal.

Claims (1)

[Claims] 1. A demodulator that demodulates the data signal sent from the terminal, a logic circuit that processes the signal demodulated by the demodulator, and a plurality of devices connected to this logic circuit and operated by the output of the logic circuit. A video tape recorder and a plurality of video signals obtained from these video tape recorders are input signals, and the video signal of the operating video tape recorder is outputted to the output terminal by being switched by the output from the logic circuit. A plurality of audio signals obtained from the video switcher to be switched and the video tape recorder are input signals, and the audio signal of the video tape recorder in operation is outputted to the output terminal by being switched by the output from the logic circuit. and a modulator that modulates the output of the logic circuit and returns it to the terminal, and is configured to notify whether control has been performed according to the data signal sent from the terminal. Video tape recorder switching device.