JPS6329341Y2 - - Google Patents

Description

[Detailed Description of the Invention] A system of television receivers called Peri-Television has been implemented in France. 1st
The figure is a schematic diagram, in which a signal received by a tuner 1 is supplied to a video detection circuit 3 through a VIF circuit 2, and a video signal is extracted. This video signal is supplied to one contact a of the changeover switch 4, and is also supplied to a terminal a' of the connector 5. Further, an external video signal supplied to terminal b' of connector 5 is supplied to the other contact b of switch 4. Further, an external control signal supplied to the terminal c of the connector 5 is supplied to the control terminal of the switch 4, and for example, when the control signal is at a high potential, the switch 4 is switched to the contact b side. A signal from the switch 4 is supplied to the picture tube 7 through a video output circuit 6, and a video signal from the tuner 1 or a video signal supplied from the outside to the connector 5 is supplied to the picture tube 7.
image is received.

Furthermore, part of the signal from video detection circuit 3 is SIF
The audio signal is supplied to the audio detection circuit 9 through the circuit 8, and the audio signal is supplied to one contact d of the changeover switch 10 as well as to the terminal d' of the connector 5.
Further, an external audio signal supplied to the terminal e' of the connector 5 is supplied to the other contact e of the switch 10. Further, a control signal from the terminal c of the connector 5 is supplied to the control terminal of the switch 10, and similarly to the above-described switch 4, when the control signal is at a high potential, for example, the switch 10 is switched to the contact e side. A signal from this switch 10 is supplied to a speaker 12 through an audio output circuit 11, and an audio signal from the tuner 1 or an audio signal supplied from the outside to the connector 5 is emitted from the speaker 12.

In such a television receiver, when receiving a playback signal from a video tape recorder, the playback signal is sent to an empty channel as in the past.
There is no need to convert the playback signal to an RF signal and supply it to the connector 5 terminal.
b', e', and at the same time, a high potential control signal may be supplied to the terminal c, so that the signals from the terminals b', e' can be imaged and emitted.

However, in this case, although the signals supplied to terminals b' and e' can be obtained directly from the video tape recorder, the signal supplied to terminal c must be formed separately by a switch circuit or the like. A power source and the like are also required to drive such a circuit, necessitating a complicated circuit.

In view of these points, the present invention is intended to enable a television receiver to receive signals from a video tape recorder with a simple configuration.

By the way, in the video tape recorder called SL-3000F manufactured and sold by the applicant, the camera connector is open during video signal input/output, audio signal input/output, and playback, and terminated with 10kΩ during recording. terminals, power lines, etc. are provided. The inventor of the present application paid attention to this point.

An embodiment of the present invention will be described below with reference to the drawings.

In Figure 2, the camera connector 13 of the video tape recorder consists of 14 pins, pin 1 is the video output, pin 2 is the ground, pin 3 is the video input, pin 4 is the ground, pin 8 is the ground. is the recording/playback control, pin 9 is the audio output, pin 10 is the ground, pin 11 is the audio input, pin 12 is the ground, pin 13 is the power supply, and pin 14 is the ground. Note that the other pins are not related to the present application, so their explanations will be omitted. In addition, pin 8 is connected to switch 14 and 10k which are linked to the record button (not shown) as shown in the figure.
It is grounded through a resistor 15 of Ω.

On the other hand, the input/output connector 5 of the television receiver consists of 21 pins, the 1st pin is the audio input (terminal e'), the 4th pin is the ground for the audio signal, and the 6th pin is the audio output (terminal d). '), pin 8 is switch control (terminal c), pin 17 is video signal ground, pin 18 is ground for switch control, pin 19 is video input (terminal b'), pin 20 is video output (terminal a′) respectively. Note that the other pins are not related to the present application, so their explanations will be omitted.

For these connectors 5 and 13, pin 1 of connector 13 is connected to pin 19 of connector 5, and pin 2 of connector 13 is connected to pin 1 of connector 1.
It is connected to the 17th pin of the connector 5 through the outer conductor of the signal line between the 1st pin of the connector 3 and the 19th pin of the connector 5. Also, the 3rd pin of the connector 13 is connected to the 20th pin of the connector 5 through the DC cut capacitor 21, and the 4th pin of the connector 13 is connected to the signal line between the 20th pin of the connector 5 and the 3rd pin of the connector 13. Connected to the outer conductor. Also, the 9th pin of the connector 13 is connected to the 1st pin of the connector 5 through the 10kΩ resistor 22 for attenuation.
The 11th pin of the connector 13 is connected to the 6th pin of the connector 5 through a 51 kΩ resistor 23 for attenuation. Note that connector 1
Pins 10 and 12 of connector 3 are connected to the outer conductors of the signal lines from pins 9 and 11, and pin 4 of connector 5 is connected to the outer conductors of the signal lines from pins 1 and 6. Connected.

Furthermore, pin 14 of connector 13 is connector 15
is connected to pin 18 of connector 13.
180kΩ resistor 2 between pin 13 and pin 14
A series circuit of a resistor 25 of 4, 15 kΩ and a resistor 26 of 15 kΩ is connected, and the connection point of the resistors 24 and 25 is connected to the 8th pin of the connector 13. The connection point between these resistors 25 and 26 is connected to the base of an npn type transistor 27, the emitter of this transistor 27 is connected to the 14th pin of the connector 13, and the collector is connected to a resistor 2 of 33 kΩ.
8 and is connected to the 13th pin of the connector 13. Furthermore, the collector of the transistor 27 is connected to the base of an npn type transistor 29, and the emitter of this transistor 29 is connected to the 14th pin of the connector 13, and the collector is connected to the 13th pin of the connector 13 through a 510Ω resistor 30. Connected. The collector of this transistor 29 is connected to the 8th pin of the connector 5.

Therefore, in this device, video signals and audio signals are input and output. At the same time, when the video tape recorder is in the playback mode, the connector 13
Since the No. 8 pin of the transistor 27 becomes open, the base of the transistor 27 becomes a high potential, and the transistor 27
However, the ON transistor 29 is turned OFF, and a high potential is supplied to the 8th pin of the connector 5. Also, when the video tape recorder is in recording mode, connector 1
Since the 8th pin of 3 is terminated with 10kΩ, the base of transistor 27 becomes low potential,
Transistor 27 is turned off, transistor 29 is turned on, and the No. 8 pin of connector 5 is brought to a low potential. Note that when the video tape recorder is in a stop mode other than playback mode or recording mode, the connector 13
Since the 13th pin of the connector becomes 0 potential, the 8th pin of the connector 5
No. pin is brought to a low potential.

In this way, the playback signal from the video tape recorder is received by the television receiver. According to the present invention, it is possible to form a control signal with an extremely simple configuration, and thereby the control signal inside the television receiver is received. Good image reception can be achieved by switching the switches 4 and 10. Furthermore, since switching is performed automatically during playback, operability is extremely good.

Note that in the above circuit, capacitor 21 and resistor 2
2 to 26, 28, 30, transistors 27, 29
By providing these on one board, housing them in a single case, and configuring each line between connector 5 or 13 with one cable, it is possible to connect a video tape recorder and a television receiver. You can connect between them very easily.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of an example of a television receiver.
FIG. 2 is a block diagram of an example of the present invention. 5 is an input/output connector, and 13 is a camera connector.

Claims (1)

[Scope of utility model registration request] The video signal from the tuner and the video signal from the outside can be switched and received, and the switching can be controlled by a control signal from the outside,
When a television receiver having an input connector to which these external signals are supplied receives a playback signal from a video tape recorder, the video tape is placed between the television receiver and the video tape recorder, and means for supplying a video signal from an output connector of a tape recorder to the input connector; means for detecting a recording/playback switching signal from the output connector to form a switching control signal; A television signal adapter comprising means for supplying the input connector to the input connector.