JPS5850667Y2 - Video tape recorder recording signal supply device to communal viewing and viewing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a device that supplies recording signals of a video tape recorder to a plurality of television receivers using a communal viewing device.

In recent years, an increasing number of households own two or more television receivers, including video tape recorders (hereinafter abbreviated as VTRs).

)There are few households that own two or more.

Therefore, in order to view video playback images on a television receiver to which the VTR is not connected, it was necessary to move the VTR to a location 1 where the television receiver to which the VTR was to be viewed was located.

The object of this invention is to provide a video tape recorder recording signal supply device that allows video playback images to be viewed on a plurality of televisions without moving the VTR using a joint viewing device.

This invention will be explained below based on the illustrated embodiment.

In the figure, 2 is a household common vision device, 4 is a two-way splitter, the input terminal of which is connected to a common antenna (not shown) through a booster (not shown) or directly. .

Furthermore, trunk lines 6 and 8 are connected to both distribution terminals, respectively.

These main lines 6, 8 have 1 branchers 10, 12, 14, 16
are interposed, and each branch terminal has TV terminal 1.
8, 20, 22, and 24 are connected, and a television signal is supplied to each of these television terminals 18, 20, 22, and 24.

Note that 25 is a band rejection filter that blocks UHF signals.

2 splitter 4 has a coupling amount between terminals of 12 OdB, 1 brancher 10
, 12°14.16 has a branching loss of 11 OdB, a reverse coupling amount of 150 dI3, and an insertion loss of 11 dB.

23 is a two-way divider, the input terminal of which is connected to the television terminal 20 and pressed, and one terminal of which is connected to the input side of the VTR 26.

This VTR 26 receives the V input via the communal viewing and viewing device 2.
Recording HF television signals.

Reference numeral 28 denotes a two-way divider, the input terminal of which is connected to the output side of the VTR 26, and one of the distribution terminals connected to the television receiver 30.

32 is a converter that converts the HF signal into a UHF signal; its input side is connected to the other distribution terminal of the 2-way divider 28, and its output side is connected to the other distribution terminal of the divider 25. There is.

The output of this converter is configured to be approximately 110 dB.

In the supply device configured in this way, the recording signal of the VTR 26 is supplied to the television receiver 30 via the 2-way splitter 28, and at the same time, it is also supplied via the 2-way splitter 28 to the converter 32 where it is converted into a UHF signal. , are supplied to the television terminal 20 via the distributor 23.

At this time, the converter output is greatly attenuated and does not reach one of the distribution terminals.

The signal is supplied from this terminal 20 to television terminals 18, 22 and 24 via one-way splitters 12, 10, 14, and 16 and two-way splitter 4.

At this time, the loss from the TV terminal 20 to the TV terminal 18 is: Branch loss of the 1-brancher 12 (-10 dB) + Reverse coupling amount of the 1-brancher 10 (-30 dB) - -40 dB.

Also, the loss from the TV terminal 20 to the TV terminal 22 is: Branch loss of 1-brancher 12 (-10 dB) + Inter-terminal coupling amount of 2-branch 4 (-20 dB) + Branch loss of 1-branch 14 (-10 dB) - -40dB.

In this case, the insertion loss of the 1-brancher 10 is as small as -1 dB, so it is ignored.

Also, the loss from the TV terminal 20 to the TV terminal 24 is 1
Branch loss of branch 12 (-10 dB) + 2 Amount of coupling between terminals of splitter 4 (-20 dB) + 1 Branch loss of branch 16 (
-10dB)--40dB.

In this case as well, the insertion loss of the single splitters 10 and 14 is ignored.

Therefore, from the TV terminal 20 to the other TV terminal 18,
Since the losses to 22 and 24 are all -40 dB, the recording signal levels at each television terminal 18 and 22 and 24 are equal.

Therefore, since the output of the converter is sent out at approximately 110 dB, appropriate levels can be obtained at each TV terminal.
If you connect a television receiver to these, you can get good images.

Moreover, since the tweeter 25 is provided, it is possible to prevent the converter output from being radiated from the antenna.

Furthermore, since the losses from the TV terminals 1B, 22 and 24 to other TV terminals are all -4 OdB, which terminal among the TV terminals 18, 22, and 24 is connected to the converter 32?
Even if the output side of the terminal is connected, the loss to each terminal is -40d.
Since it is B, an appropriate level can be obtained.

With this supply device, as described above, by simply connecting this device to one television terminal, it is possible to supply recording signals at the same level to other television terminals.

Therefore, it is convenient to be able to watch the reproduced image of the videotape without moving the VTR at the location 1 where the television receiver to be viewed is placed.

In the above embodiment, the distributor 23 divides the television signal into V
Although the converter output 32 is sent to the TR 26 and the converter output 32 is supplied to the TV terminal, other branchers, duplexers, etc. can be used in the same way.

[Brief explanation of drawings]

The figure is a block diagram of a video tape recorder recording signal supplying device to a communal viewing and viewing device implementing this invention. 2... Joint viewing and viewing device, 6, 8... Trunk line, 10, 1
2゜14.16...1 splitter, 23...2 splitter (
coupling circuit), 25... band rejection filter, 26...
Video tape recorder, 28...2 splitter, 30...
- Television receiver, 32... converter.

Claims (1)

[Scope of utility model registration request] a joint viewing device, in which a main line transmitting television signals received by a common television antenna is provided with a plurality of branchers so as to supply said television signals to a plurality of television receivers;
A two-way divider in which the output signal of the video tape recorder is supplied to the input terminal and one distribution terminal connected to the television receiver, a converter in which the input side is connected to the other distribution terminal of the two-way divider, and a first terminal connected to one of the splitters, a second terminal connected to the input side of the video tape recorder, and a third terminal connected to the output side of the converter; a coupling circuit having a small amount of attenuation between the first and second terminals and between the first and third terminals and a large amount of attenuation between the second and third terminals; the common antenna; and the main line. A device for supplying a video tape recorder recording signal to a communal viewing device, comprising the converter output frequency band rejection filter interposed between the converter and the converter output frequency band rejection filter.