JP2590272Y2 - RF modulator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to the improvement of an RF modulator integrated with an RF switch, a booster, and the like. In particular, the range of use has been expanded by enabling multi-broadcast recording of terrestrial waves of two or more channels. Related to an RF modulator.

[0002]

2. Description of the Related Art Conventionally, a VTR (video apparatus) having a function of recording two broadcast waves, that is, a twin video apparatus has been known. In this conventional twin video device, one of the BS (satellite broadcast) waves and VHF or UHF
It is possible to record two broadcast waves simultaneously with one of the ground waves. The reason is that the TV receiver or VTR
This is because a BS tuner and a tuner for VHF or UHF are provided on the side.

[0003] In Japan, a television receiver capable of simultaneously displaying two broadcast waves of terrestrial waves such as VHF and UHF on a single screen and enjoying the two broadcast waves, a so-called picture-in receiver.・ TV receivers equipped with a picture function are commercially available. Then, the viewer receives broadcast waves of different channels on the main screen and the sub-screen, and projects the broadcast waves on both screens.

[0004] Since the picture-in-picture function is built in the television receiver, the conventional VTR can record only one of the broadcast waves, and is displayed on the screen. There has been an inconvenience that two broadcast waves of terrestrial waves such as VHF and UHF cannot be simultaneously recorded as separate images. The cause is V
The RF modulator provided in the TR has a built-in RF switch together with a booster and the like.
This is because a television reception signal for recording and an input signal to the television receiver are separated on the antenna input side of the switch.

[0005] Such a disadvantage is caused by the fact that the television receiver has an A / A
The same occurs when a V (audio / video) input terminal is provided.
VHF or UH displayed on the screen as input to
It was not possible to output two terrestrial broadcast waves such as F as separate image signals. One way to solve such a disadvantage is to add R in the RF modulator.
An RF modulator incorporating an F splitter and housed in one case has been proposed (Japanese Patent Laid-Open No. 3-179).
883). According to this RF modulator, the size can be reduced as compared with the conventional RF modulator. However, the specific configuration, that is, the structure of the case and the arrangement of the parts are not particularly disclosed.

[0006]

SUMMARY OF THE INVENTION The present invention solves such inconvenience in the conventional RF modulator,
The VTR can be simultaneously recorded / monitored by enabling the two broadcast waves such as VHF and UHF to be recorded independently of each other, and enabling the simultaneous recording / monitoring of the two broadcast waves such as VHF and UHF. A first object is to enable effective use, and a second object is to provide a practically extremely useful RF modulator by proposing a specific configuration.

[0007]

Means for Solving the Problems] The devised is formed integrally with the electronic circuit components including an RF switch, the outer shape of the case is front of each side in substantially square is formed in an elongated thin plate RF in the modulator, a rectangular outer <br/> surface of the positive surface shape <br/> formed while for 2 minutes the rectangle in the longitudinal direction of the side of the casing, provided with an antenna input terminals and RF output terminal And
Outside surface of the side corresponding to the rectangular long side of the one side,
Provided at least two output jacks tuner, the inner portion of the case, the first distribution transformers which 2 distributes the RF signal input Ri by said antenna input terminals, the first distribution transformer one divided output the tuner output terminal
Guiding Ku second distribution transformers, modulator unit, the first switch portion及 beauty said RF output terminal for opening and closing the line between the first distribution transformer in another divided output and the RF output terminal to
The RF switch to form a second switch section is incorporated to open and close the line between the modulator section, the first switch portion及 beauty second switch of the RF switch, when one is closed and the other There interlocked as an open state, which and interlocked to on-off operation of the modulator section, the other side was 2 minutes a positive face of the case in the longitudinal direction
Outside surface of the side corresponding to the short side of the rectangular shape of the outer surface of the RF output <br/> pin or al far side, the plurality of terminals including a video input terminals to be contacted with the modulator portion is provided, is and what the video input terminals has a structure which arranged farthest from said RF output terminal.

[0008]

Next, an embodiment of the RF modulator of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a functional block diagram showing one embodiment of the detailed configuration of the RF modulator of the present invention. In the figure, 1 is an RF modulator, 11 is a first distribution transformer, 12 is a second distribution transformer, 13
Is the first switch of the RF switch for opening and closing the line between the ANT-TV (antenna input terminal 1a and the television receiver 5)
And 14, a second switch of an RF switch for opening and closing the line between the MOD-TV (the modulator unit 15 and the television receiver 5 side) .
Switch unit , 15 is a modulator unit, 1a is an antenna input terminal, 1b is an RF output terminal, 1c is a first tuner output terminal, 1d is a second tuner output terminal, 1e is a connector unit, 2 is a VHF antenna, 3 is a UHF antenna, 4
Is a mixer, 5 is a television receiver, and RF (in) is its R
An F input unit, A / V (in) denotes a connection to the audio / video signal input unit, 6 denotes a first tuner unit, and 7 denotes a second tuner unit.

[0010] RF modulator of the invention shown in FIG. 1 shows only main section, each switch of the R F Switch
The switches 13 and 14 are integrally formed with a booster (not shown) or the like. In particular, the conventional RF modulator is different in that the first tuner output terminal 1c and the second tuner output terminal 1d are connected to the first distribution transformer 11 via the second distribution transformer 12. Is different. That is, the conventional RF modulator has only one tuner output terminal.

First, a common RF modulator is used .
The circuit function will be described. The antenna input terminal 1a to be connected to the混波device 4, the middle point of the first distribution transformer 11 is connected, on the output side of the first distribution transformer 11 one end, the RF switch between ANT-TV It is connected to the RF output terminal 1b via the first switch unit 13.

The RF output terminal 1b further includes an MO
Via a second switch 14 of the RF switch between D-TV, the modulator part 15 is connected. RF switch
Ji, a first switch unit 13 between ANT-TV MOD-
A second switch section 14 operate in continuous movement between TV, when one is closed Sunawa thione state, the other is opened Sunawa
It is the blood off state. Then, the first switch unit 13
It is turned on when the television receiver 5 directly monitors a television reception signal (when the antenna input terminal 1a and the RF output terminal 1b are connected), and when the television receiver 5 monitors via a VTR or displays a reproduced image on the television screen. When turned on, it is turned off.

In conjunction with this, the second switch unit 14
It is turned off when the television receiver 5 directly monitors a television reception signal, and is turned on when monitoring via a VTR or when a reproduced image is viewed on a television screen. Further, the first and second switch sections 13 and 14 are also linked with turning on / off of the power supply of the modulator section 15 in an electric circuit.

The other end on the output side of the first distribution transformer 11 is connected to a tuner output terminal as in the prior art.
Although omitted in FIG. 1, in order to amplify the antenna input, between the antenna input terminal 1a and the first distribution transformer 11 or the first distribution transformer 11
A booster (amplifier) is appropriately arranged between the second distribution transformer 12 and the conventional RF modulator.

The above is a circuit function similar to the conventional one.
As described above, in the RF modulator of the present invention, the first tuner output terminal 1c and the second tuner output terminal 1d are provided. Therefore, the input signal from the antenna input terminal 1a is transmitted to the first distribution transformer 1
1 from the second distribution transformer 12, the first tuner output terminal 1c and the second tuner output terminal 1d.
Is transmitted to.

Thus, by providing two tuner output terminals 1c and 1d to the RF modulator,
Two broadcast waves of terrestrial waves such as HF and UHF can be extracted as separate images. Therefore, VHF
When it is desired to record both broadcast waves during simultaneous reception of two terrestrial broadcast waves such as UHF and UHF, one of the first tuner units 6 is tuned to, for example, channel A and the other second tuner unit. For example, if 7 is tuned to channel B, two broadcast waves can be recorded simultaneously.

The RF modulator of the present invention shown in FIG. 1 is not particularly shown, but is provided between the antenna input terminal 1a and the first distribution transformer 11, or between the first distribution transformer 11 and the first A booster is provided between the second distribution transformer 12 and a booster is further provided between the second distribution transformer 12 and the first tuner output terminal 1c and the second tuner output terminal 1d. or provided, the first switch of the RF switch between ANT-TV
Instead of the unit 13, it is also possible to use a booster.

The booster is not necessarily limited to one location, and may be installed at a plurality of locations. As described above, two tuner output terminals 1 are connected to the RF modulator.
Just by providing c and 1d, even when an RF switch is used, an image of a desired channel can be taken out by the VTR, so that it is possible to independently record the images.

As shown in FIG. 1, the television receiver 5 has a connection portion A / A to the audio / video signal input portion.
Even in a model provided with V (in), in the conventional RF modulator, each channel (two broadcast waves)
Could not be recorded at the same time, but according to the RF modulator of the present invention, it becomes possible. Next, the specific configuration of the RF modulator of the present invention will be described.

FIG. 2 is a view showing the appearance of an embodiment of the RF modulator of the present invention, wherein (1) is a top view, (2) is a left side view, (3) is a front view, and (4). Is a right side view, and (5) is a bottom view. In the figure, 1a to 1d
Are the same parts as those in FIG. 1, 61 is a main body case, 62 is a front cover, 63 is a back cover, and 64 is a TSG
(Test signal generator) switch, 65 is a system switch, 66 is a channel selector, 67 is a printed circuit board, 68 is a connector, is a video input terminal, is an audio input terminal, is a power supply terminal for a modulator, is a ground terminal, is a Shows the booster power supply terminal.

The RF modulator of the present invention shown in FIGS. 2 (1) to 2 (5) has almost the same external appearance as the conventional one. However, FIG. 2 (1) and FIGS.
As is apparent from (5), the first and second tuners 6 and 7 corresponding to the first and second tuners 6 and 7 described with reference to FIG. Tuner output terminals 1c and 1d are provided.

The connector 68 is a terminal for connecting a video input terminal, an audio input terminal, a power supply terminal for a modulator, a ground terminal, a power supply terminal for a booster, and the like. The video input terminal is
As is clear from FIG.
It is arranged in the place. From the booster power supply terminal, as described above, between the antenna input terminal 1a and the first distribution transformer 11, between the first distribution transformer 11 and the second distribution transformer 12, or and 2 of the distribution transformer 12 and a voltage is supplied to the placed by booster between the first tuner output terminal 1c and the second tuner output terminal 1d.

The main body case 61 has a structure in which the front and back surfaces are covered by a front cover 62 and a back cover 63, but the structure of the case itself is not necessarily limited to the case of FIG. Needless to say, the structure may be any structure provided with the output terminals of the first and second tuners. The system switch 65 is a switch for switching the state of the function (system) of the RF modulator 1, and need not always be added.

In the above embodiment, the case where two tuner output terminals, that is, the first and second tuner output terminals 1c and 1d are provided has been described.
The present invention is not limited to this, and if three or more tuner output terminals are provided, it becomes possible to simultaneously record broadcast waves of three channels or more. The RF modulator of the present invention covers all these cases.

[0025]

According to the present invention, even an RF modulator using an RF switch can simultaneously record broadcast waves of two channels or more.
Regarding terrestrial waves such as VHF and UHF received on the screen, a plurality of broadcast waves can be independently recorded. In addition, necessary components are appropriately arranged on the outer side wall and inside of the RF modulator, thereby enabling wiring and the like that are unlikely to cause mutual interference, and realizing a compact wiring and the like. Further, since the configuration of the RF modulator is extremely simple, there are many excellent practical effects such as an advantage in terms of cost.

[Brief description of the drawings]

FIG. 1 is a functional block diagram showing an embodiment of a detailed configuration of an RF modulator of the present invention.

FIG. 2 is a diagram showing an appearance of an embodiment of the RF modulator of the present invention.

[Explanation of symbols]

1 RF modulator 11 for the first distribution transformer 12 and the second distribution transformer 13 R F first switch portion 14 of the switch R F second switch of the switch 15 the modulator portion 1a antenna input terminal 1b RF output terminal 1c first tuner Output terminal 1d Output terminal for second tuner 1e Connector section 61 Case 62 Front cover 68 whose front surface is substantially rectangular.

Claims (1)

(57) [Scope of request for utility model registration] 1. An RF modulator which is formed integrally with an electronic circuit component including an RF switch, and has an outer shape of a case having a substantially square front surface and a long thin plate on each side surface. An antenna input terminal (1a) and an RF output terminal (1b) are provided on an outer surface of a rectangle on one side obtained by dividing a rectangle forming the cover 62) in the vertical direction into two, and a long side of the rectangle on the one side the outer surface (one surface of the main body case 61) of the corresponding side, at least two tuners for the output terminal (1c, 1d) is provided inside (the inside of the body case portion 61) of the case, the antenna input terminal first distribution transformer (11) for 2 distributes the RF signals input from (1a), guide Ku first to the first distribution transformer (11) one division output an output terminal for the tuner (1c, 1d) 2 distribution transformer (12),
A modulator section (15), the first distribution transformer (1);
A first switch unit (13) for opening and closing a line between the other distributed output of 1) and the RF output terminal (1b);
RF switches forming the second switch unit (14) is built for opening and closing the line between the F output terminal (1b) and said modulator section (15), the first switch portion of the RF switch (13) and The second switch unit (14) is linked so that when one is closed, the other is open, and the modulator unit (1)
This is also linked to the on / off operation of 5), and the front of the case (the front cover 62) is vertically divided into two parts.
The other side corresponding to the short side of the rectangular shape of the side outer surface (one surface of the body case 61), the outer surface of the remote from the RF output terminal (1b) side, is communicated to said modulator unit (15) A plurality of terminals including a video input terminal (68), and the video input terminal (68)
An RF modulator having a structure disposed farthest from an F output terminal.