JP2000134504A - Wall face terminal for television - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a wall face terminal for a television for allowing a viewer to view BS and CS without sharply increasing costs in order to cope with the increase of the viewing households of CS broadcasting. SOLUTION: This wall face terminal for a television is constituted in a serial unit type so as to be mounted to the outlet box of the wall face, and three outlet terminals 1, 2, and 3 are arranged on the surface, and input terminals 4 and 5 are formed on the both side faces. Then, one of those input terminals 4 and 5 is connected through a distributor 6 to the two outlet terminals 1 and 2, and the other input terminal 4 or 5 is connected to one remaining outlet terminal 3. Also, filters are provided between the distributor and the outlet terminals 1 and 2 so that an RF signal can be transmitted through one filter while any BS/IF signal and/or CS/IF signal can be prevented from being transmitted by the filter, and that the BS/IF signal and/or CS/IF signal can be transmitted through the other filter while any RF signal can be prevented from being transmitted by this filter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wall terminal for a television mounted on an outlet box for in-home wiring, which can simultaneously input a BS-IF signal and a CS-IF signal. Up to three devices such as BS tuners and CS tuners can be connected at the same time.

[0002]

2. Description of the Related Art Up to now, TV wall terminals having one or two outlet terminals have been commercialized.
For example, the one having two outlet terminals has an appearance as shown in FIG. 3A, and the inside has a circuit as shown in FIG. 3B. The two terminals A and B in FIG.
When mounted on an outlet box (not shown) on the wall, it is housed and arranged in the box. One terminal A is for signal input, and the other terminal B is for signal output. That is, a signal line C such as a TV antenna line or a drop-in line can be connected to the input terminal A, and another television wall terminal can be connected to the output terminal B (this output terminal B). FIG. 3
TV terminal is also called a series unit). When the two outlet terminals D and E in FIG. 3A are mounted on the outlet box, they are exposed and arranged on the wall surface. These are connected to the wiring between the terminals D and E as shown in FIG. F and distributor G
The signal input to terminal A is branched, distributed, and output.

In the television wall terminal, two tuners can be connected to two outlet terminals D and E at the same time. For example, a CATV tuner is connected to one terminal and a BS tuner or CS tuner is connected to the other. Can be. When a BS tuner is connected, a signal for CATV and a BS-IF signal from a BS antenna (not shown) are transmitted to a signal line C to which an input terminal A is connected, and a CS tuner is connected. In this case, a signal for CATV and a CS-IF signal from a CS antenna (not shown) are transmitted to the signal line C.

[0004]

The above-mentioned television wall terminal has two outlet terminals D and E, but the two terminals are BS.
It was not possible to connect the tuner and the CS tuner and watch them. This is because the BS-IF signal and the CS-IF signal cannot be transmitted over one coaxial cable. CS-IF
The signal transmission method includes a CS-IF block converter method shown in FIG. 5A and an LNB mixing method shown in FIG. 5B. In the former, the CS-IF is blocked on the higher frequency side than the BS-IF. Even if converted, CS-IF (V)-and CS-IF (H)-
Can transmit only one of them, and the latter can be transmitted with BS-IF
This is because only one of CS-IF (V) can be transmitted. That is, the conventional TV wall terminal having only one input terminal cannot input the BS-IF signal and the CS-IF signal and output the same to the tuner.

[0005] As shown in Fig. 4, two TV wall terminals are connected to the outlet box H in the conventional TV wall terminal.
I and J are attached, and one of the TV wall terminals (2
Input a CATV signal and a BS-IF signal to I, connect a CATV tuner and a BS tuner to the two outlet terminals K and L, and connect the other TV wall terminal (one terminal type) J Input the CS-IF signal to the
If a CS tuner is connected to M, it is possible to receive all of CATV, BS, and CS simultaneously, but in this case, two TV wall terminals are required, and the outlet box also has two TV wall terminals. Since it is necessary to use a type that can be attached, there is a problem in that the cost of parts and work is increased. In recent years, as the number of households viewing CS broadcasts has increased, there has been a demand for a TV wall terminal capable of viewing BS and CS without a significant increase in cost.

[0006]

According to the present invention, the television wall terminal according to the first aspect of the present invention is configured as a series unit type which can be attached to an outlet box on the wall, and has three outlet terminals 1, 2, 3 on the front side. Input terminals 4 and 5 are formed on both side surfaces thereof, and one of the input terminals 4 and 5 is connected to two outlet terminals 1 and 2 via a distributor 6.
2 and the other of the input terminals 4 and 5 is connected to the remaining one outlet terminal 3.

According to the second aspect of the present invention, the television wall terminal according to the second aspect is the distributor 6 and the outlet terminal 1 according to the first aspect.
2 are respectively provided with filters 7 and 8, one of which filters the BS-IF signal and / or the CS-IF signal to pass the RF signal, and the other filter 7 Block the RF signal and block the BS-IF signal and / or CS-IF
It is characterized by passing a signal.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a television wall terminal according to the present invention. Outlet terminals 1, 2, 3 for connecting a tuner are provided on the front of a main body case 9;
Terminals (input terminals) 4 and 5 protrude from the side. The input terminal 4 on the side of the case is a terminal to which a signal for CATV and a signal for BS are input, and the input terminal 5 is a terminal to which a signal for CS is input. These input terminals 4 and 5 are accommodated in the outlet box when attached to the box, and the outlet terminals 1, 2 and 3 are exposed to the wall surface side when the outlet box is attached. Input lines 4 and 5 stored in the outlet box are connected to signal lines drawn out of the box by connectors, and are used for CATV signals, BS signals, and CS signals.
A signal is input, and a tuner in the home is connected to the outlet terminals 1, 2, and 3 via a connector.
A signal is output. Outlet terminals 1, 2, 3
Generally, an F-type connector is used.

[0009] As shown in FIG.
Connects the signal input to input terminal 4 to two outlet terminals
There is provided a distributor 6 for distributing the signals to 1 and 2 and outputting the divided signals.
In this case, an RF filter 7 for blocking the BS-IF signal and passing the RF signal is connected to one of the output terminals of the distributor 6,
On the other hand, the BS-I which blocks the RF signal and passes the BS-IF signal
F filters 8 are connected to outlet terminals 1
, 2 connected.

The RF filter 7 is a filter that passes an RF signal used for transmitting a downstream signal in CATV, that is, a signal in a frequency band of 70 to 450 MHz. This allows signals below 1 GHz to pass, but signals above 1 GHz (BS-IF signals and
CS-IF signal) is a low-pass filter to cut, 70-45
Bandpass filter (BPF) that passes only 0MHz signal
Can be used. If you use the latter BPF
Since the 10 to 50 MHz RF signal used for transmitting the upstream signal in CATV can be cut, it is convenient to prevent the upstream noise from entering the transmission line from the CATV tuner on the subscriber side.

[0011] The BS-IF filter 8 is a BS-IF
-A filter that passes IF signals. For this purpose, it is possible to use a high-pass filter that passes a signal of 1 GHz or more but cuts a signal of less than 1 GHz, or a band-pass filter that passes only a signal of 1 GHz band.

Of the two input terminals 4 and 5, the input terminal 5
Is directly connected to the outlet terminal 3.

In the above embodiment, since the main body case 9 is made large enough to be attached to the existing outlet box, the space between the outlet terminals 1, 2, and 3 is small.
By preparing a new large outlet box as a new standard and creating such an outlet box, the body case 9 can be made larger and the interval between the outlet terminals 1, 2, and 3 can be increased. .

[0014]

According to the TV wall terminal of the present invention, one of the input terminals 4 and 5 is connected to the two outlet terminals 1 and 2 via the distributor 6, and the other of the input terminals 4 and 5 remains. Since it is connected to one outlet terminal 3, for example, input a CATV RF signal and a BS BS-IF signal to an input terminal 4, connect a CATV tuner and a BS tuner to outlet terminals 1 and 2, and input Input CS-IF signal of terminal 5 CS and connect a CS tuner to outlet terminal 3.
You can watch ATV, BS and CS.

[Brief description of the drawings]

FIG. 1 is a front view showing the appearance of a television wall terminal according to the present invention.

FIG. 2 is a circuit diagram showing an internal circuit of the television wall terminal of FIG. 1;

3A and 3B are examples of a conventional two-terminal TV wall terminal, in which FIG. 3A is a front view of an external appearance, and FIG. 3B is an internal circuit diagram.

FIG. 4 is an explanatory diagram showing an example of a conventional method of receiving BS and CS using a television wall terminal.

FIGS. 5A and 5B are explanatory diagrams showing a frequency map of IF transmission of CS / BS.

[Explanation of symbols]

 1, 2, 3 Outlet terminal 4, 5 Input terminal 6 Distributor 7, 8 Filter

Claims (2)

[Claims] 1. A series unit type which can be attached to an outlet box on a wall, three outlet terminals (1, 2, 3) are arranged on the front side, and input terminals (4, 5) are arranged on both side surfaces thereof. Formed the input terminals (4,5)
One of which is connected to two outlet terminals (1, 2) via a distributor (6), and the input terminals (4, 5)
A wall terminal for a television, the other of which is connected to the other outlet terminal (3). 2. A filter (7, 8) between a distributor (6) and an outlet terminal (1, 2) according to claim 1.
And one of the filters (7) is BS-IF
The other filter (8) blocks the signal and / or the CS-IF signal and passes the RF signal, and the other filter (8) blocks the RF signal and passes the BS-IF signal and / or the CS-IF signal. The wall terminal for a television according to claim 1, wherein: