JP3997011B2 - Wall terminal for TV - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wall surface terminal for a television set attached to an outlet box for in-home wiring, and can simultaneously input a BS-IF signal and a CS-IF signal, such as a television, a home terminal, a BS tuner, a CS tuner, etc. Up to three devices can be connected simultaneously from the device.
[0002]
[Prior art]
Until now, TV wall terminals have been commercialized with one or two outlet terminals. For example, two outlet terminals have an appearance as shown in FIG. 3A, and the inside has a circuit as shown in FIG. 3B. When two terminals A 1 and B 2 in FIG. 3 (a) are attached to a wall outlet box (not shown), they are accommodated in the box, and one of these terminals A is for signal input and the other terminal. B is a signal output. That is, a signal line C such as a TV antenna line or a lead-in line can be connected to the input terminal A, and another TV wall surface terminal can be connected to the output terminal B (this output). 3 is also called a series unit). The two outlet terminals D and E in FIG. 3 (a) are arranged so as to be exposed on the wall surface when they are attached to the outlet box, and these are branched to the wiring between the terminals D and E as shown in FIG. 3 (b). It is connected to F through a distributor G, so that the signal input to terminal A is branched, distributed and output.
[0003]
In the television wall terminal, two tuners can be connected to two outlet terminals D 1 and E 2 at the same time. For example, a CATV tuner can be connected to one and a BS tuner or CS tuner can be connected to the other. When a BS tuner is connected, a CATV signal and a BS-IF signal from a BS antenna (not shown) are transmitted to the signal line C to which the input terminal A is connected, and the CS tuner is connected. In this case, a CATV signal and a CS-IF signal from a CS antenna (not shown) are transmitted to the signal line C 1.
[0004]
[Problems to be solved by the invention]
Even if the TV wall surface terminal has two outlet terminals D 1 and E 2, it is impossible to connect a BS tuner and a CS tuner to them and view them. This is because the BS-IF signal and the CS-IF signal cannot be transmitted to one coaxial cable. The CS-IF signal transmission method includes the CS-IF block converter method shown in Fig. 5 (a) and the LNB mixed method shown in Fig. 5 (b). In the former case, CS-IF is higher in frequency than BS-IF. Even if block conversion is performed on the side, only one of CS-IF (V) or CS-IF (H) can be transmitted, and the latter is either BS-IF or CS-IF (V). This is because only one of them 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 them to the tuner.
[0005]
In the conventional TV wall terminal, two TV wall terminals I and J are attached to the outlet box H as shown in FIG. 4, and one of these TV wall terminals (two-terminal type) I is connected to the CATV signal and BS- Input the IF signal, connect the CATV tuner and BS tuner to the two outlet terminals K and L, input the CS-IF signal to the other TV wall terminal (1-terminal type) J, If a CS tuner is connected to the outlet terminal M, it is possible to receive all of CATV, BS and CS at the same time. In this case, however, two TV wall terminals are required, and the outlet box also has a TV wall terminal. Since it is necessary to use a type that can attach two, there is a problem of cost increase in parts cost and work cost. In recent years, there has been an increase in the number of households watching CS broadcasts, and there has been a demand for a wall terminal for a TV that allows users to watch BS and CS without significant cost increases.
[0006]
[Means for Solving the Problems]
The TV wall surface terminal of the present invention is configured in a series unit type that can be attached to a wall outlet box, and three outlet terminals 1, 2, and 3 are arranged on the front side, and inputs are provided on both side surfaces thereof. Terminals 4 and 5 are formed, and one of the input terminals 4 and 5 is connected to two outlet terminals 1 and 2 via a distributor 6, and the other one of the input terminals 4 and 5 remains. It is characterized by being connected to.
[0007]
In the present invention, the wall surface terminal for television of claim 2 is provided with filters 7 and 8 between the distributor 6 and the outlet terminals 1 and 2 of claim 1, respectively, and one of the filters 7 is BS- The IF signal and / or CS-IF signal is blocked and the RF signal is allowed to pass, and the other filter 8 is one that blocks the RF signal and allows the BS-IF signal and / or the CS-IF signal to pass. It is characterized by this.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of a wall surface terminal for a TV according to the present invention. Outlet terminals 1, 2, 3 for connecting a tuner are provided on the front surface of a main body case 9, and terminals (input terminals) 4, 5 are provided on the side surface. Projected. The input terminal 4 on the side of the case is a terminal to which a CATV signal and a BS signal are input, and the input terminal 5 is a terminal to which a CS signal is input. These input terminals 4 and 5 are accommodated in the box when attached to the outlet box, and the outlet terminals 1, 2, and 3 are exposed to the front side of the wall surface when the outlet box is attached. The input terminals 4 and 5 stored in the outlet box are connected to the signal wires drawn out in the box and connected to the CATV signal, BS signal, and CS signal, and the outlet terminals 1, 2, and 3 are connected to the home. The tuner is connected to the connector and the CATV signal, BS signal, and CS signal are output. The outlet terminals 1, 2, and 3 are generally F-type connectors.
[0009]
As shown in FIG. 2, a distributor 6 for distributing the signal input to the input terminal 4 to the two outlet terminals 1 and 2 is provided in the main body case 9. In this case, one of the output ends of the distributor 6 is connected with an RF filter 7 that blocks the BS-IF signal and allows the RF signal to pass, and the other is blocked with the RF signal and allows the BS-IF signal to pass. A BS-IF filter 8 is connected to the outlet terminals 1 and 2, respectively.
[0010]
The RF filter 7 is a filter that passes an RF signal used for transmission of a downlink signal in CATV, that is, a signal in a frequency band of 70 to 450 MHz. For this, use a low-pass filter that allows signals below 1 GHz to pass but cuts signals above 1 GHz (BS-IF and CS-IF signals), and a band-pass filter (BPF) that passes only signals from 70 to 450 MHz. can do. When using the latter BPF, it is possible to cut the 10 to 50 MHz RF signal used for upstream signal transmission by CATV, so to prevent upstream noise from entering the transmission line from the CATV tuner on the subscriber side. convenient.
[0011]
The BS-IF filter 8 is a filter that passes a BS-IF signal in the 1 GHz band. For this, a high-pass filter that allows signals of 1 GHz or higher to pass but cuts signals lower than that can be used, or a band-pass filter that passes only signals of 1 GHz band.
[0012]
Of the two input terminals 4 and 5, the input terminal 5 is directly connected to the outlet terminal 3.
[0013]
In the above embodiment, since the main body case 9 is made large enough to be attached to an existing outlet box, the gap between the outlet terminals 1, 2, and 3 is small, but a new large outlet box is prepared as a new standard. By creating such an outlet box, the main body case 9 can be enlarged, and the interval between the outlet terminals 1, 2, 3 can be increased.
[0014]
【The invention's effect】
In the TV wall surface 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 outlet terminal 3 is left with the other of the input terminals 4 and 5. For example, a CATV RF signal and a BS BS-IF signal are input to the input terminal 4, a CATV tuner and a BS tuner are connected to the outlet terminals 1 and 2, and the CS of the input terminal 5 CS -If you input an IF signal and connect a CS tuner to the outlet terminal 3, you can watch CATV, BS, and CS.
[Brief description of the drawings]
FIG. 1 is a front view showing an appearance of a wall surface terminal for a television according to the present invention.
2 is a circuit diagram showing an internal circuit of the wall surface terminal for television shown in FIG. 1;
FIG. 3 is an example of a conventional wall terminal for a two-terminal TV, where (a) is a front view of the appearance, and (b) is an internal circuit diagram.
FIG. 4 is an explanatory diagram showing an example of a BS and CS reception method using a conventional TV wall surface terminal.
FIGS. 5A and 5B are explanatory diagrams showing a frequency map of CS / BS IF transmission. FIG.
[Explanation of symbols]
1, 2, 3 Outlet terminal 4, 5 Input terminal 6 Distributor 7, 8 Filter

Claims (2)

It is configured as a series unit type that can be attached to a wall outlet box, and three outlet terminals (1, 2, 3) are arranged on the front side, and input terminals (4, 5) are formed on both side surfaces thereof. One of the terminals (4, 5) is connected to two outlet terminals (1, 2) via a distributor (6), and the other outlet terminal (3) remains the other of the input terminals (4, 5). A wall terminal for TVs characterized by being connected to. Filters (7, 8) are respectively provided between the distributor (6) and the outlet terminals (1, 2) according to claim 1, one of the filters (7) being a BS-IF signal and / or CS The other filter (8) blocks the RF signal and allows the BS-IF signal and / or the CS-IF signal to pass. The wall surface terminal for a television set according to claim 1.

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