JPH0378031B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a television community reception system that can also transmit audio signals from television, radio, etc.

The drawings showing the embodiments of the present application will be described below. FIG. 1 is a system diagram showing an example of a television joint reception system, and numeral 1 indicates an antenna for television reception. An amplifier 2 amplifies the television signal received by the antenna 1. 3 indicates a distributor. Although the illustrated one is a two-way divider, various types such as a three-way divider, a four-way divider, etc. can be used depending on the scale of the system. Reference numeral 4 denotes a first series unit, which is used as an upper limit (in this specification, a series connection device that functions as a branch or distributor and has a television output terminal is referred to as a series unit). 5 is an input terminal, 6
7 indicates an output terminal, 7 indicates a television output terminal, and 8 indicates an audio signal terminal. For example, an F-type socket is used for the TV output terminal 7, and as shown in the figure, a TV receiver 11 is connected using a TV plug 9 and a power supply line 10.
Connected to the antenna terminal of The audio signal terminal 8 is for injecting audio signals into the television community reception system or extracting audio signals from the system, and a commercially available jack (JM25 type, etc.) is used. The figure shows a connection state when audio is injected from the television receiver 11 to the system. 12 is an earphone jack in the television receiver 11. 13 is a connection line and a VFF code is used. 14 indicates a plug (2.5P socket). 15a, 15b, 15c, . . . are second series units used as intermediate terminals, and have input terminals 16a, 16b, . . . and output terminals 17a, .
17b,..., TV output terminals 18a, 18b,
..., audio signal terminals 19a, 19b, . Each of the television output terminals 18a, 18b, . . . uses, for example, an F-type socket, and a television receiver can be connected thereto as is well known. In addition, each audio signal terminal 19
A, 19b, . . . are for extracting audio signals from the television community reception system or injecting audio signals into the system, and commercially available jacks (JM25 type, etc.) are used. 20a, 20b, 2
0c indicates an earphone, and 21a, 21b, and 21c indicate patients at a hospital or the like. 22 is a television receiver,
TV output terminal 18 of second direct unit 15c
c using a television plug 23 and a power supply line 24. Next, 25 is a third series unit, which is used as a lower limit. In most cases, the lower limit is chosen at the system terminals, but by choosing the circuit configuration of the series units appropriately, it is also possible to place it somewhere in the middle of the system. In the third series unit 25, 26 is an input terminal, 27 is a TV output terminal to which a TV receiver can be connected, and 28 is used to extract audio signals from the TV community reception system or inject audio signals into the system. This is an audio signal terminal for. 20z are earphones,
21z indicates the patient. Reference numeral 29 denotes a transmission line connecting the switching devices, and a coaxial cable is used, for example.

The operation of the system with the above configuration will be explained. The television signal of the television broadcast wave received by the antenna 1 passes through the amplifier 2 and the distributor 3 to the first series unit 4, the second series unit 15a, 15b,
15c, . . . and reaches the third series unit 25. In the first series unit 4, the television signal is branched and sent from the television output terminal 7 to the television receiver 11. The television receiver 11 is set to one channel that broadcasts programs that many patients like, and the television receiver 11 is set to broadcast only images.
The sound coming from the speakers is throttled. On the other hand, from the earphone jack 12 of the television receiver 11, an audio signal (low frequency signal) of the one channel is transmitted.
is sent out and injected into the television community reception system from the audio signal terminal 8 of the first series unit 4. This audio signal is not sent from the first series unit 4, which is used as the upper limit series unit, to the system at the previous stage, but to the side at the latter stage. Therefore, the earphones 20a, 20b are connected to the respective audio signal terminals 19a, 19b of the second series units 15a, 15b used as intermediate series units.
The patients 21a and 21b who have inserted the TV receiver 11 can enjoy the images on the television receiver 11 while also enjoying the sounds that match the images without bothering each other with noise. Third series unit 25 used as a lower limit series unit
The same goes for the patient 21z who is listening to the audio by inserting the earphone 20z into the audio signal terminal 28. On the other hand, the patient 21c has his own television receiver 22.
It is possible to listen to the broadcast of a channel other than the one channel described above without disturbing other patients 21a, 21b, . . . with noise. In other words, the second unit is used as an intermediate series unit.
TV output terminal 1 in the series unit 15c of
The TV signal branched to 8c is sent to the TV receiver 22.
and a channel other than one channel is selected on the television receiver 22. Since the earphone 20c is used to transmit the sound of the broadcast on this other channel, there is no need to leak the sound of the TV, which can become noise, to other patients.

In this way, in places such as hospitals and nursing homes where large numbers of people gather and stay for long periods of time, each person can watch their favorite TV broadcasts without bothering each other, even if only a few television receivers are used.

In the above example, the audio signal was injected from the series unit for the upper limit, but for the middle or lower limit, etc.
It goes without saying that the audio signal can be injected from the audio signal terminal of any series unit.

Furthermore, although the above example shows the injection of audio from a television receiver, it is also possible to inject audio signals obtained from radio or other audio broadcasts.

Next, FIGS. 2 to 4 are circuit diagrams showing examples of each series unit in FIG. 1. FIG. 2 is the first series unit, FIG. 3 is the second series unit, and FIG. The circuit diagram of the 3rd series unit is shown, and the same parts as in FIG.
etc.).)

In FIG. 2, 30 is a well-known branch circuit used for television signals. 31 is the input end, 32
indicates an output end, and 33 indicates a branch end. 34 is a coil for blocking high frequency signals such as television signals and passing low frequency signals such as audio signals. 35 is a capacitor for blocking low frequency signals such as audio signals and passing high frequency signals such as television signals. A resistor 36 is provided as necessary for impedance matching with an earphone or the like connected to the audio signal terminal 8. A capacitor 37 is used to prevent leakage current from flowing from the television receiver connected to the television output terminal 7.

Next, in FIG. 3, 38 is a well-known television signal branch circuit, 39 is an input terminal, 40 is an output terminal, 4
1 is a branch end. Note that as the branch circuit 38, one in which the audio signal is less attenuated between the input end 39 and the output end 40 is used. 42 is a coil, 43 is a capacitor, and 44 is a resistor, each of which functions similarly to the coil 34, capacitor 35, and resistor 36 in the previous figure. 45 is a capacitor, which functions in the same way as the capacitor 37 in the previous figure.

Next, in FIG. 4, 46 is a coil, 47 is a capacitor, and 48 is a resistor, which function similarly to the coil 34, capacitor 35, and resistor 36 in FIG. 2, respectively. 49, 50, 51 are π well known in resistance
It constitutes a type attenuation circuit. 52 is a capacitor, which functions similarly to the capacitor 37 in FIG.

In the above explanation, an example was shown in which the first series unit was used for the upper limit, the second series unit was used for the middle, and the third series unit was used for the lower limit. It is also possible to omit the first series unit and use the second series unit at the forefront for the upper limit, or omit the third series unit and use the second series unit at the last stage for the lower limit. It is.

Next, FIG. 5 shows a circuit diagram of a volume adjuster used in the television community reception system of FIG. 1. In the figure, reference numeral 53 denotes a volume adjuster, which is used to adjust the audio signals flowing to the earphones 20a, 20b, . 54 is a plug at the input end (2.5P access)
etc. are used and connected to the audio signal terminal of the series unit. 55 is an audio signal terminal for connecting earphones. 56 indicates a variable resistor.

As described above, the present invention has the advantage that it is possible to provide one or more areas in which audio signals can be transmitted and received between arbitrary stages in the television community reception system.

Furthermore, there is an effect that the audio signal can be injected from one serial unit within the area where the audio signal can be transmitted and received, and the audio signal can be extracted from the other serial units within the area using earphones.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is a system diagram showing an example of a television community reception system, and FIG.
The figure is a circuit diagram showing an example of the first series unit, FIG. 3 is a circuit diagram showing an example of the second series unit,
FIG. 4 is a circuit diagram showing an example of a third series unit, and FIG. 5 is a circuit diagram showing an example of a volume adjuster used in a television community reception system. 4...First series unit, 11...Television receiver, 15a, 15b, 15c...Second series unit, 25...Third series unit, 8, 19
a, 19b, 19c, 28...Audio signal terminals.

Claims (1)

[Claims] 1. In a television community reception system, an upper limit series unit and a lower limit series unit are provided between arbitrary stages, and the upper limit series unit and lower limit series unit have a TV output terminal to which a television receiver is connected. In addition, an audio signal terminal to which an earphone or the like is connected is also provided, and an audio signal is injected into the system from the audio signal terminal, or an audio signal in the system is extracted from the audio signal terminal,
Moreover, in the television joint reception system, the audio signal is transmitted within an area sandwiched between the upper limit series unit and the lower limit series unit.