JPH07177066A - Information transmission system - Google Patents

Abstract

PURPOSE:To transmit information to a remote demanding houses. CONSTITUTION:An information transmission base 1, an inter-mediate branch point 3, and a final branch point 7 are connected by optical fiber cables (or coaxial cables) 5 and 9. A radio machine 11 is connected to the final branch point 7, and an antenna 15-1 of the radio machine 11 is provided in an already prepared gas pipe 13. Demanding houses 17-1, 17-2,... are provided with radio machines, and antennas 15-2, 15-3,... of these radio machines are provided in the gas pipe 13. Repeating transmission equipments 21 ana 27 are installed on the way of the gas pipe 13. The repeating transmission equipment 27 is used as a radio breaker 33. The radio machine 11 and demanding houses 17-1, 17-2,... communicate with each other by radio. Information transmitted from the information transmission base l is sent to the radio machine 11 through the intermediate branch point 3 and the final branch point 7 and is amplified in the gas pipe 13 by repeating transmission equipments 21 and 27 and is communicated by radio and is sent to demanding houses 17-1, 17-2,....

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information transmission system.

[0002]

2. Description of the Related Art Recently, with the development of communication technology, an information transmission system for transmitting various kinds of information such as image information and voice information from an information transmission base to each home is being implemented.

FIG. 2 is a schematic configuration diagram of such an information transmission system. In this information transmission system, an information transmission base 101, an intermediate branch point 103, a final branch point 105 and a customer 107 are connected by an optical fiber or a coaxial cable. The information transmission base 101 transmits image information, audio information, and other various information, and the transmitted various information is sent to each customer 107 via the intermediate branch point 103 and the final branch point 105.

[0004]

However, when constructing such an information transmission system, it is necessary to wire the optical fiber or the coaxial cable as described above, but the wiring work cost is from the final branch point 105 to the customer. 10
The construction cost up to 7 is calculated to be about 3/4 of the total construction cost. Therefore, in order to reduce the construction cost, it is an important issue to reduce the wiring construction cost from the final branch point 105 to the customer 107.

Therefore, the final branch point 105 and the customer 107
It is conceivable that wireless communication will be carried out in an existing pipe such as a gas pipe and an optical fiber or a coaxial cable will not be installed to reduce the cost.

However, when wireless communication is performed in an existing pipe such as a gas pipe, there is a problem that radio waves are attenuated in the pipe and information cannot be transmitted to a customer far away from the information transmission base. .

The present invention has been made in view of the above problems, and an object thereof is to provide an information transmission system capable of transmitting information to a distant customer.

[0008]

In order to achieve the above-mentioned object, the present invention is an information transmission system for performing wireless communication in a pipe and transmitting information, wherein amplification and / or amplification of radio waves is performed in the pipe. Alternatively, the information transmission system is characterized in that a relay transmission device that performs frequency conversion is provided.

[0009]

In the present invention, the relay transmission device for amplifying and / or converting the frequency of the radio wave is provided in the pipe,
It is possible to prevent the attenuation of radio waves in the pipe.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of an information transmission system according to an embodiment of the present invention. This information transmission system includes an information transmission base 1, an intermediate branch point 3, a final branch point 7, a wireless device 11, a gas pipe 13, antennas 15-1, 15-2, ...
..., consumers 17-1, 17-2, ..., relay transmission device 2
It consists of 1, 23.

The information transmission base 1 converts image information, voice information, and other information consisting of various electric signals into optical signals,
It is sent to the intermediate branch point 3 via an optical fiber cable (or coaxial cable) 5. A plurality of final branch points 7 are provided at the intermediate branch point 3 by an optical fiber cable (or a coaxial cable).
It is connected via 9. The final branch point 7 converts the optical signal into an electrical signal. A radio 11 is connected to the final branch point 7, and the antenna 15-1 of the radio 11 is connected to the existing gas pipe 1
It is provided in 3.

In the gas pipe 13, relay transmission devices 21, 27 are provided.
Is provided. Antennas 23 and 25 of the relay transmission device 21
Is installed in the gas pipe 13. The relay transmission device 21 receives the radio wave emitted from the antenna 15 at the antenna 23,
Amplification and frequency conversion are performed in the relay transmission device 21,
Radio waves are again sent from the antenna 25 into the gas pipe 13.
The relay transmission device 27 is installed in parallel with the radio wave blocking device 33. The relay transmission device 27 receives the radio wave emitted from the antenna 15 by the antenna 29, and retransmits the radio wave into the gas pipe 13 from the antenna 31. In this case, since the radio wave blocking device 33 is also used, the frequency of the radio wave transmitted from the antenna 31 can be made the same as the frequency of the radio wave received by the antenna 29.

A radio device (not shown) is also provided in each of the customers 17-1, 17-2, ...
5-2, 15-3, ... Are provided in the gas pipe 13.

19-1 and 19-2 are antennas 15-2,
15-3 is a cable that connects 15-3 to customers 17-1 and 17-2, respectively. In the gas pipe 13, wireless communication is performed between the wireless device 11 and each of the consumers 17-1, 17-2, ....

Various information transmitted from the information transmission base 1 is sent to the wireless device 11 through the intermediate branch point 3 and the final branch point 7, and the wireless device 11 and each of the consumers 17-1, 17-2, ... Wireless communication is performed between the terminals and the various information transmitted from the information transmission base 1 to each of the consumers 17-1, 17-2 ,.

In this case, by providing the relay transmission devices 21 and 27 in the middle of the gas pipe 13, the attenuation of radio waves in the gas pipe 13 can be recovered. Therefore, the gas pipe 1
The practical distance of radio communication within 3 can be extended. Moreover, if the relay transmission devices 21 and 27 are not used, it is necessary to provide a large number of final branch points 7 for the gas pipe 13. However, by installing the relay transmission devices 21 and 27, the final branch point 7 can be installed. The number can be reduced.

In the above-described embodiment, two relay transmission devices 21 and 27 are installed, but such relay transmission devices are installed at appropriate places in the gas pipe 13. In addition, although the gas pipe 13 is used in the above-described embodiment, the present invention is not limited to the gas pipe 13, and an existing gas pipe may be used.

[0018]

As described above in detail, according to the present invention, it is possible to transmit information to a distant customer.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an information transmission system according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a conventional information transmission system.

[Explanation of symbols]

1 ... Information dispatch base 3 ... Intermediate branch point 5,9 ... Optical fiber cable (or coaxial cable) 7 ... Final branch point 11 ... Wireless machine 13 ... Gas piping 15,23,25,29,31 ... … Antenna 17 …… Customer 19 …… Cable 21,27 …… Relay transmission device 33 …… Radio wave blocking device

Claims (2)

[Claims] 1. An information transmission system for performing wireless communication in a pipe to transmit information, characterized in that a relay transmission device for amplifying and / or converting a frequency of a radio wave is provided in the pipe. Transmission system. 2. The information transmission system according to claim 1, wherein the pipe is a gas pipe.