JP2001292335A - Data transmission system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain connection to the Internet with a small transmission loss without the need for new cable laying work. SOLUTION: A converter 22 provided to a head side of a 2-way community reception system 2 converts a 1st outgoing data signal sent wirelessly from a base station 16 into a 2nd outgoing data signal with a frequency that can be sent by the 2-way community reception system 2 and provides an output of the converted signal to the head side of the 2-way community reception system 2. A transmission reception unit 38 provided to a terminal side of the 2-way community reception system 2 converts the 2nd outgoing data signal into a 3rd outgoing data signal that is able to be processed by a personal computer 13 and provides an output of the converted signal to the personal computer 13. The transmission reception unit 38 converts a 1st incoming data signal from the personal computer 13 into a 2nd incoming data signal with a frequency that can be sent by the 2-way community reception system 2 and provides an output of the converted signal to the terminal side of the 2-way community reception system 2. The converter 22 converts the 2nd incoming data signal sent by the 2-way community reception system 2 into a 3rd incoming data signal with a frequency that is transmitted to be wirelessly sent to the base station and transmits the converted signal to the base station 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission system for connecting an information terminal device to, for example, the Internet, and more particularly to a system using a two-way joint reception system.

[0002]

2. Description of the Related Art In recent years, personal computers have become widespread. The most noticeable use of personal computers is to connect to the Internet using personal computers as information terminal devices. In many cases, a personal computer is connected to the Internet by using a modem or ISDN provided in the personal computer.

[0003] However, in the case of buildings and condominiums, transmission cables must be laid from the installation location of a telephone modular jack or the installation site of a terminal adapter for ISDN to the installation site of a personal computer. Laying work is required every time a new building is added. The use of in-plant wireless or wireless LAN is conceivable, but in order to connect to personal computers located in different rooms indoors, basically work is required to install cables and multiple access points. Become. Further, since the frequency band used in the private radio and the wireless LAN is the GHz band, the transmission loss is large.

[0004]

Incidentally, in buildings such as buildings and condominiums, a two-way joint reception system that is completed only within the building may be already installed. In this case, if the headend does not have a provider function, it cannot be used as the CATV Internet, but cables for television reception are already laid in various rooms.

According to the present invention, there is provided a data transmission system which can connect to the Internet by using such a two-way joint reception system without the necessity of laying a new cable on a large scale and having a small transmission loss. An object of the present invention is to provide a transmitting / receiving converter and a transmitting / receiving unit used in a system.

[0006]

A data transmission system according to the present invention transmits at least a television broadcast signal as a downlink signal to a plurality of terminals from a head, and transmits an uplink signal from each terminal to the head. Use a joint receiver system. This system has no provider function on the head side. A first down converter is provided on the head side of the two-way joint receiving system. The down-conversion means converts the first down-data signal wirelessly transmitted from the base station to a second down-data signal having a frequency that can be transmitted in the two-way joint reception system, and transmits the second down-data signal to the head of the two-way joint reception system. Output.
The base station is connected to, for example, a provider via a transmission path. The base station may frequency-convert the downlink information signal transmitted from the provider to a first downlink data signal, or may transmit the first downlink data signal as it is from the provider and transmit it as it is. The second down conversion means is provided on the terminal side of the two-way joint receiving system. The second downlink conversion means converts the second downlink data signal into a third downlink data signal that can be processed by the information terminal device, and outputs the third downlink data signal to the information terminal device. A first uplink converter is provided on the terminal side. The first uplink converter converts the first uplink data signal input from the information terminal device into a second uplink data signal of a frequency that can be transmitted by the two-way joint reception system, and converts the first uplink data signal into a terminal of the two-way joint reception system. Output to A second upstream converter is provided on the head side of the bidirectional joint receiving system. The second uplink converter converts the second uplink data signal into a third uplink data signal of a frequency that can be transmitted to the base station by radio, and transmits the third uplink data signal to the base station. The first downlink data is the third downlink data.
The uplink data signal may have the same frequency band.

In this data transmission system, uplink and downlink data signals are transmitted by radio between the base station and the two-way joint reception system, but are transmitted from the head of the two-way joint reception system to each terminal. The transmission is performed using a two-way joint receiving system. Since the existing two-way joint receiving system is used, it is not necessary to newly lay cables to each terminal, and it is possible to easily cope with an increase in information terminal equipment to be used. Further, since wireless transmission is performed only between the base station and the two-way joint receiving system, transmission loss is reduced as compared with the case where wireless transmission is performed entirely.

[0008] The first down conversion means and the second up conversion means may each have frequency conversion means.
In this case, a local oscillation signal is supplied to these frequency conversion means from a common local oscillator. The second downlink data signal output from the first downlink converter and the second uplink data signal supplied to the second uplink converter are of the same frequency band.

With this configuration, the first down converter and the second up converter provided together on the head side can be simplified in configuration, and the equipment cost can be reduced.

The second down conversion means and the first up conversion means may each have a frequency conversion means. In this case, a local oscillation signal is supplied to these frequency conversion means from a common local oscillator. The third downlink data signal output from the second downlink converter and the first uplink data signal supplied to the first uplink converter are of the same frequency band.

[0011] With this configuration, the configuration of the first up-conversion unit and the second down-conversion unit provided on each terminal side can be simplified, and the equipment cost can be reduced. In particular, since the first up-conversion means and the second down-conversion means are provided in each terminal, the significance of reducing equipment costs is significant.

[0012] The second downlink conversion means is connected to the terminal and converts the second downlink data signal into a fourth downlink data signal that can be transmitted wirelessly, and is connected to the information terminal equipment. And fourth down conversion means for converting the fourth down data signal into the third down data signal. In this case, the first uplink converter is connected to the information terminal device, and converts the first downlink data signal from the information terminal device into a fourth uplink data signal that can be transmitted wirelessly, and transmits the third uplink data signal. Uplink conversion means, and fourth uplink conversion means connected to the terminal and receiving the fourth uplink data signal and converting it to a second uplink data signal.

With this configuration, each terminal and the information terminal device can be wirelessly connected. Since the distance between each terminal and the information terminal device is relatively short, the transmission loss is not so large, but rather, the advantage that the cable connecting each terminal and the information terminal device becomes unnecessary is very large.

The transmission / reception converter according to the present invention is provided, for example, outside a building provided with the two-way joint reception system, and has a down conversion means. This downlink conversion means converts the first downlink signal wirelessly transmitted from the base station to:
The signal is converted into a second downlink signal having a frequency that can be transmitted in the two-way joint reception system and transmitted to the two-way joint reception system. Furthermore, it also has an up conversion means. Uplink conversion means is capable of wirelessly transmitting a first uplink signal transmitted from a terminal thereof via the bidirectional joint reception system to the base station, and converts the first uplink signal into a second uplink signal having a frequency different from that of the first downlink signal. To the base station. It is desirable that these up and down conversion means be accommodated in one housing.

By installing the transmission / reception converter, an information terminal device can be connected to the Internet using the existing two-way joint reception system.

The down converter and the up converter may each have a frequency converter. In this case, a local oscillation signal is supplied to these frequency conversion means from a common local oscillator. A second downstream signal output from the downstream converter and a second downstream signal supplied to the upstream converter.
Uplink signals are of the same frequency band.

The transmitting / receiving unit according to the present invention is arranged at a terminal of the two-way joint receiving system. This unit is
A down-conversion unit that converts the first down-link signal wirelessly transmitted from the base station on the head side of the two-way joint reception system and transmits the first down-signal to each terminal of the two-way joint reception system The second downlink signal of a frequency that can be transmitted by the two-way joint reception system is converted into a third downlink signal that can be processed by the information terminal device. Furthermore, it also has an up conversion means. The upstream conversion means transmits a first upstream signal from an information terminal device to a head side from a terminal of the two-way joint reception system, and transmits a second uplink signal having a frequency band that can be transmitted by the two-way joint reception system. The signal is frequency-converted and output to the terminal of the two-way joint receiving system. It is preferable that the up-conversion and down-conversion means are also housed in one housing.

In such a configuration, a device that converts a downstream signal transmitted to the information terminal device through the bidirectional joint reception system into a signal that can be processed by the information terminal device, or a device that converts an upstream signal from the information terminal device into a bidirectional signal. There is no need to provide a device that converts the signal into a signal that can be transmitted by the joint receiving system. Therefore,
Generally used information terminal equipment can be used as it is.

The transmitting / receiving unit according to the present invention has first transmitting means provided in the terminal. The first transmitting means is
The first downlink signal wirelessly transmitted from the base station is converted on the head side of the two-way joint reception system and transmitted to each terminal of the two-way joint reception system. The second downlink signal is converted into a third downlink signal that can be transmitted wirelessly and transmitted. Further, the transmission / reception unit also has first receiving means connected to the information terminal device. The first receiving means receives the third downlink signal, converts it into a fourth downlink signal that can be processed by the information terminal device, and outputs the fourth downlink signal to the information terminal device. This transmission / reception unit also has a second transmission means connected to the information device. The second transmitting unit converts the first uplink signal from the information terminal device into a second uplink signal in a frequency band that can be wirelessly transmitted, and transmits the second uplink signal. Further, the transmitting / receiving unit also has a second receiving means provided in the terminal. The second receiving means receives the second uplink signal, converts the signal into a third uplink signal having a frequency that can be transmitted in the two-way joint reception system,
Supply to the terminal of the two-way joint receiving system.

With this configuration, signals can be transmitted and received between the terminal and the information terminal device wirelessly, so that there is no need to lay cables.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A data transmission system according to a first embodiment of the present invention has a two-way joint reception system 2 as shown in FIG. This two-way joint receiving system 2
Is, for example, a building joint receiving system, and includes a satellite broadcast signal, a satellite communication signal, or a satellite signal composed of both, received by a BS (CS) antenna 4 installed on the rooftop of a building, and a terrestrial television. Each signal obtained by mixing and amplifying a terrestrial television broadcast signal composed of UHF, VHF or both television broadcast signals received by the television broadcast receiving antenna 6 by the booster with mixer 8 is provided in each room in the building. To the television terminal 10.

The two-way joint receiving system 2 includes a two-way distributor 12, a two-way serial unit 14, and the like. Although not shown, a bidirectional trunk amplifier, a bidirectional branch amplifier, a bidirectional distribution amplifier, and the like are also used.

In a state where such a two-way joint reception system 2 is provided, information terminal equipment provided in each room of the building, for example, a personal computer 13
Is connected to the Internet, the base station 1 is placed in a location with a good view, such as the top of a telephone pole 14 near this building.
6 is installed. The base station 16 is connected by an optical fiber cable or a coaxial cable to a provider's server (not shown) installed at a location remote from the base station 16 and transmits a downstream data signal from the server to, for example, 5.3 GHz or 2 GHz. Is converted into a first downlink data signal (first downlink signal) using a part of a channel having a frequency bandwidth of, for example, 80 to 100 MHz.
The signal is transmitted from the antenna 18.

An antenna 20 is installed on the roof of a building where the two-way joint receiving system 2 is installed so as to be able to receive the first downlink data signal transmitted from the antenna 18. The first downlink signal received by the antenna 20 is supplied to the converter 22.

The converter 22 is a small one provided in one housing, and has an input / output terminal 23 as shown in FIG. Is supplied. This first downlink data signal is supplied to first downlink conversion means, for example, a downlink mixer 26, via the distribution / synthesizer 24. The local mixer 28 is supplied with a local oscillation signal from a local oscillator 28. The oscillation frequency of the local oscillation signal is such that the first downlink data signal can be transmitted in the two-way joint reception system 2 in an available frequency band, for example, 250 MHz.
Super high band such as z to 350 MHz or 6
The frequency is selected as a frequency that can be frequency-converted to a second downlink data signal (second downlink signal) such as a partially vacant channel (depending on region) in the UHF band of 70 MHz to 770 MHz.

The second downstream data signal from the downstream mixer 26 is transmitted to the input / output terminal 32 via the transmission / reception switch 30.
Supplied to From this input / output terminal 32, it is supplied to the mixer 34 shown in FIG. In the mixer 34, the second downstream data signal and the output signal of the booster with mixer 8 are mixed and supplied to the head side of the bidirectional joint receiving system 2.

The mixed output (mixed signal of the second downlink data signal, the terrestrial television broadcast signal, and the satellite signal) of the mixer 34 is transmitted through the two-way joint receiving system 2 to be used in various parts of the building. It is transmitted to each television terminal 10 in a room. At this time, since the second downlink data signal has been down-converted to a lower frequency that can be transmitted in the two-way joint reception system 2, there is no large attenuation due to transmission in the two-way joint reception system 2. Further, when the two-way joint receiving system 2 already exists, it is not necessary to newly lay cables in each room in the building.

The mixed output from the mixer 34 supplied to the television terminal 10 is converted into a second downlink data signal, a terrestrial television broadcast signal and a satellite signal by a demultiplexer 36 provided in each room. The terrestrial television broadcast signal and the satellite signal are supplied to a television receiver (not shown) and viewed by a viewer.

On the other hand, the second downlink data signal is supplied to the transmission / reception unit 38. The transmitting / receiving unit 38 is a small one provided in one housing, and as shown in FIG.
The transmission / reception unit 38 has an input / output terminal 40 to which a second downstream data signal is supplied from the duplexer 36. Second
The downstream data signal is supplied to a second downstream conversion unit, for example, a downstream mixer 44 via the distribution / combiner 42. The local mixer 46 is supplied with a local oscillation signal from a local oscillator 46. This local oscillation signal has a frequency necessary for frequency-converting the second downlink data signal into a third downlink data signal (third downlink signal) in a frequency band that can be processed by the personal computer 13. This third downlink data signal is supplied to the input / output terminal 50 via the transmission / reception switch 48, and the personal computer 13
Is output to Therefore, the personal computer 13 can view, for example, the Web based on the third downlink data signal.

A first upstream data signal (first upstream signal) outputted from the personal computer 13 [this is in the same frequency band as the third downstream data signal. ] Is supplied from the input / output terminal 50 of the transmission / reception unit 38 to the first upstream conversion means, for example, the upstream mixer 52, via the transmission / reception switch 48. This up mixer 5
2 is supplied with the same local oscillation signal as that supplied from the local oscillator 46 to the downstream mixer 44. Therefore,
The first uplink data signal is, like the second downlink data signal,
The frequency is converted to a super high band such as 250 MHz to 350 MHz or a partially vacant channel in the UHF band of 670 MHz to 770 MHz. in this way,
The first uplink data signal is also up-converted into a second uplink data signal (second uplink signal) in a frequency band that can be transmitted by the existing two-way joint reception system 2 and transmitted using the two-way joint reception system 2. Therefore, the second uplink data signal is not greatly attenuated by the transmission in the two-way joint reception system 2. Further, when the two-way joint receiving system 2 is existing, it is not necessary to newly lay cables in each room in the building. The second upstream data signal is transmitted to the head side of the two-way joint receiving system 2 via the distributor / synthesizer 42 and the input / output terminal 40, and is supplied to the converter 22 via the mixer 34 shown in FIG.

In the converter 22, the second upstream data signal is supplied from the input / output terminal 32 of the converter 22 to the second upstream conversion means, for example, the upstream mixer 54 via the transmission / reception switch 30. The same local oscillation signal as that supplied to the down mixer 26 is supplied from the local oscillator 28 to the up mixer 54. This allows the second
The uplink data signal is frequency-converted into a third uplink data signal (third uplink signal) in the same frequency band as the first downlink data signal, for example, 5.3 GHz or 2.4 GHz. Third
The upstream data signal is amplified by the amplifier 56,
The antenna 2 is connected via the distributor / synthesizer 24 and the input / output terminal 23
0 and transmitted from the antenna 20. The third uplink data signal is received by the antenna 18, demodulated into an uplink signal by the base station 16, and transmitted to the provider via an optical fiber or a coaxial cable. Therefore, the command by the upstream data signal from the personal computer 13 is transmitted from the provider to the predetermined server.

FIG. 4 and FIG. 5 show a second embodiment. In the second embodiment, a transmitting / receiving unit connected to the television terminal 10 of the two-way joint receiving system 2 is different.
Otherwise, the configuration is the same as that of the first embodiment, and a detailed description thereof will be omitted.

In the first embodiment, the television terminal 10
The personal computer 13 and the personal computer 13 are connected by a wire via one transmitting / receiving unit 38. In the second embodiment, the transmitting / receiving units 60 and 62 are connected to the television terminal 10 and the personal computer 13, respectively.
Wireless communication is performed between the transmission / reception units 60 and 62.

That is, the second downlink data signal transmitted from the two-way joint reception system 2 to the television terminal 10 is:
The input / output terminal 64 of the transmission / reception unit 60 shown in FIG.
To a third down-conversion unit, for example, a down-mixer 68, via a distributor / synthesizer 66. The local mixer 70 is supplied with a local oscillation signal from the local oscillator 70 and frequency-converts the second downstream data signal into a fourth downstream data signal (fourth downstream signal). The fourth downlink data signal is, for example, a signal in a high-frequency band that can be transmitted from an antenna 78 described later, amplified by the amplifier 72, supplied to the input / output terminal 76 via the transmission / reception switch 74, and further transmitted to the antenna shown in FIG. It is transmitted from 78 to the transmitting / receiving unit 62.

In the transmitting / receiving unit 62, the fourth downlink data signal received by the antenna 80 is supplied to the input / output terminal 82 shown in FIG. The fourth downstream data signal is supplied from an input / output terminal 82 to a fourth downstream conversion unit, for example, a downstream mixer 86 via a distributor / synthesizer 84. The local mixer 88 is supplied with a local oscillation signal from the local oscillator 88, and converts the frequency of the fourth downstream data signal into the third downstream data signal shown in the first embodiment. After the third downstream data signal is amplified by the amplifier 90, it is output to the input / output terminal 94 via the transmission / reception switch 92, and is output from the input / output terminal 94 to the personal computer 13.

On the other hand, the first upstream data signal from the personal computer 13 is supplied from the input / output terminal 94 of the transmission / reception unit 62 to the third upstream conversion means, for example, the upstream mixer 96 via the transmission / reception switch 92. The upstream mixer 96 includes a local mixer 88 and a downstream mixer 86.
And the same local oscillation signal as that supplied to the first and second uplink data signals (the fourth uplink data signal).
Is frequency-converted. The fourth uplink data signal has the same frequency band as the fourth downlink data signal. This fourth downlink data signal is transmitted from the antenna 80 shown in FIG. 4 to the antenna 78 of the transmission / reception unit 60 via the distribution combiner 84 and the input / output terminal 82.

The fourth upstream data signal received by the antenna 78 of the transmission / reception unit 60 is supplied to the fourth conversion means, for example, the upstream mixer 98, via the input / output terminal 76 of the transmission / reception unit 60 and the transmission / reception switch 74. The same local oscillation signal as that supplied to the downstream mixer 68 is supplied from the local oscillator 70 to the upstream mixer 98, and the fourth upstream data signal is frequency-converted into a second upstream data signal. This second uplink data signal is supplied to the television terminal 10 via the distributor / synthesizer 66 and the input / output terminal 64, and transmitted to the two-way joint reception system 2. Each of the transmission / reception units 60 and 62 is a small unit housed in one housing.

The transmission / reception unit 60 thus connected to the television terminal 10 and the personal computer 1
Since the wireless communication is performed with the transmission / reception unit 62 connected to the communication unit 3, it is not necessary to lay a cable, and the degree of freedom of the installation position of the personal computer 13 is increased.

The frequency band of the fourth uplink data signal and the fourth downlink data signal of the second embodiment is 5.3 as in the case of the first downlink data signal and the third uplink data signal.
A frequency band of GHz or 2.4 GHz can also be used. In this case, the wireless transmission distance is relatively short,
No significant attenuation occurs. Of course, other frequency bands can be used. In the second embodiment, the transmission / reception unit 6
Although the frequency conversion is simply performed at 0 and 62, for example, if a modulator and a demodulator are provided in the transmission and reception units 60 and 62, respectively, a modulation scheme different from the first downlink data signal and the third uplink data signal can be used. .

In the above two embodiments, the two-way joint receiving system 2 transmits a satellite signal and a terrestrial television broadcasting signal. However, the two-way joint receiving system 2 transmits at least a terrestrial television broadcasting signal. Can be used.

[0041]

As described above, the data transmission system according to the present invention, the transmission / reception converter and the transmission / reception unit used in this system use the bidirectional joint reception system, so that a new cable is laid. It does not need to be performed on a large scale and can be connected to the Internet with little transmission loss.

[Brief description of the drawings]

FIG. 1 is a block diagram of a data transmission system according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a converter used in the data transmission system of FIG.

FIG. 3 is a block diagram of a transmission / reception unit used in the data transmission system of FIG. 1;

FIG. 4 is a block diagram of a required part of a data transmission system according to a second embodiment of the present invention.

FIG. 5 is a block diagram of two transmission / reception units used in the data transmission system of FIG. 4;

[Explanation of symbols]

2 Two-way joint receiving system 13 Personal computer (information terminal equipment) 16 Base station 22 Converter (first down converter, second up converter) 38 Transmitter / receiver unit (second down converter, first up converter)

Claims (8)

[Claims] 1. A bidirectional joint receiving system for transmitting at least a television broadcast signal as a downlink signal to a plurality of terminals from a head side and transmitting an uplink signal from each terminal to the head side, and a bidirectional joint receiving system. Of the frequency capable of transmitting the first downlink data signal wirelessly transmitted from the base station in the bidirectional joint reception system.
First downlink conversion means for converting the data into a downlink data signal and outputting it to the head side of the two-way joint reception system; and a third downlink conversion means provided on the terminal side and capable of processing the second downlink data signal in the information terminal equipment. Second downlink conversion means for converting the data into a downlink data signal and outputting the downlink data signal to the information terminal device; and a first uplink data signal provided on the terminal side and input from the information terminal device, the bidirectional joint reception A first uplink data signal having a frequency that can be transmitted by the system and output to a terminal of the two-way joint reception system;
An uplink converter, provided on the head side of the two-way joint receiving system, for converting the second uplink data signal into a third uplink data signal having a frequency that can be wirelessly transmitted to the base station, And a second upstream conversion means for transmitting the data to the data transmission system. 2. The data transmission system according to claim 1, wherein the first down conversion unit and the second up conversion unit include:
A data transmission system having frequency conversion means, to each of which a local oscillation signal is supplied from a common local oscillator. 3. The data transmission system according to claim 1, wherein the second down-conversion unit and the first up-conversion unit each have a frequency conversion unit, and these frequency conversion units have a common local unit. A data transmission system in which a local oscillation signal is supplied from an oscillator. 4. The data transmission system according to claim 1, wherein the second downlink conversion means is connected to the terminal and converts a second downlink data signal into a fourth downlink data signal that can be transmitted wirelessly. And a fourth down converter connected to the information terminal device and converting a fourth down data signal into a third down data signal.
A first uplink converter connected to the information terminal device, converting a first downlink data signal from the information terminal device into a fourth uplink data signal that can be transmitted wirelessly, and transmitting the third uplink data signal. Uplink conversion means, connected to the terminal, receiving a fourth uplink data signal,
A data transmission system comprising: a fourth uplink converter for converting the data into a second uplink data signal. 5. A down conversion for converting a first downlink signal wirelessly transmitted from a base station to a second downlink signal of a frequency that can be transmitted in the two-way joint reception system, and transmitting the second downlink signal to the two-way joint reception system. Means for converting a first uplink signal transmitted from a terminal thereof via the two-way joint reception system into a second uplink signal having a frequency that can be transmitted to the base station by radio, and transmitting the second uplink signal to the base station. A transmission / reception converter comprising: 6. The transmission / reception converter according to claim 5, wherein said down-conversion means and said up-conversion means each have a frequency conversion means, and these frequency conversion means are provided with a common local oscillator to a local oscillator. Transmitter / receiver converter to which signals are supplied. 7. A first downlink signal wirelessly transmitted from a base station is converted by a head side of the two-way joint reception system and transmitted to each terminal of the two-way joint reception system.
Downlink conversion means provided in the terminal, for converting a second downlink signal of a frequency that can be transmitted by the two-way joint reception system into a third downlink signal that can be processed in the information terminal device; One uplink signal is frequency-converted into a second uplink signal having a frequency that can be transmitted by the two-way joint reception system and is transmitted from the terminal of the two-way joint reception system to the head side, A transmission / reception unit, comprising: an up-conversion unit provided in the terminal for outputting to a terminal of the reception system. 8. A first downlink signal wirelessly transmitted from a base station is converted on the head side of the two-way joint reception system and transmitted to each terminal of the two-way joint reception system.
A first transmitting means provided in the terminal, for converting a second downlink signal of a frequency that can be transmitted by the two-way joint reception system into a third downlink signal that can be transmitted wirelessly, and transmitting the third downlink signal; A first receiving unit that receives a third downlink signal, converts it into a fourth downlink signal that can be processed by the information terminal device, and outputs the fourth downlink signal to the information terminal device; A second transmission unit that converts a first uplink signal from the information terminal device into a second uplink signal in a frequency band that can be transmitted by radio, and transmits the second uplink signal; and a second transmission unit that is provided in the terminal and receives the second uplink signal. And a second transmitting unit that converts the signal into a third uplink signal having a frequency that can be transmitted in the two-way joint reception system and supplies the third uplink signal to a terminal of the two-way joint reception system.