JP2001223627A - Re-broadcast system and receiver mounting method for the system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a re-broadcast system and a receiver mounting method for the system, that can surely prevent oscillation due to a sneaked high-frequency signal between a transmitter and a receiver with a simple and inexpensive configuration, in the case of the re-broadcast system that receives a radio broadcast program for radio receivers emitted to an area, transmits the radio program to a radio wave dead zone such as inside of a tunnel and is applied to a radio re-broadcast installation or the like. SOLUTION: Only a transmitter (TX) 21 is placed in a station building 20 and only a receiver (RX) 12 is placed in an electromagnetic shield room 10a in an antenna pole 10 installed at a point apart from the station building 20 by a prescribed distance in the receiver and the transform constituting the components of the re-broadcast system, and this system is characterized in that the oscillation due to a sneaked high-frequency signal between the transmitter, and the receiver can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rebroadcasting system applied to a rebroadcasting facility for receiving a radio broadcast such as a radio broadcast radiated to an area and transmitting the radio broadcast to a radio wave blind zone such as a tunnel. And receiver mounting method of the system

[0002]

2. Description of the Related Art Conventionally, in a radio rebroadcasting facility for receiving a radio broadcast radiated to an area and transmitting the radio broadcast to a radio blind zone such as in a tunnel, a transmitter and a receiver using the same frequency are used. Both were set up in one station building. FIG. 2 shows the configuration of a conventional radio rebroadcast system of this kind.

In FIG. 2, reference numeral 40 denotes an antenna pole which is erected at a point which needs radio rebroadcasting (supply of radio broadcast radio waves) and which is relatively close to a radio wave dead zone such as a car traffic tunnel. 41a, 41b and 41n are reception antennas (ANT) provided on the top of the antenna pole 40 for receiving radio broadcasts radiated to the area.

[0004] Reference numeral 50 denotes a station of the radio rebroadcasting facility, 51 denotes a receiver (RX) provided in the station 50, and 52 denotes a transmitter (TX) also provided in the station 50.
Reference numeral 60 denotes a radio wave insensitive zone such as a car traffic tunnel requiring radio rebroadcasting, 61 denotes a transmission impedance matching device, 62
Is a terminating resistor, 63 is a transmission antenna cable, Cz
Is a coaxial cable.

[0005] In the conventional radio rebroadcasting system having such a configuration, the transmitter and the receiver using the same frequency are both installed in one station, so that the transmitter There is a problem that oscillation occurs due to the wraparound of the high-frequency signal between the receivers. Conventionally, as an effective means for preventing this sneak oscillation, a receiver and a transmitter each have a housing structure having a high electromagnetic shielding effect and have a structure for minimizing radio wave leakage. However, this type of electromagnetic shield structure requires the use of a thick steel casing in order to expect a sufficient electromagnetic shield effect. There have been various inconveniences, such as inconvenience and a significant increase in cost.

[0006]

As described above, in a conventional radio rebroadcasting facility for receiving a radio broadcast radiated to an area and transmitting it to a radio wave insensitive zone such as in a tunnel, the same frequency is used. Since both the transmitter and the receiver used are installed in one station, there is a problem that oscillation occurs due to the sneaking of a high-frequency signal between the transmitter and the receiver.

[0007] The present invention has been made in view of the above circumstances,
In a rebroadcasting system that receives radio broadcasts such as radio broadcasts radiated to an area and transmits them to a radio blind zone, oscillation caused by a high-frequency signal circulating between a transmitter and a receiver with a simple and inexpensive configuration It is an object of the present invention to provide a rebroadcast system and a receiver mounting method of the rebroadcast system which can surely prevent the rebroadcasting.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a rebroadcasting system for receiving a radio broadcast such as a radio broadcast radiated to an area and transmitting the radio broadcast to a radio blind zone. The system will be installed inside the building, and the receiver will be installed inside a steel antenna pole where the receiving antenna will be installed.

That is, the present invention provides a receiver for a rebroadcasting system applied to, for example, radio rebroadcasting equipment, which receives a radio broadcast such as a radio radiated to an area and transmits the radio broadcast to a radio blind zone such as in a tunnel. The mounting method is characterized in that the receiver is mounted in an antenna pole for installing a receiving antenna.

The present invention also provides a receiver for a rebroadcasting system applied to, for example, radio rebroadcasting equipment for receiving a radio broadcast such as a radio radiated to an area and transmitting the radio broadcast to a radio blind zone such as in a tunnel. An implementation method, wherein the receiver is installed in an antenna facility, the transmitter is installed in a station separated from the antenna facility, and oscillation is caused by a high-frequency signal from the transmitter to the receiver. The feature is that it prevented.

The present invention also provides a receiver for a rebroadcasting system applied to, for example, radio rebroadcasting equipment for receiving a radio broadcast such as a radio radiated to an area and transmitting the radio broadcast to a radio blind zone such as in a tunnel. In a mounting method, a room having a shielding effect is provided in an antenna pole in which a reception antenna is installed, and the receiver is installed in the room, and a high-frequency signal is wrapped around from the transmitter to the receiver. Oscillation is prevented.

The present invention also relates to a rebroadcasting system such as a radio rebroadcasting facility for receiving a radio broadcast such as a radio radiated to an area and transmitting the radio broadcast to a radio blind zone such as in a tunnel. An antenna pole in which a receiving antenna is installed, and a cavity is formed at least at a base; a receiver mounted in the cavity of the antenna pole; and a first transmission for transmitting a reception signal of the antenna to the receiver Road, a transmitter installed at a location distant from the antenna pole, and a second transmitting an output signal of the receiver to the transmitter.
And a rebroadcasting transmission antenna that radiates a high-frequency signal output from the transmitter as a rebroadcasting radio wave to a radio blind zone such as in a tunnel.

As described above, the transmitter is installed in the station building, and the receiver is mounted in the antenna pole where the receiving antenna and the like are installed. From being
Sneak oscillation between the transmitter and the receiver can be reliably prevented.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a radio rebroadcasting system according to one embodiment of the present invention.

In the drawing, reference numeral 10 denotes an antenna pole which is required to stand for a radio rebroadcast (supply of radio broadcast radio waves) and which is located relatively close to a radio wave insensitive zone such as a car traffic tunnel. The electromagnetic shielding room 10a which is comprised and provided the iron door for maintenance in the base part is formed.

Reference numerals 11a, 11b,..., 11n denote receiving antennas (ANT) mounted on the tops of the antenna poles 10, respectively. Receive by band etc.

Reference numeral 12 denotes a receiver (RX) installed in a room 10a provided in the antenna pole 10, and the reception antennas (ANT) 11a, 11b,.
Is input via a coaxial cable (Cz), converted into a signal of a predetermined frequency, for example, a low-frequency signal with little loss, amplified, and output.

Reference numeral 20 denotes a station building of a radio rebroadcasting facility.
Reference numeral 1 denotes a transmitter (TX) provided in the station building 20. A signal output from the receiver (RX) 12 is input via a coaxial cable (Cz), and the original (at the time of reception) is input. The signal is converted to a high-frequency signal of a carrier frequency, power-amplified, and output.

Reference numeral 30 denotes a radio wave insensitive zone such as a car traffic tunnel requiring radio rebroadcasting. Numerals 31 to 33 each constitute a component of a rebroadcasting radio transmission antenna facility erected in a radio wave insensitive zone, 31 is a transmission impedance matching device, 32 is a terminating resistor, and 33 is a rebroadcasting radio transmission antenna. is there. The transmission impedance matching unit 31 receives the high-frequency signal output from the transmitter (TX) 21 via a coaxial cable (Cz), matches the impedance, and outputs the signal to the rebroadcasting radio transmission antenna 33. The transmitting antenna body 33 is provided with the transmitting impedance matching unit 31.
And a high-frequency signal output from the transmitter (TX) 21 in the space where the high-frequency signal is output as a radio rebroadcast radio wave (transmission high-frequency signal).

In the above configuration, the radio broadcast radiated to the area including the rebroadcasting equipment is transmitted through receiving antennas (ANT) 11a, 11b,.
11n.

The above-mentioned receiving antennas (ANT) 11a, 11
b,..., 11n receive radio broadcast radio waves (received high-frequency signals) via a coaxial cable (Cz) in a receiver (RX) installed in an electromagnetic shielding room 10a provided in the antenna pole 10 12 is input.

The receiver (RX) 12 installed in the electromagnetic shielding room 10a is provided with the above-mentioned receiving antennas (ANT) 11a, 1
The radio broadcast radio waves (received high-frequency signals) received at 1b,..., 11n are converted into low-frequency signals with little loss and installed near a radio wave insensitive zone (for example, a car traffic tunnel) 30 via a coaxial cable (Cz). To the local office 20.

The transmitter (T) provided in the station 20
X) 21 inputs a low-frequency signal whose frequency has been converted from a receiver (RX) 12 installed in the electromagnetic shielding room 10a via a coaxial cable (Cz), and converts the low-frequency signal into an original radio frequency ( To a carrier frequency at the time of reception, amplify the power, and convert the high-frequency signal through a coaxial cable (Cz).
The signal is transmitted to the rebroadcasting radio transmission antenna equipment (31 to 33) provided in the radio wave insensitive zone (vehicle traffic tunnel) 30.

A transmission impedance matching device 31 which is a component of the rebroadcast radio wave transmitting antenna equipment inputs a high-frequency signal output from the transmitter (TX) 21 via a coaxial cable (Cz), and adjusts the impedance. After matching, it is output to the antenna 33 for rebroadcasting radio wave transmission.

The transmitting antenna body 33 erected between the transmitting impedance matching device 31 and the terminating resistor 32 is
In the installation space, the high-frequency signal output from the transmitter (TX) 21 is output (radiated) as a radio rebroadcast radio wave (transmission high-frequency signal).

As described above, only the transmitter (TX) 21 is provided in the station 20 and the receiver (RX) 12 is connected to the station 20 out of the receiver and the transmitter constituting the components of the radio rebroadcasting system. With the configuration provided in the electromagnetic shielding room 10a in the antenna pole 10 installed at a point separated by a predetermined distance, sneak oscillation between the transmitter and the receiver can be reliably prevented.

In the above-described embodiment, the receiver (RX) 12 installed in the electromagnetic shielding room 10a receives radio broadcast radio waves (ANT) 11a, 11b,. The high-frequency signal (received high-frequency signal) is converted into a low-frequency signal with low loss, and a transmitter (a transmitter (20) provided in a station building 20 installed near a radio wave dead zone (for example, a car traffic tunnel) 30 via a coaxial cable (Cz)). TX) 21, but is not limited to this. For example, high frequency (HF)
Means for converting the signal to a band signal and transmitting the signal, or means for converting the signal to an intermediate frequency (IF) band signal and transmitting the signal, or transmitting the signal at the receiving frequency and changing the transmitter to a high-frequency power amplifier without re-converting the frequency. Any means such as a transmitting means may be used.

In the above embodiment, the radio rebroadcasting system is taken as an example. However, the present invention is not limited to this. For example, various local radio systems including radio transmission, such as television broadcasting, radio transmission of audio and video, and the like. Applicable to broadcasting.

[0030]

As described above in detail, according to the present invention, a radio broadcast such as a radio radiated to an area is received and transmitted to a radio wave insensitive zone such as in a tunnel. In a rebroadcasting system, only a transmitter is installed in a station out of a receiver and a transmitter, and an electromagnetic shield in an antenna pole is installed at a point separated from the station by a predetermined distance from the station. Provision of a rebroadcast system and a receiver mounting method of the same system that can reliably prevent oscillation due to sneaking of a high-frequency signal between a transmitter and a receiver with a simple and inexpensive configuration provided in a room it can.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a radio rebroadcast system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional radio rebroadcast system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Antenna pole 10a ... Electromagnetic shielding room 11a, 11b, ..., 11n ... Receiving antenna (ANT) 12 ... Receiver (RX) 20 ... Station 21 ... Transmitter (TX) 30 ... Radio wave insensitive zone (automobile tunnel 31: impedance matching unit for transmission 32: terminating resistor 33: antenna for rebroadcast radio wave transmission Cz: coaxial cable

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Osamu Hayashida, Inventor 3-term, Asahigaoka 3-chome, Hino-shi, Tokyo F-term in Toshiba Hino Plant (reference) 5K072 AA22 BB03 BB14 BB25 CC34 DD11 DD16 DD17 GG01 GG14

Claims (6)

[Claims] 1. A rebroadcasting system for receiving broadcast radio waves in an area and transmitting the radio waves to a radio wave blind zone, wherein a receiver is mounted in an antenna pole for installing a receiving antenna. Receiver implementation method. 2. In a rebroadcasting system for receiving broadcast radio waves in an area and transmitting the radio waves to a radio wave insensitive zone, the receiver is installed in an antenna facility, and the transmitter is installed in a station separated from the antenna facility. A method for mounting a receiver in a rebroadcasting system, wherein the receiver is installed to prevent oscillation caused by sneak in of a high-frequency signal from the transmitter to the receiver. 3. A rebroadcasting system in which a receiver and a transmitter handle high-frequency signals in the same frequency band, a room having a shielding effect is provided in an antenna pole on which a receiving antenna is installed, and the receiver is provided in the room. A method for mounting a receiver in a rebroadcasting system, wherein oscillation caused by sneaking of a high-frequency signal from the transmitter to the receiver is prevented. 4. An antenna pole having a receiving antenna installed at the top and a cavity formed at least at a base, a receiver mounted in the cavity of the antenna pole, and a receiver receiving the antenna signal. A first transmission line for transmitting an output signal from the antenna pole, a second transmission line for transmitting an output signal of the receiver to the transmitter, and an output from the transmitter. A rebroadcasting system, comprising: a rebroadcasting transmission antenna for radiating the obtained high-frequency signal as a rebroadcasting radio wave to a radio wave insensitive zone. 5. The rebroadcast system according to claim 4, wherein said first transmission path transmits a high-frequency signal frequency-converted by said receiver to said transmitter. 6. The rebroadcasting system according to claim 4, wherein the first transmission path transmits a low-frequency signal frequency-converted by the receiver to the transmitter, and converts the low-frequency signal to the original frequency by the transmitter. .