JP2010287992A - Retransmission system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow terrestrial digital broadcasting using one wave to be viewed and heard even in a stop state of a retransmission system due to a power failure at a disaster or the like. <P>SOLUTION: In the retransmission system, a plurality of terrestrial digital television broadcasting signals received by a reception device 2 are converted to optical signals by an optical transmitter 14, and the optical signals are transmitted to transmission devices 4a and 4b via an optical fiber 7 and are converted to original terrestrial digital television broadcasting signals by the transmission devices 4a and 4b, and the original terrestrial digital television broadcasting signals are retransmitted. At a power failure, a reception-side single channel processing unit 12-1 on the side of the reception side 2 and the optical transmitter 14 are operated to convert a terrestrial digital television broadcasting signal using one specific wave to an optical signal and supply the optical signal to the optical fiber 7. The transmission device 4b is also operated at the power failure, and the original terrestrial digital television broadcasting signal using one specific wave is restored from the optical signal transmitted via the optical fiber 7 by an optical receiver 52, and the restored original signal is transmitted from a transmission antenna 56. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a re-transmission system, and in particular, to a countermeasure against power failure.

  Conventionally, there is a re-transmission system as disclosed in Patent Document 1, for example. According to the technique of Patent Document 1, a television broadcast signal received by a receiving antenna is amplified by a receiving amplifier and supplied onto a transmission path. A plurality of branching devices are arranged on the transmission path, and through these branching devices, a television broadcast signal is transmitted to a transmission amplifier installed for each region where a broadcast radio wave is to be retransmitted, amplified by the transmission amplifier, It is transmitted from the transmitting antenna. Each branch device includes a constant voltage circuit that generates a DC constant voltage from a commercial power source, and supplies the DC constant voltage to each transmission amplifier as a power source.

JP 2007-158392 A

  According to the technique of Patent Document 1, a DC constant voltage generated from a commercial power supply is supplied to each transmission amplifier as a power source. Therefore, when a power failure occurs, the transmission amplifier does not operate and re-transmission becomes impossible.

  Such a problem can be solved, for example, by installing an uninterruptible power supply in each branch device. However, when operating power is supplied to the transmission amplifier so that the television broadcast signals of all channels can be retransmitted, the retransmission can be maintained only for a short time unless the capacity of the uninterruptible power supply is increased. If the capacity of the uninterruptible power supply is increased, the cost increases.

  An object of the present invention is to provide a retransmission system that can maintain retransmission at low cost even if a power failure occurs.

  The retransmission system according to one aspect of the present invention includes a reception device, a communication line facility, and a plurality of transmission devices connected to the reception device via the communication line facility. The connecting line facility can transmit a signal from the receiving device as an electric signal, or can transmit it as an optical signal. The receiving apparatus includes a receiving side multiple channel processing unit and a receiving side single channel processing unit. The receiving side multi-channel processing means processes a terrestrial digital television broadcast signal of a plurality of channels so that it can be transmitted to the transmitting device via the connection line facility, and supplies the processed signal to the connection line facility. The receiving-side single channel processing means processes a specific single-channel digital terrestrial television broadcast signal so that it can be transmitted to the transmitting device via the connection line facility, and supplies it to the connection line facility. An example of processing in both channel processing means is amplification. The receiving-side power supply unit supplies operating power to the receiving-side multi-channel processing unit and the receiving-side single channel processing unit based on a commercial power source when commercial power is supplied, and the receiving side when the commercial power source is not supplied Operating power is supplied to the single channel processing means based on the battery. A part of the plurality of transmitting devices processes a signal from the receiving-side multi-channel processing means transmitted from the receiving device via the connection line facility so that the television receiver can receive the signal when commercial power is supplied. And supply to the transmitting antenna. The remaining ones of the plurality of transmission devices are based on the commercial power supply when commercial power is supplied, and based on the battery during a power failure, the reception-side single-channel processing transmitted from the reception device via the connection line facility The signal from the means is processed so as to be receivable by the television receiver and supplied to the transmitting antenna.

  In the re-transmission system configured as described above, even when a power failure occurs, the receiving apparatus operates on the receiving-side single-channel processing means by the battery of the receiving-side power supply unit, One wave of digital terrestrial television broadcast signal is transmitted to the transmission device. Some of the plurality of transmission devices operate by a battery and transmit a specific one-wave digital terrestrial television broadcast signal transmitted even when a power failure occurs. Therefore, even if a power failure occurs, a specific one-wave digital terrestrial television broadcast signal can be received by the viewer. Especially, even in the case of a power failure due to a disaster or the like, information on the disaster can be received. Viewers are available via John Broadcast. In addition, since both the receiving device and the transmitting device receive and transmit only a specific one-wave digital terrestrial television broadcast signal at the time of a power failure, the power required for this is small, and the power failure provided by these receiving device and transmitting device. The battery for time can also use a small capacity | capacitance, and can reduce cost.

  Some of the transmitters can receive signals from the receiving-side multiple channel processing means and the receiving-side single channel processing means by the television receiver based on the commercial power supply when supplying commercial power. In the event of a power failure, the signal from the receiving single channel processing means is processed so as to be received by the television receiver and supplied to the transmitting antenna in the event of a power failure. Can do.

  If comprised in this way, in all the transmission apparatuses, the specific one-wave digital terrestrial television broadcast signal can be retransmitted at the time of a power failure.

  As described above, according to the present invention, even if a power failure occurs, a specific one-wave digital terrestrial television broadcast signal can be retransmitted. For example, even if a power failure occurs due to a disaster or the like, This information can be obtained by receiving a specific one-wave digital terrestrial television broadcast signal. Moreover, since only one specific wave of digital terrestrial television broadcast signal is retransmitted, the power consumption is low and the battery of the transmitter and receiver used to operate in the event of a power failure can be used with a small capacity. Can be low cost.

It is a block diagram of the retransmission system of the first embodiment of the present invention. It is a block diagram of the receiving side power supply device of the retransmission system of FIG. It is a block diagram of the transmission side power supply part currently used with the retransmission system of FIG. It is a block diagram of the retransmission system of 2nd Embodiment of this invention.

  The re-transmission system according to the first embodiment of the present invention is a so-called gap filler system. As shown in FIG. 1, one receiving device 2, a plurality of transmitting devices 4a and 4b, and a communication line connecting them. The facility, for example, the optical communication line facility 5 is provided.

  The receiving device 2 is installed in the vicinity of the difficult viewing area, for example, at the top of a mountain where a television broadcast signal can be satisfactorily received. The television broadcast signal received here is transmitted to the transmission devices 4a and 4b via the optical communication line equipment 5. A plurality of transmission devices 4 a and 4 b are installed, and the reception device 2 and the transmission devices 4 a and 4 b are located at a considerable distance from each other and are connected via an optical communication line facility 5.

  As shown in FIG. 1, the receiving apparatus 2 has a receiving antenna 6 for receiving a digital terrestrial television broadcast signal in the UHF band, and a plurality of channels of terrestrial digital television broadcast signals received by the receiving antenna 6 are received. , Supplied to the head amplifier 10.

  The head amplifier 10 includes a plurality of reception-side single channel processing units 12-1 to 12-n that individually amplify terrestrial digital television broadcast signals of each channel. An output signal from the reception-side single channel processing unit 12-1 that amplifies a specific one-channel digital terrestrial television broadcast signal among the plurality of reception-side single channel processing units 12-1 to 12-n is an optical signal. A part of the connecting line facility 5 is supplied to an optical transmitter 14 provided integrally with the receiving device 2 and converted into an optical signal having a specific wavelength. Further, the remaining plural-channel digital terrestrial television broadcast signals amplified by the remaining receiving-side single-channel broadcast signal processing units 12-2 to 12-n are combined and part of the optical communication line equipment 5 However, the optical signal is supplied to an optical transmitter 16 provided integrally with the receiver 2, and is converted into an optical signal having a wavelength different from that of the optical transmitter 14. The reception side single channel broadcast signal processing unit 12-1 constitutes a reception side single channel processing means, and the reception side single channel broadcast signal processing units 12-2 to 12-n constitute reception side multiple channel processing means. Yes.

  As shown in FIG. 1, the optical signals from the optical transmitters 14 and 16 are combined in an optical synthesizer 34 that forms part of the optical communication line facility 5, and the combined optical signal is a part of the optical communication line facility 5. The light is distributed to a plurality of light by the optical distributor 36 and is transmitted to the transmitters 4a and 4b via the optical fibers 7 forming part of the optical communication line equipment 5 described above.

  The head amplifier 10 has a receiving-side power supply unit 18. As shown in FIG. 2, the reception-side power supply unit 18 includes a multi-wave operation power supply circuit 20. This converts an AC voltage of 30 to 60 V supplied from the AC power supply unit 22 included in the receiving device 2 shown in FIG. 1 into a DC voltage, and converts this into a DC voltage processing unit 12-1, 12-2 to 12 on the receiving side. -N and the optical transmitters 14 and 16 are supplied to operate them. The AC power supply unit 22 generates the AC voltage from the commercial power supply, and in the normal state where the commercial power supply is operating, the multi-wave operation power supply circuit 20 includes the reception-side single-channel signal processing units 12-1 and 12-. Operating power is supplied to 2 to 12-n and the optical transmitters 14 and 16, but when commercial power is not supplied (power failure) due to a disaster or the like, 12-1, 12-2 to 12-n and optical transmission The operating power cannot be supplied to the machines 14 and 16.

  The receiving-side power supply unit 18 is provided with an internal battery 24. When the power failure detection means, for example, the power failure detection circuit 26 detects a power failure of the commercial power supply, the voltage of the internal battery 24 is controlled by the output control circuit 28. The power is supplied to the wave operation power supply circuit 30, and is adjusted to a voltage suitable for operating only the reception-side single channel processing unit 12-1 and the optical transmitter 14 and supplied thereto. Therefore, even if a power failure occurs, the reception-side single channel processing unit 12-1 and the optical transmitter 14 automatically continue to operate. The internal battery 24 is monitored for charge / discharge status by the charge / discharge monitoring circuit 32, and is charged based on the AC voltage from the AC power supply unit 22 in the discharge status.

  The transmission device 4a is an optical signal from the optical transmitter 16 by means of a filter 40 that is part of the optical communication line facility 5 and is provided integrally with the transmission device 4a, from the optical signal at one distribution terminal of the optical distributor 36. (An optical signal obtained by converting a multi-channel digital terrestrial television broadcast signal) is extracted, and the original multi-channel is received by an optical receiver 42 which is a part of the optical communication line facility 5 but is provided integrally with the transmitter 4a. The digital terrestrial television broadcast signal is restored, and the power is amplified by a processing means such as an amplifier 44 and transmitted from the transmission antenna 46. Operating power is supplied to the optical receiver 42 and the amplifier 44 from the transmission-side power supply unit 48. The transmission-side power supply unit 48 generates operating power for the optical receiver 42 and the amplifier 44 from a commercial power supply. When the commercial power supply fails, supply of the operating power becomes impossible.

  The transmission device 4b is a part of the optical communication line facility 5, but the optical signal from the optical transmitter 14 (light obtained by converting a single-channel digital terrestrial television broadcast signal) by a filter 50 provided integrally with the transmission device 4b. Signal) is extracted, and is restored to the original single-channel digital terrestrial television broadcast signal by the optical receiver 52 which is part of the optical communication line facility 5 but is provided integrally with the transmission device 4b. The restored single-channel digital terrestrial television broadcast signal is power-amplified by a processing means such as an amplifier 54 and transmitted from a transmission antenna 56.

  The optical receiver 52 and the amplifier 54 are operated by operating power from an uninterruptible power supply, for example, the transmission-side power supply unit 58. As shown in FIG. 3, the transmission-side power supply unit 58 includes a normal operation power supply circuit 60. The normal operation power supply circuit 60 converts an AC voltage of 100 V supplied from a commercial power source into a DC voltage, and supplies this to the optical receiver 52 and the amplifier 54 to operate them. The normal operation power supply circuit 60 cannot supply operating power to the optical receiver 52 and the amplifier 54 when commercial power is not supplied (power failure) due to a disaster or the like.

  The transmission-side power supply unit 60 is provided with an internal battery 62. When the power failure detection means, for example, the power failure detection circuit 64 detects a power failure of the commercial power supply, the voltage of the internal battery 62 is controlled by the output control circuit 66, and the power failure is detected. The power is supplied to the power supply circuit 68 for time operation, where it is adjusted to a voltage suitable for operating the optical receiver 52 and the amplifier 54 and supplied to the optical receiver 52 and the amplifier 54. Therefore, even if a power failure occurs, the optical receiver 52 and the amplifier 54 automatically continue operation. The charge / discharge state of the internal battery 64 is monitored by the charge / discharge monitoring circuit 70.

  In the re-transmission system configured as described above, when no power failure occurs, the receiving-side single channel processing units 12-1, 12-2 to 12-n and the optical transmitters 14, 16 of the receiving device 2 are connected to the receiving side. The transmission device 4a is operated by the transmission-side power supply unit 48, and the transmission device 4b is operated by the normal-time operation power supply circuit 60 of the transmission-side power supply unit 58. It is working. Accordingly, the terrestrial digital television broadcast signals of the reception-side single channel processing units 12-2 to 12-n are converted into optical signals by the optical transmitter 16, and the original terrestrial digital television broadcast signals are transmitted by the transmission device 4a. And is retransmitted from the transmission antenna 46. Further, the single-wave digital terrestrial television broadcast signal of the reception-side single channel processing unit 12-1 is converted into an optical signal by the optical receiver 14, and the original single-wave digital terrestrial television broadcast signal is transmitted by the transmitter 4b. And is retransmitted from the transmission antenna 56.

  When a power failure occurs on the receiving device 2 side, the supply of operating power from the multi-wave operation power supply circuit 20 of the reception-side power supply unit 18 is stopped, but the one-wave operation power supply circuit 30 automatically operates. As a result, the receiving-side single channel processing units 12-2 to 12-n and the optical transmitter 16 stop operating, but the receiving-side single channel processing unit 12-1 and the optical transmitter 14 continue to operate. To do. As a result, transmission of an optical signal obtained by converting a specific one-wave digital terrestrial television broadcast signal to the transmission devices 4a and 4b is continued even if a power failure occurs.

  The transmission device 4a does not operate when a power failure occurs, and the transmission device 4a does not retransmit each terrestrial digital television broadcast signal from the reception-side single channel processing units 12-2 to 12-n. However, in the transmitter 4b, the optical receiver 52 and the amplifier 54 are operated by the power supply circuit 68 for power failure operation, and a specific one-wave digital terrestrial television broadcast signal is retransmitted.

  Therefore, even if a power failure occurs, retransmission of a specific one-wave television broadcast signal is continued by the transmission device 4b. For example, even when a power outage occurs based on a disaster or the like, the viewer can obtain information on the disaster by receiving a specific one-channel digital terrestrial television broadcast signal. In addition, in order to enable retransmission of a specific one-channel digital terrestrial television broadcast signal, the receiving apparatus 2 backs up only the single channel processing unit 12-1 and the optical transmitter 14, so that backup is possible. A small capacity battery can be used for the internal battery 24 to be used, and the cost can be reduced.

  FIG. 4 shows a retransmission system according to the second embodiment. This re-transmission system is configured in the same manner as the re-transmission system of the first embodiment except that the transmission device 4a ′ is configured to re-transmit a specific one-channel digital terrestrial television broadcast signal in the event of a power failure. ing. The same parts are denoted by the same reference numerals, and the description thereof is omitted.

  The filter 50a and the optical receiver 52a, which are part of the optical communication line equipment having the same configuration as the filter 50 and the optical receiver 52, respectively, which are part of the optical communication line equipment 5 provided on the transmission device 4b side, are the transmission equipment. The transmitter 4a is provided integrally with the 4a 'side. Further, the transmission device 4a ′ is provided with an amplifier 54a and a transmission-side power supply unit 58a having the same configuration as the amplifier 54 and the transmission-side power supply unit 58 of the transmission device 4b. Accordingly, the optical receivers 42 and 52a and the amplifiers 44 and 54a operate during normal operation, and the optical receiver 52a and the amplifier 54a operate during a power failure.

  The distributed optical signal from the optical distributor 36 is partly distributed in the optical communication line equipment 5 but is divided into two by the coupler 100 provided integrally with the transmission device 4a ′ and supplied to the filters 40 and 50a. As a result, similarly to the amplifier 44 of the first embodiment, a plurality of terrestrial digital television broadcast signals are output from the amplifier 44, and a specific one wave is output from the amplifier 54 a as in the amplifier 54 of the first embodiment. Terrestrial digital television broadcast signal is output. These are combined by the combiner 102 and transmitted from the transmission antenna 46.

  With this configuration, the optical receivers 42 and 52a and the amplifiers 44 and 54a operate in a normal state, and the terrestrial digital television broadcast signal is transmitted from the transmission antenna 46. In the event of a power failure, the optical receiver 52a and the amplifier 54 a operates, and only one specific digital terrestrial television broadcast signal is transmitted from the transmission antenna 46. In the transmission device 4b, a specific one-wave digital terrestrial television broadcast signal is transmitted from the transmission antenna 46 during both a normal time and a power failure.

  In the first embodiment described above, the transmission device 4a transmits a terrestrial digital television broadcast signal having a plurality of waves only during normal times. In the second embodiment, the transmission device 4a ′ has a plurality of waves during normal times. The digital terrestrial television broadcast signal is transmitted and a specific one-wave digital terrestrial television broadcast signal is transmitted in the event of a power failure. However, the transmitters 4a and 4a 'of both embodiments may be mixed and arranged. .

  For example, the receiving apparatus, the communication line facility, and the transmitting apparatus in the above-described embodiments can be provided together with an optical joint receiving system or a joint receiving system using a coaxial cable to configure the system. In the above embodiment, a receiving device and a dedicated communication line facility are used. However, when the communication line facility is provided in the common reception system, the communication line facility can be shared with the common reception system, so an economical retransmission system. Can be provided. In both of the above embodiments, the receiving device and the retransmitting device are connected by the optical communication line equipment 5, but they can also be connected by using a connection line equipment using a coaxial cable.

2 Receiving device 4a 4a '4b Transmitting device 5 Optical communication line equipment (connection line equipment)
12-1 Receiving side single channel processing unit (receiving side single channel processing means)
12-2 to 12-n Reception side single channel processing unit (reception side multiple channel processing means)
18 Receiver power supply

Claims (2)

In a re-transmission system comprising a receiving device, a connecting line facility, and a plurality of transmitting devices to which the receiving device is connected via the connecting line facility,
The receiving device is:
Receiving-side multi-channel processing means for processing a terrestrial digital television broadcast signal of a plurality of channels so as to be transmitted to the transmitting device via the connection line facility, and supplying the signal to the connection line facility;
Receiving-side single-channel processing means for processing a specific single-channel digital terrestrial television broadcast signal to be able to be transmitted to the transmission device via the connection line facility, and supplying the transmission device to the transmission device via the connection line facility; ,
When commercial power is supplied, operating power is supplied to the reception side multi-channel processing means and the reception side single channel processing means based on commercial power, and when the commercial power is not supplied, a battery is supplied to the reception side single channel processing means. A receiving-side power supply that supplies operating power based on
A part of the plurality of transmission devices,
At the time of commercial power supply, the signal from the receiving side multi-channel processing means transmitted from the receiving device via the connection line equipment is processed so as to be received by a television receiver, and supplied to the transmitting antenna.
The remaining ones of the plurality of transmitting devices are
Based on the commercial power supply when supplying commercial power, and based on the battery during a power failure, the signal from the receiving-side single channel processing means transmitted from the receiving device via the connecting line equipment is transmitted to the television receiver. A re-transmission system that processes receivable and supplies it to the transmitting antenna. The re-transmission system according to claim 1, wherein a part of the transmission device is configured to receive from the reception-side multi-channel processing unit and the reception-side single channel processing unit based on the commercial power source when commercial power is supplied. The signal is processed so that it can be received by the television receiver and supplied to the transmitting antenna, and in the event of a power failure, the signal from the receiving-side single channel processing means is processed so that it can be received by the television receiver based on the battery. Re-transmission system that supplies power to the transmitting antenna

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