JP5320157B2 - Re-transmission system and receiver and transmitter for the system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow terrestrial digital broadcasting to be continued with a small-capacity battery in spite of a power failure. <P>SOLUTION: In a retransmission system wherein a reception device 2 is connected to a transmission device 4 via optical connection line equipment 5, the reception device 2 receives a terrestrial digital television broadcast signal of one wave by a reception antenna 6 and amplifies the received signal by a reception-side single channel broadcasting signal processing unit 12-1, and a reception-side power source section 18 supplies an operation power to the reception-side single channel broadcasting signal processing unit 12-1 when a commercial power is not supplied. An output signal of the reception-side single channel broadcasting signal processing unit 12-1 is supplied to the transmission device 4 via optical connection line equipment 5 when the commercial power is not supplied. The transmission device 4 processes the terrestrial digital television broadcast signal of the one wave transmitted via the optical connection line equipment 5 during non-supply of the commercial power, by a transmission-side single channel processing unit 40 and supplies the processed signal to a transmission antenna 58. A transmission-side power source section 60 supplies an operating power to the transmission-side single channel processing unit 40 when the commercial power is not supplied. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a re-transmission system and a reception device and a transmission device used in the system, and more particularly to a device that has taken measures against a 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 a low cost even if a power failure occurs, and a reception device and a transmission device used in the retransmission system.

  The re-transmission system of the present invention includes a reception device, a communication line facility, and a transmission device connected to the reception device via the communication line facility. The receiving apparatus has a receiving side multi-channel processing means. The receiving-side multi-channel processing means processes a multi-channel digital terrestrial television broadcast signal so that it can be transmitted to the transmission device via a connection line facility, and supplies the transmission device to the transmission device. The receiving apparatus also has a receiving-side single channel processing means. The reception-side single channel processing means processes a specific single channel digital terrestrial television broadcast signal so that it can be transmitted to the transmission device via a connection line facility, and supplies the transmission device to the transmission device. The specific single channel may be one of a plurality of channels of terrestrial digital television broadcast signals, or may be another single terrestrial digital television broadcast signal. The processing performed by the reception-side multichannel processing means and the reception-side single channel processing means includes, for example, conversion from an optical signal to transmission from the reception device when transmission from the reception device to the transmission device is performed by an optical signal. When transmission to the device is performed by an electrical signal, amplification and frequency conversion are included. The receiving device also includes a receiving-side power supply unit, which supplies operating power to the receiving-side multiple channel processing means and the receiving-side single channel processing means when commercial power is supplied, and when the commercial power is not supplied. Operating power is supplied to the receiving-side single channel processing means. The transmission apparatus includes a transmission side multiple channel processing unit and a transmission side single channel processing unit. The transmission side multi-channel processing means processes the signal from the reception side multi-channel processing means transmitted from the receiving device via the communication line equipment so that the signal can be received by the television receiver, and supplies the signal to the transmission antenna. The transmission-side single channel processing means processes the signal from the reception-side single channel processing means transmitted from the receiving device via a connection line facility so that the signal can be received by the television receiver, and supplies the signal to the transmission antenna. . A transmission-side power supply unit supplies operating power to the transmission-side multiple-channel processing means and the single-channel processing means based on a commercial power supply when the commercial power is supplied, and the transmission-side single channel when the commercial power is not supplied Operating power is supplied to the processing means based on the battery.

  In the re-transmission system configured as described above, when a power failure occurs, the reception-side power supply unit cannot supply operating power based on the commercial power supply to the reception-side multichannel processing means and the reception-side single channel processing means. Based on the battery, operating power is supplied to the receiving multi-channel processing means. Therefore, a specific single channel digital terrestrial television broadcast signal is transmitted to the transmission device even if a power failure occurs. Similarly, when a power failure occurs in the transmission device, the transmission-side single channel processing means is operating, and the retransmission of a specific single channel digital terrestrial television broadcast signal transmitted from the reception device causes a power failure. It will continue. Even if a power failure occurs, single-channel digital terrestrial television broadcasts are retransmitted. For example, even if a power failure occurs due to a disaster, information about the disaster can be obtained by this single-channel digital terrestrial television broadcast. Can know. In addition, since only the reception side and transmission side single channel signal processing means are backed up, the batteries provided in the reception side and transmission side power supply units can be used with a small capacity, and the cost can be reduced. it can. Note that even when a power failure occurs on only one of the reception device side and the transmission device side, the re-transmission of a specific single channel digital terrestrial television broadcast signal is reliably performed.

  In the re-transmission system, the receiving device includes: a receiving antenna that receives each terrestrial digital television broadcast signal; a distributing unit that distributes the received signal of the receiving antenna into two; and The preamplifier means that amplifies one of the distribution outputs and enters a signal cutoff state when the commercial power is not supplied, the other distribution output of the distribution means and the output of the preamplifier means are input, Receiving-side multiple channel processing means and combining means for supplying to the receiving-side single channel processing means.

  For example, it is possible to back up the amplifying means so as to be in an amplified state even when commercial power is not supplied, but in this case, a battery having a large capacity must be used. Therefore, when commercial power is supplied, the reception signal of the reception antenna distributed by the distribution means is amplified by the pre-amplification means and supplied to the reception-side multiple channel processing means and the reception-side single channel processing means via the synthesis means. In the event of a power failure, the preamplifier means is in a signal cut-off state, and the signal of the receiving antenna distributed by the distributing means is supplied to the receiving side multi-channel processing means and the receiving side single channel processing means via the combining means. Even when power is not supplied, the reception side receiving signal from the receiving antenna is maintained in the receiving side multi-channel processing means and the processing means for obtaining the receiving side single channel, and the battery capacity is prevented from increasing.

  In the above retransmission system, the communication line facility may be an optical communication line facility. In this case, the reception-side multiple channel processing means and the reception-side single channel processing means multiplex optical signals of different wavelengths and transmit the multiplexed signals to the transmission device via the optical connection line equipment. When configured in this manner, the receiving-side single channel processing means that operates at the time of a power failure transmits a wavelength different from that of the receiving-side multiple channel processing means to the connection line equipment, and only the transmitting-side single-channel processing means on the transmitting device side By operating the, it becomes possible to save power, and it is not necessary to provide a dedicated transmission line for each of them, so that the cost can be reduced.

  As described above, according to the present invention, even if a power failure occurs, the re-transmission of a specific one-channel digital terrestrial television broadcast is continuously performed. However, it is possible to view information on disasters caused by a specific one-channel digital terrestrial television broadcast. In addition, since only the reception side and transmission side single channel signal processing means for a specific one channel are backed up by the battery, a small capacity battery can be used, and an increase in cost can be prevented. .

1 is a block diagram of a retransmission system according to an embodiment of the present invention. 2 is a schematic diagram showing an arrangement of receiving devices and transmitting devices of the retransmission system of FIG. 1. It is a block diagram of the power supply part of the receiver used in the retransmission system of FIG. It is a block diagram of the power supply part of the transmitter used in the retransmission system of FIG.

  The re-transmission system of one embodiment of the present invention is a so-called gap filler system. As shown in FIG. 1, the re-transmission system includes a reception device 2, a transmission device 4, and a connection line facility connecting them, for example, an optical communication facility 5. Have. In the receiver 2, the optical transmitters 14 and 16 of the optical communication line facility 5 are integrally formed. In the transmission device 4, the coupler 40, the filters 43 and 50, and the optical receivers 46 and 52 of the optical communication line equipment 5 are integrally configured.

  For example, as shown in FIG. 2, the receiving device 2 is installed near a difficult viewing area, for example, at a position where a television broadcast signal can be received satisfactorily, for example, at the top of a mountain. The television broadcast signal received here is transmitted to the transmitter 4. As shown in FIG. 2, a plurality of transmission apparatuses 4 are installed, and the reception apparatus 2 and each transmission apparatus 4 are located at a considerably separated position.

  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. The signal is amplified by a preamplifier, for example, a preamplifier 8 and then supplied to a 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 terrestrial digital television broadcast signal of a specific channel among the plurality of reception-side single channel processing units 12-1 to 12-n is optically transmitted. And is converted into an optical signal of a specific wavelength. The remaining multi-channel terrestrial digital television broadcast signals amplified by the remaining receiving-side single channel processing units 12-2 to 12-n are combined and supplied to the optical transmitter 16, where optical transmission is performed. It is converted into an optical signal having a wavelength different from that of the machine 14.

  The head amplifier 10 has a receiving-side power supply unit 18. As shown in FIG. 3, 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 shown in FIG. 1 into a DC voltage, which is converted into reception side single channel processing units 12-1, 12-2 to 12-n and optical transmission. These are supplied to the machines 14 and 16 to operate them. The AC power supply unit 22 generates the AC voltage from the commercial power source. In the normal state in which the commercial power source is operating, the multi-wave operation power source circuit 20 includes the reception-side single channel processing units 12-1 and 12-2. To 12-n and the optical transmitters 14 and 16, but when commercial power is not supplied due to a disaster or the like (power failure), 12-1, 12-2 to 12-n and the optical transmitter 14 and 16 cannot be supplied with operating power.

  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. In preparation for the case where it is necessary to continue digital terrestrial television broadcasting of one wave for a long time, an external battery 33 is also provided outside the receiving apparatus 2, and from now on, operating power will be supplied to the receiving-side single channel processing unit 12-1. The optical transmitter 14 can be supplied.

    As shown in FIG. 1, the optical signals from the optical transmitters 14 and 16 are combined by the optical combiner 34 of the optical communication line facility 5 and distributed into a plurality by the optical distributor 36 of the optical communication line facility 5. It is supplied to each transmitter 4 via the optical fiber 37 of the facility 5.

  In the transmission device 4, the coupler 40 receives an optical signal from one distribution terminal of the optical distributor 36 and supplies it to the transmission side single channel processing unit 42 and the transmission side multichannel processing unit 44.

  The transmission-side single channel processing unit 42 extracts the optical signal from the optical transmitter 14 (the optical signal obtained by converting the single-channel digital terrestrial television broadcast signal) from the optical signal from the coupler 40 by the filter 43, and receives the optical signal. The machine 46 restores the original single channel digital terrestrial television broadcast signal. The restored single-channel digital terrestrial television broadcast signal is amplified by an amplifier 48. Similarly, in the transmission side multi-channel processing unit, an optical signal from the optical transmitter 16 (an optical signal obtained by converting a multi-channel digital terrestrial television broadcast signal) is extracted from the optical signal from the coupler 40 by the filter 50 to obtain an optical signal. The receiver 52 restores the original digital terrestrial television broadcast signal of a plurality of channels, and the power is amplified by the amplifier 54. The terrestrial digital television broadcast signals amplified by the amplifiers 48 and 54 are combined by a combiner 56 and transmitted from a transmission antenna 58.

  The transmission-side single channel processing unit 42 and the transmission-side multi-channel processing unit 44 are operated by operating power from an uninterruptible power supply device, for example, the transmission-side power supply unit 60. As shown in FIG. 4, the transmission-side power supply unit 60 includes a multi-wave operation power supply circuit 62. The multi-wave operation power supply circuit 62 converts a 100V AC voltage supplied from a commercial power source into a DC voltage, and supplies the DC voltage to the transmission side single channel processing unit 42 and the transmission side multichannel processing unit 44. Make it work. The multi-wave operation power supply circuit 62 cannot supply operating power to the transmission-side single channel processing unit 42 and the transmission-side multichannel processing unit 44 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 64. When the power failure detection means, for example, the power failure detection circuit 66 detects a power failure of the commercial power supply, the voltage of the internal battery 64 is controlled by the output control circuit 68. The power is supplied to the wave operation power supply circuit 70, adjusted to a voltage suitable for operating only the transmission-side single channel processing unit 42, and supplied to the transmission-side single channel processing unit 42. Therefore, even if a power failure occurs, the transmission side single channel processing unit 42 automatically continues the operation. The charge / discharge state of the internal battery 64 is monitored by the charge / discharge monitoring circuit 72.

  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 side single-channel processing unit 42 and the transmission-side multi-channel processing unit 44 of the transmission device 4 are operated by operating power from the power source circuit 20 for the multi-wave operation of the power source unit 18. It is operating with operating power from 62. Therefore, each terrestrial digital television broadcast signal received by the receiving antenna 6 is converted into an optical signal and transmitted to the transmission device 4, and is transmitted to the original by the transmission side single channel processing unit 42 and the transmission side multichannel processing unit 44. It is converted into each terrestrial digital television broadcast signal and retransmitted from the transmission antenna 58.

  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. . As a result, transmission of an optical signal obtained by converting a specific one-wave digital terrestrial television broadcast signal to the transmission device 4 is continued even if a power failure occurs.

  When a power failure has occurred on the transmission device 4 side, the supply of operating power from the power supply circuit for multi-wave operation 62 of the transmission-side power supply unit 60 is stopped, but the power supply circuit for single wave operation 70 automatically operates. As a result, the transmission side multi-channel processing unit 44 stops operating, but the transmission side single-channel processing unit 42 continues to operate. As a result, even if a power failure occurs, the transmission-side single channel processing unit 42 converts the transmitted optical signal into a specific one-wave digital terrestrial television broadcast signal and retransmits it from the transmission antenna 58.

  Therefore, even if a power failure occurs, retransmission of a specific one-wave television broadcast signal is continued. For example, even when a power outage occurs based on a disaster or the like, information on the disaster can be obtained by receiving a specific one-channel digital terrestrial television broadcast signal. In particular, digital terrestrial television broadcasting includes 1-segment broadcasting, so if you have a mobile device that has a 1-segment broadcasting reception function, for example, a mobile phone, you can send information about disasters anywhere in the area of retransmission. Available. In order to enable retransmission of a specific one-channel digital terrestrial television broadcast signal, the receiving device 2 backs up only the single channel processing unit 12-1 and the optical transmitter 14, and the transmitting device 4 Since only the single channel processing unit 42 is backed up, the internal batteries 24 and 64 used for backup can be used with a small capacity, and the cost can be reduced.

  When a power failure occurs only on the receiving device 2 side, the transmission of the optical signal of the specific one-channel digital terrestrial television broadcast signal from the receiving-side single channel processing unit 12-1 and the optical transmitter 14 is continued. On the transmission device 4 side, the transmission-side single channel processing unit 42 and the multi-channel processing unit 44 are operating, but a specific one-channel digital terrestrial television broadcast signal is retransmitted by the transmission-side single channel processing unit 42. . When a power failure occurs only on the transmitting device 4 side, all the optical signals of digital terrestrial television broadcast signals are transmitted from the receiving device 2 side to the transmitting device 4 side. Only the processing unit 42 operates, and a specific one-channel digital terrestrial television broadcast signal is retransmitted. Therefore, even when a power failure occurs only on one of the receiving device 2 and the transmitting device 4, the re-transmission of a specific one-channel digital terrestrial television broadcast signal is always continued.

  The preamplifier 8 is supplied with operating power from the multi-wave operation power supply circuit 20 of the reception-side power supply unit 18; however, when operating power is supplied from the single-wave operation power supply circuit 30 to the preamplifier 8 in the event of a power failure, the internal battery The capacity of 24 must be increased. Therefore, at the time of a power failure, the supply of operating power to the preamplifier 8 is stopped, and instead, the terrestrial digital television broadcast signal received by the receiving antenna 6 is supplied to the receiving device 2 as it is. Therefore, the reception signal at the reception antenna 6 is divided into two by the two distributors 76, and one distribution output is supplied to the preamplifier 8. The other distributed output and the output of the preamplifier 8 are combined by a combiner 78 and supplied to the receiver 2. Thus, in the state where the operating power is supplied from the power supply circuit for multi-wave operation 20 of the receiving-side power supply unit 18, the terrestrial digital television broadcast signal received by the receiving antenna 6 is divided into two by the two distributors 76. Is distributed by the preamplifier 8 and supplied to one of the combiners 78, and the other distributed output signal divided by the distributor 76 is supplied to the other of the combiners 78 as it is. From the output of 78, the amplified terrestrial digital television broadcast signal is transmitted to the head amplifier 10. In the state where the operating power is not supplied from the power supply circuit 20 for multi-wave operation of the receiving-side power supply unit 18, the other distributed output of the two distributor 76 is combined with the synthesizer for the terrestrial digital television broadcast signal received by the receiving antenna 6. The signal is transmitted to the head amplifier 10 via 78.

  Instead of the two distributors 76 and the combiner 78, first and second changeover switches that are automatically switched based on a power failure detection signal from the power failure detection circuit 26 in the event of a power failure are provided. The received signal is supplied to the preamplifier 8 by the first changeover switch, and the output of the preamplifier 8 is supplied to the receiving device 4 by the second changeover switch. In the event of a power failure, the received signal at the receiving antenna 6 is switched. The signal is supplied to the second changeover switch side by the changeover switch, and the reception signal of the reception antenna 6 supplied via the first changeover switch is supplied to the receiving device 4 by the second changeover switch changed from the preamplifier 8 side. It can also be configured to.

  In the above-described embodiment, the system can be configured by being attached to the receiving apparatus, the communication line facility, and the transmitting apparatus, for example, in addition to an optical joint receiving system or a joint receiving system using a coaxial cable. 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.

2 receiving device 4 transmitting device 12-1 to 12-n receiving side single channel processing unit 14 optical transmitter 16 optical transmitter 18 receiving side power supply unit 42 transmitting side single channel processing unit 44 transmitting side multichannel processing unit 60 transmitting side power source Part

Claims (5)

In a re-transmission system comprising a receiving device, a connecting line facility, and a transmitting device 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 equipment, and supplying the transmitting device to the transmitting device;
Receiving-side single-channel processing means for processing a specific single-channel terrestrial digital television broadcast signal to be able to be transmitted to the transmission device via the connection line equipment, and supplying the transmission device to the transmission device;
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
The transmitting device comprises:
A transmission-side multi-channel processing means for processing a signal from the reception-side multi-channel processing means transmitted from the receiving device via the communication line equipment so as to be received by a television receiver, and supplying the signal to a transmission antenna;
Transmitting-side single channel processing means for processing the signal from the receiving-side single channel processing means transmitted from the receiving device via the communication line equipment so as to be received by the television receiver, and supplying the signal to the transmitting antenna; ,
Operating power is supplied to the transmission-side multi-channel processing means and the single-channel processing means based on commercial power when the commercial power is supplied, and the transmission-side single-channel processing means is based on a battery when the commercial power is not supplied. A transmitter power supply for supplying operating power
Retransmission system provided.   2. The re-transmission system according to claim 1, wherein the receiving device is configured to receive a reception antenna for receiving each terrestrial digital television broadcast signal, distribution means for distributing the reception signal of the reception antenna into two, and supplying the commercial power. A pre-amplification unit that amplifies one distribution output of the distribution unit and enters a signal cutoff state when the commercial power supply is not supplied; the other distribution output of the distribution unit; and the output of the pre-amplification unit; A re-transmission system comprising: a receiving-side multiple channel processing means and a combining means for supplying an output to the receiving-side single channel processing means. A receiving-side multi-channel processing unit that processes and supplies a multi-channel digital terrestrial television broadcast signal to a transmitting device that re-transmits the signal through a communication line facility;
Receiving side single-channel processing unit for processing and supplying a specific one-channel digital terrestrial television broadcast signal different from the multiple-channel digital terrestrial television broadcast signal to the transmission device via the connection line facility When,
When commercial power is supplied, operating power is supplied to the receiving side multi-channel processing unit and the receiving side single channel processing unit based on commercial power, and when the commercial power is not supplied, the receiving side single channel processing unit is connected to the battery. A receiving-side power supply that supplies operating power based on
A receiving apparatus for a retransmission system. A transmission-side multi-channel processing unit that processes the transmitted multi-channel digital terrestrial television broadcast signal and supplies it to the transmission antenna;
A transmission-side single channel processing unit that processes a specific one-channel digital terrestrial television broadcast signal and supplies the signal to the transmission antenna;
When the commercial power is supplied, operating power is supplied to the transmission-side multi-channel processing unit and the single-channel processing unit based on the commercial power, and when the commercial power is not supplied, the transmission-side single-channel broadcast processing unit is connected to the battery. A transmission-side power supply that supplies operating power based on
A transmission apparatus for a retransmission system. 4. The retransmission system according to claim 1, or the receiving apparatus for a retransmission system according to claim 3, wherein the communication line equipment is an optical communication line equipment, and the reception side multi-channel processing means and the reception side single channel processing means. Is a re-transmission system or a re-transmission system receiver that multiplexes optical signals of different wavelengths and transmits them to the transmitter via the optical communication line equipment.

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