JP5048566B2 - Television broadcast retransmission system and monitoring device - Google Patents

Description

  The present invention relates to a television broadcast re-transmission system that receives a television broadcast radio wave, transmits the received signal to a transmission antenna installed in a difficult viewing area where the television broadcast radio wave does not reach, and retransmits the television broadcast radio wave.

  As a system that distributes TV broadcast signals in difficult viewing areas where the TV broadcast waves transmitted from the broadcast station do not reach, install a receive antenna in a place where the TV broadcast waves from the broadcast station can be received, and receive from the receive antenna By amplifying the signal with an amplifier and transmitting it to a transmission antenna installed in each part of the difficult viewing area via a transmission line (such as a coaxial cable) wired in the difficult viewing area, the broadcast from the transmitting antenna A television broadcast re-transmission system that re-transmits radio waves is known (see, for example, Patent Document 1).

In this type of system, if the quality of a television broadcast signal to be retransmitted is poor, unnecessary interference may be given to nearby television receivers. Therefore, conventionally, a reliable television broadcast signal received by a receiving antenna is selected for each broadcast channel, the signal quality is detected, and if there is a poor quality television broadcast signal, the broadcast channel is transmitted. It has also been proposed to prevent passage to the antenna side (see, for example, Patent Document 2).
JP 2004-48141 A JP 2006-287342 A

  By the way, in the system for retransmitting a television broadcast signal as described above, since the reception antenna and the transmission antenna are installed in different places, the television broadcast signal to be retransmitted usually at the reception point where the reception antenna is installed. Is processed for each broadcast channel, the signal level is set to an appropriate level, the TV broadcast signal after the level setting is mixed, and transmitted to the transmission point where the transmission antenna is installed. The transmitted television broadcast signal is amplified and output to the transmitting antenna.

  The TV broadcast signal received by the receiving antenna is transmitted to the signal processing circuit used for processing the TV broadcast signal for each broadcast channel at the reception point, the transmission path from the reception point to the transmission point, and the transmission point. When passing through an amplifier circuit or the like used to amplify a broadcast signal, the signal level or signal quality may be lowered due to a failure of each circuit.

  However, the proposed system is configured to detect the signal quality of a re-transmission television broadcast signal received by the receiving antenna and transmit it to the transmitting antenna side if the signal quality is normal. Therefore, even if the signal level or signal quality of the television broadcast signal decreases in the transmission path of the television broadcast signal from the reception antenna to the transmission antenna, the television broadcast signal is retransmitted from the transmission antenna. It was not possible to limit the TV broadcast signal retransmitted from the one to the signal level and signal quality appropriate.

  The present invention has been made in view of these problems, and is a television broadcast retransmission system that receives a television broadcast radio wave and retransmits the received signal from a transmission antenna installed in a difficult viewing area where the television broadcast radio wave does not reach. An object of the present invention is to monitor the signal level or signal quality of a television broadcast signal retransmitted from a transmission antenna for each broadcast channel so that the television broadcast signal retransmitted from the transmission antenna can be limited to an appropriate one. To do.

In order to achieve this object, the invention according to claim 1 is directed to signal processing of a television broadcast signal received by a receiving antenna for each broadcast channel, and mixing and outputting the television broadcast signal after the signal processing. A broadcast signal processing device, and a transmission device that is installed in a hard-to-view area where television broadcast radio waves do not reach and amplifies the television broadcast signal output from the broadcast signal processing device and retransmits the signal from the transmission antenna. A television broadcast retransmission system,
The broadcast signal processing device includes wave number signal output means for generating a wave number signal representing the wave number of a television broadcast signal output from the broadcast signal processing device and outputting the wave number signal together with the television broadcast signal.
The transmission device comprises: a wave number detection means for detecting a wave number of a television broadcast signal output from the broadcast signal processing device from a wave number signal output from the broadcast signal processing device together with the television broadcast signal; and retransmission from the transmission antenna. Selecting a television broadcast signal of a predetermined broadcast channel from the television broadcast signals to be selected, detecting a signal level or signal quality of the television broadcast signal, and a broadcast channel to be selected by the channel selection means in advance. By sequentially switching to one of a plurality of registered retransmission channels, the channel selection unit acquires the signal level or signal quality of the television broadcast signal for each retransmission channel, and the acquired signal level or Signal state determination means for determining whether the signal quality is normal, and the signal level or signal quality is normal by the signal state determination means It is determined whether or not the wave number of the retransmission channel determined to be coincident with the wave number detected by the wave number detecting means. If the wave numbers do not match, the transmitting apparatus retransmits. An abnormality determining means for determining that there is an abnormality in the TV broadcast signal and notifying the fact is provided.

  The invention according to claim 2 is the television broadcast re-transmission system according to claim 1, wherein when the abnormality determining means determines that the television broadcast signal retransmitted by the transmitter is abnormal, the transmission The output of the television broadcast signal to the antenna is stopped.

  The invention according to claim 3 is the television broadcast re-transmission system according to claim 1, wherein when the abnormality determining means determines that the television broadcast signal retransmitted by the transmitter is abnormal, The signal processing device is characterized in that the output of the television broadcast signal of the retransmission channel determined to be abnormal by the signal state determination means is stopped.

  Furthermore, the invention according to claim 4 is the television broadcast retransmission system according to any one of claims 1 to 3, wherein the channel selection means, the signal state acquisition means, and the abnormality determination means are The transmission device is provided separately from the transmission device, and is provided in a monitoring device that can be attached to the transmission device.

On the other hand, according to the fifth aspect of the present invention, the television broadcast signal received by the receiving antenna is signal-processed for each broadcast channel, the television broadcast signal after the signal processing is mixed and output, and the mixed television A broadcast signal processing device that generates and outputs a wave number signal representing the wave number of the broadcast signal, and is installed in a difficult viewing area where the television broadcast radio wave does not reach, amplifies the television broadcast signal output from the broadcast signal processing device, In a television broadcast retransmission system comprising: a transmission device that retransmits from a transmission antenna and detects a wave number of a television broadcast signal output from the broadcast signal processing device from a wave number signal output from the broadcast signal processing device A monitoring device for monitoring whether a television broadcast signal retransmitted from the transmission device is normal,
A channel selection means for selecting a television broadcast signal of a predetermined broadcast channel from among the television broadcast signals to be retransmitted from the transmission antenna and detecting the signal level or signal quality of the television broadcast signal; By sequentially switching the broadcasting channel to be stationed to one of a plurality of retransmission channels registered in advance, the signal level or signal quality of the television broadcast signal is acquired for each retransmission channel from the channel selection means, Signal state determination means for determining whether or not the acquired signal level or signal quality is normal, the wave number of the retransmission channel determined by the signal state determination means to be normal, and It is determined whether or not the wave numbers detected by the wave number detecting means match, and if the wave numbers do not match, the transmitting device retransmits the data. It is determined that there is an abnormality in the bi broadcast signal, characterized by comprising an abnormality judging means for notifying to that effect, the.

  Further, the invention according to claim 6 is the monitoring device according to claim 5, wherein when the abnormality determination unit determines that there is an abnormality in the television broadcast signal retransmitted by the transmission device, the transmission device The output of the television broadcast signal to the transmission antenna is stopped.

  The invention according to claim 7 is the monitoring apparatus according to claim 5, wherein when the abnormality determining means determines that the television broadcast signal retransmitted by the transmitting apparatus is abnormal, the broadcast signal processing apparatus On the other hand, the output of the television broadcast signal of the retransmission channel determined to be abnormal by the signal state determination means is stopped.

  In the television broadcast re-transmission system according to claim 1, the broadcast signal processing device performs signal processing for each broadcast channel on the television broadcast signal received by the receiving antenna, and mixes the television broadcast signal after the signal processing. The transmission apparatus amplifies the television broadcast signal output from the broadcast signal processing apparatus and retransmits it from the transmission antenna.

  The broadcast signal processing apparatus is provided with wave number signal output means. The wave number signal output means generates a wave number signal representing the wave number of the television broadcast signal output from the broadcast signal processing apparatus and outputs the wave number signal together with the television broadcast signal.

  In other words, the broadcast signal processing apparatus extracts each of the broadcast signals of the broadcast channel (that is, the retransmission channel) set as the television broadcast signal to be retransmitted in advance from the reception signal from the reception antenna, and the signal level thereof is extracted. The signal processing such as adjustment of the signal is performed, and the TV broadcast signals of all the broadcast channels after the signal processing are mixed and output. However, the TV broadcast radio wave may be stopped for the maintenance of the broadcasting equipment. In this case, it is not possible to output TV broadcast signals of all channels set as retransmission channels. Therefore, in the present invention, wave number signal output means is provided in the broadcast signal processing apparatus so as to notify the transmitting apparatus side of the wave number of the television broadcast signal currently being mixed and output.

  On the other hand, the transmission device includes a wave number detection means for detecting the wave number of the television broadcast signal output from the broadcast signal processing device from the wave number signal output from the broadcast signal processing device together with the television broadcast signal, and a television that is retransmitted from the transmission antenna. Channel selection means is provided for selecting a television broadcast signal of a predetermined broadcast channel from the broadcast signals and detecting the signal level or signal quality of the television broadcast signal.

  Then, in the transmission device, the signal state determination unit sequentially switches the broadcast channel selected by the channel selection unit to one of a plurality of retransmission channels registered in advance. In addition, the signal level or signal quality of the television broadcast signal is respectively acquired, it is determined whether or not the acquired signal level or signal quality is normal, and the abnormality determination means determines whether the signal level or signal quality is the signal state determination means. It is determined whether or not the wave number of the retransmission channel determined to be normal matches the wave number detected by the wave number detection means, and if the wave number does not match, the transmitting apparatus retransmits. Judge that there is an abnormality in the TV broadcast signal, and notify that fact.

That is, when the above wave numbers match, the TV broadcast signal retransmitted from the transmission antenna matches the TV broadcast signal output from the broadcast signal processing device, and all the TV broadcast signals are Since it can be determined that the signal level or the signal quality is normal, the abnormality determination unit determines that the television broadcast signal retransmitted by the transmission apparatus is normal.

  On the other hand, if the above wave numbers do not match, it can be determined that there is an abnormality in any of the blue TV broadcast signals output from the broadcast signal processing device, and normal retransmission cannot be performed. The means determines that there is an abnormality in the television broadcast signal retransmitted by the transmission apparatus, and notifies that fact.

  Therefore, according to the television broadcast re-transmission system of the present invention, some abnormality (equipment failure / malfunction, intrusion of interference wave, etc.) occurs in the transmission system of the television broadcast signal from the reception antenna to the transmission antenna. If at least one of the TV broadcast signals to be transmitted has an abnormality in the signal level or signal quality, this is accurately detected and notified to the administrator, etc., and the retransmission of the abnormal TV broadcast signal is stopped. Can be made.

  In addition, when the abnormality determination unit determines that there is an abnormality in the television broadcast signal to be retransmitted by the transmission device, the abnormality determination unit does not simply notify the abnormality, but as described in claim 2, as described in claim 2, If the configuration is such that the output of the TV broadcast signal is stopped, it is possible to more reliably prevent the abnormal TV broadcast signal from being retransmitted. Can be more reliably prevented.

  In addition, the transmission device and the broadcast signal processing device are arranged close to each other or integrally configured, or the transmission device and the broadcast signal processing device can perform two-way communication. When the command signal can be transmitted directly, the abnormality determination means transmits the command signal to the broadcast signal processing device when it is determined that there is an abnormality in the television broadcast signal retransmitted by the transmission device. Thus, the output of the television broadcast signal of the retransmission channel determined to be abnormal by the signal state determination unit may be stopped.

  In this way, only the television broadcast signal that is abnormal in the signal level or signal quality and may interfere with the nearby television receiver is stopped, and the normal television broadcast signal is retransmitted. Transmission can be continued.

  The abnormality determination means notifies the abnormality at the time of abnormality determination, and the abnormality notification may notify the administrator of the abnormality by lighting an alarm lamp, generating an alarm sound, etc. However, in a general system that is operated unattended, a radio communication terminal such as a mobile phone is provided in the abnormality determination means, and the administrator is notified of the abnormality using the radio communication terminal.

  Next, the channel selection unit, the signal state acquisition unit, and the abnormality determination unit are provided in a monitoring device configured separately from the transmission device, as described in claim 4, and the monitoring device is provided in the transmission device. It may be possible to monitor normality / abnormality of a television broadcast signal retransmitted from the transmission device.

  When the monitoring device is configured separately as described above, the normality / abnormality of the television broadcast signal output from the broadcast signal processing device can be monitored by mounting the monitoring device on the broadcast signal processing device. become.

  Next, the invention described in claims 5 to 7 is an invention relating to a monitoring device configured separately from the transmission device in this way, and the monitoring device described in claim 5 is described in claim 1. The monitoring apparatus according to claim 6 is configured in the same manner as that according to claim 2, and the monitoring apparatus according to claim 6 is configured similarly to that according to claim 2. In this monitoring apparatus, the abnormality determination means is configured in the same manner as in the third aspect.

  For this reason, according to the monitoring apparatus of Claim 5-Claim 7, the effect similar to Claim 1-Claim 3 mentioned above, respectively can be acquired. In addition, by attaching this monitoring apparatus to the broadcast signal processing apparatus, it is possible to monitor normality / abnormality of the television broadcast signal output from the broadcast signal processing apparatus.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a system configuration diagram showing the overall configuration of a television broadcast retransmission system to which the present invention is applied.

  The television broadcast re-transmission system of the present embodiment is difficult to receive directly from the terrestrial digital broadcasting television broadcast radio waves distributed from the television broadcast station in the UHF band due to the terrain or building being blocked. This is for retransmitting TV broadcast waves within the viewing area.

  As shown in FIG. 1, the television broadcast re-transmission system includes a receiving antenna 2 installed in a place where a television broadcasting radio wave (hereinafter simply referred to as a broadcasting radio wave) transmitted from a broadcasting station can be received, The head end 4 as a broadcast signal processing device that processes the received signal and sends it to the transmission line 6, installed in the difficult viewing area to be retransmitted, and transmitted from the head end 4 via the transmission line 6 A transmission device 8 that retransmits a television broadcast signal via the transmission antenna 9 and a monitor that monitors whether the television broadcast signal that is attached to the transmission device 8 and retransmitted from the transmission antenna 9 is normal for each broadcast channel. The apparatus 10 is comprised.

  The transmission line 6 is used to transmit various broadcast signals output from the head end 4 to the terminal-side transmission device 8 as in a general CATV system. In this embodiment, the transmission line 6 is a coaxial cable. It is configured. The transmission line 6 is provided with various transmission devices such as a reception signal amplification amplifier 5 and a reception signal splitter branching unit 7 so that various broadcast signals can be transmitted to the terminal side without deterioration. .

  As shown in FIG. 2, the head end 4 receives an amplification circuit 12 that amplifies the reception signal from the reception antenna 2, and the amplified reception signal is received by the reception antenna 2 at the installation location of the head end 4. A distribution circuit 14 that distributes the number of possible TV broadcast signal channels (wave numbers), and a TV broadcast signal of each broadcast channel that can be received by the receiving antenna 2 from among the reception signals distributed by the distribution circuit 14. A plurality of channel processors 20 that respectively extract and process the extracted television broadcast signals and set the signal level to an appropriate level, and the television broadcast signals of each broadcast channel that have been signal processed by each channel processor 20 are mixed. A mixing circuit 16 that performs the above-described operation and an amplifier circuit 18 that amplifies the television broadcast signal mixed by the mixing circuit 16 are provided.

  Here, the channel processor 20 is supplied with a band-pass filter (hereinafter referred to as BPF) 22 for selectively passing a television broadcast signal of a specific broadcast channel to be processed, and a television broadcast signal that has passed through the BPF 22. A television broadcast signal (received signal) that has passed through the processor unit 24 to be processed and the BPF 22 is taken in via the branch circuit 26, and the presence / absence of a television broadcast signal (that is, a television broadcast of a specific broadcast channel is made based on the signal level). Or a stoppage determination unit 28 for stopping the operation of the processor unit 24 when the stoppage is made.

Therefore, each channel processor 20 processes the television broadcast signal when the reception signal input via the distribution circuit 14 includes a television broadcast signal of a specific broadcast channel to be processed. However, when the received signal does not contain the TV broadcast signal to be processed (that is, when it is stopped), the operation is stopped by the so-called squelch function, This prevents output of unnecessary signals.

  Then, the head end 4 captures the determination result from the wave stop determination unit 28 of each channel processor 20, so that the number of channels of the television broadcast signal that is actually received by the receiving antenna 2 and actually output from the head end 4. A wave number data generation circuit 30 for detecting (wave number) and generating the wave number data is provided.

  The wave number data generated by the wave number data generation circuit 30 is input to the FSK modulation circuit 32 and used to generate a wave number signal by FSK modulation of the high frequency signal generated by the oscillator 34. The The oscillator 34 is a high-frequency signal having a frequency different from that of the television broadcast signal output from the headend 4 (more specifically, a frequency lower than the UHF television broadcast frequency band that can be received by the receiving antenna 2). High frequency signal) as a carrier wave for wave number data transmission.

  The wave number signal generated by the FSK modulation circuit 32 is input to the mixing circuit 36 and mixed with the television broadcast signal of each broadcast channel amplified by the amplifier circuit 18. Each signal mixed by the mixing circuit 36 is further amplified by the amplification circuit 37 and sent to the transmission line 6 via the output circuit 38 composed of a lightning protection element, a filter and the like.

  Next, the transmitter 8 includes an amplifier circuit 42 that amplifies a received signal (specifically, a television broadcast signal + wave number signal) transmitted from the head end 4 via the transmission line 6, and the amplifier circuit 42 A variable attenuator 44 for attenuating the amplified received signal, an amplifying circuit 46 for the received signal attenuated by the variable attenuator 44, and a television broadcast signal for each broadcast channel among the received signals amplified by the amplifying circuit 46 A high-pass filter (hereinafter referred to as HPF) 48 that passes only the signal is provided, and a television broadcast signal of each broadcast channel that has passed through the HPF 48 is output to the transmission antenna 9 as a retransmission signal.

  That is, the transmission device 8 is configured as an amplifying device capable of gain adjustment by the amplification circuit 42 on the signal input side, the variable attenuator 44, and the amplification circuit 46 on the signal output side, and the variable attenuator 44 is used. By adjusting the gain, the signal level of the television broadcast signal output to the transmission antenna 9 (in other words, the transmission power of the television broadcast signal from the transmission antenna 9) can be set.

  In addition, the transmission device 8 includes a low-pass filter (hereinafter referred to as LPF) 50 that passes only a wave number signal having a frequency lower than that of the television broadcast signal of each broadcast channel among the reception signals amplified by the amplifier circuit 46. Is provided.

  The wave number signal that has passed through the LPF 50 is input to the FSK demodulation circuit 54 via the BPF 52 for removing noise components, and the wave number data is restored by the FSK demodulation circuit 54. The wave number data restored by the FSK demodulating circuit 54 is input to a control circuit 60 composed of a microcomputer.

  Further, the transmitter 8 retransmits by branching a part of the retransmission signal that has passed through the HPF 48 and detecting the retransmission signal branched by the branch circuit 56 in the entire frequency band. A detection circuit 58 for detecting total power for all signal broadcast channels is provided, and a detection voltage output from the detection circuit 58 is also input to the control circuit 60.

  Then, the control circuit 60 sets the target power (specifically, the target detection voltage) for all the retransmitted signal broadcast channels in accordance with the wave number data input from the FSK demodulation circuit 54, and the total power detected by the detection circuit 58. By controlling the gain adjustment circuit 62 so that (detection voltage) becomes the target power (target detection voltage), the amount of attenuation of the variable attenuator 44 (that is, the television in the transmission device 8) is controlled via the gain adjustment circuit 62. (Broadcast signal amplification gain) is controlled.

  That is, since the total power (detection voltage) of the retransmission signal detected by the detection circuit 58 increases as the number of channels (wave number) of the television broadcast signal transmitted from the head end 4 increases, the control circuit 60 Based on the wave number data demodulated by the FSK demodulating circuit 54, the target power (target detection voltage) is set to increase as the wave number of the television broadcast signal included in the retransmission signal increases.

  Further, the control circuit 60 is capable of data communication with the monitoring device 10, outputs the wave number data input from the FSK demodulation circuit 54 to the monitoring device 10, and issues a retransmission stop command from the monitoring device 10. When the power is received, the power cut-off circuit 64 is driven to cut off the power supply to the amplifier circuits 42 and 46.

  The transmission device 8 is provided with a branch circuit 66 that branches a part of the retransmission signal that has passed through the branch circuit 56. The retransmission signal branched by the branch circuit 66 is sent to the monitoring device 10. Is output.

  Next, the monitoring device 10 includes a control circuit 70 capable of data communication with the control circuit 60 of the transmission device 8, and a television broadcast of a predetermined broadcast channel from among retransmission signals input from the monitoring device 10. A tuner module 72 capable of selecting a signal and detecting a modulation error ratio (MER) indicating the signal level of the selected television broadcast signal and the signal quality of the television broadcast signal; And a wireless communication module 74 for notifying the administrator of the television broadcast retransmission system via the wireless communication line of the monitoring state.

  The control circuit 70 is configured by a microcomputer, and a retransmission signal (specifically, a retransmission signal) output from the transmission device 8 to the transmission antenna 9 by repeatedly executing the retransmission monitoring process shown in FIG. All of the plurality of television broadcast signals constituting the signal are monitored and if an abnormality of the retransmission signal is detected, a retransmission stop command is output to the control circuit 60 of the transmission device 8 and the transmission antenna 9 Is stopped, and the abnormality detection result is notified to the administrator via the wireless communication module 74.

Hereinafter, the retransmission monitoring process executed by the control circuit 70 will be described.
As shown in FIG. 4, in the retransmission monitoring process, first, in S110 (S represents a step), the wave number data is acquired from the transmission device 8 and the wave number counter is initialized to a value of zero.

  Next, in S120, the tuner module 72 is tuned to one of the re-transmission channels by transmitting a channel selection command for selecting one of a plurality of pre-registered re-transmission channels. The signal level and MER of the television broadcast signal of the retransmission channel are obtained from the module 72.

  A plurality of re-transmission channels registered in advance are all broadcast channels of TV broadcast signals individually processed by the channel processors 20 provided in the head end 4 and are registered in advance in the memory in the control circuit 70. Has been.

In subsequent S130, it is determined whether or not each of these parameters is normal by comparing the signal level and MER of the retransmission channel acquired in S120 with a preset abnormality determination value. If both parameters are normal, the wave number counter is incremented (+1) in S140, and the process proceeds to S150. If one or both of these parameters are abnormal, the process proceeds to S150.

  In S150, the process of S120 is repeatedly executed to select all of a plurality of pre-registered retransmission channels, acquire the signal level and MER of the retransmission channel, and execute the determination process of S130 Determine whether or not.

  If channel selection and determination of all retransmission channels are not completed, the process proceeds to S120, and a channel selection command for a retransmission channel that has not yet been selected and determined among a plurality of retransmission channels. By outputting to the tuner module, the processes of S120 to S150 are repeatedly executed until the selection and determination of all retransmission channels are completed.

  On the other hand, if it is determined in S150 that the selection and determination of all the retransmission channels have been completed by repeatedly executing the processes of S120 to S150, the process proceeds to S160, and the value of the wave number counter and S110 are determined. It is determined whether or not the value of the wave number data acquired in step 1 matches.

  If these values match, it is determined that the retransmission signal (specifically, all of the plurality of television broadcast signals constituting the retransmission signal) output from the transmission device 8 to the transmission antenna 9 is normal. Then, the process proceeds to S110, the above-described series of processing from S110 is executed again, and conversely, if the above values do not match, the retransmit signal output from the transmission device 8 to the transmission antenna 9 (more details It is determined that at least one of a plurality of television broadcast signals constituting the transmission signal is abnormal, and the process proceeds to S170.

  In S170, a retransmission stop command is output to the control circuit 60 of the transmission device 8 to cut off the power supply to the amplification circuits 42 and 46 in the transmission device 8, and the television broadcast signal from the transmission antenna 9 is transmitted. Is stopped and the process proceeds to S180.

  In S180, there is an abnormality in any of the television broadcast signals output from the transmission device 8 to the transmission antenna 9 (in other words, the TV broadcast signal output from the head end 4 to the transmission line is retransmitted). To the administrator via the wireless communication module 74, and the retransmission monitoring process is terminated.

  As described above, in the television broadcast re-transmission system of the present embodiment, not only the retransmission-reliable television broadcast signal is output from the head end 4 to the transmission device 8 side, but also the wave number of the television broadcast signal is represented. A wave number signal is also output, and on the transmitting device 8 side, the wave number of the television broadcast signal output from the head end 4 is detected from the wave number signal, and the total power of all television broadcast signals to be retransmitted from the transmission antenna 9 is determined according to the wave number. Control.

  Further, the transmission device 8 to the monitoring device 10 transmit wave number data representing the wave number of the television broadcast signal output from the head end 4 and the television broadcast signal (retransmission) of each broadcast channel output from the transmission device 8 to the transmission antenna 9. Signal) is output.

On the monitoring device 10 side, the control circuit 70 causes the tuner module 72 to sequentially select one of a plurality of pre-registered retransmission channels from the retransmission signals input from the transmission device 8. Then, the signal level and MER are acquired for each retransmission channel, and if these parameters are both normal, the wave number counter is counted up so that the transmission apparatus 8 retransmits from the transmission antenna 9. The wave number of the signal is counted, and if the counted wave number matches the wave number data from the head end 4, it is determined that all the television broadcast signals transmitted from the transmitting antenna 9 by the transmitting device 8 are normal and counted. If the wave number does not match the wave number data from the head end 4, the TV broadcast signal transmitted from the transmission antenna 9 by the transmission device 8 is transmitted. Or to be determined as being defective Re, stops the output of the television broadcast signal from the transmitter 8 to the transmitting antenna 9.

  For this reason, according to the television broadcast re-transmission system of the present embodiment, some abnormality occurs in the transmission system of the television broadcast signal from the receiving antenna 2 to the transmitting antenna 9 (device failure / malfunction, intrusion of interference wave, etc.) When at least one of the television broadcast signals retransmitted from the transmission antenna 9 has an abnormality in the signal level or signal quality, the fact is detected accurately and the retransmission of the abnormal television broadcast signal is stopped. Can do.

  Therefore, according to this embodiment, it is possible to prevent an abnormal television broadcast signal from being retransmitted from the transmission antenna 9, and to prevent a nearby television receiver from being disturbed by the abnormal television broadcast signal.

  In this embodiment, the head end 4 corresponds to the broadcast signal processing apparatus of the present invention, and the wave number data generation circuit 30 and the FSK modulation circuit 32 in the head end 4 correspond to the wave number signal output means of the present invention. The FSK demodulating circuit 54 in the transmitter 8 corresponds to the wave number detecting means of the present invention.

  In the present embodiment, the tuner module 72 provided in the monitoring device 10 corresponds to the channel selection unit of the present invention, and the processing of S120 to S150 in the retransmission monitoring processing executed by the control circuit 70 is the main processing unit. The process corresponds to the signal state determination unit of the invention, and the processes of S160 to S180 in the retransmission monitoring process correspond to the abnormality determination unit of the present invention.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various aspect can be taken in the range which does not deviate from the summary of this invention.
For example, in the above embodiment, when the monitoring device 10 determines that the retransmission signal output from the transmission device 8 to the transmission antenna 9 is abnormal, the monitoring device 10 outputs the retransmission signal from the transmission device 8 to the transmission antenna 9. Although described as being stopped, in this case, transmission of a television broadcast signal of a broadcast channel for which both the signal level and the MER are determined to be normal in the retransmission monitoring process is also stopped.

  For this reason, if the transmission device 8 and the head end 4 are closely arranged or integrally configured, or the television broadcast retransmission system is configured so that the transmission device 8 and the head end 4 can perform bidirectional communication, At S170 of the retransmission monitoring process shown in FIG. 4, instead of outputting a retransmission stop command, it is determined that at least one of the signal level and the MER is abnormal in S130 for the head end 4. You may make it output the stop instruction | command which stops the output of a broadcast channel (specifically operation | movement of the channel processor 20 which performs signal processing of the television broadcast signal of the broadcast channel).

  In other words, in this way, only the television broadcast signal that has an abnormality in the signal level or signal quality and may interfere with the neighboring television receiver is stopped, and the normal television broadcast signal is retransmitted. Transmission can be continued.

On the other hand, in the above-described embodiment, the monitoring device 10 that performs abnormality determination on the retransmission signal output from the transmission device 8 to the transmission antenna 9 has been described as being configured separately from the transmission device 8. 10 may be incorporated in the transmission device 8, and the monitoring device 10 may be integrated with the transmission device 8.

  Further, in the above embodiment, the tuner module 72 as the channel selection means can detect the signal level of the selected television broadcast signal and the MER indicating the signal quality of the television broadcast signal. Although it has been described that the normal / abnormality of the television broadcast signal is determined by determining whether the parameter is normal or not, the tuner module 72 can detect either the signal level or the signal quality. The present invention can be applied similarly to the above embodiment. That is, in this case, the normality / abnormality of the television broadcast signal may be determined based on the signal level or signal quality detected by the tuner module 72 in the retransmission monitoring process.

  In addition, as a parameter representing the signal quality of a television broadcast signal, a parameter other than MER such as a bit error rate (BER) can be used, and each broadcast channel can be obtained using both MER and BER. You may make it perform abnormality determination of a television broadcast signal for every.

It is a block diagram showing the structure of the whole television broadcast re-transmission system of embodiment. It is a block diagram showing the structure of a head end. It is a block diagram showing the structure of a transmitter and a monitoring apparatus. It is a flowchart showing the retransmission monitoring process performed with the control circuit of a monitoring apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 2 ... Reception antenna, 4 ... Head end, 5 ... Amplifier, 6 ... Transmission line, 8 ... Transmission device, 9 ... Transmission antenna, 10 ... Monitoring device, 12 ... Amplifier circuit, 14 ... Distribution circuit, 16 ... Mixing circuit, 18 Amplifying circuit, 20 Channel processor, 22 BPF, 24 Processor unit, 26 Branch circuit, 28 Stopping wave determination unit, 30 Wave number data generating circuit, 32 FSK modulation circuit, 34 Oscillator, 36 Mixing Circuit: 37 ... Amplification circuit, 38 ... Output circuit, 42 ... Amplification circuit, 44 ... Variable attenuator, 46 ... Amplification circuit, 48 ... HPF, 50 ... LPF, 52 ... BPF, 54 ... FSK demodulation circuit, 56 ... Branch circuit 58 ... detection circuit, 60 ... control circuit, 62 ... gain adjustment circuit, 64 ... power cutoff circuit, 66 ... branch circuit, 70 ... control circuit, 72 ... tuner module, 74 ... wireless communication module .

Claims (7)

A broadcast signal processing apparatus that performs signal processing for each broadcast channel on a television broadcast signal received by a receiving antenna, and mixes and outputs the television broadcast signal after the signal processing;
A transmission device that is installed in a difficult viewing area where the television broadcast wave does not reach, amplifies the television broadcast signal output from the broadcast signal processing device, and retransmits from the transmission antenna;
A television broadcast retransmission system comprising:
The broadcast signal processing device includes:
Wave number signal output means for generating a wave number signal representing the wave number of a television broadcast signal output by the broadcast signal processing apparatus and outputting the wave number signal together with the television broadcast signal;
The transmitter is
Wave number detection means for detecting the wave number of the television broadcast signal output from the broadcast signal processing apparatus from the wave number signal output together with the television broadcast signal from the broadcast signal processing apparatus;
Channel selection means for selecting a television broadcast signal of a predetermined broadcast channel from among the television broadcast signals to be retransmitted from the transmission antenna, and detecting a signal level or signal quality of the television broadcast signal;
By sequentially switching the broadcast channel selected by the channel selection means to one of a plurality of re-transmission channels registered in advance, the signal level or signal of the TV broadcast signal is transmitted from the channel selection means for each retransmission channel. Signal state determination means for acquiring each quality and determining whether the acquired signal level or signal quality is normal;
It is determined whether or not the wave number of the retransmission channel determined to have a normal signal level or signal quality by the signal state determination unit and the wave number detected by the wave number detection unit, and the wave number is If they do not match, it is determined that there is an abnormality in the television broadcast signal that is retransmitted by the transmission device, and an abnormality determination unit that notifies the fact,
A television broadcast re-transmission system comprising:   2. The television broadcast according to claim 1, wherein the abnormality determination unit stops the output of the television broadcast signal to the transmission antenna when determining that the television broadcast signal retransmitted by the transmission apparatus is abnormal. Retransmission system.   When the abnormality determining means determines that there is an abnormality in the television broadcast signal retransmitted by the transmitting apparatus, the broadcast signal processing apparatus determines that the broadcast signal processing apparatus determines that the broadcast condition is determined abnormal by the signal state determining means. The television broadcast re-transmission system according to claim 1, wherein output of the signal is stopped. The channel selection unit, the signal state acquisition unit, and the abnormality determination unit are:
The television broadcast retransmission system according to any one of claims 1 to 3, wherein the television broadcast retransmission system is configured separately from the transmission device and is provided in a monitoring device that can be attached to the transmission device. The TV broadcast signal received by the receiving antenna is processed for each broadcast channel, and the TV broadcast signal after the signal processing is mixed and output, and a wave number signal representing the wave number of the mixed TV broadcast signal is generated. Broadcast signal processing apparatus for outputting
Installed in a hard-to-view area where television broadcast waves do not reach, amplify the television broadcast signal output from the broadcast signal processing device, retransmit from the transmission antenna, and from the wave number signal output from the broadcast signal processing device A transmission device for detecting a wave number of a television broadcast signal output by the broadcast signal processing device;
A television broadcast retransmission system comprising: a monitoring device that monitors whether a television broadcast signal retransmitted from the transmission device is normal;
Channel selection means for selecting a television broadcast signal of a predetermined broadcast channel from among the television broadcast signals to be retransmitted from the transmission antenna, and detecting a signal level or signal quality of the television broadcast signal;
By sequentially switching the broadcast channel selected by the channel selection means to one of a plurality of re-transmission channels registered in advance, the signal level or signal of the TV broadcast signal is transmitted from the channel selection means for each retransmission channel. Signal state determination means for acquiring each quality and determining whether the acquired signal level or signal quality is normal;
It is determined whether or not the wave number of the retransmission channel determined to have a normal signal level or signal quality by the signal state determination unit and the wave number detected by the wave number detection unit, and the wave number is If they do not match, it is determined that there is an abnormality in the television broadcast signal retransmitted by the transmission device, and abnormality determination means for notifying that effect,
A monitoring device comprising:   The abnormality determination unit, when determining that there is an abnormality in a television broadcast signal retransmitted by the transmission device, causes the transmission device to stop outputting the television broadcast signal to the transmission antenna. 5. The monitoring device according to 5.   When the abnormality determining means determines that there is an abnormality in the television broadcast signal retransmitted by the transmitting apparatus, the broadcast signal processing apparatus determines that the broadcast signal processing apparatus determines that the broadcast condition is determined abnormal by the signal state determining means. 6. The monitoring apparatus according to claim 5, wherein output of the signal is stopped.

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