JP5977985B2 - Wireless transmission system for video signal relay and transmitter or receiver thereof - Google Patents

Description

The present invention is suitable for outdoor relay Film image signals digitally radio transmission system for relaying a video signal, and to their transmitter or receiver.

In recent years, digital signals are generally used for video signal transmission. For this reason, multi-value digital modulation such as QAM (Quadrature Amplitude Modulation) method and OFDM (Orthogonal Frequency Division Multiplexing) method has been used. Transmission by method is widely used.
And, according to a transmission system called FPU (Field Pickup Unit) using this, stable relay transmission can be easily maintained even if radio wave propagation conditions change considerably, so that it can be used for outdoor broadcasting of television broadcasting. Conventionally, it has been heavily used as a suitable system.

By the way, in the case of a transmission system used for relaying such a digital video signal, generally a transmission side device and a reception side device are connected via a desired transmission system, for example, a wireless transmission system. Sometimes it is desirable to be able to quickly respond to the occurrence of an abnormality from the standpoint of maintaining reliability. For this purpose, it is necessary to constantly monitor the operation of the system.
Therefore, conventionally, a system is known in which the operation of the transmission side device and the reception side device is constantly monitored.

Here, FIG. 6A is a block diagram in which an example of a wireless transmission system used for relaying video data is illustrated. In this case, the transmitter T is disposed on the transmission side of the relay path, and the receiver R is Located on the receiving side.
Then, the transmitter T places video data to be wirelessly relayed on a carrier wave having a frequency in the microwave band, for example, and transmits it as a radio wave from the antenna. The receiver R receives the radio wave arriving from the transmission side by the antenna and receives it. The video data is demodulated from the received signal and output to the video signal line leading to the broadcast station, so that the relay operation can be obtained.

  At this time, the transmitter T and the receiver R are provided with various detection units composed of sensors, detection circuits, etc., so that the transmitter T and the reception such as the input signal level, the transmission level, the reception level, and the device temperature are received. The operation state data including various kinds of information indicating the operation state of the machine R can be acquired, and then the monitoring device M1 is connected to the transmitter T via the signal line L1, and the receiver R is connected to the receiver R. The monitoring device M2 is connected via the signal line L2, and the above-described operation state data is fetched and monitored by the monitoring devices M1 and M2, respectively, so that the occurrence of an abnormality can be recognized.

However, in the case of the monitoring system of FIG. 6 (a), for example, when some abnormality appears in the transmitter T, and transmission side monitoring data representing the abnormality is given from the operation detection unit, it is shown in FIG. 6 (b). As described above, if an abnormality has occurred in the monitoring data transmission system (including the signal line L1) between the transmitter T and the monitoring device M1, in this case, the monitoring device M1 does not acquire monitoring data and the transmitter T cannot be monitored.
In response to this, there is a method of multiplexing such as a monitoring data transmission system between the transmitter T and the monitoring device M1 is duplexed. In this case, however, the increase in cost becomes a bottleneck.

Here, FIG. 7 shows a case where an image of an example of a wireless transmission system in which the monitoring of the transmitter T can be performed together with the monitoring of the receiver R by the monitoring device MC provided on the receiving side. At T, the operation state of the transmission side device is taken in as monitoring data from the detection unit located there, and this is superimposed on the video data to be transmitted from the transmitter T at this time and transmitted to the receiver R.
On the receiving side, the transmission side monitoring data is separated from the reception data, taken together with its own reception side monitoring data into the monitoring device MC, the operation status of the device is analyzed, the analysis result is displayed on the display D, and an abnormality is detected If an error occurs, an error will be displayed and an alarm will be given.

By the way, in the case of the FPU described above, a well-known signal called TS (Transport Stream) in which video and audio are compressed by MPEG processing is used for transmission of digital video data.
Therefore, there is a wireless transmission system in which transmission side monitoring data is superimposed on this TS signal and transmitted from the transmission side to the reception side. Hereinafter, an example of this system will be described with reference to FIG.
First, the system of FIG. 8 is basically the same as the system of FIG. 7, and the monitoring of the transmitter T is performed in parallel with the monitoring of the receiver R by the monitoring device MC (FIG. 7) provided on the receiving side. Thus, the wireless transmission system can be used in common.

In the case of FIG. 8, the transmitter T on the left side is provided with a multiplexer MUX1 that functions as a video / monitoring data superimposing unit, whereby the transmission side state data is superimposed on the video data TS in the TS signal format. It is sent in the form.
At this time, the transmitter T is provided with various circuit devices similar to those of a general transmitter such as a modulation circuit and a high frequency power amplifier circuit, but these are not shown because they are well known.
Next, similarly in FIG. 8, the receiver R on the right side uses the demultiplexer DEMUX1 functioning as a video / monitoring data separation unit to separate the transmission-side state data from the received video data TS, and the receiver R itself The transmission side monitoring data and the reception side monitoring data are supplied to the monitoring device MC (FIG. 7) together with the receiving side state data.

More specifically, first, in the transmitter T, the arithmetic unit CPU1 captures and monitors various information representing the operation state such as the temperature, voltage, current, signal state, etc. of the transmission side device (mainly the device of the transmitter T). The data is processed and supplied to one input of the multiplexer MUX1.
At this time, the other input of the multiplexer MUX1 is supplied with video data TS for relay from a desired video signal source outside such as a television camera.
Therefore, in the multiplexer MUX1, as shown in FIG. 9, one unit of monitoring data is inserted for each stream of the video data TS, and as a result, video (data) and monitoring (data) are alternately arranged. The signal TS superimposed in an elliptical form is output from the multiplexer MUX1, and this is supplied to the modulation unit of the transmitter T.

Next, in the receiver R, as shown in FIG. 10, the TS signal is supplied from the demodulator to the demultiplexer DEMUX1, and the video data TS and the monitoring data are separated and output.
The video data TS is output as a relay signal to the relay line. On the other hand, the monitoring data (monitoring data) is input to the arithmetic unit CPU 2 and processed into the transmission side monitoring data, together with the reception side monitoring data. It is supplied to the monitoring device MC (FIG. 7) and used for monitoring.
The receiver R is also provided with various circuit devices similar to a general receiver, such as a high-frequency amplifier circuit, an input signal processing circuit, various filters, and a video signal amplifier circuit, although not shown. Needless to say.

  Therefore, according to the wireless transmission system shown in FIG. 8, monitoring at one place by the monitoring device MC enables remote monitoring not only on the reception side but also on the transmission side, eliminating the need for a monitoring device on the transmission side. This eliminates the need for a monitoring data transmission signal line, which is advantageous in terms of cost and eliminates the need to prepare for loss of the monitoring function due to an abnormality in the signal line on the transmission side.

  Here, as conventional techniques related to such a transmission system, for example, disclosures of Patent Documents 1, 2, and 3 can be cited.

JP-A-9-37306 JP-A-9-331300 JP 2007-215066 A

In the above prior art, no consideration is given to the occurrence of an abnormality in the transmission system from the transmission side to the reception side. If a failure occurs in the transmission system, the monitoring on the transmission side will be flawed. There was a problem with sex retention.
If any abnormality occurs in the relay transmission operation from the transmitter to the receiver, in the conventional technology, transmission of image data transmitted from the transmitter side to the receiver side is interrupted, of course, the transmission side Monitoring data is also lost.
Accordingly, if an abnormality occurs on the transmission side at this time, all the transmission side monitoring data representing the content of the abnormality will be lost.

At this time, since the transmission side monitoring data is no longer received at the reception side, any occurrence of any abnormality in the transmission side device including the transmission system can be detected anyway.
Here, when abnormality occurs, it is needless to say that it is meaningful to notify only of the occurrence.
However, in this case, it is more important how quickly and accurately the abnormal recovery can be dealt with. For this purpose, the cause of the abnormal occurrence should be elucidated anyway, and what kind of abnormality has occurred will be known. There is a need.

However, in the prior art, all of the monitoring data on the transmission side is lost when a transmission system abnormality occurs, making it impossible to elucidate the cause thereafter, resulting in a problem in maintaining the reliability of the system. .
It is an object of the present invention to provide a radio transmission system for video signal relay and a transmitter or receiver for the video signal relay in which there is no risk of loss of transmission side monitoring data even when an abnormality occurs in the relay transmission operation.

In order to solve the above-described problem, an embodiment of the present invention acquires a state of a transmission-side device to obtain real-time transmission-side monitoring data, and multiplexes the transmission-side monitoring data into video data including a TS signal and transmits it to the reception side. transmission and, in the wireless transmission system of the video signal relaying to perform on the receiving side the transmission side of the abnormality monitoring, and detection means for detecting the occurrence of a failure in the heat transmission system transmission system at the transmitting side, the transmitting storage means for storing the side monitoring data, the said sender monitors data when occurrence of the failure is detected by the detection means is stored in said storage means, stored in said storage means when said fault has recovered and arithmetic control means for transmitting the transmitting side monitoring data of the real time together with the sender monitoring data to the receiving side by multiplexing the video data composed of the TS signal, is provided The fact it said.

According to the present invention, even when a failure occurs in the relay transmission, the acquisition of the device state on the transmission side is continued and the acquired device state is stored, so even if a failure appears in the relay operation, It becomes possible to elucidate the cause of abnormalities in the transmitting device.
Also, in this case, the stored device status is automatically transmitted to the receiving side when the transmission system function is restored. Therefore, according to the present invention, the cause of the occurrence of the abnormality in the transmitting side device is received. Always possible on the side.

1 is a block diagram showing an embodiment of a wireless transmission system according to the present invention. It is a flowchart which shows the process of the transmission side in one Embodiment of the radio | wireless transmission system by this invention. It is explanatory drawing of the data by the side of transmission in one Embodiment of the wireless transmission system by this invention. It is a flowchart which shows the process of the receiving side in one Embodiment of the wireless transmission system by this invention. It is explanatory drawing of the data on the receiving side in one Embodiment of the wireless transmission system by this invention. It is a block diagram which shows the 1st example of the wireless transmission system by a prior art. It is a block diagram which shows the 2nd example of the wireless transmission system by a prior art. It is a detailed block diagram which shows the 3rd example of the wireless transmission system by a prior art. It is explanatory drawing of the data in a 3rd prior art. It is explanatory drawing of another data in a 3rd prior art.

Hereinafter, a radio transmission system for relaying a video signal according to the present invention and a transmitter or a receiver thereof will be described in detail with reference to the illustrated embodiments.
FIG. 1 shows an embodiment of the present invention. In the figure, FM is a storage device, and the configuration of the transmitter T is basically the same as that of FIG. 8 except that a storage device FM is provided. The multiplexer MUX in FIG. 1 corresponds to the multiplexer MUX1 in FIG. 8 as in the case of the prior art described, and the arithmetic unit CPU is different only in the contents of processing. Is the same.
Further, the receiver R of FIG. 1 is the same as the receiver R of FIG. 8 in hardware except that the contents of processing by the arithmetic unit CPU2 are different. Note that both the arithmetic devices CPU and CPU2 function as arithmetic control means for performing data arithmetic processing control and communication control.

Therefore, also in the embodiment of FIG. 1, the monitoring data is superposed on the TS signal and transmitted from the transmission side to the reception side, whereby the transmitter T is also monitored by the monitoring device MC (FIG. 7) provided on the reception side. ) To function as a wireless transmission system that can be shared in parallel with monitoring of the receiver R.
At this time, the storage device FM is composed of, for example, a flash ROM having a desired storage capacity, and stores and holds data supplied from the calculation device CPU under the control of the calculation device CPU. It reads out and outputs the data.

Next, FIG. 2 is a flowchart showing processing by the arithmetic unit CPU of the transmitter T. The processing is started by starting up the system, and thereafter repeatedly executed for each stream of the video data TS. The control is performed so as to obtain the monitoring operation in the above, that is, the acquisition, recording, and output operations of information on the transmission side.
Therefore, the monitoring operation in the transmitter T will be described below with reference to the flowchart of FIG.
First, when processing is started, device status acquisition and monitoring data generation are first performed (S1). Thereafter, it is determined whether or not a transmission system failure has been detected (S2).

For detection of the occurrence of the failure at this time, for example, the level of the high-frequency power supplied to the antenna from the high-frequency power amplifying unit at the final stage of the transmitter T is monitored, and the power level falls below a predetermined determination level. Then, it may be determined that a transmission system failure has been detected. However, the method is not limited to this method.
In the determination process of S2, first, when the result is True (true), that is, when the occurrence of a failure is detected in the transmission system, the device state acquired at this time is stored in the storage device FM (S3), Thereafter, the process is terminated as it is.

Therefore, if the result of the determination process in S2 is False (No), it is next determined whether or not there is data in the storage device FM that has not been transmitted yet after the failure recovery (S4).
In this determination process S4, first, if the result is True (true), that is, data that has not yet been transmitted remains after the transmission failure is recovered, the data in the storage device is included in the monitoring information. Is added (S5), then the monitoring information and the video data are multiplexed and transmitted (S6), and then the process is terminated.
Therefore, if the result of this determination process S4 is False (No), the process immediately proceeds to process S5, the data of the storage device FM is added to the monitoring information, and the process is terminated.

Here, an operation obtained when the process according to the flowchart of FIG. 2 is executed will be described.
First, in this flowchart, since the case where the process is shifted from the process S2 to the process S3 is set, when a failure occurs in the transmission system, the device state detected at that time is lost because the transmission is not performed. Instead, it is stored and saved in the storage device FM in real time when a failure occurs.

  Next, since the process when the process S2 is shifted from the process S2 to the process S6 through the process S4 and the process S5 is set, the apparatus state remaining in the storage device FM is monitored when the transmission system abnormality is recovered. As a result, as will be described later, the monitoring data at this time is also multiplexed to the video signal TS as monitoring 2, and after passing through processing S2 to processing S4, Since the case where the process immediately shifts to the process S6 is set, the monitoring data based on the apparatus state acquired in real time at this time is supplied to the multiplexer MUX as the monitoring 1 and multiplexed on the video signal TS.

Then, the data flow in the multiplexer MUX in this case is as shown in FIG.
First, when there is no failure in the transmission system, the monitoring data input to the multiplexer MUX is only the monitoring data based on the monitoring 1, that is, the device status acquired in real time.
Next, when a failure occurs in the transmission system and then recovers, the monitoring data input to the multiplexer MUX is acquired during the monitoring 2, that is, during the period from the failure of the transmission system to the recovery. It becomes monitoring data based on the device status, and then becomes monitoring data based on the monitoring 1, that is, the device status acquired in real time.

Here, when a failure occurs in the transmission system, it goes without saying that data is not transmitted from the transmission side to the reception side.
Therefore, in the case of the prior art, the apparatus state acquired during the period when the transmission system has failed is not transmitted and is lost as it is, and nothing remains.
On the other hand, in this embodiment, since the process S3 is executed in this case, the device state is acquired and stored in the storage device FM even during a period when the transmission system is faulty. Then, the stored device state during the failure period is automatically read out by execution of the processing S5 and the processing S6 when the transmission function is removed and the transmission function is restored, and is stored in the TS data. Multiplexed and transmitted.

Next, FIG. 4 is a flowchart showing processing by the arithmetic unit CPU2 of the receiver R. This is also started by starting up the system, and then repeatedly executed at a desired cycle. Control so that a monitoring operation can be obtained.
Therefore, the monitoring operation in the receiver R will be described below with reference to the flowchart of FIG. At this time, the data flow in the demultiplexer DEMUX1 is as shown in FIG.
Here, when the processing according to the flowchart of FIG. 4 is started, it is first determined whether or not data is received (S10).

If the result is true (true), that is, if no radio wave is received, the fact that a failure has occurred in the transmission transmission system is displayed on the display (FIG. 7) (S20). To do.
If the result of the determination process in S20 is False (No), the received data is then separated and analyzed (S30), and then the storage device information (monitoring 2) is added to the separated monitoring data. (S40).

First, when the result is True (true), that is, when the storage data is included in the monitoring data, information based on the monitoring data of monitoring 2 (storage device information) is displayed on the display (S50). Next, information based on the monitoring data (monitoring 1) acquired in real time is displayed on the display (S60), and then the processing ends.
Therefore, if the result of the determination process S40 is False (No), the process immediately proceeds to process S60, and the information based on the monitoring data (monitoring 1) acquired in real time is displayed on the display, and then the process ends.

An operation obtained when the processing according to the flowchart of FIG. 4 is executed by the arithmetic unit CPU2 will be described.
Here, first, in the flowchart of FIG. 4, the case where the process is shifted from the process S10 to the process S20 is set, and since it is not possible to receive the data here, it is understood that some trouble has occurred in the transmission system. As a result, any failure in the transmission system can always be reliably recognized and notified on the receiving side.

Next, in the flowchart of FIG. 4, since the case where the process shifts from the process S40 to the process S50 after the process S30 is set, when a failure occurs in the transmission system, the acquisition of the device status is performed during that time. If so, the device status can be acquired later on the receiving side, and as a result, in any situation, the cause of the occurrence of an abnormality in the transmitting side device can be clarified. The monitoring function for the transmission system can always be maintained reliably.
In addition, since the process S60 is always executed after the process S40, there is no problem in capturing the monitoring data (monitoring 1) acquired in real time, and as a result, the desired monitoring function is always obtained. Can be reliably maintained.

Therefore, the effects of this embodiment are as follows.
First, the device status on the transmitting side is superimposed on the video data TS and transmitted to the receiving side, and the monitoring data is separated on the receiving side so that monitoring can be obtained. As a result, there is no risk of being affected by the abnormality of the monitoring device line on the transmission side, so that the reliability of monitoring can be maintained and cost reduction can be expected.
Next, since the failure is detected due to the interruption of the signal from the transmission side, even if an abnormality occurs in the transmission system from the transmission side, it is possible to deal with it reliably and detect the occurrence of the abnormality. There is no.

And even when a transmission system failure occurs, the acquisition of the device status on the transmission side is continued and the acquired device status is stored, so even if a failure occurs in the transmission system, the cause of the occurrence of an abnormality in the transmission side device Elucidation becomes possible.
Also, in this case, the stored device status is automatically transmitted to the receiving side when the transmission system function is restored, so that the cause of the occurrence of an abnormality in the transmitting side device can always be reliably determined on the receiving side. become.

T transmitter R receiver CPU arithmetic unit FM storage device (flash ROM)
MUX multiplexer (video / monitoring data superimposing section)
DEMUX demultiplexer (video / monitoring data separator)
S1 to S6 Processing on the sending side S10 to S60 Processing on the receiving side

Claims (3)

Acquires the status of the transmitting device as real-time transmission monitoring data, multiplexes the transmission monitoring data into video data consisting of TS signals and transmits it to the reception side, and performs transmission side abnormality monitoring on the reception side In the wireless transmission system for video signal relay
Detection means for detecting the occurrence of a failure in the sheet stearyl beam Transmission system at the transmitting side,
Storage means for storing the transmission side monitoring data;
Wherein said transmitting side monitoring data when occurrence of the failure is detected by the detection means is stored in said storage means, transmitting said real time the with sender monitoring data stored in the storage means when said fault has recovered wireless transmission system for video signal relay, wherein an operation control means for transmitting side monitoring data to the multiplexing to the receiving side to the video data composed of the TS signal, that is provided et the. Acquires the status of the transmitting device as real-time transmission monitoring data, multiplexes the transmission monitoring data into video data consisting of TS signals and transmits it to the reception side, and performs transmission side abnormality monitoring on the reception side In the transmitter of the wireless transmission system for video signal relay ,
Detection means for detecting the occurrence of a failure in the transmission system; storage means for storing the transmission side monitoring data ;
Detects the occurrence of a failure in the transmission system by the detection means known result, and stores the device state is acquired upon the detection in the storage means, the detection knowledge the fault is stored in the storage means after returning As a result of determining the transmission incompletion device status when a failure occurs, if the data of the transmission incomplete is present in the storage means, it was included sender monitoring data of the real time to the transmission-side monitoring data wireless transmission system for video signal relay to the operation control means for transmitting the multiplexed and the transmission-side monitoring data and the video data by adding the device state when the fault occurs on, that is provided, wherein Transmitter. Acquires the status of the transmitting device as real-time transmission monitoring data, multiplexes the transmission monitoring data into video data consisting of TS signals and transmits it to the reception side, and performs transmission side abnormality monitoring on the reception side In the receiver of the wireless transmission system for video signal relay ,
A monitoring device for monitoring the sending device, a display for displaying information ,
Data it is determined whether the received, if the data is not received indicates that the fault on the transmission side apparatus has occurred on the display, the sender monitoring if the data has been received separates the data and the video data, it determines whether a failure in the transmitting side monitoring data relevant separated in the transmitting side device includes data for device status of the transmitting device stored upon occurrence result, if it does not contain the relevant data displays the sender monitoring data of the real-time included in the transmission-side monitoring data to the display, if such data is included in the transmitting device Table data of the device state of the transmitting device and displayed on the display, the further sender monitoring data of the real time to the display stored in the event of a failure The receiver of the radio transmission system for video signal repeater, characterized in that the arithmetic control unit, is provided for.

Images