JP2001216093A - Data recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and accurately correct mismatching between collected and sending data which are stored in each data base of a duplexed system. SOLUTION: When mismatching of the collected and sending data which are registered in a primary data base server 122 and a secondary data base server 132 occurs between two systems, a mismatching restoration screen is displayed at one of operation terminals 14 to easily decide the discordant items. Then an operator confirms the discordant items of both collected and sensing data on the mismatching restoration screen and then copies the collected or sending data of the correct server 122 or 132 to the other with a simple operation. Thus, the matching is secured between the collected and sensing data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording / reproducing apparatus suitable for use in, for example, a video server system used in a broadcasting company, particularly a broadcasting station of a general broadcasting company.

[0002]

2. Description of the Related Art In recent years, a data recording / reproducing apparatus called a video server (or AV server) for performing non-linear recording / reproducing using a randomly accessible recording medium in place of sequential (linear) recording / reproducing using a VTR tape has become widespread. I am doing it. Generally, a video server used as a broadcasting station equipment requires a high data transfer rate and a large storage capacity to enable long-time data recording due to requirements for image quality and sound quality. Is done.

[0003] Therefore, RAID (Redundan) comprising a plurality of hard disk devices which perform recording and reproduction operations in a time-division manner.
Using Arrays of Inexpensive Disks), material data consisting of multiple audio and video data is recorded in a distributed manner and transmitted simultaneously on multiple channels, or the playback time of the same material data is staggered for multiple channels. By playing, so-called VOD (video on demand) or NVOD
(Near video on demand). This type of technology is described in, for example,
No. 625.

In the data recording / reproducing apparatus, there is a system in which a standby transmission apparatus (backup system) is installed in case of a failure of the active transmission apparatus, and the operation is immediately switched to the standby system to continue operation. Proposed.
In this case, the active system and the standby system have exactly the same function, including the device, the database for registering and managing the recorded data for recording the audio and video signals, and the transmission data for reproducing the recorded material. It has. This type of technology is described in, for example, Japanese Patent Application Laid-Open No. 10-27.
No. 1077 is disclosed.

In such a data recording / reproducing apparatus, the active system and the standby system each have the same data as recording data for recording audio / video signals and transmission data for reproducing recorded materials. Registered from the host system (host device).

[0006]

As described above, in a data recording / reproducing apparatus in which the working system and the standby system are completely duplicated, communication errors with the upper system, errors in the registered database, If the recorded data or the transmitted data is inconsistent between the active system and the standby system due to an editing operation on the database or the like, continuous operation cannot be performed. Therefore, conventionally, when inconsistency has occurred in the recorded data and transmitted data between the active system and the standby system, the recorded data and transmitted data of the active system and the standby system are displayed on a display device, and the inconsistency is detected. The operator has to manually change the recorded data and the transmitted data while checking the generated data, so that the inconsistency of the data must be resolved, which is very troublesome.

Accordingly, the present invention provides a data recording / reproducing apparatus which can easily and accurately correct inconsistency between recorded data and transmitted data registered in each database in a duplex system. The purpose is to provide.

[0008]

According to a first aspect of the present invention, there is provided a data recording / reproducing apparatus for recording material data on a recording medium in accordance with control information supplied from a host device. Active transmission device for transmitting the material data, and in the event that a failure occurs in the active transmission device, the same configuration as the active transmission device, in order to be able to operate as a substitute for the active transmission device, and In a data recording and reproducing device comprising a backup transmission device operated according to the same control information as the control information,
Monitoring means for monitoring whether or not the control information of the active transmission apparatus and the control information of the standby transmission apparatus are coincident with each other; Display means for displaying the control information of the active transmission device and the control information of the standby transmission device in a comparable manner when it is confirmed that inconsistency has occurred with the control information of the active transmission device; And correcting means for replacing the control information of one of the device and the backup transmission device with the mismatched control information.

In a preferred embodiment, in the data recording / reproducing apparatus according to the first aspect of the present invention, the data is matched from the control information in which the mismatch has occurred, which is displayed on the display means. The information processing apparatus may further include a selection unit that selects control information to be provided, and the correction unit may perform replacement on the control information selected by the selection unit.

In a preferred embodiment, for example, in the data recording / reproducing apparatus according to the first aspect, the control information of the active transmission apparatus is inconsistent with the control information of the standby transmission apparatus. In the case where a mismatch has occurred, an extracting means for extracting the control information having the mismatch may be provided, and the display means may display only the control information having the mismatch extracted by the extracting means. .

In the present invention, the monitoring means monitors whether the control information of the active transmission device matches the control information of the standby transmission device, and monitors the control information of the active transmission device. When it is confirmed that inconsistency has occurred between the control information of the standby transmission device and the control information of the standby transmission device, the display means displays the control information of the active transmission device and the control information of the standby transmission device in a comparable manner. And by the correction means,
The control information of one of the active transmission device and the backup transmission device in which the mismatch has occurred replaces the other control information. Therefore, in the duplex system, it is possible to easily and accurately correct the mismatch between the recorded data and the transmitted data registered in each database.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. A. Configuration of Embodiment FIG. 1 is a block diagram showing a configuration of a data recording / reproducing system according to an embodiment of the present invention. In the figure, a data recording / reproducing system includes a primary (working) RAID controller 10 and a secondary (standby) RAID controller 1.
1. Primary side (working system) control terminal group 12, secondary side (standby system)
Control terminal group 13, operation terminal group 14, positive-side gateway terminal 15, positive-side gateway terminal 16,
And a network (Ethernet) 100.

The primary RAID controller 10 comprises a RAID 101 comprising a plurality of hard disk devices, an encoder 102 for encoding input audio / video signals, and a RAI.
It comprises a decoder 103 for decoding audio / video data recorded in D103, and a signal switching device 104 for switching input / output of a plurality of video / audio signals for output. Similarly, the secondary RAID control device 11 includes a RAID 111 including a plurality of hard disk devices, an encoder 112 for encoding input audio / video signals, a decoder 113 for decoding audio / video data recorded on the RAID 103, And a signal switching device 114 for switching the input / output of the video / audio signal.

A video / audio signal 118 from an external device 110 such as a line / VTR / editing machine is input to the primary RAID controller 10 and the secondary RAID controller 11, while each of them is on-air (ONAIR). ), Next (NEXT), external output (AUX), preview (Pr
view), and sends out the edit output. The output is
Switched and final video / audio signal final output 11
9 is output.

The network 100 includes a main line 101 of the network and branch lines 102, 102,... Of the network laid in the broadcasting station. The RAID controllers 10 and 11 and the various terminals 12 to 1 are arranged according to a predetermined protocol.
6 is connected.

The control terminal group 12 on the primary side includes a control device 12
1. It comprises a database server 122 and a server management terminal 123. The control device 121 controls the operation of the primary-side RAID control device 10 (RAID 101, encoder 102, decoder 103, and signal switching device 104).
The database server 122 holds data for recording and transmission in the primary RAID controller 10. The server management terminal 123 issues a control command to the control device 121 and manages the control of the RAID control device 10.

The control terminal group 13 on the secondary side includes a control device 13
1. It comprises a database server 132 and a server management terminal 133. The control device 131 controls the operation of the secondary RAID control device 11 (RAID 111, encoder 112, decoder 113, signal switching device 114).
The database server 132 holds data for recording, sending, and the like in the secondary RAID controller 11. The server management terminal 133 issues a control command to the control device 131 and the secondary RAID control device 1
The first control is managed.

The operation terminal group 14 includes the sending terminal 1
41, a recording terminal 142 and an editing terminal 143.
The sending terminal 141 performs an operation of sending the stored material data to the RAID controllers 10 and 11. The recording terminal 142 performs a material data recording operation on the RAID controllers 10 and 11. The editing terminal 143 performs an editing operation of a video / audio signal to be stored in the RAID control devices 10 and 11. The gateway terminal 15 has an interface function between the host system and the primary RAID controller 10 and exchanges various data. The gateway terminal 16 has an interface function between the host system and the secondary RAID controller 11, and exchanges various data.

The above database servers 122 and 132
In each of these, the same recorded data is registered in advance from a higher-level system in order to manage the recording method of audio / video signals to be recorded, the content of the material, and the like for each material. The recorded data registered in the database servers 122 and 132 is displayed on the recording terminal 142 as a recording screen.

B. Next, an operation of the above-described embodiment will be described. Here, FIG. 2 is a flowchart for explaining the operation of the present embodiment. Primary system (RAID controller 1
0, the control terminal group 12, the gateway terminal 15) and the secondary system (RAID controller 11, the control terminal group 13, the gateway terminal 16) are activated, and then both systems register data, record and reproduce materials, etc. Is performed.

Here, the operation of selecting a video / audio signal will be described first. The plurality of audio / video signals input to the signal switching devices 104 and 114 are selected based on the recorded data displayed on the recording terminal 142. Recording terminal 14
2 stores a signal switching request in the server management terminals 123 and 133 in order to store the selected video / audio signal in the primary RAID controller 10 and the secondary RAID controller 11.
To send to. The server management terminals 123 and 133 receive the signal switching request, create an execution instruction at the same time, and send the execution instruction to the control devices 121 and 131. Control device 1
21 and 131 control the switching of the line signal selected by the recording terminal 142 to the signal switching devices 104 and 114 so that the input signal line and the output signal line are connected. The video is displayed on the monitor screen of the recording terminal 142. The RAID controllers 10 and 11 encode the selected video / audio signals by the encoders 102 and 112 for the recording time (length) registered in the recorded data,
Recorded in RAID 101, 111. Note that the flow of control of each device performed when recording an audio / video signal is the same as that when the video / audio signal is selected, and a description thereof will be omitted.

Here, FIG. 3 is a schematic diagram showing an example of a display screen of recorded data displayed on the recording terminal 142 according to the present embodiment. The recording data is data for specifying a recording source channel, a recording start time, a recording length, and a recording method of a video / audio signal to be recorded on the server. In the figure, on the display screen of the recording terminal 142, the contents of the recording data include a program code 200, a recording date 201, a recording start / end 202, a material length 203, a recording source 204, a program name 205, a subtitle 206, a MAIN 207, S
The UB 208 and the recording method 209 are displayed. The program code 200 is an ID for identifying a material recorded in the RAID control devices 10 and 11. The recording date 201
This is data indicating the scheduled recording date or the actual recording date. The recording start / end 202 is data indicating the scheduled recording start time or the actual recording start time in the upper part, and the recording scheduled end time or the actual recording end time in the lower part. The material length 203 is data indicating the planned material length or the actual recorded material length in time. The recording source 204 indicates the input port name of the audio / video signal to be recorded,
"IT1" is the first non-linear editor, "EDIT2" is the second non-linear editor, and "BS1" is the line type BS.
No. 1 and "VTR4" are data indicating No. 4 of the VTR.

Next, the program name 205 indicates the name of a program using the material, and the subtitle 206 is data indicating the title of the material. Further, MAIN 207 indicates the recording status on the positive side, “unrecorded” indicates a state in which no audio / video signal is recorded, and “recorded” is data indicating a state in which an audio / video signal is recorded. is there. Further, SUB 208 indicates the recording status of the secondary side, like the above-described primary side, “unrecorded” indicates a state in which no audio / video signal is recorded, and “recorded” indicates that an audio / video signal is recorded. This is data indicating the state in which it is running. The recording method 209 indicates a recording method, "manual" indicates manual recording by operating the recording screen, and "blank" indicates data indicating automatic recording based on the time of the recorded data.

Next, the reproduction operation of the audio / video signal will be described. The database servers 122 and 132
The same transmission data is registered from the upper system according to the recorded transmission schedule of each material. The transmission data registered in the database servers 122 and 132 is
This is displayed on the monitor screen of the sending terminal 141 as a sending screen. The materials recorded in the RAIDs 101 and 111 are put on standby for reproduction in accordance with the transmission order of the transmission data, and the reproduction is started. Note that the flow of control of each device performed during reproduction of an audio / video signal is the same as that at the time of video / audio signal selection described above, and will not be described.

FIG. 4 is a schematic diagram showing an example of a display screen of transmission data displayed on the transmission terminal 141 according to the present embodiment. The transmission data is data for specifying the transmission order, transmission start time, transmission length, and the like of the recorded video / audio signals. In the figure, the display screen of the sending terminal 141 displays program codes 300,
Transmission start / end 301, transmission length / material length 302, program name 3
03, subtitle 304, MAIN305, SUB3
06 and the sending date 307 are displayed. Program code 30
0 is an ID for identifying a material as described above. The transmission start / end 301 is data indicating the scheduled broadcast start time or the actual broadcast start time in the upper part, and the broadcast scheduled end time or the actual broadcast end time in the lower part. The transmission length / material length 302 is data indicating the broadcast-scheduled material length or the actual broadcast material length in the upper part, and the actual material length of the material in the lower part in time. As described above, the program name 303 indicates the name of the program using the material, and the subtitle 30
4 is data indicating the title of the material. Also, MA
IN 305 indicates the playback status on the positive side, “playback standby” indicates that the material is in a standby state,
“Blank” is data indicating that the material is in an idle state. The SUB 306 indicates the reproduction status of the secondary side. As in the case of the primary side, "reproduction standby" indicates that the material is in a standby state, and "blank" is data indicating that the material is in an idle state. The transmission date 307 is data indicating a scheduled broadcast date or an actual broadcast date.

As described above, a series of processing from recording to reproduction of a video / audio signal is performed by the recording server registered in the database server 122 of the primary RAID controller 10 and the database server 132 of the secondary RAID controller 11. This is performed according to the data and the transmission data. Usually, the primary database server 122 and the secondary database server 1
32, the same recorded data and the same transmitted data are registered, so that the primary RAID controller 10 and the secondary RAID controller 11
The same recording and reproduction processing is performed.

During the above-described series of processing, the database servers 122 and 132 are recorded between the active system and the standby system due to communication errors with the upper system, errors in the registered database, editing operations on the database, and the like. When there is a mismatch between the data and the transmitted data, the operator confirms the mismatch by displaying a warning on the warning display screen shown in FIG. In FIG. 5, a “record search” button 400, a “send” button 401, a “manage” button 402, an NCS / GW 403, an APC / GW 40 are displayed on the warning display screen.
4, SVM405, Database406, SMS /
GW407, Editor408, MAIN409, S
UB410, "Z" icon 411, Device41
2, Server 413, AUX 414 and Max
Buttons, icons and display items such as Dur Available 415 are displayed. "Record search" button 40
0 is a button for activating a recording screen. The “send” button 401 is a button for starting a send screen. The “manage” button 402 is a button for starting a management job screen. The NCS / GW 403 displays the operation status of the host system that transmits the recording data and the transmission data. The APC / GW 404 displays the operation state of the host system that performs transmission control.

Further, the SVM 405 displays the operating status of the server management terminal. Database 406 displays the operating status of the database server. SMS / G
W407 displays the operation state of the control terminal. Edit
or 408 indicates the operating state of the nonlinear editing terminal. MAIN 409 indicates the operating state of the primary RAID controller 10. The SUB 410 indicates the operating state of the secondary RAID controller 11. The “Z” icon 411
This is to warn of a mismatch between the recorded data and the transmitted data between the primary system and the secondary system. De
The device 412 displays the operating status of the device under the control of the control terminal. Server 413 sends out 2
Displays the remote / local of each control of the system output. The AUX 414 displays the use status of the two-system one-shot transmission function. Max Dur Availab
“le” 415 indicates the maximum possible continuous recording time.

In FIG. 5, the method of displaying the warning is a “Z” icon 411 between a “MAIN” button 409 representing the primary system and a “SUB” button 410 representing the secondary system. Express by color. For example, if there is no inconsistency between both systems, the “Z” icon 411 is displayed in blue, and if there is inconsistency, the “Z” icon 412 is displayed in red. I do.

Next, the operation operator activates an inconsistency recovery screen in order to carry out the contents of the inconsistency and its recovery. Here, in the operation terminal, on the inconsistency screen, it is determined whether or not “start recording data collation” is selected from the work menu (step S1), and whether or not “start transmission data collation” is selected from the work menu (step S1).
2) From the file menu, select “End of inconsistency recovery screen”
Is determined (step S3). If neither is selected, the process returns to step S1 and repeats the above determination.

Then, as shown in FIG. 6, when the operation operator selects "Start data collation (hatched portion in FIG. 6)" 501 from work menu 500 on the inconsistency recovery screen (YES in step S1), Primary database
The recorded data is read from the server 122 and the secondary database server 132, and a collation check is performed (step S4). Next, as a result of the collation check, a list of recorded data determined to be inconsistent is displayed on the inconsistency recovery screen. That is, as shown in FIG. 7, the content of the mismatch is displayed on the mismatch recovery screen.

In FIG. 7, a program code 600 is an ID for identifying a material as described above. Program name 6
01 indicates the program name using the material as described above, the upper part is the program name in the primary system (MAIN), and the lower part is the program name in the secondary system (SUB). The status 602 indicates the recording status of the audio / video signal. The upper row is the recording status of the primary side, and the lower row is the recording status of the sub side. In the recording status, “unrecorded” indicates a state where no audio / video signal is recorded, and “recorded” indicates a state where an audio / video signal is recorded.

Next, SOM603 indicates:
The lower SOM is the primary SOM. As described above, the material length 604 is data indicating the actual material length of the material in time. The upper row is the length of the positive side material, and the lower row is the length of the subside material. As described above, the recording date 605 is data indicating the scheduled recording date or the actual recording date. The upper row shows the scheduled recording date or the actual recording date on the positive side, and the lower row. Is the planned recording date of the vice side or the actual recording date. The recording start time 606 is the scheduled broadcast start time or the actual broadcast start time, the upper row is the primary broadcast scheduled start time or the actual broadcast start time, and the lower row is the secondary broadcast scheduled start time or the actual broadcast start time. Is the broadcast start time. The recording resource indicates the input port name of the audio / video signal to be recorded as described above. The upper part is the primary recording resource, and the lower part is the secondary recording resource.

As shown in FIG. 7, the operator displays the inconsistency recovery screen in correspondence with the contents of the primary side in the upper row and the contents of the secondary side in the lower row for each item. It is possible to easily determine which items are inconsistent with the secondary side. In the example shown in FIG. 7, in the program whose program code 600 is “1014-006”, the program name is different between the primary system and the secondary system. Also, in a program whose program code 600 is "1014-020", the primary system and the secondary system have different material lengths and recording resources. Further, for the program whose program code 600 is “1014-103”, the program name differs between the primary system and the secondary system.

The operator confirms the displayed inconsistent data, determines whether the recorded data of the primary system or the secondary system is correct, and selects a recovery processing method (step S6). . For example, if the recorded data of the primary system is correct, as shown in FIG.
Select 502. At this time, the data of the mismatch list is changed to red. On the other hand, if the recorded data of the secondary system is correct, as shown in FIG. 8, the user selects “all match SUB (purple)” 503 from the work menu 500. At this time, the data of the mismatch list is changed to purple. Next, as shown in FIG. 9, the operation terminal determines whether or not “execute” 504 of the work menu 600 has been selected (step S7). If not, the operation terminal enters a standby state.

On the other hand, when the operator selects "execute" 504 in the work menu 600, the recorded data is copied according to the recovery processing method (step S).
8). For example, from the work menu 500, "All MAIN
If “Fit to (red)” 502 is selected, the recorded data displayed on the inconsistency list is copied from the database server 122 of the primary system to the database server 132 of the secondary system. This makes it possible to easily match the recorded data between the primary system and the secondary system.

On the other hand, when the operating operator selects "start transmission data collation" 505 from the work menu 500 on the inconsistency restoration screen shown in FIG. 6 (YES in step S2),
The processing of steps S4 to S8 described above is performed on the transmission data of both the primary system and the secondary system. As a result, transmission data between the primary system and the secondary system can be easily matched.

When the operator selects "end of inconsistency recovery screen" (not shown) from the file menu 510 on the inconsistency recovery screen (YE in step S3).
S), the process ends.

When matching only the selected recording data, select the item to be matched, and if the recording data of the primary system is correct, select "Selected Data" from the work menu 500 as shown in FIG. To MAIN (red) "506. On the other hand, if the recorded data of the secondary system is correct, the user selects “match selected data to SUB (purple)” 507 from work menu 500. As described above, when the “match selected data to SUB (purple)” 507 is selected, the data in the mismatch list is changed to purple.

According to the above-described embodiment, in a system in which the primary system and the secondary system are duplicated, the recorded data and the transmission data registered in the respective database servers 122 and 132 are transmitted between the systems. When an inconsistency has occurred, an inconsistency recovery screen is displayed in which it is possible to easily determine which item is inconsistent. This makes it possible to quickly identify inconsistent items between recorded data and transmitted data.
The transmitted data can be easily matched.

[0041]

According to the first aspect of the present invention, the monitoring means monitors whether or not the control information of the active transmission device and the control information of the standby transmission device match each other. When it is confirmed that inconsistency has occurred between the control information of the system sending device and the control information of the backup system sending device, the display means displays control information of the working system sending device and control information of the backup system sending device. Are displayed in such a way that they can be compared with each other, and the correction information is replaced with the control information of one of the active transmission device and the standby transmission device in which the other control information is inconsistent. In such a system, there is an advantage that the inconsistency between recorded data and transmitted data registered in each database can be easily and accurately corrected.

According to the second aspect of the present invention, the control unit selects the control information to be matched from the mismatched control information displayed on the display unit by the selection unit. The control information is replaced by the control information having one of the inconsistencies by the correcting means, so that in the duplex system, the recording information registered in each database is stored. The advantage is obtained that the mismatch between the data and the transmitted data can be easily and accurately corrected.

According to the third aspect of the present invention, when there is a mismatch between the control information of the active transmission device and the control information of the backup transmission device, a mismatch is generated by the extracting means. Since the control information is extracted and only the extracted control information having an inconsistency is displayed by the display means, the recorded data registered in each database in the duplicated system. This makes it possible to easily and accurately correct the mismatch between the data and the transmission data.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a data recording / reproducing system according to an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the present embodiment.

FIG. 3 is a schematic diagram showing an example of a display screen on which the content of recorded data is displayed according to the embodiment.

FIG. 4 is a schematic diagram showing an example of a display screen on which the content of transmission data is displayed according to the embodiment.

FIG. 5 is a schematic diagram showing a warning display screen displayed when inconsistency occurs in recorded data and transmitted data between the primary system and the secondary system.

FIG. 6 is a schematic diagram illustrating an operation on an inconsistency recovery screen according to the embodiment.

FIG. 7 is a schematic diagram illustrating an example of an inconsistency recovery screen according to the embodiment.

FIG. 8 is a schematic diagram illustrating an operation on an inconsistency recovery screen according to the embodiment.

FIG. 9 is a schematic diagram illustrating an operation on an inconsistency recovery screen according to the embodiment.

[Explanation of symbols]

10: RAID controller on the positive side (active system transmission device)
11... Secondary RAID control device (standby transmission device)
Reference numeral 12: Primary control terminal group, 13: Primary control terminal group, 14: Operation terminal group (display means, correction means, selection means, extraction means), 15: Primary gateway terminal, 16 ...... Secondary gateway terminal, 121 ...
Primary control terminal, 122: Primary database server, 123: Primary server management terminal, 131: Secondary control terminal, 132: Secondary database server,
133: secondary server management terminal

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/91 H04N 5/93 E 5/93 G11B 27/00 A

Claims (3)

[Claims] An apparatus for recording material data on a recording medium in accordance with control information supplied from a host device and for transmitting the recorded material data, and a problem occurring in the active system transmitting device. A data recording / reproducing device having the same configuration as the active transmission device and a standby transmission device operated in accordance with the same control information as the active transmission device so as to be operable as a substitute for the active transmission device A monitoring unit that monitors whether control information of the active transmission device matches control information of the standby transmission device; and the monitoring unit controls the control information of the active transmission device and the backup information. When it is confirmed that inconsistency occurs with the control information of the system transmission device, the control information of the active system transmission device and the control information of the backup system transmission device are displayed in a comparable manner. Data recording / reproducing comprising: display means for displaying data; and correction means for replacing the control information of one of the active transmission apparatus and the standby transmission apparatus with the mismatched control information. apparatus. 2. The apparatus according to claim 1, further comprising a selection unit for selecting control information to be matched from the control information in which the mismatch has occurred, displayed on the display unit, wherein the correction unit is selected by the selection unit. The data recording / reproducing apparatus according to claim 1, wherein replacement is performed on the control information. 3. When there is an inconsistency between the control information of the active transmission device and the control information of the standby transmission device, the display device includes extraction means for extracting the inconsistent control information. 2. The data recording / reproducing apparatus according to claim 1, wherein only the control information extracted by the extracting unit and having the mismatch is displayed.