WO2000049503A1 - Procede et dispositif d'enregistrement et de reproduction de donnees numeriques - Google Patents

Procede et dispositif d'enregistrement et de reproduction de donnees numeriques Download PDF

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Publication number
WO2000049503A1
WO2000049503A1 PCT/JP2000/000843 JP0000843W WO0049503A1 WO 2000049503 A1 WO2000049503 A1 WO 2000049503A1 JP 0000843 W JP0000843 W JP 0000843W WO 0049503 A1 WO0049503 A1 WO 0049503A1
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WIPO (PCT)
Prior art keywords
recording
digital data
file
cluster
data
Prior art date
Application number
PCT/JP2000/000843
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English (en)
Japanese (ja)
Inventor
Masayuki Takahashi
Original Assignee
Matsushita Electric Industrial Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Publication of WO2000049503A1 publication Critical patent/WO2000049503A1/fr

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/14—Error detection or correction of the data by redundancy in operation
    • G06F11/1402—Saving, restoring, recovering or retrying
    • G06F11/1415—Saving, restoring, recovering or retrying at system level
    • G06F11/1435—Saving, restoring, recovering or retrying at system level using file system or storage system metadata
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/14—Error detection or correction of the data by redundancy in operation
    • G06F11/1402—Saving, restoring, recovering or retrying
    • G06F11/1415—Saving, restoring, recovering or retrying at system level
    • G06F11/1441—Resetting or repowering

Definitions

  • the present invention relates to a digital data recording / reproducing method for recording / reproducing digital data on a disk recording medium and a digital data recording / reproducing apparatus, and in particular, to a digital data for preventing file destruction and data loss upon abnormal termination such as a power failure.
  • the present invention relates to a recording / reproducing method and a digital data recording / reproducing apparatus using the digital data recording / reproducing method.
  • FIG. 16 is a diagram showing a configuration of a conventional uninterruptible power supply system.
  • a conventional uninterruptible power supply system includes an input / output device 1302 for inputting / outputting data, and a control signal for controlling a process in response to an input / output signal from the input / output device 132.
  • Control personal computer 1301 that outputs to I / O device 1302, uninterruptible power supply 1303 that can temporarily supply power even in case of power failure, and commercial power from this uninterruptible power supply 1304
  • an operation check circuit 1303 for determining that a power failure has occurred if the commercial power loss signal has continued for a predetermined time or more in response to a commercial power failure signal indicating a power failure state.
  • the control personal computer 1301 receives the signal indicating the power failure from the operation check circuit 130.3 and performs the closing process on the active file.
  • the operation check circuit 1303 monitors the power supply voltage for abnormality, and when an abnormality occurs, an automatic notification is made by the telephone line automatic notification device 135.
  • the control personal computer 1301 can perform the closing process of the active file. No destruction or data loss occurred.
  • FIG. 17 is a diagram showing a file recording structure in a recording medium of a disk recording medium employed in a computer ⁇ S such as MS-Windows (manufactured by Microsoft Corporation).
  • the recording area of the disk recording medium is composed of a root directory 1441, a file location table 1442, and a cluster 1443.
  • the root directory 1401 holds the name of the file stored on the disk recording medium and the head cluster number of the file.
  • the file allocation table 1442 holds the connection information of the cluster 1403 in which the file is formed.
  • the cluster 1443 is the minimum unit for recording and reproduction on the disk recording medium, and holds actual data.
  • the root directory 1441 indicates that a file named Data1 is stored in this disk recording medium from the cluster number 0002, and the file allocation table 14 0 2 is Data 1 is class Data number 0002, cluster number 0003, and cluster number 0004 in that order. Therefore, it is indicated that the actual data of Data 1 is stored in the area of the cluster number 0002, the cluster number 0003, and the cluster number 0004 of the cluster 1403.
  • FFFF of the file allocation table 1402 is a cluster number indicating the last cluster of the file.
  • the root directory 1401 and the file allocation table 1402 are fixed to the disk recording medium, and each of the clusters 1403 has a location other than the rate directory 1401 and the file allocation table 1402. The area of the disk recording medium is used.
  • the data of the file allocation table 1402 is written in the cluster 1403 while updating the information of the file allocation table 1402 in the memory, and at the time of the data recording end processing, that is, the final close processing.
  • the disk recording Since the file location table 1402 of the medium has not been updated, the file location table 1 showing the connection information of the cluster 1403 from the start of recording until the power failure despite the fact that the data was recorded in the cluster 1403 402 connection information has been lost, resulting in file corruption and data loss.
  • the present invention has been made in view of the above problems, and provides an inexpensive digital data recording / reproducing method that does not cause file destruction and data loss when an abnormal termination such as a power failure occurs during data recording. It is intended to provide a digital data recording / reproducing device. Disclosure of the invention
  • the digital data recording / reproducing method according to claim 1 of the present invention is the digital data recording / reproducing method for recording / reproducing digital data in cluster units, which is the minimum data recording unit on a disk recording medium.
  • the first step is to construct a file structure by connecting recordable clusters on the recording medium
  • the second step is to record digital data from the beginning of the recordable cluster
  • the recording end cluster is from the recording start cluster
  • a third step of configuring the digital data up to as a recording file is to construct a file structure by connecting recordable clusters on the recording medium
  • the second step is to record digital data from the beginning of the recordable cluster
  • the recording end cluster is from the recording start cluster
  • a third step of configuring the digital data up to as a recording file is the digital data recording / reproducing method for recording / reproducing digital data in cluster units, which is the minimum data recording unit on a disk recording medium.
  • the area where the digital data is recorded exists as a part of the file when the power supply is resumed, and is recorded after the abnormal end is restored.
  • Data recorded from the start to the abnormal end can be played back, and file destruction and data loss at the time of abnormal end can be prevented at low cost.
  • the digital data recording / reproducing method according to claim 2 of the present invention is the digital data recording / reproducing method according to claim 1, wherein the data recording is abnormally terminated during the data recording of the second step.
  • the digital data recorded from the start of data recording to the abnormal end is stored in the recording file based on the format information of the digital data and the step of detecting abnormal termination of the data recording after the abnormal end recovery. And further comprising:
  • abnormal termination such as a power failure occurs during digital data recording Not only can the data recorded from the start of recording to the abnormal end when power is resumed, but also the recordable part can be recovered as a recording file similar to the file that has been subjected to normal data recording termination processing. In this way, it is possible to inexpensively prevent file destruction and data loss when abnormal termination occurs.
  • the digital data recording / reproducing method according to claim 3 of the present invention is the digital data recording / reproducing method according to claim 2, wherein the format information of the digital data is a transport packet synchronization byte. It is characterized by the fact that
  • the present invention even if an abnormal end such as a power failure occurs during digital data recording, not only can data recorded from the start of recording to the abnormal end when power is resumed be reproduced, but also the recordable portion can be recorded in a normal manner. It is possible to recover as a recording file similar to the file that has been subjected to the data recording end processing, and it is possible to inexpensively prevent file destruction and data loss when abnormal termination occurs.
  • a digital data recording / reproducing method according to claim 4 of the present invention is the digital data recording / reproducing method according to claim 2, wherein the format information of the digital data is time information. It is assumed that. According to the present invention, even if an abnormal end such as a power failure occurs during digital data recording, not only can data recorded from the start of recording to the abnormal end when power is resumed be reproduced, but also the recordable portion can be recorded in a normal manner. It is possible to recover as a recording file similar to the file that has been subjected to the data recording end processing, and it is possible to inexpensively prevent file destruction and data loss when abnormal termination occurs.
  • a digital data recording / reproducing method is a digital data recording / reproducing method for recording / reproducing digital data in a cluster unit which is a minimum unit of data recording on a disk recording medium. Adding a file identifier and cluster connection information to the cluster, and if the data recording ends abnormally in the middle of the data recording, detecting that the data recording has ended abnormally after the abnormal end recovery And a step of restoring cluster connection information based on the file identifier recorded in the cluster and the cluster connection information. Things.
  • the file location table of the data file recorded from the start of recording to the abnormal end can be restored at the start of energization, and the reproducible portion can be restored. Can be recovered as a file format.
  • file destruction and data loss at the time of abnormal termination can be prevented at low cost.
  • a digital data recording / reproducing apparatus is a digital data recording / reproducing apparatus, comprising: a disk recording medium for storing digital data in a cluster unit which is a minimum data recording unit; Storing, a file structure management unit for reading digital data from the disk recording medium, wherein the disk recording medium has a file structure in which all clusters are connected in advance. Things.
  • the area where the digital data is recorded exists as a part of the file when the power supply is resumed, and is recorded after the abnormal end is restored.
  • Data recorded from the start to the abnormal end can be played back, and file destruction and data loss at the time of abnormal end can be prevented at low cost.
  • the digital data recording / reproducing device is the digital data recording / reproducing device according to claim 6, wherein the file structure management unit performs data recording during recording of digital data.
  • the apparatus has a file restoration processing unit that configures digital data recorded from the start of data recording to the abnormal termination based on the format information of the digital data after the abnormal termination recovery as recorded data. It is characterized by the following. According to the present invention, even if an abnormal end such as a power failure occurs during digital data recording, not only can data recorded from the start of recording to the abnormal end when power is resumed be reproduced, but also the recordable portion can be recorded in a normal manner. It is possible to recover as a recording file similar to the file that has been subjected to the data recording end processing, and it is possible to inexpensively prevent file destruction and data loss when abnormal termination occurs.
  • the digital data recording / reproducing apparatus according to claim 8 of the present invention is characterized in that: 8.
  • the present invention even if an abnormal end such as a power failure occurs during digital data recording, not only can data recorded from the start of recording to the abnormal end when power is resumed be reproduced, but also the recordable portion can be recorded in a normal manner. It is possible to recover as a recording file similar to the file that has been subjected to the data recording end processing, and it is possible to prevent the destruction of the file and the loss of data at the time of abnormal termination at low cost.
  • the digital data recording / reproducing apparatus according to claim 9 of the present invention is characterized in that, in the digital data recording / reproducing apparatus according to claim 7, the format information is time information. Things.
  • the present invention even if an abnormal end such as a power failure occurs during digital data recording, not only can data recorded from the start of recording to the abnormal end when power is resumed be reproduced, but also the recordable portion can be recorded in a normal manner. It is possible to recover as a recording file similar to the file that has been subjected to the data recording end processing, and it is possible to inexpensively prevent file destruction and data loss when abnormal termination occurs.
  • the digital data recording / reproducing apparatus according to claim 10 of the present invention is a digital data recording / reproducing apparatus.
  • a file structure management unit for reading digital data from the disk recording medium is provided, and when the data recording ends abnormally during the recording of digital data, the file structure management unit enters the cluster after the abnormal end recovery.
  • the digital still camera further comprises a file recovery processing section configured as digital data recorded from the start of data recording to the abnormal termination based on the recorded file identifier and the cluster connection information.
  • the file location table of the data file recorded from the start of recording to the abnormal end can be restored at the start of energization, and the reproducible portion can be restored.
  • the Recovery processing can be performed as a file format.
  • file destruction and data loss at the time of abnormal termination can be prevented at low cost.
  • the digital data recording / reproducing device is the digital data recording / reproducing device according to any one of claims 7 to 10, wherein digital broadcast is provided.
  • a digital broadcast receiving unit that receives the digital broadcast; and a controller that controls the file structure management unit based on charging information indicating whether or not the received digital broadcast is charged. If an abnormal end occurs, the controller discards the recorded data after the abnormal end is restored, and controls so as not to charge.
  • the digital broadcast even when an abnormal end such as a power failure occurs at the time of data recording, if the digital broadcast is not for a fee, the file until the interruption due to the abnormal end can be restored. If the digital broadcast whose recording was interrupted due to abnormal termination is a paid broadcast, the data recorded halfway is discarded. Charges can be made.
  • a digital data recording / reproducing apparatus is a digital data recording / reproducing apparatus for recording / reproducing digital data, wherein the digital data recording / reproducing apparatus includes a plurality of disk storage units for recording digital data; A file structure management unit for recording, in a different disk storage unit, a cluster in which data is stored and a file location table for managing connection information of the cluster.
  • FIG. 1 is a block diagram showing a configuration of a digital data recording / reproducing apparatus according to Embodiment 1 of the present invention.
  • FIG. 2 (a) is a diagram showing a file structure of the disk recording medium according to Embodiment 1 of the present invention when data is not recorded.
  • FIG. 2 (b) is a diagram showing a file structure when data is recorded on the disk recording medium according to the first embodiment of the present invention.
  • FIG. 2 (c) is a diagram showing a file structure at the end of data recording on the disk recording medium according to the first embodiment of the present invention.
  • FIG. 3 is a flowchart showing a digital data recording / reproducing method according to Embodiment 1 of the present invention.
  • FIG. 4 is a block diagram showing a configuration of a digital data recording / reproducing apparatus according to Embodiment 2 of the present invention.
  • FIG. 5 is a diagram showing a structure of a transport bucket according to Embodiment 2 of the present invention.
  • FIG. 6 is a flowchart showing a file restoration process at the time of restart of energization according to the second embodiment of the present invention.
  • FIG. 7 is a diagram for describing a data format of PES data according to the third embodiment of the present invention.
  • FIG. 8 is a flowchart showing a file restoration process at the time of restart of energization according to the third embodiment of the present invention.
  • FIG. 9 is a diagram showing a file structure of a disk recording medium according to Embodiment 4 of the present invention.
  • FIG. 10 is a diagram showing a data structure of a cluster according to the fourth embodiment of the present invention.
  • FIG. 11 (a) is a diagram showing a file structure at the time of abnormal termination such as a power failure according to Embodiment 4 of the present invention.
  • FIG. 11 (b) is a diagram showing a state of a cluster at the time of abnormal termination such as a power failure according to Embodiment 4 of the present invention.
  • FIG. 12 is a diagram showing a file restoration process when power is restored according to the fourth embodiment of the present invention.
  • FIG. 13 (a) is a diagram showing a configuration of a digital data recording / reproducing apparatus according to Embodiment 5 of the present invention.
  • FIG. 13 (b) is a diagram showing pay broadcast billing information according to the fifth embodiment of the present invention.
  • FIG. 14 is a flowchart showing the processing of the digital data recording / reproduction control unit according to the fifth embodiment of the present invention.
  • FIG. 15 is a block diagram showing a configuration of a digital data recording / reproducing apparatus according to Embodiment 6 of the present invention.
  • FIG. 16 is a diagram showing a configuration of a conventional uninterruptible power supply system.
  • FIG. 17 is a diagram showing a conventional file structure. BEST MODE FOR CARRYING OUT THE INVENTION
  • a digital data recording / reproducing method and a digital data recording / reproducing apparatus according to Embodiment 1 of the present invention will be described with reference to the drawings.
  • a recordable area in which recordable clusters are connected in advance is constructed on a disk recording medium, and when recording is completed, digital data from a recording start cluster to a recording end cluster is recorded.
  • a recording file As a recording file.
  • FIG. 1 is a block diagram showing the structure of a digital data recording / reproducing device according to the first embodiment.
  • the digital data recording / reproducing device 20 includes a data input / output unit 21, a file structure management unit 22, and a disk recording medium 23.
  • the data input / output unit 21 receives digital data from an externally connected digital data input device when receiving data, and outputs digital data to the file structure management unit 22. It receives digital data from 2 and outputs digital data to an externally connected digital data playback device.
  • the file structure management unit 22 manages the file structure of the disk recording medium 23, records digital data on the disk recording medium 23 when data is input, and reads digital data from the disk recording medium 23 when outputting data.
  • the disk recording medium 23 is a disk-shaped recording medium that stores digital data.
  • FIGS. 2 (a) to 2 (c) are diagrams showing the file structure of the disk recording medium 23.
  • FIG. 2 (a) to 2 (c) are diagrams showing the file structure of the disk recording medium 23.
  • the file structure of the disk recording medium 23 is composed of a root directory 101, a file allocation tape drive 102, and a cluster 103. Consists of
  • the root directory 101 holds the first cluster number of the recordable area, the name of the recorded data file, and the first cluster number where the data of the data file is stored.
  • the file allocation table 102 stores the connection relationship of the cluster 103 in the data file by storing the cluster number following the corresponding cluster in the corresponding cluster number position of the file allocation table 102. to manage.
  • the cluster 103 is a minimum access unit of the disk recording medium 23, and a continuous number is assigned as a logical block address, and digital data of a data file is stored.
  • FIG. 2 (a) is a diagram showing a file structure when data is not recorded.
  • FIG. 2 (a) there is no recorded data file in the directory 011, and there is a free area indicating a recordable area, and the free area has a cluster number of 0 0 2
  • the configuration starts with Note that FFFFF in the file allocation table 102 indicates that the cluster 103 following the relevant cluster does not exist and is the last cluster.
  • the file allocation table 102 is configured so that the Free Area starts from the cluster number 002 and is an area in which all clusters are connected in order.
  • FIG. 3 is a flowchart showing a digital data recording / reproducing method.
  • the file structure management unit 22 pre-stores the recording area of the disk recording medium 23 in advance as shown in FIG. 2 (a).
  • the file is constructed in such a way that the cluster numbers are connected (step S31). After building the file structure, start recording data.
  • Digital data is input to the data input / output unit 21 from an externally connected digital data input device (not shown).
  • the data input / output unit 21 outputs the digital data to the file structure management unit 22.
  • FIG. 2 (b) is a diagram showing a file structure at the start of data recording.
  • the first cluster number assigned to the Free Area of the root directory 101 at the time of starting data recording is stored in the first cluster number storage area of the data file Video. Copying, FFFF indicating that the assigned cluster 103 does not exist is stored in the first cluster number storage area of the Free Area indicating the recordable area.
  • the configuration of the file location table 102 starts with the data file Video i cluster number 0 02 and indicates the area where all clusters are connected in order. Become.
  • digital data such as video data is recorded from the head of the cluster 103 assigned to the data file Video at the start of recording (step S32).
  • FIG. 2 (c) shows the file structure at the end of data recording.
  • a Free Area indicating a recordable area is provided in the root directory 101.
  • the cluster number (in this case, 200 0) following the last recorded cluster 103 is stored in the first cluster number storage area of the data.
  • step S33 digital data from the recording start cluster to the recording end cluster is configured as a recording file (step S33).
  • an abnormal end such as a power failure occurs during data recording, for example, an abnormal end occurs while writing the cluster number 1 FFF.
  • the data files are connected in advance from the unrecorded cluster to the recorded clusters from cluster number 002 to cluster number 1 FFF and the unrecorded clusters after 2000. It is in a connected state.
  • the disk recording medium 23 having a file structure in which all recordable error clusters are connected in advance is used.
  • file structure management that stores an identifier indicating the last cluster in the last cluster where data was recorded, and stores the number of the cluster following the last cluster where data was recorded in the first cluster of the recordable area. Even if an abnormal termination such as a power failure occurs during digital data recording, the area where the digital data was recorded exists as a part of the file when power is restored. After recovery, data recorded from the start of recording to the abnormal end can be reproduced.
  • FFFFF is used as an identifier indicating that there is no recordable error, but another value that does not exist as a cluster number may be used.
  • the digital data recording / reproducing method according to the second embodiment is similar to the digital data recording / reproducing method according to the first embodiment.
  • a step for checking whether or not a synchronization byte is missing in the data of the cluster in order to obtain the first cluster number of the interrupted file is added.
  • the file structure of the disk recording medium according to the second embodiment is the same as the file structure of the disk recording medium according to the first embodiment, and is shown in FIGS. 2 (a) to 2 (c). Note that FFFF stored in the first cluster number storage area of the Free Area indicating the recordable area in FIG. 2 (b) indicates that data is being recorded in the second embodiment.
  • FIG. 4 is a block diagram showing a configuration of a digital data recording / reproducing device according to the second embodiment.
  • the digital data recording / reproducing device 24 includes a data input / output unit 21, a file structure management unit 25, and a disk recording medium 23.
  • the file structure management unit 25 further includes a file recovery processing unit 26. Configurations and operations other than those relating to the file structure management unit 25 and the file recovery processing unit 26 are the same as those in the first embodiment, and a description thereof will be omitted.
  • the file structure management unit 25 manages the file structure of the disk recording medium 23, records digital data on the disk recording medium 23 when data is input, and reads digital data from the disk recording medium 23 when outputting data. .
  • the file recovery processing unit 26 performs a normal end process from the start of data recording to the abnormal end when power supply is resumed when abnormal termination of data recording such as a power failure occurs during digital data recording. As in the case above, the recovery process is performed so that one record file is obtained.
  • FIG. 5 is a diagram showing a structure of a transport bucket which is a data format of digital broadcasting.
  • the transport bucket is composed of a transport header 201 as header information and a payload 202 as actual digital data.
  • the transport packet has a fixed length.
  • At the head of the transport header 201 there is a synchronization byte 203 for synchronizing.
  • Digital broadcasting is composed of data obtained by repeating this transport bucket.
  • FIG. 6 is a flowchart showing a file restoration process at the time of restart of energization. Unless otherwise stated, the processing is performed by the file recovery processing unit 26.
  • step S301 it is determined whether or not the processing was interrupted during recording by checking the top cluster number assigned to the Free Area indicating the recordable area in the root directory 101 of FIG. 2 (b). Is determined by checking whether FFFF indicates that recording is in progress. If the recording process is not interrupted, that is, if the first cluster number assigned to the Free Area is not FFFFF, the power supply restart process is terminated. If the recording process has been interrupted, that is, if the head cluster number of the Free Area is FFFFF indicating that recording is in progress, the process proceeds to step S302, and the energization restart process is continued.
  • step S302 the first cluster number of the recording interrupted file for which the connection of the file location table 102 does not end at the last cluster (FFFF) is obtained from the root directory 101. , A power rent cluster.
  • step S303 it is determined whether or not there is a missing synchronization byte 203 in the current cluster. If the synchronization byte 203 is missing, it is determined that recording has been interrupted in the current cluster, and the flow advances to step S304. If there is no missing of the synchronous byte 203, it is determined that the recording has not been interrupted in the current cluster, and the flow advances to step S307.
  • step S304 FFFFF meaning the last cluster is stored in the cluster number position of the file allocation table 102 corresponding to the current cluster.
  • step S305 the cluster number following the current cluster is obtained from the file allocation table 102, and is set as the leading free cluster.
  • step S306 the top of the Free Area in the Store the leading free cluster in the cluster number storage area. Then, the energization restart processing ends.
  • step S307 it is determined whether there is a cluster following the current cluster. If there is a cluster following the current cluster, the process proceeds to step S308. If there is no cluster following the current cluster, it is determined that the recording process has been performed up to the last cluster, and the energization restart process ends.
  • step S308 the current cluster is updated by acquiring the cluster number following the current cluster from the file location table 102 and using that cluster number as the current cluster. Return to 03 and repeat the check for sync byte 203.
  • the cluster number following the last recorded cluster number 1 FFF is used.
  • the value 200 is stored (step S306).
  • the file structure shown in FIG. 2 (c) can be restored to the same file structure as when recording has been completed normally.
  • digital recording is performed using the disk recording medium 23 having a file structure in which clusters of all recordable territories are connected in advance.
  • the digital data format to be recorded is described as a transport bucket.
  • the same operation can be performed for pack data by using the pack start code as a synchronization byte.
  • the means for obtaining the leading cluster number of the interrupted file may be determined not only based on whether or not there is a missing sync byte, but also based on the format information of other digital data.
  • the digital data recording / reproducing method according to the third embodiment differs from the digital data recording / reproduction method according to the second embodiment in that the step of checking whether or not a synchronization byte is missing in the cluster is the same as in the first embodiment. It is a step to check whether or not there is.
  • FIGS. 2 (a) to 2 (c) and FIG. 4 The file structure of the disk recording medium and the digital data recording / reproducing apparatus according to the third embodiment are shown in FIGS. 2 (a) to 2 (c) and FIG. 4, respectively.
  • the file structure is the same as that of the digital data recording / reproducing device, and the description is omitted.
  • FFFFF stored in the first cluster number storage area of the Free Area indicating the recordable area in FIG. 2 (b) indicates that data is being recorded in the third embodiment.
  • the file restoration processing unit 26 in FIG. 4 performs the file restoration processing by confirming the lack of the marker bit or the decrease in the PTS.
  • FIG. 7 is a diagram for explaining a data format of PES data which is a collection of payload portions of the transport bucket shown in FIG.
  • the PES data includes a bucket header 410, which is an information area of the PES, and bucket data 402, which is actual data.
  • Bucket header 4 0 1 Has a PTS 403 which is time management information of the reproduction output, and the PTS 403 has a value which increases in the order of data. Also, the PTS 403 has a power bit 404 that always takes a value of 1.
  • FIG. 8 is a flowchart showing a file recovery process at the time of restarting power supply.
  • Steps S501 and S502 and steps S503 to S508 are steps S301, S302, and steps S303 to S308 of the flowchart shown in FIG. 6 of the second embodiment, respectively. This is the step for performing the same processing as described above, and the description is omitted. Unless otherwise specified, the processing is performed by the file restoration processing unit 26.
  • step S503 it is determined whether or not the marker bit 404 is missing or the PTS 403 is reduced in the current cluster. If the marker bit 404 is missing or the PTS 403 is reduced, it is determined that recording has been interrupted in the current cluster, and the flow advances to step S504. If the marker bit 404 has not been lost and the PTS 403 has not been reduced, it is determined that recording has not been interrupted in the current cluster, and the flow advances to step S507.
  • Step S503 FFFF indicating the last cluster of the data file is stored at the position of the cluster number IFFF in the file allocation table 102 (step S504).
  • the cluster following the cluster number 1 FFF recorded last is used.
  • the number 2000 is stored (step S506). As a result, as shown in FIG. A similar file structure can be restored.
  • digital data can be recorded in advance using a disk recording medium having a file structure in which clusters of all recordable areas are connected.
  • the digital data format to be recorded is described as a transport bucket.
  • the present invention can be similarly implemented by using time information even for packed data.
  • an area for storing a file ID for identifying a data file is provided in each cluster, and a file recovery process is performed using the file ID.
  • the digital data recording / reproducing apparatus according to the fourth embodiment is the same as the digital data recording / reproducing apparatus according to the second embodiment, and is shown in FIG.
  • FIG. 9 is a diagram showing a file structure of the disk recording medium 23 according to the fourth embodiment.
  • the recording area of the disk recording medium 23 includes a root directory 601, a file location table 602, and a cluster 603.
  • the root directory 6001 stores the files stored on the disk storage medium 23. File name and the first cluster number where the data of the data file is stored.
  • the file allocation table 602 manages the connection relationship of the cluster 603 by storing the cluster number following the cluster at the corresponding cluster number position.
  • the cluster 60 3 is the minimum access unit of the disk recording medium 23, and consecutive numbers are assigned as logical block addresses, and digital data of a data file is stored.
  • the file name and the first cluster number are registered in the root directory 601 and the connection information of the cluster 603 is updated in the file allocation table 602, and each of the clusters 603 is updated. Record the data in However, in order to access the disk at high speed, the connection information of the cluster 603 is updated in the memory (not shown) of the file structure management unit 25 while writing data to the cluster 603, and the data is updated. When the writing is completed, that is, at the time of the file closing process, the connection information of the cluster 603 in the memory is written to the file allocation table 602 of the disk recording medium 23. Next, the detailed data structure of the cluster 603 will be described with reference to FIG.
  • FIG. 10 is a diagram showing the data structure of the cluster 603.
  • one cluster 603 includes recording information 701 for recording information at the time of recording digital data, and digital data 702, which is actual data.
  • the record information 701 includes a file ID 703 for identifying a data file and a connection cluster number 704 for storing a cluster number following the corresponding cluster.
  • a file ID 703 for identifying a data file
  • a connection cluster number 704 for storing a cluster number following the corresponding cluster.
  • the file ID703 a file in which year, month, hour, minute, and second of the recording start are represented by ASCII codes is used.
  • FIG. 11 (a) shows that the data file Video 1 is being recorded in the cluster number 004 of the cluster 603 in FIG. 9, that is, the file allocation table 602 is updated.
  • FIG. 9 is a diagram showing a state of a file structure in a case where an abnormal end such as a power failure has occurred before.
  • the root directory 801 and the cluster 803 are in a normal state, but the file allocation table 802 has a connection relationship. There is no state.
  • FIG. 11 (b) is a diagram showing a state of the cluster 803 when the processing is interrupted during recording.
  • the same recording start time is stored in the file ID 804 of each cluster to which the digital data 806 of the data file Video 1 has been written, and the connected cluster number 805 Indicates the cluster connection relation.
  • the connection cluster number 800 of the cluster 4 is “undefined” because the connection cluster number 805 of the cluster 4 has some abnormal cluster number, for example, the cluster number 10000. Indicates that it is stored.
  • FIG. 12 is a flowchart showing a file restoration process at the time of restart of energization. Unless otherwise stated, the processing is performed by the file recovery processing unit 26.
  • step S901 it is determined whether or not the processing was interrupted during recording in the file allocation table starting from the first cluster number of the data file Video1 in the root directory 801 in FIG. 11 (a). Check and determine the cluster connection of 802. Then, if the recording process is not interrupted, that is, if the connection relation of the file allocation table 802 is in a normal state, the power supply restart process is ended. On the other hand, if the recording process has been interrupted, the process proceeds to step S902.
  • step S902 the first cluster number of the recording suspension file is obtained from the rate directory 801 to be a current cluster, and the final cluster ID 804 is set as a target file ID.
  • step S903 the connection cluster number 805 of the cluster 803 of the current cluster is obtained, and is set as the next cluster.
  • step S904 if the file ID of the next cluster is different from the target file ID, it is determined that recording has been interrupted in the current cluster. Proceed to step S905. On the other hand, if the file ID 804 of the next cluster is the same as the target file ID, it is determined that data recording has not been interrupted in the current cluster, and the flow advances to step S906.
  • step S905 FFFF meaning the last cluster is stored in the cluster number position of the file allocation table 802 corresponding to the current cluster. Then, the energization restart processing ends.
  • step S906 the number of the next cluster is stored in the position of the current cluster of the file connection tape drive 802, the cluster connection relationship is restored, and the current cluster is updated to the value of the next cluster. . Then, the process returns to step S903, and the check of the final ID 804 in step S903 and step S904 is repeated.
  • a file recovery process at the time of restart of energization will be described using a specific example.
  • the file restoration process at the time of resumption of power supply if it is sequentially checked whether the file IDs of the current cluster and the next cluster are the same from the first cluster 00 2 of the data file Video 1, the cluster When the number 0000 is the current cluster, the file IDs of the current cluster and the next cluster become different (step S904). Then, FFFFF indicating the last cluster of the data file is stored at the position of the cluster number 004 of the finale location tape drive 802 (step S905).
  • the data file Videol can be recovered as a recording file, as in the case where the recording is normally completed as shown in FIG.
  • each cluster has a file ID for identifying a data file and a connection cluster indicating a connection relation of the cluster.
  • the file location table 602 of the data file recorded from the start of recording to the abnormal end when power is turned on can be restored. It can recover the reproducible part as a file format.
  • year, month, hour, minute, and second at the start of recording are used as the file ID, but a counter or the like that does not have reproducibility may be used.
  • the description has been made using “0 0 0 0” as the value of the file allocation table 802 in a state where there is no connection relation of the file allocation table, but it does not exist as a cluster number. Other values may be used.
  • the recordable area is described as all clusters. However, the recordable area may be assigned to some clusters, and the remaining clusters may be used as computer data recording areas. Les ,.
  • FFFF is used as an identifier indicating that there is no cluster following the corresponding cluster and the last cluster, but it does not exist as a cluster number. Is also good.
  • the digital data recording / reproducing apparatus uses the digital data recording / reproducing method according to any of the second to fourth embodiments, and when a pay broadcast is recorded, an abnormal termination such as a power failure occurs. Can also be dealt with appropriately.
  • FIG. 13 (a) is a diagram showing a configuration of a digital data recording / reproducing apparatus according to the fifth embodiment.
  • the digital data recording / reproducing apparatus includes a digital broadcast receiving section 1001, a decoder 1002, a digital data recording / reproducing control section 1003, and a disk storage section 100. 05 and a data output destination switch 106.
  • the digital data recording / reproduction control unit 1003 includes a data input / output unit 21, a file structure management unit 25, and a controller 27.
  • the file structure management unit 25 further includes a file recovery processing unit 26.
  • the configuration and operation of the data input / output unit 21, the file structure management unit 25, and the file recovery processing unit 26 are the same as those described in any of the second to fourth embodiments. Omitted.
  • the digital broadcast receiving unit 1001 receives the digital broadcast 1 OA, extracts the copy protection information, extracts the program specified by the user by demultiplexing, and, if necessary, decompresses the program based on the copy protection information. And extract 1 ⁇ B of digital data.
  • the digital data 10B of the program extracted by the digital broadcast receiving unit 1001 is output to the digital data recording / playback control unit 1003.
  • the decoder 1002 receives the digital data 10B from the digital data recording / reproduction control unit 1003, decodes and converts the digital data into analog data, and outputs video and audio.
  • the controller 27 of the digital data recording / reproducing control unit 1003 records the billing information 100D on the master card 1004, and specifies the data output destination switch 10006 only for reproduction, Alternatively, in the case of both playback and recording, an instruction is output to the file structure management unit 25 so that the digital data 10 B is output to the decoder 100 2, and the data output destination switch 1 0 6 In the case where the designation of “record” is only recording or both reproduction and recording, the digital data 10B is stored in the disk storage unit 1 by the digital data recording / reproducing method according to any of the second to fourth embodiments. An instruction is output to the file structure management unit 25 so as to be recorded in 05.
  • the controller 27 When the file recovery processing unit 26 detects that data recording has been abnormally terminated due to a power failure or the like after the start of energization, the controller 27 reads the file recorded halfway into the disk storage unit 1005. An instruction is output to the file structure management unit 25 to delete the program, and the corresponding program is deleted from the pay broadcast billing information 10D.
  • the master card 1004 records billing information 100D.
  • Digital data 10B is recorded in the disk storage unit 1005 in one of the file formats according to the second to fourth embodiments.
  • the data output destination switch 1006 indicates the type of usage when the user specifies the output destination of the received data to be used for playback only, recording only, or both playback and recording.
  • the designated signal 100C is output to the digital data recording / playback controller 1003.
  • FIG. 13 (b) is a diagram for explaining a billing information format in the master card 1004.
  • the billing information format includes a pay broadcast price 1007 that stores the viewing price, a viewing mode 1008 that identifies whether the content was reproduced or recorded during viewing, and a disc format.
  • a program file 109 stores a file name when recorded in the storage unit 1005.
  • the user of the digital data recording / reproducing apparatus selects the data output format in advance, that is, one of both reproduction and recording, reproduction only, and recording only, and selects the data output destination switch. Set to 106.
  • a digital broadcast sent from a broadcast station is first input to a digital broadcast receiving unit 1001. Then, the digital broadcast receiving unit 1001 extracts the copy protection information included in the digital broadcast, demultiplexes and extracts the program specified by the user, and if necessary, copies the copy protection information. The data is descrambled to extract digital data 10B and output it to the digital data recording / reproducing control unit 103.
  • the digital data recording / reproducing control unit 1003 records the billing information 100D in the master force 1004.
  • the data output destination switch 106 includes reproduction, the digital data 100B is output to the decoder 1002, and the data output destination switch 106 specifies recording. If it does, the digital data 10B is stored in the disk storage unit 1005.
  • the decoder 1002 decodes the digital data 10B and converts the digital data 10B into analog data, and outputs video and audio.
  • the recording of the digital data 100B in the disk storage unit 105 is performed by the digital data recording / reproducing method described in any of the second to fourth embodiments. Next, an operation of reproducing data recorded in the disk storage unit 105 will be described.
  • the digital data recording and playback control unit 1 When playing back from the disk storage unit 105, the digital data recording and playback control unit 1
  • analog data can be reproduced by reading the digital data 10B from the disk storage unit 1005 and transferring it to the decoder 1002.
  • FIG. 14 is a flowchart showing the processing of the digital data recording / reproducing control unit 103 when an abnormal end such as a power failure occurs during the recording of a pay broadcast program.
  • step S111 the file recovery processing unit 26 determines whether or not data recording has ended abnormally by using the digital data recording / reproducing method according to any of the second to fourth embodiments. If it has not been interrupted, the power resumption process ends. If the recording process has been interrupted, the process proceeds to step S112. In step S112, the file structure management unit 25
  • step S1.13 the controller 27 determines whether or not there is a program file 1009 of the pay-broadcast billing information that matches the interrupted file. If there is no matching program file 1009, it is determined that free broadcast recording is being performed, and the process proceeds to step S114. If there is a program file 109 matching the interrupted file name, the flow advances to step S115.
  • step S114 the file recovery processing unit 26 performs the recovery processing of the recording interrupted file by the digital data recording / reproducing method according to any of the second to fourth embodiments. Then, the energization restart processing ends.
  • step S115 the controller 27 checks the viewing mode 1008 stored in the master card 104. And the viewing mode 1 0 0 8 If only is recorded, the flow advances to step S116 to output an instruction to the file structure management unit 25 to delete the interrupted file in the disk storage unit 1005. Then, the file structure management unit 25 deletes the interrupted file in the disk storage unit. Then, the process proceeds to step S117, where the controller 27 deletes the corresponding program from the pay-broadcast accounting information, and ends the power-on restart process.
  • step S118 the controller 27 causes the file structure management unit 25 to erase the interrupted file in the disk storage unit 105. Output the command to Then, the file structure management unit 25 deletes the interrupted file in the disk storage unit 1005. Then, the process proceeds to step S119, and the price associated with the recording is reduced from the pay broadcast price 1007. Then, the energization restart processing ends.
  • the digital data recording / reproducing apparatus by recording the digital broadcast according to the file structure described in any of the second to fourth embodiments, abnormalities such as a power failure during data recording can be achieved. Even when the termination occurs, if the digital broadcast is not a paid one, the file until the interruption due to the abnormal termination can be restored. If the digital broadcast whose recording was interrupted due to abnormal termination is a paid broadcast, the data recorded halfway is discarded. Charges can be made.
  • the digital recording / reproducing apparatus includes a plurality of disk storage units, and records a cluster for storing digital data and a file location table indicating connection information of the clusters in another disk storage unit. To Thus, the load is reduced as compared with the case where a single disk storage unit is used, and high-speed disk access is possible.
  • FIG. 15 is a diagram showing a configuration of a digital data recording / reproducing apparatus according to the sixth embodiment.
  • the digital data recording / reproducing apparatus includes a data input / output unit 1221, a file structure management unit 122, a disk storage unit A123, and a disk storage unit B124.
  • the data input / output unit 1221 receives digital data from an externally connected digital data input device when receiving digital data, and outputs the data to the file structure management unit 1222. Receives data from the management unit 122 and outputs digital data to an externally connected digital data playback device.
  • the file structure management section 122 When digital data is input, the file structure management section 122 records digital data in the disk storage section A 1203 and the disk storage section B 1204, and when digital data is output, the disk storage section The digital data is read from A123 and the disk storage part B124.
  • Digital data is recorded in the disk storage unit A123 and the disk storage unit B124.
  • the file structure used in the disk storage unit A123 and the disk storage unit B1224 is the same as the file structure of the fourth embodiment, and is shown in FIG.
  • the file name and the first cluster number are registered in the root directory 601 and the connection information of the cluster 603 is updated in the file allocation table 602, and each area of the cluster 603 is updated. Record digital data in
  • the root directory 601 corresponding to the cluster B of the disk storage unit B 124 in FIG. 15 and the file allocation table 602 are stored in the cluster 603 of the disk storage unit B 1204. Disk storage unit where is stored Separately from this, it is stored in the storage area of the root directory 601 of the disk storage unit A123 and the file allocation table 602, and the cluster A of the disk storage unit A123 is stored.
  • the root directory 601 corresponding to the disk storage unit 602 and the file allocation table 602 are stored in a disk storage unit different from the disk storage unit in which the cluster 603 of the disk storage unit A 123 is stored. It is stored in the root directory 601 of the storage unit B124 and the storage area of the file allocation table 602.
  • a cluster storing digital data and a file location table indicating connection information of the cluster are recorded in different disk storage units. High-speed disk access is possible, and even if an abnormal end such as a power failure occurs during digital data recording, the data recorded from the start of recording to the abnormal end when power is restored is read as a normal file format be able to.
  • the root directory is also stored in a separate disk storage unit from the cluster.
  • the cluster and the file are not stored.
  • the allocation table may be stored in another disk storage unit.
  • the file structure of the disk storage unit A123 and the disk storage unit B124 may be a conventional one shown in FIG.
  • the data input / output units 21 and 1201 perform both data input and output, but are divided into a data input unit and a data output unit. You can.
  • the file structure management units 22 and 25, the file recovery processing unit 26, and the controller 27 of the digital data recording / reproducing apparatuses according to the first to sixth embodiments may be configured by a hard It may be composed of
  • the digital data in Embodiments 1 to 6 is video data, And / or audio data.
  • analog data is encoded as digital data in advance, so that analog data can be recorded as digital data by a digital data recording / reproducing method.
  • the digital data recording / reproducing method and the digital data recording / reproducing apparatus record or reproduce video data, audio data, or both data, It is suitable for recording data when an abnormal termination such as a power failure occurs.

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  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

Cette invention concerne un procédé d'enregistrement/reproduction de données numériques conçu pour empêcher qu'un dossier ne soit détruit et que des données ne se perdent en cas d'interruption due par exemple à une panne d'électricité pendant l'entregistrement et/ou la reproduction de données numériques sur un support d'enregistrement à disque ou à partir de ce support. Ce dispositif comprend une unité de gestion de structures de fichier (25) assurant l'enregistrement de données sur un support d'enregistrement disque doté d'une structure de fichier dans laquelle des grappes de données sont reliées les unes aux autres, et une unité de reconstitution de dossiers (26) dont la fonction est de reconstituer, à partir d'information sur le format des données, des données numériques d'un fichier d'enregistrement enregistrées au cours d'une période comprise entre le début d'un enregistrement et une interruption, après reconstitution après interruption.
PCT/JP2000/000843 1999-02-17 2000-02-16 Procede et dispositif d'enregistrement et de reproduction de donnees numeriques WO2000049503A1 (fr)

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KR100390486B1 (ko) * 2000-12-13 2003-07-07 엘지전자 주식회사 디지털 데이터 재생장치의 파일 이름 저장 방법
JP2007042255A (ja) * 2005-06-29 2007-02-15 Victor Co Of Japan Ltd 記録方法
US7680397B2 (en) 2004-09-27 2010-03-16 Victor Company Of Japan, Ltd. Method and apparatus for recording data on a recording disc, and method and apparatus for restoring data recorded on a recording disc
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KR100502711B1 (ko) * 2003-03-14 2005-07-20 주식회사 코원시스템 휴대용 정보 기록재생장치의 기록 데이터 복구방법
KR100967376B1 (ko) * 2003-09-08 2010-07-05 삼성전자주식회사 방송 신호 처리 장치 및 그 방송 신호 처리 장치에서의하드 디스크 드라이브 기록 재생 방법
KR100578085B1 (ko) * 2004-09-08 2006-05-10 엘지전자 주식회사 광 기록 매체의 재생성능 개선방법
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