CN1163830C - Digital data recording and reproducing method and digital data recording and reproducing device - Google Patents

Abstract

A method and a device for recording/reproducing digital data, capable of preventing a file destruction and data missing at an abort time such as a power outage during digital data recording/reproducing on/from a disk recording medium, the device comprising a file structure managing unit (25) for recording data onto a disk recording medium having a file structure in which recordable clusters are linked together, and a file restoring unit (26) for constructing, based on data format information, as a recording file digital data recorded during a period from a data recording start to an abort time after a restoration from the abort when the abort occurred.

Description

Digital data recording and reproducing method and digital data recording and reproducing device

technical field

The present invention relates to a digital data recording and reproducing method and a digital data recording and reproducing device for recording and reproducing digital data on a disk recording medium, in particular to a digital data recording and reproducing method for preventing file destruction and data loss at abnormal terminations such as power outages and the use of the digital data recording and reproducing method. A digital data recording and reproducing device for a digital data recording and reproducing method.

Background technique

Hitherto, as a method for preventing file destruction and loss during a power failure, a known method is to use a non-interruptible power supply that can temporarily supply power during a power failure, as disclosed in JP-A-8-255001.

Next, the configuration and operation of a conventional uninterruptible power supply system will be described with reference to FIG. 16 .

Fig. 16 is a diagram showing the configuration of a conventional uninterruptible power supply system.

The conventional uninterruptible power supply system has an input and output device 1302 for inputting and outputting data, a control computer 1301 that receives the input and output signals of the input and output device 1302 and outputs a control signal for controlling the process to the input and output device 1302, A non-interruptible power supply 1304 capable of temporarily supplying power during a power failure, and an operation check circuit 1303 that receives a commercial power supply interruption signal indicating the power failure state of the commercial power supply of the non-interruption power supply 1304 and determines that a power failure occurs when the commercial power supply signal continues for a certain period of time or longer. .

When the control computer 1301 receives a signal indicating that the operation check circuit 1303 has been judged to be a power failure, it closes the current file. In addition, the operation checking circuit 1303 monitors the abnormality of the power supply voltage, and when there is an abnormality, the automatic notification device 1305 for the telephone line makes an automatic notification.

In this way, according to the conventional non-interruption power supply system, when a power failure occurs, the control computer 1301 can close the currently used file, so that no damage to the currently used file or loss of data will occur when the power failure occurs.

However, as a storage medium of a digital data recording and reproducing device used at home, there is a tape medium represented by a VCR, but at present, a disk recording medium such as a magnetic disk and a magneto-optical disk capable of random access has been used instead of the tape medium.

In the conventional magnetic tape media, when a power failure occurs during recording, the image before the power failure is preserved, but in the case of a computer disk recording medium, if the recording end processing is incorrect, all will be lost from the beginning of recording. Image data from time to power failure.

Next, the reasons why file corruption and data loss occur at the time of power failure during recording to a computer disk recording medium will be described using FIG. 17 .

FIG. 17 is a diagram showing a file recording structure in a recording area of a disk recording medium used by a computer OS such as MS-Windows (manufactured by Microsoft Corporation).

The recording area of the disk recording medium is composed of a root directory 1401 , a file allocation table 1402 and clusters 1403 .

The root directory 1401 holds the names of files stored on the disk recording medium and the cluster number of the head of the files. The file allocation table 1402 holds connection information of the clusters 1403 constituting the file. The cluster 1403 is the smallest unit of recording and reproduction on the disk recording medium, and holds real data.

In the example of FIG. 17, the root directory 1401 indicates that a file named Data1 is stored on the disk recording medium starting from cluster number 0002, and the file allocation table 1402 indicates that Data1 is constituted in the order of cluster number 0002, cluster number 0003, and cluster number 0004. data. Therefore, real data representing Data1 is stored in the cluster number 0002, cluster number 0003, and cluster number 0004 areas of the cluster 1403. FFFF in the file allocation table 1402 is the cluster number indicating the last cluster of the file.

When recording data, first register the file name and the first cluster number in the root directory 1401, update the connection information of the cluster 1403 from the file allocation table 1402, and record real data in each area of the cluster 1403.

However, the root directory 1401 and the file allocation table 1402 are fixed on the disk recording medium, and each area of the cluster 1403 uses an area of the disk recording medium other than the root directory 1401 and the file allocation table 1402 .

When performing data recording, when writing to each area of the file allocation table 1402 and the cluster 1403, each time when writing to the cluster 1403, the cluster connection information of the file allocation table 1402 must be updated, so it is necessary to search for the disk record. The media's write head and thus the write speed are very slow.

Therefore, the method of updating the information of the file allocation table 1402 in the memory, writing data into the cluster 1403, and reflecting the information of the file allocation table 1402 on the disk recording medium at the time of data recording end processing, that is, file closing processing, is adopted.

In the process of recording to the above-mentioned disk recording medium, when a power failure occurs before the recording end process is performed, the file allocation table 1402 of the disk recording medium is not updated. In 1403, the connection information of the file allocation table 1402 representing the connection information of the cluster 1403 will be lost, so file damage and data loss will occur.

In addition, using the conventional uninterrupted power supply method as a measure against data loss, it would be an expensive configuration as a digital data recording and reproducing device for home use.

Contents of the invention

The present invention is proposed in view of the above problems, and an object of the present invention is to provide an inexpensive digital data recording and reproducing method and digital data recording and reproducing device that do not cause file corruption or data loss when abnormal termination such as power failure occurs during data recording.

The present invention provides a digital data recording and reproducing method for recording and reproducing digital data in units of clusters, which are the smallest unit of data recording on a disk recording medium. The first step of the file structure that connects the recordable clusters in advance; the second step of recording digital data from the beginning of the recordable clusters, and composing the digital data from the recording start cluster to the recording end cluster as a recording file Step 3 of .

The present invention provides a digital data recording and reproducing apparatus, characterized in that: it has a disk recording medium for storing digital data in units of clusters which are the smallest unit of data recording, and a file structure management unit for storing digital data in the above-mentioned disk recording medium. Read digital data on or from the above-mentioned disk recording medium to construct a file structure in which recordable clusters are connected to each other in advance before data recording starts. When data recording starts, digital data is recorded from the beginning of recordable clusters. At the end of recording, the digital data from the recording start cluster to the recording end cluster is constituted as a recording file.

According to the present invention, even if an abnormal end such as a power failure occurs during digital data recording, the area where the digital data is recorded will exist as a part of the file when the power is restarted. Data recorded so far can be cheaply prevented from file corruption and data loss when an abnormal end occurs.

According to the present invention, even if an abnormal end such as a power failure occurs during digital data recording, not only can the data recorded from the recording start to the abnormal end be reproduced when the power is restarted, but also the recordable part can be restored to the normal state. The file to be processed at the end of data logging is the same as the log file, so that file destruction and data loss at the time of abnormal end can be prevented at low cost.

According to the present invention, in digital data recording, even if an abnormal end such as a power failure occurs, not only can the data recorded from the recording start to the abnormal end be reproduced when the power is restarted, but also the file loss at the time of the abnormal end can be prevented at low cost. damage and loss of data.

According to the present invention, in digital data recording, even if an abnormal end occurs, the file allocation table of the data file recorded from the start of recording to the abnormal end can be restored at the start of power-on, so that the reproducible part can be processed as a file. Resume processing. In addition, file destruction and data loss at the time of abnormal termination can be prevented at low cost.

According to the present invention, even if abnormal termination such as power failure occurs during data recording, if the digital broadcast is not paid broadcast, the file before the interruption due to abnormal termination can be restored. Also, if the digital broadcast whose recording was interrupted due to abnormal termination is a pay broadcast, by discarding the data recorded before the en route, the pay broadcast can be not charged, so that the user can be charged appropriately.

According to the present invention, high-speed disk access is possible, and even when digital data recording is terminated abnormally such as a power failure, the data recorded from the recording start to the abnormal termination can be used as a normal file format when the power is restarted. And read in. In addition, it is possible to prevent the loss of files and data when an abnormal end occurs at low cost.

Description of drawings

Fig. 1 is a block diagram showing the configuration of a digital data recording and reproducing apparatus according to Embodiment 1 of the present invention.

Fig. 2(a) is a diagram showing the file structure when data is not recorded on the disk recording medium according to Embodiment 1 of the present invention.

Fig. 2(b) is a diagram showing a file structure during data recording on the disc recording medium according to the first embodiment of the present invention.

Fig. 2(c) is a diagram showing the file structure at the end of data recording on the disk recording medium according to Embodiment 1 of the present invention.

Fig. 3 is a flowchart showing a method for recording and reproducing digital data according to Embodiment 1 of the present invention.

Fig. 4 is a block diagram showing the configuration of a digital data recording and reproducing apparatus according to Embodiment 2 of the present invention.

Fig. 5 is a diagram showing the structure of a transport packet according to Embodiment 2 of the present invention.

Fig. 6 is a flowchart showing file recovery processing when power is restarted according to Embodiment 2 of the present invention.

Fig. 7 is a diagram for explaining the data format of PES data according to Embodiment 3 of the present invention.

Fig. 8 is a flowchart showing file restoration processing when power is restarted according to Embodiment 3 of the present invention.

Fig. 9 is a diagram showing a file structure of a disc recording medium according to Embodiment 4 of the present invention.

Fig. 10 is a diagram showing the data structure of a cluster according to Embodiment 4 of the present invention.

Fig. 11(a) is a diagram showing the file structure when the power failure or the like ends abnormally according to Embodiment 4 of the present invention.

Fig. 11(b) is a diagram showing the status of clusters when abnormal termination such as a power outage according to Embodiment 4 of the present invention.

Fig. 12 is a flowchart showing file recovery processing when power is restarted according to Embodiment 4 of the present invention.

Fig. 13(a) is a diagram showing the configuration of a digital data recording and reproducing apparatus according to Embodiment 5 of the present invention.

Fig. 13(b) is a diagram showing billing information for paid broadcasting according to Embodiment 5 of the present invention.

Fig. 14 is a flowchart showing the processing of a digital data recording/reproducing control unit according to Embodiment 5 of the present invention.

Fig. 15 is a block diagram showing the configuration of a digital data recording and reproducing apparatus according to Embodiment 6 of the present invention.

Fig. 16 is a diagram showing the configuration of a conventional uninterruptible power supply system.

Fig. 17 is a diagram showing a conventional file structure.

Detailed ways

Example 1.

Next, a digital data recording and reproducing method and a digital data recording and reproducing apparatus according to Embodiment 1 of the present invention will be described with reference to the drawings. In the digital data recording and reproducing method of the present embodiment 1, a recordable area in which recordable clusters are connected to each other is constructed on the disk recording medium in advance, and the digital data from the recording start cluster to the recording end cluster is constituted at the end of recording as log file.

FIG. 1 is a block diagram showing the configuration of a digital data recording and reproducing apparatus according to the first embodiment.

The digital data recording/reproducing device 20 has a data input/output unit 21 , a file structure management unit 22 and a disk recording medium 23 .

The data input and 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; The connected digital data reproduction machine outputs digital data.

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 during data input, and reads digital data from the disk recording medium 23 during data output.

The disk recording medium 23 is a disk-shaped recording medium that stores digital data.

2( a ) to 2( c ) are diagrams showing the file structure of the disk recording medium 23 .

In FIGS. 2( a ) to 2 ( c ), the file structure of the disk recording medium 23 is composed of a root directory 101 , a file allocation table 102 and clusters 103 .

The root directory 101 holds the head cluster number of the recordable area, the name of the data file to be recorded, and the head cluster number where the data of the data file is stored. The file allocation table 102 manages the connection relationship of the clusters 103 in the data file by storing the cluster number corresponding to the connection to the corresponding cluster number position of the file allocation table 102 . The cluster 103 is the minimum access unit of the disk recording medium 23, assigns consecutive numbers as logical block addresses, and stores digital data of a data file.

Fig. 2(a) is a diagram showing a file structure when data is not recorded.

In FIG. 2( a ), there are no recorded data files in the root directory 101, but there is a free area indicating a recordable area, and the free area has a structure starting from cluster number 0002. FFFF in the file allocation table 102 indicates that there is no cluster 103 connected to this cluster, but the final cluster.

As a file structure when data is not recorded, the free area starts from the cluster number 0002 and is an area in which all the clusters are sequentially connected to form the file allocation table 102 .

Next, the operation of recording data will be described using FIG. 1 , FIG. 2( a ) to FIG. 2( c ), and FIG. 3 .

Fig. 3 is a flowchart showing a method for recording and reproducing digital data.

First, when the disk recording medium 23 is formatted or before recording starts, the file structure management unit 22 constructs the recording area of the disk recording medium 23 as a file in which all cluster numbers are connected in advance as shown in FIG. 2( a). structure (step S31). After this file structure is constructed, recording of data is started.

The digital data is input to the device input data input/output unit 21 from an externally connected digital data not shown in the figure. 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.

In FIG. 2(b), when data recording starts, the file structure management unit 22 copies the head cluster number assigned to the free area of the root directory 101 to the head cluster number storage area of the data file video, and will indicate that there is no allocation. FFFF of the cluster 103 is stored in the head cluster number storage area of the free area indicating the recordable area.

Due to the change of the root directory 101, the structure of the file allocation table 102 becomes an area where all the clusters of the data file video display are sequentially connected from the cluster number 0002.

When data recording is performed, digital data such as image data is recorded from the head of the cluster 103 allocated to the data file video at the start of recording (step S32).

Fig. 2(c) is a diagram showing the file structure at the end of data recording.

In FIG. 2( c ), when data recording ends, the file structure management unit 22 stores FFFF indicating the last cluster of the data file in a position corresponding to the last cluster 103 recorded in the file allocation table 102 .

Then, in the root directory 101, the cluster number (in this case, 2000) connected to the last recorded cluster 103 is stored in the head cluster number storage area of the data indicating the free area of the recordable area. By doing so, the area starting from the head cluster allocated to the free area indicating the recordable area can be used for the next data file recording. In this way, the digital data from the recording head cluster to the recording end cluster is constituted as a recording file (step S33).

In the above-mentioned file structure, when an abnormal end such as a power failure occurs during data recording, for example, when an abnormal end occurs during writing of cluster number 1FFF, the file structure is in the state shown in Fig. 2(b), and the data file is The recorded clusters from cluster number 0002 to cluster number 1FFF and the unrecorded clusters after 2000 are pre-connected from the unrecorded state.

In this way, according to the digital data recording and reproducing method and digital data recording and reproducing apparatus of the present embodiment 1, with the disk recording medium 23 having a file structure in which all the clusters of the recordable area are connected in advance, the final cluster will be displayed when the recording ends. The identifier is stored in the cluster where data is recorded last, and the number of the cluster connected to the cluster where data is recorded last is stored in the file structure management unit in the first cluster of the recordable area, even if an abnormality such as a power failure occurs during digital data recording At the end, the area where the digital data is recorded can exist as a part of the file when the power is restarted, and the data recorded from the start of the recording to the abnormal end can be reproduced after the recovery from the abnormal end.

In the first embodiment, FFFF is used as an identifier indicating that there is no recordable area, but other values that do not exist as cluster numbers may be used.

Example 2.

Next, a digital data recording and reproducing method and a digital data recording and reproducing apparatus according to Embodiment 2 of the present invention will be described with reference to the drawings. In the digital data recording and reproducing method of the second embodiment, in the processing of the implementation side 1, a step of checking whether there is a missing sync byte in the data of the cluster is added in order to obtain the first cluster number of the interrupt file.

The file structure of the disc recording medium of the second embodiment is the same as that of the disc recording medium of the first embodiment, and is shown in FIGS. 2(a) to 2(c). FFFF stored in the head 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 the configuration of a digital data recording and reproducing apparatus according to the second embodiment.

The digital data recording/reproducing device 24 has 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 has a file restoration processing unit 26 . The structure and operation of parts other than the file structure management unit 25 and the file restoration processing unit 26 are the same as those of the first embodiment, so 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 during data input, and reads digital data from the disk recording medium 23 during data output.

The file recovery processing unit 26 performs recovery processing when, for example, abnormal end of data recording such as power failure occurs during recording of digital data, so that the data from the start of data recording to the abnormal end when the power is restarted are the same as when the normal end processing is performed. The same becomes a record file.

FIG. 5 is a diagram showing the structure of a transport packet as a data format of digital broadcasting.

In FIG. 5, the transport packet is composed of a transport header 201 as header information and a payload 202 of real data as digital data. Transport packets are of fixed length. At the beginning of the transport header 201, there is a sync byte 203 for synchronization. Digital broadcasting consists of data repeatedly transmitted in transport packets.

2 (a) to FIG. 2 (c) shown in the file structure of the disk recording medium 23 recording data in the course of recording data, such as a power failure or other abnormal termination of the file recovery process when the power is restarted will be described.

FIG. 6 is a flowchart showing file restoration processing when power is restarted. The processing is performed by the file restoration processing unit 26 unless otherwise specified.

First, in step S301, by checking whether the first cluster number assigned to the free area representing the recordable area in the root directory 101 of FIG. up. And, if the recording process is not interrupted, that is, if the first cluster number assigned to the free area is not FFFF, the power-on is terminated and the process is restarted. If the recording process is interrupted, that is, the first cluster number of the free area is FFFF indicating that recording is in progress, then step S302 is entered, and the power is continued to start processing again.

In step S302, from the root directory 101, the first cluster number of the unrecorded file connected to the final cluster (FFFF) in the file allocation table 102 is acquired as the current cluster.

In step S303, it is judged whether there is a sync byte 203 missing in the current cluster. If there is a loss of the sync byte 203, it is judged that there is a recording interruption in the current cluster, and it proceeds to step S304. If there is no loss of the sync byte 203, it is judged that there is no recording interruption in the current cluster, and it proceeds to step S307.

In step S304, FFFF representing the final cluster is stored in the cluster number position of the file allocation table 102 corresponding to the current cluster.

In step S305, the cluster number after the current cluster is obtained from the file allocation table 102 as the first free cluster.

In step S306, the first free cluster is stored in the first cluster number storage area of the free area of the root directory 101. And, the power-on is ended and the process is restarted.

In step S307, it is judged whether there is a cluster after the current cluster. If there is a cluster connected with the current cluster, it will go to step S308. If there is no cluster after the current cluster, it will be judged that the recording process has reached the final cluster, and the power-on will be terminated and the process will be started again.

In step S308, obtain the cluster number after the current cluster from the file allocation table 102, update the current cluster by using the cluster number as the current cluster, and return to step S303 to repeatedly check the sync byte 203.

Next, a specific example will be used to describe the file restoration process when the power is turned on again.

Assume, for example, that a power outage occurs during data recording to the cluster 103 with the cluster number 1FFF. At this time, in the file recovery process when the power is restarted, when it is confirmed whether there is a loss of the sync byte 203 according to the first cluster number of the recording interruption file, the sync byte 203 cannot be found with the cluster number 1FFF (step S303). Therefore, FFFF indicating the last cluster of the data file is stored in the position of the cluster number 1FFF in the file allocation table 102 (step S304). And, in the root directory 101, the cluster number 2000 after the last recorded cluster number 1FFF is stored in the head cluster number storage area of the free area indicating the recordable area, instead of FFFF indicating that it is being recorded (step S306). In this way, the same file structure as that at the end of normal recording shown in FIG. 2(c) can be restored.

In this way, according to the digital data recording and reproducing method and digital data recording and reproducing apparatus of the present embodiment 2, the recording of digital data is carried out by using the disk recording medium 23 of the file structure in which the clusters of all recordable areas are connected in advance, even when the digital data is recorded. In the event of an abnormal end such as a power failure, not only can the data recorded from the recording start to the abnormal end be reproduced when the power is turned on again, but also by making full use of the free area that can be recorded as an area, the recordable part can be restored to the same size. The file format is the same as the file for normal data logging end processing.

In the second embodiment, the recorded digital data is described as a transport packet, but it can be implemented similarly even if it is package data by using the package start code as a sync byte.

In addition, as a method of obtaining the head cluster number of the interrupted file, it is not only judged based on whether or not a sync byte is missing, but also judged based on format information of other digital data.

Example 3.

Next, a digital data recording and reproducing method and a digital data recording and reproducing apparatus according to Embodiment 3 of the present invention will be described with reference to the accompanying drawings. The digital data recording and reproducing method of the present embodiment 3 is to use the step of checking whether a sync byte is lost in the cluster in the embodiment 2 as a step of checking whether there is a loss of a marker bit or a reduction of the PTS in the cluster.

The file structure of the disk recording medium of the present embodiment 3 and the digital data recording and reproducing device are respectively the same as the file structure and the digital data recording and reproducing device of the embodiment 2 shown in Fig. 2 (a) to Fig. 2 (c) and Fig. 4, and omit its description. FFFF stored in the head cluster number storage area of the free area indicating the recordable area shown in FIG. 2(b) indicates that data is being recorded in the third embodiment. In addition, in the third embodiment, the file restoration processing unit 26 in FIG. 4 performs file restoration processing by confirming the loss of the flag bit or the decrease of 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 packet shown in FIG. 5 .

PES data is composed of a pack header 401 which is an information area of PES and pack data 402 which is real data. In the pack header 401, there is PTS 403 which is time management information for playback output, and the PTS 403 is a value that increases in the order of data. In addition, there is always a flag bit 404 which takes a value of 1 in the PTS 403 .

Next, the file restoration process at the time of resumption of power supply when an abnormal end such as a power failure occurs during data recording will be described.

FIG. 8 is a flowchart showing file restoration processing when power is restarted. Steps S501 , S502 and steps S503 to S508 are steps in which the same processing is performed as steps S301 , S302 and steps S303 to S308 shown in FIG. 6 of the second embodiment, respectively, and description thereof will be omitted. In addition, the processing is performed by the file restoration processing unit 26 unless otherwise specified.

In step S503, it is judged whether there is a loss of marker bit 404 or a decrease of PTS 403 in the current cluster. If there is a loss of the marker bit 404 or a decrease of the PTS 403, it is judged that there is a recording interruption in the current cluster, and it proceeds to step S504. If there is no loss of the flag bit 404 or decrease of the PTS 403, it is determined that there is no recording interruption in the current cluster, and the process proceeds to step S507.

Next, a specific example will be used to describe the file restoration process when the power is turned on again.

Assume that, for example, a power outage occurs during data recording to the cluster 103 with the cluster number 1FFF. At this time, in the file recovery process when the power is restarted, when it is confirmed whether the PTS 403 is normal based on the first cluster number of the recording interrupted file, the PTS 403 is abnormal in the cluster number 1FFF (step S503). Therefore, FFFF indicating the last cluster of the data file is stored in the position of the cluster number 1FFF in the file allocation table 102 (step S504). In addition, in the root directory 101, the cluster number 2000 following the last recorded cluster number 1FFF is stored in the head cluster number storage area of the free area indicating the recordable area, instead of FFFF indicating that recording is in progress. (step S506). In this way, the same file structure as that at the end of normal recording shown in FIG. 2(c) can be restored.

In this way, according to the digital data recording and reproducing method and digital data recording and reproducing apparatus of the present embodiment 3, the recording of digital data is carried out by using the disc recording medium 23 of the file structure in which the clusters of all recordable areas are connected in advance. In the event of an abnormal end such as a power failure, not only can the data recorded from the recording start to the abnormal end be reproduced when the power is turned on again, but also by making full use of the free area that can be recorded as an area, the recordable part can be restored to the same size. The file format is the same as the file for normal data logging end processing.

In the third embodiment, the recorded digital data is described as a transport packet, but even package data can be implemented similarly by using time information.

In addition, in Embodiments 2 and 3, FFFF is used as an identifier indicating that it is being recorded, but other values that do not exist as cluster numbers may be used.

Example 4.

Next, a digital data recording and reproducing method and a digital data recording and reproducing apparatus according to Embodiment 4 of the present invention will be described with reference to the drawings. In the digital data recording and reproducing method of the fourth embodiment, an area for storing a file ID for identifying a data file is provided in each cluster, and file recovery processing is performed based on the file ID.

The digital data recording and reproducing device of the fourth embodiment is also the same as the digital data recording and reproducing device of the second embodiment, as shown in FIG. 4 .

FIG. 9 is a diagram showing the file structure of the disk recording medium 23 according to the fourth embodiment.

In FIG. 9 , the recording area of the disk recording medium 23 is composed of a root directory 601 , a file allocation table 602 and clusters 603 .

The root directory 601 holds the name of the file stored on the disk recording medium 23 and the head cluster number of the data storing the file name. The file allocation table 602 manages the connection relationship of the cluster 603 by storing the cluster number following the cluster in the corresponding cluster number position. The cluster 603 is the minimum access unit of the disk recording medium 23, and consecutive numbers are allocated as logical block addresses, and digital data of data files are stored.

When recording data, the file name and the first cluster number are registered in the root directory 601 , the connection information of the cluster 603 is updated in the file allocation table 602 , and data is recorded in each area of the cluster 603 . However, in order to perform disk access at a high speed, the connection information of the cluster 603 is updated in a memory (not shown) included in the file management unit 25, and data writing into the cluster 603 is executed. In the file closing process, the connection information of the cluster 603 in the memory is written into the file allocation table 602 of the disk recording medium 23 .

Next, the detailed data structure of the cluster 603 will be described using FIG. 10 .

FIG. 10 is a diagram showing the data structure of the cluster 603 .

In FIG. 10 , one cluster 603 is composed of recording information 701 for recording information when digital data is recorded, and digital data 702 which is real data. The log information 701 is composed of a file ID 703 for identifying a data file and a connection cluster number 704 for storing the cluster numbers after the cluster. As the file ID 703, in the fourth embodiment, the year, month, hour, minute, and second at which the recording started is expressed in ASCII codes.

11( a ) is a diagram showing the state of the file structure when an abnormal end such as a power failure occurs during the recording of the data file video 1 to the cluster number 0004 of the cluster 603 in FIG. 9 , that is, before the file allocation table 602 is updated.

In FIG. 11(a), the root directory 801 and the cluster 803 are in a normal state, but the file allocation table 802 is in an unconnected state.

FIG. 11(b) is a diagram showing the state of the cluster 803 when the recording process is interrupted.

In FIG. 11( b ), in the file ID 804 of each cluster in which the digital data 806 of the data file video 1 is written, all the same recording start times are stored, and the cluster connection relationship is stored in the connection cluster number 805 . The reason why the connection cluster number 805 of the cluster 4 is "indeterminate" indicates that some abnormal cluster number such as cluster number 1000 is stored in the connection cluster number 805 of the cluster 4 .

Next, the file restoration process at the restart of power-on will be described using FIG. 12 .

FIG. 12 is a flowchart showing file restoration processing when power is restarted. The processing is performed by the file restoration processing unit 26 unless otherwise specified.

First, in step S901, check the cluster connection relationship of the file allocation table 802 from the head cluster number of the data file video 1 in the root directory 801 of FIG. And, if the recording process is not interrupted, that is, if the connection relationship of the file allocation table 802 is in a normal state, the power-on is terminated and the process is restarted. On the other hand, if the recording process is interrupted, it goes to step S902.

In step S902, the head cluster number of the recording interrupted file is obtained from the root directory 801 as the current cluster, and the file ID 804 of the head cluster is set as the target file ID.

In step 903, the connection cluster number 805 of the cluster 803 of the current cluster is acquired as the subsequent cluster.

In step S904, if the file ID 804 of the subsequent cluster is different from the target file ID, it is determined that there is a recording interruption in the current cluster, and the process proceeds to step S905. On the other hand, if the file ID 804 of the subsequent cluster is the same as the target file ID, it is judged that there is no data recording interruption in the current cluster, and the process proceeds to step S906.

In step S905, FFFF representing the final cluster is stored in the cluster number position of the file allocation table 802 corresponding to the current cluster. And, the power-on is ended and the process is restarted.

In step S906, the number of the subsequent cluster is stored in the position of the current cluster in the file allocation table 802, the connection relationship of the clusters is restored, and the value of the current cluster is updated to the value of the subsequent cluster. And, returning to step S903, anticorrosion checks the file ID 804 in steps S903 and S904.

Next, a specific example will be used to describe the file restoration process when the power is turned on again.

Assume that, for example, a power outage occurs during data recording to cluster 803 of cluster number 0004. At this time, in the file restoration process when the power is turned on again, when it is confirmed whether the file IDs of the current cluster and the subsequent cluster are the same from the first cluster 0002 of the data file video 1, if the cluster number 0004 is the current cluster, the current cluster and the subsequent cluster The file IDs of the clusters are different (step S904). Therefore, FFFF indicating the last cluster of the data file is stored in the position of the cluster number 0004 in the file allocation table 802 (step S905). In this way, the data file VIdeo1 can be restored to the same recorded file as that at the end of normal recording shown in FIG. 9 .

In this way, according to the digital data recording and reproducing method and digital data recording and reproducing apparatus of the present embodiment 4, by storing the file ID for identifying the data file and the connection cluster number representing the connection relationship of the clusters in each cluster, even in the digital data If abnormal end occurs during recording, the file allocation table 602 of the data files recorded from the recording start to the abnormal end can also be restored when the power is turned on again, so that the reproducible part can be restored as a file format.

In Embodiment 4, the year, month, hour, minute, and second at the start of recording is used as the file ID, but a non-reproducible counter may also be used.

In the fourth embodiment, "0000" is used as the value of the file allocation table 802 in the state where there is no connection relation of the file allocation table, but other values that do not exist as cluster numbers may be used.

In addition, in Embodiments 1 to 4, all the clusters were described as the recordable areas, but it is also possible to allocate the recordable areas to some clusters and use the remaining clusters as computer data recording areas.

In addition, in Embodiments 1 to 4, FFFF is used as an identifier indicating that there is no cluster following the cluster but the last cluster, but other values that do not exist as cluster numbers may be used.

Example 5.

Next, a digital data recording and reproducing apparatus according to Embodiment 5 of the present invention will be described with reference to the drawings.

The digital data recording and reproducing apparatus of the fifth embodiment employs the digital data recording and reproducing method described in any one of the embodiments 2 to 4, and can take appropriate measures even if an abnormal termination such as a power failure occurs when recording paid broadcasting.

Fig. 13(a) is a diagram showing the configuration of a digital data recording and reproducing apparatus according to the fifth embodiment.

In FIG. 13( a ), the digital data recording and reproducing apparatus has a digital broadcast receiving unit 1001 , a decoder 1002 , a digital data recording and reproducing control unit 1003 , a disk storage unit 1005 and a data output destination switcher 1006 . The digital data recording/playback control unit 1003 has a data input/output unit 21 , a file structure management unit 25 and a controller 27 . The file structure management unit 25 further has a file restoration processing unit 26 . The structure and operation of the data input/output unit 21, the file structure management unit 25, and the file restoration processing unit 26 are the same as those described in any one of Embodiments 2 to 4, and their descriptions are omitted.

The digital broadcast receiving unit 1001 receives the digital broadcast 10A, extracts the copy protection information, and at the same time, separates the signal, extracts the program specified by the user, and performs disc search according to the copy protection information if necessary, and extracts the digital data 10B. The digital data 10B of the program fetched 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/playback control unit 1003, decodes it, converts it into analog data, and outputs video and audio.

The controller 27 of the digital data recording/playback control section 1003 records the billing information 10D in the main card 1004, and at the same time, the designation of the data output destination switcher 1006 is to the file structure management section when only playback or playback and recording are performed. 25 output command, in order to output the digital data 10B to the decoder 1002, the designation of the data output destination switcher 1006 is to output the command to the file structure management part 25 when only recording or reproduction and recording are performed, in order to use The digital data recording and reproducing method described in any one of Embodiments 2 to 4 records the digital data 10B in the disk storage unit 1005 .

In addition, when the file recovery processing unit 26 detects that data recording has ended abnormally due to a power outage or the like after the start of power-on, the controller 27 outputs a command to the file structure management unit 25 to delete files in the middle of recording in the disk storage unit 1005, The program is thereby deleted from the paid broadcast accounting information 10D.

Billing information 10D is recorded in the main card 1004 .

In the disk storage unit 1005, the digital data 10B is recorded in any one of the file formats of the second to fourth embodiments.

The data output destination switcher 1006, when the user designates the output destination of the received data as any one of the use forms of reproduction only, recording only, or both reproduction and recording, sends the designation signal 10C indicating the use form to digital data recording and reproduction. The control unit 1003 outputs.

FIG. 13( b ) is a diagram for explaining the format of the charge information in the main card 1004 .

In Fig. 13 (b), the billing information format consists of the paid broadcast price 1007 for storing the viewing price, the viewing format 1008 for identifying whether it is reproduced or recorded when viewing, and the file name when storing and recording in the disk storage unit 1005. The program file 1009 is constituted.

Next, the operation of the digital data recording and reproducing apparatus will be described.

First, the case of receiving the digital broadcast 10A, reproducing the broadcast, or recording the broadcast will be described.

Before receiving the broadcast, the user of the digital data recording/reproducing apparatus selects in advance the data output format, ie, both reproduction and recording, reproduction only, and recording only, and sets the data output destination switcher 1006 .

A digital broadcast transmitted from a broadcast station is first input to the digital broadcast receiving unit 1001 . And, the digital broadcast receiving unit 1001 extracts the copy protection information included in the digital broadcast, simultaneously performs signal separation, extracts a program designated by the user, and if necessary, performs a disk search based on the copy protection information, extracts the digital data 10B, and records the digital data 10B in the digital data. output from the regeneration control unit 1003.

The digital data recording/playback control unit 1003 records the billing information 10D in the master card 1004 . In addition, the designation of the data output destination switcher 1006 at the time of reproduction is to output the digital data 10B to the decoder 1002, and the designation of the data output destination switcher 1006 at the time of recording is to store the digital data 10B in the disk storage unit. 1005 in.

When the digital data 10B is output to the decoder 1002, the decoder 1002 decodes the digital data 10B, converts it into analog data, and outputs video and audio.

The recording of the digital data 10B in the disk storage unit 1005 is performed by the digital data recording and reproducing method described in any one of the second to fourth embodiments.

Next, the operation of reproducing data recorded in the disc storage unit 1005 will be described.

When playing back from the disc storage unit 1005, the digital data recording and playback control unit 1003 reads the digital data 10B from the disc storage unit 1005 and transmits it to the decoder 1002 to reproduce the analog data.

Next, the processing of the digital data recording/playback control unit 1003 when recording of a paid broadcast program ends abnormally due to a power outage or the like will be described using FIG. 14 .

FIG. 14 is a flowchart showing the processing of the digital data recording/playback control unit 1003 when the recording of a paid broadcast program ends abnormally due to a power outage or the like.

First, in step S111, the file recovery processing unit 26 judges whether the data recording has ended abnormally by using any one of the digital data recording and reproducing methods in Embodiments 2 to 4. If the recording process is not interrupted, the power-on restart process is terminated. If the recording process is interrupted, it goes to step S112.

In step S112, the file structure management unit 25 acquires the name of the data file recorded in the middle of the disk storage unit 1005 as an interrupt file.

In step S113, the controller 27 judges whether or not there is a file coincident with the interrupt file in the program file 1009 of the paid broadcast billing information. If there is no consistent program file 1009, it is determined that it is not in the broadcast record, and enters step S115.

In step S114, the file recovery processing unit 26 uses any one of the digital data recording and reproduction methods in Embodiments 2 to 4 to perform recovery processing of the recording interrupted file. And, the power-on is ended and the process is restarted.

At step S115, the controller 27 checks the audiovisual form 1008 stored in the master card 1004. And, when the audio-visual format 1008 is only video recording, the process proceeds to step S116, and a command is output to the file structure management unit 26 to delete the interrupted file in the disk storage unit 1005. Then, the file structure management unit 25 deletes the interrupt file in the disk storage unit. Then, the process proceeds to step S119, and the video recording price is subtracted from the paid broadcast price 1007. And, the power-on is ended and the process is restarted.

In this way, according to the digital data recording and reproducing apparatus of the fifth embodiment, by utilizing the file structure described in any one of the second to fourth embodiments to record digital broadcasting, even when an abnormal end such as a power failure occurs during data recording, if the digital broadcasting is not By broadcasting for a fee, it is possible to resume a file that was interrupted due to an abnormal end. Also, if the digital broadcast whose recording was interrupted due to abnormal termination is a paid broadcast, by discarding the data recorded up to the middle, the paid broadcast can be not charged, and the user can be charged appropriately.

In Embodiment 5, the case where the recorded data is unconditionally discarded when the recording of the paid broadcast program ends abnormally is described, however, it is also possible to introduce charging according to the user's judgment whether to keep the data recorded in the middle.

Example 6.

Next, a digital data recording and reproducing apparatus according to Embodiment 6 of the present invention will be described with reference to the drawings.

The digital data recording and reproducing apparatus of the present embodiment 6 has a plurality of disc storage units, and by recording the clusters storing digital data and the file allocation table representing the connection information of the clusters in different disc storage units, it can be compared with a single disc storage. The load on the part is lightened, so that high-speed disk access can be performed.

Fig. 15 is a diagram showing the configuration of a digital data recording and reproducing apparatus according to the sixth embodiment.

The digital data recording and reproducing apparatus has a data input/output unit 1201 , a file structure management unit 1202 , a disk storage unit A 1203 , and a disk storage unit B 1204 .

The data input/output unit 1201 receives digital data from an externally connected digital data input device when digital data is received, and outputs the data to the file structure management unit 1202, and receives data from the file structure management unit 1202 when performing digital data reproduction, and sends the data to the file structure management unit 1202. An externally connected digital data reproducing device outputs digital data.

The file structure management unit 1202 records digital data in the disk storage unit A1203 and the disk storage unit B1204 when digital data is input, and reads digital data from the disk storage unit A1203 and disk storage unit B1204 when digital data is output.

In the disk storage unit A1203 and the disk storage unit B1204, digital data is stored. The file structure used in the disk storage unit A1203 and the disk storage unit B1204 is the same as that of the fourth embodiment, as shown in FIG. 9 .

Next, the operation of recording digital data to the disk storage unit A1203 and the disk storage unit B1204 will be described.

When recording data, the file name and the first cluster number are registered in the root directory 601, the connection information of the cluster 603 is updated from the file allocation table 602, and digital data is recorded in each area of the cluster 603.

Store the root directory 601 and the file allocation table 602 corresponding to the cluster B of the disk storage unit B 1204 in FIG. In the storage area of the table 602, the root directory 601 corresponding to the cluster A of the disk storage unit A1203 and the file allocation table 602 are stored in the root directory of the disk storage unit B1204 different from the disk storage unit storing the cluster 603 of the disk storage unit A1203. 601 and the storage area of the file allocation table 602.

In this way, according to the digital data recording and reproducing method of the sixth embodiment, by recording the cluster storing digital data and the file allocation table representing the connection information of the cluster in different disk storage units, high-speed disk access can be performed, and Even when digital data recording is abnormally terminated due to a power failure or the like, the data recorded from the start of recording to the abnormal end can be read as a normal file format.

In Embodiment 6, an example is described in which the root directory and clusters are also stored in a different disk storage unit. However, even if the root directory and clusters are stored in the same disk storage unit, the cluster and file allocation table can also be stored in the same disk storage unit. in a different disk storage unit.

In addition, the case where two disk storage units are used has been described, but three or more disk storage units may be used if clusters and file allocation tables are stored in different disk storage units.

In addition, the file structure of the disk storage unit A1203 and the disk storage unit B1204 may be the conventional format shown in FIG. 17 .

In Embodiments 1 to 6, the data input and output units 21 and 1201 perform two operations of data input and output, but they may be divided into two parts, a data input unit and a data output unit.

In addition, the file structure management units 22 and 25, the file recovery processing unit 26 and the controller 27 of the digital data recording and reproducing apparatuses of the first to sixth embodiments may be configured by hardware or by software.

In addition, the digital data in Examples 1 to 6 are image data and audio data, or data including any one of them.

In addition, in Embodiments 1 to 4 and Embodiment 6, by encoding analog data into digital data in advance, analog data can be recorded as digital data by a digital data recording and reproducing method.

As mentioned above, the digital data recording and reproducing method and digital data recording and reproducing apparatus of the present invention are for recording or reproducing image data, audio data or both data, and are suitable for use when data recording is abnormally terminated due to a power failure or the like. Recording of data.

Claims (9)

1. One kind with as the record least unit of data on the disc record media bunch be the digital data record renovation process that unit carries out record regenerating to digital data, it is characterized in that: comprise

   On above-mentioned disc record media, construct the 1st step of bunch interconnective file structure that before data recording begins, can write down in advance;

   From can write down bunch beginning opening entry numerical data the 2nd step and

   Numerical data that will be from record beginning bunch to end of record (EOR) bunch constitutes the 3rd step of log file.
2. 2. by the described digital data record renovation process of claim 1, it is characterized in that: also comprise

   When abnormal ending takes place because of having a power failure in data recording in the data recording of above-mentioned the 2nd step way, after energising once more, detect data recording abnormal ending step and

   Format information according to numerical data will constitute the step of log file from data recording begins to be write down till abnormal ending numerical data.
3. 3. by the described digital data record renovation process of claim 2, it is characterized in that: the format information of above-mentioned numerical data is the sync byte of transmission package.
4. 4. by the described digital data record renovation process of claim 2, it is characterized in that: the format information of above-mentioned numerical data is a temporal information.
5. 5. a digital data record regenerating unit is characterized in that: have

   With as the record least unit of data bunch be unit storage numerical data disc record media and

   File structure management department, numerical data stored on the above-mentioned disc record media or reading number data from the above-mentioned disc record media, construct bunch interconnective file structure that before data recording begins, can write down in advance, when data recording begins from can write down bunch beginning opening entry numerical data, when data recording finishes, will constitute log file from the numerical data that record beginning bunch begins till the end of record (EOR) bunch.
6. 6. by the described digital data record regenerating unit of claim 5, it is characterized in that: above-mentioned file structure management department has file and recovers handling part, when abnormal ending takes place because of having a power failure in data recording in the record way of numerical data, after energising once more, will constitute record data from the numerical data that data recording begins to be write down till abnormal ending according to the format information of numerical data.
7. 7. by the described digital data record regenerating unit of claim 6, it is characterized in that: above-mentioned format information is the sync byte of transmission package.
8. 8. by the described digital data record renovation process of claim 6, it is characterized in that: above-mentioned format information is a temporal information.
9. 9. press the described digital data record regenerating unit of arbitrary claim of claim 6～8, it is characterized in that: and then have the digital broadcasting acceptance division of receiving digital broadcast, control the controller of above-mentioned file structure management department with the charge information that according to the digital broadcasting that received of expression whether is charging broadcast, when in receiving the charge digital broadcasting, the abnormal ending of data recording having taken place, after abnormal ending recovers, discard data recording and do not charge thereby above-mentioned controller just is controlled to be.

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