JP2004127506A - Information recording medium, video signal recording device using the same, and video signal reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a compact video recording/reproducing device which uses a compact (e.g., diameter of 8cm) optical disk, and to playback the optical disk recorded by the device even on a DVD video player. <P>SOLUTION: A mark for discriminating recordable and rewritable optical disk types from each other is written beforehand in a cartridge or a disk, and a means is disposed in the recording/reproducing device to detect the mark, whereby the type of an optical disk is determined. Information written on the optical disk is similar in logical structure to the optical disk of a DVD video. Further, a means is disposed to change a method for generating the file management information of the recordable optical disk so as to inhibit access to an indicated position based on user's erasure instruction. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a video signal recording device and a reproducing device, and more particularly to a video signal recording device and a reproducing device using a small optical disc as an information recording medium, and an optical disc used for the same.

記録 In recent years, the recording density of optical disk devices has been remarkably improved, and the recording density of data usable by users per unit area is increasing at an annual rate of 40%. As a result, in a DVD (digital versatile disk) system using an optical disk having a diameter of 12 cm, it is possible to record 4.7 GB of data on one side as a DVD-ROM (read only memory: additional recording is impossible), and it is possible to perform additional recording only once. A system has been developed that can record 3.9 GB data as a DVD-R capable of recording data, and can record 2.6 GB data as a DVD-RAM (random access memory: rewritable any number of times).

On the other hand, image information compression technology, which reduces the amount of information and minimizes deterioration of moving images due to the development of image processing technology, has also advanced remarkably. In particular, the practical use of the MPEG2 image compression algorithm by MPEG (Motion Picture Experts Group) has made it possible to record and reproduce moving images of sufficient image quality at a low rate of 4 to 5 Mbps.

As a result, it has become possible to record moving images for more than 2 hours on the 4.7 GB DVD ROM described above, and DVD video players using such discs have been released.

(4) As described above, since a long-time moving image can be recorded on an optical disk, it is possible to record a moving image for a practically sufficient time with a device using a smaller optical disk.

The present invention has been made in view of the above circumstances, and has as its object to realize a small-sized video recording / reproducing apparatus using a small-sized (for example, 8 cm in diameter) optical disc. Further, it is intended that the optical disc recorded by this apparatus can be reproduced by the DVD video player described above. It is also intended to improve the usability of the user.

In such a video signal recording / reproducing apparatus, it is better to use both a write-once type and a rewritable type as an optical disk. Although the write-once type is not rewritable, it has features such as high recording density and the ability to record a long moving image on the same disk, and is generally less expensive than the rewritable type. This is because they have different characteristics that they can be freely rewritten and that the image can be retaken. Therefore, a first problem is to make it possible to use optical disks of different types in one device.

2The second problem is to enable the DVD-Video player to reproduce the optical disk written by the present apparatus. A third problem is to make it impossible to see (erase) an unfavorable place even when a write-once optical disc is used.

In order to solve the first problem, a mark for distinguishing the type of a write-once type and a rewritable type optical disk is written in a cartridge or a disk in advance, and a means for detecting the mark is provided in a recording / reproducing apparatus, and The type can be determined. Further, a means for displaying the discrimination result on the recording / reproducing apparatus is provided so that the user does not make a mistake. Further, the recording / reproducing apparatus is provided with a means for appropriately controlling each optical disc, and performs separate control according to the discrimination result. These made it possible to use optical disks of two different types.

情報 In order to solve the second problem, the information written on the optical disc has the same logical structure as the DVD video optical disc. Therefore, a means for simultaneously recording a recording format called UDF (Universal Disk Format) and ISO 9660 standard of ISO (International Organization for Standardization) as file management information is provided. Furthermore, if the optical disc has an unrecorded area, the DVD video player is likely to malfunction at the boundary between the recorded area and the unrecorded area. Therefore, a means for recording a special signal at the boundary to prevent the malfunction is provided. . When this signal is recorded, the area in which the original video signal can be recorded is reduced. Therefore, the number of times of writing this signal is reduced. Therefore, a means for automatically recording this signal when ejecting the optical disk or when the remaining battery power is low is provided. It is also possible to prevent the signal from being recorded even if the optical disk is taken out halfway. In this way, even if the optical disk is taken out halfway and then inserted into the device again and recorded, if there is no data left to create the previous file management information, the final file management information can be created. Therefore, means for recording data for creating file management information on an optical disk is provided. With this configuration, it is possible to record file management information that can be finally reproduced by the DVD video player.

In order to solve the third problem, there is provided means for changing the method of generating the file management information of the write-once optical disc so that the designated position cannot be accessed by the user's erasure instruction. In this way, in general, playback becomes impossible, but for security, a means for destroying data by overwriting meaningless data is also provided, and it is possible to completely erase data. .

According to the present invention, it is possible to realize a video signal recording device that can selectively use a write-once optical disk and a rewritable optical disk depending on the application. Further, it is possible to realize a recording apparatus for an optical disk that can be used in a DVD video player, and further to realize a recording apparatus capable of erasing a recorded image on a write-once optical disk. These make it possible to provide a small-sized video signal recording device excellent in usability.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a block configuration of a video signal recording / reproducing device in which a video signal recording device and a video signal reproducing device of the present invention are integrated.

The video signal recording / reproducing apparatus 100 performs a recording operation on the optical disk 102 mounted on the motor 101 and a reproducing operation from the mounted optical disk 102.

The data flow of the recording operation is based on the input data input from the external input device 106 via the input interface unit 105 under the control of the system control unit 104 under the control of the system control unit 104 when the recording start instruction from the operation unit 103 is received. Is stored in a buffer memory 107, and the stored input data is subjected to data processing by a data encoding unit 108, and then a laser pickup (PU) via a digital signal processing unit 109 and a high-frequency amplifier (RF amplifier) 110. By 111, recording is performed on the optical disk 102 mounted on the motor 101.

The data flow of the reproducing operation is as follows. The data of the optical disk 102 mounted on the motor 101 is read by a laser pickup (PU) 111 and transmitted through a high-frequency amplifier (RF amplifier) 110 and a digital signal processing unit 109. The data is output as digital data from the data decoding unit 112 and is output to the external output device 115 via the display unit 113 or the output interface unit 114 under the control of the system control unit 104.

The servo signal processing unit 116 generates a servo signal based on a signal from the high frequency amplifier 110 and controls the motor 101 under the control of the drive mechanism control unit 117. The drive mechanism control unit 117 controls the servo signal processing unit 116 and the digital signal processing unit 109, and performs drive control in the optical disc recording / reproducing device 100.

The display unit 113 displays the reproduction data in the present embodiment, but can be used to monitor data from the external input device 106.

As the external input device 106, a tuner for receiving a broadcast, a digital camera, or the like is assumed. If an image input camera is used as the external input device 106 and the camera and the recording / reproducing device 100 are integrally configured, a camera recorder (camcorder) using an optical disk can be constructed.

映像 As the external output device 115, a video output device such as a monitor television or a video printer is assumed. In the case of simple image reproduction, the image can be confirmed on the display of the display unit 113, though it is a small screen by the LCD.

FIG. 2 is a system configuration diagram showing another embodiment of the recording / reproducing apparatus of the present invention.

FIG. 2 shows the embodiment of FIG. 1 with a disc identification unit 200 added.

There are three types of optical disks: a read-only type such as a CD-ROM and a DVD-ROM, a rewritable type such as a CD-RW and a DVD-RAM, and a write-once type such as a CD-R and a DVD-R. Since it is a recording device, the types of optical disks that can be recorded are limited to two types of optical disks: rewritable and write-once. The disk identification unit 200 determines the type.

In this embodiment, the optical disc is identified by the structure of the cartridge.

FIG. 3 shows an embodiment of the cartridge.

The optical disk 301 is stored in the cartridge 300, and since the shutter 302 of the cartridge 300 alone is closed, the optical disk 301 does not directly touch the hand, so that the optical disk 301 is protected. . However, when the optical disk 301 is mounted on the recording / reproducing apparatus, the shutter 302 is opened and the optical disk 301 is directly irradiated with the laser.

Opening 303 is an opening used for write protection for preventing erroneous writing. If it is open, recording is possible, but if it is not open, recording is prohibited.

The opening 304 is an opening for identifying an optical disk. When it is open, it means a rewritable optical disk, and when it is not open, it is a write-once optical disk.

(4) The disc identification unit 200 identifies whether the opening 304 is open or non-open, and identifies a rewritable optical disc and a write-once optical disc.

In the present embodiment, the result of disc identification is displayed on the display unit 113.

In the case of a rewritable optical disk, data can be re-recorded (overwritten) in the same location, and the contents of a directory storing data files and file management information and the arrangement thereof can be changed. Since rewriting cannot be performed at the same location, processing unique to the write-once type is required. In the present embodiment, the processing method is changed to a processing method suitable for the disk based on the disk identification result.

Normally, the write-once type employs a multi-session structure.

Figure 4 shows the structure of a multi-session.

The multi-session structure 400 has a structure in which there are a plurality of sessions each including a lead-in area and a lead-out area.

The area from the lead-in area 411 to the lead-out area 413 is the first session (1st session) 401, the area from the lead-in area 414 to the lead-out area 416 is the next session (2nd session) 402, and the area from the lead-in area 417 to the next session. Starts, and the final session is completed up to the lead-out area 418.

The first session 401 includes a lead-in area 411, a data recording area 412, and a lead-out area 413. In the lead-in area 411, a data recording area start address of the next session 402 is recorded.

(5) A method for searching for the last session will be described with reference to the flowchart in FIG.

Starting at step 500, the pickup is moved to the lead-in area 411 of the first session in step 501. The start address of the data recording area 415 of the next session 414 recorded in the lead-in area 411 of the first session is read out (step 502), and seek is performed to that address to determine whether the data recording area has been recorded. A determination is made (step 503), and the process proceeds to step 505.
If it is determined in step 505 that the data recording area has not been recorded, the process proceeds to step 505.
In step 506, it is determined that the first lead-in area 411 is the last session, and the process ends (step 506).

If the data recording area has been recorded in step 504, the process proceeds to step 502, and the start address of the data recording area of the next session 417 recorded in the lead-in area 414 of that session 402 is read ( Step 502) seeks to the address to determine whether or not the data recording area has been recorded (step 503), and proceeds to step 505. In this operation, steps 502 to 504 are repeatedly executed until it is confirmed that the data recording area has not been recorded. When it is confirmed that the data recording area has not been recorded, it is known that the previous session is the last session.

探索 Search for the last session in such a flow.

If the directory information of the previous session is collected and stored in the directory of the last session (the area where the file management information is stored), the file information of the entire optical disc can be obtained simply by managing the directory of the last session. Will be able to manage it. At this time, if the file information to be deleted is not recorded in the directory of the last session, the file is logically deleted.

In the case of a rewritable optical disk, the file can be erased by erasing or rewriting the information of the data file from the data file and the directory that manages the data file. Can not. Therefore, files cannot be deleted in principle. In the present embodiment, file deletion is logically realized by not recording information of a data file to be deleted from the directory of the last session. Of course, it is also possible to physically erase data by making use of the fact that data cannot be read out by intentionally re-recording data in the area of the same address.

A session may be configured each time a file is recorded. However, the lead-in area and the lead-out area forming the session are recorded each time, and the use efficiency of the data area is reduced.

In the present embodiment, a session is configured when the optical disk is ejected or when the user instructs. Further, this session configuration may be executed by an external personal computer.

FIG. 6 conceptually shows the data structure of a write-once optical disc recorded in a multi-session format according to the present invention. In FIG. 6, a session 601 includes a Lead-in area 611 and a Lead-out area 613, and a data area 612 for recording logical volume information and files and data for managing files. Are continuously recorded.

As shown in the logical volume 602, the data area 612 includes a Volume Recognition data area 621 indicating that the data is recorded in a logical format conforming to UDF and ISO9660, and a UDF Volume Descriptor Sequence area 622 indicating the identity of the logical volume. And an anchor volume descriptor pointer 623 indicating a range of the volume descriptor sequence area 622, a linking area 624, and a file data area 625 for recording files and information for managing the files. The linking area 624 is an area peculiar to the write-once optical disc. In order to avoid the write-once optical disc, the linking area 624 affects the area immediately before the recording start area and makes the information of the area immediately before the recording start area undefined. In the case of recording after the end of the already recorded portion, additional recording is performed from the linking area 624 minutes after the already recorded portion. The volume and file structure of ISO9660 and UDF conform to the ISO9660: 1988 standard and OSTA (Optical Storage Technology Association) UDF (Universal Disk Format) Specification Revision 1.50, respectively.

Hereinafter, the format of ISO9660, which is a management structure of a file recorded in the logical volume 602, and the UDF format will be described.

FIG. 7 conceptually shows files to be recorded in conformity with the logical format of ISO9660 and information for managing the files. In FIG. 7, reference numeral 704 denotes File data for recording data of a file, and reference numeral 703 denotes a Directory Record for recording a recording position and a recording range of the File Data 704, attribute information for uniquely specifying a file, and the like. Further, the Directory Record 703 records the recording position and recording range of the Directory Record group, attribute information for uniquely specifying the Directory Record group, and the like, and can also hold it hierarchically. Reference numeral 702 denotes a Path Table Record that records the recording positions of all Directory Records 703, the recording range, and the like. Reference numeral 701 denotes a Primary Volume Descriptor for recording a path table 702, a recording position of a Directory Record group in the highest hierarchy, a recording range, and the like.

(4) The Primary Volume Descriptor 701 is recorded in the Volume Recognition data area 621, and the other 702 to 704 are recorded in the file data area 625.

FIG. 8 conceptually shows files to be recorded in conformity with the UDF logical format and information for managing the files. In FIG. 8, reference numeral 806 denotes File data for recording data of a file, which corresponds to File Data 704 in FIG. Reference numeral 805 denotes a File Entry for recording a recording position and a recording range of the File Data 806, attribute information for uniquely specifying a file, and the like 804 represents a recording position and a recording range of the File Entry 805. Is a File Identifier Descriptor that records The File Entry 805 records the recording position and the recording range of the File Identifier Descriptor group, attribute information for uniquely specifying the File Identifier Descriptor group, and the like, and can also hold the information hierarchically. Reference numeral 802 denotes a File Set Descriptor that records the recording position of the highest level File Entry 805, and 801 denotes a Logical Volume Descriptor that records the recording position, recording range, and the like.

The Logical Volume Descriptor 801 is recorded in the UDF Volume Descriptor Sequence area 622, and the other 802 to 806 are recorded in the file data area 625.

The present invention has a configuration in which the number of times of recording the lead-in area 611 and the lead-out area 613 is reduced so as not to reduce the area in which the video signal can be recorded. Usually, the Lead-out area 613 is an area for recording information for specifying the additional recording position again when the write-once optical disc device stops holding the additional recording position of the video signal. On the other hand, the video signal to be recorded is recorded as File Data 704 (File Data 806), and before recording the Lead-out area, the file shown in FIGS. 7 and 8 can be read according to the logical structure of ISO9660 or UDF. It is necessary to generate and record management information. Therefore, even after the write-once optical disc device stops holding the write-on position of the video signal, the write-once position can be specified, and the information capable of generating the file management information shown in FIGS. If the information is recorded on the optical disc, the number of times of recording the lead-in area 611 and the lead-out area 613 can be reduced.

FIG. 9 shows an embodiment of the above intermediate information. As the intermediate information, an intermediate information data record 901 is additionally recorded in the Lead-in area 601 of the session 601 to be additionally recorded, one record for each File Data 704 of the video signal to be additionally recorded. The intermediate information data record 901 includes at least a recording position 911 of the File Data 704, a recording size 912, and a recording date and time 913, as information on the File Data 704 necessary to generate the file management structure in FIGS. The flag 914 indicating the presence or absence of the next intermediate information data record is recorded. According to the intermediate information data structure, it is obvious that the additional recording position can be specified from the recording position 911 and the recording size 912 of File Data 704 of the last record of the intermediate information data record 901. Even after the type optical disk device stops holding the additional recording position of the video signal, the additional recording position can be specified. In the present embodiment, the intermediate information is added to the Lead-in area 601 of the additional recording target session 601. However, by adding information that can specify which session the intermediate information is, the Lead-out, Alternatively, it may be recorded outside the volume shown in FIG.

Next, a flowchart of a process of generating and recording the file management information in FIGS. 7 and 8 before recording the Lead-out area will be described with reference to FIG.

First, all the intermediate information data records 901 are read from the Lead-in area 611 recorded after the last session (1001). Next, from the intermediate information data record 901 read in 1001, a Path Table Record 702 and a Directory Record 703 that match the ISO9660 standard are generated (1002), and a File Entry 905, File Identifier 904, and File Set Descriptor 902 that match the UDF specification are created. Generate (1003). Then, from the intermediate information data record 901 read in 1001, the end position of additional writing is obtained, and the data generated in 1002 and 1003 is added from the end position (1004). Next, generation of Volume Recognition data conforming to ISO9660 and UDF specifications (1005), generation of UDF Volume Descriptor Sequence conforming to UDF specifications (1006), and Anchor Volume Descriptor Pointer 623 indicating the range of the Volume Descriptor Sequence area 622 Is generated (1007) and recorded in each area described in FIG. 6 (1008).

According to the processing described with reference to FIG. 10, the information for managing the file of each session 601 is recorded only for the file recorded in each session. If the file including the information to be recorded is recorded as the information for managing the file, all the File Data 704 of all the sessions can be read out based on the information for managing the file of the last session. A flowchart of the processing will be described with reference to FIG.

First, all the intermediate information data records 901 are read from the Lead-in area 211 recorded after the last session (1101). Next, the Path Table Record 702 and Directory Record 703 are read from the last session (1102). From the intermediate information data records 901 and 1102 read in 1101, the Path Table Record 702 and Directory Record 703 that match the ISO9660 standard are read. It is generated (1103). Further, the file entry 805, the file identifier 804, and the file set descriptor 802 are read from the last session (1104). A Descriptor 802 is generated (1105). Then, an additional recording end position is obtained from the intermediate information data record 901 read in 1101, and the data generated in 1103 and 1105 is added from the end position (1106). Next, the Volume Recognition data and the UDF Volume Descriptor Sequence are read from the last session (1107), the Volume Recognition data 621 conforming to the ISO9660 and UDF specifications are generated (1108), and the UDF Volume Descriptor Sequence 622 conforming to the UDF specifications Is generated (1109), and an Anchor Volume Descriptor Pointer 623 indicating the range of the Volume Descriptor Sequence area 622 is generated (1110), and recorded in each area described in FIG. 6 (1111).

In the above embodiment, the information for managing the file of the previous session is read, but the intermediate information data record for all sessions may be read to generate the information for managing the file. In this case, for example, a means for allowing the user to designate erasure and adding flag information indicating that the record information is invalid as data of the intermediate information data record is provided, and information for managing a file from only non-invalid intermediate information data records is provided. If it is generated, it is possible to make the specified file unreadable. For safety, a means for destroying data by overwriting meaningless data on designated data is also provided, and it is possible to completely erase the data.

中間 In the embodiment of FIG. 9, the intermediate information is recorded in the recording area of the optical disc, but another embodiment for recording the intermediate information is shown in FIG.

FIG. 12 shows a configuration in which an EEPROM 1200 is added to the embodiment of FIG. The EEPROM 1200 can be rewritten by a normal write operation, and has a property of retaining written data even when the power supply voltage becomes 0V. Therefore, by writing the intermediate information in the EEPROM 1200, a session can be configured at any time.

The intermediate information recorded in the EEPROM 1200 is used when a session is formed using the intermediate information or after performing finalization (work for finally recording a readout area and completing an optical disc). Can be erased.

中間 In order to support a plurality of optical discs, it is necessary to record a plurality of intermediate information.

The time stamp for recording the intermediate information is stored in the EEPROM 1200, and when another optical disk whose session is not completed is mounted, the time stamp last recorded on the optical disk and the time stamp stored in the EEPROM 1200 are stored. By searching for intermediate information that matches the time stamp of the intermediate information and using the intermediate information that matches the time stamp, additional writing can be continuously performed on the mounted optical disc.

(4) In the case of an optical disk recorded by another video signal recording device, if the session is not completed, there is no intermediate information for the optical disk in the EEPROM 1200, so that it is impossible to match the data when recording on the optical disk. Therefore, the number (for example, manufacturing number) of the video signal recording device used at the time of recording is recorded on the optical disc, and the number of the video signal recording device to be recorded and the number of the video signal recording device recorded on the optical disc are recorded. Is confirmed, the intermediate information and the optical disk can be matched.

Of course, the above two selection methods can be used in combination.

Since the write-once optical disc has a session structure, a lead-in area and a lead-out area exist for each session, and there is a problem that a user cannot accurately know the remaining recording capacity (recordable time). In a rewritable optical disc, when adding a session, the contents of the lead-in area of the recorded session are rewritten, the lead-out area of the recorded session is recorded as a data recording area, and finally, the lead-out area is recorded. , A single session comprising one session, the remaining recording capacity (recordable time) can be accurately known.

The optical disk recorded by the recording device of the present invention can be reproduced by a DVD-Video player. For that purpose, it is necessary to match the file management method assumed by the DVD-Video player. In the present invention, the ISO9660 standard and the UDF standard are adopted, and the compatibility with the file management method of the DVD-Video player is achieved.

It is a block diagram of a video signal recording device and a video signal reproduction device of the present invention. FIG. 3 is a block diagram of a video signal recording device and a video signal reproduction device having a disc identification unit. FIG. 3 is an explanatory diagram for describing one embodiment of a cartridge. FIG. 3 is an explanatory diagram for explaining a multi-session structure. It is a flowchart which shows the method of searching for the last session. FIG. 3 is an explanatory diagram for describing a data structure of a write-once optical disc recorded in a multi-session format according to the present invention. FIG. 9 is an explanatory diagram for describing files to be recorded in conformity with the logical format of ISO9660 and information for managing the files. FIG. 9 is an explanatory diagram for describing files to be recorded in conformity with the logical format of the UDF and information for managing the files. FIG. 4 is an explanatory diagram for explaining an intermediate information data structure of the present invention. 9 is a flowchart of a process for generating and recording the file management information in FIGS. 7 and 8. 9 is a flowchart of a process for generating and recording the file management information in FIGS. 7 and 8. FIG. 2 is a block diagram of a video signal recording device and a video signal reproducing device having an EEPROM for storing intermediate information.

Explanation of reference numerals

100 Video signal recording / reproducing device 102, 301 Optical disk 103 Operation unit 108 Data encoding unit 112 Data decoding unit 113 Display unit 200 Disk identification unit 300 Cartridge 303, 304 Opening 411, 414, 417 Lead-in area 401 First session 402 Second session 412 , 415 Data recording area 413, 416, 418 Lead-out area 623 Anchor Volume Descriptor
624 linking area 901 intermediate information data record 1200 EEPROM.

Claims (5)

A write-once information recording medium, means for identifying and detecting a rewritable information recording medium, control means for each of a write-once information recording medium and a rewritable information recording medium, and a display means for the detection result; A video signal recording device using an information recording medium, comprising: 映像 A video signal recording apparatus using an information recording medium, wherein file management information for creating a directory is recorded as intermediate information on the information recording medium in the video signal recording apparatus using the information recording medium. A video signal recording device using the information recording medium according to claim 2, wherein the intermediate information is recorded by the video recording device. In a video signal recording device using an information recording medium, file management information for creating a directory, from a file management information recorded as intermediate information, a directory is created, and recorded on the information recording medium, A video signal recording apparatus using the information recording medium according to claim 2. 5. The video signal recording device using the information recording medium according to claim 4, wherein the intermediate information and the directory are recorded by the video recording device.

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