JP4026014B2 - Optical disk device - Google Patents

Description

  The present invention relates to an optical disc apparatus that efficiently searches a directory stored in a recording medium and selects a file.

  Recently, recording media such as CDs and DVDs, which are recording media, are recorded with a file structure conforming to the ISO 9660 standard, which is a logical format standard for CD-ROMs and also adopted for DVD-ROMs. In this case, according to the ISO9660 standard, a path table storing all information related to the hierarchical structure of all directories in the recording medium is written on the recording medium. Therefore, the optical disk apparatus uses the path table when reproducing the recording medium. To search the directory.

  In this case, the directory search is performed using the directory name written in the path table. The file selection is also performed using the file name.

By the way, a method for shortening the time required for such a file search has been proposed (see, for example, Patent Document 1). The document processing apparatus described in Patent Document 1 extracts the medium identification information and the file identification information from the recording medium and records them in the identification information correspondence table, thereby recording a necessary document file. The media can be searched quickly.
Japanese Patent Registration No. 2735731

  As described above, the ISO9660 standard includes a path table for use in searching a directory. However, the directory search uses a directory name written in the path table. There was a problem that processing time was required. Further, since the file name is used for the file selection, there is a problem that the longer the number of characters, the longer the processing time is required.

  Moreover, the thing of the said patent document 1 can select medium identification information by seeing the content of the identification information currently displayed by the user by matching and displaying the medium identification information and file identification information which are character information. This is not intended to speed up the search process of the device itself.

  The present invention was devised to solve such problems. The purpose of the present invention is to search a directory of a recording medium recorded in a file structure conforming to the ISO 9660 standard and to select a file. An object of the present invention is to provide an optical disc apparatus which can be efficiently performed without using a path table.

In order to solve the above-described problems, the optical disc apparatus of the present invention records a directory search and file selection of a recording medium recorded in a file structure conforming to the ISO 9660 standard in the recording medium according to the standard. An optical disc apparatus that performs without using a path table, and at the time of reading a recording medium, assigns unique numbers to all recorded directories and files, thereby creating a table for searching by the numbers And a storage means for storing the created search table, and a control means for searching for a directory or a file using the search table when the recording medium is reproduced.

  In this case, the management of the directory has a hierarchical structure, and the numbers assigned to the directories are assigned with sequential numbers starting from 1 in the order of description from the shallowest level, and the numbers assigned to the files are the directory numbers. They are assigned in the order of description of directory records from the youngest.

In the search table, the head address of each directory is stored in association with the number assigned to each directory, and the number of directories in each directory and the offset value of the number of files are assigned to each directory. It is stored in association with the number. The offset value for the number of directories is a value indicating how many directories are in the hierarchy one level lower than the directory with the corresponding number, and the offset value for the number of files is the value immediately before the directory with the corresponding number. It is a value indicating how many files are included in the directory numbered.

  By creating such a search table, when searching for directories and files, it is possible to search using the associated number as a key, compared to searching using the directory name or file name as a key. And the search time is substantially constant.

  In this case, the control means records the search table stored in the storage means in a predetermined area of the recording medium, and for subsequent loading, the search table recorded in the predetermined area of the recording medium. The table may be read and stored in the storage means. Thus, by recording the created search table on the recording medium, it is not necessary to create the search table again at the next loading.

On the other hand, when reproducing the recording medium, wherein, when the user selects an arbitrary file, the search table file number assigned to As a file without using the path table in the key with reference to the offset value to search a file of that number, reads the start address of the directory number that contains As a file, the optical pickup is moved to the start address position to start playback.

  According to the optical disk apparatus of the present invention, sequential numbers starting from 1 are assigned to all recorded directories in the order of description from the shallowest level, and numbers are assigned to all files in the order of description of directory records from the lowest directory number. Since a search table is created and search is performed using the created search table, when searching for a directory or file, it is possible to search using the associated number as a key. Compared to the conventional case of searching using a file name as a key, the search processing speed can be increased and the search time can also be set to a substantially constant time.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a system configuration of an optical disc apparatus according to an embodiment of the present invention.

  The output of the optical pickup 3 that writes data to the loaded optical disc 1 and reads data from the optical disc 1 is connected to the digital signal processing circuit 7 via the RF amplifier 5, and the output of the digital signal processing circuit 7 is optical It is connected to a laser driver 8 that controls the laser output when data is written or read by the pickup 3. The output of the servo processing circuit 9 is connected to a feed motor 4 for moving the optical pickup 3 in the radial direction of the optical disk 1 and a spindle motor 2 for rotationally driving the optical disk 1. These digital signal processing circuit 7 The servo processing circuit 9 is bidirectionally connected to a system controller 10 that controls the operation of the entire apparatus.

  The digital signal processing circuit 7 is connected to a DRAM 6 as a buffer for temporarily storing data during a recording operation and a reproducing operation. The digital signal processing circuit 7 converts the digital data into analog data and displays a display device such as a CRT. A D / A conversion circuit 12 for output to the terminal 21 is connected. The digital signal processing circuit 7 is connected to an A / D conversion circuit 16 that converts an analog signal input from the input terminal 16a into a digital signal.

  The system controller 10 is bi-directionally connected to an EEPROM 11 for storing unique information such as parameters of the optical disc 1 and laser power parameters, and is also a display made up of an LCD, FLD, etc. provided on the front of the apparatus main body. A panel 13 is connected. The system controller 10 is connected to a storage unit 17 including, for example, a non-volatile memory for storing a search table to be described later, a receiving unit 14 for receiving an infrared signal from the remote controller 31, and the like. The search table may be stored in a work RAM (not shown) in addition to the storage unit 17.

  The digital signal processing circuit 7 divides a 16-bit signal into 8 bits and converts the 8 bits into 14 bits in accordance with EFM demodulation or an error correction method using ACIRC (Advanced Cross Interleaved Reed-Solomon Code). I do. The digital signal processing circuit 7 performs processing such as data compression for writing digital data such as video information input from the external input terminal 16 to the optical disc 1.

  When reading the loaded optical disk 1, the system controller 10 assigns unique numbers to all recorded directories and files, thereby creating a search table with the numbers and storing it in the storage unit 17. Further, when the user selects an arbitrary directory or file during playback of the recording medium, the system controller 10 refers to the search table using the number assigned to the directory or file as a key, The file is searched, the head address associated with the directory or file is read, the optical pickup is moved to the head address position, and reproduction is started.

  In other words, in this embodiment, a unique path table (a unique path table different from the path table prepared in the ISO 9660 standard) that allows the system controller 10 to search all directories and all files using numbers as keys. Created as a search table.

  The search table created in this way may be recorded in a predetermined area (for example, a user data area) of the loaded optical disk 1. At the subsequent loading, the search table recorded on the optical disc 1 may be read and stored in the storage unit 17. Thereby, it is possible to save the trouble of creating the search table each time the optical disk 1 is loaded.

  Next, a search table created by the system controller 10 and stored in the storage unit 17 in the DVD apparatus having the above configuration will be described in detail.

  FIG. 2 shows an example of the data structure of the directory recorded on the optical disc 1.

  The directory has a hierarchical structure as shown. The numbers assigned to these directories are assigned serial numbers starting from 1 in the order of description from the shallowest level. The numbers in parentheses in the figure indicate the numbers assigned to the directory.

  Specifically, the root directory is No. 0, the first directory in the next hierarchy (first layer) is No. 1, the directory below it is No. 2, and the directory below is further assigned No. 3 in order. It has been. Then, it moves to the next layer (second layer), the number 4 is the continuation number of the highest directory in the second layer, the number 5 is assigned to the directory below it, and the number 6 is further assigned to the directory below it. ing. Then, the process moves to the next layer (third layer), and the number 7 is assigned to the highest directory in the third layer.

  In FIG. 2, for simplicity of explanation, the number of directories is seven and the hierarchical structure is up to three layers. However, in reality, there are more directories and four layers in each layer. In many cases, directories are associated with five layers, and so on.

  Although not shown, a plurality of files are stored in each directory. In the present embodiment, it is assumed that the number of files shown in FIG. 3 is stored in each directory. That is, 10 files are stored in the 0th root directory, 9 files are stored in the 1st directory, and 8 files are stored in the 2nd directory. , ..., it is assumed that three files are stored in the seventh directory. In this embodiment, sequential numbers starting from 1 are also assigned to these files.

  That is, the directory numbers are assigned in the order of description of the directory records from the smallest number. Specifically, for example, the file number described first in the first directory is because ten files are stored in the root directory (that is, the first to tenth files are already assigned). ), No. 11. In addition, as for the file number described first in the second file, ten files are stored in the root directory (that is, 1 to 10 are already assigned), and the first directory No. 9 is stored (that is, No. 11 to No. 19 have already been assigned), so No. 20 is stored.

  FIG. 4 shows an example of the data structure of a search table created when the optical disk 1 is read by the system controller 10 under such conditions.

  The search table of the present embodiment includes the directory number (Directory Number) assigned as described above, the head address (Directory Extent), the file offset value (File Offset), and the directory offset value (Directory It consists of each item of (Offset).

  Here, the directory offset value indicates how many directories exist up to that level, assuming that the directory is one level below when the level below the corresponding directory number is viewed. Yes.

  More specifically, the directory offset value corresponding to the directory number 1 is 3. This is because when the highest directory (here, directory number 4) in the hierarchy (second layer) immediately below directory number 1 is viewed, the number of directories before the number 4 is assigned to the directory. It shows whether there was. That is, in this case, since the directory number 1, directory number 2, and directory number 3 already exist, the directory offset value corresponding to the directory number 1 is 3.

  Similarly, the directory offset value corresponding to the directory number 2 is 5. This is because when the highest directory (here, directory number 6) in the hierarchy (second layer) immediately below directory number 2 is viewed, the number of directories before the number 6 is assigned to the directory. It shows whether there was. That is, in this case, there are already five directories, ie, directory number 1, directory number 2, and directory number 3 in the first layer, and directory number 4 and directory number 5 in the second layer. Therefore, the directory offset value corresponding to the directory number 2 is 5.

  Similarly, the directory offset value corresponding to the directory number 3 is 6. This is because, when looking at the highest directory (not existing in this example) of the hierarchy (second layer) immediately below directory number 3, it is assumed that a number is given to the nonexistent directory, It shows how many directories there were. That is, in this case, the directory number 1, directory number 2, and directory number 3 are already in the first layer, and directory number 4, directory number 5, and directory number 6 are in the second layer. Since the directory exists, the directory offset value corresponding to the directory number 3 is 6.

  Similarly, the directory offset value corresponding to the directory number 4 is 6. This is because when the highest-level directory (here, directory number 7) in the hierarchy (third layer) immediately below directory number 4 is viewed, how many items are added before the number 7 is assigned to that directory. Indicates whether there was a directory. That is, in this case, the directory number 1, directory number 2, and directory number 3 are already in the first layer, and directory number 4, directory number 5, and directory number 6 are in the second layer. The directory exists, but the directory offset value corresponding to the directory number 3 is also the directory offset value corresponding to the directory number 3 because the directory does not exist in the layer (second layer) immediately below the directory of the number 3. It is 6 like.

  Similarly, the directory offset value corresponding to the directory number 5 is 7. This is because, when looking at the highest directory (not existing in this example) of the hierarchy (level 3) one level below the directory number 5, it is assumed that a number is given to the non-existent directory. It shows how many directories there were. That is, in this case, the directory number 1, the directory number 2, and the directory number 3 are already in the first layer, the directory number 4, the directory number 5, and the directory number 6 are in the second layer. Since there are a total of seven directories with one directory number 7, the directory offset value corresponding to the directory number 5 is 7.

  Similarly, the directory offset value corresponding to the directory number 6 is also 7. This is because, when looking at the top directory (not existing in this example) of the hierarchy (level 3) one level below the directory number 6, it is assumed that a number is given to the nonexistent directory. It shows how many directories there were. That is, in this case, the directory number 1, the directory number 2, and the directory number 3 are already in the first layer, the directory number 4, the directory number 5, and the directory number 6 are in the second layer. Since there are a total of seven directories with one directory number 7, the directory offset value corresponding to the directory number 6 is also 7.

  Similarly, the directory offset value corresponding to the directory number 7 is also 7. This is because, when looking at the highest directory (not present in this example) of the hierarchy (fourth layer) immediately below directory number 7, it is assumed that a number is assigned to the non-existent directory. It shows how many directories there were. That is, in this case, the directory number 1, the directory number 2, and the directory number 3 are already in the first layer, the directory number 4, the directory number 5, and the directory number 6 are in the second layer. Since there are a total of seven directories with one directory number 7, the directory offset value corresponding to the directory number 7 is also 7.

  In summary, the directory offset value has the following meaning. In other words, when there is a lower directory connected to the directory at a level below an arbitrary directory number, the number assigned to the lower directory by adding 1 to the directory offset value corresponding to the arbitrary directory number It becomes.

  On the other hand, the file offset value indicates how many files are contained in the directory numbered immediately before the corresponding numbered directory.

  More specifically, the file offset value corresponding to the directory number 1 is 10. This is because the number of files stored in the root directory immediately before directory number 1 is 10 from FIG. 3, and the file offset value corresponding to directory number 1 is 10.

  Similarly, the file offset value corresponding to the directory number 2 is 19. This is because 19 files (= 10 + 9) are stored in FIG. 3 from the total number of files stored up to the directory number 1 immediately preceding the directory number 2 (that is, both the root directory number 0 and the directory number 2 directory). ), The file offset value corresponding to the directory number 2 is 19. As for the file offset value of each directory number, the number obtained by sequentially adding the number of files shown in FIG. 3 is written in the search table as the directory offset value in the same manner.

  By creating a search table (original path table) configured as described above and using this search table when playing a disc, which file is stored in which directory when searching for a directory and when selecting a file This makes it easy to search whether the data is being processed (that is, it is easy because the amount of data to be compared is small), and as a result, the search processing speed can be made fast and constant.

  Specifically, for example, when the user selects an artist name displayed on the display device 21, a file number assigned uniquely is assigned to the artist name. If the file number is 36, for example, the system controller 10 searches the search table using the file number 36 as a key. That is, as a result of referring to the file offset value in the search table, the system controller 10 finds that the file offset value of the directory number 4 is 34 and the file offset value of the directory number 5 is 40. Is determined to be included in the directory number 4, and the head address of the directory of the directory number 4 is acquired. After that, the optical pickup 3 is moved to the acquired head address, and further moved to the head address of the second file in the directory to start reproduction.

  On the other hand, when the conventional path table is used, the path table is searched using the artist name selected by the user as a key. If a large number of files are recorded with the same artist name, I will go to find all the artist names.

  According to the optical disk apparatus of the present embodiment, by using a search table that is uniquely created when reading a disk, for example, in the case of random playback in which playback is performed using only randomly generated numbers, The corresponding file can be searched directly.

1 is a system configuration diagram of an optical disc apparatus of the present invention. It is explanatory drawing which shows an example of the data structure currently recorded on the disc. It is explanatory drawing which shows an example of the number of the files currently stored in each directory. It is explanatory drawing which shows the data structural example of the table for a search concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Spindle motor 3 Optical pick-up 4 Feed motor 5 RF amplifier 6 DRAM
7 Digital signal processing circuit 8 Laser driver 9 Servo processing circuit 10 System controller 11 EEPROM
12 D / A conversion circuit 13 Display panel 14 Receiving unit 16 A / D conversion circuit 17 Storage unit 21 Display device 31 Remote control

Claims (4)

An optical disc apparatus that searches a directory of a recording medium recorded in a file structure conforming to the ISO 9660 standard and selects a file without using a path table written in the recording medium according to the standard,
A table creation means for creating a search table by the numbers by assigning unique numbers to all the recorded directories and files at the time of reading the recording medium;
Storage means for storing the created search table;
Control means for searching for a directory or file using the search table during playback of the recording medium,
Management of the directory has a hierarchical structure, and numbers assigned to the directory are assigned by sequential numbers starting from 1 in the order of description from the shallowest level, and the numbers assigned to the files are younger than the directory numbers. The directory table is assigned in order from the description of the directory records, and the search table stores the start address of each directory in association with the number assigned to each directory, and the number of directories in each directory. And the offset value of the number of files is stored in association with the number assigned to each directory, and the offset value of the number of directories is the number of directories up to one level below the directory with the corresponding number. Is a value indicating Offset value of the number is a value that indicates whether the contains the number corresponding to any number of files in to the directory of the previous number of directory,
The control means records the search table stored in the storage means in a predetermined area of the recording medium, and reads the search table recorded in the predetermined area of the recording medium during subsequent loading. And when the user selects an arbitrary file during playback of the recording medium, the file offset of the search table is set using the number assigned to the file as a key without using the path table. An optical disc characterized by referring to a value and searching for a file having a corresponding number, reading a head address of a directory number containing the file, moving an optical pickup to the head address position, and starting reproduction. apparatus. An optical disc apparatus that searches a directory of a recording medium recorded in a file structure conforming to the ISO 9660 standard and selects a file without using a path table written in the recording medium according to the standard,
A table creation means for creating a search table by the numbers by assigning unique numbers to all the recorded directories and files at the time of reading the recording medium;
Storage means for storing the created search table;
Control means for searching for a directory or file using the search table during playback of the recording medium,
Management of the directory has a hierarchical structure, and numbers assigned to the directory are assigned by sequential numbers starting from 1 in the order of description from the shallowest level, and the numbers assigned to the files are younger than the directory numbers. The directory table is assigned in order from the description of the directory records, and the search table stores the start address of each directory in association with the number assigned to each directory, and the number of directories in each directory. And the offset value of the number of files is stored in association with the number assigned to each directory, and the offset value of the number of directories is the number of directories up to one level below the directory with the corresponding number. Is a value indicating Offset numbers, the optical disk characterized by values der Rukoto that indicate that contains the corresponding number how many files to the directory of the previous number of the directory of the device. The control means records the search table stored in the storage means in a predetermined area of the recording medium, and reads the search table recorded in the predetermined area of the recording medium during subsequent loading. The optical disk apparatus according to claim 2, wherein the optical disk device is stored in the storage unit. When reproducing the recording medium, when the user selects an arbitrary file, the control means refers to the file offset value of the search table using the number assigned to the file as a key without using the path table. 3. A file having a corresponding number is searched, a head address of a directory number including the file is read, and reproduction is started by moving the optical pickup to the head address position. Optical disk device.