JPH117753A - Optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent reproduction of images from being stereotyped by enabling predetermined video objects to be read out in an optional order on the basis of positional information of the video objects in accordance with reproduction control information indicating a reproduction order of the video objects stored in a volume area. SOLUTION: On the basis of information of a volume management area read out by an optical pickup, a system control 93 reads out a video manager, calculates and reproduces a recording address of a volume menu PGC with reference to a menu program chain PGC management information table, and determines a video object VOB to be reproduced with reference to the address. A mechanism control 83 and a signal processor 84 reproduce the determined VOB from an optical disk and display a volume menu at a monitor. When an operator selects a required menu item from a list table, the system control 93 executes a command on the basis of a corresponding branch command and a title number.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk on which an information signal is recorded using a light beam, and more particularly to an optical disk on which an object including digital moving image data, audio data, and sub-picture data is recorded.

[0002]

2. Description of the Related Art As music software and video software flood,
Interactive software of various genres, such as aerobics, learning teaching materials, cooking teaching materials, etc., have been spotlighted as next-generation video software. Interactive software refers to software that has a plurality of branches in the progress of playback and switches the branch destination as appropriate according to the operation of the operator. Simple software has emerged as an application for current video CDs. I have. The first basic technology of interactive software is distributed recording.

That is, an image of about one hour in length is not recorded sequentially on a spiral track, but is cut into several seconds or several minutes, and these are cut on a plurality of arcs of the spiral track. Record in random order. The second basic technology is random access in which several pieces of video information are read in an arbitrary order by a plurality of pieces of control information. The control information for random access is configured by pairing the read order of the shredded video and the address information indicating the arc of the spiral track on which the video is recorded. There are a number of control information in which the combination of the reading order is changed, and the user can select one of them from a menu or the like.

[0004] By switching the reproduction progress through the menu, the interactive software described above presents a number of courses, and allows the operator to select a course that is desired by the operator. Hereinafter, an example of the aerobics interactive software will be briefly described. In aerobics interactive software, live-action videos of instructors performing exercises are recorded on multiple optical disks. In addition, a reproduction path suitable for the exercise purpose of the operator, such as "slimming the waist", "slimming the foot", "5kg diet", is also recorded on the optical disc. These reproduction paths correspond to one course, and specify that only the actual photographed video that is suitable for the purpose is selectively reproduced. For example, in the playback path of the "Slimming feet" course, of the live-action footage of the above instructor, rhythmically stepping, raising the right leg and left leg, jumping, etc. Are sequentially reproduced.

[0005] In the playback path of the "narrow waist" course, among the actual images of the above-mentioned instructor, actual images of movement around the waist, such as twisting the waist clockwise and counterclockwise and tilting the upper body forward, are sequentially displayed. A playback path is specified to play. The titles of these courses are presented to the operator by a menu drawn with image data when the optical disc is loaded into the disc reproducing apparatus. When the operator loads the optical disc into the disc reproducing apparatus and selects one of the courses while considering his / her exercise purpose, physical strength, and agility, the reproducing path corresponding to the course is selected, and the disc reproducing apparatus performs the reproduction. A plurality of real video images are sequentially read from the optical disk according to the path. The video thus read is decoded into a video signal and displayed on a television. If the operator performs the same exercise as the instructor in accordance with the displayed live-action video, the exercise can be easily performed at home. If you feel unsatisfactory with the exercise as a result of trying out the course or feel tired of following the instructor's movement, you can adjust the level by selecting another course.

As described above, interactive software using an optical disk as a medium can switch a course in accordance with its own athletic ability and athletic purpose, so that it is ideal for a housewife to easily carry out a diet during housework.
It is ideal for office workers and office workers to resolve their daily lack of exercise in a short time before going to work.

[0007]

However, the conventional interactive software has a problem in that, although a number of courses are provided for different purposes, the order of the real shot images is the same each time, and the user is tired of it quickly. For example, in the case of aerobics, the order of the lessons is the same each time, so that the body adapts to the order. To put it plainly, the rut is quick.

To overcome the above-mentioned rut, it will be conceived to utilize the random reproduction function of the disk reproducing apparatus. The random reproduction function is a function of reproducing recorded contents at random, not in the order of recording, and is widely used as an automatic music selection function of music software. However, such a solution is not very desirable for interactive software. This is because such a random reproduction function is intended to reproduce the entire recorded contents of the optical disk in random reproduction. If such random playback is performed on an optical disc on which interactive software is recorded, a sub-picture of a menu, a picture of an instructor raising a leg, and a picture of waving an arm are displayed in a mixed order. . When displayed in a mixed manner as described above, the operator cannot understand what is being performed on the screen, and is confused.

[0009] The simple random reproduction of the recorded contents of the optical disk merely unnecessarily collapses the logical structure of each course constituted by the reproduction path of the interactive software. The only way to avoid such confusion and to display the real video image in random reproduction is to call on the operator to use the user programming function in the disk reproducing device. The user programming function is a function for instructing the disc reproducing apparatus which recorded contents are to be displayed in what order. This is used to call on the operator to change the playback order of the live-action video of each course. This interrogation is mainly performed on the paper surface such as the jacket of the optical disk and the instruction manual. The user programming function is a function that is provided as a standard feature in recent disk reproducing apparatuses, and using this function does not cause any problem. However, the problem here is that the operator is encouraged to use this function. That is,
Even so, asking a busy housewife or office worker to program a live-action video playback order each time and having them do aerobics would impair the simplicity unique to optical discs. Could be shunned.

A first object of the present invention is to provide an optical disk capable of randomly selecting and reproducing moving image data relating to a course selected by an operator without causing confusion of what to see. is there. A second object of the present invention is to provide an optical disk capable of randomly selecting and reproducing moving image data relating to a course selected by an operator without using a programming function.

[0011]

In order to achieve the first and second objects, the present invention provides an optical disk having a volume area having a sector structure, wherein the volume area is located at the innermost periphery of the volume area. A volume management area to be arranged, an area for storing a plurality of video objects including moving image data, and an index area for storing playback control information indicating a playback order of a predetermined video object, wherein the volume management area includes: An area having first position information indicating a position of a sector of the index area, wherein the index area is located near a predetermined video object indicated by the reproduction order information, and indicates a position of a sector of the predetermined video object. Running the second position information indicating at least one of the predetermined video objects. Or to play arm, and is configured to be a region having a flag information indicating whether to sequentially reproduce all the given video object,

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical disc in this embodiment is
A digital video disk (hereinafter abbreviated as DVD) in which a recording capacity of about 4.7 Gbytes on one side is realized on an optical disk having a diameter of 120 mm is preferable. In the following description, items are described as follows to facilitate understanding. At that time, a classification number is attached to the left of each item. The number of digits of the classification number means the hierarchical depth of the item. The highest order of the classification numbers is (1) and (2), (1) relates to an optical disk, and (2) relates to a reproducing device (disk reproducing device). (1.) Physical structure of optical disk (1.1) Logical structure of optical disk (1.1.1) Logical structure-video title set (1.1.1.1) Video title set-video title set management information (1.1.2.2) Video title set-VOB (1.1.2) Logical structure-video manager (2.1) Overview of disc playback device (2.2) Components of disc playback device (2.2.1) Components of disc playback device-signal separation unit 86
(2.2.2) Components of Disc Reproducing Apparatus—Internal Configuration of System Control Unit 93 (1.) Physical Structure of Optical Disc FIG. 1A is a diagram showing the appearance of a DVD, and FIG.
Is a sectional view thereof. FIG. 1C is an enlarged view of a circle of FIG. 1B. The DVD 107 is configured by laminating a first transparent substrate 108, an information layer 109, an adhesive layer 110, a second transparent substrate 111, and a printing layer 112 for label printing from the lower side of the drawing.

The first transparent substrate 108 and the second transparent substrate 111 are reinforcing substrates of the same material, but both have a thickness of about 0.6 mm. That is, both bases are roughly 0.5mm to 0.7mm
Is the thickness. The adhesive layer 110 is provided between the information layer 109 and the second transparent substrate 111 and adheres both.

The information layer 109 has a reflective film such as a metal thin film adhered to a surface in contact with the first transparent substrate 108. Concavo-convex pits are formed at a high density on this reflective film by a molding technique. The pit shape is shown in FIG. Each pit in FIG. 1D has a length of 0.4 μm to 2.13 μm, and is arranged in a spiral shape at a radial interval of 0.74 μm to form one spiral track.

By irradiating the pit train with the light beam 113, information is extracted as a change in the reflectance of the light spot 114 as shown in FIG. DVD
The light spot 114 has a large numerical aperture NA of the objective lens and a small wavelength λ of the light beam.

A DVD having such a physical structure can record about 4.7 Gbytes of information on one side. The recording capacity of about 4.7 GB is almost eight times as large as that of a conventional CD. As a result, the quality of moving images can be greatly improved with DVDs, and the playback time of video CDs can be significantly improved.
It can be improved to 2 hours or more compared to minutes.

The basic technology for realizing such a large capacity is to reduce the spot diameter D of the light beam. Since the spot diameter D is given by a calculation formula of spot diameter D = laser wavelength λ / numerical aperture NA of the objective lens, the spot diameter D is narrowed down by further reducing the laser wavelength λ and increasing the numerical aperture NA. be able to. It should be noted that when the numerical aperture NA of the objective lens is increased, coma occurs due to the relative tilt between the disk surface and the optical axis of the light beam, which is called tilt. In order to reduce this, in DVDs, the thickness of the transparent substrate is reduced. Another problem that the mechanical strength is weakened when the transparent substrate is made thinner is raised. However, the DVD is reinforced by bonding another substrate, thereby overcoming the problem of strength.

For reading data from a DVD, a red semiconductor laser having a short wavelength of 650 nm and an NA of an objective lens are used.
An optical system whose (numerical aperture) is increased to about 0.6 mm is used. This, combined with the reduction of the thickness of the transparent substrate to about 0.6 mm, has led to an information capacity of about 4.7 Gbytes that can be recorded on one side of an optical disc having a diameter of 120 mm. With such a large capacity, one movie produced by a movie company can be recorded on one common disc and provided to a large number of different languages. The recording capacity of 4.7 Gbytes realized by these basic technologies has a surplus even when a plurality of moving image data and audio data are recorded.

FIG. 2A schematically shows a spiral track formed from the inner circumference to the outer circumference of the information layer.
Data reading from the spiral track is performed for each unit called a sector. The internal structure of the sector is shown in FIG.
As shown in (1), it comprises a sector header area, a user data area, and an error correction code storage area. The sector address in the sector header area is used to identify each sector. The disc reproducing apparatus finds which one of a large number of sectors should be read by using the sector address as a clue.

The user data area stores data of 2 KByte length. The error correction code storage area stores an error correction code for the user data area in the same sector. The disk reproducing apparatus performs error detection using the error correction code when reading the user data area of the same sector, and performs error correction as well, thereby guaranteeing the reliability of data reading.

(1.1) Logical Structure of Optical Disk FIG. 3 is a diagram showing the logical structure of an optical disk. In FIG. 3, the physical sectors are arranged in ascending order according to the sector address, and the lead-in area, the volume area following the lead-in area, the volume area following the lead-in area, and the lead-out area following the volume area are identified by the identification information included in the sector address. They are roughly divided into areas.

In the "lead-in area", data for stabilizing operation at the start of reading of the DVD player and the like are recorded. On the other hand, the "lead-out area" is an area for notifying the playback apparatus of the end of playback, and has no significant data recorded therein. The “volume area” is an area in which digital data constituting an application is stored.
It manages the physical sector to which it belongs as a logical block. A logical block is identified by a unit in which consecutive physical sectors are assigned serial numbers, with the first physical sector of the data recording area being numbered zero. A circle b301 in FIG. 3 shows a logical block group in the volume area. Numerical values such as #m, # m + 1, # m + 2, # m + 3,... Assigned to many logical blocks in a circle are logical block numbers.

As shown in FIG. 3, the volume area is further divided into a volume management area and a file area.
In the volume management area, according to ISO13346,
File system management information for managing a plurality of logical blocks as a file is stored. The file system management information is information that clearly indicates the correspondence between the file names of a plurality of files and the addresses of the logical blocks occupied by each file, and the disc playback device uses this file system management information as a clue. To implement disk access in file units. That is, given a file name, all logical block groups occupied by the file are calculated by referring to all system management information, and these logical block groups are accessed to extract only desired digital data.

FIG. 4 is an explanatory diagram of a file area. FIG.
As shown in the figure, the file area contains a video manager (Vi
deo Manager) and multiple video title sets (VideoTi
tleSet) is stored. These are composed of a plurality of continuous files, and the recording location is calculated based on the file system management information. The reason for this being a continuous file is that the data size of the moving image data is enormous, and if this is made into one file, the file size becomes 1 GB.
It is because it exceeds.

The video title set groups and stores one or more DVD applications called titles. A plurality of titles grouped in a movie application corresponds to a case where there is a theater release version or an uncut version of the same movie. This is because the titles such as theatrical release version and uncut version share a lot of video data, and it is more efficient to use video by grouping and managing them.

Of the video title sets shown in FIG. 4, video title set V1 contains interactive software. Video title set V1 is interactive software "Aerobics". This interactive software is realized by the characteristic data structure of the optical disc in this embodiment. The interactive software "Aerobics" is a title set composed of three titles, each of which is referred to as a <waist slim course>, <an arm shape up course>, and <total fitness course>.

The video manager stores information on a menu for the user to select a title to be reproduced from all titles stored in a plurality of video title sets. Hereinafter, the video title set and the video manager will be described in detail. (1.1.1) Logical Structure—Video Title Set FIG. 5 is an explanatory diagram of the data structure of the video title set.

The video title set stores a plurality of video objects (VOB: Video Object) and video title set management information for managing the reproduction order of the plurality of video objects. (1.1.1.1) Video title set-Video object (VOB) "Video object (VOB)" is a digital video,
This is multimedia data by including digital voice, image data, and their management information.
Since this example is interactive software "Aerobics", each VOB # 1, 2, 3, 4,... Shown in FIG.
・ ・ Each exercise is rhythmically stepping, right leg and left leg are raised, jump is jumping, right is twisted around left and right, upper body is leaning forward This corresponds to one scene having a length of about 1 to 2 minutes, such as a scene in which a scene is made to appear.

The data structure of the "video object (VOB)" has a configuration in which a plurality of VOB units (VOBU) are arranged in chronological order from the head. The VOB unit (VOBU) is reproduction data of about 0.5 to about 1.0 second, and includes a management information pack, a moving image pack, and audio packs A to C as shown in a detailed configuration at an arrow in FIG. , And sub-picture packs A and B. Each of the pack data has a data size of 2 KBytes. By collecting and re-integrating the pack data for each type, the digital data becomes a digital data string constituting moving image data, audio data, sub-picture data, and control information. In addition, the digital data sequence re-integrated for each type may be referred to as an elementary stream, and the VOB may be referred to as a program stream or a system stream including a plurality of elementary streams.

In FIG. 5 and FIG. 6, the pack data of all the VOB units are arranged with regularity in order to make the explanation easy to understand. However, except that the management information pack is arranged at the top, the playback device Therefore, it is not necessary to arrange them adjacent to each other for each type, and they are actually mixed and arranged. In addition, the total number of packs belonging to the VOB unit and the number of packs for each type do not need to be the same because moving images, audio, and sub-pictures include variable-length compressed data. . Also, although there are two moving image packs in the VOB unit, the transfer rate to the playback device assigned to the moving image is about 4.5 Mbit. Hundreds of video packs will be included.

A moving image pack stored in a video object (VOB) is composed of at least one GOP by digital data of a moving image pack belonging to one VOB unit.
(Group Of Picture) digital moving image data is formed. Here, the GOP (Group Of Picture) is one unit when the compressed digital moving image data is decompressed, and is image data of about 12 to 15 frames. still,
For GOP, see MPEG2 (Moving Picture Expert).
Group, ISO11172, ISO13818) defines details.

FIG. 6 shows the relationship between each pack in a video object (VOB) and one scene of a moving image. In the figure, a video material of one scene of a moving image is shown by a horizontally long rectangle, and is arranged above the VOB. Also, three channels of audio material are indicated by three horizontally long rectangles, and are arranged below the VOB. Further, two-channel sub-picture materials are shown by two horizontally long rectangles, and are arranged below the sound material. The downward arrow extending from the moving image material indicates how the moving image material is recorded in the data field of each pack.

Following these downward arrows, moving pictures from the beginning of one scene to 0.5 second are MPEG-compliant I picture (Intra-Picture) and P picture (Predictive-Pict).
ure), B picture (Bidirectionally predictive Pictu)
It can be seen that the data is encoded in the data field of the video packs 1 and 2 in the VOB unit 1 after being encoded into (re) (note that, as described above, it is actually stored in several hundred packs. For the sake of convenience, the description will be continued below assuming that the contents are stored in two packs.) The moving image from 0.5 seconds to 1.0 seconds is also encoded into I-picture, P-picture, and B-picture, and then recorded in the data fields of the video packs 3 and 4 in the VOB unit 2. Although not shown, from 1.0 second
The moving image up to 1.5 seconds is also encoded and recorded in the data field of the video pack in the next VOB unit.

One of interactive software scene 3
The relationship between the dubbed voice of the channel and the data field of the audio pack will be described with reference to FIG. Similarly to the video pack, the arrow extending from the audio material in FIG. 6 to the VOB audio pack indicates that three-channel audio data is encoded by the above two methods and recorded in the data field of each audio pack in 0.5 second units. Is shown. That is, the dubbed voice of the A channel from the beginning of the one scene to 0.5 seconds is recorded in the data field of the audio pack A-1 in the VOB unit 1, and the dubbed voice from 0.5 seconds to 1.0 second is recorded in the VOB unit 2. Is recorded in the data field of the audio pack A-2. Although not shown, the audio from 1.0 second to 1.5 seconds from the beginning is recorded in the data field of audio pack A-3 in the next VOB unit. As described above, since the synchronization timing of the audio with the moving image is determined by the PTS, it is not necessary that audio data that completely matches the moving image data included in the VOB unit be included in the same VOB unit. It may be stored in the previous VOB unit.

Similarly, the dubbed sound of the B channel from the beginning of the one scene to 0.5 second is recorded in the data field of the audio pack B-1, and the dubbed sound from 0.5 second to 1.0 second is the data of the audio pack B-2. Recorded in the field. Although not shown, the sound from 1.5 seconds to 2.0 seconds from the beginning is recorded in the data field of the audio pack B-3.

The dubbed sound of the C channel from the beginning of one scene to 0.5 seconds is recorded in the data field of the audio pack C-1, and the dubbed sound from 0.5 seconds to 1.0 second is recorded in the data field of the audio pack C-2. Be recorded. Although not shown, the audio for 1.5 seconds to 2.0 seconds is recorded in the data field of the audio pack C-3.

The three-channel data distributed and recorded in the respective data fields of the audio packs A to C are hereinafter referred to as audio data A, audio data B, and audio data C. For example, by setting an English voice-over sound to audio data A, setting a French voice-over sound to audio data B, and setting a Japanese voice-over sound to audio data C, the operator can switch between them. .

In the example of FIG. 6, since sub-picture packs A and B in the VOB unit exist, it is possible to disperse and record the subtitles of two channels in the data fields of the sub-picture packs A and B in each VOB unit. it can. For example, by displaying subtitles in English with the sub-picture data A and displaying subtitles in French with the sub-picture data B, the operator can switch between them.

One management information pack is always arranged at the head of the VOB unit, and the transfer rate required during the reproduction of the VOB unit and the transfer required for each moving picture stream, audio stream, and sub-picture stream. Stores the specification of the rate and buffer size. It is more than general-purpose function of management information pack and sub-picture pack,
In the interactive part of the interactive software, the sub-picture pack and the management information pack have an organic association. This association exists when the sub-picture pack draws a menu including several items. As described above, when the sub-picture pack draws a menu, the management information pack belonging to the same VOB unit as the sub-picture pack includes highlight information for performing playback control according to a cursor operation on a menu and a confirming operation on an item. It has information called inside. A representative example of the “reproduction control according to the confirmation operation” in the present embodiment is a reproduction path branch that switches from the current reproduction path to another reproduction path. In this “switch playback path”, a command called a highlight command is described in the highlight information in association with each item, and this command is executed when the management information pack is read out to the disk playback device. It is done by doing. By selectively executing the command associated with the item according to the confirmation operation in this way, the reproduction path is switched in units of PGC information described later.

The description of the video object (VOB) of the video title set in FIG. 5 is now completed, and the structure of the video title set management information of the video title set will be described next. (1.1.1.2) Video title set management information The video title set management information stores information for managing a plurality of reproduction orders of the video object group described above. In a DVD, data that specifies the playback order of a group of video objects is called a program chain (PGC). That is, in the case of the video title set storing “aerobics” in this example, the video title set management information indicates how the scene should be developed when each of the waist slim course and the arm circumference shape up course is selected. Are stored.

FIG. 7 is a diagram showing the internal structure of the video title set management information. As indicated by reference numeral a5 in FIG. 7, the video title set management information includes a video title set management table, a video title set section title search pointer table, and a PGC management information table. "Video title set management table"
This is header information of the video title set management information, and stores pointers to storage positions of the video title set section title search pointer table and the PGC management information table.

The “video title set title search pointer table” is an index of a plurality of program chains stored in the PGC management information table, and is a pointer to a storage position of a program chain to be executed first for each title. Is specified. In this example,
Entries for each of the aerobics waist slim course and arm shape up course
Stores PGC information in association with each other.

The "PGC management information table" has a reference a
As shown in FIG. 6, a plurality of PGC information 1, 2, 3, 4 for all video objects stored in the video title set
... N is stored. Each piece of PGC information is information that specifies which VOBs are read out via the optical pickup and in what playback order. "Which VOB to read"
Is defined in the “VOB position information table” indicated by reference numeral a7.
It is defined by the “PG playback mode” shown in a9.

The "VOB position information table" includes a list of VOB position information. The internal structure of the VOB position information is shown next to FIG. 8A. As shown in the figure, the VOB position information is information composed of a VOB playback time, an offset to the VOB, and the number of VOB blocks. At the time of reading the VOB, the disk reproducing device calculates the logical block number of the logical block in which the VOB is recorded, using the offset number and the like included in the VOB position information as a clue, and is designated by the “number of blocks”. The logical blocks on the track are scanned by the number in the forward direction.

The "PG playback mode" defines whether each VOB in which the VOB position information is described in the "VOB position information table" is read out by normal playback or by random playback / shuffle playback. The difference between normal playback and random playback / shuffle playback is that in normal playback, the VOBs of the VOB location information are read out in a row in the “VOB location information table”, whereas in random playback / shuffle playback, the VOB location information is read. Is read out at random.

The difference between the random reproduction and the shuffle reproduction is that the combination in the random reproduction includes the redundant reading of the VOB, whereas the combination in the shuffle reproduction does not include the redundant reading of the VOB. In other words, in the shuffle reproduction, the VOB reproduced once is not reproduced again during the shuffle reproduction. In random reproduction, the same VOB can be reproduced in duplicate.

More specifically, the VOB position information of the PGC information is “VOB” of five VOBs of VOB # 1, 2, 3, 4, and 5.
Position information table ”is described. This PG
It is assumed that the PG reproduction pattern of the C information sets the number of repetitions three times and the shuffle reproduction. From the five VOBs, three VOBs are reproduced without allowing duplication. in this case,
For example, VOBs are read in the order of VOB # 5, 1, 3 or VOB # 2, 3, 5.

VOB position information of another PGC information is VOB # 6,
It is assumed that “VOB position information table” of five VOBs 7, 8, 9, and 10 is described. It is assumed that the PG reproduction pattern of the PGC information sets the number of repetitions three times and random reproduction. From the five VOBs, three VOBs are reproduced while allowing overlap. In this case, for example, VOBs are read in the order of VOB # 5, 5, 3 or VOB # 2, 3,3.

FIG. 8B shows the data structure of the PG reproduction mode. The PG playback mode is 8 bits long, of which the upper one bit is referred to as a first field `and the lower seven bits are referred to as a second field`. If a value of 1 or more is set in the second field, and if the first field is 0, the program chain is set to random playback. In the second field, one or more numerical values are set, and if the field 1 is 1, the program chain is set to shuffle reproduction. The second field specifies the number of repetitions of random playback / shuffle playback. Since the second field is 7 bits long, the number of repetitions can be set in the range of 1 to 127. If the second field is 0, the VOB described in the VOB position information table is normally reproduced.

The data structure of each piece of PGC information shown in FIG. 7 is as described above. Next, how the description contents of the VOB and each piece of PGC information of the video title set shown in FIG. 7 are different from each other will be described with reference to FIGS. 9 and 10. FIG. FIG. 9 summarizes the video contents of each VOB shown in FIG. 5 in a table format. Referring to this figure, VOB # 1 includes a live-action video of a rhythmically stepped shot as moving image data, and VOB # 2 includes a live-action video of a shot of raising the right and left legs. It can be seen that it is included as moving image data. VOB # 3 contains live-action video of the instructor stretching and rotating both arms horizontally as moving image data, and VOB # 4 contains live-action video of the instructor jumping and capturing moving image data. It can be seen that it is included as. As described above, in the VOB shown in FIG. 7, it can be understood that the video of 2 minutes and 3 minutes in length showing the instructor performing various exercises is recorded as an individual VOB.

FIG. 10 shows the correspondence between each course and the contents of the PGC information in a table format. The horizontal line in this figure shows the “Course name”, the “Program chain number” corresponding to the course, and the program chain number.
The contents of the “VOB position information table” and “PG playback mode” of the PGC information are shown in a table format. In this figure, the entry program chain of the "arm circumference shape up course" is PGC information # 1. This PGC information # 1 "VOB
FIG. 9 of the 30 VOBs
The VOB position information of 15 VOBs related to the movement around the arm, such as VOB # 3, VOB # 5, and VOB # 8, is designated. Further, "shuffle designation" is designated in the PG playback mode. The number of repetitions in this shuffle reproduction is set to “10”. In this way, the PG playback mode specifies that 15 VOBs are to be shuffled.

In general, a combination n that takes r out of n VOBs
Since Cr is represented by a calculation formula of nCr = n! / R! (Nr) !, 3003 different reproduction orders are generated by the calculation of 15C10 = 15! / 10! .5 !. That is, 3003 different orders
VOB will be selected. In this figure, the entry program chain for “West Slim Course” is PGC
Information # 2. The “VOB position information table” of the PGC information # 2 includes VOB # 6, VOB # 7, VO out of 30 VOBs.
Twelve VOBs related to waist circumference and upper body exercise such as B # 9
VOB location information is specified. Further, "shuffle designation" is designated in the PG playback mode. The number of repetitions in this shuffle reproduction is set to “10”. As described above, since the PG playback mode specifies that 10 VOBs are to be shuffle-reproduced, VOBs are selected by the number of combinations of 12C10.

In general, a combination n taking r from n VOBs
Since Cr is represented by a calculation formula of nCr = n! / R! (Nr) !, 66 different reproduction orders are generated by the calculation of 12C10 = 12! / 10! .2 !. That is, VOBs are selected 66 times in a different order. In this figure, the title “Total Fitness Course” is associated with “PGC3”. Furthermore, the V of the "VOB position information table" in PGC information 4
The number of OBs is 5, and “random designation” is designated in the PG playback mode. The number of repetitions in this random reproduction is set to “3”. As described above, since the PG playback mode specifies that five VOBs are to be randomly played back, VOBs are selected by the number of overlapping patterns of 5H3.

Here, the overlapping combination nHr taking r times by allowing the same thing to be taken out of n VOBs is nHr = n
+ r-1Cr = (n + r-1)! / r! (n-1) !, so that 5H3 = (5 + 3-1)! / 3! .4! The same playback order occurs. Total fitness course
Since the number of VOBs and the number of repetitions are small, and the same VOB is selected many times, even a fat person or a person who is not confident in the reflexes can keep up. On the other hand, the “arm circumference shape up course” has a large number of VOBs and repetitions,
In addition, since the selected VOB changes rapidly, advanced reflexes and physical strength are required. This is apparent from the above calculation result, and the number is more than 20 times (3003 ways) compared to 126 cases for beginners. With such a large number of VOB selections, aerobics that can be satisfied by advanced users can be realized.

As described above, depending on the setting of the PG playback mode, the title creator can provide an aerobics curriculum of several stages such as advanced, intermediate, and elementary on one optical disc. Digest 1 corresponds to PGC information # 4. The PGC information # 4 is a course for sequentially reproducing 15 of the 30 VOBs from the beginning to the middle, and the number of repetitions is set to 0. Since 0 is set, PGC information # 4 is a course for sequentially reproducing 15 VOBs from the beginning to the middle of the 30 VOBs in the digest version 1. These are for those who just want to watch the aerobics exercise without doing any physical exercise.

(1.1.2) Logical Structure-Video Manager The video manager consists of a video object and a PGC.
It consists of a management information table and can be said to conform to the data structure of the video title set. The difference between the VOB of the video manager and the VOB of the video title set is that the video manager is specialized for the volume menu. Here, the volume menu is a menu for displaying a list of all the titles recorded on the optical disc and selecting one of the titles. The optical disc is loaded into the disc reproducing apparatus, and the optical pickup is moved to the volume management area. Is displayed on the screen immediately after moving to the volume area.

Since the video menu is specialized for the volume menu, there are the following first and second differences between the video manager and the video title set. First,
In addition, the VOB of the video title set includes moving image data, a sub-picture pack, and an audio pack, whereas the VOB of the video manager only includes a sub-picture pack for a menu and a management information pack. . Secondly, the video manager describes a branch command in which titles of several video title sets on the optical disc are set as branch destinations.

FIG. 21 shows the data structure of the video manager. As shown in FIG. 21, “Video Manager”
"Video object for menu", "PGC for menu"
Management information table "and" title search pointer table ". “Video object for menu” is, as its name implies, a VOB specialized for a volume menu. That is, it includes a sub-picture pack for displaying a volume menu and a management information pack for performing reproduction control according to a cursor operation and a confirmation operation on the menu. FIG. 22 is an explanatory diagram of a display image for the volume menu. The video object for the volume menu includes a plurality of items y611, y612, y613, y61.
With 6. These items are contents for specifying any one of the titles such as “Aerobics <Arm circumference shape up course>” and “Aerobics <Waist slim course>”. When the user performs a determination operation on such an item, the VO
A command in which each video title set included in the management information pack existing in B and each title is a branch destination is executed, and a title to be reproduced is specified.

"Menu PGC management information table"
This is PGC information specialized for a volume menu, and describes the recording location of the menu VOB so that the menu VOB is read out when loaded into the playback device. The PGC information is read out by the playback device immediately after the optical disc is loaded in the playback device and the optical pickup moves from the volume management area to the volume area. As a result, the volume menu appears on the screen.

The “title search pointer table” is
This is an index for specifying the title set to which each title belongs and the title number assigned to each title in the title set. (2.1) Outline of Disc Reproducing Apparatus An optical disc reproducing apparatus (DVD player) will be described. FIG. 11 is a diagram showing the appearance of the DVD player 1, the television monitor 2, and the remote controller 91.

The DVD player 1 has an opening at the front of the housing, and a drive mechanism for setting an optical disk is provided in the depth direction of the opening. On the front of the DVD player, a remote control receiving unit 92 having a light receiving element for receiving infrared rays emitted by the remote control is provided.
2 generates an interrupt signal indicating that the key signal has been received.

A video output terminal and an audio output terminal are provided on the back of the DVD player. By connecting an AV code to this terminal, a video signal reproduced from the DVD can be output to the large television monitor 2 for home use. Can be. As a result, the operator can enjoy DVD playback images on a large-sized home television such as a 33-inch or 35-inch television. As can be seen from the above description, the DV of the present embodiment
The D player 1 is not used by being connected to a personal computer or the like, but is used together with the television monitor 2 as household electrical equipment.

The remote controller 91 is provided with a keypad which is biased by a spring on the surface of its housing, and outputs a code corresponding to a pressed key by infrared rays. (2.2) Components of Disc Playback Device FIG. 12 is a block diagram showing the internal configuration of the DVD player according to the present embodiment. The DVD player includes a drive mechanism 16, a mechanism control unit 83, a signal processing unit 84,
It comprises a V decoder unit 85, a remote control receiving unit 92, and a system control unit 93. Further, the AV decoder unit 85
It comprises a signal separating section 86, a video decoder 87, a sub-picture decoder 88, an audio decoder 89, and a picture synthesizing section 90.

The drive mechanism 16 includes a base on which an optical disk is set, and a spindle motor 81 which clamps the set optical disk and drives it to rotate. The base on which the optical disk is set is moved in and out of the housing by an eject mechanism (not shown). The operator mounts the optical disk with the base moved to the outside of the housing. When the optical disk is mounted on the base and the base moves inside the DVD player, the optical disk is loaded on the DVD player.

The mechanism control unit 83 controls a mechanism system including a motor 81 for driving the disk and an optical pickup for reading signals recorded on the disk. Specifically, the mechanism control unit 83 adjusts the motor speed according to the track position specified by the system control unit 93. At the same time, the pickup position is moved by controlling the actuator of the optical pickup, and when an accurate track is detected by servo control, rotation is waited until a desired physical sector is recorded, and continuous from the desired position. Read the signal.

The signal processing section 84 performs processing such as amplification, waveform shaping, binarization, demodulation, and error correction on the signal read from the optical pickup, converts the signal into a digital data string, The data is stored in a buffer memory (described later) in logical block units. The AV decoder 85 performs a predetermined process on the input digital data, which is a VOB, and converts the digital data into a video signal or an audio signal.

The signal separating section 86 receives the digital data string transferred from the buffer memory in logical block units, and sorts moving picture data, sub-picture data, and audio data. In this distribution, the moving image data is output to the video decoder 87. The audio data is output to the audio decoder 89, and the sub-picture data is output to the sub-picture decoder 88. The management information pack is output to the system control unit 93. At this time, the number of the signal separation unit 86 is specified by the system control unit 93.
This number corresponds to the audio data A,
B, C, or sub-picture data A, B. When the number is given, the signal separation unit 86 outputs the number to the audio decoder 89 and the sub-picture decoder 88, respectively. Then, the data other than the number is discarded.

The video decoder 87 decodes and decompresses the moving picture data input from the signal separating section 86, and outputs it as a digital video signal to the video synthesizing section 90. When the sub-picture data input from the signal separation section 86 is run-length compressed image data, the sub-picture decoder 88 decodes and decompresses the decoded data and outputs the decoded data to the video synthesis section 90 in the same format as the video signal. I do.

The audio decoder 89 includes a signal separating unit 8
6, and decodes and decompresses the audio data inputted thereto, and outputs it as a digital audio signal. Video synthesis unit 9
0 is the output of the video decoder 87 and the sub-picture decoder 88
Are mixed at the ratio instructed by the system controller 93 to output an NTSC signal. (2.2.2) Components of Disc Playback Apparatus—Internal Configuration of System Control Unit 93 The system control unit 93 controls the entire DVD player and has the internal configuration of FIG. According to FIG. 13, the system control unit 93 includes a buffer memory 94, a management information pack buffer 95, an embedded processor 96, and a PGC information buffer 31.

The buffer memory 94 has amplification, waveform shaping,
Data that has undergone processing such as binarization, demodulation, and error correction is written. If the written data is video title set management information, it is loaded into a buffer (not shown). On the other hand, in the case of VOB, the system control unit 93 transfers the data to the signal separation unit 86 one by one. If you transfer like this, AV
The management information pack is returned from the decoder unit 85.

The management information pack buffer 95 is a buffer for storing the management information pack sent back from the signal separation section 86. The embedded processor 96 is configured by integrating a ROM storing a control program for the entire DVD player 1, a working memory, and a CPU. The PGC information buffer 31 stores the currently selected PGC information.

The work buffer 97 includes a system control unit 96.
Is a buffer used for expanding the one-dimensional array "random number list" and the variable "designated number" when performing the processing of the flowchart shown in FIG. (2.3.2.1) Overall Flow of System Control Unit 93 FIG. 14 is an overall flow showing the processing contents of the system control unit 93. The operation of the DVD player 1 will be described with reference to FIG. When the eject button of the DVD player 1 is pressed, the base moves to the outside of the housing. With the base moved outward, the operator mounts the optical disk. When mounted on the base and the base moves inside the DVD player, the optical disc is loaded into the DVD player. In step 121, the system control unit 93 is in a state of waiting for insertion of an optical disk. When the loading of the optical disk is notified from an optical sensor or the like, the rotation of the disk is controlled by controlling the mechanism control unit 83 and the signal processing unit 84 while keeping the optical pickup 82 in the lead-in area. The rotation of the disk kept in the lead-in area is continued until the rotation operation is stabilized. When the rotation operation is stabilized, the optical pickup is moved from the lead-in area to the outer periphery and the volume management area is read. The video manager is read based on the information of the volume management area (step 122). Further, the system control unit 93 refers to the menu PGC management information table of the video manager, calculates the recording address of the volume menu program chain, reproduces it, and stores it in the PGC information buffer 31. If the program chain for the volume menu is held inside, the system control unit 93
With reference to the held PGC information, a video object (VOB) to be reproduced and its recording address on the optical disk are calculated. When the video object to be reproduced is determined, the system control unit 93 outputs a control signal to the mechanism control unit 83 and the signal processing unit 84, retrieves the determined video object from the optical disc, and reproduces it. As a result, the volume menu shown in FIG.
(Step 123).

Looking at the list of titles, the operator considers his / her weight, decides which course is the most necessary, and considers "Aerobics <arm-up shape-up course>" to be the most necessary. It was determined that there was. Then, it is assumed that the menu item of the course is selected and confirmed. The video manager stores a branch command in association with the menu item and a title number as a parameter thereof, and the highlight command is executed by the system control unit 93 (step 125).

As an execution operation according to the branch command, the system control unit 93 refers to a title search pointer table which is a part of the video manager, and determines a video title set (VTS) to which the system belongs and a title number in the VTS. When the video title set is determined, the system control unit 93 outputs a control signal to the mechanism control unit 83 and the signal processing unit 84, reproduces the video title set management information of the determined title set, and outputs one of the video title set management information. The video title set section title search pointer table which is a section is taken out (step 12).
6).

If the video title set section title search pointer table can be extracted, the system control section 93
Refers to this and determines PGC information of a program chain for starting reproduction of a title to be reproduced. When the PGC information is determined, the system control unit 93 outputs a control signal to the mechanism control unit 83 and the signal processing unit 84, reproduces the determined PGC information, and stores this in the internal PGC information buffer 31. In this case, the stored PGC information for the volume menu is overwritten. If the PGC information for starting the reproduction of the title is held, the system control unit 93
Determines the video object to be reproduced and its recording address with reference to the held PGC information, and outputs a control signal to the mechanism control unit 83 and the signal processing unit 84 to reproduce the determined video object.

Thereafter, the system control unit 93 executes the held PG
According to the C information, the video objects to be reproduced are sequentially determined and the reproduction control is performed. When the reproduction of the final video object indicated by the PGC information is completed, the system control unit 93 refers to the PGC connection information that is a part of the PGC information and determines the next PGC information. The system control unit 93 that has determined the next PGC information discards the current PGC information, retains the next PGC information, and continues the reproduction in accordance with this (step 128).

To supplement the reproduction of the video object, the DVD player 1 is provided with a key (not shown) for switching between an audio channel and a sub-video channel. The audio channel and the sub-video channel selected by the user with the switching key are held in a system register (not shown) of the system control unit 93. When a video object is played, the system control unit 93 refers to an internal system register and specifies a valid channel.
The control signal is output to the AV decoder unit 85. As a result, only valid audio channel and sub-video channel information is output to the outside together with the moving image information.

(2.3.2.2) First Operation Example Reproduction Control for Video Title Set V1 Referring to the flowcharts of FIGS. 15 and 16, FIG.
The software control of the system control unit 93 for the video title set V1 shown in FIG.
Now, "Aerobics <Arm circumference shape up course>"
Is selected, the PGC information buffer 31 stores the PGC information # 1. In this state, the system control unit 93 performs a reproduction order determination process. The playback order determination process is a menu
When the program branches to the program chain, the playback order is determined according to the description contents of the PG playback mode.
5 is realized by multiple branches shown in the flowchart. In step 140, the PG reproduction mode is read from the PGC information. In this step, the PG playback mode specified in the figure is read. After the reading of the PG reproduction mode, the process proceeds to step 141. In step 141, the read
The bit pattern of the second field in the PG playback mode is "00
0 0000 ”. In FIG. 10, PGC information # 1
In the second field of "10 repetitions", that is, "000 101
0 ”is described, the flow shifts to step 142.

In step 142, it is determined whether the bit pattern of the first field is "1". P in FIG.
Since the first field of the GC information # 1 is set to “1”, the process proceeds to step 144. The processing of the system control unit 93 in the shuffle reproduction will be described with reference to the flowchart of FIG. In this flowchart, the "random number list" is a one-dimensional array for keeping a history of random numbers generated so far in shuffle reproduction. The “total number n” is the number of VOB position information described in the VOB position information table. In the case of PGC information # 1, it is “15” as described above. The “designated number k” is a variable for storing the number of loops of the loop processing including steps 152 to 159.

When the process proceeds to step 144 in the flow of FIG. 15, step 150 in the flowchart of FIG.
Then, the designated number of times is read from the bit pattern of the second field and stored in the counter. Since the second field is 7 bits long, the number of repetitions in the range of 0 to 127 is specified. After execution of step 150, step 15
Move to 1. In step 151, the random number list is cleared to all zeros. After the execution of step 151, the process proceeds to step 152, where random numbers (0 <r <n + 1) in the integer range from 1 to the total number of VOBs 15 are generated. Here, it is assumed that the integer 3 has occurred. In the present embodiment, it is assumed that a uniform random number is generated in order to uniformly select VOBs described in the “VOB position information table”. In addition, random numbers having an arbitrary distribution such as Gaussian random numbers may be used. Weighting may be performed so that exercises in the latter half, which tend to be less frequent, are selected more frequently.

After execution of step 152, step 153
Move to In step 153, it is determined whether the generated numerical value 3 is described in the random number list or not.
Since the PGC information has just been selected, the PGC information has not been described, and therefore the flow proceeds to step 154. In step 154, the third VOB position information in the "VOB position information table" is read. In step 155, based on the VOB offset described in the "VOB position information", it is calculated which part of the spiral track on the disk the logical block to be read occupies. Then, the track position is instructed to the mechanism control unit 83, and the optical pickup is moved to the recording start position. After that, it instructs the mechanism control unit 83 to perform block read control.

In step 156, the processing of the following step 157 is repeated for all the logical blocks occupied by the VOB. The processing of step 157 includes the steps of: writing data recorded in the logical block #k;
That is, it is read out via the signal processing unit. Under the control of the mechanism control unit 83 and the signal processing unit 84, data of the logical block occupied by the VOB is sequentially read. The read data is separated and reproduced by the AV decoder unit 85. At this point, the separated video is displayed on the television screen shown in FIG. 24, and audio output based on audio data is started. As a result, on the screen of the television monitor, a live-action video image of the instructor rotating both arms horizontally and rotating as shown in FIG. 18 is displayed for about several minutes. During this time, light BGM is flowing from the speaker, and the operator performs the same exercise as the movement of the instructor on the screen according to the rhythm of the BGM.

When the above processing is repeated for all the logical blocks described in the “VOB position information” of VOB # 3, the processing shifts to step 158 to add the integer 3 to the random number list. After execution of step 158, the process moves to step 159. In step 159, the designated number k stored in the counter is reduced by one. In step 159, it is determined whether or not the designated number k is equal to or greater than zero. Since it is 0 or more in the first cycle, the process proceeds to step 152 to generate random numbers.

In step 152, a random number (0 <r <n + 1) in an integer range from 1 to the total number n of VOBs is generated. Here, it is assumed that the integer value 3 has occurred. After execution of step 152,
Move to step 153. In step 153, it is determined whether the generated numerical value 3 is described in the random number list or not. Here, since the integer value 3 is described in the list, the process returns to step 152 to generate a random number again.
If the regenerated random number is also described, repeat step 1
Returning to step 52, a random number is generated again.

While the random numbers already described in the list are being generated, the repetition of steps 152 to 153 is continued. By comparing the histories described in the random number list in this way, the already selected VOB is prevented from being redundantly selected. It is assumed that an integer value of 5 is generated as a random number as a result of regenerating the random number twice. Since the integer value 5 is not described in the random number list, the process proceeds to step 154. The VOB position information arranged fifth in the “VOB position information table” is read. In step 155, 5
Based on the VOB offset described in the second VOB position information, a calculation is made as to which track on the disk corresponds to the logical block to be read next. Then, the track position is instructed to the mechanism control unit 83, and the optical pickup is moved to the recording start position. After that, it instructs the mechanism control unit 83 to perform block read control.

In steps 156 and 157,
The data recorded in the logical block #k is read via the optical pickup and the signal processing unit. Under the control of the mechanism control unit 83 and the signal processing unit 84, the data of the logical block occupied by VOB # 5 is sequentially read. The read data is separated and reproduced by the AV decoder unit 85. At this point, the separated video is displayed on the television screen shown in FIG. 24, and audio output based on audio data is started. As a result, the screen of the TV monitor
For about several minutes, a live-action video of an instructor as shown in FIG. 19 extending his arm horizontally and swinging it down and crossing it in front of the abdomen is displayed. During this time, another light BGM is flowing from the speaker again, and the operator performs the same exercise as the movement of the instructor on the screen according to the rhythm of the BGM.

When the above processing is repeated for all the logical blocks described in the “VOB position information” of VOB # 3, the flow shifts to step 158 to add the integer value 5 to the random number list. As a result of this addition, "3" appears in the random number list.
"5" will be lined up. After execution of step 158, the process moves to step 159. In step 159, the designated number k stored in the counter is reduced by one. Step 1
At 59, it is determined whether or not the designated number k is 0 or more. In the second cycle, the process proceeds to step 152, where random numbers are generated.

At step 152, a random number (0 <r <n + 1) in an integer range from 1 to the total number n of VOBs is generated. Here, it is assumed that the integer value 8 has occurred. After execution of step 152,
Move to step 153. In step 153, it is determined whether the generated numerical value 8 is described in the random number list or not. Since “3” and “5” are described in the random number list, and the integer 8 is not described, the process proceeds to step 154.
The 8th VOB position information in the “VOB position information table” is read. In step 155, based on the VOB offset described in the "VOB position information", it is calculated which track on the disk corresponds to the logical block to be read next. Then, the track position is instructed to the mechanism control unit 83, and the optical pickup is moved to the recording start position. After that, it instructs the mechanism control unit 83 to perform block read control.

In steps 156 and 157,
The data recorded in the logical block #k is read via the optical pickup and the signal processing unit. Under the control of the mechanism control unit 83 and the signal processing unit 84, data of the logical block occupied by the VOB is sequentially read. The read data is separated and reproduced by the AV decoder unit 85. At this time, the separated video is displayed on the television screen of FIG. 24, and the audio output based on the audio data is started. As a result, on the screen of the television monitor, as shown in FIG. 20, the instructor stretches both arms and swings up to the height of the chest behind, and a live-action image of swinging up the arms to the front side is approximately shown. Appears for a few minutes. During this time, another light BGM is flowing from the speaker again, and the operator performs the same exercise as the movement of the instructor on the screen according to the rhythm of the BGM.

When the above processing is repeated for all the logical blocks described in the “VOB position information” of VOB # 3, the process proceeds to step 158, and the random number r is added to the random number list. After execution of step 158, the process moves to step 159. In step 159, the designated number k stored in the counter is reduced by one. In step 159, it is determined whether or not the designated number k is equal to or greater than zero. Step 1 on the third round
The process proceeds to step 52, where random numbers are generated.

Each time it is determined in step 153 that there is no description, the processing in steps 152 to 159 is repeated. Every time this cycle is completed, the count value is decremented by one in step 159 and the process proceeds to step 160.
By repeating step 159, the count value is decremented by one and approaches the lower limit 0. When the count value reaches the lower limit of 0, step 160 becomes Yes, and this flow chart ends. During this repetition, the instructor's exercises changed rapidly and the BG
Since M also switched rhythmically, the operator was able to sweat well in a short time.

If the same loading of the optical disk and the selection of the course are performed in the morning of the next day, the VOBs are arranged in a completely different order from yesterday.
Is played. In this way, the reproduction order changes rapidly, and the effect of the exercise appears to the operator. <Random Reproduction> Since random reproduction is a combination that may have an overlap, the embodiment of FIG.
What is necessary is just to cut off the comparison with the random number list in the chart. FIG. 17 shows a flowchart of the system control section 93 at the time of random reproduction constructed as described above. FIG.
As is clear from FIG. 7, in the shuffle reproduction, a specified number of times k is read out from the bit pattern of the second field and stored in the counter 150. Step 154 of reading the r-th position information No. r arranged in the "information table". 155, the step of repeating the number of blocks described in the “number of blocks” of the VOB position information, the step 156, the step of reading out the data recorded in the logical block #k via the optical pickup and the signal processing unit 157, Step 158 of reducing the designated number k by 1 and determining whether the designated number k is larger than 0 Step 159 are sequentially performed that.

<Normal Playback> In normal playback, VOBs are simply read out as described in the “VOB position information table”. Only the procedure of steps 156 to 157 in the flowchart of FIG. Then, if you select the "Waist Slim Course", you will see live action images of stepping rhythmically, raising your right and left legs, and jumping instructors. That is, "Arm circumference shape up course"
When the PGC information corresponding to is read into the disc playback device, the exercise around the arm is randomly selected and displayed on the screen,
When the PGC information corresponding to the “Waist Slim Course” is read into the disc reproducing device, the exercise around the waist is randomly selected and displayed on the screen.

As described above, according to this embodiment, the PGC information corresponds to each of the courses such as the “waist slim course” and the “arm circumference shape up course”.
For one piece of PGC information, the playback order is specified by the "VOB position information table" and the PG playback pattern so that the movement around the arm is selected at random, and another piece of PGC information randomly exercises the hips. Since the reproduction order is specified so that the selected one is reproduced, only the video related to the course is reproduced at random when each course is selected. Due to such random reproduction, the order of the above-described movement around the arms and the movement around the hips changes rapidly every morning when the course of the optical disc is selected. As a result, the operator's impression of courses such as the "Waist Slim Course" and the "Arm circumference shape up course" will always be fresh,
Every morning, you can enter aerobics with a fresh feeling.

In the present embodiment, one VOB unit is composed of one GOP. However, if the playback time of the moving image to be stored is about one second, the present invention is not limited to one GOP, and two or more GOPs may be used. It goes without saying that three GOPs having a very short reproduction time may be constituted. Further, in this case, the management information pack is arranged at the head of a plurality of continuous GOPs, and stores effective reproduction control information for the plurality of GOPs.

In the present embodiment, the moving picture information includes MPEG2
Although the description has been given of the case of digital moving image data of the system, moving image data capable of forming an object together with audio and sub-pictures is not limited thereto. For example, a digital moving image of the MPEG1 system and a DC used in the MPEG system are used.
Of course, it may be a digital moving image by a conversion algorithm other than T (Discrete Cosine Transform).

In this embodiment, the management information pack is arranged for each GOP which is a unit for restoring a moving image. However, if the compression system of a digital moving image is different, it is obvious that the compression unit is for each restoration unit of the compression system. . Lastly, a method of manufacturing an optical disc according to the present embodiment will be briefly described. The master prepares a number of video tapes taken by a video camera and music tapes recorded live, and digitizes the moving images and audio recorded on these tapes and uploads them to the nonlinear editing device. The editor creates menus and items using an application program such as a graphic editor while reproducing video and audio in frame units on the nonlinear editing apparatus. At the same time, a management information pack incorporating a highlight command is created using a GUI generator or the like. After creation, these are encoded according to the MPEG standard to generate moving picture data, audio data, sub-picture data, and management information packs. Once generated, VOB units are created from these on the non-linear editing device, and VOBs are created. When a VOB is created, a VOB number is assigned to the VOB, and PGC information # 1, # 2, # 3, # 4 ... # n, a video title set section title search pointer table, video title set management information Is created, and the above-described data structure is configured on the memory of the workstation.

After constructing the data structure, these data are converted into a logical data sequence so that they can be recorded in the file area. The converted logical data string is recorded on a transmission medium such as a magnetic tape, and further converted into a physical data string. This physical data string is obtained by adding ECC (Error Check Code), EF modulation, data of a lead-in area, data of a lead-out area, and the like to the volume data. Master cutting uses this physical data sequence to create an optical disk master. Further, an optical disc is manufactured from the master created by the press device.

In the above manufacturing flow, the existing CD manufacturing equipment can be used as it is, except for a part of the logical data string creating apparatus relating to the data structure of the present invention. This point is described in Ohm's "Compact Disc Reader" co-authored by Heitaro Nakajima and Hiroshi Ogawa, and Asakura Shoten "Optical Disc System", Optical Discourse of the Japan Society of Applied Physics.

[0100]

As described above, according to the present invention, in an optical disc having a volume area having a sector structure, the volume area includes a volume management area arranged at the innermost circumference of the volume area and a plurality of areas including moving image data. And an index area for storing reproduction control information indicating a reproduction order of a predetermined video object, and the volume management area includes:
An area having first position information indicating a position of a sector of the index area, wherein the index area is located near a predetermined video object indicated by the reproduction order information, and indicates a position of a sector of the predetermined video object. And a second position information indicating whether at least one of the predetermined video objects is to be reproduced randomly or all of the predetermined video objects are sequentially reproduced. Have been.

[0101] In the index area, reproduction order information indicating a reproduction order of a predetermined video object among the plurality of video objects, and reproduction index information in all the data areas of the predetermined video object indicated by the reproduction order information. Position information indicating a position and flag information indicating whether at least one of the predetermined video objects indicated by the reproduction order information is reproduced at random or all the predetermined video objects are sequentially reproduced are stored. Have been.

[0102] The disc reproducing apparatus reads the flag information from the optical disc, and indicates that the read flag information randomly reproduces any one of the video objects indicated in the reproduction order information. The read means is controlled based on the position information according to whether the predetermined video object is to be sequentially played back or whether all of the predetermined video objects are sequentially reproduced. Video objects.

Here, when a video for each course such as "slim legs" or "slim waist" is recorded as a predetermined video object, the target of random selection is "slim legs" according to the flag information. Objects are narrowed down for each course such as "reduce the waist", and the objects related to each course are read out and reproduced in an arbitrary order. By narrowing down the targets of the random selection in this way, the objects corresponding to the respective courses are reproduced in an arbitrary order while observing the regularity of the course constructed by the logical structure of the interactive software. Become. Therefore, at the time of reproduction of this optical disc, only the objects related to the course are reproduced alternately without causing confusion of the viewer and without using a troublesome user programming function, and it is possible to give the operator a freshness for a long time.

Therefore, the optical disk according to the present invention is useful for maintaining the freshness of video contents and preventing obsolescence, and is useful for further developing the market for interactive software of educational materials.

[Brief description of the drawings]

FIG. 1A is an external view of an optical disk according to an embodiment. (B) It is sectional drawing of an optical disk. (C) It is an enlarged view of the part irradiated with a light spot. (D) is a diagram showing a pit row on the information layer 109.

FIG. 2A is an explanatory diagram of a track arrangement in an information layer of an optical disc. (B) is an explanatory diagram of a physical sector in an information layer of an optical disc.

FIG. 3 is a diagram showing a logical structure of an optical disc.

FIG. 4 is an explanatory diagram of a file area of an optical disc.

FIG. 5 is an explanatory diagram of a data structure of a video title set.

FIG. 6 is a diagram showing a correspondence relationship between a moving image material, an audio material, a caption material, and each pack in a video object (VOB).

FIG. 7 is a diagram showing an internal structure of video title set management information.

FIG. 8A is a diagram showing an internal structure of a “VOB position information table”. (B) is a diagram showing a format of a PG reproduction pattern.

FIG. 9 is a diagram summarizing the contents of a real video image of moving image data of each VOB in a table format.

FIG. 10 is a diagram showing description contents of each PGC information in a video title set V2.

FIG. 11 is a perspective view showing the appearance of the reproducing apparatus according to the embodiment.

FIG. 12 is a block diagram illustrating an internal configuration of a DVD player 1 according to the embodiment.

FIG. 13 is a configuration diagram showing an internal configuration of a system control unit 93.

FIG. 14 is a flowchart showing processing contents of a system control unit 93;

FIG. 15 is a flowchart illustrating a procedure of a reproduction order determination process of the system control unit 93;

FIG. 16 is a flowchart showing a procedure at the time of shuffle reproduction by the system control unit 93;

FIG. 17 is a flowchart showing a procedure at the time of random reproduction by the system control unit 93;

FIG. 18 is an explanatory diagram showing display contents on a television monitor when VOB # 3 is being read.

FIG. 19 is an explanatory diagram showing display contents on a television monitor when VOB # 5 is being read.

FIG. 20 is an explanatory diagram showing display contents on a television monitor when VOB # 8 is being read.

FIG. 21 is a diagram showing an internal configuration of a video manager.

FIG. 22 is a diagram illustrating an example of a volume menu.

[Explanation of symbols]

 Reference Signs List 1 DVD player 2 TV monitor 16 Drive mechanism 31 PGC information buffer 81 Spindle motor 82 Optical pickup 83 Mechanism control unit 84 Signal processing unit 85 AV decoder unit 86 Signal separation unit 87 Video decoder 88 Sub-video decoder 89 Audio decoder 90 Video synthesis unit 91 Remote control 92 Remote control receiving unit 93 System control unit 94 Buffer memory 95 Management information pack buffer 96 System control unit 96 Processor 97 Work buffer 107 DVD 108 Transparent substrate 109 Information layer 110 Adhesive layer 111 Transparent substrate 112 Print layer 113 Light beam 114 Light spot

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H04N 5/93 H04N 5/93 Z G11B 27/00 D (72) Inventor Kazuhiko Yamauchi 191-407 Ishizuminamicho, Neyagawa-shi, Osaka No. (72) Inventor Kaoru Murase 367, Izumaki-cho, Ikoma-gun, Nara Prefecture 367 Presley Lu Kurihara 105 (72) Inventor Katsuhiko Miwa 1-4-4 Nonakaminami 4-chome, Yodogawa-ku, Osaka, Osaka, Japan

Claims (5)

[Claims] 1. An optical disc including a volume area having a sector structure, wherein the volume area includes a volume management area arranged at an innermost circumference of the volume area, and an area for storing a plurality of video objects including moving image data. An index area for storing reproduction control information indicating a reproduction order of a predetermined video object, wherein the volume management area is an area having first position information indicating a position of a sector of the index area; An area is located near a predetermined video object indicated by the reproduction order information, and second position information indicating a position of a sector of the predetermined video object;
An optical disc, comprising: an area having flag information indicating whether at least one of the predetermined video objects is reproduced randomly or all of the predetermined video objects are reproduced sequentially. 2. The optical disc according to claim 1, further comprising a lead-in area inside the volume area where reproduction by a reproduction apparatus is started. 3. The second position information indicates, in a table format, the positions of all sectors of the data area of the predetermined video object indicated by the reproduction order information, and the flag information includes the reproduction order information. Indicating whether at least one of the predetermined video objects indicated by is reproduced randomly or all of the predetermined video objects are sequentially reproduced in an arrangement order in a table. Alternatively, the optical disk according to claim 2. 4. The apparatus according to claim 1, wherein the index area further stores information on the number of times of random reproduction when the flag information indicates random reproduction. optical disk. 5. The flag information may be such that at least one of the predetermined video objects indicated by the reproduction order information is reproduced randomly while allowing duplication, or at least one of the predetermined video objects is reproduced. The optical disc according to any one of claims 1 to 4, wherein the information is information indicating whether reproduction is to be performed randomly with duplication prohibited or all of the predetermined video objects are sequentially reproduced.