JP3372036B2 - Recording method of recording medium, reproducing apparatus and reproducing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording method for a recording medium on which an information signal is recorded using a light beam , a reproducing apparatus,
More particularly, the present invention relates to a recording method for a recording medium on which an object including digital moving image data, audio data, and sub-picture data is recorded , a reproducing apparatus, and a reproducing method .

[0002]

2. Description of the Related Art In the flood of music software and video software,
Interactive software of various genres, such as aerobics, learning materials, and cooking materials, is in the spotlight as the next generation of video software. Interactive software is software in which there are multiple branches in the playback progress and the branch destinations are switched appropriately according to the operation by the operator, and a simple version of this has appeared as an application for current video CDs. There is. The first basic technology of interactive software is distributed recording.

That is, an image of about 1 hour length is not sequentially recorded on the spiral track, but is cut into several pieces such as several seconds and several minutes, and these are cut on a plurality of arcs of the spiral track. Record in random order. The second basic technique is random access in which video information cut into several pieces is read in an arbitrary order by a plurality of control information. The control information for random access is constituted by a pair of the reading order of the shredded video and the address information indicating the arc of the spiral track on which the video is recorded. As for this control information, there are many that have different combinations of the reading order, and the user can select one of them by a menu or the like.

By switching the reproduction progress according to the menu as described above, the interactive software described above presents a number of courses and allows the operator to select the one that suits his or her desires. An example of aerobics interactive software will be briefly described below. With aerobics interactive software, a live-action image of the instructor exercising is recorded on multiple optical disks. In addition, the playback path that suits the operator's exercise purpose, such as "thinning waist", "thinning foot", and "5 kg diet", is recorded on the optical disc. These reproduction paths correspond to one course, and are designated to selectively reproduce only the ones that match the user's purpose among the above-mentioned live-action images. For example, in the playback path of the "Thinning" course, among the live-action footage of the above instructor, rhythmically stepping, raising the right and left legs, jumping, etc. The playback path is specified to sequentially play the.

In the reproduction route of the "thinning waist" course, among the live-action images of the above instructor, live-action images around the waist, such as twisting the hip clockwise and counterclockwise and leaning the upper body forward, are sequentially displayed. The 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 disk is loaded into the disk reproducing apparatus. When the operator loads an optical disc into the disc reproducing device and selects one of the courses while considering his / her purpose of exercise, physical strength, and agility, the reproducing path suitable for that course is selected, and the disc reproducing device reproduces the reproduced track. A plurality of live-action images are sequentially read from the optical disc according to the route. The video thus read is decoded into a video signal and displayed on the television. If the operator performs the same exercise as the instructor in accordance with the displayed live-action image, the exercise can be easily performed at home. If you feel unsatisfied with the exercise as a result of trying the course or feel tired to follow the movement of the instructor, you can adjust the level by selecting another course.

[0006] As described above, the interactive software using the optical disk as a medium can switch the course according to the exercise ability and the purpose of the exercise, and is suitable for a housewife to easily perform a diet between housework.
It is perfect for office workers and office workers to solve their daily lack of exercise in a short time before going to work.

[0007]

However, the conventional interactive software has a problem that the sequence of the photographed images is the same every time even though the courses for each purpose are provided in various ways, and the user gets tired quickly. For example, in the case of aerobics, the order of lessons is the same every time, so the body adapts to that order. To put it flatly, it is the point that the mannerism becomes fast.

In order to overcome the above-mentioned mannerism, it may be conceived to utilize the random reproduction function of the disc reproducing apparatus. The random reproduction function is a function of randomly reproducing the recorded contents instead of reproducing them in a recording order, and is widely used as an automatic music selection function of music software. However, such a countermeasure is not very preferable for interactive software. This is because such a random reproduction function is intended to reproduce the entire recorded contents of the optical disc in random reproduction. If such random playback is performed on an optical disc on which interactive software is recorded, the sub-image of the menu, the image of the instructor raising his leg, and the image of waving his arm will be displayed in a mixed order. . Such mixed display causes the operator to be confused because he cannot understand what is being done on the screen.

The simple random reproduction of the recorded contents of the optical disk as described above merely unnecessarily destroys the logical structure for each course constituted by the reproduction path of the interactive software. In order to avoid such confusion and to display the live-action video in random reproduction, it is necessary to call on the operator to use the user programming function in the disc reproducing apparatus. The user programming function is a function for instructing the disc reproducing device which recording content is to be displayed in what order. Using this, the operator is urged to change the reproduction order of the live-action video for each course. This call is made mainly on the surface of the optical disk jacket, instruction manual, etc. The user programming function is a standard function of recent disk reproducing devices, and there is no problem in using it. However, the problem here is to ask the operator to use this function. That is,
Even if it is not so, asking a busy housewife or office worker for a program for the sequence of playback of live-action images and having them perform aerobics impairs the ease of using an optical disc. Could be shunned.

A first object of the present invention is to record a recording medium capable of randomly selecting and reproducing moving image data relating to a course selected by an operator without causing confusion in viewing . A reproducing device and a reproducing method are provided. A second object of the present invention is a recording medium recording method, reproducing apparatus, and reproducing method capable of randomly selecting and reproducing moving image data relating to a course selected by an operator without using a programming function. Is to provide a method .

[0011]

In order to achieve the above first and second objects, the present invention provides a plurality of video objects.
And define multiple playback courses for multiple video objects.
Recording multiple chain information and menu information
It is a recording method to record, and each chain information is
Information that appears in each playback course, including
The playback order of deo objects is a table for each chain information.
Video object belonging to the playback course
Are played sequentially according to the playback order in the table information.
Whether to let (1), a video object that belongs to the playback course
Or select (2) at random to play (2).
Flag information for each playback information, and select the operation for each playback course.
Show the menu that accepts the work in the menu information, and
Number of video objects, multiple chain information,
The new information is recorded on a recording medium.
The lag information includes reproduction count information, and the reproduction count information is
Belongs to the reproduction course by being set to the value “0”
Play order of video objects in table information
It is indicated that playback is performed sequentially according to (1) and set to the value “n”
Video objects that belong to the playback course
(2) indicating that a random object is randomly selected and played n times.
It is characterized by

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION
A digital video disk (hereinafter abbreviated as DVD) in which a recording capacity of about 4.7 GB on one side is realized on an optical disk having a diameter of 120 mm is suitable. In addition, in the following description, in order to facilitate understanding, it is described as follows. At that time, put the classification number on the left side of each item. The number of digits in the classification number means the hierarchical depth of the item. The highest classification numbers are (1) and (2), where (1) relates to an optical disc and (2) relates to a reproducing device (disc reproducing device). (1.) Physical structure of optical disc (1.1) Logical structure of optical disc (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 reproducing device (2.2) Components of disc reproducing device (2.2.1) Components of disc reproducing device-signal separation unit 86
Internal structure of (2.2.2) Components of disk reproducing apparatus-Internal structure of system control unit 93 (1.) Physical structure of optical disk FIG. 1 (a) is a diagram showing the external appearance of a DVD, and FIG. 1 (b).
Is a sectional view thereof. FIG. 1C is an enlarged view of the circled portion in FIG. The DVD 107 is configured by stacking 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 bottom of the drawing.

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

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

By irradiating these pit rows with the light beam 113, information is extracted as a change in the reflectance of the light spot 114 as shown in FIG. DVD
Since the numerical aperture NA of the objective lens is large and the wavelength λ of the light beam is small, the light spot 114 has a diameter of about 1 / 1.6 compared to the light spot on the CD.

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

The basic technology for realizing such a large capacity is the miniaturization of 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 / objective lens numerical aperture NA, the spot diameter D is narrowed down by making the laser wavelength λ smaller and the numerical aperture NA larger. be able to. It should be noted that when the numerical aperture NA of the objective lens is increased, coma aberration occurs due to the relative tilt between the disk surface and the optical axis of the light beam called tilt. In order to reduce this, in DVDs, the transparent substrate is made thin. When the transparent substrate is thinned, another problem that mechanical strength is weakened comes up, but in DVD, this is reinforced by bonding another substrate, and the problem of strength is overcome.

To read data from a DVD, the NA of the red semiconductor laser with a short wavelength of 650 nm and the objective lens is used.
An optical system whose (numerical aperture) is increased to about 0.6 mm is used. Combined with the fact that the thickness of the transparent substrate is reduced to around 0.6 mm, the information capacity that can be recorded on one side of an optical disc with a diameter of 120 mm has reached about 4.7 GB. With such a large capacity, it becomes possible to record one movie produced by a movie company on one common disc and provide it to many different languages. The recording capacity of 4.7 Gbytes realized by these basic technologies is surplus even if 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. 2 (b).
As shown in FIG. 3, it comprises a sector header area, a user data area, and an error correction code storage area. The sector address of the sector header area is used to identify each sector. The disk reproducing device searches for which one of a large number of sectors should be read out by using this sector address as a clue.

Data having a length of 2 Kbytes is stored in the user data area. The error correction code storage area stores an error correction code for the user data area of the same sector. The disc reproducing apparatus guarantees the reliability of data reading by performing error detection using an error correction code when reading the user data area of the same sector and even performing error correction.

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

In the "lead-in area", data for stabilizing the operation when the DVD player starts reading is recorded. On the other hand, the "lead-out area" is an area for notifying the playback device of the end of playback, and no meaningful data is recorded. The "volume area" is an area where the digital data making up the application is stored.
The physical sector to which it belongs is managed as a logical block. The logical block is identified by a unit in which the physical sector at the head of the data recording area is numbered 0 and consecutive physical sectors are given serial numbers. 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 ... Attached to many logical blocks in the 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 accordance with ISO13346, the volume management area
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 shows the correspondence between each file name of a plurality of files and the address of the logical block group occupied by each file, and the disk playback device uses this file system management information as a clue. To realize disk access in file units. That is, when a file name is given, all the logical block groups occupied by the file are calculated by referring to all the system management information, and these logical block groups are accessed to take out only desired digital data.

FIG. 4 is an explanatory diagram of the file area. Figure 4
As shown in, the file area contains a video manager (Vi
deo Manager) and multiple video title sets (VideoTitle
tleSet) is stored. These consist of a plurality of continuous files, and the recording location is calculated by the above file system management information. The reason for such a continuous file is that the data size of moving image data is enormous, and if this is made into one file, the file size is 1 GB.
Because it will exceed.

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

Of the video title sets shown in FIG. 4, the 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 consisting of three titles, the individual titles being called <Waist Slim Course>, <Arm Shape-up Course> and <Total Fitness Course>.

The video manager stores information about 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.

[0028] The video title set stores a plurality of video objects (VOB: Video Objects) 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 movie,
It is digital audio, image data, and multimedia data by including management information of these.
Since this example is the interactive software "Aerobics", the individual VOBs # 1, 2, 3, 4, ... Shown in FIG.
・ ・ Each exercise shows rhythmically stepping, scenes of raising right and left legs, scenes of jumping, scenes of twisting right and left around the hip, leaning forward on the upper body This corresponds to a one-minute to two-minute long scene, such as a scene that appears.

The data structure of the "video object (VOB)" has a structure in which a plurality of VOB units (VOBU) are arranged in time series from the beginning. The VOB unit (VOBU) is reproduction data of about 0.5 seconds to about 1.0 seconds. As shown in the detailed structure of the arrow heads in FIG. 5, a management information pack, a moving picture pack, and audio packs A to C. , Sub-picture packs A to B, and pack data of plural types. The pack data each have a data size of 2 KBytes, and by collecting and reintegrating the pack data for each type, the pack data becomes a digital data string forming moving image data, audio data, sub-picture data, and control information, respectively. Further, the digital data string re-integrated for each type may be referred to as an elementary stream, and the VOB may be referred to as a program stream composed of a plurality of elementary streams or a system stream.

In order to make the explanation easy to understand, the pack data of all VOB units are arranged in a regular manner in FIGS. 5 and 6, but the reproducing apparatus is arranged except that the management information pack is arranged at the head. Since it is buffered and taken out by, it is not necessary to be placed adjacent to each other for each type, but in practice they are placed in a mixed manner. Also, the total number of packs belonging to the VOB unit and the number of packs for each type do not have to be the same because the moving image, audio, and sub-picture include compressed data of variable length, and the number of packs actually differs for each VOB unit. . Also, although there are two moving picture packs in the VOB unit, the transfer rate assigned to the moving picture to the playback device is about 4.5 Mbit, and if it is a normal moving picture that is not actually a still picture, It will include hundreds of video packs.

The moving picture pack stored in the video object (VOB) is composed of at least one GOP by the digital data of the moving picture pack belonging to one VOB unit.
Digital moving image data called (GroupOfPicture) is formed. The GOP (Group Of Picture) here is one unit when decompressing compressed digital moving image data, and is image data for about 12 to 15 frames. still,
Regarding GOP, MPEG2 (Moving Picture Expert)
Group, ISO11172, ISO13818).

The relationship between each pack in the video object (VOB) and one scene of the moving image is shown in FIG. In the figure, the video material of one moving image is shown by a horizontally long rectangle and is arranged above the VOB. In addition, three-channel audio material is indicated by three horizontally long rectangles and is arranged below the VOB. Furthermore, the two-channel sub-picture material is shown by two horizontally long rectangles and is arranged below the audio material. The downward arrows extending from the moving image material indicate how the moving image material is recorded in the data field of each pack.

By following these downward arrows, the moving picture from the beginning of one scene to the 0.5 second is a 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 recorded 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 following description will be continued assuming that they are stored in two packs). Movies from 0.5 seconds to 1.0 seconds are also encoded in the data fields of the video packs 3 and 4 in the VOB unit 2 after being encoded into I picture, P picture and B picture. Although not shown, from 1.0 second
The video for up to 1.5 seconds is also encoded and then recorded in the data field of the video pack in the next VOB unit.

3 of one scene of interactive software
The relationship between the dubbed voice of the channel and the data field of the audio pack will be described with reference to FIG. Similar to the video pack, the arrow extending from the audio material in Fig. 6 to the VOB audio pack is that the audio data of 3 channels is encoded by the above 2 system and recorded in the data field of each audio pack in 0.5 second units. Is shown. That is, the dubbing sound 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 dubbing sound from 0.5 seconds to 1.0 second is recorded in the VOB unit 2. Recorded in the data field of Audio Pack A-2. Although not shown, the voice from 1.0 second to 1.5 seconds from the beginning is recorded in the data field of the audio pack A-3 in the next VOB unit. As described above, since the synchronization timing of the moving image of the audio is obtained by the PTS, it is not necessary for the same VOB unit to include the audio data that completely matches the moving image data included in the VOB unit. It may also be stored in the previous VOB unit.

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

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

The 3-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, an audio dubbing voice of English is set to the audio data A, a dubbing voice of French is set to the audio data B, and a dubbing voice of Japanese is set to the audio data C, so that the operator can switch between them. .

In the example of FIG. 6, since the sub-picture packs A and B in the VOB unit exist, it is possible to record the 2-channel subtitles in a distributed manner 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 on the sub-picture data A and displaying subtitles in French on 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 a transfer rate required during the reproduction of the VOB unit and a transfer required for each moving image stream, audio stream, and sub-picture stream. Stores the rate and buffer size specifications. General functions of management information pack and sub-picture pack As above,
In the interactive part of the interactive software, the sub-picture pack and the management information pack have an organic relationship. This is relevant when the sub-picture pack renders a menu containing several items. In this way, when the sub-picture pack draws a menu, the management information pack that belongs to the same VOB unit as the sub-picture pack has highlight information for performing playback control according to the cursor operation for the menu and the confirmation operation for the item. It has called information inside it. A typical example of the "reproduction control according to the finalizing operation" in the present embodiment is a branch of the reproduction path for switching from the current reproduction path to another reproduction path. In this "replay path switching", 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 by the disc playback device. It is done by doing. As described above, by selectively executing the command associated with the item in accordance with the confirming operation, 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 completed above, and then the configuration of the video title set management information of the video title set will be described. (1.1.1.2) Video title set management information The video title set management information stores information for managing a plurality of playback orders of the above-mentioned video object group. On a DVD, data that specifies the playback order of video object groups is called a program chain (PGC). That is, in the case of the video title set storing "Aerobics" of this example, the video title set management information shows how the scene should be developed when the waist slim course and the arm around shape up course are selected. A plurality of program chains (PGC) that define the above will be 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"
It is header information of the video title set management information, and stores a pointer to the storage position of the video title set section title search pointer table and the PGC management information table.

The "video title set section 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 the storage position of the program chain that is executed first for each title. Is specified. In this example,
Become an entry with each of the waist slim course and arm shape-up course in "Aerobics"
Stored in association with PGC information.

The "PGC management information table" has a reference numeral a.
As shown in 6, multiple PGC information 1,2,3,4 for all video objects stored in the video title set.
...... Stores n. Each PGC information is information that defines which VOB is to be read out in what reproduction order via the optical pickup. "Which VOB to read?"
Is defined in the “VOB position information table” indicated by reference numeral a7, and “what playback order is to be read” is the reference numeral.
It is defined by the "PG playback mode" shown in a9.

The "VOB position information table" is composed of a list of VOB position information. The internal structure of the VOB position information is shown on the side of FIG. As shown in the figure, the VOB position information is information including a VOB playback time, an offset to the VOB, and the number of VOB blocks. When reading the VOB, the disc 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 these VOB position information as clues, and is indicated by the "number of blocks". The logical blocks on the track are scanned in the forward direction by the number.

The "PG reproduction mode" defines whether each VOB in which the VOB position information is described in the "VOB position information table" is read out by normal reproduction or by random reproduction / shuffle reproduction. The difference between normal play and random play / shuffle play is that the VOB of VOB position information is read in the order of the “VOB position information table” in normal play, whereas the VOB position information is read in random play / shuffle play. This is the point at which the VOBs are read out at random.

The difference between the random reproduction and the shuffle reproduction is that the combination in the random reproduction includes the duplicate reading of the VOB, whereas the combination in the shuffle reproduction does not include the duplicate reading of the VOB. In other words, in shuffle play, a VOB that has been played once is never played again during shuffle play. In random reproduction, the same VOB can be reproduced redundantly.

More specifically, the VOB position information of the PGC information is "VOB # 5, VOB # 1, 2, 3, 4, 5".
The location information table ”is described. This PG
It is assumed that the PG reproduction pattern of C information is set to shuffle reproduction for three times of repetition. Three VOBs are reproduced from these five VOBs 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 the “VOB position information table” of five VOBs 7, 8, 9, and 10 is described. It is assumed that the PG reproduction pattern of this PGC information is set to three times of repetition and random reproduction. From these 5 VOBs, 3 VOBs are played, allowing duplication. In this case, for example, VOBs are read in the order of VOB # 5, 5, 3 or VOB # 2, 3, 3.

The data structure of the PG reproduction mode is shown in FIG. The PG playback mode has a length of 8 bits, of which the upper 1 bit is called the first field `and the lower 7 bits are called the second field`. A numerical 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 play. A numerical value of 1 or more is set in the second field, and if field 1 is 1, the program chain is set to shuffle play. The second field specifies the number of repetitions of random reproduction / shuffle reproduction. Since the second field is 7 bits long, the number of repetitions can be set within the range of 1-127. If the second field is 0, the VOB described in the VOB position information table is normally reproduced.

The data structure of each PGC information shown in FIG. 7 is as described above. Next, how the description contents of the VOB and PGC information of the video title set shown in FIG. 7 differ will be described in comparison with reference to FIGS. 9 and 10. 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 image of a rhythmically stepped image as moving image data, and VOB # 2 includes a live-action image of a right leg and a left leg raised. It can be seen that it is included as moving image data. VOB # 3 contains, as moving image data, a live-action image of the instructor horizontally extending and rotating his arms, and VOB # 4 contains a live-action image of the instructor jumping. It is understood that it is included as. As described above, in the VOB shown in FIG. 7, it can be seen that the two-minute and three-minute length videos of the instructor performing various exercises are recorded as individual VOBs.

FIG. 10 shows the correspondence between each course and the contents of PGC information in a table format. The horizontal row in this figure shows the "Course name", the "Program chain number" corresponding to the course, and the program chain number.
The contents of "VOB position information table" and "PG reproduction mode" of 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. "VOB" in this PGC information # 1
In the position information table, among the 30 VOBs, FIG.
The VOB # 3, VOB # 5, and VOB # 8 shown in (3) are designated as VOB position information of 15 VOBs related to the movement around the equilateral arm. Furthermore, "Shuffle designation" is designated as the PG playback mode. The number of repetitions in this shuffle reproduction is set to "10". In this way, the PG reproduction mode specifies that 15 VOBs should be shuffled.

In general, a combination n that takes r from n VOBs
Since Cr is represented by a calculation formula of nCr = n! / R! (Nr) !, the calculation of 15C10 = 15! / 10! · 5! Produces 3003 reproduction orders. That is, in a different order of 3003 times
VOB will be selected. In this figure, the entry program chain of "West Slim Course" is PGC
Information # 2. In the “VOB position information table” of this PGC information # 2, VOB # 6, VOB # 7, VO out of 30 VOBs
B # 9 12 legs of 12 VOBs related to hip and upper body exercise
VOB location information is specified. Furthermore, "Shuffle designation" is designated as the PG playback mode. The number of repetitions in this shuffle reproduction is set to "10". In this way, since the PG reproduction mode specifies shuffle reproduction of 10 VOBs, VOBs are selected by the reproduction pattern of the number of combinations 12C10.

In general, a combination n taking r from n VOBs
Since Cr is expressed by a calculation formula of nCr = n! / R! (Nr) !, the calculation of 12C10 = 12! / 10! · 2! Produces 66 reproduction orders. That is, the VOBs are selected in 66 different orders. In the figure, the title "Total Fitness Course" is associated with "PGC3". In addition, V in "VOB position information table" in PGC information 4
The number of OBs is 5, and "random designation" is designated as the PG playback mode. The number of repetitions in this random reproduction is set to "3". Since the PG reproduction mode specifies that 5 VOBs are randomly reproduced in this way, VOBs are selected with a reproduction pattern of the number of overlapping combinations 5H3.

Here, the overlapping combination nHr is nHr = n, which allows the same one to be taken from n VOBs and takes r times.
+ r-1 Cr = (n + r-1)! / r! (n-1)! is calculated, so 5H3 = (5 + 3-1)! / 3! 4! The street playback order occurs. The total fitness course is
The number of VOBs and the number of repetitions are small, and the same VOB is selected many times, so even fat people and people who are not confident in reflexes can keep up with them. On the other hand, the "arm circumference shape up course" has a large number of VOBs and repeats,
In addition, the VOB selected changes rapidly, so a high level of reflexes and physical strength are required. This is also clear from the above calculation result, and is 20 times or more (3003 ways), compared with 126 ways for beginners. With such a huge number of VOB selections, it is possible to achieve aerobics that even advanced users will be satisfied with.

As described above, depending on the setting of the PG reproduction mode, the title creator can provide an aerobics curriculum of multiple stages such as advanced, intermediate, and beginner on a single optical disc. Digest 1 corresponds to PGC information # 4. The PGC information # 4 is a course for sequentially reproducing 15 from the beginning to the middle of the 30 VOBs, and the number of repetitions is set to 0. Since it is set to 0, the PGC information # 4 is a course for sequentially reproducing 15 from the beginning to the middle of the 30 VOBs in the digest edition 1. These are for those who just want to look at the aerobics exercise without doing the actual exercise.

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

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

FIG. 21 shows the data structure of the video manager. As shown in FIG. 21, the “video manager” is
"Video object for menu", "PGC for menu"
It is composed of a "management information table" and a "title search pointer table". As the name implies, the "menu video object" is a VOB specialized for volume menus. 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 for the menu. FIG. 22 is an explanatory diagram of a display image for the volume menu. The video object for the volume menu consists of multiple items y611, y612, y613, y61.
Having 6. These items are contents for identifying any one of the titles such as "aerobics <arm shape shaping course>" and "aerobics <waist slim course>". When the user performs a confirmation operation on such an item, the VO
Each video title set included in the management information pack existing in B and a command having each title as a branch destination are executed, and the title to be reproduced is specified.

The "menu PGC management information table" is
This is PGC information specialized for the volume menu, and the recording location of the menu VOB is described so that the menu VOB can be read out when the playback device is loaded. The PGC information is read by the reproducing device immediately after the optical disc is loaded in the reproducing device and the optical pickup moves from the volume management area to the volume area. This will bring up the volume menu on the screen.

The "title search pointer table" is
It is an index for specifying the title set to which each title belongs and the title number given to each title in the title set. (2.1) Overview of disc reproducing device An optical disc reproducing device (DVD player) will be described. FIG. 11 is a diagram showing appearances of the DVD player 1, the television monitor 2, and the remote controller 91.

The DVD player 1 has an opening in the front of the housing, and a drive mechanism for setting an optical disk is provided in the depth direction of the opening. A remote control receiver 92 having a light receiving element for receiving infrared rays emitted from the remote controller is provided on the front of the DVD player. When the operator operates the remote controller, the remote controller receiver 9
2 issues 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 surface of the DVD player, and by connecting an AV code to this terminal, the video signal reproduced from the DVD can be output to the large-sized television monitor 2 for home use. You can As a result, the operator can enjoy the playback image of the DVD on a large-sized television for home use such as 33 inches or 35 inches. As can be seen from the above description, the DV of the present embodiment
The D player 1 is not used by connecting to a personal computer or the like, but is used together with the television monitor 2 as a household electric appliance.

The remote controller 91 is provided with a spring-biased keypad on its housing surface, and outputs a code corresponding to the 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. This DVD player includes a drive mechanism 16, a mechanism control section 83, a signal processing section 84, A
It is composed of a V decoder section 85, a remote control receiving section 92, and a system control section 93. Furthermore, the AV decoder unit 85
The signal separating unit 86, the video decoder 87, the sub-picture decoder 88, the audio decoder 89, and the picture synthesizing unit 90 are included.

The drive mechanism 16 comprises a base for setting an optical disk and a spindle motor 81 for clamping and rotating the set optical disk. The base on which the optical disc is set is moved back and forth 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 section 83 controls a mechanism system including a motor 81 for driving the disc and an optical pickup for reading out signals recorded on the disc. Specifically, the mechanism control unit 83 adjusts the motor speed according to the track position instructed 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 the 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, error correction, etc. on the signal read from the optical pickup, converts it into a digital data string, and stores it in the system control section 93. The data is stored in a buffer memory (described later) in logical block units. The AV decoder unit 85 performs a predetermined process on the digital data that is an input VOB and converts it into a video signal or an audio signal.

The signal separating unit 86 receives a digital data string transferred from the buffer memory in logical block units, and sorts moving image 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 video data is output to the sub video decoder 88. The management information pack is output to the system control unit 93. At this time, the signal separating unit 86 is instructed by the system control unit 93 of the number.
This number corresponds to the audio data A, shown in the explanatory diagram of FIG.
One of B, C and sub-picture data A, B is designated, and 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 expands the moving image data input from the signal separation unit 86 and outputs it as a digital video signal to the image synthesis unit 90. If 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 it and outputs it to the picture composition section 90 in the same format as the video signal. To do.

The audio decoder 89 includes a signal separation unit 8
The audio data input from 6 is decoded, expanded and output as a digital audio signal. Video synthesizer 9
0 is the output of the video decoder 87 and the sub-picture decoder 88.
To output an NTSC signal in which the output of the above is mixed at a ratio instructed to the system control unit 93. (2.2.2) Components of Disc Playback Device-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 fetched in a buffer (not shown). On the other hand, in the case of VOB, the system controller 93 transfers the packs one by one to the signal separator 86. AV when transferred in this way
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 unit 86. The embedded processor 96 is configured by integrating a ROM storing a control program for the DVD player 1 in general, a working memory, and a CPU. The PGC information buffer 31 stores the currently selected PGC information.

The work buffer 97 is a system control unit 96.
Is a buffer used for expanding the one-dimensional array "random number list" and the variable "specified number of times" 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 this figure. When you press the eject button on the DVD player 1, the base moves to the outside of the housing. The operator mounts the optical disk with the base being moved outward. When mounted on a 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 waits for an optical disc to be inserted. When the loading of the optical disc is notified from the optical sensor or the like, the rotation of the disc 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 disk rotation left in the lead-in area is continued until the rotation operation becomes stable. When the rotation operation is stabilized, the optical pickup is moved from the lead-in area to the outer circumference to read the volume management area. The video manager is read based on the information in the volume management area (step 122). Furthermore, the system control unit 93 refers to the menu PGC management information table of the video manager, calculates the recording address of the program chain for the volume menu, reproduces it, and holds it in the PGC information buffer 31. If the program chain for the volume menu is held inside, the system control unit 93
By referring to the held PGC information, the video object (VOB) to be reproduced and the recording address on the optical disc are calculated. When the video object to be played back is determined, the system control unit 93 outputs a control signal to the mechanism control unit 83 and the signal processing unit 84 to take out the determined video object from the optical disc and play it back. As a result, the volume menu shown in FIG.
Will be displayed on the screen (step 123).

Looking at this list of titles, the operator considers his or her weight and considers which course is the most necessary, and the "aerobics <arms shape-up course>" is the most necessary. I decided it was. Then, it is assumed that the menu item of the course is selected and confirmed. The video manager stores a branch command and a title number as its parameter in association with the menu item, and this highlight command is executed by the system control unit 93 (step 125).

As the execution operation by the branch command, the system control unit 93 refers to the title search pointer table which is a part of the video manager to determine the video title set (VTS) and the title number in the VTS to which it belongs. When the video title set is confirmed, 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 confirmed title set, and reproduces the video title set management information. Video title set section title search pointer table which is a section is taken out internally (step 12).
6).

If the title search pointer table of the video title set section can be retrieved, the system control section 93
Refers to this to determine the PGC information of the program chain for starting the reproduction of the 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 holds it in the internal PGC information buffer 31. At this time, 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
Refers to the held PGC information to determine the video object to be played back and its recording address, and plays back the decided video object by outputting a control signal to the mechanism control unit 83 and the signal processing unit 84.

After that, the system control unit 93 holds the 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, which is a part of the PGC information, and determines the next PGC information. The system control unit 93, which has determined the next PGC information, discards the current PGC information, holds the next PGC information, and continues the reproduction progress according to this (step 128).

Incidentally, supplementing the reproduction of the video object, the DVD player 1 is accompanied by a switch key for switching between the audio channel and the sub-picture channel, which is not shown. Then, the audio channel and the sub-picture channel selected by the user with this switching key are held in the system register (not shown) of the system control unit 93. When the video object is played back, the system control unit 93 refers to an internal system register to specify a valid channel,
The control signal is output to the AV decoder unit 85. As a result, only the valid audio channel and sub-picture channel information is output to the outside together with the moving picture information.

(2.3.2.2) First operation example: playback 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 (b) will be described.
Now, "Aerobics <Shape-up course around the arm>"
Is selected, the PGC information buffer 31 stores 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
1 to the program chain, the playback order is determined according to the description content of the PG playback mode.
This is realized by multiple branching shown in the flowchart of No. 5. In step 140, the PG reproduction mode is read from the PGC information. In this step, the PG reproduction mode instructed in this figure is read. After reading the PG reproduction mode, the process proceeds to step 141. In step 141, read
The bit pattern of the second field in PG playback mode is "00.
0 0000 ”is determined. PGC information # 1 in FIG.
In the second field of "repetition number 10 times", that is, "000 101
Since "0" is described, the process proceeds 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 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. Further, the "total number n" is the number of VOB position information described in the VOB position information table, and in the case of PGC information # 1, it is "15" as described above. The “specified number of times k” is a variable for storing the number of times of loop processing of the loop processing including steps 152 to 159.

When the flow shifts to step 144 in the flow chart of FIG. 15, step 150 in the flow chart 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 has a 7-bit length, the number of repetitions in the range of 0 to 127 is designated. After execution of step 150, step 15
Move to 1. In step 151, the random number list is cleared to all 0s. After execution of step 151, the process moves to step 152, and a random number (0 <r <n + 1) in the integer range from 1 to 15 VOBs is generated. Here, it is assumed that the integer 3 has occurred. In this embodiment, since the VOBs described in the “VOB position information table” are uniformly selected, uniform random numbers are generated. Besides, random numbers having an arbitrary distribution such as Gaussian random numbers may be used. Weighting may be performed so that exercises in the second 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 included in the random number list or not.
Since the PGC information has not been described since it has just been selected, the process proceeds to step 154. In step 154, the VOB position information arranged third in the "VOB position information table" is read. In step 155, it is calculated which part of the spiral track on the disk the logical block to be read occupies based on the VOB offset described in the "VOB position information". 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, the mechanism control unit 83 is instructed 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 process of step 157 is the optical pickup of the 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, the 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, a live-action image of the instructor horizontally extending and rotating both arms as shown in FIG. 18 is displayed on the screen of the television monitor for about several minutes. During this time, a light BGM is flowing from the speaker, and the operator performs the same exercise as the movement of the instructor on the screen in accordance with 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 integer value 3 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 decremented by 1. In step 159, it is determined whether the specified number of times k is 0 or more. Since it is 0 or more in the first round, the process moves to step 152 to generate a random number.

At step 152, a random number (0 <r <n + 1) in the integer range from 1 to the total number VOB is generated. Here, it is assumed that the integer value 3 has occurred. After executing step 152,
Control goes to step 153. In step 153, it is determined whether the generated numerical value 3 is included 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 regenerate a random number.
If the regenerated random number is also listed, repeat step 1
Returning to 52, a random number is regenerated.

While the random numbers described in the list are generated in this way, the repetition of steps 152 to 153 is continued. By collating the histories described in the random number list in this way, it is possible to avoid duplicate selection of already selected VOBs. It is assumed that the integer value 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. 5 in step 155
Based on the VOB offset described in the th VOB position information, which track on the disk the logical block to be read next corresponds is calculated. 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, the mechanism control unit 83 is instructed to perform block read control.

In steps 156 and 157,
The data recorded in the logical block #k is read out 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. This allows the screen of the TV monitor to
A live-action image in which an instructor as shown in FIG. 19 horizontally extends and swings the arm and crosses it in front of the abdomen is displayed for about several minutes. During this time, a different light BGM is playing again from the speaker, and the operator performs the same exercise as the movement of the instructor on the screen in accordance with the rhythm of the BGM.

When the above process is repeated for all the logical blocks described in the "VOB position information" of VOB # 3, the process proceeds to step 158 and the integer value 5 is added to the random number list. With this addition, "3" is added to 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 decremented by 1. Step 1
At 59, it is determined whether the designated number k is 0 or more. In the second round, the process proceeds to step 152 to generate a random number.

In step 152, a random number (0 <r <n + 1) in the integer range from 1 to the total number VOB is generated. Here, it is assumed that the integer value 8 has occurred. After executing step 152,
Control goes to step 153. In step 153, it is determined whether the generated numerical value 8 is included 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, which track on the disk the logical block to be read next corresponds is calculated based on the VOB offset described in the "VOB position information". 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, the mechanism control unit 83 is instructed to perform block read control.

In steps 156 and 157,
The data recorded in the logical block #k is read out 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 the VOB is sequentially read. The read data is separated and reproduced by the AV decoder unit 85. The video separated at this point is displayed on the television screen of FIG. 24, and audio output by audio data is started. As a result, on the screen of the TV monitor, as shown in FIG. 20, the instructor extends his arms and swings his back to the chest level, and the live-action image of his arm raised to the front is about. Displayed for a few minutes. During this time, a different light BGM is playing again from the speaker, and the operator performs the same exercise as the movement of the instructor on the screen in accordance with 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 decremented by 1. In step 159, it is determined whether the specified number of times k is 0 or more. Step 1 in the third round
The process proceeds to 52 to generate a random number.

Every time when it is determined in step 153 that an item is not described, the processes of steps 152 to 159 are repeated. Each time this cycle is completed, the count value is decremented by 1 in step 159, and the process proceeds to step 160.
By repeating step 159, the count value decrements by one and approaches the lower limit 0. When the count value reaches the lower limit 0, step 160 becomes Yes and this flow chart is ended. During this repetition, the instructor's exercise changed rapidly and BG
Since M also changed rhythmically, the operator was able to sweat well in a short time.

If the same optical disc loading and course selection are performed the next morning, the VOBs will appear in a completely different order from yesterday.
Is played. In this way, the reproduction order changes rapidly, so that the effect of the exercise appears to the operator. <Random playback> Since random playback is a combination in which duplication may exist, the flow of FIG.
Collation with the random number list in the chart may be cut. FIG. 17 shows a flow chart of the system control unit 93 at the time of random reproduction configured as described above. FIG. 17
As is clear from the above, in the shuffle reproduction, step 150 of reading the specified number of times k from the bit pattern of the second field and storing it in the counter, step 152 of generating a random number r in the integer range from 1 to the total number n, “VOB position” Step 154 of reading the r-th position information No. r arranged in the “information table”, the mechanism control unit 83 indicates that the optical pickup is moved to the logical block at the recording start position of the VOB described in the VOB position information table. 155, step 156 of repeating the number of blocks described in the “number of blocks” of the VOB position information, and a step of reading the data recorded in the logical block #k through the optical pickup and the signal processing unit. 157, Step 158 of subtracting the designated number k by 1, determination is made whether the designated number k is greater than 0 Step 159 are sequentially performed that.

<Normal reproduction> In normal reproduction, VOBs are only read out as described in the "VOB position information table". For implementation, only the procedure of steps 156 to 157 in the flowchart of FIG. 15 need be performed. If you then select "Waist Slim Course," a live-action image of rhythmically stepping, raising your right and left legs, and an instructor jumping will appear on the screen. That is, "arm circumference shape up course"
When the PGC information corresponding to is read into the disc playback device, the movement around the arm is randomly selected and displayed on the screen.
When the PGC information corresponding to "West Slim Course" is read into the disc playback device, exercises around the waist are randomly selected and displayed on the screen.

As described above, according to the present embodiment, the PGC information corresponds to each of the courses such as the "waist slim course" and the "arm around shape up course".
One PGC information specifies the playback order by the "VOB position information table" and the PG playback pattern so that the exercises around the arm are randomly selected and played, and the other PGC information specifies the exercise around the waist randomly. Since the playback order is specified to be selected and played back, when selecting each course, only the video related to the course is randomly played. Due to such random reproduction, the order of the above-described movements around the arm and around the waist changes rapidly every morning when the course of the optical disc is selected. As a result, the operator's impression of courses such as "Waist Slim Course" and "Arm Shape-up Course" will be refreshed forever.
You can drive aerobics every morning with a fresh feeling.

In the present embodiment, one VOB unit is composed of one GOP, but it is not limited to one GOP as long as the moving picture image to be stored has a reproduction time of about 1 second. It goes without saying that it may be composed of three GOPs having a very short reproduction time. Further, in this case, the management information pack is arranged at the head of a plurality of consecutive GOPs and stores the effective reproduction control information for the plurality of GOPs.

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

Further, in the present embodiment, the management information pack is arranged for each GOP which is a moving image restoration unit. However, if the compression method of the digital moving image is different, it is obvious that it is set for each restoration unit of the compression method. . Finally, a method of manufacturing the optical disc according to this embodiment will be briefly described. The master prepares a number of videotapes taken with a video camera and a music tape recorded live, and the video and audio recorded in these are digitized and uploaded to a nonlinear editing device. The editor creates menus and items by an application program such as a graphic editor while reproducing video and audio in units of frames on the non-linear editing device. Along with this, a management information pack incorporating a highlight command is also created using a GUI generator or the like. After the creation, these are encoded according to the MPEG standard to generate moving image data, audio data, sub-picture data, and management information pack. Once created, VOB units are created from these on the non-linear editing device, and VOBs are created. When VOB is created, VOB number is added to VOB, and PGC information # 1, # 2, # 3, # 4 ... # n, video title set section title search pointer table, video title set management information And construct the above-mentioned data structure in the memory of the workstation.

After constructing the data structure, these data are converted into logical data strings 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, lead-in area data, lead-out area data, etc. to the volume data. The master cutting using this physical data string creates a master of the optical disc. Further, an optical disc is manufactured from the master made by the press machine.

In the above manufacturing flow, the existing manufacturing equipment for CDs 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 Ohmsha's "Compact Disc Reader" by Heitaro Nakajima and Hiroshi Ogawa, and Asakura Shoten, "Optical Disc System", The Japan Society of Applied Physics, Optics Symposium.

[0100]

As described above, according to the present invention, a plurality of video streams are recorded.
Object and multiple playback code for multiple video objects
Menu information and multiple chain information that define
A recording method for recording on a recording medium, where each chain information
Includes table information and flag information for each playback course.
Chain information about the playback order of the video objects that appear
Video belonging to the playback course, which is shown in the table information for each
Objects according to the playback order in the table information
To play sequentially (1), or a video belonging to a playback course
Whether to randomly select and play objects n times
(2) is indicated in the flag information for each chain information, and each reproduction is performed.
Menu information that accepts menus for selecting courses
, Multiple video objects and multiple chains
Record information and menu information on a recording medium
The flag information includes reproduction count information, and
When the live count information is set to the value "0", it is played back.
Video information that belongs to the course in the table information
Indicates that the playback is to be performed sequentially according to the playback order
(1), the playback course is set by setting the value to "n"
Randomly select video objects belonging to n times
This means that the effect (2) is produced. INDUSTRIAL APPLICABILITY The recording medium according to the present invention is useful for keeping the freshness of video contents and preventing obsolescence, and is useful for further developing the market for teaching material type interactive software.

[Brief description of drawings]

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

FIG. 2A is an explanatory diagram of track arrangement of an information layer of an optical disc. (B) It is explanatory drawing of the physical sector of the information layer of an optical disk.

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 subtitle 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, in a tabular format, the content of a real video image of moving image data of each VOB.

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

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

FIG. 12 is a block diagram showing an internal configuration of the DVD player 1 in the present embodiment.

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

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

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

FIG. 16 is a flowchart showing a procedure for shuffle reproduction by the system controller 93.

FIG. 17 is a flowchart showing a procedure for random reproduction by the system controller 93.

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

FIG. 19 is an explanatory diagram showing the display content of the television monitor when VOB # 5 is being read.

FIG. 20 is an explanatory diagram showing display contents on the 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 showing an example of a volume menu.

[Explanation of symbols]

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 processor 85 AV decoder section 86 signal separator 87 video decoder 88 Sub Video Decoder 89 audio decoder 90 Video synthesizer 91 remote control 92 Remote control receiver 93 System control unit 94 buffer memory 95 Management information pack buffer 96 System control unit 96 processors 97 working buffer 107 DVD 108 transparent substrate 109 Information layer 110 Adhesive layer 111 transparent substrate 112 printing layers 113 light beam 114 light spots

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kaoru Murase Kaoru Murase 367 Ikaruga-cho, Ikoma-gun, Nara Pref. 105 Kurihara No. 105 (72) Inventor Katsuhiko Miwa 2-402, Yakumonishicho, Moriguchi-shi, Osaka (56) ) Reference JP-A-6-309841 (JP, A) JP-A-7-147661 (JP, A) Patent 2804630 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 5 / 85-5/956 G11B 27/00

Claims (3)

(57) [Claims] 1. A plurality of video objects and a plurality of video objects
Multiple chains that define multiple playback courses for an object.
A record for recording the menu information and the menu information on a recording medium.
A method, in which each chain information includes table information and flag information, and a reproduction order of video objects that appear in each reproduction course.
Is displayed in the table information for each chain information, and the video objects belonging to the playback course are
Is it played back sequentially according to the playback order in the information (1),
Random video objects belonging to the playback course n times
Whether to select and play (2) flag for each chain information
A menu that allows you to select operations for each playback course
-As shown in the information, multiple video objects, multiple chain information,
The menu information is recorded on a recording medium, and the flag information includes reproduction number information.
The information belongs to the reproduction course by being set to the value "0".
Play order of video objects in table information
Indicates that the playback is to be sequentially performed according to (1), and the value is set to "n" to belong to the playback course.
Randomly select and play video object n times
A recording method characterized by showing the effect (2) . 2. Multiple video objects and multiple video
Multiple chains that define multiple playback courses for an object.
The recording medium on which the menu information and the menu information are recorded.
It is a playback device, Each chain information is Including table information and flag information, The table information is The playback order of the video objects that appear in each playback course
Indicates The flag information includes reproduction count information, and the reproduction count information.
The report indicates a value from 0 to n (n is an integer of 1 or more), The menu information is Draw a menu that accepts selection operations for each playback course.
Information, The playback device is Reading means for reading the menu information from the recording medium, A reproducing means for reproducing the read menu information, Specify one of the multiple playback courses shown in the menu information
The operation to be performed is accepted from the user and multiple chain information is received.
Of the chain information corresponding to the playback course
Acceptance means, The number of playback times information in the specified chain information is a value
If it is “0”, the video audio that appears in the specified playback course will be displayed.
Add the object to the table information in the chain information.
Read-out means in the order of reproduction
Execute control (1) to play The number of playback times information in the specified chain information is a value
If it is "n", it should be in the table information in the chain information.
The video object n times regardless of the playback order.
Select it to the read-out means and read it to the playback means.
A control means for executing the control (2) To have
Playback device characterized by. 3. Multiple video objects and multiple video
Multiple chains that define multiple playback courses for an object.
The recording medium on which the menu information and the menu information are recorded.
It's a playback method, Each chain information is Including table information and flag information, The table information is The playback order of the video objects that appear in each playback course
Indicates The flag information includes reproduction count information, and the reproduction count information.
The information is Indicates a value from 0 to n (n is an integer of 1 or more), Menu information is Draw a menu that accepts selection operations for each playback course.
Information, The reproduction method is A reading step of reading the menu information from the recording medium, A reproduction step for reproducing the read menu information, Specify one of the multiple playback courses shown in the menu information
The operation to be performed is accepted from the user and multiple chain information is received.
Of the chain information corresponding to the playback course
Acceptance step to The number of playback times information in the specified chain information is a value
If it is “0”, the video audio that appears in the specified playback course will be displayed.
Add the object to the table information in the chain information.
Playback is performed by sequentially reading the reading steps in the playback order.
Execute control (1) to make the step play, The number of playback times information in the specified chain information is a value
If it is "n", it should be in the table information in the chain information.
The video object n times regardless of the playback order.
Select it as the default and have it read by the read step,
Control step to execute control (2) to replay
A reproducing method comprising: