JP2000156022A - Disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk reproducing device trying again branching selection with simple operation and in a short time. SOLUTION: A system controller 60 stores the contents of program chain information PGCI answering to a branching selection picture in a RAM 62 when the branching selection picture of a story is displayed, and a next story is selected. When a reselect key of an operation part 58 is depressed by a user, and trying again of story selection is instructed, the system controller 60 reads out the contents of the PGCI stored in the RM 62 just before, and processes the answering PGC, and tries again reproducing operation from just before story branch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk reproducing apparatus for reproducing digital versatile disks (DVDs).

[0002]

2. Description of the Related Art Recently, DVDs have been used as disc-type recording media.
Is attracting attention. This DVD has a diameter of 12 cm and a thickness of 1.2 mm, and has the same shape as a CD (compact disk), but has a storage capacity of 4.7 GB in a single layer and 8.5 GB in a two layer by increasing the recording density. Has been realized.

In addition, various kinds of data are mixedly stored in a DVD by adopting a moving picture data compression technique and an audio data compression technique by MPEG2. Considering the case of recording a movie on a DVD, video data and audio data are usually stored. For example, by storing subtitle data in a plurality of languages in addition to these,
Captions in the language selected by the user can be displayed. In addition, by storing still image data such as profiles of movie directors and performers, it becomes possible to display these contents by user operations. further,
A function (multi-angle function) that allows the user to select the direction in which the subject is viewed during playback by storing image data obtained by shooting the subject from multiple directions, and image data and audio corresponding to multiple stories By storing data, it is also possible to realize a function (multi-story function) that can change the story development according to the user's selection. The DVD reproducing device performs a reproducing operation of a DVD storing such various data.

[0004]

However, when the multi-story function is realized by using the conventional DVD reproducing apparatus, the operability is not always good. FIG. 10 is a diagram showing an outline of story branching in a conventional DVD reproducing apparatus.

[0005] For example, when the story A that has been reproduced until then branches, a branch selection screen 1 is displayed, and either the story B or the story C is selected in accordance with a user's instruction. Here, when story B is selected, story B is progressing, branch selection screen 2 is displayed, and either story D or story E is selected in accordance with a user's instruction. Here, when the story D is selected, the story D is progressing and the branch selection screen 3 is reproduced, and one of the story F and the story G is selected according to a user's instruction.

Here, considering a case where a skip operation in the reverse direction is performed when the story F is selected and the content is progressing, in a conventional DVD reproducing apparatus, the maximum number of windings is only up to the beginning of the story F. I couldn't go back. Therefore, even when the user wants to re-select the story, for example, the selection screens 1 to 3 cannot be directly displayed. In such a case, if it is necessary to display any of the selection screens 1 to 3 and reproduce the story contents other than the story F,
It is necessary to restart the reproduction operation from the beginning, and there is a problem that the operation of the user becomes complicated and the operation takes time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a disk reproducing apparatus capable of performing branch selection again with a simple operation in a short time. is there.

[0008]

In order to solve the above-mentioned problems, a disk reproducing apparatus of the present invention displays a branch selection screen for instructing a branch selection of a story when a story at a branch destination is selected. The branch information necessary for returning to the display of the branch selection screen and repeating the reproduction operation is stored in the branch information storage means, and when the user instructs to re-select the story branch, this branch information is stored. Is read out, the display returns to the display of the branch selection screen specified by the branch information, and the reproduction operation is repeated. Therefore, the user can repeat the reproduction operation from the branch selection of the story only by performing a simple operation. Also,
If the operation by the user is simplified, the time required for the operation is shortened accordingly.

In particular, the branch information corresponding to each of the plurality of branch selection screens displayed in order as the story progresses is stored in the branch information storage means in the display order of the branch selection screen, and the branch selection of the story is performed. It is desirable to read the branch information stored in the branch information storage unit immediately before the redo instruction is issued. By reading the last stored branch information, it is possible to return to the previously displayed branch selection screen and repeat the reproduction process. Therefore, by reading out the branch information in the order in which it was stored immediately before, the branch selection screen can be displayed in order from the one displayed immediately before, and the story that has branched out can be traced back.

It is desirable to use program chain information corresponding to a branch selection screen as the above-mentioned branch information. Considering various types of data recorded on a DVD, a story such as a movie to be reproduced is configured in units of a program chain, and information on the connection of the program chains and a branch selection screen is included in the program chain information. Therefore, by storing this as branch information, it is easy to redo the branch selection of the previous story.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a DVD reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

(1) Contents of Data Recorded on DVD First, details of data recorded on a DVD as a disk-type recording medium will be described. FIG. 1 is a diagram showing a structure of a volume space of a DVD. As shown in the figure,
The volume space of a DVD has a volume / file structure, DVD-Video from the inner circumference to the outer circumference of the DVD.
o zone and DVD other zone. Among these, the DVD-Video zone contains various data necessary for the reproducing operation. D
The VD-Video zone is a video manager (VM
G) and a plurality of video title sets (VTS) corresponding to each title.

FIG. 2 is a diagram showing a data structure of the VMG. As shown in the figure, the VMG is composed of video manager information (VMGI), a video object set for VMG menu (VMGM_VOBS), and a VMGI backup file (VMGI_BUP).

[0014] The VMGI includes information on VTS (for example, the number of VTS, identification information of each VTS, each VTS in the DVD).
Of the title displayed in the title menu, a plurality of program chain information (PGC
I) and the like. VMGM_VOBS is composed of a plurality of video objects (VOBs). This VOB includes video data that is playback data when a menu screen (title menu) for selecting a title is played.

FIG. 3 is a diagram showing the data structure of the VTS. As shown in the figure, VTS includes video title set information (VTSI), VTS menu video object set (VTSM_VOBS), VTS title video object set (VTSTT_VOBS),
VTSI backup file (VTSI_BU
P).

VTSI is V for identifying a title.
Information on titles such as TS_ID, multiple PGCIs
Etc. are included. VTSM_VOBS and VTST
T_VOBS is composed of a plurality of VOBs. This VOB includes reproduction data such as video data and audio data.

A program chain (PGC), which is a logical processing unit in the reproduction operation, is composed of program chain information (PGCI) and one or a plurality of video objects (VOB). For example, a PGC is constituted by one PGCI in the VMGI and one or a plurality of VOBs in the VMGM_VOBS. Also, VT
A PGC is constituted by one PGCI in the SI and one or a plurality of VOBs in the VTSM_VOBS. Alternatively, one PGCI in VTSI and VTSTT_VO
A PGC is constituted by one or a plurality of VOBs in the BS.

PGCI and VMGM_VOB in VMGI
PG composed of one or more VOBs in S
C displays the title menu, and when any item in this title menu is selected,
This is for specifying the reproduction position of the corresponding data. Also, PGCI and VTSTT_VOB in VTSI
PG composed of one or more VOBs in S
C is for reproducing the corresponding content when any item in the title menu is selected. Further, the PGCI makes it possible to reproduce the story selected by the user from the branch selection screen in the multi-story reproduction operation and the story displayed on the branch selection screen.

FIG. 4 is a diagram showing an example of the structure of the PGC. The PGCI in the VMGI and the 1 in the VMGM_VOBS are shown.
Alternatively, the structure of a PGC constituted by a plurality of VOBs is shown. As shown in FIG.
1 is PGCI # 1 in VMGI and VMGM_VOBS
VOBs # 1 to # 3. Also,
PGC # 2 is composed of PGCI # 2 in VMGI and VMGM_
It is composed of VOBs # 4 and # 5 in the VOBS. These PGCs are specified by PGC numbers. The PGC number is determined according to the storage order of the PGCI in the VMGI. For example, the PGC shown in FIG.
In the above, since PGCs are stored in the VMG in the order of PGCI # 1 and PGCI # 2, the PGC number of PGC # 1 including PGCI # 1 is “1”, and PGC
The PGC number of PGC # 2 including I # 2 is “2”.

Note that PGCI and VTSM_ in the VTSI
PGC composed of one or a plurality of VOBs in VOBS, PGCI in VTSI and VTSTT_VO
P composed of one or more VOBs in the BS
The GC also has the same structure as the PGC shown in FIG. The PGCI includes a reproduction order of a plurality of corresponding VOBs, information on a PGC to be reproduced next, and the like.

FIG. 5 is a diagram showing the correspondence between the program chain (PGC) processed in the multi-story reproduction operation and the story and branch selection screen. As shown in the figure, one PGC is used for performing a reproduction operation of one story and a branch selection screen displayed subsequent to the story. For example, PGC # 1 is story A
And the various data necessary for performing the reproduction of the content and displaying the branch selection screen 1. The PGC # 2 includes various data necessary for reproducing the contents of the story B and displaying the branch selection screen 2.

The PGCI constituting the PGC processed in the multi-story reproduction operation includes information on the VOB processed during the story reproduction, information on the VOB processed when displaying the branch selection screen, or information on the branch. Information about PGC for reproducing each story displayed on the selection screen is included.

FIG. 6 shows the above-mentioned VMGM_VOBS, V
V included in TSM_VOBS, VTSTT_VOBS
It is a figure showing the data structure of OB. As shown in the figure,
VOB is composed of a plurality of cells. Each cell includes a plurality of video object units (V
OBU). Each VOBU includes a navigation pack (NV_PCK), a video pack (V_PCK), and a sub-picture pack (SP_PCK).
And at least one of audio packs (A_PCK)
It is comprised including one.

NV_PCK contains reproduction control information (PC
I) and data search information (DSI). In the PCI and the DSI, the position of the VOBU to be reproduced next, the data amount of the VOBU, and the like are set. V_P
CK, SP_PCK, and A_PCK are a pack header and a packet header each containing information such as the type of reproduction data (moving image, sub-picture, audio), and video data, sub-picture data, and audio data (compressed data). Playback data).

(2) Overall Configuration of DVD Playback Apparatus FIG. 7 is a diagram showing an overall configuration of a DVD playback apparatus according to one embodiment to which the present invention is applied. The DVD reproducing apparatus 100 shown in FIG. 1 includes a spindle motor 12, an optical pickup 14, a feed motor 16, and a servo control unit 18 for reading signals recorded on the DVD 10, and an RF amplifier for amplifying the read signals. 22, digital signal processor 24, four buffer RAMs 26, 34, 38, 4
2, stream separation unit 30, audio decoder 32,
A video decoder 36, a sub-picture decoder 40, a video processor 44, a video encoder 46, a digital-to-analog (D / A) converter 48, an operation unit 58 for a user to input various instructions, and the DVD playback device 1.
00 and a system controller 60 that controls the entire system.

The spindle motor 12 rotates the DVD 10 at a constant linear speed. The optical pickup 14 is a DV
It detects data recorded in D10, and includes, for example, a semiconductor laser and a photodiode.
The feed motor 16 moves the optical pickup 14 in the radial direction of the DVD 10.

The servo controller 18 drives the spindle motor 12 and the feed motor 16 described above.
By moving an objective lens (not shown) built in the optical pickup 14, the focal position of the semiconductor laser is set to DV.
It is moved vertically and horizontally with respect to the recording surface of D10. In addition, the servo control unit 18 performs various servo (focus servo, tracking servo, and rotation servo) controls necessary for reading data from the DVD 10.

The RF amplifier 22 amplifies an electric signal output from a photodiode built in the optical pickup 14. When a large jump or shock is applied to the DVD reproducing apparatus 100 to cause a track jump, the track jump occurs. It also has a function of outputting a detection signal.

The digital signal processing unit 24 includes the RF amplifier 2
2 is converted into digital data and then subjected to signal demodulation processing (8-16 demodulation processing) and error correction processing in accordance with the data format of the DVD 10,
It is stored in the RAM 26. And the digital signal processing unit 2
4 is an RA in response to an instruction from the system controller 60.
The VOBU included in the data stored in M26 is extracted and output to the stream separation unit 30.

The stream separation unit 30 analyzes the pack headers constituting the VOBU output from the digital signal processing unit 24 according to the instruction of the system controller 60, and thereby, the audio pack (A_PCK) and the video pack (V_PCK). , Sub-picture pack (SP_
PCK) and the navigation pack (NV_PCK). The audio pack separated by the stream separation unit 30 is output to the audio decoder 32, the video pack is output to the video decoder 36, the sub-picture pack is output to the sub-picture decoder 40, and the navigation pack is transferred to the system controller 60. .

The audio decoder 32 performs a predetermined decoding process on the audio pack output from the stream separation unit 30, and outputs audio data.
The video decoder 36 performs a predetermined decoding process on the video pack output from the stream separation unit 30, and outputs video data. Sub picture decoder 40
Performs a predetermined decoding process on the sub-picture pack output from the stream separation unit 30, and outputs sub-picture data.

The video processor 44 generates image data in which video data output from the video decoder 36 and sub-picture data output from the sub-picture decoder 40 are synthesized according to an instruction from the system controller 60, and Output to 46. For example,
Image data is generated by combining subtitle sub-picture data output from the sub-picture decoder 40 with video data output from the video decoder 36.
The video encoder 46 converts digital image data output from the video processor 44 into an NTSC analog image signal. This image signal is output to, for example, a display device (not shown), thereby performing image reproduction.

The D / A converter 48 converts audio data output from the audio decoder 32 into an analog audio signal. When this audio signal is output from, for example, a speaker (not shown), audio sound is reproduced.

The operation unit 58 has a reproduction key for giving a title reproduction instruction, a selection key for giving a selection instruction in a multi-story reproduction operation or a multi-angle reproduction operation, or performs a branch selection again in the multi-story reproduction operation. For example, various operation keys such as a reselect key are provided, and a signal corresponding to the operation state of the key is output to the system controller 60.

The system controller 60 controls all functional blocks, such as outputting various servo commands to the servo controller 18 and outputting an image generation instruction corresponding to a user's operation instruction to the video processor 44. Further, the system controller 60 receives and analyzes the VMGI and VTSI included in the data output from the digital signal processing unit 24 and the NV_PCK output from the stream separation unit 30, and reproduces the data with respect to the stream separation unit 30 and the like. Performs various controls necessary for operation.

Also, the system controller 60
The PGCI required to display the branch selection screen in the multi-story reproduction operation is stored in M62.

The entire DVD reproducing apparatus 100 corresponds to data reproducing means, the system controller 60 corresponds to reproducing procedure control means, and the RAM 62 corresponds to branch information storing means.

(3) Operation of DVD Playback Apparatus Next, the operation of the above-described DVD playback apparatus 100 will be described. FIG. 8 is a flowchart showing an operation procedure when the multi-story reproduction operation is performed in the DVD reproducing apparatus 100, and shows an operation procedure when the previously displayed branch selection screen is displayed again and the branch selection is performed again. I have. Note that the branch selection screen and the story and PGC shown in FIG.
It is assumed that there is a correspondence relationship with

In parallel with the normal reproduction operation (step 100), the system controller 60 determines whether or not the reselect key of the operation unit 58 has been pressed (step 101), and whether or not the branch screen for story selection has been displayed. It is determined whether or not (step 102). For example, as shown in FIG. 5, when a reproducing operation corresponding to PGC # 1 is performed and a reproducing operation for displaying the branch selection screen 1 is performed, an affirmative determination is made in step 102, and then the system The controller 60 determines whether any of the stories corresponding to the plurality of options included in the displayed branch selection screen has been selected (Step 103). When the user operates the selection key of the operation unit 58 to select one of the stories, the system controller 60 next sets the PG constituting the PGC corresponding to the currently displayed branch selection screen.
The data necessary for displaying the branch selection screen among the contents of the CI is stored in the RAM 62 (step 104), and thereafter, the process returns to step 100 to continue the reproduction operation relating to the contents of the selected story.

In this way, each time the story progresses and the branch selection screen is displayed, the contents of the corresponding PGCI are stored in the RAM 62. FIG. 9 is a diagram showing an example of the contents stored in the RAM 62. The PGCI corresponding to each branch selection screen is stored in the RAM 62 in the order of storage from the storage area of the address 1. For example, when the branch selection screen 1 shown in FIG. 5 is displayed and the story B is selected, a part of the contents of PGCI # 1 corresponding to the branch selection screen 1 is stored in the storage area of the address 1 of the RAM 62. Is done. When the story further advances and the branch selection screen 2 is displayed and the story D is selected, the RAM 6
A part of the contents of PGCI # 2 corresponding to the branch selection screen 2 is stored in the storage area of address 2 of the second.

When the user depresses the reselect key of the operation unit 58 during the above-described reproduction operation, an affirmative judgment is made in step 101, and the system controller 60 is stored immediately before in the RAM 62. P
The contents of the GCI are read, and a branch selection screen specified by the PGCI is displayed (step 105).
Then, wait for the user to select a story (step 10).
3) or a state of waiting for reselection input (step 106). When the reselect key is pressed again, another previous branch selection screen is displayed (step 105). When a story selection is made, the next branch selection screen is displayed in the reproduction order of the current branch selection screen. Then, the data stored in the RAM after the branch selection screen located at (1) is deleted (step 104).
Thereafter, the process returns to the above-described step 103, and the processing after determining whether or not any story has been selected is repeated.

For example, considering the case where the story F shown in FIG.
As shown in FIG. 9, PGCI # 1, P
Each content of GCI # 2 and PGCI # 4 is stored.
In this state, when the user presses the reselect key of the operation unit 58, the content of the PGCI # 4 stored in the RAM 62 at last is read. PGCI
In # 4, information for specifying a VOB related to the progress of the story D is included. In this VOB, the display contents of the branch selection screen 4 and, when each option is selected, Since information such as whether to process the PGC is included, by reading out the contents of PGCI # 4 from the RAM 62, it is possible to restart the reproduction operation from the display of the previous branch selection screen 4.

As described above, in the DVD reproducing apparatus 100 of this embodiment, every time a branch selection screen is displayed and a story is selected, the contents of the program chain information (PGCI) corresponding to this branch selection screen are stored in the RAM 62. When the user presses a reselect key provided on the operation unit 58, the contents of the PGCI stored in the RAM 62 are read out to reproduce the contents of the previous branch selection screen. Actions can be taken. Therefore, returning to the branch of the previous story, it is possible to select a story different from the current one and continue the playback operation, so there is no need to restart the playback operation from the beginning to select another story, The branch selection can be redone with a simple operation and in a short time.

In particular, the branch selection screen is displayed, and every time any of the stories is selected, the contents of the corresponding PGCI are stored in the RAM 62. Therefore, all the branch selection screens displayed so far are re-displayed. It can be displayed, and the user can redo all the story selections that have been reproduced up to that point.

It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, in the above-described embodiment, the contents of all the corresponding PGCIs are stored in order to redisplay the branch selection screen reproduced up to that point, but the contents of the PGCI corresponding to the branch selection screen displayed immediately before are stored. RA only
It may be stored in M62.

In the above-described embodiment, the RAM 62
Although the content of the PGCI is stored in the PGCI, instead of storing the content of the PGCI itself, only the corresponding PGCI number may be stored. In this case, the content of the PGCI corresponding to this number is read from the DVD 10 again. However, the previously displayed branch selection screen can be displayed again, and the story can be selected again.

[0047]

As described above, according to the present invention, the branch information necessary for repeating the reproduction operation by returning to the branch selection screen for instructing the selection of the story is stored in the branch information storage means. When the user instructs re-selection of the story branch, the display returns to the branch selection screen specified by the branch information and the reproduction operation is repeated, so that the user simply performs a simple operation. hand,
The reproduction operation can be repeated from the branch selection of the story in a short time.

[Brief description of the drawings]

FIG. 1 is a diagram showing a structure of a volume space of a DVD.

FIG. 2 is a diagram showing a data structure of a VMG.

FIG. 3 is a diagram showing a data structure of a VTS.

FIG. 4 is a diagram showing an example of the structure of a PGC.

FIG. 5 is a diagram illustrating P processed in a multi-story reproduction operation.
It is a figure which shows the correspondence of GC with a story and a branch selection screen.

FIG. 6 is a diagram showing a data structure of a VOB.

FIG. 7 is a diagram illustrating an overall configuration of a DVD playback device according to one embodiment.

FIG. 8 is a flowchart showing an operation procedure when performing a multi-story reproduction operation in the DVD reproduction device.

FIG. 9 is a diagram showing an example of the contents stored in a RAM.

FIG. 10 is a diagram showing an outline of story branching in a conventional DVD reproducing apparatus.

[Explanation of symbols]

 Reference Signs List 10 DVD 18 Servo control unit 24 Digital signal processing unit 30 Stream separation unit 32 Audio decoder 36 Video decoder 40 Sub-picture decoder 44 Video processor 58 Operation unit 60 System controller 62 RAM

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C053 FA06 FA24 GB02 GB06 GB11 GB12 GB15 GB21 HA21 HA29 HA33 HA40 JA24 JA30 KA01 KA05 KA24 LA06 5D077 AA28 BA08 BA14 CA02 CB06 DC16 DC23 DC37 DF01 DG10 EA31

Claims (3)

[Claims] 1. A data reproducing means for reading a signal recorded on a disk-type recording medium to reproduce a video and an audio, and a branch selection screen for instructing a selection of a story is displayed to select a story at a branch destination. When returning to the display of the branch selection screen, the branch information storage means for storing the branch information necessary to repeat the reproduction operation by the data reproduction means, when a re-selection of story branch selection is instructed, Reproduction procedure control for reading the branch information stored in the branch information storage means, returning to the display of the branch selection screen specified by the branch information, and instructing the data reproduction means to repeat the reproduction operation. Means, and a disk reproducing apparatus comprising: 2. The branch selection screen according to claim 1, wherein the branch information storage unit stores the branch information corresponding to each of the plurality of branch selection screens displayed in order as the story progresses. The reproduction procedure control means reads out the branch information stored in the branch information storage means immediately before when a re-selection of a story branch is instructed, wherein the reproduction procedure control means reads out the branch information. apparatus. 3. The disc reproducing apparatus according to claim 1, wherein the branch information is program chain information corresponding to the branch selection screen.