JP2000298918A - Disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain disk reproducing device where angle switching is quickly performed in the multi-angle reproducing operation. SOLUTION: When angle switching is instructed, a system controller 60 discriminates whether an interleaved unit (ILVU) before angle switching stored in a RAM 26 can be substituted with another ILVU after angle switching while keeping the state free from breaks of reproduced pictures or not; and if it can be substituted, another ILVU after angle switching is read out from a DVD 10 and is stored in the RAM 26 to perform the control for ILVU substitution.

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 types of data are mixedly stored on a DVD by employing image data compression technology and audio data compression technology based on 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,
By shooting a single subject from a plurality of directions or separately shooting a plurality of subjects, video data in a plurality of shooting directions (up to 9 angles) is stored, and the angle selected by the user during reproduction is stored. A function that can reproduce video data (multi-angle function), and a function that can change the development of stories according to the user's selection by storing video data and audio data corresponding to multiple stories (Multi story function) can also be realized. The DVD reproducing device performs a reproducing operation of a DVD storing such various data.

FIG. 12 is a diagram showing a configuration of a conventional DVD reproducing apparatus, and shows a partial configuration until data read from a DVD is input to a decoding unit.
As shown in FIG.
A data read unit 502 for reading data recorded in the VD, a track buffer 504 for temporarily storing data output from the data read unit 502, and a decoding process for data output from the track buffer 504 are performed. And a decoding unit 506 for performing image reproduction processing.

FIG. 13 is an explanatory diagram of a multi-angle function realized in the disk reproducing apparatus 500 shown in FIG. For example, in blocks 2 to 4, images of a plurality of angles are recorded, and the user can select an arbitrary angle. In order to realize such a multi-angle function, data in units of blocks is recorded on a DVD. When reading data from a DVD, data at an angle designated by a user is selectively read, and arbitrary data is read. The playback operation corresponding to the angle of is performed. For example, when the user selects the angle 3 during the reproduction operation corresponding to the blocks 2 to 4 shown in FIG. 13, the data read unit 502 sets the angle 3 in the blocks 2 to 4 as shown in FIG. Are selectively read out and stored in the track buffer 504. After that, the data of the angle 3 stored in the track buffer 504 is read out in the storage order,
At 06, reproduction of an image or the like corresponding to the angle 3 is performed.

In the DVD-Video standard, for example, the storage capacity of the track buffer 504 is set to 4 Mbits and the data capacity between the data read unit 502 and the track buffer 504 is set so that the reproduced image is not interrupted even when the angle is switched. The transfer rate between the track buffer 504 and the decoding unit 506 is up to 10.08 Mbit / sec (the transfer rate between the track buffer 504 and the decoding unit 506 is up to 10.08 Mbit / sec (up to 8 Mbit / sec when transferring ILVU). Seconds).

[0007]

However, as described above, the track buffer 50 is provided in the DVD player 500.
4 is useful for preventing the image from being interrupted, but it takes a long time from when the angle switching instruction is issued by the user to when the angle switching is actually performed, causing a sense of discomfort to the user. There was a problem of letting it.

For example, as shown in FIG.
Is read from the track buffer 504, and when the decoding unit 506 performs a reproducing operation corresponding to the angle 3, the data corresponding to the angle 3 of the block 3 is already pre-read and stored in the track buffer 504. It is assumed that At this point, if the user selects Angle 1 and instructs angle switching, the data reading position in the data reading unit 502 is changed, and Angle 1 of Block 4 is changed.
Is started. Therefore, the data of the angle 3 is used for the next block 3, and the angle is actually switched from the reproduction operation corresponding to the angle 4 after that. For this reason, the reproduction of several blocks of data already stored in the track buffer 504 is continued in the state before the angle switching from the time the user issues the angle switching instruction to the time the angle switching is actually performed. It took time until the reproduction operation after the angle switching was started.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a disk reproducing apparatus capable of quickly switching angles in a multi-angle reproducing operation.

[0010]

In order to solve the above-mentioned problems, a disk reproducing apparatus according to the present invention selectively compresses compressed data corresponding to a plurality of different angles at the same image reproduction timing. When the angle to be reproduced is switched after the data is stored in the data storage means, the rereading instruction means sends the same signal to the signal processing means as the compressed data corresponding to the already read and stored angle before switching. An instruction to read the compressed data at the switching destination angle of the reproduction timing is issued, and the read compressed data is replaced by the data replacing means in accordance with the instruction. Therefore, when the angle switching is instructed, the compressed data of the switching angle previously stored in the data storage unit is not read out but the compressed data of the pre-switching angle already stored in the data storage unit is reproduced. The compressed data of the switching destination angle having the same timing can be newly read, and the reproducing operation corresponding thereto can be performed, and the angle switching in the multi-angle reproducing operation can be rapidly performed.

The data storage means described above stores compressed data corresponding to each of a plurality of different angles in units of interleaved units, and switches compressed data to be read out in units of interleaved units. It is desirable to do.
By switching the compressed data to be read in units of interleaved units, seamless playback in which playback is performed without interrupting images becomes possible, and angle switching can be performed quickly and naturally.

When storing compressed data corresponding to one of the angles in the data storage means, angle information necessary for reading compressed data corresponding to another angle at the same reproduction timing is created, and the compressed information is generated. It is desirable to store the data in the data storage means in correspondence with the data. By holding this angle information, it becomes possible to read the compressed data of another switching destination angle whose read timing has already passed, and to replace the compressed data described above.

The above-described re-reading instructing means replaces the compressed data corresponding to the pre-switching angle with the compressed data corresponding to the switching destination angle so that the reproduced image is not interrupted so that the reproduced image is not interrupted. It is desirable to specify the reading position of the. Depending on the capacity of the compressed data to be played back when the angle switching is instructed, the capacity of the compressed data to be read next, etc., the replacement of the compressed data may not be in time, and the playback image is interrupted. Therefore, by setting the compressed data reading position to avoid such inconvenience, it is possible to prevent the display of the unnatural reproduced image, and to make the uncomfortable or uncomfortable feeling when viewing the reproduced image. Etc. can be reduced.

[0014]

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 one or more 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).

VMGI includes information on VTS (for example, the number of VTS, identification information of each VTS, each VTS in the DVD).
Storage order, etc.), the display order of the titles displayed in the title menu, and one or more program chain information (PG
CI) and a disc ID (DVD
_ID) and the like. VMGM_VOBS is 1
It is composed of one or more video objects (VOB). This VOB includes video data that is playback data when a menu screen (title menu screen) 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 the title.
Information about titles such as TS_ID, one or more PGs
CI and the like are included. VTSM_VOBS and VT
STT_VOBS is composed of one or more 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 reproducing operation, is composed of program chain information (PGCI) and one or a plurality of VOBs. For example, one PGCI in VMGI and V
PGC is constituted by one or a plurality of VOBs in MGM_VOBS. Also, one PGC in the VTSI
PGC is constituted by I and one or a plurality of VOBs in VTSM_VOBS. Or 1 in VTSI
A PGC is composed of the PGCIs and one or a plurality of VOBs in VTSTT_VOBS.

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 includes various data necessary for reproducing the corresponding content when any item in the title menu is selected.

FIG. 4 is a diagram showing an example of the structure of the PGC, in which PGCI in VMGI and 1 in VMGM_VOBS are included.
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 are
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 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.

In the multi-angle function, for example, when a plurality of subjects are individually photographed, one cell contains video data of one angle in a predetermined reproduction time zone. Then, each cell is a DVD-Video
It is divided into interleaved units (ILVU) of a predetermined size according to the standard. The start address of each ILVU can be determined by the DSI described later. Each angle is specified by an angle number.

FIG. 6 is a diagram showing the correspondence between cells and ILVU and ILVB, showing an example in which video data of three angles (angle 1 to angle 3) is stored in each cell. . As described above, since one cell includes one angle of video data in a predetermined reproduction time period, three angles of video data in a predetermined reproduction time period are included in three cells. Become. That is, video data of angle 1 in a predetermined reproduction time zone is included in cell # 1, video data of angle 2 is included in cell # 2, and video data of angle 3 is included in cell # 3.

Each cell is divided into interleaved units (ILVU). For example, when one cell is divided into four ILVUs, as shown in FIG. 6, cell # 1 including video data of angle 1
Are C # 1 ILVU # 1 and C # 1 ILV
4 for U # 2, C # 1 ILVU # 3, C # 1 ILVU # 4
The cell is divided, and an angle cell (AGL_C # 1) is configured by these C # 1 ILVU # 1 and the like. Similarly, cell # 2 including the video data of angle 2 includes C # 2ILVU # 1, C # 2ILVU # 2, and C # 2 in the order of the reproduction time zone.
ILVU # 3 and C # 2 ILVU # 4 are divided into four, and an angle cell (AG) is divided by these C # 2ILVU # 1 and the like.
L_C # 2). Cell # 3 including the video data of Angle 3 is C # 3 ILVU in the order of the reproduction time zone.
# 1, C # 3ILVU # 2, C # 3ILVU # 3, C #
3ILVU # 4, and these C # 3ILVU
An angle cell (AGL_C # 3) is constituted by # 1 and the like. In this case, C # 1ILVU # 1, C # 2I
LVU # 1 and C # 3ILVU # 1 belong to the same playback time zone, and include angle blocks (AGL_BLK #).
Construct 1). Similarly, C # 1 ILVU # 2, C # 2I
LVU # 2 and C # 3ILVU # 2 belong to the same playback time zone and form angle blocks (AGL_BLK # 2). Also, C # 1ILVU # 3, C # 2ILV
U # 3 and C # 3ILVU # 3 belong to the same playback time zone and constitute an angle block (AGL_BLK # 3), and C # 1ILVU # 4, C # 2ILVU # 4 and C # 3.
ILVU # 4 belongs to the same playback time zone and forms an angle block (AGL_BLK # 4). Each ILVU
Is a video object unit (VOBU) described later
Are included.

The ILVB is composed of a plurality of ILVUs. For example, as shown in FIG.
C # 1 ILVU # 1, C # belonging to AGL_BLK # 1
2ILVU # 1, C # 3ILVU # 1, and AGK_BL
C # 1ILVU # 2, C # 2ILVU # belonging to K # 2
2, C # 3 ILVU # 2 and C # 1 ILVU # 3, C # 2 ILVU # 3, C # 3I belonging to AGL_BLK # 3
LVU # 3 and C # 1IL belonging to AGL_BLK # 4
VU # 4, C # 2 ILVU # 4, and C # 3 ILVU # 4.

In the multi-angle reproduction operation, IL
From among the angle blocks constituting the VB, the ILVUs corresponding to the selected angle are decoded one by one in the order of the reproduction time zone. For example, when reproducing the video data of angle 1, C # 1 ILVU # 1, C # 1
# 1ILVU # 2, C # 1ILVU # 3, C # 1ILV
Decoding is performed in the order of U # 4. Also, angle 1
When the video data is switched to the angle 2 during the reproduction of the video data, for example, after decoding the C # 1 ILVU # 1, the decoding process is performed on the C # 2 ILVU # 2.

FIG. 7 is a diagram showing the structure of a cell. As shown in the figure, each cell is composed of one or more video object units (VOBU). Each V
The OBU includes a navigation pack (NV_PCK), a video pack (V_PCK), and a sub-picture pack (SP
_PCK) and at least one of an audio pack (A_PCK).

NV_PCK contains reproduction control information (PC
I) and data search information (DSI). In the PCI and the DSI, the data amount of the VOBU, the reproduction time, the position of the VOBU to be reproduced next, and the like are set. In addition, the seamless angle information (S
ML_AGLI). This SML_AGL
In I, the address and data amount (SML_AGL_Cn_DSTA) of the ILVU included in each angle cell are set.

V_PCK, SP_PCK, A_PCK
Indicates the type of playback data (video, sub-picture,
Pack header and packet header that contain information such as audio), compressed video data, sub-picture data, and audio data (compressed playback data)
It is comprised including.

(2) Overall Configuration of DVD Playback Apparatus FIG. 8 is a diagram showing an overall configuration of a DVD playback apparatus according to an embodiment to which the present invention is applied. A DVD reproducing apparatus 100 shown in FIG. 1 includes a data reading unit 11 for reading data (signal) recorded on a DVD 10 and an RF amplifier 22 for amplifying the read signal and performing image display and audio output. , Digital signal processing unit 24, RAM 26, decoding unit 28, video processor 44, video encoder 46, display device 47, digital-analog (D
/ A) It is configured to include a converter 48 and a speaker 49, an operation unit 58 for a user to input various operation instructions, and a system controller 60 for controlling the entire DVD playback device 100. .

The data read section 11 includes a spindle motor 12, an optical pickup 14, a feed motor 16, and a servo control section 18. The spindle motor 12 rotates the DVD 10 at a constant linear speed. The optical pickup 14 detects data recorded on the DVD 10 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.

In the multi-angle reproduction operation, the servo control unit 18 sets the ILVU corresponding to the angle selected from the angle blocks constituting the ILVB to 1 according to the instruction of the system controller 60.
So that they are read from the DVD 10 one by one
Performs various servo controls.

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 and a track jump occurs, the RF amplifier 22 performs a track jump. 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 outputs VMGI and VTSI to the system controller 60 and stores the cells in the RAM 26. Then, the digital signal processing unit 24 extracts the VOBU constituting the cell stored in the RAM 26 and outputs the VOBU to the decoding unit 28 according to the instruction of the system controller 60.

In the multi-angle reproduction operation, the digital signal processing section 24 stores the ILVUs sequentially inputted in the reproduction time zone in the RAM 26. Then, the digital signal processing unit 24 reads the ILVUs stored in the RAM 26 in the order of the reproduction time zone in accordance with the instruction of the system controller 60, and reads the VOBs constituting the ILVUs.
U is output to the decoding unit 28. When the angle switch is instructed, the digital signal processing unit 24 responds to the instruction from the system controller 60 to store the IL before the angle switch stored in the RAM 26 and before the read.
The VU is changed to the ILVU after the angle switching to be input.
Replace with

The decoding unit 28 includes a buffer RAM 3
4, 38, 42, a stream separation unit 30, an audio decoder 32, a video decoder 36, and a sub-picture decoder 40.

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 the video data output from the video decoder 36 and the sub-picture data output from the sub-picture decoder 40 are synthesized in accordance with an instruction from the system controller 60. Output to 46. The video encoder 46 converts the image data output from the video processor 44 into an image signal for display. By outputting this image signal to the display device 47,
The image is displayed.

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 to the speaker 49, the audio sound is reproduced.

The operation unit 58 is located at a playback key for giving an instruction for title playback, an angle switching key for giving an instruction for angle switching in a multi-angle playback operation, left / right / up / down cursor keys, and a cursor position on the display screen. Various operation keys such as a setting key for fixing an item are provided, and a signal corresponding to an 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 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 executes the navigation command included in these to perform stream processing. Various controls necessary for the reproduction operation are performed on the separation unit 30 and the like.

In the multi-angle reproduction operation, the system controller 60 sets the ILVU corresponding to the angle selected from the angle blocks constituting the ILVB one by one in the reproduction time zone in the order of the DVD 10.
And outputs various servo commands to the servo control unit 18 so as to read out the ILVUs stored in the RAM 26 in the order of the reproduction time band, and decodes the VOBUs constituting the ILVUs into the decoding unit. 28 is output.

Also, the system controller 60
The angle information corresponding to each ILVU stored in M26 is generated, and the angle information is written to a part of the storage area of RAM 26. Angle information has a corresponding I
The block number of the angle block to which the LVU belongs, the address of each ILVU belonging to the angle block in the DVD 10, and the data amount are included. The block numbers of the angle blocks are assigned in the order of the reproduction time zone. For example, the angle block (AGL_BLK #) shown in FIG.
1 to AGL_BLK # 4), block number 1 is assigned to AGL_BLK # 1 corresponding to the first playback time zone, and AGL_BLK corresponding to the second playback time zone.
Block number 2 is assigned to # 2, block number 3 is assigned to AGL_BLK # 3 corresponding to the third playback time zone, and AGL_BLK # 4 corresponding to the last playback time zone.
Is assigned a block number 4. The address and data amount in the DVD 10 of each ILVU belonging to the angle block can be obtained by analyzing the seamless angle information (SML_AGLI) included in the DSI.

FIG. 9 shows the IL stored in the RAM 26.
FIG. 4 is a diagram illustrating a correspondence between VUs and angle information. FIG.
The ILVU is configured as shown in FIG.
Is selected, as shown in FIG.
26, C # 1ILVU # 1, C # 1ILVU # 2,
C # 1 ILVU # 3... Are stored in this order. Then, for example, the angle information corresponding to C # 1 ILVU # 1 includes:
Angle block (AGL) to which C # 1 ILVU # 1 belongs
_BLK # 1) and A (block number 1)
Each ILVU belonging to GL_BLK # 1 (C # 1 ILVU
# 1, C # 2ILVU # 1, C # 3ILVU # 1) D
The address and data amount in the VD 10 are set.

When the user presses the angle switch key provided on the operation unit 58 to instruct the angle switch, the system controller 60 reads out the data from the RAM 26 at that time and sets it as a target of decoding processing. For each ILVU to be decoded after the current ILVU (ILVU before angle switching stored in the RAM 26), it is determined whether or not there is an ILVU that can be replaced with the ILVU after angle switching. I do.

Specifically, the system controller 60
Recognizes the amount of ILVU data read from the RAM 26 at that time and subjected to decoding processing, based on the angle information stored in the RAM 26. At that time, the system controller 60
Read from the target and decoded
VU and ILVU RAM to be played before and after it
The maximum transfer rate between the RAM 26 and the decoding unit 28 defined according to the position in the RAM 26 is derived. Then, the system controller 60 divides the data amount of the ILVU read from the RAM 26 and subjected to the decoding process by the maximum transfer rate between the RAM 26 and the decoding unit 28, thereby reading the data from the RAM 26 at that time. The playback time of the output ILVU to be decoded is calculated. Next, the system controller 60
Is subtracted from the reproduction time by the elapsed time from the start of the transfer of the VOBU constituting the ILVU read out from the RAM 26 and subjected to the decoding process to the decoding unit 28, thereby obtaining the RAM 26
Read from the target and decoded
The remaining time until the end of the reproduction of the VU (hereinafter referred to as “remaining reproduction time”) is calculated.

Also, the system controller 60
Based on the angle information stored in the M26, the last address of the ILVU in the DVD 10 stored in the RAM 26 and the decoding process next to the ILVU read out of the RAM 26 and subjected to the decoding process at that time. By recognizing the address in the DVD 10 of the angle-switched ILVU, which is a replacement candidate of the target angle-changed ILVU, the time required for the angle-switched ILVU data search is calculated. Next, based on the angle information, the system controller 60 recognizes the data amount of the angle-switched ILVU that is a replacement candidate.
Then, the system controller 60 determines the data search time and the IL after the angle switching, which is a replacement candidate.
Based on the data amount of the VU and the transfer rate between the data read unit 11 and the RAM 26, the angle-switched ILVU which is a replacement candidate is read from the DVD 10 and read from the RAM 26.
(Hereinafter, referred to as “reading time”).

When the reading time is shorter than the remaining reproduction time, the system controller 60 does not interrupt the image in the seamless switching, and is read from the RAM 26 at that time and is subjected to the decoding process. After the ILVU, the ILVU to be decoded before the angle switching is replaced by the ILVU after the angle switching.
It is determined that it is possible to replace the VU with the VU, and based on the angle information, the replacement candidate I
The LVU is read from the DVD 10 and the ILVU before the angle switching stored in the RAM 26 is replaced with the ILVU after the angle switching.

If the reading time is longer than the remaining reproduction time, the system controller 60 interrupts the image in the seamless switching.
It is determined that it is impossible to replace the ILVU that has been read from M26 and that is to be decoded next to the ILVU that is to be decoded next, before the angle switch, to the ILVU that has been angle-switched. Then, the system controller 60 determines whether each ILVU before the angle switching to be decoded after the ILVU before the angle switching that cannot be replaced can be similarly replaced with the ILVU after the angle switching. By repeating this determination, it is determined whether the ILVU after the angle switching can be replaced with the ILVU after the angle switching among the ILVUs before the angle switching stored in the RAM 26. If the replacement is possible, the system controller 60 reads the replacement candidate ILVU, which is a replacement candidate, from the DVD 10 based on the angle information, and stores the ILVU before the angle switching stored in the RAM 26 in the RAM 26.
Control is performed to replace the VU with the ILVU after the angle switching.

If all the ILVUs stored in the RAM 26 before the angle switching cannot be replaced,
The system controller 60 controls normal angle switching. That is, the system controller 60
Without replacing the ILVU stored in the AM 26 before the angle switch, the ILVU read from the DVD 10 is controlled to read the ILVU after the angle switch and store the ILVU in the RAM 26 next.

FIG. 10 is a diagram showing an example of ILVU replacement transition. It is assumed that the ILVU is configured as shown in FIG. For example, as shown in FIG. 10A, the ILV corresponding to the angle 1 is stored in the RAM 26.
U (C # 1 ILVU # 1, C # 1 ILVU # 2, C # 1
ILVU # 3), and C # 1 ILVU # 1
It is assumed that the instruction to switch to the angle 2 is issued when is read and subjected to the decoding process.

In this case, the system controller 60
Recognizes the data amount of C # 1 ILVU # 1 which is read from the RAM 26 at that time and is to be decoded based on the angle information stored in the RAM 26, and The playback time of C # 1 ILVU # 1 is calculated based on the maximum transfer rate between the units 28, and from this playback time, C # 2 ILVU # 1 is calculated.
Is subtracted from the time elapsed from the start of the transfer of the VOBU constituting
The remaining time until the reproduction of VU # 1 ends is calculated.
Further, based on the angle information stored in the RAM 26, the system controller 60
Of the C # 1 ILVU # 3 stored in the DVD 10 is recognized. Next, the system controller 60
ILVU to be decoded next to C # 1 ILVU # 1 based on the angle information (C # 1ILVU # 2)
The data search time of C # 2ILVU # 2 is calculated by recognizing the address in the DVD 10 of C # 2ILVU # 2, which is a replacement candidate of. Next, based on the data search time, the data amount of the replacement candidate C # 2ILVU # 2, and the transfer rate between the data read unit 11 and the RAM 26, the system controller 60 transmits the replacement candidate C # 2ILVU. The time required to read # 2 from the DVD 10 and store it in the RAM 26 is calculated.

Then, the system controller 60 determines the replacement candidate C # 2ILVU from the remaining time until the decoding process of the C # 1ILVU # 1 read out from the RAM 26 and subjected to the decoding process at that time is completed.
In the case where the time required to read # 2 from the DVD 10 and store it in the RAM 26 is short, it is determined that replacement is possible and FIG.
As shown in FIG. 0 (B), C # 2ILVU #
2 and C # 2ILVU # 3 are read out, and C # 1IL
VU # 2 and C # 1ILVU # 3 are converted to C # 2ILVU #
2 and C # 2 ILVU # 3.

Further, the system controller 60 determines that the replacement candidate C # 2ILVU # is a replacement candidate based on the remaining time until the decoding process of the C # 1ILVU # 1 read out from the RAM 26 and subjected to the decoding process is completed.
If the time from reading the DVD 10 to the DVD 26 and storing it in the RAM 26 is long, it is determined that replacement is impossible and C #
The ILVU (C # 1ILVU # 3) to be decoded next to 1ILVU # 2 is converted to C # 2ILVU # 3.
It is determined whether or not it can be replaced by the same procedure as the procedure described above. If the replacement is possible, the system controller 60 returns to FIG.
As shown in (C), the DVD # 10 receives the C # 2 ILVU #
3 and read C # 1ILVU # 3 to C # 2ILVU.
Control to replace with # 3 is performed. If the replacement is not possible, the system controller 60 does not perform the control for replacement, and reads C # 2ILVU # 4 from the DVD 10 and stores it in the RAM 26 in the same manner as in the conventional angle switching operation. I do.

The data read section 11, RF amplifier 22, digital signal processing section 24, system controller 60 serve as signal processing means, RAM 26 serves as data storage means, and system controller 60 serves as reread instruction means.
The digital signal processing unit 24 corresponds to the data replacing unit, the decoding unit 28, the video processor 44, the video encoder 46, and the system controller 60 correspond to the data reproducing unit.

(3) Operation of DVD Reproducing Apparatus Next, the operation of the above-described DVD reproducing apparatus 100 will be described. FIG. 11 is a flowchart showing the operation procedure of the multi-angle playback operation in the DVD playback device 100. The system controller 60 determines whether the user has loaded the DVD 10 (step 100). DVD
10 is loaded, then the system controller 60
Displays the opening screen for a certain period of time (step 101), and then displays the title menu screen (step 102). For example, VMG (Video Manager)
A VOB (video object) corresponding to the opening screen is read out based on the PGCI (program chain information) included in, and a predetermined opening screen is displayed. Also, based on PGCI_UT (program chain information unit table) in VMGI,
Since the reproduction position of the title menu displayed next to the opening screen can be specified, the display operation of the title menu is started.

Next, the system controller 60 determines whether a title has been selected (step 10).
3). When the user operates the cursor key of the operation unit 58 to move the cursor to the title displayed in the title menu and further presses the setting key to confirm the title selection, the system controller 60 sets the selected title. Start playback (step 10).
4).

Next, the system controller 60 sets the IL
It is determined whether the VB is a processing target and the multi-angle function is enabled (step 105). When the multi-angle function is enabled, the system controller 60 reads the ILVUs corresponding to the angles selected from the angle blocks constituting the ILVB one by one from the DVD 10 in the order of the reproduction time zone, and sequentially reads them. R
Control for storing the data in the AM 26 is performed (step 106). For example, the ILVB shown in FIG. 6 is a processing target,
When the angle 1 is selected in the initial setting, the C # 1ILVU # 1 and the C # 1ILV
U # 2, C # 1 ILVU # 3, and C # 1 ILVU # 4 are sequentially read and stored in the RAM 26.

Then, the system controller 60 sets R
Angle information corresponding to each ILVU stored in the AM 26 is generated, and the angle information is stored in the RAM 26 (step 107).

Next, the system controller 60 sets the RA
The multi-angle playback operation is performed by reading the ILVUs stored in the M26 in the order of the playback time zone and causing the decoding unit 28 to perform the decoding process (step 10).
8).

When the multi-angle playback operation is started,
The system controller 60 determines whether or not the valid state of the multi-angle function is continued by analyzing the DSI of NV_PCK arranged at the head of the ILVU subjected to the decoding process in step 108 (step 109). ).

When the valid state of the multi-angle function continues, the system controller 60 determines whether or not the user has pressed the angle switch key provided on the operation unit 58 and instructed to switch the angle. (Step 110). When the angle switching is instructed, the system controller 60 reads the ILVU (RAM2) that is read from the RAM 26 at that time and is to be decoded after the ILVU that is to be decoded.
It is determined whether there is an ILVU that can be replaced with the ILVU after the angle switching (ILVU before the angle switching stored in No. 6) (step 11).
1).

If there is a replaceable ILVU,
The system controller 60 reads from the DVD 10 the angle-switched ILVU that is a replacement candidate
6, the ILVU before the angle switching is replaced with the ILVU after the angle switching (step 112). Then, the system controller 60
Is a control for reading the ILVUs corresponding to the switched angles from the angle blocks constituting the ILVB one by one in the order of the reproduction time zone from the DVD 10 in the order of the reproduction time zone, and sequentially storing the ILVUs in the RAM 26 (step 106). ) Repeat the subsequent operations.

If all of the ILVUs stored in the RAM 26 before the angle switching cannot be replaced (when a negative determination is made in step 111), the system controller 60 does not replace the ILVU and then proceeds to the next step. D
About ILVU read from VD10, ILVB
The ILVUs corresponding to the angle after switching are selected one by one from the angle blocks constituting the DVD1 in order of the reproduction time zone.
The operation after the control (step 106) for reading from 0 and sequentially storing the data in the RAM 26 is repeated.

If the angle switching has not been instructed (if a negative determination is made in step 110), the system controller 60 sets the ILVUs corresponding to the currently selected angle one by one in the order of the reproduction time zone.
, And sequentially store the data in the RAM 26 (Step 106) and subsequent operations are repeated.

If the multi-angle reproduction function is not valid (if a negative determination is made in step 105) or if the multi-angle reproduction function is not in an effective state (if a negative determination is made in step 109), the system controller is activated. 60 determines whether or not the reproduction of the title has been completed (step 113). When the reproduction of the title ends, a series of reproduction operations ends. If the reproduction of the title has not been completed, it is determined whether the multi-angle function has been activated again (step 10).
5) is performed.

As described above, the DVD reproducing apparatus 100 according to the present embodiment provides the ILVU corresponding to the selected angle.
Is read from the DVD 10 and stored in the RAM 26 in advance. When the angle switching occurs, the ILVU stored in the RAM 26 before the angle switching is stored in the RAM 26 without any interruption of the reproduced image.
Determine whether it is possible to replace with LVU,
When replacement is possible, the ILVU before the angle switching is replaced with the ILVU after the angle switching, so that the ILVU after the angle switching can be subjected to the decoding process at an early stage, and the angle switching can be performed quickly. In addition, it is possible to prevent the reproduced image from being interrupted.

The DVD reproducing apparatus 100 of the present embodiment
Corresponds to each ILVU stored in the RAM 26,
Since the angle information in which the block number of the angle block to which the LVU belongs, the address of each ILVU belonging to the angle block in the DVD 10 and the data amount are generated, the ILV based on the angle information is generated.
It is possible to easily determine whether or not it is possible to replace the U
10 can be quickly read out.

[0074]

As described above, according to the present invention, when the photographing direction is selected and designated, the reproduction timing corresponding to the selected and designated photographing direction is the same as the reproduction data already stored. Read from the disk-type recording medium and replace the already stored playback data, and can respond to the selected shooting direction without playing back the already stored playback data as in the past. Since the reproduced data to be reproduced can be reproduced at an early stage, it is possible to quickly switch the photographing direction.

[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 showing a data structure of a VOB.

FIG. 6 is a diagram showing the correspondence between cells and ILVU and ILVB.

FIG. 7 is a diagram showing a data structure of a cell.

FIG. 8 is a diagram illustrating an overall configuration of a DVD playback device according to an embodiment.

FIG. 9 is a diagram showing a correspondence between ILVU and angle information stored in a RAM.

FIG. 10 is a diagram showing an example of ILVU replacement transition.

FIG. 11 is a flowchart showing an operation procedure of a multi-angle playback operation in the DVD playback device of one embodiment.

FIG. 12 is a diagram showing an outline of a transfer route until data read from a DVD is input to a decoding unit in a conventional DVD reproducing apparatus.

FIG. 13 is an explanatory diagram of a multi-angle function realized in the disk reproducing device shown in FIG.

FIG. 14 is a diagram showing a data reading state corresponding to the multi-angle function.

FIG. 15 is a diagram illustrating a storage state of data of each block in a track buffer.

[Explanation of symbols]

 Reference Signs List 10 DVD 11 Data read unit 18 Servo control unit 24 Digital signal processing unit 26 RAM 28 Decoding unit 30 Stream separation unit 32 Audio decoder 36 Video decoder 40 Sub-picture decoder 44 Video processor 58 Operation unit 60 System controller

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/92 H04N 5/93 Z 5/93 G11B 27/00 D

Claims (4)

[Claims] 1. A signal processing means for reading out a signal recorded on a disk-type recording medium and outputting compressed data corresponding to an image, and a plurality of angles having the same image reproduction timing and different angles. Data storage means for selectively storing the corresponding compressed data; and when the angle to be reproduced is switched,
For the compressed data stored in the data storage unit and corresponding to the pre-switching angle at which the reproducing operation is not performed, the signal processing unit issues an instruction to read the compressed data corresponding to the switching destination angle at the same reproduction timing. Re-reading instructing means to send the compressed data of the switching destination angle read in accordance with the instruction of the re-reading instructing means to the compressed data of the pre-switching angle, and data stored in the data storage means. A data reproducing unit that reads the compressed data and performs an operation of reproducing the image. 2. The data storage unit according to claim 1, wherein the data storage unit stores the compressed data corresponding to each of the plurality of different angles in units of an interleaved unit. The switching of the compressed data is performed in units of the interleaved unit. 3. The method according to claim 1, wherein when the compressed data corresponding to any angle is stored in the data storage means, the compressed data corresponding to another angle at the same reproduction timing is read. A disk reproducing apparatus further comprising angle information creating means for creating necessary angle information and storing the angle information in the data storage means in correspondence with the compressed data. 4. The reproduced image is not interrupted by replacing the compressed data corresponding to the pre-switching angle with the compressed data corresponding to the switching destination angle, according to any one of claims 1 to 3. As described above, a disc reproducing apparatus for designating a reading position of compressed data corresponding to the switching destination angle.