JP2000195173A - Information reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information reproducing device capable of reducing a burden on a user to fulfill noise reduction function. SOLUTION: This information reproducing device comprises a reproducing means 1 to reproduce an information recording medium where the identification information is recorded, a setting means 3, 4, 5, 6 to set a noise reduction level, a noise reduction means 2 to reduce noise contained in a signal reproduced by the reproducing means based on the set noise reduction level, a storage means 3 to make the identification information correspond to the noise reduction level and store them, and a control means 4 to execute reduction in noise by the noise reduction means based on the noise reduction level made to correspond to this identification information and stored when a reproduction object by the reproduction means is an information recording medium corresponding to the identification information stored in the storage means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to an information reproducing apparatus for reproducing an information recording medium on which video data is recorded.

[0002]

2. Description of the Related Art Recently, DVDs have been used as large-capacity information storage media.
Optical disks such as (Digital Video Disk) are attracting attention. The information reproducing apparatus for reproducing the DVD has a noise reduction function, and exhibits a high effect in removing noise from a reproduced image reproduced from the DVD. Furthermore, some information reproducing apparatuses have been equipped with a three-dimensional noise reduction function that takes into account information in the time axis direction.

[0003] These noise reduction functions are turned on / off by a button operation,
Alternatively, the strength / weakness of the noise reduction function can be switched. Generally, the button operation described above
The user checks the image quality.

[0004]

However, in order for the noise reduction to function, the above-described button operation is required every time reproduction is performed, which is troublesome for the user.

SUMMARY OF THE INVENTION An object of the present invention has been made in view of the above-described circumstances. In making noise reduction work, it is desirable to reduce the burden on a user and to make noise reduction work according to the situation. An object of the present invention is to provide a possible information reproducing apparatus.

[0006]

Means for Solving the Problems To solve the above problems and achieve the object, an information reproducing apparatus of the present invention is configured as follows.

[0007] An information reproducing apparatus according to the present invention comprises a reproducing means for reproducing an information recording medium on which identification information is recorded, and a setting for setting a noise reduction level for reducing noise contained in a reproduced signal reproduced by the reproducing means. Means, noise reduction means for reducing noise included in the reproduction signal based on the noise reduction level set by the setting means,
When the object of noise reduction by the noise reduction unit is a predetermined information recording medium based on the predetermined noise reduction level set by the setting unit, the identification information of the predetermined information recording medium and the predetermined noise reduction level correspond. Storage means for additionally storing, and a reproduction target by the reproduction means,
In the case of the predetermined information recording medium corresponding to the identification information stored in the storage unit, reproduction is performed from the predetermined information recording medium based on the predetermined noise reduction level stored in association with the identification information. Control means for reducing noise included in the reproduction signal by the noise reduction means.

[0008]

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

Referring to FIGS. 1 and 2, the data structure of an information recording medium (optical disk) applied to the information recording / reproducing apparatus according to the present invention will be described.

[0010] Data having a data structure as shown in FIG. 1 is recorded on the optical disk. Lead-in area 27
Is allocated as a volume space 28. This volume space 28 includes a volume / file management area 70,
And a data area DA. In the volume / file management area 70, information on volume and file structure is recorded. The data recorded in the data area DA will be described later in detail.

The volume space 28 is physically divided into a number of sectors, and these physical sectors are numbered consecutively. The logical address of the data recorded in the volume space 28 means a logical sector number. The logical sector size here is 2048 bytes (2 Kbytes), like the effective data size of the physical sector. The logical sector numbers are assigned consecutive numbers in ascending order of the physical sector numbers. Note that unlike the logical sector, redundant information such as error correction information is added to the physical sector. For this reason, the physical sector size does not exactly match the logical sector size.

That is, the volume space 28 has a hierarchical structure, and the volume / file management information 7
0 and a data area DA. The area included in the volume space 28 is partitioned on the boundary between logical sectors. Here, one logical sector is 20
48 bytes are defined, and one logical block is also defined as 2048 bytes. Therefore, one logical sector is defined as being equivalent to one logical block.

The lead-in area 27 has a sector number (End sector numbe) of an end sector of the data area DA.
r of the Data Area) is recorded. The sector number of the end sector of the data area DA is not the same for all disks but is gusset. Therefore,
The sector number of the end sector of the data area DA recorded in the lead-in area 27 can be used as disc identification information.

The data area DA is provided with a data recording area in which predetermined data is recorded. In this data area DA, mixed recording of computer data, audio data and video data is possible. In this data area DA, the recording order of computer data, audio data and video data, and the size of each recording information are arbitrary. In FIG. 1, the area where computer data is recorded is described as computer data areas DA1 and DA3, and the area where audio / video data is recorded is described as audio / video data area DA3.

In the audio / video data area DA2, control information DA21, video object DA22,
A picture object DA23 and an audio object DA24 are recorded. The control information DA21 is control information necessary for performing each process of recording (recording), reproduction, editing, and searching. The video object DA22 is recording information (moving image data) of the contents of the video data. The picture object DA23 is a still image such as a slide or a still, information for searching for a desired place in video data, and information on an editing thumbnail in the video data. The audio object DA24 is recording information of the contents of audio data.

The video manager VMG is composed of a plurality of files 74A. This file 74A contains
Information for managing the video title sets (VTS # 1 to #n) 72 (video manager information VMGI, video object set for video manager menu VMGM_)
VOBS, video manager information backup file VMGI_BUP).

The video manager information VMGI includes a video manager information management table VMGI_M
AT is included, and the video manager information management table VMGI_MAT includes a video manager end address VMG_EA. The video manager end address VMG_EA indicates the end address of the video manager VMG.

Each video title set VTS72 includes:
Video data compressed according to the MPEG standard (video pack described later), audio data compressed or uncompressed according to a predetermined standard (audio pack described later),
And run-length-compressed sub-picture data (sub-picture pack described later; including bitmap data in which one pixel is defined by a plurality of bits) and information for reproducing these data (navigation pack described later; presentation control) Information PCI and data search information DSI).

The video title set VTS72 also has a plurality of files 74B, like the video manager VMG.
It is composed of The file 74B includes video title set information VTSI, a video title set menu object set VTSM_VOBS, and a video title set title video object set VT.
STT_VOBS and video title set information backup VTSI_BUP are included. The video title set information VTSI includes a video title set number, and each video title set can be identified by the video title set number.

Here, the video title set VTS
The number of (VTS # 1 to #n) 72 is limited to a maximum of 99, and the number of files 74B constituting each video title set VTS 72 is determined to be a maximum of 12.
These files 74A and 74B are similarly partitioned at the boundary of the logical sector.

In another recording area 73, information usable in the above-described video title set VTS 72 or other information unrelated to the video title set can be recorded. This area 73 is not essential, and may be deleted if not used.

As will be described later with reference to FIG. 2, a video object set VTST for a video title set title
T_VOBS defines a collection of one or more video objects VOB. Each VOB defines a collection of one or more cells. A collection of one or more cells constitutes a program chain PGC.

A plurality of cells constituting the program chain PGC can be interpreted as corresponding to various scenes in a drama. The contents of this PGC (or the contents of the cell)
Is determined, for example, by the software provider that produces the content recorded on the disc.

The program chain PGC includes reproduction information called program chain information PGCI and cells in the VOB required for reproducing the program chain PGC. The program chain information PGCI includes a program chain program map PGC_PGMAP. Program chain program map PG
C_PGMAP is a map indicating a program structure in the program chain PGC. In the program chain program map PGC_PGMAP, an entry cell number, which is a head cell number of the program, is recorded in ascending order together with the program number. That is, this program chain program map PGC_PGMAP
The specified program chain PGC can be specified by the program number recorded in the.

FIG. 2 shows a hierarchical structure of information included in the video object set VTSTT_VOBS of FIG.

As shown in FIG. 2, each cell 84 is composed of one or more video object units (VOBU) 85. Then, each video object unit 85
Is configured as an aggregate (pack sequence) of a video pack (V pack) 88, a sub-picture pack (SP pack) 90, and an audio pack (A pack) 91, starting with a navigation pack (NV pack) 86. I have.
That is, the video object unit VOBU85
Is defined as a set of all packs recorded from one navigation pack 86 to immediately before the next navigation pack 86.

Each of these packs is a minimum unit for performing data transfer processing. The minimum unit for performing logical processing is a cell unit, and the logical processing is performed for this cell unit.

The navigation pack 86 is incorporated in the video object unit VOBU 85 so that any angle change (non-seamless reproduction and seamless reproduction) can be realized.

The above-mentioned video object unit VOBU
The playback time of video object unit VOB is 85
This corresponds to the playback time of video data composed of one or more video groups (group of pictures; GOP for short) included in U85, and the playback time is 0.4 seconds to 1.
It is set within the range of 2 seconds. One GOP is usually about 0.5 seconds in the MPEG standard, and is screen data compressed so as to reproduce about 15 images during that time.

Video object unit VOBU85
Contains video data, a GOP (conforming to the MPEG standard) composed of a video pack 88, a sub-picture pack 90 and an audio pack 91 is arranged to form a video data stream. However, irrespective of the number of GOPs, the video object unit VOBU85 is determined based on the playback time of the GOP, and the beginning of the video object unit VOBU85 is always the navigation pack 86 as shown in FIG.
Are arranged.

It is to be noted that even in the case of reproduction data of only audio and / or sub-picture data, the reproduction data is constituted with the video object unit VOBU85 as one unit. For example, when the video object unit VOBU85 is composed of only the audio pack 91 with the navigation pack 86 at the head, the video object unit VO to which the audio data belongs is similar to the video object VOB83 of the video data.
The audio pack 91 to be reproduced within the reproduction time of the BU 85 is the video object unit VOBU8.
5 is stored.

Incidentally, a VOB having a structure as shown in FIG.
In an information recording / reproducing apparatus capable of recording a video title set VTS including an S82 on an optical disc, there is a case where it is desired to edit recorded contents after recording the VTS. To respond to this request, a dummy pack 89 can be inserted into each VOBU 85 as appropriate. This dummy pack 89
Can be used when recording editing data later.

As shown in FIG. 2, a video object set (VTSTT_VOBS) 82 is defined as a set of one or more video objects (VOB) 83. The video objects VOB 83 in the video object set VOBS 82 are used for the same purpose.

The menu VOBS 82 is usually composed of one VOB 83, which stores a plurality of menu screen display data. On the other hand, the VOBS 82 for the title set is usually composed of a plurality of VOBs 83.

Here, VOBs constituting the title set video object set VTSTT_VOBS 82
83 can be considered to correspond to video data of performances of a certain rock band, taking a concert video of the band as an example. In this case, by designating the VOB 83, for example, the third piece of the concert performance music of the band can be reproduced.

The VOB 83 forming the menu video object set VTSM_VOBS stores the menu data of all the concert performances of the band, and according to the display of the menu, the specific music,
For example, an encore performance song can be reproduced.

In a normal video program, one VOB 83 can constitute one VOBS 82. In this case, one video stream is one VO
It will be completed in B83.

On the other hand, for example, in an animation collection of a plurality of stories or an omnibus movie, one VO
A plurality of video streams (a plurality of program chains PGC) can be provided in the BS 82 corresponding to each story. In this case, each video stream is stored in the corresponding VOB 83. At that time, the audio stream and the sub-picture stream related to each video stream are also completed in each VOB 83.

The VOB 83 has an identification number (IDN # i;
i = 0 to i), and the VO
B83 can be specified. The VOB 83 includes one or a plurality of cells 84. Although a normal video stream is composed of a plurality of cells, a video stream for a menu may be composed of one cell 84 in some cases.
Each cell 84 is given an identification number (C_IDN # j) as in the case of the VOB 83.

FIG. 2 exemplifies a data string (pack string) in a pack format which is read out from the optical disk and obtained after signal demodulation / error correction as described above. This pack sequence includes a navigation pack (control pack) 86, a video pack 88, a dummy pack 89, a sub-picture pack 90, and an audio pack 91. All of these packs are composed of data in units of 2 Kbytes.

The navigation pack 86 includes a pack header 110, a reproduction control information / presentation control information (PCI) packet 116, and data search information (DS).
I) The packet 117 is included. PCI packet 11
6 includes control data used at the time of non-seamless angle switching, and the DSI packet 117 includes control data used at the time of seamless angle switching.

Here, the angle switching means changing the angle (camera angle) at which a subject image is viewed. In the example of a rock concert video, in the same music performance scene (same event), a scene captured mainly by a vocalist, a scene captured mainly by a guitarist,
This means that you can see scenes from various angles, such as scenes captured mainly by drummers.

Angle switching (or angle change) is performed when the angle can be selected according to the viewer's preference, or when the same scene is automatically changed in the flow of the story while changing the angle. (If the software creator / provider configured the story in that way; or if the user of the DVD video recorder described below made such editing).

When selecting an angle,
There are the following: That is, in the case of non-seamless playback in which the angle changes back to the beginning of the same scene and discontinuous in time (for example, the scene at the moment when the boxer puts the counter punch, the camera angle changes to another angle and the counter starts to be launched again. In the case of seamless playback in which the angle changes in the scene that follows the scene, and in the case of continuous seamless playback (for example, when the boxer enters the counter and the punch enters, the camera angle changes to another angle and the counter is eaten) When the opponent's flying scene is played continuously in time)
There is.

The video pack 88 includes a pack header 881
And a video packet 882. The sub-picture pack 90 includes a pack header 901 and a sub-picture packet 902. The audio pack 91 includes a pack header 911 and an audio packet 912.

Next, an information recording / reproducing apparatus for recording digital video data (recording at a variable recording rate) on the optical disk described above and reproducing digital video data recorded on the optical disk will be described with reference to FIG. I do.

FIG. 3 is a block diagram showing a schematic configuration of mainly a reproducing system of the information recording / reproducing apparatus.

As shown in FIG. 3, the information recording / reproducing apparatus
Reproduction unit 1, 3D noise reduction processing unit (3DN
R) 2, a storage unit (EEPROM) 3, a control unit 4, a remote control signal receiving unit 5, and a remote control 6.

The reproducing section 1 is provided with a semiconductor laser (not shown). The semiconductor laser irradiates an optical disk with a light beam for reproduction and a light beam for recording. Further, the reproducing unit 1 is provided with a photodetector (not shown). The photodetector detects the reflected light from the optical disc of the reproducing light beam emitted from the semiconductor laser, and outputs information (video signal) of the optical disc reflected on the reflected light. The video signal output from the photodetector of the reproducing unit 1 is supplied to the three-dimensional noise reduction processing unit 2.

The remote controller 6 has a 3DNR for setting (changing) a noise reduction level (filter characteristic).
A key 6a is provided. Every time the 3DNR key 6a is pressed once, noise reduction ON (weak) → noise reduction ON (strong) → noise reduction OFF
It switches in the order of. Further, the noise reduction level can be finely adjusted by a plus (+) key 6b and a minus (-) key 6c provided on the remote controller 6. If the plus key 6b is kept pressed while the noise reduction is ON (weak), the noise reduction level gradually approaches “strong”. Further, if the minus key 6c is kept depressed while the noise reduction is ON (strong), the noise reduction level gradually becomes "weak".
Approach.

Here, the noise reduction processing when a predetermined optical disc is reproduced will be described. It is assumed that a predetermined optical disc is reproduced by the information recording / reproducing apparatus shown in FIG. That is, the data recorded on the predetermined optical disk is read by the reproducing unit 1. At this time,
The sector number (End) of the end sector of the data area DA recorded in the lead-in area of this predetermined optical disc
The video manager end address VMG_EA included in the video manager information management table VMGI_MAT of the video manager information VMGI of the data area DA is read. The data read here, that is, the sector number of the end sector of the data area DA and the video manager end address VMG_EA are stored in the storage unit 3 as disc identification information. As described above, both of these data are gusset for each disc.
Therefore, a disc can be specified by a combination of these two data. That is, these two pieces of data can be combined into disk identification data.

Of the data read by the reproducing unit 1,
The video signal is supplied to the three-dimensional noise reduction processing unit 2. At this time, when the noise reduction level is set by the remote controller 6, based on the set noise reduction level, the three-dimensional noise reduction processing unit 2
Performs a noise reduction process. Strictly speaking, the signal of the noise reduction level set by the remote control 6 is received by the remote control signal receiving unit 5,
It is stored in the storage unit 3. At this time, the disc identification data and the noise reduction level are stored in association with each other. Then, the three-dimensional noise reduction processing unit 2 performs the noise reduction processing based on the noise reduction level stored in the storage unit 3. Then, the three-dimensional noise reduction processing unit 2 outputs the video signal after the noise reduction processing.

Thereafter, when the predetermined optical disk is reproduced again by the information recording / reproducing apparatus, the reproduction reads the disk identification data from the predetermined optical disk.
At this time, the read disk identification data and the storage unit 3
Will match with the disc identification data stored in. When a match is detected, a noise reduction process is performed by the noise reduction processing unit 2 based on the noise reduction level stored in association with the disc identification data stored in the storage unit 3. A series of controls at this time are performed by the control unit 4.

As described above, the noise reduction level once set is stored in association with the disc identification information. Therefore, when the disc is reproduced again, the noise reduction processing is performed based on the previously set noise reduction level. This allows
The user is released from troublesome setting of the noise reduction level. Also, if the optical disc to be played is a ROM
In the case of a RAM disk instead of a disk, the noise reduction level may be stored on the disk side.

In the above description, the case where the noise reduction level is stored for each disk has been described. However, the noise reduction level can be stored for each finer unit. For example, as described with reference to FIGS. Shows video data recorded in units of a video title set VTS. For example, one video title set VTS corresponds to one chapter. More specifically, the video title set VTS includes a plurality of cells. Then, a program chain PGC is constituted by a group of the plurality of cells. The image quality characteristics are expressed in units of the video title set VTS or in the program chain PG.
It often changes in units of C. Therefore, the unit of the video title set VTS, or the program chain PGC
, The noise reduction level may be stored.

More specifically, the disc identification data, the identification data of the video title set VTS, and the noise reduction level are stored in association with each other. Alternatively, the disk identification data, the identification data of the program chain PGC, and the noise reduction level are stored in association with each other. The identification data of the video title set VTS indicates a video title set number included in the video title set information VTSI. The identification data of the program chain PGC indicates a program number included in the program chain program map PGC_PGMAP of the program chain information PGCI.

Once the disk identification data, the identification data of the video title set VTS, and the noise reduction level are stored in association with each other, the disk corresponds to the stored disk identification data, and the stored disk identification data is stored. When the video title set VTS corresponding to the identification data of the video title set VTS is reproduced, the noise reduction processing is performed based on the stored noise reduction level. Discrimination of a disc and determination of a video title set are performed by the control unit 4, and under the control of the control unit 4, a noise reduction process based on a previously set noise reduction level is executed. Thereby, the user is released from troublesome setting of the noise reduction level for each video title set VTS. If the optical disc to be reproduced is not a ROM disc but a RAM disc, a noise reduction level for each video title set VTS may be stored on the disc side.

Further, once the disk identification data, the identification data of the program chain PGC, and the noise reduction level are stored in association with each other, the disk corresponds to the stored disk identification data, and the stored disk identification data is stored. When a program chain PGC corresponding to the identification data of the program chain PGC is reproduced, noise reduction processing is performed based on the stored noise reduction level. The discrimination of the disc and the discrimination of the program chain PGC are performed by the control unit 4, and under the control of the control unit 4, the noise reduction processing based on the previously set noise reduction level is executed. Thereby, the user is released from troublesome setting of the noise reduction level for each program chain PGC. If the optical disk to be reproduced is not a ROM disk but a RAM disk, the disk may store the noise reduction level for each program chain PGC.

[0059]

According to the present invention, it is possible to provide an information reproducing apparatus capable of reducing the burden on the user when functioning noise reduction and functioning noise reduction according to the situation.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a data structure of an optical disc applied to an information recording / reproducing apparatus according to the present invention.

FIG. 2 is a diagram showing a part of the data structure shown in FIG. 1 in more detail;

FIG. 3 is a block diagram showing a schematic configuration mainly of a reproducing system of the information recording / reproducing apparatus according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Playback part 2 ... Noise reduction processing part (3DNR) 3 ... Storage part (EEPROM) 4 ... Control part 5 ... Remote control signal receiving part 6 ... Remote control 6a ... 3DNR key 6b ... Plus key 6c ... Minus key

Claims (3)

[Claims] A reproducing means for reproducing an information recording medium on which identification information is recorded; a setting means for setting a noise reduction level for reducing noise included in a reproduction signal reproduced by the reproducing means; And a noise reduction unit configured to reduce noise included in the reproduction signal based on the noise reduction level set by the predetermined noise reduction level set by the setting unit. In the case of an information recording medium, a storage unit that stores the identification information of the predetermined information recording medium and the predetermined noise reduction level in association with each other, and a reproduction target by the reproduction unit is the identification information stored in the storage unit. In the case of the corresponding predetermined information recording medium, based on the predetermined noise reduction level stored in association with the identification information, An information reproducing apparatus comprising: a control unit configured to reduce noise included in a reproduction signal reproduced from the predetermined information recording medium by the noise reduction unit. 2. A reproducing means for reproducing an information recording medium on which a plurality of video data blocks are recorded; a setting means for setting a noise reduction level for reducing noise included in a reproduced signal reproduced by the reproducing means; A noise reduction unit configured to reduce noise included in the reproduction signal based on the noise reduction level set by the setting unit; and a noise reduction target by the noise reduction unit based on a predetermined noise reduction level set by the setting unit. Is a predetermined video data block, a storage unit for storing identification information for identifying the predetermined video data block and the predetermined noise reduction level in association with each other, and a reproduction target by the reproduction unit is stored in the storage unit. In the case of the predetermined video data block corresponding to the identified information, And control means for reducing noise included in a reproduction signal reproduced from the predetermined video data block by the noise reduction means based on the predetermined noise reduction level stored in addition. Information playback device. 3. A reproducing means for reproducing an information recording medium on which medium identification information is recorded and a plurality of video data blocks corresponding to a predetermined story including moving image data, still image data, and audio data are recorded, Setting means for setting a noise reduction level for reducing noise included in the reproduction signal reproduced by the reproduction means; and noise reduction for reducing noise included in the reproduction signal based on the noise reduction level set by the setting means And a medium identification of the predetermined information recording medium when the object of noise reduction by the noise reduction means is a predetermined video data block of a predetermined information recording medium based on a predetermined noise reduction level set by the setting means. Information, video data identification information identifying this predetermined video data block, and the predetermined Storage means for storing the size reduction levels in association with each other, wherein the reproduction target by the reproduction means is the predetermined information recording medium corresponding to the medium identification information stored in the storage means, and corresponds to the video data identification information. The predetermined video data block to be reproduced from the predetermined video data block of the predetermined information recording medium based on the predetermined noise reduction level stored in association with the medium identification information and the video data identification information. Control means for reducing noise included in the reproduced signal to be performed by the noise reduction means.