JP3872421B2 - Information recording medium, reproducing apparatus and reproducing method thereof - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an information recording medium such as a high-density optical disc capable of recording information such as video and audio represented by a DVD at a high density, and a reproducing apparatus and a reproducing method for reproducing information from the information recording medium.
[0002]
[Prior art]
As optical discs on which information such as video and audio is recorded, so-called LD (Laser Disc), CD (Compact Disc) and the like are widely used. However, in LD or the like, it has been impossible to perform a playback mode rich in so-called interactive change that a viewer has choices about video and audio to be played back and that the viewer selects. For example, when playing a foreign movie recorded on the LD, select whether the subtitles displayed on the screen will be in Japanese or English, and select whether to listen to the recorded audio in Japanese or English It is not possible.
[0003]
On the other hand, in recent years, proposals and developments on DVDs (Digital Video Discs or Digital Versatile Discs) in which the storage capacity has been improved about 10 times without changing the size of the optical discs relative to the CDs have been actively conducted. By recording the reproduction control information along with the subtitles and sounds in the plurality of languages on the DVD, it is possible to perform reproduction rich in interactive changes by making the viewer selectable.
[0004]
[Problems to be solved by the invention]
Since DVD has a large storage capacity, not only video information or music information but also music and video information can be recorded simultaneously. In order to realize various reproduction modes that are interactive and varied with respect to the video information and music information (hereinafter referred to as entity information), reproduction control information indicating a reproduction procedure of the entity information is also recorded.
[0005]
This reproduction control information is recorded on the disc so as to form a hierarchical structure in order to realize various and complicated functions with a simpler structure. Further, the reproduction control information is recorded in a distributed manner on the disc for each entity information having a certain unit according to the hierarchical structure. In the DVD video format, a very large number of functions can be realized due to its interactivity, and various reproduction modes can be presented to the user. Therefore, the reproduction control information must be complicated. This playback control information is premised on a player that can realize all the playback modes (functions) prepared.
[0006]
However, for example, in a DVD player dedicated to audio reproduction, when only audio information in video information recorded on a DVD is to be reproduced (for example, only audio information is reproduced from a DVD containing a live performance of a singer) The reproduction control information includes a lot of unnecessary information. Since a DVD player dedicated to audio reproduction does not need to reproduce video information, reproduction control information necessary for interactive reproduction of video such as subtitles and multi-angles is unnecessary.
[0007]
Even in the case of a DVD player dedicated to audio reproduction, various information for realizing various reproduction modes is prepared in the reproduction control information even if only audio information is reproduced. For a simple player that only needs to reproduce linear PCM audio information in a 2ch stereo playback format among audio-only DVD players, only the information necessary for the 2ch stereo playback format is selected from the audio information playback control information. Processing to select occurs.
[0008]
Furthermore, since the reproduction control information and the entity information are distributed and arranged, for example, when trying to know the total reproduction time of the entire disc, it is necessary to collect and calculate various reproduction control information recorded in a distributed manner. In such a structure in which reproduction control information for realizing a complicated function more easily is distributed and recorded on the disc, complicated processing is required instead of grasping information on the entire disc collectively. Also occurs.
[0009]
The present invention has been made in view of the above points, and the problem is that various and complex functions can be realized, and reproduction can be performed by simpler processing when a limited part of the functions is realized. It is an object of the present invention to provide an information recording medium, a reproducing apparatus and a reproducing method thereof.
[0010]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a recording medium having a video area for recording AV information mainly including video information and audio information accompanying the video information, and an audio area for mainly recording audio information. Navigation information for a video player capable of reproducing video, navigation information for an audio player capable of reproducing audio information in the video area and audio information in the audio area, audio information in the video area, and the audio area Navigation information for a simple audio player for reproducing the audio information by a simple audio player, and navigation information for a compatible player capable of reproducing both the AV information and the audio information.
[0011]
According to an eleventh aspect of the present invention, in the information reproducing apparatus for reproducing information from the recording medium according to the first aspect, the navigation information for the video player, the navigation information for the audio player, the navigation information for the simple audio player, and the compatible It comprises selection means for selecting any of the player navigation information, and reproduction means for reproducing the recorded information from the recording medium based on the selected navigation information.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0013]
(1) DVD video format
First, the recording format (physical recording format) of video information and audio information (including music information; the same applies hereinafter) on a video DVD will be described with reference to FIG.
[0014]
(1.1) Physical format
As shown in FIG. 1, the video DVD 1 has a lead-in area LI at its innermost peripheral part and a lead-out area LO at its outermost peripheral part, and is a volume space between the video information and audio. Information is divided and recorded in a plurality of VTSs (Video Title Set) 3 (VTS # 1 to VTS # n) each having an ID (identification) number. Here, the VTS is a related title (the number of audio information and sub-picture information included therein, the attributes such as the specification, the corresponding language, etc. are the same) titles (movies etc.) that the producer intends to present to the viewer. It is a set (group) of all the works.
[0015]
Immediately outside the lead-in area LI, a UDF (Universal Disk Format) 2 having information for managing the format of a file recorded in the disk is recorded, and subsequently a VMG (Video Manager) 3 is recorded. Information recorded as the VMG 3 includes, for example, video information recorded on the video DVD 1 such as a menu indicating selection items for the user, information for preventing illegal copying, or an access table for accessing each title. And management information related to the entire audio information.
[0016]
One VTS 4 is divided and recorded into a plurality of VOBs (Video OBjects) 10 each having an ID number starting from a VTSI (Video Title Set Information) 11. Here, a portion constituted by a plurality of VOBs 10 is referred to as a VOB set (VOBS).
[0017]
The VTSI 11 recorded at the head of the VTS 4 includes PGCI (Program as Program Control Information) which is various information related to the program chain, which is a logical division combining a plurality of cells (cells will be described later). Information such as “Chain Information” is recorded. In addition, each VOB 10 is recorded with substantial parts of video information and audio information.
[0018]
One VOB 10 is composed of a plurality of cells 20 each having an ID number. One cell 20 includes a plurality of VOB units (VOBU) 30 each having an ID number. Here, the VOBU 30 is one unit constituted by any one of video information, audio information, sub-video information (referring to sub-video information such as subtitles in a movie) or only a navigation pack described later.
[0019]
One VOBU 30 includes a navigation pack 41 in which control information for controlling video information included in the VOBU 30 is stored, a video pack 42 including video data as video information, and audio data as audio information. An audio pack 43 and a sub-picture pack 44 including sub-picture data as sub-picture information are configured. Here, only video data is recorded as video data, and only audio data is recorded as audio data. In addition, as sub-picture data, only graphic data such as characters and figures as sub-pictures is recorded.
[0020]
In the pack header recorded at the head of each pack P, the data included in each pack P is read from a track buffer in a playback apparatus to be described later and input to each buffer is started on the playback time axis. Read start time information called SCR (System Clock Reference) indicating the read start time, a start code indicating the start of the pack P, and the like are recorded.
[0021]
The navigation pack 41 is search information (specifically, an address or the like on the DVD 1 in which the video or audio to be reproduced / displayed is recorded) for searching for the video or audio or the like to be reproduced / displayed. Data Search Information) data 51 and PCI (Presentation Control Information) data 50, which is information related to playback display control when video or audio searched based on the DSI data 51 is played back and displayed.
[0022]
All the video packs 42 included in one VOBU 30 are configured by one or a plurality of GOPs (Group Of Pictures). The GOP is the smallest that can be reproduced independently, as defined in the MPEG2 (Moving Picture Experts Group 2) standard, which is an image compression method employed when recording video information on the DVD 1 in the present embodiment. It is an image unit.
[0023]
In the hierarchical recording format shown in FIG. 1 described above, each category is freely set by the producer of recording information to be recorded in the DVD 1 (hereinafter simply referred to as the producer) according to the intention. To be recorded. By performing reproduction based on the logical structure described later for each of these sections, various reproductions with various changes are possible.
[0024]
(1.2) Logical format
Next, a logical format (logical structure) in which information recorded by the physical division shown in FIG. 1 is combined will be described with reference to FIG. Note that the logical structure shown in FIG. 2 does not actually record information on the DVD 1 in that structure, but reproduces the data shown in FIG. 1 (especially cell 20) in combination with the logical structure shown in FIG. Playback control information (access information or time information) for recording is recorded on the DVD 1, particularly in the VTSI 11.
[0025]
For convenience of explanation, starting from the lower hierarchy in FIG. 2, one program 60 is logically configured by selecting and combining a plurality of cells 20 in the physical structure described in FIG. . Note that the producer can also define the program 60 as a minimum unit in which one or a plurality of programs 60 can be freely selected and viewed by the viewer, and this unit is referred to as a PTT (Part of Title). Here, the number of one cell 20 is handled as a cell ID number when the cell 20 is handled in the physical format shown in FIG. 1 (shown as cell ID # in FIG. 1), and is shown in FIG. When handled in the logical format, they are handled as cell numbers in the order of description in PGCI described later.
[0026]
A plurality of programs 60 are combined to logically configure one PGC (Program Chain) 61. The above-described PGCI is defined in units of the PGC 61, and in the PGCI, the reproduction order of the cells 20 for each program 60 when the respective programs 60 are reproduced (the program unique to each program 60 by this reproduction order). A number is assigned.), An address which is a recording position on the DVD 1 of each cell 20, a number of the first cell 20 to be reproduced in one program 60, and the like.
[0027]
In one PGC 61, in addition to the PGCI, data such as substantial video and audio is included as a combination of programs 60 (in other words, as a combination of cells 20). One title 62 is logically configured by one or a plurality of PGCs 61. The title 62 is, for example, a unit corresponding to one movie in terms of video information, and is complete information provided to the viewer of the DVD 1 by the producer. One or more titles 62 logically constitute one VTS 63.
[0028]
The information corresponding to one VTS 63 shown in FIG. 2 corresponds to the information included in one VTS 4 shown in FIG. That is, all information logically included in the VTS 63 shown in FIG. 2 is recorded on the DVD 1 as a single VTS 4.
[0029]
Based on the logical format described above, the producer specifies the information divided in the physical structure, so that the video or music that the viewer should watch is formed.
[0030]
(2) DVD audio format
Next, a recording format (physical recording format) of audio information (including music and audio information; the same applies hereinafter) on an audio DVD will be described with reference to FIG.
[0031]
(2.1) Physical format
First, the physical format (physical recording format) on the audio DVD will be described with reference to FIG.
[0032]
First, as shown in FIG. 3, the audio DVD 200 according to the embodiment has a lead-in area LI at the innermost peripheral portion and a lead-out area LO at the outermost peripheral portion. It has become. In this, an audio zone is always recorded. In this audio zone, audio information is divided and recorded in a plurality of ATSs (Audio Title Set) 203 (ATS # 1 to ATS # n) each having an ID (identification) number.
[0033]
Immediately outside the lead-in area LI, a UDF (Universal Disk Format) 201 having information for managing the format of a file recorded in the disc is recorded, and subsequently, SAPPT as second playback control information is recorded. (Simple Audio Part Table) 204 is recorded. This SAPPT is recorded on a DVD disc having an audio zone. In FIG. 3, the SAPPT is recorded at the head position of the audio zone. However, the present invention is not limited to this, and the SAPPT may be recorded in the lead-in area LI or in the AMG 202.
[0034]
Subsequently, an AMG (Audio Manager) 202 is recorded. Information recorded as the AMG 202 is recorded on the audio DVD 200 such as a menu for prompting the user to select an item, information for preventing illegal copying, or an access table for accessing each title. This is management information related to the entire audio information.
[0035]
One ATS 203 is composed of a plurality of AOBs (Audio Objects) 210 each having an ID number with an ATSI (Audio Title Set Information) 211 as the head. Here, a part constituted by a plurality of AOBs 210 is referred to as an AOB set (AOBS). This AOB set is a substantial part of audio information.
[0036]
The ATSI 211 recorded at the head of the ATS 203 contains APGCI (Audio as the first reproduction control information, which is various information related to the program chain, which is a logical division combining a plurality of cells (cells will be described later). Information such as Program Chain Information) is recorded. Each AOB 210 records the actual part of the audio information. One AOB 210 includes a plurality of cells 220 each having an ID number.
[0037]
One cell 220 is composed of a plurality of packed audio packs 230 or an audio pack and a real time information pack 231. The audio pack 230 is a pack of audio information to be recorded on an audio DVD for each predetermined size, and includes audio information digitized by, for example, linear PCM. The real-time information pack 231 includes text information, BPM (Beat Per Minutes), beat information, and the like.
[0038]
In the recording format having the hierarchical structure shown in FIG. 3 described above, each category is freely set by a producer of recording information to be recorded in the audio DVD 200 (hereinafter simply referred to as a producer) according to the intention. Can be recorded. By performing reproduction based on the logical structure described later for each of these sections, various reproductions with various changes are possible.
[0039]
(2.2) Logical format
Next, a logical format (logical structure) in which information recorded by the physical division shown in FIG. 3 is combined will be described with reference to FIG. Note that the logical structure shown in FIG. 4 does not actually record information on the audio DVD 200 in that structure. Audio information is recorded in the physical format shown in FIG. 3 on the audio DVD, and information for reproducing the audio information is recorded in the above-described AMG 202 and ATSI 211 in the logical format shown in FIG. is there.
[0040]
For the sake of convenience of explanation, starting from the lower hierarchy of FIG. 4, the index 259 is configured by selecting and combining one cell or a plurality of cells 220 from the physical structure described in FIG. The index can also be used as a song number and is the smallest unit accessible by the user.
[0041]
One track 260 is logically constituted by one or a plurality of indexes 259. The track 260 is an information unit corresponding to one song. The user can select an arbitrary track (song) and directly access it. Here, the number of one cell 220 is handled as a cell ID number (indicated as cell ID # in FIG. 3) when the cell 220 is handled in the physical format shown in FIG. 3, and the logic shown in FIG. When handled in the format, the cell numbers are handled in the order of description in APGCI described later.
[0042]
A track 260 (song) is an information unit including a plurality of cells, and is a set of cells having certain common attributes. That is, the attributes of all the cells in the track are all the same. All cells included in a track are recorded adjacent to each other in the same object.
[0043]
One title 261 is logically configured by combining one or a plurality of tracks 260. However, the title itself is not recognized by the user as an access unit. Therefore, it is impossible to specify a title number and access an arbitrary title.
[0044]
In the DVD audio format, the attribute of each track 260 constituting the title 261 can be defined independently in a maximum of 8 patterns. That is, for each track (song), attributes as audio information such as the number of channels, a quantization method, and a sampling frequency may be changed.
[0045]
The APGCI described above is defined in units of the title 261. The APGCI includes the attribute of each track, the reproduction order of the cells 220 for each track 260 when reproducing each track 260, and the audio of each cell 220. The address which is the recording position on the DVD 200, the number of the first cell 220 to be reproduced in one track 260, the reproduction method of each track 260 and various commands are included.
[0046]
In one title 261, in addition to the above APGCI, substantial audio information is included as a combination of tracks (songs) 260 (in other words, as a combination of cells 220).
[0047]
One title group 262 is logically configured by one or a plurality of titles 261. Also, the title group 262 is the maximum unit that can be accessed by the user, and a maximum of nine title groups can be defined in one volume. The title group 262 includes one or a plurality of titles 261 that are collected based on a certain relationship, and all the titles in the title group are continuously played back. For example, a collection of songs by a singer or composer can be assembled as one title group.
[0048]
One or more title groups 262 logically constitute one volume 263. The volume 263 is an information unit corresponding to one album (DVD). The actual audio information included in one title shown in FIG. 4 is recorded in any one ATS 203 shown in FIG. 3 on the audio DVD.
[0049]
Based on the logical format described above, the music specified by the producer is specified by the producer, thereby forming music that the viewer listens to.
[0050]
(3) Types of DVD
Next, the type of disc in the DVD will be described. In the following description, regarding information recorded on a DVD, information including both video and audio, such as a movie, may be referred to as “AV information”, and information of only the video portion is referred to as “video ( (Or video) information ”. Also, only audio part of AV information such as movies and only audio information such as music is called “audio (or voice) information”.
[0051]
Further, as a DVD player for reproducing these various DVD discs, a video DVD player capable of reproducing AV information in the DVD video format (hereinafter referred to as “video player”), and various audio information in the DVD audio format are used. An audio DVD player (hereinafter referred to as “audio player”) that is played in a playback mode, a simple audio DVD player (hereinafter referred to as “simple audio player”) that reproduces LPCM audio information in the DVD audio format in 2ch, and There are four types of compatible DVD players (hereinafter referred to as “compatible players”) that can reproduce both AV information in DVD video format and audio information in DVD audio format. Each DVD player will be described in detail later.
[0052]
There are four types of DVDs for recording AV information or audio information: video DVDs, video DVDs with audio navigation, audio-only DVDs, and audio / video DVDs. FIG. 5 schematically shows physical formats of four types of DVDs. These DVDs all have the same disk shape and information recording method (modulation method, track pitch, pit size, etc.), and only the information content (content) is different.
[0053]
(3.1) Video DVD
In FIG. 5, a video DVD is shown at the top. On this disc, video information such as a movie according to the DVD video format and audio information (that is, AV information) reproduced at the same time are recorded. Accordingly, only the video zone exists in the recording area between the lead-in area LI and the lead-out area LO, and playback control information, video information, and audio information are recorded in a plurality of VTSs, and management of these VTSs is performed. A VMG including information is recorded. As described with reference to FIG. 1, video information is recorded as a video pack, and audio information is recorded as an audio pack.
[0054]
This video DVD is reproduced by a video player and a compatible player based on navigation information (information defining control information for reproduction, which will be described in detail later) included in the management information recorded in the VMG. The However, since navigation information in the DVD audio format is not recorded, it cannot be reproduced by an audio player.
[0055]
(3.2) Video DVD with audio navigation
The second level shows a type of video disc called a video DVD with audio navigation. This video DVD with audio navigation can reproduce video information (including accompanying audio information) such as a movie in a DVD video format by a video player, and also records navigation information in a DVD audio format. This is a disc that allows a player to reproduce only audio information of AV information of VOB in VTS. A portion of AV information in which only audio information can be reproduced by an audio player is called an audio play part.
[0056]
The recording format of the video DVD with audio navigation is based on the DVD video format shown in FIG. 1, and AV information is recorded in the video zone in the form of a plurality of VTSs. In addition to this, the video DVD with audio navigation has an ATSI including first reproduction control information necessary for reproducing only audio information in the VTS conforming to the DVD audio format in front of the video zone as an audio zone. ATS is recorded, and AMG as ATS management information is recorded. AOB, which is a substantial part of audio information, is not recorded in ATS. That is, in this AMG and ATSI, the audio information (specifically, the audio play part audio pack (see FIG. 1) in each VOB) included in each VTS in the video DVD with audio navigation is reproduced by the audio player. Navigation information is described. SAPPT including the second reproduction control information is recorded at the head of the audio zone.
[0057]
This video DVD with audio navigation is reproduced by a video player and a compatible player based on the navigation information recorded in the VMG and the first reproduction control information recorded in the VTSI. Also, the audio information of the audio play part is played back in various playback modes in accordance with the player's ability based on the navigation information recorded in the AMG and the first playback control information recorded in the ATSI. . Further, the LPCM information of the audio play part is reproduced in 2ch by a portable type simple audio player based on the management information and the second reproduction control information recorded in the SAPPT.
[0058]
(3.3) Audio-only DVD
The third level shows an audio-only DVD. Only audio information is recorded on this disc except for some still images and text information. Therefore, the recording area between the lead-in area LI and the lead-out area LO has only an audio zone compliant with the DVD audio format, and ATSI and AOB are recorded as a plurality of ATSs, and management information of these ATSs is recorded. Contains AMG. Furthermore, SAPPT is recorded at the head of the audio zone.
[0059]
Each ATS includes one or a plurality of AOBs that are the substantial part of the audio information. This audio-only DVD is an audio player and a compatible player based on the navigation information recorded in the AMG and the first playback control information recorded in the ATSI. It is played back in playback mode. Further, LPCM information in the audio zone is reproduced in 2ch by a portable audio player based on the management information and the second reproduction control information recorded in SAPPT.
[0060]
However, since navigation information in the DVD video format is not recorded on the audio-only DVD, it cannot be reproduced by a video player.
[0061]
(3.4) DVD for audio and video
What is shown at the bottom of FIG. 5 is an audio / video DVD. There are an audio zone and a video zone between the lead-in area LI and the lead-out LO. Similar to a video DVD, a VTS including a VMG according to a DVD video format, first reproduction control information, and actual AV information (VOB) is recorded in the video zone.
[0062]
SAPPT including second reproduction control information is recorded at the head of the audio zone according to the DVD audio format. Similar to the audio-only DVD, the audio zone not only records a plurality of ATSs (ATS # 1, # 2 in the figure) including playback control information and actual audio information, but also the audio in the VTS of the video zone. ATS (ATS # 3 in the figure) including only reproduction control information for reproducing only audio information of VOB as a play part is also recorded. That is, in the audio / video DVD, the AV information in the DVD video format and the audio information in the DVD audio format are recorded in different areas.
[0063]
In the case of a DVD for both audio and video, the AMG not only includes management information for all ATSs in the audio zone, but also includes management information that includes all ATSs and VTSs in the audio zone and video zone. The SAPPT also includes management information including all ATSs and VTSs in the audio zone and the video zone. However, the management information in the SAPPT is only related to LPCM data that can be reproduced by 2ch in both zones.
[0064]
Here, the audio / video dual-use DVD is different from a video disc with audio navigation and an audio-only DVD in that the recording area of the disc is divided into an audio zone and a video zone, respectively, depending on the AV information by the DVD video format and the DVD audio format. The audio information is recorded, and the AMG and SAPPT recorded in the audio zone include management information including all ATSs and VTSs in the disc.
[0065]
More specifically, in a video disc with audio navigation, audio information is recorded in a VOB multiplexed with video information in units of packs based on the DVD video format. APGCI, which is first reproduction control information for reproducing audio information recorded in the VOB, is configured as ATSI, and only these ATSs are managed by AMG. No title management information in the video zone is recorded in the AMG. Similarly, navigation information related to the audio play part in the video zone is also described in SAPPT.
[0066]
In contrast, an audio / video DVD has separate areas for recording audio information in the DVD audio format and AV information in the DVD video format. In the audio zone, the actual part of the audio information is recorded in each ATS as a plurality of AOBs by the DVD audio format shown in FIG. Furthermore, not only the ATS in which APGCI, which is the playback control information of the audio information in each ATS, is recorded in the ATSI, but also the first playback control information for playing back the audio information recorded in the VOB in the VTS of the video zone. Are recorded in the ATSI as APGCI (the audio substance information is in the video zone, and only the ATSI as the navigation information exists as the ATS). That is, all the first reproduction control information for reproducing the audio information regardless of the zone is managed by the AMG in the ATS.
[0067]
Furthermore, information related to a track that can be played back by 2ch among the tracks related to playback of LPCM audio information recorded in all ATSs and VTSs is recorded in SAPPT as second playback control information.
[0068]
On the other hand, in the video zone, AV information is recorded as a plurality of VTSs, and further, the first playback control information for reproducing the AV information in each VTS is recorded as PGCI in VTSI, and all these VTSs are recorded in VMG. I manage. AMG also manages all of the first playback control information related to AV information playback in the video zone. Specifically, in the case of an audio-only DVD and an audio / video DVD, AMG is general management information, and in the case of a video DVD, VMG is main management information. In the case of a video DVD with audio navigation, AMG manages only reproduction of audio information (audio title) in the VOB by the audio player, and does not manage video titles.
[0069]
In the case of an audio-only DVD and an audio / video DVD, SAPPT is comprehensive management information for reproducing LPCM audio information in 2ch by a simple audio player. In the case of a video DVD, since there is no SAPPT, even if it is recorded in LPCM, only audio information is not reproduced by a simple player. In the case of a video DVD with audio navigation, SAPPT manages only the reproduction of LPCM audio information (audio title) of the audio play part in the VOB by the simple audio player, and does not manage the video title.
[0070]
By adopting such a structure, optimum reproduction can be performed according to the capability of the reproducing apparatus, and compatibility compatible between each disk and each reproducing apparatus is realized.
[0071]
(4) Title playback control
Next, the playback control of the title using the first playback control information will be described in more detail. Here, the title is composed of entity information such as AV information and audio information recorded on the DVD and playback control information indicating the playback procedure (see title 62 in FIG. 2 and title 261 in FIG. 4). , Refers to a series of works (presentation) or a part of a work in common reproduction form. Therefore, the title in the DVD audio format and the playback control of the title will be described using an audio / video dual-use disc as an example.
[0072]
(4.1) Title type
First, a title in the audio DVD (title 261 in FIG. 4) is an audio title (hereinafter also referred to as “AOTT (Audio Only TiTle)”) formed by reproducing audio information in the audio zone, and AV information in the video zone. And video titles configured by playback. There are two types of video titles: an image-only title (hereinafter also referred to as “AVTT (Audio Video TiTle)”) and a video / audio dual-purpose title (hereinafter also referred to as “AVTT / AOTT”). being classified. In the case of the DVD video format, only an image-only title (AVTT) is used.
[0073]
AOTT is a title in which only audio information is reproduced, and its entity information is composed of audio information recorded in the AOB in the audio zone.
[0074]
AVTT is a title in which audio information is always reproduced with video information, and its entity information is composed of AV information recorded in a VOB in the video zone. In AVTT, reproduction of only audio information is not permitted, and reproduction with video information is essential.
[0075]
AVTT / AOTT is a title that can be played back only with audio information, and can also play back audio information along with video information as AV information (that is, it can be called a dual-purpose title). Is composed of AV information recorded in the VOB in the video zone. Whether the AVTT / AOTT is reproduced as AV information or audio information depends on the capability of the reproducing apparatus. That is, a playback device (audio player) that does not have AV information playback capability plays back AVTT / AOTT using only audio information, and a playback device (video player and compatible player) that has AV information playback capability plays back AVTT / AOTT. Play with audio information along with the information.
[0076]
By the way, the navigation information for the audio player and the navigation information for the compatible player are separately recorded in the AMG. The navigation information for the audio player is navigation for reproducing only the audio information of the audio title (AOTT) composed of the audio information in the AOB of the audio zone and the dual-purpose title composed of the AV information in the VOB of the video zone. This is an audio title search pointer that describes information, and is recorded in the audio only title search pointer table (AOTT_SRPT). An audio title search pointer that is navigation information for a compatible player capable of reproducing all types of titles is recorded in the audio title search pointer table (ATT_SRPT). Such navigation information will be further described in detail with reference to FIG.
[0077]
When the audio / video DVD is played back by the video player, each of the video player navigation information recorded in the VMG in the video zone and the first playback control information PGCI recorded in the VTSI are used. Play back AV information in VTS. When the audio / video DVD is reproduced by an audio player, AOTT_SRPT in the AMG in the audio zone is referred to in accordance with APGCI which is the first reproduction control information for the audio player recorded in the ATSI. Play audio information. There are two cases in which audio information is reproduced by an audio player. One is a case where an audio title (AOTT) is reproduced, and audio information in the AOB is reproduced according to APGCI which is navigation information of the AMG in the audio zone and first reproduction control information recorded in the ATSI. Is the case. The other is a case where an audio / video title (AVTT / AOTT) is played back, as in the case of a video disc with audio navigation, the AMG navigation information in the audio zone and the first playback recorded in the ATSI. This is a case where audio information recorded in the VTS in the video zone is reproduced according to APGCI which is control information. In the latter case, for the same object, the video player reproduces AV information with an image, and the audio player reproduces only the audio information.
[0078]
Furthermore, when this audio / video DVD is played back by a compatible player, ATT_SRPT, which is navigation information for the compatible player in the AMG in the audio zone, is referred to according to the playback control information recorded in the ATSI and VTSI. The audio information in the audio zone and the AV information in the video zone are reproduced in an integrated manner. All titles in the audio / video DVD are managed by the AMG, and are classified into one of the above three types of titles in the DVD audio format.
[0079]
Consider a case where an audio / video DVD having the logical format example shown in FIG. 6 is played back using a compatible player having both DVD audio format and DVD video format playback capabilities. In this audio / video DVD, the volume is composed of seven title groups # 1 to # 7, and each title group is composed of one title. One title includes one or a plurality of tracks. In FIG. 6, the left column shows navigation information for compatible players (ATT_SRPT), the center column shows navigation information for video players (TT_SRPT), and the right column shows navigation information for audio players (AOTT_SRPT). Is.
[0080]
Since titles # 2 and # 5 are AOTTs, only the audio information recorded in the AOB in the audio zone of the audio / video DVD is reproduced when these titles are reproduced. Since titles # 4, # 6, and # 7 are AVTT, AV information recorded in the VOB in the video zone of the audio / video DVD is reproduced. Therefore, video and audio are always reproduced. Since titles # 1 and # 3 are AVTT / AOTT, the compatible player reproduces both audio and video based on the video and audio information recorded in the VOB in the video zone of the DVD for both audio and video.
[0081]
When an audio player that does not have video information playback capability is used, only the audio information recorded in the VOB in the video zone of the audio / video DVD is played back in titles # 1 and # 3 (FIG. 6). (See right column). That is, the AVTT / AOTT title is created so as to reproduce the recorded information by a method capable of maximizing the capability according to the capability of the reproducing device that is intended to reproduce the DVD disc.
[0082]
In order to eliminate the confusion at the time of title group reproduction, it is promised that AVTT cannot form a title group with other types of titles (AOTT, AVTT / AOTT).
[0083]
(4.2) Double management of VOB
Next, the concept of PGCI and APGCI defined for VOB in the video zone of the audio / video DVD will be described. In the VOB, video data and audio data are recorded in a multiplexed form. When VOB is reproduced as AV information, it is reproduced according to PGCI, which is the same concept as in the case of a video DVD. As described above, since the method of recording and reproducing AV information in the audio DVD is matched to the video format, compatibility with the video player is maintained. On the other hand, when only the audio information in the VOB is reproduced, the reproduction is performed according to APGCI. This APGCI is defined independently of PGCI. This will be described with reference to FIG.
[0084]
FIG. 7 shows the concept of a program when a certain VOB is played back as AV information in accordance with PGCI and when it is played back only as audio information in accordance with APGCI. In FIG. 7, VOB includes video data, sub-picture data, and audio data. When this VOB is reproduced as AV information, the reproduction control is performed based on PGCI. In PGCI, the VOB is divided into six video cells # 1 to # 6. The video program # 1 is divided by the video cell # 1, the video program # 2 is divided by the video cell # 2- # 4, and the video cell # 6 is divided. Video program # 3 is configured. When AV information is played back by a video player or a compatible player such as AVTT / AOTT, playback is performed according to such PGCI.
[0085]
On the other hand, when the audio player reproduces only the audio information from the same VOB, the reproduction is performed according to APGCI. Each audio program defined by APGCI is composed of one or more audio cells. Here, even for the same object (VOB), the audio cell can be defined (independently) different from the video cell (and of course, can be defined to match). That is, the start position and end position of each audio cell can be set independently of any video cell. Also, the playback order of audio cells defined by APGCI can be defined independently of the playback order of video cells defined by PGCI.
[0086]
In the example of FIG. 7, the audio program # 1 is composed of audio cells # 1 and # 2, and the audio program # 2 is composed of audio cell # 3. APGCI includes information such as the recording position and playback order of audio cells included in these audio programs, and audio information is played back based on the information.
[0087]
As described above, the reason why the audio cell can be defined independently of the video cell is to manage the audio information independently of the AV information. In this way, when only the audio information in the VOB is reproduced, time management or the like can be performed independently of the AV information, and only the audio information among the audio information included in the AV information is reproduced. However, it is possible to reproduce only a meaningful part, and of course, it may be defined as the same cell.
[0088]
(4.3) First playback control information
Next, reproduction control using the first reproduction control information for each of the above-mentioned titles in an audio / video DVD will be described with reference to FIGS. Here, the first reproduction control information refers to ATT_SRPT and AOTT_SRPT in AMG, TT_SRPT in VMG, APGCI in ATS, and PGCI in VTS.
[0089]
FIG. 8 shows an example of navigation information for an audio / video DVD. As described above, an audio / video DVD has a video zone according to the DVD video format and an audio zone according to the DVD audio format. Information reproducible from an audio / video DVD is AV information (video information with sound) such as a movie and audio information. Then, navigation information for preventing confusion and contradiction when each information is reproduced by various players is recorded on the audio / video DVD separately for each player.
[0090]
(4.3.1) AMG, ATSI, title search pointer table
In FIG. 8, an audio / video DVD has an audio zone and a video zone. The audio zone is composed of SAPPT204, AMG202, ATS # 1, ATS # 2, and ATS # 3. ATS # 1 is composed of ATSI211 and AOB210, and ATS # 3 is composed only of ATSI212. The video zone is composed of VMG3, VTS # 1, and VTS # 2, and VTS # 1 is composed of VTSI11 and VOB10.
[0091]
The AMG 202 includes an AMGI (AMG Information) 240 that is an actual part of navigation information. The AMGI 240 includes an AMGI management table 241 including information such as a file size and a recording address of the AMGI 240, an ATT search pointer table 242 and an AOTT search pointer table 243. Here, ATT is a generic term for an audio title (AOTT) composed only of audio information, an image-only title (AVTT) composed of AV information, and a video / audio mixed title (AVTT / AOTT) composed of AV information. is there.
[0092]
Here, the search pointer is a pointer indicating the recording position on the DVD of the reproduction control information (in this case, APGCI and PGCI) of each title. As described above, each title is composed of entity information such as audio information and AV information, and reproduction control information for reproducing the entity information in combination. This reproduction control information is recorded in ATSI in ATS or VTSI in VTS. The search pointer is a pointer indicating the recording position in the ATSI or VTSI of the reproduction control information for each title. The navigation information is information for managing the reproduction of each title, and is a concept including the search pointer in the present embodiment.
[0093]
The ATT search pointer table 242 is a table describing navigation information when each title of the audio / video DVD is reproduced by a compatible player. On the other hand, the AOTT search pointer table 243 is a table describing navigation information when each title of the audio / video DVD is reproduced by an audio player. Further, the ATT search pointer table 242 and the AOTT search pointer table 243 have a 1: 1 correspondence, and the number of search pointers described in the ATT search pointer table is the number of all titles included in the audio / video DVD. Matches the number. For example, as shown in FIG. 6, if a total of seven titles are included in the audio / video DVD, search pointers corresponding to the seven titles are described in the ATT search pointer table 242. Regardless of the type of title, the AOTT search pointer table 243 also has a frame for describing seven search pointers. The frame of each table corresponds to 1: 1.
[0094]
(4.3.1.1) ATT_SRP
The audio title search pointer (ATT_SRP) is navigation information used when an audio / video DVD is reproduced by a compatible player. Therefore, when an audio / video DVD is set, the compatible player refers to this ATT_SRP and plays back each title. The example of the navigation information shown in FIG. 8 corresponds to the example of the audio / video DVD shown in FIG. 6, where titles # 1 and # 2 are video / audio titles (AVTT / AOTT), titles # 2 and # 2. 5 is an audio title (AOTT), and titles # 4, # 6, and # 7 are image-only titles (AVTT).
As already described, three types of titles (AOTT, AVTT / AOTT, AVTT) can be recorded on an audio / video DVD. Therefore, in the audio / video DVD, search pointers for all three types of titles (AOTT, AVTT / AOTT, AVTT) are described in the AMG ATT search pointer table 242.
[0095]
However, the title search pointer 245 that is actually written in the ATT search pointer table 242 of FIG. 8 is only the audio title search pointer (AOTT_SRP) or the image dedicated title search pointer (AVTT_SRP), and the video / audio mixed title (AVTT / AOTT). The title search pointer for is described as an image-only title search pointer (AVTT_SRP) (the actual description is shown in parentheses in the table of FIG. 8). This is because it is not necessary for a compatible player to distinguish between an audio / video title (AVTT / AOTT) and an image-only title (AVTT). That is, the compatible player has the playback capability of the DVD video format, and all the audio / video titles are played back as video information, so there is no need to distinguish the navigation information from the title search pointer dedicated to the image (AVTT_SRP). is there. Therefore, all titles that accompany image reproduction are described in a common format as an image dedicated title search pointer (AVTT_SRP).
[0096]
Therefore, as can be seen by comparing the left column of FIG. 6 with the audio title search pointer table 245 of FIG. 8, the ATT search pointer table 242 describing the navigation information for the compatible player has the image-specific title (title # 4, 6). 7) and video / audio mixed titles (title # 1, 3) describe an image-only title search pointer (AVTT_SRP), and audio titles (title # 2, 5) describe an audio title search pointer (AOTT_SRP). The The compatible player refers to this table 242, and reproduces titles # 1, 3, 4, 6, and 7 as AV information and titles # 2 and # 5 as audio information, as shown in the left column of FIG. To do.
[0097]
(4.3.1.2) AOTT_SRP
The AOTT search pointer table 243 describes an audio title search pointer (AOTT_SRP) that is navigation information for an audio player. Therefore, when an audio / video DVD is set, the audio player performs reproduction with reference to the AOTT search pointer table 243.
[0098]
In this table, search pointers related to the audio title (AOTT) and the video / audio title (AVTT / AOTT) are described. Since the audio player does not have the ability to reproduce AV information, there is no need to describe a search pointer for an image-only title (AVTT). However, the only search pointer actually written in this table is the AOTT search pointer (AOTT_SRP). For the audio player, it is only necessary to have information about whether or not the title can reproduce only audio, and it is not necessary to distinguish between the audio title (AOTT) and the video / audio mixed title (AVTT / AOTT). Therefore, in the audio only title search pointer table (AOTT_SRPT) 243, the audio title (AOTT) and the audio / video title (AVTT / AOTT) are not distinguished, and all are described in a common format as the AOTT search pointer (AOTT_SRP). . Accordingly, for the audio / video title (AVTT / AOTT), the image dedicated title search pointer (AVTT_SRP) is described in the ATT search pointer table 242, but the audio title search pointer (AOTT_SRP) is described in the AOTT search pointer table 243. ) Will be described.
[0099]
For the image-only title (AVTT), only a frame for writing the title search pointer is prepared, but no substantial information is described, or this title does not have AOTT_SRP (reproduction only for audio) Not possible) is described. This is because the AOTT search pointer table 243 describes navigation information for the audio player, and the audio player cannot reproduce AV information. Therefore, the audio player determines that the title cannot be reproduced, and ignores this description.
[0100]
With reference to the AOTT title search pointer table 243 described as above, the audio player performs the reproduction shown in the right column of FIG. That is, the image information titles # 4, 6, and 7 are ignored, and the audio information is reproduced for the titles # 1, 2, 3, and 5.
[0101]
(4.3.2) VMG, VTSI, title search pointer
The VMG 3 includes VMGI (VMG Information) which is an actual part of navigation information. The VMGI includes a VMGI management table 250 containing information such as the VMGI file size and recording address, and a title search pointer table (TT_SRPT) 251. The title search pointer table 251 is a table describing navigation information about the video player. Therefore, the video player refers to the title search pointer table (TT_SRPT) 251 and reproduces the title according to the procedure determined in the conventional DVD video format. Therefore, there are two types of titles here, ie, an audio / video title (AVTT / AOTT) and an image-only title (AVTT), but the title search pointer table (TT_SRPT) 251 does not distinguish between the two. Are all described as TT_SRP.
[0102]
As described above, in the audio / video DVD, optimum navigation information is prepared for each of the audio player, the video player, and the compatible player, and recorded as three separate title search pointer tables. Thereby, optimal reproduction can be performed according to the capability of each reproducing apparatus.
[0103]
(4.4) Search pointer table structure
Next, the structure of the search pointer table will be further described.
[0104]
(4.4.1) ATT_SRPT, AOTT_SRPT, TT_SRPT
The ATT search pointer table 242 includes ATT search pointer information (ATT_ARPTI) 244 including information such as the number of ATT search pointers and a plurality of ATT search pointers 245 (in FIG. 8, a plurality of various search pointers 245 are collected. ATT_SRPS). In FIG. 8, the parentheses of each ATT search pointer indicate the type of search pointer actually described as the search pointer. As described above, the search pointer written in the ATT search pointer table 242 is either AOTT_SRP or AVTT_SRP.
[0105]
Similarly, the AOTT search pointer table 243 includes AOTT search pointer (AOTT_ARPTI) information 246 including information such as the number of AOTT search pointers, and a plurality of AOTT search pointers 247 (in FIG. 8, a plurality of AOTT search pointers 247 are included. Collectively referred to as AOTT_SRPS). In FIG. 8, the encirclement of each AOTT search pointer also indicates the type of search pointer actually described as the search pointer. As described above, the search pointers written in the AOTT search pointer table are all AOTT_SRPT.
[0106]
The positions of the ATT search pointer and the AOTT search pointer that designate the same title on each search pointer table must be the same. That is, the ATT search pointer on the ATT search pointer table 242 and the AOTT search pointer on the AOTT search pointer table 243 have a one-to-one correspondence, and ATT_SRPT # 1 and AOTT_SRPT # 1 specify the same title. .
[0107]
Similarly, the TT search pointer table 251 includes TT search pointer information (TT_SRPTI) 252 including information such as the number of TT search pointers and a plurality of TT search pointers 254 (in FIG. 8, a plurality of TT search pointers 254 are included). Collectively referred to as TT_SRPS).
[0108]
The ATT search pointer 245 and the AOTT search pointer 247 have a 1: 1 correspondence, but there is not necessarily a 1: 1 correspondence between the two and the TT search pointer. However, the TT search pointer is the same as the ATT search pointer and the AOTT search pointer in that the playback procedure is indicated by indicating the PGC that logically constitutes the target title.
[0109]
(4.5) Reproduction method of each title using the first reproduction control information
Next, with reference to FIGS. 6 and 8, a description will be given of a method of reproducing each of the three types of titles that can be recorded on the audio / video DVD.
[0110]
(4.5.1) Audio title (AOTT) playback method
An AOTT can be reproduced by an audio player and a compatible player. AOTT is a title for reproducing audio information, and the second reproduction control information SAPPT is also intended for reproduction of AOTT. However, the second reproduction control information is composed only of information necessary for realizing only a part of the reproduction forms. On the other hand, the first reproduction control information has a structure in which all necessary information can be described so that all reproduction forms handled in the DVD audio format are possible. The main playback modes (functions) of audio titles that can be realized by the first playback control information are as follows. However, it also includes a playback mode that can be realized in playback of audio / video titles (AVTT / AOTT) on an audio player.
[0111]
・ Multi-channel playback
In the DVD audio format, LPCM audio information in the video zone can be up to 8ch. As a discrete multichannel, a maximum of 6 channels are possible. In this case, it is possible to set 11 patterns for each channel from the combination of the front 3 channels + the rear 2 channels + subwoofer, and the combination of the discrete multichannel part and the signal for 2ch playback, a total of 24 patterns. It is. LPCM audio information in the audio zone can have a maximum of 6 channels, and 21 patterns are possible for each channel among the combinations of 3 front channels + 2 rear channels + subwoofer.
[0112]
・ 2ch playback
LPCM audio information of 2ch or less is reproduced as it is. The multi-channel LPCM audio information in the video zone is reproduced only for 2 channels of CH0 and CH1, and the multi-channel LPCM audio information in the audio zone is downmixed to 2ch based on the downmix coefficient separately defined for each track as 2ch. Reproduce.
[0113]
・ Audio selection
In the DVD audio format, audio information of two different playback formats can be defined as one title and can be selected by the user. This function is called audio selection. Specifically, the user can select different playback modes of 2ch and multi-channel for the same music piece. Also, as a choice other than 2ch and multi-channel, it is also possible to select and listen to LPCM recording audio information and audio information recorded by other coding methods (compressed sound, 1-bit sound, etc.) for the same song. .
[0114]
・ Change of attributes for each song
In the DVD audio format, the sampling frequency fs, the quantization bit number Qb, or the channel number can be changed for each song. Songs with different attributes are played back continuously, but there may be silence between songs to accommodate changes in attributes.
[0115]
Audio coding mode
Indicates the type of encoding method used when recording audio information. LPCM, Dolby AC3, MPEG audio, DTS, SDDS, and LPCM used for CDs are well known. The other is one of the compression coding systems.
[0116]
・ Multi-channel type
The type of LPCM multi-channel recording in the DVD audio format is shown. In the case of Type 1, up to 6 channels can be set, and the relationship of speaker arrangement to each channel can also be set in a combination of front 3 channels + back 2 channels + subwoofer.
[0117]
・ Channel assignments
The number of channels, the relationship between each channel and the output speaker arrangement, and the relationship between each channel and a channel group in the multi-channel of the LPCM are shown. For example, when a 3ch signal is recorded, CH0 is included in channel group 1 with a signal output from the left front speaker: Left front speaker, and CH1 is included in channel group 1 with a signal output from the right front speaker: front right. CH2 is a surround speaker: a signal that is output from the rear and indicates that it is included in channel group 2. As described above, when the multi-channel type is Type 1, 21 patterns can be set in the combination of the front 3 channels + the rear 2 channels + the subwoofer, and the channel assignment information is any of the 21 patterns. Indicates whether it is a combination.
[0118]
・ Multi-stream playback
Audio entity information recorded in the audio zone in the DVD audio format is recorded as a single audio stream in the AOB, but audio entity information recorded in the video zone is recorded in the VOB. Along with the stream, it is multiplexed and recorded for each pack. A VOB can multiplex a plurality of audio streams within a limited transfer rate range. For example, a 2ch / LPCM audio stream and a multi-channel / LPCM audio stream can be multiplexed, and a 2ch / LPCM audio stream and an AC-3 compressed audio stream can be multiplexed. These two audio streams having different playback forms can be selected by the user by designating an audio selection value.
[0119]
・ Downmix playback
In the multi-channel LPCM information in the DVD audio format, only the discrete multi-channel part may be recorded. That is, in this case, a 2ch playback signal is not recorded. Therefore, when the player performs multi-channel playback, there is no problem, but if only the CH0 and CH1 are used for playback with 2ch, only a part of the sound is heard. To play all multi-channel recorded sounds on 2 channels, down-mix the signals of all recording channels to L-mix, R-mix according to the downmix coefficient, and use this L-mix, R-mix 2ch playback. This is called downmix playback.
[0120]
・ Playback of scalable recording
Multi-channel LPCM information in the DVD audio format is recorded in two groups. These groups are called channel group 1 and channel group 2. Different sampling frequencies and quantization bit numbers can be set for each channel group, but channel group 1 is determined to have a larger value for both the sampling frequency and the quantization bit number. .
[0121]
・ Playing floating recording of Channel_Group_ # 2
Multi-channel LPCM information in the DVD audio format is recorded in two groups, and channel group 1 is determined to have a large value for both the sampling frequency and the number of quantization bits. For example, channel group 1: fs = 96 kHz, Qb = 24 bits, channel group 2: fs = 48 kHz, Qb = 16 bits, and so on. Therefore, when two signals with different quantization bits are played back simultaneously as multi-channel or down-mixed for 2ch playback, the noise level with the smaller quantization bit becomes dominant, and channel group 1 is 24 bits. However, as a whole, the dynamic range is 16 bits. This is because the signal of each channel group is reproduced based on the MSB. Therefore, this problem can be solved by reproducing a signal having a small quantization bit number according to the bit number and lowering the level. For this reason, the signal of channel group 2 is floating-recorded. That is, the number of quantization bits and the number of bit levels to be reproduced are determined for the channel group 2 signal.
[0122]
・ Title group selection
This is the maximum unit in the DVD audio format that the user can select and instruct the player. It is recognized by the user as a set of a plurality of songs (tracks). A title group is a set of a plurality of titles, but the user does not recognize the titles themselves. For example, in the case where 10 pieces of music information alone is the first, and 2 pieces of music are accompanied by video information, the title is 1 for the first 10 pieces and the title is 2 for the latter 2 pieces. However, the numbers for the songs are serial numbers in the title group, and when the user wants to reproduce the first song with video information, the track 11 is designated. No instruction such as track 1 of title 2 is given.
[0123]
・ Track selection
A unit in the DVD audio format that can be selected and instructed to the player by the user. Corresponds to one song or chapter.
[0124]
・ Index selection
In the DVD audio format, it is the smallest unit that the user can select and instruct the player. A unit in which a song (track) is further subdivided. Therefore, its usage is relatively free, and one index may be associated with a song number (No. 1, No. 2) in the same song. A plurality of indexes may correspond to the same music number in the same music. Therefore, since one index can be associated with the prelude, interlude, ending, rust (climax), etc. in the song (song number), various playback modes can be designated.
[0125]
・ Title group time display
Management and display of total time of title group, elapsed time (current time) and remaining time in title group. The time for each unit is described in the first reproduction control information so that these times can be managed.
[0126]
-Track time display
Management and display of total time of track, elapsed time in track (current time), remaining time, etc. The time for each unit is described in the first reproduction control information so that these times can be managed.
[0127]
-Index time display
Management and display of total index time, elapsed time (current time) and remaining time in the index. The time for each unit is described in the first reproduction control information so that these times can be managed.
[0128]
・ Spotlight playback
A playback format that selectively plays only the story in a song (track). Only a specific index can be reproduced by setting a plurality of indexes in a track and setting an index corresponding to a story-telling section as a spotlight section.
[0129]
・ Play using playback control commands
This is to realize an interactive playback mode.
[0130]
・ Playback using text information
In the case of the DVD audio format, two types of text information can be recorded. One is centralized text information for centrally managing the text related to the entire disk and using it for displaying and searching for songs. The other is real-time text information multiplexed in audio data. This is used to display the lyrics and the title of the song during playback.
[0131]
(4.5.1.1) Audio player
First, a method for reproducing an audio title (AOTT) by the audio player will be described. As described above, the audio player refers only to AOTT_SRPT 243 as navigation information. In FIG. 6, since AOTT is # 2 and # 5, when reproducing # 2, AOTT_SRP # 2 is referred to, and the ATS number (in this case, ATS # 1) including the title and the title number in the ATS (Refer to the path indicated by “P2A (1)” in FIG. 8). Next, the ATSI 211 of the corresponding ATS # 1 is referred to (see the path indicated by “P2A (2)” in FIG. 8), and the A (Audio) PGCI corresponding to the title is read from the title number in the previous ATS. . Therefore, at the time of reproduction, audio information is reproduced by reproducing the audio pack 43 in the AOB 210 in accordance with the APGCI specified by AOTT_SRP # 2 (see the path indicated by “P2A (3)” in FIG. 8).
[0132]
(4.5.1.2) For compatible players
Next, a method for playing back an audio title (AOTT) by a compatible player will be described. The compatible player refers to ATT_SRPT 242 as navigation information. Since AOTT is # 2 and # 5 in FIG. 6, when # 2 is reproduced, this ATT_SRP # 2 is referred to, and since it is AOTT_SRPT, it is recognized that the title is AOTT. Thereafter, as with the audio player, the ATS number (in this case, ATS # 1) including the title and the title number in the ATS are read (see the path indicated by “P2C (1)” in FIG. 8). ). Next, referring to the ATSI 211 of the corresponding ATS # 1 (refer to the path indicated by “P2C (2)” in FIG. 8), the APGCI corresponding to the title is read from the title number in the previous ATS. Therefore, at the time of reproduction, the audio information can be reproduced by reproducing the audio pack 43 in the AOB 210 in accordance with the APGCI designated by ATT_SRPT # 2 (see the path indicated by “P2C (3)” in FIG. 8).
[0133]
(4.5.2) Image-only title (AVTT)
Next, the reproduction path of the image-only title will be described. The video-only title can be played back by the video player and the compatible player.
[0134]
(4.5.2.1) Video player
The video player refers to TT_SRPT (title search pointer table) 251 as navigation information, and performs processing according to the playback procedure of the DVD video format. Therefore, the title search pointer table 251 of VMG3 is first referred to. Here, the description position of the search pointer on the title search pointer tables 242 and 243 of the corresponding title on the audio navigation and the description position of the title search pointer on the title search pointer table 251 of VMG3 correspond to 1: 1. It does not have to be. In other words, the contents and order of the AMGI ATT search pointer table 242 and the VMGI TT search pointer table 251 can be defined independently.
[0135]
However, in order to avoid confusion, when there is no title corresponding to TT_SRP 254 of VMGI in the title search pointer table 251, as a general rule, the title search pointer table 251 is described with a frame packed in the TT search pointer table. Accordingly, the title number may be different as shown in FIG. That is, there are seven titles in the audio / video dual-use DVD in the example shown in FIG. 6, but the video player does not reproduce the titles # 2 and # 5 which are AOTTs. TT_SRP for titles (titles # 1, # 3, # 4, # 6, # 7) is described in the title search pointer table 251. Therefore, TT_SRP # 1- # 5 in the title search pointer table 251 corresponds to each title # 1, # 2, # 3, # 4, # 5 managed by the VMG shown in the center column of FIG. ing.
[0136]
TT_SRP 254 indicates a PGC that logically configures a target title. Therefore, the video player reads the VTS number (in this case, VTS # 1) including the title and the title number in the VTS from the search pointer (see the path indicated by “P3V (1)” in FIG. 8). ). Next, the VTSI 11 of the corresponding VTS # 1 is referenced (see the path indicated by “P3V (2)” in FIG. 8), and the PGCI corresponding to the title is read from the title number in the previous VTS. Therefore, the video player acquires this PGCI and reproduces the title as AV information using a video pack, an audio pack, etc. in the VOB (refer to the path indicated by “P3V (3)” in FIG. 8).
[0137]
(4.5.2.2) For compatible players
Next, a description will be given of a path when the compatible player plays an image-only title (AVTT). The compatible player refers only to ATT_SRPT 242 as navigation information. In FIG. 6, since the image dedicated title (AVTT) is # 4, # 6, and # 7, when reproducing # 4, this ATT_SRP # 4 is referred to, and since it is AVTT_SRP, the title is an image dedicated title. Recognize that there is. As described above, it does not match the title number in the video player. However, thereafter, the VTS number (in this case, VTS # 1) including the title and the title number in the VTS and the title number in the VTS are read from the ATT_SRP 245 in the same manner as the video player reads from the TT_SRP (FIG. 8, (Refer to the path indicated by “P4C (1)”). Next, the VTSI 11 of the corresponding VTS # 1 is referenced (see the path indicated by “P4C (2)” in FIG. 8), and the PGCI corresponding to the title is read from the title number in the previous VTS. Therefore, the compatible player also acquires this PGCI and reproduces the title as AV information using a video pack, an audio pack, etc. in the VOB (see the path indicated by “P4C (3)” in FIG. 8).
[0138]
(4.5.2.3) Audio player
Next, the case of an audio player will be described. The audio player refers only to AOTT_SRPT243 as navigation information. Therefore, although AOTT_SPR # 4 is read, since it is written that there is no corresponding AOTT, reproduction is stopped. (In FIG. 8, since nothing is described in a place corresponding to AOTT_SPR # 4, the audio player stops reproduction).
[0139]
(4.5.3) In the case of a video / audio title (AVTT / AOTT)
The video / audio mixed title is played back by all the audio players, video players, and compatible players. Therefore, it demonstrates in this order.
[0140]
(4.5.3.1) Audio player
First, a method for reproducing an audio / video title by an audio player will be described. The audio player refers only to AOTT_SRPT243 as navigation information. In FIG. 6, since the audio / video titles (AVTT / AOTT) are # 1 and # 3, when # 1 is reproduced, AOTT_SRP # 1 is referred to, and the ATS number (ATS # 3 in this case) including the title is referred to. The title number in the ATS is read (see the path indicated by “P1A (1)” in FIG. 8). Next, referring to the ATSI 212 of the corresponding ATS # 3 (see the path indicated by “P1A (2)” in FIG. 8), the APGCI corresponding to the title is read from the title number in the previous ATS. However, this ATS # 3 does not include audio data as an entity, and this APGCI indicates a playback procedure for the VOB 10 of VTS # 1. Therefore, at the time of reproduction, only the audio information is reproduced by reproducing only the audio pack 43 in the VOB 10 in accordance with this APGCI (see the path indicated by “P1A (3)” in FIG. 8).
[0141]
(4.5.3.2) Video player
Next, a method for reproducing a video / audio title by the video player will be described. As described above, the video player performs processing according to the playback procedure of the video format regardless of the type of the disc. Therefore, the title search pointer table 251 of VMG3 is first referred to. The title number here is # 1, which matches the title number on the audio navigation. Subsequent paths are the same as in the case of (5.2.1), and thus description thereof is omitted. (See the path shown in Figure 8, “P1V (1), (2), (3)”)
[0142]
(4.5.3.3) For compatible players
Next, a method for playing back a video / audio title by a compatible player will be described. The compatible player refers only to ATT_SRPT 242 as navigation information. Therefore, it is recognized that it is AVTT with reference to this ATT_SRP # 1. Thereafter, in the same manner as the video player reads from TT_SRP 254, the VTS number (in this case, VTS # 1) including the title and the title number in the VTS are read from ATT_SRP 245 (FIG. 8, “P1C (See the path indicated by (1)). Since the subsequent paths are the same as those of the video player, description thereof will be omitted (see the paths indicated by “P1C (2) and P1C (3)” in FIG. 8).
[0143]
As described above, the first playback control information includes not only video navigation information and audio navigation information, but also information that integrates them or information that associates them. It is possible to eliminate inconsistencies and confusion when playing titles with different playback formats on various players with different playback capabilities.
[0144]
(5) Second reproduction control information
Next, the second reproduction control information among the recording information on the audio DVD will be described. Here, the second reproduction control information refers to the SAPPT 204 recorded at the head of the audio zone. This SAPPT is a set of reproduction control information necessary for reproducing audio information of audio titles recorded on the disc and audio / video titles (AVTT / AOTT) in a limited form.
[0145]
The reproduction mode (function) that can be realized by using SAPPT that is the second reproduction control information is 2ch reproduction among the previously prepared reproduction types that can be realized by using the APGCI that is the first reproduction control information. Attribute change, audio coding mode (only linear PCM supported), downmix playback, scalable recording, Channel_Group_ # 2 floating recording, title group selection, track selection, title group time and track time display is there.
[0146]
As described above, in the audio DVD, audio information as entity information is recorded in each ATS 203 or each VTS 4, and address information and time information of each cell in the first reproduction control information are each APGCI. It is described in ATSI 211 in ATS3. Further, incidental information regarding the attribute of the audio information (AOB) is described in the ATSI 211 in each ATS 3. Therefore, in order to reproduce the audio information belonging to each title group, it is necessary to obtain the reproduction control information (APGCI) and attribute information with reference to the ATSI in each ATS.
[0147]
Incidentally, the reproduction control information (APGCI) in the control data of the ATSI 211 is not only information for reproducing a track, but also various information for realizing various functions, for example, information on each cell, song number search, Contains information for special playback. However, a simple playback device such as a portable player usually does not require many functions, and only a part of this playback control information (APGCI) is used. Further, every time the title changes, it is necessary to read out new playback control information (APGCI) from the disc and record it in the memory. Therefore, in order to know how many songs are recorded on the entire disk, what kind of attributes the song is composed of, and whether there are duplicate songs, etc., all playback control information (APGCI) is read and searched And need to be calculated. This is time consuming and inefficient.
[0148]
Therefore, in the present invention, limited playback of all tracks (songs) that can be played back by 2ch included in an audio title (AOTT) recorded on a DVD disc, that is, one of all playback modes prepared in advance. The playback control information for playback in the playback mode is recorded as second playback control information (SAPPT) in the lead-in area LI or at the head of the audio zone. By doing so, it is possible to easily and quickly acquire the playback control information by referring to the SAPPT without being aware of the title and the ATS and VTS to which the title belongs, even when playing any song belonging to any title group, Smooth playback is possible. That is, by recording the playback control information at the lead-in area LI or the head of the audio zone, it is possible to obtain the playback control information necessary for playback of the music immediately after the audio DVD disc is inserted.
[0149]
As described above, an audio / video DVD has a video zone according to the DVD video format and an audio zone according to the DVD audio format. Information reproducible from an audio / video DVD is AV information (video information with sound) such as a movie and audio information. Then, when each piece of information is played back by various players, the first playback control information for preventing confusion or contradiction is separately recorded on the audio / video DVD for each player. Yes. On the other hand, the second reproduction control information is only information related to a track that can be reproduced by 2ch, and information for realizing only a part of the reproduction format. In (4), the case where the title is played back using the first playback control information has been described, but the playback control using the second playback control information is the same as the audio title shown in (4.5.1). This corresponds to a case where an audio / video title is played back by an audio player.
[0150]
In the case of FIG. 6, there are seven title groups in this audio / video DVD. Each title group corresponds to one title (title group # 1 corresponds to title # 1, title group # 2 corresponds to title # 2, etc.).
[0151]
For an audio player that only reproduces audio information, the title group can be regarded as a concept equivalent to one conventional CD album. In the case of FIG. 6, the user adds four different CD albums to one audio DVD. Recognized as recorded. The user selects a desired title group as if he / she wants to select a CD album he / she wants to listen to from among four different CD albums. However, seven title groups are recognized by users of compatible players. If there is an image-dedicated title as shown in this figure, it is necessary to instruct “title group # 5” regardless of the case where the audio player selects the fourth title group. Therefore, the user must look at the jacket or the like and indicate his / her desired title group.
[0152]
The information recorded in the SAPPT includes each track (song) number for each title group and its start address and end address. These may be absolute addresses on the audio DVD or may be relative addresses from the position where the SAPPT is recorded. Further, channel assignment, sampling frequency fs, and quantization bit number Qb, which are attribute information of each track, are also described. Also, the track start time and playback time are described as track time information. FIG. 9 shows an example of a part of information described in the SAPPT having the logical structure in FIG. FIG. 10 is a diagram showing the relationship between the logical structure in FIG. 6 and the physical arrangement on the disk.
[0153]
When the user designates a title group to be reproduced, the reproducing apparatus can obtain information on all tracks of the corresponding title group only by reading the SAPPT. The information obtained here corresponds to a part of APGCI which is the first reproduction control information described above. By referring to the address information of each track written here, the audio information in the ATS or the audio information in the VTS from the start address to the end address is reproduced. In reproduction using SAPPT which is the second reproduction control information, it is not necessary to refer to APGCI which is the first reproduction control information. However, in reproduction based on SAPPT, for example, linear PCM audio information can be performed only in a 2ch stereo reproduction form, and a variety of reproduction forms rich in interactivity based on APGCI cannot be performed.
[0154]
Also, SAPPT includes audio attribute information. The audio attribute information is information relating to the attribute of the audio information of all tracks recorded on the audio DVD and capable of 2ch playback. The attribute information is composed only of information necessary for 2ch playback. Specifically, the audio attribute information includes audio information encoding method, sampling frequency, number of quantization bits, channel assignment information indicating the number of channels included as audio information and the relationship between each channel and channel group, Etc. Therefore, it is not necessary to refer to the AMG and ATSI that are the first reproduction control information in the reproduction using the SAPPT that is the second reproduction control information. The audio DVD playback apparatus automatically performs playback in accordance with the audio attribute information.
[0155]
Further, the reproduction using SAPPT which is the second reproduction control information has the following characteristics. In the DVD audio format, the same track (song) can be used repeatedly with different titles. For example, title group # 3 may be configured to include tracks that are also included in title groups # 1 and # 2. That is, the same audio information as track # 1 of title group # 1 can be used as the track of title group # 3. The audio information corresponding to these overlapping tracks is the same, and the address attribute information is the same.
[0156]
The playback apparatus can determine whether or not the track is a duplicate track by comparing the address information in the SAPPT. That is, the track address information reproduced so far is stored in the memory, and it is determined whether or not the same address information as the track reproduced this time exists in the memory. If the same address information does not exist in the memory, the current track is reproduced, and if it exists in the memory, it is determined that it is a duplicate track and is not reproduced.
[0157]
In this way, by duplicating tracks, the same music is reproduced in duplicate when dubbing audio information recorded on an audio-only DVD disc to another information recording medium such as an MD (mini disc). And copying to the MD can be prevented.
[0158]
As described above, one title group is recognized by the user as corresponding to one CD album. Therefore, in the above-described example, if the user inputs an instruction to sequentially reproduce from title group # 1 to title group # 3 to the reproducing apparatus, the same song is reproduced multiple times (hereinafter, this The playback mode is called “normal playback”.) Some users may not like such repetition. In addition, when dubbing this audio DVD song to an MD or the like, the same song is repeatedly recorded, which is inappropriate. In such a case, the duplicate track can be easily detected by describing the duplicate flag in the SAPPT. Therefore, if the overlapping track is determined by referring to this flag or comparing the address information and the overlapping track is not reproduced, it is possible to prevent the same music from being reproduced repeatedly. That is, all the substantial audio information (songs) recorded on the disc can be played back once (this playback mode is referred to as “non-overlapping playback” hereinafter).
[0159]
In SAPPT, a playback time is further recorded. Specifically, the playback time for each track, the total playback time for each title group, the total playback time of the disc, and the total recording time of the disc. Here, the total disc playback time is the playback time when the tracks of each group are played in order (normal playback), and the overlapping track is the playback time when the same track as another group is played back again. . On the other hand, the total disc recording time is the total reproduction time in the non-overlapping reproduction, that is, the mode in which the same music piece is not repeatedly reproduced. The total recording time is useful information when dubbing an audio DVD song onto a tape or the like as described above. Alternatively, only the playback time of each track may be stored during SAPPT, and various total playback times may be obtained by adding the playback time of each track. For example, the total disc playback time can be obtained by adding the playback times of tracks included in all title groups. The total disc recording time can be obtained by referring to the duplication flag or comparing the address information to determine the duplication track, and totaling the reproduction times of the tracks included in all title groups excluding the duplication track.
[0160]
(6) Playback device
(6.1) Video DVD player
As shown in FIG. 11, the video DVD player according to the embodiment includes a pickup 80, a demodulation / correction unit 81, stream switches 82 and 84, a track buffer 83, a system buffer 85, a demultiplexer 86, and a VBV. (Video Buffer Verifier) buffer 87, video decoder 88, sub-picture buffer 89, sub-picture decoder 90, mixer 91, audio buffer 92, audio decoder 93, input unit 98, display 99, A system controller 100, a drive controller 101, a spindle motor 102, and a slider motor 103 are included. The configuration shown in FIG. 11 describes only the portion related to the reproduction of video and audio in the configuration of the video DVD player, and the servo for servo-controlling the pickup 80, the spindle motor 102, the slider motor 103, and the like. Since the circuit and the like are the same as those of the prior art, the description and detailed description are omitted.
[0161]
Next, the operation will be described.
The pickup 80 includes a laser diode (not shown), a beam splitter, an objective lens, a photodetector, and the like. Then, the detection signal Sp corresponding to the information pit formed on the DVD 1 is output. At this time, the light beam B is accurately applied to the information track on the DVD 1 and is focused on the information recording surface on the DVD 1 with respect to an objective lens (not shown) in the same manner as the conventional technique. Thus, tracking servo control and focus servo control are performed.
The detection signal Sp output from the pickup 80 is input to the demodulation and correction unit 81, subjected to demodulation processing and error correction processing to generate a demodulation signal Sdm, and is output to the stream switch 82 and the system buffer 85.
[0162]
The stream switch 82 to which the demodulated signal Sdm is input is controlled to open and close by the switch signal Ssw1 from the drive controller 101. When the stream switch 82 is closed, the input demodulated signal Sdm is directly passed through and output to the track buffer 83. On the other hand, when the stream switch 82 is opened, the demodulated signal Sdm is not output, and unnecessary information (signal) is not input to the track buffer 83. The track buffer 83 to which the demodulated signal Sdm is input is configured by a FIFO (First In First Out) memory or the like, temporarily stores the input demodulated signal Sdm, and when the stream switch 84 is closed, The stored demodulated signal Sdm is continuously output.
[0163]
The stream switch 84 to which the demodulated signal Sdm is continuously input is used in the system so that in the demultiplexing process in the demultiplexer 86, the various buffers in the subsequent stage do not overflow or conversely become empty and the decoding process is not interrupted. Opening and closing is controlled by a switch signal Ssw2 from the controller 100. On the other hand, the system buffer 85 to which the demodulated signal Sdm is input in parallel with the track buffer 83 is detected first when the DVD 1 is loaded, and management information (such as VMG3) related to the entire information recorded on the DVD 1 or for each VTS 4 The VTS 11 is accumulated and output to the system controller 100 as control information Sc, and the DSI data 51 for each navigation pack 41 is temporarily accumulated during reproduction and output to the system controller 100 as control information Sc.
[0164]
In the demultiplexer 86 to which the demodulated signal Sdm is continuously input via the stream switch 84, video data, audio data, sub-picture data, and PCI data for each navigation pack are extracted from the demodulated signal Sdm for each pack. The video signal Sv, the sub-picture signal Ssp, the audio signal Sad, and the PCI signal Spc are output to the VBV buffer 87, the sub-picture buffer 89, and the audio buffer 92, respectively. At this time, the demultiplexer 86 extracts a pack header, a packet header, and the like from each pack (including the audio pack 43) and the packet, and outputs information included in each to the system controller 100 as a header signal Shd.
[0165]
The VBV buffer 87 to which the video signal Sv is input is constituted by a FIFO memory or the like, temporarily stores the video signal Sv, and outputs it to the video decoder 88. The VBV buffer 87 is for compensating for variations in the data amount for each picture in the video signal Sv compressed by the MPEG2 system. Then, the video signal Sv compensated for the variation in the data amount is input to the video decoder 88, demodulated by the MPEG2 system, and output to the mixer 91 as a demodulated video signal Svd. On the other hand, the sub picture buffer 89 to which the sub video signal Ssp is input temporarily stores the input sub video signal Ssp and outputs it to the sub picture decoder 90. The sub picture buffer 89 is for outputting the sub picture data 44 included in the sub video signal Ssp in synchronization with the video data 42 corresponding to the sub picture data 44. Then, the sub video signal Ssp synchronized with the video data 42 is input to the sub picture decoder 90, demodulated, and output to the mixer 91 as a demodulated sub video signal Sspd.
[0166]
The demodulated video signal Svd output from the video decoder 88 and the demodulated sub-video signal Sspd output from the sub-picture decoder 90 (synchronized with the corresponding demodulated video signal Svd) are mixed by the mixer 91, The video signal Svp to be finally displayed is output to a display unit such as a CRT (Cathod Ray Tube) (not shown).
[0167]
The audio buffer 92 to which the audio signal Sad is input is configured by a FIFO memory or the like, temporarily stores the input audio signal Sad, and outputs it to the audio decoder 93. The audio buffer 92 is for outputting the audio signal Sad in synchronization with the video signal Sv including the corresponding video information or the sub-video signal Ssp based on the header control signal Shc output from the system controller 100. The audio signal Sad is delayed according to the output status of the corresponding video information. Then, the audio signal Sad time-adjusted so as to be synchronized with the corresponding video information is output to the audio decoder 93, and based on the header control signal Shc output from the system controller 100, reproduction processing in the linear PCM system is performed. Then, it is output as a demodulated audio signal Sadd to a speaker or the like (not shown). Note that an audio DVD containing only music information does not require synchronization processing with video information.
[0168]
(6.2) Audio DVD player
Next, the above-described audio DVD player will be described with reference to FIG. As shown in FIG. 12, the audio DVD player differs from the video DVD player shown in FIG. 11 in the configuration of the subsequent stage of the demultiplexer 86, but otherwise has the same configuration. Therefore, the components after the demultiplexer 86 will be described.
[0169]
In the demultiplexer 86 to which the demodulated signal Sdm is continuously input via the stream switch 84, the audio information is extracted for each pack from the demodulated signal Sdm, and is output to the audio buffer 92 as the audio signal Sad. The audio buffer 92 to which the audio signal Sad is input is configured by a FIFO memory or the like, temporarily stores the input audio signal Sad, and outputs it to the audio decoder 93. The audio signal Sad is input to the audio decoder 93, subjected to reproduction processing or the like based on the control signal Shc output from the system controller 100, and output as a demodulated audio signal Sadd to a speaker (not shown).
[0170]
FIG. 13 shows the configuration of the audio decoder 93. As illustrated, the audio decoder 93 includes a signal processing unit 120 including a digital filter, a D / A converter 121, an analog output circuit 122 including an amplifier, a digital output circuit 123, and a system microcomputer 124 including a RAM 124a. And a clock circuit 125.
[0171]
The system microcomputer 124 exchanges a control signal Sca with the system controller 100 and controls operations of the clock circuit 125, the signal processing unit 120, the D / A converter 121, and the analog output circuit 122. The system microcomputer 124 has a RAM 124a inside. The RAM 124a temporarily stores audio attribute information supplied as a control signal Sca from the system controller 100. The system microcomputer 124 refers to the audio attribute information stored in the RAM 124 a and supplies the contents to the clock circuit 125 and the signal processing unit 120. Specifically, the system microcomputer 124 supplies the sampling frequency information in the audio attribute information to the clock circuit 125. The clock circuit 125 includes an oscillator and supplies the clock signal fs corresponding to the designated sampling frequency to the signal processing unit 120. Further, the system microcomputer 124 supplies the sampling frequency, the number of quantization bits, the number of channels, and the presence / absence of emphasis in the audio attribute information to the signal processing unit 120 and provides the D / A converter 121 with the number of channels information. Further, the system microcomputer 124 supplies information such as the amplification degree of the signal of each channel to the analog output circuit 122. Information on the degree of amplification for each channel can be included in the audio attribute information and supplied from the system controller 100.
[0172]
The signal processing unit 120 uses the clock signal fs from the clock circuit 125 and an audio buffer according to information such as a coding method (linear PCM or Dolby AC3) obtained from the system microcomputer 124, a sampling frequency, and the number of quantization bits. The audio signal supplied from 92 is decoded or band-limited, and further, de-emphasis processing is performed according to information on the presence / absence of emphasis, and output to the D / A converter 121. The D / A converter 121 divides the input signal for each channel according to the channel information obtained from the system microcomputer 124, and outputs the divided signal to the analog output circuit 122 as an analog signal for each channel. Further, the signal processing unit 120 outputs the digital audio signal Sadd to the outside via the digital output circuit 123.
[0173]
Real-time information such as real-time text is output from the demultiplexer to the RTI buffer. The data temporarily stored in the RTI buffer is output to the RTI decoder based on the control signal Shc output from the system controller 100, and the lyrics and the like are displayed on a display device (not shown). When it is detected that it is necessary to temporarily suspend (pause) the audio immediately after the access to the desired information, the system controller 100 outputs a pause signal Sca to the audio decoder 93. The audio decoder 93 temporarily stops outputting the demodulated audio signal Sadd.
[0174]
(7) Playback using first playback control information and playback method using second playback control information (7.1) Playback using first playback control information
In playback using the first playback control information, playback of a title is fundamental. Therefore, the case of reproducing the audio-only DVD reproduction having the logical structure shown in FIG. 19 will be described focusing on the reproduction of the title.
[0175]
This audio-only DVD has title groups # 1 to # 3 in the volume. Title group # 1 is composed of title # 1 to title # j-1. Title # 1 has three tracks, title # j-1 has two tracks i-1 and i, and each other title has one or more tracks. It shall have. Title group # 2 is composed of titles #j and j + 1, title #j has tracks 1 to m, and title # j + 1 has tracks m + 1 to n. Title group # 3 is composed of one title # j + 2, and title # j + 2 has tracks 1 and 2. Here, the relationship between the title group and the title is written in the AOTT search pointer as described above in (4). Therefore, it is necessary to first read the AOTT search pointer.
[0176]
The operation of the playback apparatus when the first playback control information is used is shown in FIGS. When the audio-only DVD is inserted into the playback device, the UDF is read after the lead-in area LI to confirm the file structure, and then the AMG is read (step S1). Next, the title group to be reproduced is recognized based on the user's instruction (step S2). If there is no instruction from the user, a preset title group, for example, title group # 1 or all title groups is recognized as a title group to be reproduced. Here, it is assumed that the title group # 2 is selected by the user.
[0177]
Then, a title search pointer which is navigation information of titles included in the selected title group is stored in the memory (step S3). Here, since title group # 2 is selected, the title search pointers stored in the memory are those of title #j and title # j + 1. Since this is an audio-only DVD, the search pointer actually stored is AOTT_SRPT #. j, # j + 1. When the storage of the search pointer is completed, the reproduction of the title is started (step S4). The pickup is jumped to ATS # 2 where the entity information and playback control information of title #j are recorded (step S5), ATSI in ATS # 2 is read (step S6), and the playback control information of title #j is used. APGCI in a certain ATSI is read (step S7).
[0178]
From the information in the read APGCI, it can be recognized that the tracks included in the title #j are tracks 1 to m, and an address table for each track is created (step S8). Next, the start address and end address of each title are acquired (steps S9 to S15). As a specific address acquisition method, it is determined whether the address information acquired in step S9 is the start address of the track head. If it is a start address (step S9: YES), the process proceeds to step S11, and the start address of this track is stored in the memory. If it is not the start address of the track (step S9: NO), the process proceeds to step S10, the next address information is referenced, and the process returns to step S9.
[0179]
When the start address of this track is acquired, it is determined whether or not the next address information is the end address of the track (step S12). If it is an end address (step S12: YES), the process proceeds to step S14, and the end address of this track is stored in the memory. If it is not the end address of the track (step S12: NO), the process proceeds to step S13, the next address information is referenced, and the process returns to step S12. If both the start address and end address of the track have been acquired, the process proceeds to step S15 to determine whether the start address and end address of all tracks included in the title to be reproduced have been acquired. If there is a track for which address information has not been acquired (step S15: NO), the process returns to step S9, and the address information acquisition step is repeated. If the start address and end address of all tracks included in the title to be reproduced have been acquired (step S15: YES), the creation of the address table is completed and the track is reproduced.
[0180]
In reproducing the track, first, i = 0 is set in step S16. In step S17, i = i + 1 is set and the track number is incremented. Then, the playback device is set so as to conform to the attribute information of track number i (step S18), and the start address and end address of track number i are loaded from the created address table (step S19). Next, the pickup is moved based on the start address loaded at the position on the disc where the entity information of track number i is recorded (step S20), and AOB is reproduced (step S21). If the currently reproduced address is the end address of track number i in step S22 (step S22: YES), the process proceeds to step S23. If the currently reproduced address does not reach the end address of the track number i (step S22: NO), the process returns to step S21 and the AOB is continuously reproduced.
[0181]
In step S23, it is determined whether or not the track number i has reached the number of tracks included in the title (i = m if title # 2). If the track number i is the number of tracks included in the title (step S23: YES), it is determined that all tracks in the title #j have been reproduced, and the process proceeds to step S24, where the reproduction of the title #j is terminated. If the track number i is not the number of tracks included in the title (step S22: NO), there is a track that has not been reproduced yet, so the process returns to step s17 to reproduce the next track. After the reproduction of title #j is completed, it is determined in step S25 whether there is a next title to be further reproduced. Further, when there is a title to be played back (step S25: YES), the title search pointer of title # j + 1 stored in step S3 is referred to and step S4 and subsequent steps are repeated in the same manner as the playback of title #j. Further, when there is no title to be reproduced (step S25: NO), the reproduction is terminated.
[0182]
(7.2) Playback using second playback control information
FIG. 17 and FIG. 18 show the operation of the playback apparatus when the SAPPT that is the second playback control information is used. It is assumed here that an audio-only DVD having a logical structure as shown in FIG. 19 is reproduced.
[0183]
When the audio-only DVD is inserted into the playback device, the SAPPT at the head of the audio zone is stored in the memory (step S100). Next, the title group to be reproduced is recognized based on the user's instruction (step S101). If there is no instruction from the user, a preset title group, for example, title group # 1 or all title groups are recognized as title groups to be reproduced. Here, it is assumed that the title group # 2 is selected by the user. Then, the address information, attribute information, etc. of all the tracks having the selected title group number 2 are stored in the memory from the stored SAPPT (step S102). There is no need to recognize the title and the ATS including the title as in the case of using the first reproduction control information. When the number of the title group to be reproduced is determined, all the information for reproducing the tracks included in the title group in 2ch can be obtained by referring to the SAPPT. Here, since the title group # 2 is selected, the information stored in the memory relates to the track # 1 to the track #n.
[0184]
Next, when reproducing a track, first, i = 0 is set in step S103. In step S104, i = i + 1 is set and the track number is incremented. Then, the playback device is set to the audio information attribute of track number i (step S105), and the pickup is moved to a position on the disc where the actual information of track i is recorded based on the start address of track number i (step S106). ), AOB reproduction is performed (step S107). If the currently reproduced address is the end address based on the SAPPT of the track number i in step S109 (step S108: YES), the process proceeds to step S109. If the currently reproduced address does not reach the end address of the track number i (step S108: NO), the process returns to step S107 and the AOB is continuously reproduced.
[0185]
In step S109, it is determined whether or not the track number i has reached the number of tracks included in the title group (i = n if title group # 2). If the track number i is equal to the number of tracks included in the title group (step S190: YES), the reproduction of the title group # 2 is terminated assuming that all the tracks in the title group # 2 have been reproduced. If the track number i is not the number of tracks included in the title group # 2 (step S109: NO), there is a track that has not been reproduced yet, so the process returns to step s104 to reproduce the next track. After the reproduction of all tracks of title group # 2 is completed, the reproduction is terminated.
[0186]
As described above, even when any music piece belonging to any title group is reproduced, the reproduction control information can be acquired easily and quickly by referring to the SAPPT, and smooth reproduction is possible. That is, by recording the second playback control information at the head of the lead-in area LI, AMG, or audio zone, it is possible to obtain playback control information necessary for playback of a song immediately after insertion of the audio DVD disc. Therefore, according to the present invention, a wide variety of complex functions and interactive playback can be realized using the first playback control information, and the second playback control information can be used when a limited partial function is realized. By using, playback can be performed with simple processing.
[0187]
【The invention's effect】
According to the first aspect of the invention, by recording the optimum navigation information for a plurality of players, the player can select the optimum navigation information and the reproduction process is simplified.
[Brief description of the drawings]
FIG. 1 is a diagram showing a physical structure (physical format) of a DVD video format.
FIG. 2 is a diagram showing a logical structure (logical format) of a DVD video format.
FIG. 3 is a diagram showing a physical structure (physical format) of a DVD audio format.
FIG. 4 is a diagram showing a logical structure (logical format) of a DVD audio format.
FIG. 5 is a diagram showing types of DVDs.
FIG. 6 shows an example of an audio / video DVD.
FIG. 7 is a diagram showing a concept of double management of the same object.
FIG. 8 is a diagram showing an example of navigation information defined for the audio / video DVD shown in FIG. 6;
FIG. 9 is a diagram illustrating information recorded in SAPPT.
FIG. 10 is a diagram showing an image of physical arrangement on a disk.
FIG. 11 is a diagram showing a schematic configuration of a video DVD player.
FIG. 12 is a diagram showing a schematic configuration of an audio DVD player.
FIG. 13 is a diagram illustrating a configuration of an audio decoder.
FIG. 14 is a flowchart illustrating a playback operation using the first playback control information.
FIG. 15 is a flowchart showing a playback operation using the first playback control information.
FIG. 16 is a flowchart showing a state of a reproduction operation using the first reproduction control information.
FIG. 17 is a flowchart illustrating a playback operation using second playback control information.
FIG. 18 is a flowchart showing a state of a reproduction operation using second reproduction control information.
FIG. 19 is a diagram illustrating an example of a logical structure of an audio-only DVD.
[Explanation of symbols]
3 ... VMG
10 ... VOB
11 ... VTSI
202 ... AMG
204 ... SAPPT
210 ... AOB
211 ... ATSI
240 ... AMGI

Claims (20)

In a recording medium having a video area for mainly recording video information and AV information including audio information accompanying the video information, and an audio area for mainly recording audio information,
Navigation information for a video player capable of reproducing the AV information;
Navigation information for an audio player capable of reproducing audio information in the video area and audio information in the audio area;
Navigation information for a simple audio player for reproducing the audio information of the video area and the audio information of the audio area with a simple audio player;
Navigation information for a compatible player capable of reproducing both the AV information and the audio information;
A recording medium comprising: The video player navigation information defines the reproduction of AV information from the video area,
The audio player navigation information defines reproduction of audio information from the audio area and reproduction of only audio information from the video area,
The navigation information for the simple audio player defines that for reproducing audio information from the audio information Ho及 beauty the video area from the audio area in two channels or less,
The recording medium according to claim 1, wherein the compatible player navigation information defines reproduction of audio information from the audio area and reproduction of AV information from the video area. On the recording medium, one or a plurality of titles which are one unit in reproduction are recorded,
The title is
An audio title constituted by reproduction of audio information in the audio area;
A video title constituted by reproduction of AV information in the video area;
The recording medium according to claim 1, wherein the recording medium is classified as follows.   A part or all of the video title is a dual-purpose title in which the AV information is reproduced in the video player and the compatible player, and audio information in the AV information is reproduced in the audio player. Item 4. A recording medium according to Item 3. The video player navigation information indicates a recording position on the recording medium of reproduction control information for reproducing the AV information of the video title,
The audio player navigation information includes a recording position of reproduction control information for reproducing audio information of the audio title on the recording medium, and the recording of reproduction control information for reproducing audio information of the dual-purpose title. Indicates the recording position on the medium,
The navigation information for the simple audio player indicates the recording position of the audio information of the audio title and the audio information of the dual-purpose title on the recording medium,
The navigation information for the compatible player includes the recording position on the recording medium of the playback control information for playing back the AV information of the video title including the dual title, and the playback control for playing back the audio information of the audio title. 5. The recording medium according to claim 4, wherein the recording position of information on the recording medium is indicated. The navigation information for the simple audio player, the navigation information for the audio player, and the navigation information for the compatible player are recorded in the audio area,
6. The recording medium according to claim 1, wherein the video player navigation information is recorded in the video area. 6. The recording according to claim 3, wherein the video title playback control information is recorded in the video area, and the audio title playback control information is recorded in the audio area. Medium. The playback control information for the dual-purpose title is:
Playback control information for an audio player recorded in the audio area;
6. The recording medium according to claim 4 , comprising playback control information for a compatible player recorded in the video area. In the video title which is also the dual-use title of 1,
The reproduction control information of the dual-purpose title indicated by the compatible player navigation information and the reproduction control information of the video title indicated by the video player navigation information are recorded at the same position. 8. The recording medium according to 8. In the audio title of 1,
The audio title reproduction control information indicated by the compatible player navigation information and the audio title reproduction control information indicated by the audio player navigation information are recorded at the same position. 8. The recording medium according to 8. An information reproducing apparatus for reproducing information from the recording medium according to claim 1,
Selection means for selecting any one of the navigation information for the video player, the navigation information for the audio player, the navigation information for the simple audio player, and the navigation information for the compatible player;
An information reproducing apparatus comprising: reproducing means for reproducing recorded information from the recording medium based on selected navigation information. An information reproducing apparatus for reproducing information from the recording medium according to claim 1,
Selection means for selecting the video player navigation information from the video player navigation information, the audio player navigation information, the simple audio player navigation information, and the compatible player navigation information;
An information reproducing apparatus comprising: reproducing means for reproducing recorded information from the recording medium based on the selected navigation information for the video player. An information reproducing apparatus for reproducing information from the recording medium according to claim 1,
Selection means for selecting the navigation information for the audio player from the navigation information for the video player, the navigation information for the audio player, the navigation information for the simple audio player, and the navigation information for the compatible player;
An information reproducing apparatus comprising: reproducing means for reproducing recorded information from the recording medium based on the selected navigation information for the audio player. An information reproducing apparatus for reproducing information from the recording medium according to claim 1,
Selection means for selecting the navigation information for the simple audio player from the navigation information for the video player, the navigation information for the audio player, the navigation information for the simple audio player, and the navigation information for the compatible player;
An information reproducing apparatus comprising: reproducing means for reproducing recorded information from the recording medium based on the selected navigation information for the simple audio player. An information reproducing apparatus for reproducing information from the recording medium according to claim 1,
Selection means for selecting the navigation information for the compatible player from the navigation information for the video player, the navigation information for the audio player, the navigation information for the simple audio player, and the navigation information for the compatible player;
An information reproducing apparatus comprising: reproducing means for reproducing recorded information from the recording medium based on the selected compatible player navigation information. An information reproducing method for reproducing information from the recording medium according to claim 1,
Selecting one of the navigation information for the video player, the navigation information for the audio player, the navigation information for the simple audio player, and the navigation information for the compatible player;
And a step of reproducing the recorded information from the recording medium based on the selected navigation information. An information reproducing method for reproducing information from the recording medium according to claim 1,
Selecting the video player navigation information from the video player navigation information, the audio player navigation information, the simple audio player navigation information, and the compatible player navigation information;
And reproducing the recorded information from the recording medium based on the selected navigation information for the video player. An information reproducing method for reproducing information from the recording medium according to claim 1,
Selecting the audio player navigation information from the video player navigation information, the audio player navigation information, the simple audio player navigation information, and the compatible player navigation information;
And reproducing the recorded information from the recording medium based on the selected navigation information for the audio player. An information reproducing method for reproducing information from the recording medium according to claim 1,
Selecting the navigation information for the simple audio player from the navigation information for the video player, the navigation information for the audio player, the navigation information for the simple audio player, and the navigation information for the compatible player;
And reproducing the recorded information from the recording medium based on the selected navigation information for the simple audio player. An information reproducing method for reproducing information from the recording medium according to claim 1,
Selection means for selecting the navigation information for the compatible player from the navigation information for the video player, the navigation information for the audio player, the navigation information for the simple audio player, and the navigation information for the compatible player;
An information reproducing method comprising: reproducing means for reproducing recorded information from the recording medium based on the selected compatible player navigation information.

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