JP3586254B2 - Recording medium, recording method, and reproducing apparatus for audio information - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an audio information recording medium, a recording method, and a reproducing apparatus capable of handling text information that can be displayed in synchronization with audio information (such as a song lyrics card) together with the audio information. About.
[0002]
[Prior art]
There is a DVD Audio standard as a method for recording text information, such as a song lyrics card, which can be displayed in synchronization with audio information on an information storage medium together with the audio information.
[0003]
According to this standard, audio information is recorded on an information storage medium in a packet (Audio Pack) format, and text information to be displayed in synchronization with the audio information is also converted into a packet format (Real-Time Information Pack). It is recorded on an information storage medium in a mixed manner with a voice information packet (Audio Pack). At the time of reproduction, the audio information and the text information are displayed in synchronization with the PTS (Presentation Time Stamp) in the packet header recorded together with the packet.
[0004]
[Problems to be solved by the invention]
Since the DVD Audio standard is a standard for a read-only information storage medium, it does not correspond to a user's editing process. For example, after the information in which the audio information and the text information based on the DVD Audio standard are mixedly recorded in the packet format is copied onto a rewritable information storage medium, editing such as partial deletion or division is performed based on the audio information. Is performed, the synchronization relationship between the voice information and the text information may be partially broken. As a result, after editing such as partial erasure or division based on audio information, there is a risk that text information synchronized with the audio information may not be displayed immediately after the start of reproduction, immediately before the end of reproduction, or at a switching point.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording medium, a recording method, and a reproducing apparatus for audio information in which a synchronous state of text information to be reproduced in synchronization with the audio information can be reliably and smoothly obtained.
[0006]
[Means for Solving the Problems]
To achieve the above object, according to the present invention, a basic recording medium has a recording area for audio information and a recording area for management information for managing the audio information, and a recording area for the audio information. Are a plurality of audio packs containing audio data, a plurality of real-time information packs containing text information to be reproduced in synchronization with the reproduction of the audio data, and the plurality of audio packs for each recording unit. And a plurality of real-time information packs, and as the second pack from the beginning, a plurality of audio objects in which the real-time information packs are arranged are recorded, and the recording area of the management information reproduces the audio data. Information used to control a playback device, wherein the audio object Object information including entry information to be specified, and synchronization information of a real-time information pack included in the object information and reproduced in correspondence with the audio object specified by the object information are recorded. It is configured. According to the above configuration, in the object, the real-time information pack can be read and encoded earlier.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. In the DVD Audio standard, audio information is packed and recorded in an audio pack (A_PCK), and text information reproduced in synchronization with the audio information is mixedly recorded in the form of Real Time Information Pack (RTI_PCK).
[0008]
In the first aspect of the present invention, the audio-related information recorded based on the DVD Audio standard is recorded as it is on a rewritable information storage medium (ST01). FIG. 7 shows the recording format of each information recorded on the information storage medium. The minimum rewritable unit in the rewritable information storage medium is 2048 bytes, and a pack is formed for each 2048 bytes, and a Pack Header 501 is arranged at the head of each pack. An SCR (System Clock Reference) value 512 for setting a system clock value of the information recording / reproducing apparatus is recorded in the Pack header 501.
[0009]
This embodiment has a structure in which only one packet is recorded in one pack, and is reproduced at the recording position of “various object data 505” shown in FIG. Text information is recorded. At the beginning of each packet, a Packet Header 503 and a sub_stream_id 504 are recorded, and a System Header 502 is arranged between them and the Pack Header 501.
[0010]
The type of information (such as voice information or text information) recorded in the recording area of various object data 505 is specified in the information contents of stream_id 522 and sub_stream_id 504. The display timing of each object data 505 is set by a PTS (Presentation Time Stamp) value 525, and by using the PTS value 525, synchronized display between audio information and text information can be performed.
[0011]
In the embodiment of FIGS. 1 (a) and 1 (b), text information of "Ando" is recorded in RTI_PCK # 1 and displayed at 4:00, and "san" is called. Text information is recorded in RTI_PCK # 2 and is to be displayed at 4:03. It has a minimum unit of audio information (Audio Object Entry) composed of one or more Audio Packs (A_PCK) as a management unit for audio information.
[0012]
In the embodiment shown in FIGS. 1 and 2, the time at which the voice information is displayed and the time at which the text information is switched at the boundary position of the minimum unit (Audio Object Entry) are set to match. The data structure in the management information recording area related to the audio information related information and the recording format of the audio information related information (Object information) are described in “Part 3 VIDEO RECORDING DVD Specifications for Rewritable / Re- recordable Discs ”.
[0013]
That is, as shown in FIG. 5, all audio information related information (Object information) recorded on the information storage medium is AR_AUDIO. ARO 221 is collectively recorded in a file, and the management information in the file is VR_MANGR. IFO 211 file and its backup file VR_MANGR. They are collectively recorded in the BUP 215 file. This VR_MANGR. IFO 211 file and VR_MANGR. The data structure in the BUP 215 file is as shown in FIG.
[0014]
The data structure shown in FIG. 4 is described in detail in “Part 3 VIDEO RECORDING DVD Specifications for Rewritable / Re-recordable Discs” issued by the DVD Forum in September 1999, and the description is omitted here. I do.
[0015]
In the embodiment of the present invention, the related information relating to the sound related information is collectively recorded in the Audio AV File Information Table 143 shown in FIG. An Audio Object (AOB) is configured for each recording unit, and is separately recorded as Audio Object Information # 1 166 to #j 167 for each AOB. FIG. 1D shows a data structure in one Audio Object Information #n.
[0016]
As described above, the audio information has a management unit called Audio Object Entry, and the data size (Data Size) 311 to 320 and the display time (Playback Time) 331 to 340 are recorded for each Audio Object Entry. For the lyrics of the song, plural types of text information such as “German”, “Japanese translation”, and “English expression” may be attached to the audio information.
[0017]
In FIG. 1D, the number of types of text information attached to the audio information is recorded in the number 307 of types of Real-Time Text. For example, when the number 307 of types of Real-Time Text set in FIG. 1D is designated as “g”, the audio information at the head position of each Audio Object Entry is simultaneously displayed at the time of display. Address Offsets 351 to 360 of RT_Text_Pack indicating a relative address value at which a Real-Time Information Pack (RTI_PCK) at which text information is recorded are recorded “g” at a time per Audio Object Entry.
[0018]
FIG. 8 shows the structure of the information recording / reproducing apparatus according to the present invention. FIG. 8 is a significant feature in that three individual STCs (System Time Clocks) used as reference clock counters during reproduction and display are provided, and audio information, text information, and still image information having different PTSs can be simultaneously reproduced. There is. A method of creating the information shown in FIG. 1D during recording will be described with reference to FIG.
[0019]
As shown in FIG. 9, the information recorded on the information storage medium is reproduced, and the information shown in FIG. 1D is created from the stream_id 522, the PTS value 525, and the recording position address information of each pack.
[0020]
In the embodiment of FIG. 1, the Audio Object Entry is divided in accordance with the display switching timing of the text information. However, as another embodiment of the present invention, the Audio Object Entry may be divided at a specific playback time interval. I can do it.
[0021]
The recording method at that time is shown in FIG. In this case, at the audio information reproduction time at the start position of the Audio Object Entry, text information may be being displayed. As shown in ST14 of FIG. 10, a Real-Time Information Pack position having a PTS immediately before the audio information reproduction time at the start position of each Audio Object Entry is searched for, and recorded as Address Offsets 351 to 354 of TR_Text_Pack. .
[0022]
FIG. 11 shows a method of reproducing audio-related information from the information storage medium having the management information according to the embodiment shown in FIG. When an Audio Object (AOB) number to be reproduced and a reproduction range are designated by time information (ST21), an access start address is calculated using the management information (ST22). At this time, the access address of the Audio Pack (A_PCK) and the access address of the Real Time Information Pack (RTI_PCK) are calculated, and the smaller address is determined as the calculated address.
[0023]
For example, when accessing from 4:03, the addresses of the respective packs displayed at this time are “P + Q” and “P + Q + 1” according to FIG. 1B, so that it is sufficient to access the younger “P + Q”. Become. If the user wants to start the reproduction from 4:10, the Real Time Information Pack (RTI_PCK) to be displayed at the same time is recorded for “P + T” for the Audio Pack (A_PCK) address displayed at 4:10. Since the address precedes "P + S + 2", the text information of RTI_PCK # 4 cannot be displayed when accessed from "P + T". Therefore, it is necessary to set the access destination address as “P + S + 2” as the younger address.
[0024]
In an editing process such as partial erasure or division / rearrangement of audio-related information in the embodiment of the present invention, basically, an Audio Object (AOB) is divided from a management file and then deleted from the file of the AOB after division. Performs processing and rearranges files. A partial erasing method according to the embodiment of the present invention will be described with reference to FIGS.
[0025]
As an example, a method of dividing AOB # n shown in FIG. 1 into three and deleting the first half and the second half will be described. The user designates the partial erasure range by the time information (ST31). The disk drive unit 409 stores the VR_MANGR. The IFO 211 file is reproduced (ST32), and the contents of the management information temporarily stored in the work RAM are rewritten in ST33 to ST39.
[0026]
In the Modified Recording time 302 of AOB #n in the Audio Object General Information 170 in FIG. 1D, only the time and minutes of the start of recording are described due to space on the paper surface, but in the embodiment of the present invention, recording is performed. The year and the recording date are recorded in the same place. Further, the ID number 301 for each AOB is recorded to clarify the relationship before and after editing, but the recording number 301 for each AOB within the same recording date may be recorded in this column.
[0027]
As shown in FIG. 2A, for example, when a part recorded before the reproduction time 4:05 is partially erased, the reproduction start time after the partial erasure is 4:05, so that the Audio Object Information in FIG. 3 is used. Like # m + 1, the modified recording time 382 of AOB # m + 1 is changed to 4:05 (ST33 in FIG. 12).
[0028]
As can be seen from FIG. 2A, there is a time difference of 5 minutes from the first recording start time at this time, so that the Original Recording time Difference 383 of Audio Object Information # m + 1 in FIG. 3 is 5 minutes. For example, if the first five minutes of the AOB (Audio Object) # m + 1 created as a result of editing this time are partially deleted, the Modified Recording time 382 is changed to 14:10, and the Original Recording time Difference 383 is further divided by 5 minutes. Add to 10 minutes. As a result, the time when recording was first started remains at 14:00.
[0029]
Therefore, the first recording start date and the recording start time of AOB # m + 1 are uniquely determined from the Modified Recording time 382 and the Original Recording time Difference 383, and this time information is kept unchanged even if editing is repeated many times. Dripping.
[0030]
The playback start time of AOB # m + 1 after the partial erasure is 4:05, and the address where Audio Pack # R-2 displayed at this playback time is recorded is "P + R". However, the address of RTI_PCK # 2 at which the text information being reproduced at 4:05 is recorded at an address position ahead of it by a difference of "RQ-1" (FIG. 12). ST34).
[0031]
Therefore, since this information needs to remain even after partial erasure, the Start address 384 of AOB # m + 1 becomes the address "P + Q + 1" where the Real-Time Information Pack # 2 is recorded as shown in FIG. ST35 in FIG. 12). The difference of the address where Audio Pack # R-2 to be reproduced first of AOB # m + 1 with respect to the start address of AOB # m + 1 is recorded in Start Address Offset 386, and becomes "RQ-1" in FIG. (ST36).
[0032]
The absolute value of this value matches the value of Address Offset 357 of RT_Text_Pack of Audio Object Entry # 1 176. Address Offset 357 of RT_Text_Pack indicates the polarity of the recording position direction of RT_Text_Pack # 2 based on the Audio Pack position at the head of Audio Object Entry # 1 176. In the embodiment of FIG. 2A, RT_Text_Pack # 2 is set to be “negative” since it is ahead of Audio Pack # R-2.
[0033]
Further, unnecessary portions of Audio Object Entry # 1 171 to # 4174 before partial erasure shown in FIG. 1D are deleted and partially rewritten to complete Audio Object Entry # 1 176 to # 3 178 shown in FIG. (ST38).
[0034]
When specific text information is deleted in the embodiment of the present invention, as shown in ST53 of FIG. 13, Object data 505 (FIG. 7 (FIG. 7) in the Real-Time Information Pack in which the text information to be deleted is recorded. b) Only the part is rewritten with the information of Object data 505 in the immediately preceding Real-Time Information Pack.
[0035]
In another embodiment of the present invention, the second means of the present invention, "2. When copying on a rewritable information storage medium, an audio information file (FIG. 14 in AR_AUDIO.ARO 221) and a real-time text information file (AR_RT_TEXT.ARO 222 in FIG. 14) composed of only text information packets, and a display time for text information in order to secure a synchronous relationship between the two. The management information is recorded in the management information recording area (FIGS. 14 to 20 correspond). "
[0036]
As shown in FIG. 16, when the object information (FIG. 16C), which is the audio-related information of DVD Audio, is copied to a rewritable information storage medium, the stream_id 522 shown in FIG. 7C is used. An Audio Pack or a Real-Time Information Pack is identified, and each is recorded in a separate file. As a result, according to the present embodiment, AR_RT_TEXT. ARO 222 files are added.
[0037]
Further, according to this embodiment, the data structure of the management information is different from that of FIG. 4 in that Real-Time Text AV File Information 159 is added as shown in FIG. 15, and the time management information in FIG. As shown, information of a series of Real-Time Text Object Entry # 1 191 to #h 198 is added.
[0038]
As shown in FIG. 17 (c), in this embodiment, one or more Real-Time Packs in which text information is recorded are collected and referred to as Real-Time Text Object Entry # 1 191 to # 3 193 as a management unit. The display time and data size of each Real-Time Text Object Entry # 1 191 to # 3 193 are managed (FIG. 17D). As shown in FIG. 18, the recording method based on this embodiment is divided into recording an audio pack on an information storage medium (ST61) and recording a Real-Time Information Pack (ST62).
[0039]
In this embodiment, AR_AUDIO. A file called ARO 221 and AR_RT_TEXT. It is necessary to sequentially reproduce information recorded in different positions of the ARO 222 file, and to simultaneously reproduce voice and text. Therefore, AR_RT_TEXT. A large part of this embodiment is that a part of the information in the ARO 222 file is reproduced first, transferred to the RT_Text decoding unit 429 (FIG. 8) (ST75), and the Audio Pack is simultaneously displayed while reproducing (ST79). It is a feature.
[0040]
In the case of this embodiment, an information recording / reproducing apparatus that performs only recording, reproduction, and editing of an audio pack is used as an AR_AUDIO. ARO 221 file is partially erased, and AR_RT_TEXT. Synchronization with the ARO 222 file may be lost. In this case, it is necessary to restore this synchronization relationship with an information recording / reproducing apparatus having a function of displaying text information.
[0041]
The difficulty in repairing the synchronization relationship when using compressed audio information will be described with reference to FIG. It is assumed that AOB # 1 was first recorded at 14:00 on the same day (recording number 301 = 1), and then AOB # 2 was started recording at 14:30 as the next recording (recording number 301 = 2).
[0042]
The Modified Recording time at this time is 14:00 and 14:30, respectively. When AOB # 1 is recorded in a compressed state, the reproduction time may be much longer than the time required for recording. Therefore, when AOB # 1 is continuously reproduced, the first half may be partially erased at a reproduction conversion time of 14:45. The Modified Recording time after this editing is 14:45, which is later than the Modified Recording time 14:30 of AOB # 2.
[0043]
As described above, in the information including only the AOB number and the modified recording time, the AR_AUDIO. After partially erasing only the ARO 221 file, it is difficult for an information recording / reproducing apparatus having a function of displaying text information to restore this synchronization relationship.
[0044]
Therefore, according to the embodiment of the present invention, the recording start date and time information which has the ID number or the recording number 301 within the same recording date and the Original Recording time Difference 303, and is kept unchanged even if edited many times, AR_AUDIO. The information in the ARO221 file and AR_RT_TEXT. It is possible to repair the synchronization relationship of the information in the ARO 222 file.
[0045]
FIG. 20 shows a specific relationship restoration method. As shown in ST94 of FIG. 20, an Audio Object that matches the first recorded time is searched, and the content of the management information is changed according to the editing status of the Audio Object (ST96), and the AR_RT_TEXT. An unnecessary portion of the ARO 222 is deleted.
[0046]
【The invention's effect】
As described above, the effects of the present invention are summarized as follows.
[0047]
1. By having the synchronization information between the Audio Object and the Real-Time Text Object, access can be made faster and editing processing such as partial erasure and division can be performed at high speed.
[0048]
In the case of the method shown in FIGS. 1 to 5 and FIGS. 9 to 13, Address Offsets 351 to 360 of RT_Text_Pack correspond to the synchronization information between the Audio Object and the Real-Time Text Object, and are shown in FIGS. 14 to 20. In the system, the combination of the management information of the playback time of the Audio Object Entry 171 to 179 and the management information of the playback time of the Real-Time Text Object Entry 191 and 192 corresponds to the synchronization information between the Audio Object and the Real-Time Text Object.
[0049]
When performing special playback such as time search, fast forward, or rewind that starts playback from the specified specific playback time, the address where the audio information and text information to be displayed at the specified time are recorded from the management information And it is possible to access the minimum necessary address. As a result, in the disk drive unit 400, the access to the information storage medium 400 is accelerated, and not only the cueing speed in the time search is increased, but also the text information can be displayed at a very high speed fast forward or rewind.
[0050]
At the time of editing such as partial erasure and division, audio object (AOB) division processing is required as shown in FIGS. 2 and 3. However, as in the present invention, audio object and real-time are stored in the management information recording area. Since the synchronization information between the Text Objects is stored, the address at which the audio information and the text information to be displayed at an arbitrary reproduction time are recorded by simply searching the information in the management information recording area can be obtained. The position of the dividing boundary of the edited Audio Object (AOB) can be known.
[0051]
Therefore, according to the present invention, the division boundary position at the time of editing can be determined only by examining the synchronization information recorded in the management information recording area without searching for the Object File in which the voice information and the text information are recorded, and the editing process is performed. Can be performed at high speed.
[0052]
2. As in the embodiment of the present invention, Real-Time Text information is recorded in a pack format, and the information in the pack can be displayed in synchronization with a management unit (Audio Object Entry) of audio information constituting a plurality of Audio Object Packs. By doing so, it is possible to very easily perform special playback processing such as time search, high-speed playback, and rewinding.
[0053]
3. As shown in FIG. 19, if the method of displaying the text information and the voice information at the same time after pre-reading the text information is adopted, the sound cutoff that occurs when accessing the voice information or the text information (the phenomenon that the reproduction of the voice information stops) ) And the display of the text information can be continuously performed without causing the display delay of the text information.
[0054]
4. An information recording / reproducing apparatus that records, reproduces, and edits only audio information without displaying text information performs editing processing such as partial erasure or rearrangement of only audio information when using the method shown in FIGS. There are cases.
[0055]
In the case where the information storage medium after the editing processing by the audio-only device is applied to the information recording / reproducing apparatus which also performs the display processing of the text information, the corresponding Real Time Text Object is used as in the embodiment of the present invention. By providing the information for enabling the restoration of the synchronization relationship (the time information at which the recording was first started) in the management information of both the voice information and the text information, the synchronization relationship can be restored by the method shown in FIG.
[Brief description of the drawings]
FIG. 1 is a view for explaining an embodiment of the present invention and is a view for explaining a recording position relation and a display timing relation on an information storage medium between an audio object and a real time text object.
FIG. 2 is an exemplary view for explaining a relationship between divided audio objects according to the embodiment;
FIG. 3 is an exemplary view for explaining a relationship between the divided audio objects according to the embodiment;
FIG. 4 is an exemplary view for explaining a data structure relating to audio information recorded in a disk-shaped information storage medium according to the embodiment;
FIG. 5 is an exemplary view showing a directory structure of an audio file in which recordable audio information is recorded in the information storage medium in the embodiment.
FIG. 6 is a view for explaining the necessity of setting a recording number or an ID number within the same recording date as Original Recording time Difference for each Audio Object in the embodiment.
FIG. 7 is an exemplary view for explaining a recording format of each Object information in the information storage medium according to the embodiment;
FIG. 8 is a block diagram showing a structure in the information recording / reproducing apparatus according to the embodiment;
FIG. 9 is an exemplary flowchart for explaining a method of recording audio information on an information storage medium when the Audio Object Entry is divided at the display start timing of Real Time Text in the embodiment.
FIG. 10 is an exemplary flowchart for explaining a method of recording audio information on an information storage medium in a case where an audio object entry is divided at a specific reproduction time interval according to the embodiment;
FIG. 11 is a flowchart shown to explain a method of reproducing audio-related information from the information storage medium in the embodiment.
FIG. 12 is a flowchart shown to explain partial erasure relating to audio-related information in the embodiment.
FIG. 13 is a flowchart shown to explain a method of erasing text information of a specific part in the embodiment.
FIG. 14 is a view for explaining another embodiment of the present invention and illustrating a directory structure of audio files and text related to recordable audio information recorded in an information storage medium.
FIG. 15 is a diagram illustrating a data structure related to audio information recorded in a disc-shaped information storage medium according to another embodiment;
FIG. 16 is a view for explaining a data structure in an Object File according to the other embodiment;
FIG. 17 is a diagram illustrating a data structure in Real-Time Text Object Information according to the other embodiment;
FIG. 18 is a flowchart illustrating a method of recording audio-related information on an information storage medium according to another embodiment.
FIG. 19 is a flowchart illustrating a method for reproducing audio-related information from an information storage medium according to another embodiment.
FIG. 20 is a flowchart illustrating a method for restoring a relationship between Audio Object Information and AR_RT_Text Object Information according to another embodiment;
[Explanation of symbols]
400 ... information storage medium,
401 ... encoder section,
402 ... decoder section,
409: Disk drive unit.

Claims (3)

It has a recording area for audio information and a recording area for management information for managing the audio information,
The recording area of the audio information includes a plurality of audio packs storing audio data, a plurality of real-time information packs storing text information to be reproduced in synchronization with the reproduction of the audio data, and a recording unit for each recording unit. The plurality of audio packs and the plurality of real-time information packs are combined, and a plurality of audio objects formed by arranging the real-time information packs are recorded as the second pack from the beginning,
The recording area of the management information is information used to control a playback device that plays back the audio data, and includes object information including entry information specifying each of the audio objects, and is included in the object information. A recording medium configured to record the audio object specified by the object information and synchronization information with a real-time information pack to be reproduced corresponding to the audio object, and readable by an audio information processing apparatus. A method of recording the audio information and the management information on an information recording medium having a recording area for audio information and a recording area for management information for managing the audio information,
Generate multiple audio packs containing audio data,
Generate a plurality of real-time information packs containing text information to be reproduced in synchronization with the reproduction of the audio data,
The plurality of audio packs and the plurality of real-time information packs are collected for each recording unit, and a plurality of audio objects formed by arranging the real-time information packs are generated as a second pack from the beginning,
Recording the audio object in a recording area of the audio information,
Generating object information, which is information used to control a playback device that plays back the audio data, including entry information that specifies the audio object,
As included in the object information, generate synchronization information between the audio object specified by the object information and a real-time information pack to be reproduced corresponding to the audio object,
A method for recording audio information, wherein the object information is recorded in the management area. A reproducing apparatus that reproduces the audio information in a recording area in which the audio information is recorded, with reference to management information in a management area of a recording medium,
The recording area of the audio information includes a plurality of audio packs storing audio data, a plurality of real-time information packs storing text information to be reproduced in synchronization with the reproduction of the audio data, and a recording unit for each recording unit. The plurality of audio packs and the plurality of real-time information packs are combined, and a plurality of audio objects formed by arranging the real-time information packs are recorded as the second pack from the beginning,
The recording area of the management information is information used to control a playback device that plays back the audio data, and includes object information including entry information specifying each of the audio objects, and is included in the object information. The audio device specified by the object information and the synchronization information with the real-time information pack to be reproduced corresponding to the audio object are configured to be recorded.
Means for reading the management information and accessing and reading the predetermined audio object;
Transferring a read real-time information pack, which is at least a second pack of the predetermined audio object, to a code part in real-time text;
Means for transferring the read audio pack of the predetermined audio object to an audio decoding unit.

Images