JP3773107B2 - Audio playback method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an audio reproduction method for a storage medium, and more particularly to an audio reproduction method for a storage medium in which a large number of audio packs are recorded for each track and text information packs are discretely recorded between the audio packs.
[0002]
[Prior art]
Currently, the DVD-Audio standard includes information such as “still picture information”, “moving picture information”, and “text information”. Among them, “text information” includes centralized recording type “static text information” and real-time type “dynamic text information (real-time information)”. This “dynamic text information” is recorded in the audio data recording area, and the text information can be read and displayed in synchronization with audio reproduction. Therefore, if the “dynamic text information” is music lyrics, the lyrics can be displayed on the display device while the music is being reproduced.
[0003]
[Problems to be solved by the invention]
Conventionally, the dynamic text information such as lyrics is read and displayed in synchronization with the reproduction of audio data.
From the above, an object of the present invention is to specify a playback position using dynamic text information and to enable playback to start from the position.
Another object of the present invention is to improve the playability of DVD-Audio.
[0004]
[Means for Solving the Problems]
The present invention is an audio playback method for a storage medium in which a large number of audio packs are recorded for each track and text information packs are discretely recorded between the audio packs. ( 1 ) Text included in a text information pack The text information is stored in a memory so that an audio pack including audio data corresponding to the information can be specified, ( 2 ) the lyrics of the music song are displayed according to the text information of a predetermined track, and ( 3 ) two predetermined locations When the lyric part is instructed, the audio data is reproduced from the audio pack corresponding to the text information of the lyric part.
[0005]
In this way, it is possible to specify a playback position using dynamic text information and start playback from that position, or perform repeated playback. Also, when two text information parts are designated, audio data between them can be reproduced or repeatedly reproduced. As a result, the playability of DVD-Audio can be improved.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
(A) Configuration of DVD Player FIG. 1 is a configuration diagram of a DVD player, 10 is a DVD disc placed on a turntable, 11 is a disc changer, 12 is a spindle motor that rotates the turntable at a constant peripheral speed, 14 is an optical pickup that reads data from a DVD disk, 16 is a feed motor that sends the pickup in the disk radial direction, 18 is a servo control unit that performs tracking servo control, focus servo control, and constant peripheral speed control, and 22 is read by the pickup. RF amplifier that amplifies the signal, 24 is a digital signal processing unit that performs digital signal processing (demodulation, error correction, descrambling, etc.) on the RF signal and outputs it as a data stream, 26 is a RAM, 30 is an input data stream This is a stream separation unit that separates an audio stream, a video stream, and a sub-picture stream.
[0007]
32 is an audio decoder that converts compressed audio data into PCM audio data, 34 is RAM, 36 is a video decoder that converts compressed video data into video data, 38 is RAM, and 40 is compressed sub-picture data into sub-picture video data. Sub-picture decoder for conversion, 42 for RAM, 44 for video processor for processing various video signals, 46 for character image generator for generating character image, 47 for display device, 48 for DA converter, 49 for speaker, 58 for An operation unit 60 is a system controller.
[0008]
The system controller 60 performs various types of control, but is playback control using dynamic text information (real-time information) as control related to the present invention. That is, the dynamic text information (for example, song lyrics) recorded in the audio data storage area of the DVD-Audio is collected and stored in the memory 60a, and the lyrics are displayed as shown in FIG. 47, and playback control from the instructed lyrics portion is performed.
[0009]
(B) Logical Data Structure of DVD-Audio Disc FIG. 3 is an explanatory diagram of the logical data structure of the DVD-Audio disc. The DVD-Audio disc is composed of (1) DVD volume zone, (2) DVD audio zone for recording audio content, (3) DVD video zone for recording video content, and (4) DVD other zone. An in-area and lead-out area are provided.
In the DVD audio zone, (1) simple audio manager SMG, (2) audio manager AMG, (3) audio still video set ASVS, and (4) one or more (up to 99) audio title sets ATS are recorded.
[0010]
Since DVD-Audio has a large capacity, it can record a large number of tracks corresponding to a plurality of CD albums. For this reason, in order to improve accessibility, a new access unit Group is defined by collecting tracks (songs) to be reproduced continuously. This Group is a logical unit that can be continuously played back by sequentially connecting one or more audio titles ATT. The audio title set ATS corresponds to one group and defines an audio-only title AOTT defined by the navigation data and audio object (AOB) in the ATS or the audio data of the navigation data and video object (VOB) in the ATS. Is a logical unit.
That is, the audio title set ATS includes (1) audio title set information ATSI, (2) AOTT audio object set (AOTT-AOBS) which is an aggregate of AOTT audio objects (AOTT-AOBS), and (3). ▼ Consists of ATSI backup ATSI (Back Up).
[0011]
As shown in FIG. 4, the AOTT audio object set AOTT-AOBS is an aggregate of a plurality of AOTT-AOBs (AOTT audio objects), and one AOTT-AOB corresponds to one track. AOTT-AOB consists of a number of audio cells ATS-C, and each audio cell ATS-C consists of multiple audio packs A-PCK, which are audio data, and real-time information (dynamic text information) in place. Real-time pack RTI-PCK is inserted. The real-time information is, for example, lyrics, and a real-time pack RTI-PCK including the lyrics part is inserted at a proper position of the audio cell ATS-C corresponding to the lyrics part.
[0012]
One pack is 2048 bytes, and the first pack of the AOTT audio object AOTT-AOB has the structure shown in FIG. 5A, and the other pack has the structure shown in FIG. The first pack includes (1) a 14-byte pack header, (2) an 18-byte system header, (3) 2016 bytes of audio data or real-time information. Packs other than the first pack include (1) a 14-byte pack header, (2) 2034 bytes of audio data or real-time information.
[0013]
The system header includes a system start code, a header length, and the like, and the pack header includes a pack start code, an SCR (System Clock Reference), and the like. Therefore, whether or not it is the leading pack can be identified by detecting the system start code, and the packs can be separated from each other by detecting the pack start code. Further, since the SCR has a pack-specific time, the pack can be specified based on the SCR.
[0014]
As described above, since each pack can be separated and an SCR having a specific time is included in the pack header, real-time information (lyrics) read at the time of reproduction of a predetermined track is changed from (1) from the beginning. Corresponding to the pack number or {circle around (2)} SCR is stored in the memory 60a as shown in FIG. When the audio cell ATS-C is composed of a certain number of packs, the audio cell ATS-C can be separated by counting the number of packs, as shown in FIG. Real-time information (lyrics) of the real-time pack is stored in correspondence with the audio cell ATS-C including the real-time pack RTI-PCK.
[0015]
(C) Reproduction Control FIG. 7 is a flowchart of the reproduction control of the present invention. A case will be described in which, after a predetermined track (song) is reproduced, a desired lyric part is designated and reproduced from the lyric part. Further, it is assumed that the audio cell ATS-C including the real-time pack RTI-PCK can be identified.
The system controller 60 stores the lyrics of the real-time pack RTI-PCK read during playback of a predetermined track in the memory 60a in correspondence with the number of the audio cell ATS-C to which the real-time pack RTI-PCK belongs (FIG. 6 ( b), Step 101). The album name, artist name, and track number of the track are also saved.
[0016]
Next, when the designated lyrics reproduction of a predetermined track is instructed from the operation unit 58, the system controller 60 reads the album name, artist name, track number, and lyrics of the designated track from the memory 60a and inputs them to the character image generation unit 46. To do. The character image generating unit 46 generates a character image composed of the input album name, artist name, track number, and lyrics, and displays it on the display device 47 via the video processor 44 (step 102).
Thereafter, the system controller 60 waits for the lyric part, that is, the playback location to be selected (step 103), and if the user indicates the lyric part desired to be played with the cursor CSR as shown in FIG. Is input (step 104). The playback type is one of playback once and repeated playback.
[0017]
When the user inputs the reproduction type, the system controller 60 obtains the number of the audio cell ATS-C corresponding to the lyrics instructed in step 103 from the memory 60a. Next, the servo control unit 18 is controlled to position the optical pickup 14 at the head audio pack A-PCK of the audio cell ATS-C. Thereafter, the audio packs after the audio pack A-PCK are read out and reproduced according to the designated reproduction type (step 105).
[0018]
In the above, the audio cell ATS-C including the real-time pack RTI-PCK can be identified. If the audio cell ATS-C cannot be identified, the information in FIG. Since it is stored in 60a, the pack number of the real-time information pack RTI-PCK is obtained from the memory, the optical pickup 14 is positioned in the audio pack A-PCK several before the number, and the subsequent audio pack is read out, Playback is performed according to the specified playback type. Alternatively, the SCR of the real-time information pack RTI-PCK is obtained from the memory 60a, the optical pickup 14 is positioned at the audio pack A-PCK having an SCR value close to the SCR, the subsequent audio pack is read, and according to the instructed playback type Perform playback.
[0019]
(E) In the above modification, the present invention is the case where the lyrics are stored in DVD-Audio together with the audio data (music). However, the present invention can also be applied to the case where the audio data (conversation) is stored in language text.
The above is a case where the lyrics portion is designated at one place, but it is possible to designate two places and reproduce the audio data between them, or to repeat the reproduction.
In the above description, a case has been described in which a predetermined track (song) is reproduced and then a desired lyrics portion of the track is designated and reproduced from the lyrics portion. However, the present invention is not limited to a reproduced track. For example, the track is pre-read and real-time information (lyrics) of the real-time pack is stored in the memory 60a, and the lyrics of the designated track are displayed.
[0020]
【The invention's effect】
As described above, according to the present invention, it is possible to specify a playback position using text information and to start playback from the position or to perform repeated playback. In addition, it is possible to specify two places in the text information portion and reproduce the audio data between them or to reproduce it repeatedly, thereby improving the playability of DVD-Audio.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a DVD player.
FIG. 2 is a display example of dynamic text information (for example, lyrics of a song).
FIG. 3 is an explanatory diagram of a logical data structure of a DVD-Audio disc.
FIG. 4 is a configuration diagram of an AOTT audio object set AOTT-AOBS.
FIG. 5 is a block diagram of an audio object for AOTT.
FIG. 6 is an example of lyrics storage.
FIG. 7 is a processing flow of reproduction control according to the present invention.
[Explanation of symbols]
10 DVD disk 24 digital signal processing unit 32 audio decoder 47 display device 60 system controller 60a memory

Claims (1)

In an audio reproducing method for a storage medium in which a large number of audio packs are recorded for each track and text information packs are discretely recorded between the audio packs.
Storing the text information in a memory so that an audio pack including audio data corresponding to the text information included in the text information pack can be identified;
Displays the lyrics of music songs based on the text information of a given track,
When lyrics part of the predetermined two positions is instructed, it reproduces the audio data from the audio pack corresponding to between text information of the lyrics portion,
A method of reproducing a storage medium characterized by the above.

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