JP3340384B2 - DVD audio disc and apparatus and method for reproducing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for reproducing a DVD disk, and more particularly, to an apparatus and method for reproducing a DVD audio disk and a DVD audio disk.

[0002]

2. Description of the Related Art Generally, audio data recorded on a CD (Compact Disc) is sampled at 44.1 KHz, and each sample is a linear PCM quantized to 16 bits.
Audio data (Linear Pulse Code Modulation audi
o data). Then, the reproducer reads out the digital data recorded on the CD, converts it into an analog signal, and reproduces it. The above-mentioned CD has an advantage that it can be used and stored more easily than the previous LPs, but there are also opinions that the sound quality is inferior to the analog LP. That is, when audio data sampled at 44.1 KHz and quantized to 16 bits is reproduced, there is a problem in that it is difficult to reproduce the original sound and the sound quality may be deteriorated as compared with a disc used in a CD previous generation. In fact, the human audible range can be above 20 KHz and the dynamic range should be above 120 dB. In addition, since the CD can record only audio signals of up to two channels, it is not possible to record and reproduce audio data related to multi-channel music, which is of increasing interest at present. there were.

Accordingly, there has been proposed a method for improving the quality of reproduced sound by increasing the sampling frequency of audio data and increasing the number of recording channels. Also, recently, one disc reproducing apparatus is designed to be able to reproduce various types of discs. Such disks include DVDs (Digital Versatile Discs).
The DVD records video data and audio data at high density, and the video data is MPEG (Moving Pict
ure Expert Group) format, and audio data is recorded in linear PCM (Linear Pulse Code Modulation) format, Dolby AC-3 format, MPEG
Record in format etc. The apparatus for reproducing the DVD video disk has a configuration for reproducing video data and a configuration for reproducing audio data.
The video and audio data recorded on the VD video disc are reproduced.

[0004] At this time, the standard is created on the assumption that the DVD video contains video data, so that if the DVD video is used exclusively for audio, the disk space is wasted. As described above, audio data recorded on a DVD video disc has better sound quality than audio data recorded on a CD audio disc. That is, the DVD
The audio data recorded on the disc has a higher sampling frequency, a larger number of quantization bits, and a larger number of channels than the audio data recorded on the CD audio disc. Therefore, the DVD reproducing apparatus can reproduce high-quality audio data on multiple channels.

The DVD disk has a maximum of 10.08 Mb.
Data transmission of ps is possible. Calculating based on this, the sampled data of 192 KHz is also 2
It can be seen that channel reproduction is possible. Further, such a value is close to the maximum sampling frequency specified as a requirement necessary for next-generation audio at an ADA conference (Advanced Digital Audio Conference) held in April 1996 in Japan. Accordingly, when pure audio data is recorded on the DVD disk and the DVD reproducing apparatus reproduces the DVD audio disk, an audio signal with better sound quality can be reproduced.

[0006]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to convert a digital audio signal sampled using a maximum sampling frequency and a maximum number of quantization bits into a linear PCM system up to the number of channels limited by the data transmission rate. It is another object of the present invention to provide a DVD audio disc which can be recorded by a DVD. Another object of the present invention is to
A DVD audio disc capable of recording and compressing a digital audio signal sampled using the maximum sampling frequency and the maximum number of quantization bits by a setting method and recording up to the number of channels limited by the data transmission speed and the encoding method. To provide.

Another object of the present invention is to provide an apparatus and a method capable of reproducing a DVD audio disc recorded in a linear PCM system. It is still another object of the present invention to provide an apparatus and a method for reproducing a DVD audio disc storing compression-encoded audio data. It is still another object of the present invention to provide an apparatus and a method capable of discriminating a DVD video disc and a DVD audio disc by a DVD reproducing apparatus and reproducing the DVD video disc or the DVD audio disc according to the discrimination result.

[0008]

In order to achieve the above object, a DVD-Audio disc apparatus according to the present invention has a video_TS and an audio_TS directory in a disc information area, and an AMG location information in the audio_TS directory. Is recorded in the AMG, and the audio title is sequentially connected to ATSI_MAT and a number of AOBs. The audio stream attribute of the ATSI includes an audio encoding mode and a first encoding mode. The decoding algorithm information related to the third to third quantization bits, the first to third sampling frequencies, and the number of audio channels is recorded. Odeta is characterized in that it is composed of audio pack stored.

According to an embodiment of the present invention, there is provided an apparatus for reproducing DVD audio, comprising: a data receiving unit for receiving audio data reproduced from the disc; If valid data is present, the audio data is detected as DVD audio, and information of the received audio data is analyzed to generate an audio control signal including an audio encoding mode, a sampling frequency, the number of channels, and quantization information. A control unit for interrupting reproduction control if there is no valid data in the audio_TS, and a plurality of decoding units, and a corresponding decoding unit is selected by the audio control signal to decode received audio data. And
An audio decoder that performs multi-channel mixing, sampling frequency conversion, and requantization processing on the decoded audio data based on the audio control signal, and audio that converts the decoded audio data into an analog audio signal and outputs the analog audio signal And an output unit.

According to the present invention, there is provided D
The VD audio playback method uses the audio_T
AM when valid data is recorded in the S directory
After grasping the position of G, confirming the entire information of the disc from the information of the AMG, and grasping the position of the corresponding audio title based on the position information of the AMG at the time of title reproduction request, reading the data of the corresponding audio title position , Reads the ATSI_MAT, and reads the ATSI_MAT.
An audio decoder is set so as to read a MAT audio stream attribute and perform a reproduction algorithm for reproducing the audio title, and then reproduce the audio title.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A DVD video that records and reproduces video and sound that surpasses LD at present by using DVD, which has been in the limelight, as a next-generation recording medium has been commercialized and can be reproduced. DVD playback devices have also appeared.
The present invention uses the high recording capacity of the DVD to produce CDs and Ds.
The present invention relates to a digital audio disk (hereinafter referred to as DVD audio) capable of recording and reproducing high-quality audio data exceeding digital audio performance such as an AT (Digital Audio Tape), and an apparatus and method capable of reproducing DVD audio. Here, the DVD audio has a standard similar to that of the DVD video. Accordingly, the DVD audio is divided into a data area for recording audio data to be actually reproduced and an information area for recording information on the data area. In addition, D
The VD playback device can implement a DVD audio playback device that plays back only the inserted DVD audio and a DVD-A / V playback device that can play back both DVD audio and DVD video.

The DVD audio reproducing apparatus and DVD
-The A / V playback device was able to play the inserted DVD in the appropriate format after judging whether the inserted DVD was DVD audio or DVD video. The DVD audio according to an embodiment of the present invention uses most of the structure of the DVD video and changes the structure of the audio data to record high quality audio data. In the embodiment of the present invention, the structure of the DVD audio and the operation of reproducing data recorded on the DVD audio will be considered.

The basic file structure recorded in the DVD audio information area has a structure as shown in FIG. FIG. 1 shows a directory structure of DVD audio and DVD video. FIG. 1
, The directory of the DVD is video_TS
(VIDEO_TS) and audio_TS (AUDI
O_TS) and a user area (User defined). Each directory has a file of which file name shall be assigned.
d) is concatenated. The directory structure indicates the location of each file on the disk. The VIDEO_TS
The files connected to the directory have a file structure for a DVD video and playback device currently being commercialized, and the files connected to the AUDIO_TS directory have a file structure for a DVD audio and playback device.

Here, the DVD video and the DVD audio are respectively stored in a VIDEO_TS directory and an AU
Includes all DIO_TS. At this time, the DVD video has an AUDIO_TS directory.
The O_TS directory includes an empty directory in which nothing is recorded. However, the D
In the VD audio, the position information of the title recorded on the disc is recorded in the AUDIO_TS directory, and the VIDEO_TS also records the position information for the title of the information (spec: for example, sampling frequency) that can be reproduced by the DVD video reproducing apparatus. Have been. Therefore, the discrimination of the DVD disc is performed by AUDIO_
It can be determined by checking whether valid data is recorded in the TS. That is, at the time of disc discrimination, the AUDI
If there is no valid data in O_TS, DVD video is output. If there is valid data in AUDIO_TS, D
It becomes VD audio. Therefore, the DVD playback device has a D
When the VD is inserted, the state of the directory is confirmed, and it can be determined whether the inserted disc is DVD audio or DVD video.

In FIG. 1, a DVD video logical data structure (logical d) linked on a DVD video directory is shown.
ata structure of DVD-Video). The logical data structure of the DVD video includes a structure of a volume space and a video management structure (s).
tructure of Video Manager: Hereafter "VMG")
And the video title set structure (structure of Video T)
itle Set: hereinafter, referred to as “VTS”) and a structure of Video Object Set:
Hereinafter, referred to as “VOBS”). FIG. 2 shows the DV
2 shows a logical data structure of D video. Referring to FIG. 2, the volume space of a DVD disc has a volume and file structure, a single DVD video zone (DVD-Vid
eo zone) and DVD-others zone
Etc. The DVD video zone to which the DVD video data structure is assigned is one V
The MG and at least one to up to 99 VTSs can be allocated. The VMG is located at the front of the DVD video zone and is composed of two or three files. The VTS is composed of at least three files and up to twelve files.

FIG. 3 shows a VMG (Video Manager) and a VTS
FIG. 4 is a diagram showing the structure of (Video Title Set), where all VO
B (Video Object) is a contiguous block
2 shows an example of the form recorded in the example. The VOB includes data such as video, audio, and sub-picture. Referring to FIG. 3, the VM
G is the control data VMGI (Video Manager Informatio
n) File and VOB menu (VMGM_VOB)
S) It consists of a file and a VMGI backup file. The n VTSs are the control data VTSs.
I, VOB menu (VTSM_VOBS), and V
OB title (VTSTT_VOBS) and VSTI
Consists of backup files. The VT
STT_VOBS is composed of a number of C_IDNs.
Here, C_DIN # indicates the cell ID number in the VOB, and VOB_IDN # indicates the VOB ID number in the VOB.

FIG. 4 is a view showing the structure of the VMGI shown in FIG. 3, and includes information on an associated VIDEO_TS directory. As shown in FIG. 4, the VMGI is a VMGI_MAT (Video Manager Information Manager).
ent_Table), TT_SRPT (Title Searc
h Pointer Table), VMGM_PGCI_UT (VideoMa
nager Menu PGCI Unit Table), PTL_MAIT (Pare
ntal Management Information Table), VTS_ATR
T (Video Title Set Attribute Table), TXTDT_
MG (Text Data Manager), VMGM_C_ADT (Vide
o Manager Menu Cell Address Table), VMGM_VO
BU_ADMAP (Video Manager Menu Video Object Un
It Address Map) will follow. FIG. 5 shows the VMGI
3 shows the structure of TT_SRPT. The TT_SR
The PT includes search information for a video title under the VIDEO_TS directory. The TT_SRPT is TT_S
TT_SPRTI (Title Search Pointer) of RPT information
Table Information) and n title search pointers TT_SRP # (Title Search Pointer for Ti
tle #) follows one after another in numerical order. Here, the TT
_SRPT # has a size of 0 to 99.

FIG. 6 shows video title set information VTSI (Video Title) located before each VTS shown in FIG.
Set Information). Referring to FIG. 6, the VTSI includes one or more video titles and a video title set menu VTSM (VSM).
ideo Title Set Menu) information. The VTSI includes management information of each title. Here, the title management information is information for searching for PTT (Part_of_Title),
Information for playing back VOB, VTSM information, and VOB
Has information on the attributes of FIG. 6
As shown in the figure, the VTSI is VTSI_MAT (Video
Title Set Information Management Table), VTS_PTT_SRPT (VideoTitle Set Part_o
f_Title Search Pointer Table), VTS_PGCIT
(VideoTitle Set Program Chain Information Table),
VTSM_PGCI_UT (Video Title Set Menu PGCI
Unit Table), VTS_TMAPT (Video Title SetTi
me Map Table), VTSM_C_ADT (Video Title Se
t Cell Menu AddressTavle), VTSM_VOBU_A
DMAP (Video Title Set Menu Video ObjectUnit Add
ress Map), VTS_C_ADT (Video Title Set Cell)
Address Table), VTS_VOBU_ADMAP (Vide
o Title Set Video Object Unit Address Map) will follow.

FIG. 7 shows a DVD title video title set information management table VTSI_MAT (Video Title Set).
Information Management Table).
The VTSI_MAT indicates each information of the VTSI and the start address of the attribute of the VOBS in the VTS. In the VTSI_MAT having the structure as shown in FIG. 7, the VTS_AST_AT of RBPs 516 to 579
RT (Audio Stream attribute table of VTS)
VTS_ of eight audio streams as in (a)
AST_ATR # 0 to # 7 RBP are stored and each V
TS_AST_ATR is composed of 8 bytes having a structure as shown in FIG. 8B, and the value of each field is VTSM_
It becomes information inside the audio stream of VOBS.

Next, referring to FIG.
Let's examine the structure of AST_ATR. First, b63-b
Audio encoding mode (audio codin
g mode) is shown in Table 1 below.

[Table 1] Second, multi-channel extension of b60
nsion) is an area for storing multi-channel extension presence / absence information. When 0b is recorded, it means that the multi-channel extension function is not selected, and when 1b is recorded,
The multi-channel extension function is performed according to the information of VTS_MU_AST_ATRT recorded in RBP792 to 983 of VTSI_MAT in FIG. Second, Table 2 below shows audio types b59 to b58.

[Table 2] Fourth, b57 to b56 audio application modes (audio a
pplication mode) is as shown in Table 3 below.

[Table 3]

Fifth, quantization information (Qua) is stored in b55 to b54.
ntization / DRC) is stored as follows. If the audio encoding mode is “000b”, 11b is recorded. And the audio encoding mode is 010b
Or 011b, the quantization information is defined as follows. 00b: Dynamic range control data does not exist in the MPEG audio stream. 01b: Dynamic range control data exists in the MPEG audio stream. 10b: reserved 11b: reserved

If the audio encoding mode is 100b, the quantization information is stored as shown in Table 4 below.

[Table 4] Sixth, b53 to b52 representing the sampling frequency fs are as shown in Table 5 below.

[Table 5] Seventh, b50 to b48 representing the number of audio channels are as shown in Table 6 below.

[Table 6]

In the VTSI_MAT of FIG. 7, the VTS_MU_AST_RBP 792-983
ATRT (Multichannel Audio stream attribute table
ofVTS) stores VTS_MU_AST_ATR # 0 to # 7RBP of eight audio streams as shown in FIG. And, each VTS_MU_AST_AT
RT is an 8-byte VTS_MU_AST as shown in FIG.
_ATR (1) and 16-byte VTS_M as shown in FIG.
U_AST_ATR (2).

As described above, the DVD video information area V
IDEO_TS is configured as shown in FIGS. 2 to 11, and such an information area is located in a DVD video disc information area. Since the DVD video records video data and audio data as described above, high quality audio data cannot be stored. Therefore, the D
Audio data recorded on VD cannot be recorded at the maximum bit rate of DVD, 10.08 Mbps.
That is, the maximum bit rate of the audio data recordable in the DVD video is 6.75 Mbps.
And the maximum sampling frequency is 96 KHz.
The linear PCM multi-channel audio data of the DVD video is shown in Table 7 below.

[Table 7]

An embodiment of the present invention provides a DVD audio that records only pure audio data without recording video data. Therefore, DVD audio is
Unlike video, the maximum bit rate of DVD is 10.08.
Multi-channel audio data can be recorded within a range not exceeding Mbps. Accordingly, the DVD audio can use a maximum of 192 KHz sampling frequency, and the number of audio channels can be expanded to 13 channels. The basic file structure recorded in the information area of the DVD audio also has the structure as shown in FIG. In the file structure shown in FIG.
The file linked to the UDIO_TS directory is D
7 is a file structure for a VD audio and playback device. Therefore, as described above, both the AUDIO_TS and the VIDEO_TS exist in the DVD audio, the VIDEO_TS records the position information of the title that can be reproduced in the DVD video and the position information of the VMG, and the AUDIO_TS reproduces the DVD audio in the AUDIO_TS. Possible location information and AMG location information are recorded. Therefore, the DVD playback device can check the state of the directory when inserting the DVD, and determine whether or not the inserted disc is DVD audio.

FIG. 13 shows the concept of a logical data structure of DVD-Audio linked to the DVD audio directory in FIG. The logical data structure of the DVD audio is a structure of volume space.
And the structure of Audio Manage
r: hereinafter referred to as “AMG”), structure of AudioTitle Set:
S ”), audio object set structure (Stru
culture of Audio Object Set: hereinafter referred to as “AOBS”). FIG. 13 shows a logical data structure of the DVD audio. Referring to FIG.
The volume space of the D disk is a volume and file structure, a single DVD audio zone (DVD-Audio zone).
e), DVD and other zones (DVD-others zone). The DVD audio zone to which the data structure of the DVD audio is allocated is one A
An MG and at least one to a maximum of 99 ATSs can be allocated. The AMG is located at the front of the DVD audio zone and is composed of two or three files. The ATS includes at least three files to a maximum of 12 files.

The structure of the AMG and the ATS has the same or similar structure as the VMG and VTS of the DVD video as shown in FIGS. However, the linear P
CM and pseudo-lossless compression encoded data PLPCD (Ps
The structure for eudo-Lossless Psychoacoustic coded data is linear PCM or lossless compression coded data (Lossles
s Coded data) or pseudo-lossless compression coded data. Therefore, the VMG and VTS
It should have a slightly different structure. That is, the DV
The contents to be transformed in D audio are VMG and V
The part for specifying the sampling frequency and the number of channels in the part for specifying the audio attribute in the TS should be extended and used as AMG and ATS.

Therefore, the DVD audio has a volume structure as shown in FIG. Referring to FIG. 13, the volume space of a DVD disc has a volume and file structure, a single DVD audio zone (DVD-Video).
zone) and a DVD-others zone. The DVD audio zone to which the DVD audio data structure is assigned is 1
AMG and at least 1 to a maximum of 99 ATs
S can be assigned. The AMG is a DVD
It is located at the front of the audio zone and consists of two or three files. The ATS includes at least three files and up to twelve files.

FIG. 14 shows AMG (Audio Manager) and AT
S (AudioTitle Set) shows the structure of all AOB (Audio
(Object) is recorded in a continuous block. The AOB is composed of audio data.
Referring to FIG. 14, the AMG is an AMG of control data.
I (Audio Manager Information) file, AOB menu (AMGM_AOBS) file, and AMGI
Consists of backup files. The n ATSs are the ATSI of the control data, the AOB menu (ATSM_AOBS), and the AOB title (ATS).
TT_VOBS) and an ASTI back file. Also, the ATSTT_AOBS includes a number of Cs.
_IDN. Here, C_IDN # is AO
B indicates the cell ID number, and AOB_IDN # is AOB
Indicates the AOB ID number.

FIG. 15 is a diagram showing the structure of the AMGI shown in FIG. 14, and includes information on an associated AUDIO_TS directory. As shown in FIG.
GI is AMGI_MAT (Audio Manager Information M
anagement Table) and TT_SRPT (Title
Search Pointer Table), AMGM_PGCI_UT (A
udio Manager Menu PGCI Unit Table), PTL_MAI
T (Parental Management Information Table), ATS
_ATRT (Audio Title Set Attribute Table), TX
TDT_MG (Text Data Manager), AMGM_C_A
DT (Audio Manager Menu Cell Address Table), AM
GM_AOBU_ADMAP (Audio ManagerMenu Audio
Object Unit Address Map) will follow.

FIG. 16 shows the structure of TT_SRPT of the AMGI. The TT_SRPT is AUDIO_
The search information of the video title under the TS directory is provided. The TT_SRPT is TT_SRPT information.
SRTTI (Title Search Pointer Table Information)
, And n title search pointers TT_SR
P # (Title Search Pointer for Title #) successively follows in numerical order. Here, the TT_SRP # is 0-9.
It has a size of nine.

FIG. 17 shows audio title set information ATSI (Aud) located before each ATS shown in FIG.
io Title Set Information). Referring to FIG. 17, the ATSI includes one or more audio titles and information of an audio title set menu (ATSM). The ATSI includes management information of each title. Here, the title management information includes information for searching for PTT (Part_of_Title), information for reproducing AOB, and AT
SM information and information on AOB attributes are provided. As shown in FIG. 17, the ATSI is A
TSI_MAT (Audio Title SetInformation Manageme
ATS_PTT_SRPT (Au
dio Title Set Part_of_Title Search Pointer Tabl
e), ATS_PGCIT (Audio Title Set Program Cha)
in Information Table), ATSM_PGCI_UT (Au
dio Title Set Menu PGCI Unit Table), ATS_TM
APT (Audio Title Set Time Map Table), ATSM_
C_ADT (Audio Title Set Cell Address Table), A
TSM_AOBU_ADMAP (Audio Title Set Menu
Audio Object Unit Address Map), ATS_C_ADT
(Audio Title Set Menu Cell Address Table), ATS
_AOBU_ADMAP (Audio Title Set Audio Objec
t Unit Address Map) will follow.

FIG. 18 shows a DVD audio audio title set information management table ATSI_MAT (Audio
Title Set Information Management Table) is shown. The ATSI_MAT indicates each information of the ATSI and the start address of the attribute of the AOBS in the ATS. ATSI_MA of the DVD audio
T (Audio Title Set Information anagement Table) is ATSI_MAT having a structure as shown in FIG.
ATSM_AST_ATR of ~ 267 and RBP516
APS_AST_ATRT of ~ 579 and RBP792
~ 1298 ATS_MU_AST_ATR_EXT.

Here, the audio coding mode of the ATSM_AST_ATR and ATS_AST_ATRT stores coding information of audio data recorded on DVD audio. In the embodiment of the present invention, the linear PCM method, the lossless compression coding method, and the pseudo-lossless compression coding method (Pseudo-Lossless Psychoacou
stic coding: Hereinafter, the lossless compression coding method and the pseudo lossless compression coding method are referred to as compression coding methods). In the embodiment of the present invention, it is assumed that the compression coding mode uses a DTS coding scheme. This is because the DTS can support both a lossless compression coding scheme and a pseudo lossless compression coding scheme. At this time,
The DTS encoding mode can be used as an option. If b63 to b61 are “110b”, the DTS audio encoding mode is set.

First, considering the change of the ATSM_AST_ATR, the data patterns and definitions of b55 to b48 are changed as shown in FIG. That is, ATSM_A
Of b55 to b48 of ST_ATR, b53 to b52
Change the sampling frequency data of
Replace the ed bit with the audio channel bit (Numver of Audio
Channels). As shown in FIG.
Looking at the definition changed in M_AST_ATR,
The audio sampling frequency fs is changed as shown in Table 8 below.

[Table 8] The number of audio channels is changed as shown in Table 9 below.

[Table 9]

Second, looking at the change of ATS_AST_ATRT, the RBP is determined by the ATSI_MAT of FIG.
ATS_AST_ATRT (Audio Str)
The eamattribute table of ATS) is 8 as shown in FIG.
ATS_AST_ATR # of audio streams
0 to # 7 are stored, each ATS_AST_ATR is composed of 8 bytes having a structure as shown in FIG. 20B, and the value of each field is information inside the audio stream of ATSM_AOBS. The data patterns and definitions of b55 to b48 are changed as shown in FIG. That is, as shown in FIG. 8B, ATS_AST_A
In b55 to b48 of the TRT, the reserved bits of b51 are absorbed into audio channel bits (Number of Audio Channels). Looking at the definition changed in FIG. 20B, the audio sampling frequency fs is changed as shown in Table 8 and the number of audio channels is changed in Table 9 above.
Change as follows.

Third, in ATS_MU_AST_ATRT, information as shown in FIGS. 22 and 23 is added to FIGS. 10 and 11. The ATS_MU_AST_ATR
(1) and ATS_MU_AST_ATR (2) do not provide information for linear PCM audio of eight or more channels to provide audio data information for up to eight channels and information on mixing coefficients of channels. Therefore, in the embodiment of the present invention, since up to 13 channels are possible, information from the ninth channel to the thirteenth channel is recorded in the reserved area after ATS_MU_AST_ATR (1) and ATS_MU_AST_ATR (2). Therefore, ATS_M as shown in FIG.
Construct U_AST_ATRT. Referring to FIG. 21, thirteen ATS_MU_AST_ATRs # 1 to # 39 having a size of 39 bytes for storing information on thirteen audio channels and mixing coefficient information.
12 is provided.

Then, the respective ATS_MU_A
ST_ATR is composed of audio channel information as shown in FIG. 22 and mixing coefficient information as shown in FIG. Here, FIG. 22 shows ATS_MU_AST_ATR_EXT of the extended five audio channel information.
(1) is shown, ATS_MU_AST_ATR for recording audio data information of 8 channels
The configuration of (1) is omitted. FIG. 23 shows ATS_MU_AST_ATR for recording the mixing coefficient information of the extended five audio channels.
_EXT is shown, and mixing coefficients for eight audio data channels are recorded. The configuration of ATS_MU_AST_ATR (2) is omitted.

ATSI_MAT having the above structure
Is information of audio data recorded on DVD audio, and is formed at the beginning of each audio title. After the ATSI_MAT, the AOBS of the actual audio data is continuously connected. Also, VTSI_MAT as shown in FIG. 7 is information of video data, sub-picture data and audio data recorded on DVD video, and is formed at the beginning of each video title. After the VTSI_MAT, VOBS of actual data is continuously connected. The AOB
S has a structure as shown in FIG. 24 and includes a number of audio packs to record audio data. The VOBS has a structure similar to that of FIG. 24, and includes a plurality of video packs, sub-picture packs, and audio packs to store video data, sub-picture data, and audio data. The AOBS audio pack and the VOBS audio pack have the same structure.

Here, first, the structure of the VOBS is examined.
Next, let's examine the structure of AOBS. Looking at the structure of the VOBS, one VOBS includes a plurality of video objects VOB_IDN1 to VOB_IDNi, one video object VOB includes a plurality of cells C_IDN1 to C_IDNj, and one cell includes a plurality of cells. Video Object Unit VOBU (Vid
EOBU, and one VOBU is composed of a video pack. Video data recorded on a DVD video is composed of packs, and FIG.
The VD shows the configuration of a pack without padding packets. Referring to FIG. 25, one pack has a size of 2048 bytes, a pack header of 14 bytes and a packet of 2034 bytes (packets for video, audio, sub-picture, DSI or PC).
It consists of I). The 14-byte packet header has a 4-byte pack start code (pack start cod
e), 6-byte SCR and 3-byte program-MU
It consists of an X-rate (program-mux-rate) and a 1-byte stuffing length (stuffing_length).

FIGS. 26 to 29 show the structure of an audio pack used in DVD video. FIG. 26 shows the structure of a linear PCM audio pack. Referring to FIG. 26, a 14-bit pack header and
It consists of a 4-byte linear audio packet. Here, looking at the configuration of the audio packet,
1-byte packet header, 1-byte substream id (sub_stream_id), and 3-byte audio frame information
And 3 bytes of audio frame information (audio data In
formation) and linear PCM audio data having a size of 1 byte or more and 2013 bytes or less.

FIG. 27 shows the structure of the Dolby AC-3 audio pack. Referring to FIG. 27,
It consists of a 14-bit pack header and a 2034-byte Dolby AC-3 audio packet. here,
Considering the configuration of the audio packet, a 1-byte packet header (packet header), a 1-byte sub-stream id (sub-stream-id), 3-byte audio frame information (audio frame information), 1
AC- having a size of at least byte and not more than 2016 bytes
3 audio data. FIG. 28 shows M without an extension bitstream.
FIG. 29 shows the structure of an PEG-1 audio or MPEG-2 audio pack, and FIG. 29 shows the structure of an MPEG-2 audio pack having an extension stream.

Each of the audio packs having the structure shown in FIGS. 26 to 29 has the same structure as shown in Table 10 below, and separately has a private data area corresponding to each format. .

[Table 10] In Table 10, Note 1 and Note 2 are as follows. Note 1: "PTS [32 ... 0]" is included in each audio packet including the first sample of the audio frame. Note 2: This value is included only in the first audio packet of each VOB. It is not included in subsequent audio packets.

The data recorded in the individual data area other than the common data as shown in Table 10 in the audio packet of the linear PCM data having the structure as shown in FIG. 26 is as shown in Table 11 below.

[Table 11] In Table 11, Note 1 to Note 10 are as follows. Note 1: *** indicates the decoding audio data stream number. Note 2: "number_of_frame_headers" indicates the number of audio frames in which the first byte is included in the data packet. Note 3: An access unit is an audio frame. First access unit (first_acc
ess_unit) is the first audio frame in which the first byte is included in the audio packet.

Note 4: “audio_emphasis_flag” indicates the state of emphasis. Audio sampling frequency
When (Audio_sampling_frequency) is 96 KHz, “emphasis off” is recorded in this area. Emphasis is applied from the first access unit sample. ob: emphasis off 1b: emphasis on Note 5: “audio mute flag” indicates a mute state in which all data in an audio frame is zero. Mut is applied from the first sample of the first access unit. ob: mute off 1b: mute on Note 6: “audio frame number” is a number in the audio frame group (GOF) of the first access unit of the audio packet. This number is from "0" to "19".

Note 7: “quantization_word_length”
Refers to the number of bits used to quantize the audio samples. 00b: 16 bits 01b: 20 bits 10b: 24 bits 11b: reserved Note 8: “audio_sampling_frequency” indicates a sampling frequency used for sampling an audio sample. 00b: 48 KHz 01b: 96 KHz others: reserved

Note 9: “number_of_channels” indicates the number of audio channels. 000b: 1ch (mono) 001b: 2ch (stero) 010b: 3ch (multichannel) 011b: 4ch (multichannel) 100b: 5ch (multichannel) 101b: 6ch (multichannel) 110b: 7ch (multichannel) 111b: 8ch (multichannel)

Note 10: "dynamic range control" refers to a dynamic range control word for compressing the dynamic range from the first access unit. At this time, the stream id of the audio packet as shown in FIGS. 26 to 29 is determined as follows. First, the stream id of the linear PCM audio packet is 1011
1101b (private_stream_1), and the substream id becomes 10100 *** b. Second, AC-3
The stream id of the audio packet is 1011 11
01b (private_stream_l) and the substream id
Becomes 10000 *** b. Third, the stream id of the MPEG audio packet is 1100 0 *** b
Or 11010 ***** b and the substream i
There is no d. The stream id or substream i
In d, "***" indicates a decoded audio stream number having a value between 0 and 7, and the decoded audio stream numbers are not assigned to the same number regardless of the audio compression mode.

FIG. 30 is a diagram for explaining the structure of an audio pack and an audio stream. The DVD
Audio data used for audio is linear PCM
Data, Dolby AC-3 data, MPEG audio data, etc. Such an audio stream is divided into a number of audio packs as described above. The audio pack is adjusted in units of 2048 bytes as described above.

At this time, the encoding format of the linear PCM audio data is as shown in Table 12 below.

[Table 12] In Table 12, the linear PCM audio stream data is composed of adjacent GOFs (Group of audio frames).
Each GOF, except for the last GOF, consists of 20 audio frames. The last GOF is configured to be equal to or smaller than 20 audio frames.

FIG. 31 is a diagram showing the structure of an audio frame in a DVD video. As shown in FIG. 31, one audio frame has sample data for a set time of 1/600 second. When the sampling frequency fs = 48 KHz, one audio frame includes 80 audio sample data, and when the sampling frequency fs = 96 KHz, one audio frame includes 160 audio sample data.
One GOF corresponds to 1/30 second.

FIGS. 32 to 34 show a linear data array for linear PCM. The sample data is composed of each channel data sampled at the same time. Therefore, the size of the sample data depends on the audio stream attribute (attri
bute), and each sample data is continuously arranged. FIGS. 32 to 34 show the forms of two sample data in each mode. Here, FIG.
Shows a sample data array in the 16-bit mode, FIG. 33 shows a sample data array in the 20-bit mode, and FIG. 34 shows a sample data array in the 24-bit mode.

The packet data structure of the linear PCM audio is shown in Table 13 below.

[Table 13] At this time, if the number of samples is smaller than the value shown in Table 13, the length of the padding packet increases to adjust the pack size. Sample is at the packet boundary
(boundary). That is, the sample data of all audio packets for the linear PCM audio always starts with the first byte of _S2n as shown in Table 13. Considering the channel assignment of the linear PCM, ACH0 and IACH1 in stereo mode are considered.
The channels correspond to the L channel and the R channel, respectively. The multi-channel mode is encoded so as to be compatible with the stereo mode.

Second, looking at the structure of the AOBS of the DVD audio, the structure of the AOBS is configured as shown in FIG. Since the DVD audio records only audio data, there is no video pack V_PCK and sub-picture pack SP_PCK, or even a very small amount. The AOBS is composed of a set of audio packs like the VOBS, and the general structure of the audio pack is shown in FIG.
And the structure of the audio pack is the same as that shown in FIGS.
It is the same as FIG. It is assumed that DVD audio according to an embodiment of the present invention does not use MPEG and AC-3. DVD audio according to an embodiment of the present invention is a linear PC
It is assumed that audio data of the M system and the compression encoding system are recorded.

First, let us consider an audio data packet of the linear PCM system. Tables 10 and 11 are DVDs.
Shows a linear PCM audio packet of the video. However, the DVD-Audio linear PCM packet should modify the DVD-Video linear PCM packet as described above. Looking at the linear PCM method of DVD audio, the sampling frequency is 48 KHz, 9
6KHz, 192KHz, 44.1KHz, 88.2K
Hz, 176.4 KHz, and the quantization bit number is 16
Bits, 20 bits and 24 bits, and the number of recording channels is the maximum allowed by the bit rate in one channel. The number of recording channels is determined by the following equation (1). N = Mbr / (Fs × Qb) (1) Fs: sampling frequency (Hz) → 48 KHz, 96
KHz, 192KHz, 44.1KHz, 88.2KH
z, 176.4 KHz Qb: Quantization bit number (bits) ⇒ 16 bits, 20 bits, 24 bits Mbr: Maximum data transmission rate of DVD disc (Mbp
s) ⇒ 10.08 Mbps N: Maximum number of recordable channels determined by the data transmission rate, sampling frequency, and quantization bit number of DVD disc

The number of channels determined by Equation 1 is as shown in Table 14 below.

[Table 14] The DVD audio linear PCM audio pack structure is configured as shown in FIG. The structure of the linear PCM audio pack as shown in FIG. 35 has the same form as the structure of the linear PCM audio pack of DVD video as shown in FIG. That is, in the DVD PC linear PCM method, one audio pack is composed of a pack header of 14 bytes and a linear PCM packet of a maximum of 2021 bytes. In FIG. 35, the pack header (pack
header) conforms to the rules of the MPEG2 system layer.

The structure of the linear PCM audio packet is also based on the definition of the MPEG2 system layer.
The linear PCM audio packet has a structure as shown in Tables 15 and 16 below. Here, Table 15 has the same form as Table 10 of the DVD PC linear PCM audio packet structure. It has a different structure from Table 11 to be displayed.

[Table 15]

[Table 16] In Table 16, Note 1 to Note 10 are as follows. Note 1: *** indicates the decoding audio data stream number. Note 2: “number_of_frame_headers” indicates the number of audio frames including the first byte in the corresponding data packet.

Note 3: Access unit
Is an audio frame. The first access unit (first_access_unit) refers to the first audio frame in which the first byte is included in the corresponding audio packet. Note 4: "audio_emphasis_flag" indicates the state of emphasis. Audio sampling frequency (audio_sampl
If "ing_frequency" is 96 KHz or 192 KHz, "emphasis off" should be displayed. Emphasis is applied from the first access unit sample. ob: emphasis off 1b: emphasis on Note 5: "audio mute flag" indicates a mute state in which all data in an audio frame is zero. Mut is applied from the first sample of the first access unit. ob: Mute off 1b: Mute on

Note 6: “audio frame number” is a number of the first access unit of the audio packet in an audio frame group (GOF). This number is from "0" to "19". Note 7: “quantization_word_length” refers to the number of bits used for quantization of an audio sample. 00b: 16 bits 01b: 20 bits 10b: 24 bits 11b: reserved Note 8: “audio_sampling_frequency” indicates a sampling frequency used for sampling an audio sample. 000b: 48 kHz 001b: 96 kHz 010b: 192 kHz 011b: reserved 100b: 44.1 kHz 101b: 88.2 kHz 110b: 176.4 kHz 111b: reserved

Note 9: “number_of_channels” indicates the number of audio channels. 0000b: 1ch (mono) 0001b: 2ch (stereo) 0010b: 3ch (multichannel) 0011b: 4ch (multichannel) 0100b: 5ch (multichannel) 0101b: 6ch (multichannel) 0110b: 7ch (multichannel) 0111b: 8ch (multichannel) 1000b: 9ch (multichannel) 1001b: 10ch (multichannel) 1010b: 11ch (multichannel) 1011b: 12ch (multichannel) 1100b: 13ch (multichannel) Note 10: “dynamic range control” is a dynamic for compressing a dynamic range from the first access unit. Refers to the range control word. DVD-Audio linear PC having such a structure
The structure of the M audio packet and the length of the corresponding frame are 4
An example in the case of assuming 8 kHz / 96 kHz / 192 kHz is shown in Table 17 below.

[0061]

[Table 17] At this time, if the number of samples is smaller than the number of samples in Table 17, the length of the padding packet is extended to match the length of the pack. Then, the samples are matched to a packet boundary. That is, the start of all audio packets starts from the first byte of S2n. This means that the number of audio samples in one packet is always even. As described above, in the DVD audio format, linear PCM data is composed of frames and GOF (Group of Audio Frames) which is a set of the frames.
Is processed in units of As described above, the DVD audio can use a sampling frequency of 192 KHz. In such a case, a basic rule of linear PCM encoding as shown in Table 18 below can be set.

[Table 18]

When the sampling frequency is 192 KH
In the case of z, one audio frame has 320 audio sample data, and one GOF corresponds to 1/30 second like a DVD video. 96K
A multi-channel can be realized using a sampling frequency of 1 Hz, and high-quality audio data can be stored.

Second, let us consider a case where a compression encoding method is used for the DVD audio. When recording the linear PCM audio data, as described above,
When an 8 KHz sampling frequency and a 16-bit quantizer are used, 13 channels can be recorded, and up to 10 channels of audio data currently required for multi-channel music can be recorded. However, when using a 192 KHz sampling frequency and a 24-bit quantizer, audio data of up to two channels is recorded, and it is not possible to satisfy the demand for multi-channel audio. Therefore, it is difficult to implement a multi-channel audio function when sampling with a high sampling frequency and using many bits.
To implement this, compression coding (Lossless coding or Pseudo-Lossless Psychoacustic coding) may be used. The compression rate of lossless coding is mostly about 2: 1, and the compression rate of pseudo lossless coding is about 4: 1.

The compression encoding (Pseudo_Lossless Psychoacoustic) used in the DVD audio according to the embodiment of the present invention.
Coding) is a DTS (Diode) having a normal compression ratio of about 4: 1.
gital Theater System) encoding method. The DTS can also perform lossless compression encoding. The DTS coding method can include a sufficient number of channels without another deterioration in sound quality. For example, DTS
In the case of, unlike the other compression encoding algorithms that are currently announced, encoding is possible even at a high SPEC of 192 KHz and 24 bits, and in the direction of minimizing the deterioration of sound quality rather than reducing the bit rate. This is a developed algorithm. The sampling frequency is 48 KHz, 4
4.1KHz, 96KHz, 88.2KHz, 192K
Hz, 176.4 KHz, and the quantization bit number is 16
Bits, 20 bits, and 24 bits, and the number of recording channels is the maximum allowed by the one-channel decoding method and the bit rate. The number of recording channels is determined by the following (2)
This is done by formula. N = (Mbr × Ccr) / (Fs × Qb) (2) Fs: sampling frequency (Hz) → 48 KHz, 4
4.1KHz, 96KHz, 88.2KHz, 192K
Hz, 176.4 KHz Qb: Number of quantization bits (bits) ⇒ 16 bits, 20 bits, 24 bits Mbr: Maximum data transmission rate of DVD disc (Mbp
s) ⇒ 10.08 Mbps Ccr: Pseudo-Lossless Psychoacoustic Coding compression ratio N: Maximum number of recordable channels determined by the data transmission rate of DVD disc, sampling frequency, and number of quantization bits.

Here, the compression coding technique uses a compression ratio of 4:
Suppose that a DTS encoding method of 1 is used, where
The number of channels determined by Equation 2 is shown in Table 1 below.
9 Therefore, according to the above equation (2),
Eight or more channels can be supported for each sampling frequency.

[Table 19] As described above, the DVD audio structure according to the embodiment of the present invention is based on the structure of the MPEG2 system layer.
6 is configured. Therefore, the compressed and encoded audio pack has a pack header of 14 bytes and a maximum of 2 bytes.
It is composed of a 021-byte compression-encoded audio packet. In FIG. 36, the pack header is MPEG2
Follow the rules of the system layer.

The structure of the compression-encoded audio packet is also based on the MPEG2 system layer. The compression-encoded audio packet has a structure as shown in Tables 20 and 21 below. Here, Table 20 has the same form as Table 10 of the linear PCM audio packet structure of the DVD video.

[Table 20]

[Table 21] Note 1 to Note 3 in Table 21 are as follows. Note 1: “sub_stream_id” differs depending on the compression coding technique, and if the compression coding technique is DTS, “1000”
1 *** b ". *** in the substream id
Is a decoded audio stream number. Note 2: “number_of_frame_headers” indicates the number of audio frames in which the first byte is included in the data packet.

Note 3: Access unit
Is an audio frame, and first_access_unit is the first audio frame in which the first byte is included in the corresponding audio packet. As described above, the DVD audio disk of the compression encoding technique has the following specifications. First, the number of channels that can be compression-coded is eight or more, and second, the sampling frequency is 48 KHz, 44.1 KHz, 96 KHz, 8
8.2 KHz, 192 KHz, 176.4 KHz can be used, and third, the number of quantization bits is 16 bits,
Fourth, the compression ratio can be from 1: 1 to more than 5: 1, fifth, down mixing, dynamic range control (dyna
There are functions such as mic range control) and time stamp, and the sixth is to actually receive the recognition of excellent sound quality.

As described above, in the embodiment of the present invention, it is assumed that the DVD audio compression encoding method uses DTS having a normal compression ratio of about 4: 1. The DTS
The compression algorithm has a low compression ratio and has a high sound quality so that it can be used for music, and can be adopted as an option in DVD video. The DVD video has a DTS pack structure, a packet structure, and a resticted item for DTS audio. Considering the above restriction items, in the case of DTS, the bit rate after compression is up to 1.5 Mps, and the sampling frequency of compressible data can only be used at 48 KHz. In the DVD audio according to an embodiment of the present invention, when the DTS algorithm is used, the sampling frequency is 192K.
Hz, the number of quantization bits is 24 bits, and the multi-channel data is compressed at a level of about 4: 1, and expanded so that it can be reproduced well. That is, the compression encoding method used for DVD audio according to the embodiment of the present invention is a sampling frequency of 48 KHz / 44.1 KHz / 96 KHz / 88.2 K.
Hz / 192 KHz / 176.4 KHz, and the number of quantization bits is 16 bits / 20 bits / 2.
It is possible to compress 4-bit multi-channel linear PCM data to about 4: 1 without deterioration of sound quality.

The DVD audio may include a VIDEO_TS and a VMG corresponding to an information area of the DVD video for compatibility with a device for reproducing the DVD video. However, the DVD video has a transmission rate of one audio stream of 6.1 as described above.
It is regulated so that it cannot exceed 44 Mbps. That is, the transmission rate of DVD video is limited as shown in Table 22 below.
(restrictions on transfer rate).

[Table 22] Therefore, the device for reproducing the DVD video does not reproduce all the data of the DVD audio but the DVD video.
Only data that meets the video rules can be played.
As described above, when the linear PCM data is reproduced by the DVD video reproducing apparatus, as shown in Table 7, the DTS stream specified by the DVD video is also used when reproducing the compressed and encoded DTS data. Only can be played. For example, assume that the titles stored on the disc are as shown in Table 23 below.

[Table 23]

Then, the DVD audio VI
In the DEO_TS and VMG, information and position information on the properties of titles 1 to 3 are recorded.
No information for title 5 is recorded. However, DV
AUDIO_TS and AMG of D audio can record all information for titles 1 to 5. This is because the titles 1 to 3 are also included in the DVD video regulations, but the titles 4 to 5 are not included in the DVD video regulations but are included only in the DVD audio regulations. Therefore, the titles 4 and 5 can be used only in a device for reproducing DVD audio. In such a case, if there is room in the data area, the title 4 and title 5
The title 4 ′ and the title 5 ′ are separately recorded by lowering the sampling frequency, the number of quantization bits and the number of channels so that the apparatus can reproduce the D-video, and the VIDEO can be reproduced.
Title 4 'and title 5' for O_TS and VMG
Can be recorded and played back.

When the DTS of the compression coding system is out of the DVD video standard (for example, the transmission rate, the number of channels, the sampling frequency of original data, the number of quantization bits, etc.), the information is recorded only in AUDIO_TS and AMG. And
No information is recorded in VIDEO_TS or VMG.
However, only the DTS stream within the DVD video standard is VI
It can be recorded in DEO_TS and VMG. Said D
In order to reproduce a DTS stream that does not conform to the VD video specification on a DVD video playback device, the corresponding audio stream is re-encoded according to the transmission rate, the number of channels, the sampling frequency, and the number of quantization bits conforming to the specification of the DVD video, and separately. After storing, the information of this title is
It should be recorded in EO_TS and VMG.

AMG and ATS of the DVD audio
The I_MAT has a structure such as VMG and VTSI_MAT of the DVD video as described above, and the DVD audio exceeds the DVD video standard by 192KH.
In order to process z and audio data of 8 or more channels, a disc is created in the following manner when used slightly modified as described above. First, all titles on the disc are DVD
If the standard is not exceeded, only either VMG or AMG is placed, and this one file is all referred to as VMG or AMG in VIDEO_TS and AUDIO_TS. In such a case, since the structure is the same, the DVD audio reproducing apparatus reproduces this file assuming it as AMG, and the DVD audio reproducing apparatus reproduces it as VMG.

Second, if at least one of the titles to be put on the disc has an audio stream that exceeds the DVD video specification, a VMG or AMG is separately provided.
The VMG does not record information for titles that do not conform to the DVD video regulations. The AMG does not need to store information on a title whose sampling frequency, number of quantization bits, number of channels, and the like are changed so that the DVD-Video player can reproduce the title. However, DVD audio AMG and ATSI_MAT
If the VD video has a completely different structure from VMG or VTSI_MAT, both cases are provided with VMG or AMG separately, and the VTSI_MAT and ATSI_MAT are separately provided.
Separately. Of course, only the information of the audio title conforming to the DVD video specification is recorded in VMG or VTSI_MAT.

Next, let us consider the configuration of a device for reproducing DVD audio as described above. The DVD audio disc reproducing device can be configured independently, and the DVD video reproducing device can be provided with the DV according to the embodiment of the present invention.
A D audio playback device can be added for use. In the embodiment of the present invention, a DVD audio reproducing apparatus will be described first, and then a reproducing apparatus in which a DVD audio reproducing apparatus is added to a DVD video reproducing apparatus will be described.

First, FIG. 37 shows the configuration of a DVD audio playback device. The system control unit 111 is a DVD
Controls the overall operation of the audio disc player,
Performs user interface functions. The system control unit 111 includes a VIDEO_TS directory and an AUDIO_TS directory located in a disk information area of the disk.
The O_TS directory is read to determine whether valid data is available or not, and a DVD video or DVD audio is determined. At this time, if valid data exists in the AUDIO_TS directory, the system control unit 111 determines that the inserted disc is DVD audio, and controls a DVD audio reproducing operation. But,
If there is no valid data in the AUDIO_TS,
The system control unit 111 determines that the inserted disc is a DV
It determines that the video is a D-video, and suspends the reproduction operation.

The pickup unit (pick-up unit) 112 is D
It performs a function of reading data recorded on the VD audio disc. A servo controller 113 controls the driving of the pickup 112 under the control of the system controller 111 to perform various servo functions.
The data receiving unit 114 analyzes and corrects errors in the audio data output from the pickup unit 112. The data receiving unit 114 has an ECC (Error Correlation).
rection Circuit). Audio decoder
A decoder 115 transmits the audio information output from the data receiving unit 114 to the system control unit 111, and decodes and outputs the audio data received under the control of the system control unit 111. The audio decoder 115 has a configuration for decoding linear PCM audio data and a compression-encoded audio data, respectively, for decoding audio data according to an embodiment of the present invention, and the configuration is as shown in FIG.

Referring to FIG. 38, the input buffer (i
The nput data buffer 211 stores audio data output from the data receiving unit 114 as an input.
The stream selector (stream selector) 212 controls the input buffer 21 under the control of the system control unit 111.
1 to selectively output the audio data stream outputted from Linear PCM Decoding unit
The circuit 213 receives the linear PCM audio data output from the stream selector 212 as input, decodes it into original audio data, and outputs the original audio data. Encoded data decoder 214 (Pseudo-Lossless Psychoacoustic Decoder)
The coding circuit) receives the compression-encoded data output from the stream selector 212 as input, decodes the data into original audio data, and outputs the original audio data. Output buffer (o
utput data buffer) 215 is the decoding units 213 and 2
The audio data output from the storage device 14 is stored and then output. Digital audio formatter
io formatter) 216 is the decoding units 213 and 214
The audio data output from is converted into the format specified by the system control unit 111 and output. The timing control unit 210 generates a timing control signal for controlling the operation of each component of the audio decoder 115 under the control of the system control unit 111.

Digital processing section (High-bit High-samplin)
g Digital Filter) 116 is the audio decoder 1
The audio data output from the input unit 15 is input, and the audio data input by the control signal of the system control unit 111 is digitally filtered and output.
Audio output section (High Performance Digital to Analo
g Converters and Analog Audio Circuitry 117 performs a function of converting and processing audio data output from the digital processing unit 116 into analog signals, and outputting the analog signals.

Referring to FIGS. 37 and 38, the data receiving unit 114 transmits audio data reproduced from a DVD audio disk to the audio decoder 115 through the pickup unit 112. Then, the reproduced audio data is sequentially stored in the input buffer 211 of the audio decoder 115.
Then, the stream selector 212 selectively outputs the data stored in the input buffer 211 to the corresponding decoding unit 213 or 214 under the control of the system control unit 111. That is, when the system controller 111 requests linear PCM audio data decoding, the stream selector 212
Is transmitted to the linear PCM decoding unit 213. Also, the system control unit 111
The stream selector 212 transmits the audio data stored in the input buffer 211 to the coded data decoding unit 214 when the decoding of the data encoded by the compression is requested.

First, the decoding operation of the linear PCM audio data will be described.
Means multichannle down mixing
mixing), sampling frequency conversion (sampling frequency
conversion), requantization of the input signal (requantization of
perform the function of the input signal). For example, if the data output from the system selector 212 is 8-channel data, and the data is converted to 2-channel data and output is requested, the linear PCM decoding unit 213
Performs multi-channel downmixing to produce the desired number of channels of output. The second input data is 1
When sampling is performed at 92 KHz and the system control unit 111 requests the sampling data output of 96 KHz, the linear PCM decoding unit 213 performs sampling frequency conversion to convert and output audio data having the requested sampling frequency. I do. If the third input audio data is 24-bit quantized data, and the system control unit 111 requests the output of 16-bit quantized data, the linear PCM decoding unit 213 performs a requantization process. To generate output audio data of a desired number of bits.

Next, the decoding operation of the compressed and encoded audio data will be described. The encoded data decoding unit 214 uses the corresponding algorithm under the control of the system control unit 111 to perform compression encoding. The encoded audio data is decoded and output. At this time, the format of the audio data output from the encoded data decoding unit 214 is a format specified by the system control unit 111. According to the embodiment of the present invention, the encoded data decoding unit 21
4 can be a DTS decoding unit. The coded data decoding unit 214 performs not only the decoding of the designated algorithm but also the multi-channel downmixing, the sampling frequency conversion, and the requantization of the input signal as described above.

The decoded audio data output from the decoding units 213 and 214 is
5 and the digital audio formatter 216. Then, the output buffer 215 stores the input decoded audio data and outputs the decoded audio data to the outside in synchronization with the control signal output from the timing control unit 210. Then, the digital audio formatter 216 formats the decoded audio data in accordance with the transmission format between digital devices, and transmits the data to the outside in synchronization with a control signal output from the timing control unit 210. At this time, the externally transmitted audio data can be output to an audio / video device or a computer having the same transmission format.

As described above, the audio decoder 115
The decoded audio data output from the digital processing unit 116 is output after being subjected to digital filter processing by the digital processing unit 116, and the audio output unit 117 converts the audio data output from the digital processing unit 116 into an analog signal and outputs the analog signal. Here, the digital processing unit 1
Reference numeral 16 includes a digital filter, and performs a function of removing noise components other than the audio signal band. At this time,
In order to process the audio data sampled at 192 KHz and quantized to 24 bits, the digital processing unit 116 needs a filter coefficient having a higher resolution and the number of taps than a digital filter currently used in DVD or CD. I do. Of course, the 96K
Hz, 192KHz D / A converter is generalized,
The digital processing unit 116 can be included in the D / A converter. The audio output unit 117 includes a D / A converter, and converts the audio data from which noise has been removed by the digital processing unit 116 into an analog audio signal and outputs the analog audio signal.

Next, FIG. 39 shows the configuration of a reproducing apparatus capable of reproducing a DVD video disk and a DVD audio disk in parallel. The system control unit 311 is a DV
It controls the overall operation of a device for playing D video discs and DVD audio discs, and performs a user interface function. The system control unit 1
11 is a VIDE located in the disk information area of the disk.
The O_TS directory and the AUDIO_TS directory are read to determine whether valid data is available or not, and discriminate between DVD video and DVD audio. At this time, the AU
If valid data exists in the DIO_TS directory,
The system control unit 111 determines that the inserted disc is a DV
Judgment is made for D audio, and the playback operation of DVD audio is controlled. However, if there is no valid data in the AUDIO_TS, the system control unit 11
1 determines that the inserted disc is a DVD video, and controls the DVD video playback operation.

The pickup section 312 has a function of reading data recorded on a DVD disk. Servo control section
(servo controller) 313 is the system controller 311
Under the above control, the drive of the pickup unit 312 is controlled to perform various servo functions. The data receiving unit 314 has a function of correcting and analyzing an error of the audio data output from the pickup unit 312. The data receiving unit 314 includes an ECC (Error Correction Circuit).
Audio / video decoder 3
Reference numeral 15 transmits information output from the data receiving unit 314 to the system control unit 311 and decodes and outputs audio / video data received under the control of the system control unit 311.

The audio / video decoder 315 has a configuration for decoding video data and audio data, and the configuration is as shown in FIG. Referring to FIG. 40, an input data buffer 411 stores audio and video data output from the data receiving unit 314 as input. Stream parser
A (stream parser) 412 selectively outputs audio and video data streams output from the input buffer 411 under the control of the system control unit 311. The audio decoding unit 413 receives the audio data selectively output from the stream parser 412 as an input, and decodes and outputs the audio data in a format set by the control data output from the system control unit 311. The decoded audio output unit 414 has a function of outputting the decoded audio data output from the audio decoding unit 413. Video decoding unit 4
Reference numeral 15 receives video data selectively output from the stream parser 412, decodes the video data in a corresponding method according to control data output from the system control unit 311, and outputs the decoded video data. The decoded video output unit 416 has a function of outputting the decoded video data output from the video decoding unit 415. Timing control unit 4
10 generates a timing control signal for controlling the operation of each component of the audio / video decoder 315 under the control of the system control unit 311.

In FIG. 40, the audio decoding unit 413 must include a decoding device corresponding to each of the linear PCM system, the MPEG system, the AC-3 system, and the compression coding system. Here, the linear PCM method and the compression encoding method should further include a configuration for reproducing audio data recorded on the disk device according to the embodiment of the present invention. That is, a decoding unit capable of reproducing audio data according to a sampling frequency, a quantization bit, and the number of audio channels according to the embodiment of the present invention is provided, and a stream selector for distributing audio data corresponding to each of the decoding units is provided. Prepare.

Digital processing unit (High-bit High-samplin)
g Digital Filter) 316 receives the audio data output from the audio / video decoder 315 as input, digitally filters the input audio data according to the control signal of the system control unit 311 and outputs it. Audio output section (High Performance Digital
to Analog Converters and Analog Audio Circuitry) 3
Reference numeral 17 performs a function of converting and processing audio data output from the digital processing unit 316 into an analog signal, and outputting the analog signal. Video output section (NTSC Encoder Video Digi
tal to AnalogConverter's Analog Video Circuitry) 3
Reference numeral 18 converts the video data output from the audio / video decoder 315 into an analog video signal after NTSC encoding, and outputs the analog video signal.

Referring to FIGS. 39 and 40, the reproduction data of the disc output from the pickup unit 312 is transmitted from the data reception unit 314, and the data reception unit 314 corrects and analyzes the received data. To the audio / video decoder 315. The data output from the data receiving unit 314 is audio / data.
The data is applied to the input buffer 411 of the video decoder 315 and stored. Then, the system parser 412 selects a necessary stream according to the control data of the system controller 311, analyzes the input data, transmits video data to the video decoder 415, and converts the audio data to the audio decoder 413. To communicate.

The audio decoding unit 413 transforms the audio data output from the stream parser 412 in response to a request from the system control unit 311 and outputs it. The audio decoding unit 413 should include an audio decoding function for a DVD video disc and an audio decoding function for a DVD audio disc. The video decoding unit 415 decodes the input video data according to a request from the system control unit 311 and then deforms and outputs the decoded video data. The video data transformation of the video decoding unit 415 refers to video signal processing such as a sub-title process and a pan-scan.

The decoded audio data and video data output from the audio decoding unit 413 and the video decoding unit 415 are output to the decoded audio output unit 414 and the decoded video output unit 416, respectively. Then, the output units 414 and 416 store the input decoded data and output the decoded data in synchronization with the timing control signal output from the timing control unit 410. At this time, the decoding audio output unit 414 performs a function of transmitting digital audio data formatted according to a transmission format between digital devices to the outside in accordance with timing. The audio data output from the decoded audio output unit 414 is transmitted to another audio / video device or computer.

Here, the audio / video decoder 315 of the reproducing apparatus having the configuration shown in FIG. 39 complies with the DVD video standard when processing a video signal, and according to the embodiment of the present invention when processing an audio signal. All algorithms and audio decoding algorithms according to the DVD video standard are processed. Accordingly, since the audio decoding unit 413 includes the linear PCM and DTS algorithms among the audio standards for DVD video, it can be reproduced even when a DVD video disc is inserted, and according to the embodiment of the present invention. Playback must be possible even when a DVD audio disc is inserted.

At this time, the algorithm required for audio decoding of the DVD video is linear PCM decoding (1) +
The algorithm required for audio decoding of DVD audio according to the embodiment of the present invention is AC-3 decoding + MPEG decoding, and linear PCM decoding (2) + Pseudo-Lossless Psychoacoustic Decoding. . Therefore, a linear PC in a DVD video disc
The M algorithm is included in the linear PCM algorithm according to an embodiment of the present invention. Therefore, DVD video and DVD
The decoding algorithm used in the device for reproducing audio should include a function as shown in the following equation (7), which is performed in the audio decoding 413. Audio decoder = Linear PCM Decoder (2) + Pseudo-Lossless Psychoacoustic Decoder + AC-3 Decoder + MPEG Decoder ... (7)

The playback device for simultaneously playing back the DVD video and the DVD audio uses the VID of the inserted DVD.
Search for EO_TS and AUDIO_TS to set the audio decoding mode. Here, audio data recorded on the DVD video will be considered. First, DV
When the video data is excluded from the D audio and only the audio data is recorded, the results shown in Table 24 below are obtained.

[Table 24]

Second, in the case of using the compression coding method specified in DVD video, compression can be performed up to 448 Kbps. The compressible sampling frequency is 48
KHz, and the number of quantizing bits that can be compressed is 16 bits. Therefore, only a limited type of data can be handled, and the compression ratio is about 10: 1. When the compression algorithm is the Dolby AC-3 algorithm, the quantization method is 1
6-bit linear PCM with a sampling frequency of 48
KHz, the maximum number of channels that can be recorded is 5.1, and the possible bit rate is 192 Kbps to 448.
Kbps. The Dolby AC-3 algorithm is unsuitable for exclusive use in audio because the number of quantizing bits that can be encoded and the sampling frequency are limited, the compression ratio is high, and the sound quality is severely degraded. When the compression algorithm is the MPEG2 algorithm, the quantization method is 16-bit to 24-bit linear PCM, the sampling frequency is 48 KHz, the maximum number of recordable channels is 7.1, and the possible bit rate is 64K
bps to 912 Kbps. The MPEG2 algorithm has a high number of quantizing bits that can be encoded and a large number of channels that can be recorded. However, the sampling frequency is limited, and the compression ratio is high and there is a problem of deterioration.

However, in the case of DVD audio, assuming that the transmission rate is 10.08 Mbps and the reproduction time is 80 minutes, linear PCM audio can be implemented as shown in Table 25 below. Further, even when the sampling frequency is 44.1 KHz, 88.2 KHz, or 176.4 KHz, the value has a value similar to that of Table 25 below.

[Table 25] When DTS is used in the compression encoding method, the quantization method is a linear P-bit of 16 bits, 20 bits, and 24 bits.
Using CM, sampling frequency is 48KHz, 4
4.1KHz, 96KHz, 88.2KHz, 192K
Hz and 176.4 KHz, the maximum number of channels that can be recorded is 13, and the compression ratio is about 4: 1. The DTS compression encoding method has a large number of quantizing bits and a sampling frequency that can be encoded, has a low compression ratio, and can maintain high sound quality.

The reproducing apparatus as shown in FIGS. 37 and 39 reads the contents of the AUDIO_TS directory of the inserted disc, checks whether there is valid data, and checks whether the DVD is valid.
Determine the disc type. At this time, if valid data exists in the AUDIO_TS directory, the DVD audio reproducing apparatus shown in FIG. 37 detects that the inserted disc is DVD audio, and
If the audio playback function is performed and there is no valid data in the AUDIO-TS directory, it is detected that the inserted disc is a DVD video, and the playback operation is interrupted. An apparatus for reproducing DVD video and DVD audio as shown in FIG.
-If valid data exists in the TS directory, it is detected that the inserted disc is DVD audio, a DVD audio playback function is performed, and the AUDIO
If no valid data exists in the _TS directory,
It senses that the inserted disc is a DVD video and performs a DVD video playback function.

In the embodiment of the present invention, the reproducing apparatus is shown in FIG.
The description will be made on the assumption that the device is capable of reproducing DVD audio and DVD video having the above structure. First DV
When D is inserted, the system control unit 311 sends 511
In step 513, the AUDIO of the DVD directory having the structure shown in FIG.
Read the contents of the _TS directory. Thereafter, the system controller 311 determines in step 515 that the AUDIO_TS
It is checked whether or not valid data is recorded in the. Here, when the inserted DVD is a DVD video, an AUDIO_TS directory exists, but no data is actually recorded in the directory. That is,
The DVD video has an empty AUDIO_TS directory. However, if the inserted DVD is DVD audio, the audio data position information as shown in FIGS. 13 to 23 is recorded in the AUDIO_TS directory.

Accordingly, if valid data is recorded in the AUDIO_TS directory in step 515, the system controller 311 detects that the disc inserted in step 517 is DVD audio. Since then
The system control unit 311 determines in step 519 that the AUDI
The O_TS directory is read to determine the position of the AMG having the structure shown in FIGS. 13 and 14, and in step 512, the pickup unit 312 is controlled to move the pickup to the position where the corresponding AMG is recorded. AMG
Is read to confirm the position information of the entire audio data recorded on the DVD audio. FIG. 13 and FIG.
As shown in FIG. 4, information on the entire audio title recorded on the DVD audio is recorded in the AMG, and the character and position information of each title is also included.

Thereafter, the system control unit 311 returns to 523
It is checked whether there is a request to reproduce a specific audio title at a stage. The title playback request is issued by the user or D
Generated by instructions recorded in VD audio. If a title playback request is detected in step 523, the system control unit 311 checks the AMG in step 525, identifies the disc location where the title is located based on the location information, and determines in step 527 the disc location. By controlling the pickup unit 312, the pickup is set to A
After moving to the TSI_MAT position, the ATSI_MAT at the corresponding title position is read. Thereafter, in step 529, the system controller 311 analyzes the information of the ATSI_MAT having the structure shown in FIGS. The audio decoder 413 of the audio / video decoder 315 is set so that the audio data recorded on the DVD audio can be reproduced according to the reproduction algorithm confirmed in the step. At this time, information to be set in the audio decoding unit 413 includes an audio encoding mode, a sampling frequency, the number of quantization bits, and the number of channels.

Thereafter, in step 533, the system control unit 3
Reference numeral 11 reproduces the corresponding audio title decoded by the audio decoding unit 413. However, if there is no valid data in the AUDIO_TS directory in step 515, the system control unit 311 returns to 535.
The disc inserted at this stage is determined to be a DVD video,
At step 37, the position of the VMG is determined from the VIDEO_TS directory.
To the corresponding position, read the VMG information, and
Check the overall information of the D-video. Thereafter, when a title playback request is issued, the system control unit 311 performs step 514 to play back video, sub-picture, and audio data of the title based on the VTSI_MAT information of the title.

However, in the case of the apparatus for reproducing the DVD audio, when the inserted disc is the DVD audio, the steps 511 to 533 are performed in the same manner.
In the case of DVD video, this is detected at step 515 and the reproduction operation is interrupted. After setting the audio decoding unit 413 based on the ATSI_MAT information as described above,
In step 533, the system control unit 111 performs the process shown in FIG.
The audio pack stored in a) is analyzed to reproduce audio data.

First, the system control part 311
In step 613, it controls the audio decoding unit 413 to start decoding operation, and in step 613, controls the stream parser 412 to convert the received audio data into an audio signal having the corresponding audio algorithm. To the conversion unit 413. Then, the corresponding audio decoding unit 413 decodes and outputs the audio data received by the algorithm set by the system control unit 311 as described above. At this time, the system control unit 111 checks the operation state of the audio decoding unit 413 in step 615. At this time, when a decoding error occurs, the process proceeds to step 621 to control the operating audio decoding unit 413 to interrupt the decoding operation, and to control the stream parser 412 to interrupt the data transmission. 6 after driving the healing algorithm by
Return to step 11.

However, when the audio decoding unit 413 operating in the step 615 performs a normal operation, the audio data decoded in the step 617 is output to the outside through the decoded audio output unit 414, and then in the step 619. The operation state of the audio decoding unit 413 is checked. At this time, if an abnormal decoding state occurs, the process proceeds to step 612, and if a normal operation is performed, the process returns so that the next audio data can be decoded. When the decoding of the audio stream is completed by the audio decoding unit 413 as described above, the system control unit 111 controls the digital processing unit 316 and the audio output unit 317 to convert the decoded audio data into an analog audio signal. And output.

[0105]

As described above, the DVD according to the embodiment of the present invention has VIDEO_TS and AUDIO_T
S directories are provided, and DVD audio and DVD video can be determined based on the presence or absence of valid data in these directories. The DVD audio has a maximum sampling frequency of 192 KHz and 24
Bit quantized audio data can be recorded, and the number of audio channels can be greatly expanded. Therefore, when the audio data recorded on the DVD audio is fully reproduced, a good audio signal can be reproduced and multi-channel music can be supported. The number of recordable channels, which is limited by the data transmission speed of the disk used, the sampling frequency of the signal, and the number of quantization bits of the sample, is made from a high sampling frequency and many quantization bits using an encoding algorithm or the like. It can be recorded as an audio signal and can be heard from multiple channels.

The linear PCM data sampled at the 192 KHz sampling frequency is divided into 96 KHz linear PCM data and its upper data, and the 96 KHz data is recorded as it is. The upper 192 KHz data is subjected to a lossless encoding technique. In the case of recording on a DVD according to the present invention, the audio title is recorded in AUDIO_TS with a sampling frequency of 192 kHz and a linear PC.
The video title is recorded in the M-lossless encoding system, and the video title is recorded in the VIDEO_TS by a linear PCM system with a sampling frequency of 96 kHz. At this time, the DVD audio playback device reads the AUDIO_TS, decodes the data using a lossless decoding method, and then decodes the data at 96 kHz.
And the data is reproduced as 192 KHz data. In addition, the DVD video playback device is VIDEO_
The TS is read and 96 kHz data is reproduced. That is, one title is created and the AUDIO of the present invention is created.
_TS and VIDEO_TS, respectively, so that the DVD audio player can play data at 192 kHz and the DVD video player can play data at 96 kHz.
The data can be reproduced in Hz.

Further, 44.1 KH for a conventional CD
When music data sampled at z is provided to a DVD, a conventional DVD video format is used.
The 1 KHz music data must be provided after being converted to 48 KHz music data. However, in this conversion process, the sound quality is deteriorated. The DVD according to the invention supports an audio frequency sampled at 44.1 KHz in the DVD audio format. Thus, the audio data is recorded as it is without conversion of the sampling frequency and provided together with the video data, so that it is possible to provide better sound quality.

A general DVD video reproducing apparatus has an S which does not reach the SPEC of a DVD audio disc as described above.
Because of having PEC, 192KH according to own performance
A DVD audio playback device capable of playing back z, 24-bit data can be used in parallel with the DVD video playback device.

[Brief description of the drawings]

FIG. 1 is a view showing a directory structure of a DVD.

FIG. 2 is a diagram showing a logical data structure of a DVD.

FIG. 3 is a diagram showing a video management structure (VMG) and a video title set (VTS) structure of a DVD.

FIG. 4 is a diagram showing a structure of video management information (VMG) of a DVD.

FIG. 5 is a DVD title search pointer table (T
FIG. 3 is a diagram illustrating a structure of (T_SRPT).

FIG. 6 shows DVD video title set information (VTS
The figure which shows the structure of I).

FIG. 7 is a diagram showing a configuration of a video title set information management table (VTSI_MAT) on a DVD.

FIG. 8A is an audio stream attribute table (VT) of a video title set on a DVD.
FIG. 8B is a diagram showing the configuration of an audio stream attribute (VTS_AST_ATR) of a video title set.

FIG. 9 is a multi-channel audio stream attribute table (VT) of a video title set.
FIG. 3 is a diagram illustrating a configuration of S_MU_AST_ATRT).

FIG. 10 shows a multi-channel audio stream attribute (1) (V
FIG. 3 is a diagram illustrating a configuration of TS_MU_AST_ATRT (1)).

FIG. 11 shows a multi-channel audio stream attribute (2) (V
FIG. 3 is a diagram illustrating a configuration of TS_MU_AST_ATRT (2)).

FIG. 12 shows a multi-channel audio stream attribute (2) (V
FIG. 3 is a diagram illustrating a configuration of TS_MU_AST_ATRT (2)).

FIG. 13 is a view showing a logical data structure of DVD audio.

FIG. 14 is a diagram showing an audio management structure (AMG) and an audio title set (ATS) structure of DVD audio.

FIG. 15 is a diagram showing a structure of audio management information (AMG) of DVD audio.

FIG. 16 is a view showing the structure of a DVD audio title search pointer table (TT_SRPT).

FIG. 17 is a view showing the structure of audio title set information (ATSI) of DVD audio.

FIG. 18 is a diagram showing a configuration of an audio title set information management table (ATSI_MAT) in DVD audio.

FIG. 19 shows an audio stream attribute (AT) of a video title set menu in DVD audio.
FIG. 2 is a diagram showing an internal configuration of SM_AST_ATR).

20A is a diagram showing a configuration of an audio stream attribute (ATS_AST_ATRT) of an audio title set in DVD audio, and FIG. 20B is a diagram showing an internal configuration of an audio stream attribute (ATS_AST_ATR) of the audio title set. FIG.

FIG. 21 shows a multi-channel audio stream attribute table (AT) of an audio title set.
FIG. 3 is a diagram illustrating a configuration of S_MU_AST_ATRT).

FIG. 22 shows a multi-channel audio stream attribute (1) of an audio title set.
Extension of (ATS_MU_AST_ATRT (1)) (A
The figure which shows the structure of TS_MU_AST_ATR_EXT (1).

FIG. 23 shows a multi-channel audio stream attribute (2) of an audio title set.
Extension of (ATS_MU_AST_ATRT (2)) (A
The figure which shows the structure of TS_MU_AST_EXT (2).

FIG. 24 is a diagram showing a structure of an audio object set (AOBS) in DVD audio.

FIG. 25 is a diagram showing a DVD audio pack structure.

FIG. 26 is a diagram showing the structure of each audio pack of DVD audio.

FIG. 27 is a diagram showing the structure of each audio pack of DVD audio.

FIG. 28 is a diagram showing the structure of each audio pack of DVD audio.

FIG. 29 is a diagram showing the structure of each audio pack of DVD audio.

FIG. 30 is a view showing the configuration of a linear PCM audio packet in an audio pack having the structure shown in FIG. 26;

FIG. 31 is a view showing the structure of a linear PCM audio frame of DVD audio.

FIG. 32 is a diagram showing a sample data array of linear PCM.

FIG. 33 is a diagram showing a sample data array of linear PCM.

FIG. 34 is a diagram showing a sample data array of linear PCM.

FIG. 35 is a diagram showing a linear audio packet configuration of DVD audio.

FIG. 36 is a diagram showing the structure of a DTS audio packet of DVD audio.

FIG. 37 is a diagram showing a configuration of a DVD audio reproducing apparatus according to an embodiment of the present invention.

FIG. 38 is a diagram showing a configuration of an audio decoder in FIG. 37;

FIG. 39 is a diagram showing a configuration of an apparatus for playing DVD audio and DVD video according to an embodiment of the present invention.

FIG. 40 is a diagram showing a configuration of an audio / video decoder in FIG. 39;

FIG. 41 is a flowchart showing an operation of reproducing data recorded on DVD audio by the DVD audio reproducing device.

FIG. 42 is a flowchart illustrating an operation process of an audio decoder in a DVD audio playback device.

[Explanation of symbols]

 111 ... System control unit 112 ... Pickup unit 113 ... Servo control unit 114 ... Data receiving unit 115 ... Audio decoder 116 ... Digital control unit 117 ... Audio output unit

Continuation of front page (56) References JP-A-10-233058 (JP, A) JP-A-10-254645 (JP, A) JP-A-9-153770 (JP, A) JP-A-9-64750 (JP) JP-A-10-271457 (JP, A) JP 2000-504463 (JP, A) WO 98/18121 (WO, A1) WO 97/13365 (WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) G11B 20/12 G11B 20/10 301

Claims (14)

(57) [Claims] 1. A Oite the DVD audio disc, video _TS and audio _TS the disc information area
Directory located, the position information of the AMG is recorded in the audio _TS directory, de the AMG
The position information of each audio title of the disc is recorded,
The audio title is ATSI_MAT and multiple A
The audio stream attribute of the ATSI includes decoding algorithm information related to an audio encoding mode, first to third quantization bits, first to third sampling frequencies, and the number of audio channels. A DVD audio disc comprising: an audio pack in which the AOB stores audio data corresponding to a decoding algorithm recorded in the audio stream attribute. 2. The audio encoding mode is a linear PC.
In the case of M audio, the first to third quantization bits are 16 bits, 20 bits, and 24 bits, respectively, and the first to third sampling frequencies are 48 KH, respectively.
2. The DVD audio disk according to claim 1, wherein z, 96 KHz, and 192 KHz, the maximum number of audio channels is eight, and the number of channels is determined by the following equation (1). N = Mbr / (Fs × Qb) (1) Fs: Sampling frequency (Hz) Qb: Number of quantization bits (bits) Mbr: Maximum data transmission rate of DVD disc (Mbp)
s) N: The maximum number of recordable channels determined by the data rate, sampling frequency, and quantization bit number of the DVD disc. 3. The audio encoding mode is a linear PC.
For M audio, the first to third quantization bits are 16 bits, 20 bits and 24 bits, respectively, and the first to third sampling frequencies are 44.1, respectively.
KHz, 88.2 KHz and 176.4 KHz,
Wherein the maximum number of audio channels is 8 channels, the number of channels DVD audio data of claim 1, wherein a is determined by such (2) below
Disk . N = Mbr / (Fs × Qb) (2) Fs: Sampling frequency (Hz) Qb: Number of quantization bits (bits) Mbr: Maximum data transmission rate of DVD disk (Mbp)
s) N: The maximum number of recordable channels determined by the data rate, sampling frequency, and quantization bit number of the DVD disc. 4. When the audio encoding mode is a compression encoding method, the first to third audio data before compression are encoded.
The quantization bits are 16, 20, and 24 bits, and the first to third sampling frequencies are 48 KHz,
The DVD audio disc according to claim 1, wherein the number of audio channels is 96 KHz and 192 KHz, the maximum number of audio channels is 8, and the number of channels is determined by the following equation (3). N = (Mbr × Ccr) / (Fs × Qb) (3) Fs: Sampling frequency (Hz) Qb: Number of quantization bits (bits) Mbr: Maximum data transmission rate of DVD disk (Mbp)
s) Ccr: Compression ratio by DTS compression encoding method N: Maximum number of recordable channels determined by data transmission rate, sampling frequency and quantization bit number of DVD disc. 5. When the audio encoding mode is a pseudo lossless compression encoding method, the first to third quantization bits are 16 bits, 20 bits and 24 bits, respectively, and the first to third sampling bits are Frequency 4 each
2. The frequency band is 4.1 KHz, 88.2 KHz, and 176.4 KHz, the maximum number of audio channels is eight, and the number of channels is determined by the following equation (4). DVD audio disc . N = (Mbr × Ccr) / (Fs × Qb) (4) Fs: sampling frequency (Hz) Qb: number of quantization bits (bits) Mbr: maximum data transmission rate (Mbp) of DVD disk
s) Ccr: Compression ratio by DTS compression encoding method N: Maximum number of recordable channels determined by data transmission rate, sampling frequency and quantization bit number of DVD disc. 6. A DVD is stored in the video_TS directory.
The position information of the AMG consisting only of the position information of the audio title that can be reproduced by the video reproducing device is recorded.
The DVD according to any one of claims 1 to 5, wherein position information of each audio title of the disc is recorded on the MG, and the audio title is configured by continuously connecting ATSI_MAT and a number of AOBs. Audio disc . 7. Oite the DVD audio disc, video _TS and audio _TS the disc information area
Is located, AMG location information is recorded in the audio_TS directory, location information of each audio title of the disc is recorded in the AMG,
The audio title is ATSI_MAT and multiple A
The ATSI audio stream attribute includes decoding algorithm information related to an audio encoding mode, first to third quantization bits, first to sixth sampling frequencies, and the number of audio channels. A DVD audio disc comprising: an audio pack in which the AOB stores audio data corresponding to a decoding algorithm recorded in the audio stream attribute. 8. The audio encoding mode is a linear PC.
In the case of M audio, the first to third quantization bits are 16 bits, 20 bits, and 24 bits, respectively, and the first to sixth sampling frequencies are 48 KH, respectively.
z, 44.1 KHz, 96 KHz, 88.2 KHz, 1
The DVD audio disk according to claim 7, wherein the number of audio channels is 92 KHz and 176.4 KHz, the maximum number of audio channels is 8, and the number of channels is determined by the following equation (5). N = Mbr / (Fs × Qb) (5) Fs: Sampling frequency (Hz) Qb: Number of quantization bits (bits) Mbr: Maximum data transmission rate of DVD disk (Mbp)
s) N: The maximum number of recordable channels determined by the data rate, sampling frequency, and quantization bit number of the DVD disc. 9. When the audio encoding mode is a pseudo lossless compression encoding method, the first to third quantization bits of audio data before compression are 16 bits, 20 bits, and 24 bits, respectively. The first to sixth sampling frequencies are 48 KHz, 44.1 KHz and 96 KHz, respectively.
KHz, 88.2 KHz, 192 KHz, and 176.
The frequency of 4 KHz, the maximum number of audio channels is eight, and the number of channels is determined by the following equation (6).
VD audio disc . N = (Mbr × Ccr) / (Fs × Qb) (6) Fs: Sampling frequency (Hz) Qb: Number of quantization bits (bits) Mbr: Maximum data transmission rate of DVD disc (Mbp)
s) Ccr: Compression ratio by DTS compression encoding method N: Maximum number of recordable channels determined by data transmission rate, sampling frequency and quantization bit number of DVD disc. 10. A directory of video_TS and audio_TS is located in a disc information area of the disc,
The audio_TS directory records the position information of the AMG, the AMG records the position information of each audio title of the disc, and the audio title is continuously connected to the ATSI_MAT and a number of AOBs. In the attribute, decoding algorithm information relating to the audio encoding mode, the first to third quantization bits, the first to sixth sampling frequencies, and the number of audio channels is recorded,
An apparatus for playing a DVD audio disc including an audio pack in which audio data corresponding to a decoding algorithm recorded in the audio stream attribute is stored in the AOB, receiving audio data reproduced from the disc. A data receiving unit that checks information of the received audio_TS, detects that there is valid data as DVD audio, and analyzes the information of the received audio data to determine an audio encoding mode, a sampling frequency, A control unit for generating an audio control signal including the number of channels, quantization information, and the like, and interrupting the reproduction control if there is no valid data in the audio_TS; To be selected An audio decoder that decodes the received audio data and performs multi-channel mixing, sampling frequency conversion, and requantization processing on the decoded audio data based on the audio control signal; and the decoded audio data. And an audio output unit for converting an audio signal into an analog audio signal and outputting the analog audio signal. 11. A stream selector for selecting an audio stream received based on the audio encoding mode control signal and outputting the selected audio stream to a corresponding decoding unit, and an output from the stream selector. A linear PCM decoding unit that decodes a linear PCM audio stream and performs sampling frequency conversion, multi-channel downmixing, and requantization of the decoded audio data based on the audio control signal; and Decoding the output compression-coded audio stream by a corresponding decompression algorithm, and performing sampling frequency conversion, multi-channel downmixing, and requantization processing on the decoded audio data based on the audio control signal. data DVD Audio disc playback apparatus according to claim 10, characterized in that it is composed of a decoder. 12. A directory of video_TS and audio_TS is located in a disc information area of the disc,
AMG location information is recorded in the audio TS directory, location information of each audio title of the disc is recorded in the AGM, and the audio title is A
The audio stream attribute of the ATSI is composed of a TSI_MAT and a plurality of AOBs, and the ATSI audio stream attribute is related to an audio encoding mode, first to third quantization bits, first to sixth sampling frequencies, and a number of audio channels. Algorithm information is recorded,
An apparatus for playing DVD audio comprising an audio pack in which audio data corresponding to a decoding algorithm recorded in the audio stream attribute is stored in the AOB, receiving data to receive data reproduced from the disc And checking the received audio_TS information, and if valid data exists, performs a DVD audio playback mode, and based on the received audio data information, an audio encoding mode, a sampling frequency, and the number of channels. And an audio control signal including quantization information and the like, and if there is no valid data in the audio_TS, a control unit for performing a DVD video playback mode; and a data reception unit by mode control output from the control unit. Output video A stream parser that separates and outputs data and audio data; a video decoding unit that decodes and outputs video data output from the stream parser during the DVD playback mode control from the control unit; and a video output unit that is output from the decoding unit. A video output unit for converting video data into an analog video signal after NTSC encoding, and outputting the analog video signal; and a number of decoding units. An audio decoding unit that selects the decoding unit, decodes the received audio data, and performs multi-channel mixing, sampling frequency conversion, and requantization processing on the decoded audio data based on an audio control signal; Audio data from analog audio DVD audio disc reproducing apparatus characterized in that it is composed of an audio output unit for converting the signal. 13. A stream selector for selecting an audio stream received according to the audio encoding mode control signal and outputting the selected audio stream to a corresponding decoder, and an output from the stream selector. A linear PCM decoding unit that decodes a linear PCM audio stream and performs sampling frequency conversion, multi-channel downmixing, and requantization of the decoded audio data based on the audio control signal; and Decoding the output compression-coded audio stream by a corresponding decompression algorithm, and performing sampling frequency conversion, multi-channel downmixing, and requantization processing on the decoded audio data based on the audio control signal. Data recovery DVD Audio disc playback apparatus according to claim 12, characterized in that it is composed of the No. section. 14. A directory of video_TS and audio_TS is located in a disc information area of the disc,
The audio_TS directory records the position information of the AMG, the AGM records the position information of each audio title of the disc, and the audio title is continuously connected to the ATSI_MAT and a number of AOBs. In the attribute, decoding algorithm information related to the audio encoding mode, the first to third quantization bits, the first to sixth sampling frequencies, and the number of audio channels is recorded, and the AOB is recorded in the audio stream attribute. A method for reproducing DVD audio comprising an audio pack storing audio data corresponding to a decoding algorithm, comprising: determining an AMG position when valid data is recorded in the audio_TS; Serial to examine the entire information of the disk from the information of AMG, the AM at the time of title playback request
After grasping the position of the corresponding audio title based on the position information of G, the data of the corresponding audio title position is read, the ATSI_MAT is read, and the ATSI_MAT is read.
A DVD audio reproducing method, comprising: reading an audio stream attribute of SI_MAT, setting an audio decoder so as to perform a reproduction algorithm for reproducing the relevant audio title, and then reproducing the relevant audio title.