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BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a recording medium such as a digital video disc, or a digital versatile disc (DVD). Also, this invention relates to an apparatus for encoding an audio signal. Furthermore, this invention relates to an apparatus for
decoding an audio signal. In addition, this invention relates to an optical disc player such as a DVD (digital video disc) player.
2. Description of the Related Art
Optical discs for storing information include digital video discs (DVD's). A standard DVD stores a combination of an audio signal and a video signal. The audio-signal recording capacity of the standard DVD is significantly smaller than the
video-signal recording capacity thereof. It is difficult to manage time-related information of the audio signal recorded on the standard DVD. It is difficult to read out information of the titles of tunes represented by the audio signal recorded on the
standard DVD.
SUMMARY OF THE INVENTION
It is a first object of this invention to provide an improved recording medium.
It is a second object of this invention to provide an improved apparatus for encoding an audio signal.
It is a third object of this invention to provide an improved apparatus for decoding an audio signal.
It is a fourth object of this invention to provide an improved optical disc player.
A first aspect of this invention provides a digital signal recording disc comprising a first area storing a first-channel digital audio signal and a second-channel digital audio signal, the first-channel digital audio signal resulting from
quantizing a first-channel analog audio signal with a first quantization bit number, the second-channel digital audio signal resulting from quantizing a second-channel analog audio signal with a second quantization bit number; and a second area differing
from the first area and storing information of the first and second quantization bit numbers.
A second aspect of this invention is based on the first aspect thereof, and provides a digital signal recording disc wherein the first-channel digital audio signal comprises a front-channel digital audio signal and the second channel digital
audio signal comprises a rear-channel digital audio signal, and the first and second quantization bit numbers are different from each other.
A third aspect of this invention provides a digital signal recording disc comprising a first area storing a first-channel digital audio signal and a second-channel digital audio signal, the first-channel digital audio signal resulting from an
analog-to-digital conversion of a first-channel analog audio signal at a first sampling frequency, the second-channel digital audio signal resulting from an analog-to-digital conversion of a second-channel analog audio signal at a second sampling
frequency; and a second area differing from the first area and storing information of the first and second sampling frequencies.
A fourth aspect of this invention is based on the third aspect thereof, and provides a digital signal recording disc wherein the first-channel digital audio signal comprises a front-channel digital audio signal and the second-channel digital
audio signal comprises a rear-channel digital audio signal, and the first and second sampling frequencies are different from each other.
A fifth aspect of this invention is based on the third aspect thereof, and provides a digital signal recording disc wherein the first-channel digital audio signal comprises a front-channel digital audio signal and the second-channel digital audio
signal comprises a rear-channel digital audio signal, and the first and second sampling frequencies are equal to each other, and wherein the rear-channel digital audio signal results from thinning (decimation), and the second area stores information of
the thinning (the decimation).
A sixth aspect of this invention is based on the third aspect thereof, and provides a digital signal recording disc wherein the first-channel digital audio signal comprises a front-channel digital audio signal and the second-channel digital audio
signal comprises a low-frequency-effect-channel digital audio signal, and the first and second sampling frequencies are equal to each other, and wherein the low-frequency-effect-channel digital audio signal results from thinning, and the second area
stores information of the thinning.
A seventh aspect of this invention provides a digital signal recording disc comprising a first area storing a first-channel digital audio signal and a second-channel digital audio signal, the first-channel digital audio signal resulting from an
analog-to-digital conversion of a first-channel analog audio signal at a first sampling frequency and a first quantization bit number, the second-channel digital audio signal resulting from an analog-to-digital conversion of a second-channel analog audio
signal at a second sampling frequency and a second quantization bit number, the second sampling frequency differing from the first sampling frequency, the second quantization bit number differing from the first quantization bit number; and a second area
differing from the first area and storing information of the first and second sampling frequencies and also information of the first and second quantization bit numbers.
An eighth aspect of this invention provides a digital signal recording disc comprising a first area storing at least first-channel and second-channel digital audio signals each assigned to either a first channel group or a second channel group,
the digital audio signal in the first channel group resulting from an analog-to-digital conversion of a first analog audio signal at a first sampling frequency and a first quantization bit number, the digital audio signal in the second channel group
resulting from an analog-to-digital conversion of a second analog audio signal at a second sampling frequency and a second quantization bit number; and a second area differing from the first area and storing information of the first and second sampling
frequencies and information of the first and second quantization bit numbers, and also information of the assignment of the first-channel and second-channel digital audio signals to the first and second channel groups.
A ninth aspect of this invention is based on the seventh aspect thereof, and provides a digital signal recording disc wherein the first area stores left-channel and right-channel stereophonic digital audio signals, the left-channel and
right-channel stereophonic digital audio signals resulting from an analog-to-digital conversion of left-channel and right-channel stereophonic analog audio signals at a third sampling frequency, and wherein the second area stores information of the third
sampling frequency.
A tenth aspect of this invention is based on the seventh aspect thereof, and provides a digital signal recording disc wherein the first area stores left-channel and right-channel stereophonic digital audio signals, the left-channel and
right-channel stereophonic digital audio signals resulting from an analog-to-digital conversion of left-channel and right-channel stereophonic analog audio signals at a third quantization bit number, and wherein the second area stores information of the
third quantization bit number.
An eleventh aspect of this invention is based on the ninth aspect thereof, and provides a digital signal recording disc wherein the left-channel and right-channel stereophonic digital audio signals differ from the first-channel and second-channel
digital audio signals, and the first area comprises a first sub area storing the first-channel and the second-channel digital audio signals and a second sub area storing the left-channel and right-channel stereophonic digital audio signals.
A twelfth aspect of this invention is based on the seventh aspect thereof, and provides a digital signal recording disc wherein the first-channel and second-channel digital audio signals result from an encoding process selected from among an AC-3
encoding process, an MPEG-1 encoding process, and an MPEG-2 encoding process.
A thirteenth aspect of this invention provides an audio-signal encoding apparatus comprising first means for quantizing a front-channel analog audio signal into a corresponding front-channel digital audio signal at a first quantization bit
number; second means for quantizing a rear-channel analog audio signal into a corresponding rear-channel digital audio signal at a second quantization bit number differing from the first quantization bit number; and third means for formatting the
front-channel digital audio signal, the rear-channel digital audio signal, and information of the first and second quantization bit numbers into a structure having first and second areas, the first area containing the front-channel digital audio signal
and the rear-channel digital audio signal, the second area differing from the first area and containing the information of the first and second quantization bit numbers.
A fourteenth aspect of this invention provides an audio-signal encoding apparatus comprising first means for quantizing a front-channel analog audio signal into a corresponding front-channel digital audio signal at a first sampling frequency;
second means for quantizing a rear-channel analog audio signal into a corresponding rear-channel digital audio signal at a second sampling frequency differing from the first sampling frequency; and third means for formatting the front-channel digital
audio signal, the rear-channel digital audio signal, and information of the first and second sampling frequencies into a structure having first and second areas, the first area containing the front-channel digital audio signal and the rear-channel
digital audio signal, the second area differing from the first area and containing the information of the first and second sampling frequencies.
A fifteenth aspect of this invention provides an audio-signal encoding apparatus comprising first means for quantizing a front-channel analog audio signal into a corresponding front-channel digital audio signal at a first quantization bit number
and a first sampling frequency; second means for quantizing a rear-channel analog audio signal into a corresponding rear-channel digital audio signal at a second quantization bit number and a second sampling frequency, the second quantization bit number
differing from the first quantization bit number, the second sampling frequency differing from the first sampling frequency; and third means for formatting the front-channel digital audio signal, the rear-channel digital audio signal, information of the
first and second quantization bit numbers, and information of the first and second sampling frequencies into a structure having first and second areas, the first area containing the front-channel digital audio signal and the rear-channel digital audio
signal, the second area differing from the first area and containing the information of the first and second quantization bit numbers and the information of the first and second sampling frequencies.
A sixteenth aspect of this invention provides an audio-signal encoding apparatus comprising first means for assigning each of first-channel and second-channel analog audio signals to either a first channel group or a second channel group; second
means for quantizing the analog audio signal in the first channel group into a corresponding digital audio signal in the first channel group at a first sampling frequency and a first quantization bit number; third means for quantizing the analog audio
signal in the second channel group into a corresponding digital audio signal in the second channel group at a second sampling frequency and a second quantization bit number; and fourth means for formatting the digital audio signals in the first and
second channel groups, information of the first and second quantization bit numbers, information of the first and second sampling frequencies, and information of the assignment of the first-channel and second-channel analog audio signals to the first.and
second channel groups into a structure having first and second areas, the first area containing the digital audio signals of the first and second channel groups, the second area differing from the first area and containing the information of the first
and second quantization bit numbers, the information of the first and second sampling frequencies, and the information of the assignment of the first-channel and second-channel analog audio signals to the first and second channel groups.
A seventeenth aspect of this invention provides an audio-signal decoding apparatus comprising first means for extracting information of a first quantization bit number for a front channel and information of a second quantization bit number for a
rear channel from a reproduced signal, the second quantization bit number differing from the first quantization bit number; second means for deriving a front-channel digital audio signal and a rear-channel digital audio signal from the reproduced signal;
third means for decoding the front-channel digital audio signal in response to the information of the first quantization bit number; and fourth means for decoding the rear-channel digital audio signal in response to the information of the second
quantization bit number.
An eighteenth aspect of this invention provides an audio-signal decoding apparatus comprising first means for extracting information of a first sampling frequency for a front channel and information of a second sampling frequency for a rear
channel from a reproduced signal, the second sampling frequency differing from the first sampling frequency; second means for deriving a front-channel digital audio signal and a rear-channel digital audio signal from the reproduced signal; third means
for decoding the front-channel digital audio signal in response to the information of the first sampling frequency; and fourth means for decoding the rear-channel channel digital audio signal in response to the information of the second sampling
frequency.
A nineteenth aspect of this invention provides an audio-signal decoding apparatus comprising first means for extracting information of a first quantization bit number and a first sampling frequency for a front channel and information of a second
quantization bit number and a second sampling frequency for a rear channel from a reproduced signal, the second quantization bit number differing from the first quantization bit number, the second sampling frequency differing from the first sampling
frequency; second means for deriving a front-channel digital audio signal and a rear-channel digital audio signal from the reproduced signal; third means for decoding the front-channel digital audio signal in response to the information of the first
quantization bit number and the first sampling frequency; and fourth means for decoding the rear-channel digital audio signal in response to the information of the second quantization bit number and the second sampling frequency.
A twentieth aspect of this invention provides an audio-signal decoding apparatus comprising first means for extracting information of a first quantization bit number and a first sampling frequency for a first channel group and information of a
second quantization bit number and a second sampling frequency for a second channel group from a reproduced signal, the second quantization bit number differing from the first quantization bit number, the second sampling frequency differing from the
first sampling frequency; second means for deriving a first-channel digital audio signal and a second-channel digital audio signal from the reproduced signal, each of the derived first-channel and second-channel digital audio signals being assigned to
either the first channel group or the second channel group; third means for extracting information of the assignment of the first-channel and second-channel digital audio signals to the first and second channel groups from the reproduced signal; and
fourth means for decoding the first-channel digital audio signal and the second-channel digital audio signal in response to the information of the first and second quantization bit numbers, the information of the first and second sampling frequencies,
and the information of the assignment of the first-channel and second-channel digital audio signals to the first and second channel groups.
A twenty-first aspect of this invention provides an optical disc player comprising first means for reproducing audio packs and control packs from an optical disc; first and second buffers; second means for alternately writing the reproduced audio
packs into the first and second buffers; third means for decoding the reproduced control packs into control data; fourth means for decoding the audio packs in the first and second buffers into audio data in response to the control data; and a D/A
converter for converting the audio data into an analog audio signal.
A twenty-second aspect of this invention is based on the twenty-first aspect thereof, and provides an optical disc player wherein each of the first and second buffers has a capacity of 4 kilobytes.
A twenty-third aspect of this invention is based on the eighth aspect thereof, and provides a digital signal recording disc wherein the first area stores audio data in an audio packet, and the second area stores audio data information ADI in the
audio packet.
A twenty-fourth aspect of this invention is based on the eighth aspect thereof, and provides a digital signal recording disc wherein the first area comprises an audio contents block set ACBS, and the second area stores an audio-only-title
audio-object attribute AOTT-AOB-ATR in audio title set information ATSI.
A twenty-fifth aspect of this invention is based on the sixteenth aspect thereof, and provides an audio-signal encoding apparatus further comprising fifth means for formatting the digital audio signals into audio data in audio packets; and sixth
means for formatting the information of the first and second sampling frequencies, the information of the first and second quantization bit numbers, and the information of the assignment of the first-channel and second-channel analog audio signals to the
first and second channel groups into audio data information ADI in the audio packets.
A twenty-sixth aspect of this invention is based on the sixteenth aspect thereof, and provides an audio-signal encoding apparatus further comprising fifth means for formatting the digital audio signals into an audio contents block set ACBS; and
sixth means for formatting the information of the first and second sampling frequencies, the information of the first and second quantization bit numbers, and the information of the assignment of the first-channel and second-channel analog audio signals
to the first and second channel groups into an audio-only-title audio-object attribute AOTT-AOB-ATR in audio title set information ATSI.
A twenty-seventh aspect of this invention is based on the twentieth aspect thereof, and provides an audio-signal decoding apparatus wherein the first means comprises means for reproducing the information of the first quantization bit number and
the first sampling frequency, and the information of the second quantization bit number and the second sampling frequency from audio data information ADI in an audio packet, and wherein the third means comprises means for reproducing the information of
the assignment of the first-channel and second-channel digital audio signals to the first and second channel group from the audio data information ADI in the audio packet.
A twenty-eighth aspect of this invention is based on the twentieth aspect thereof, and provides an audio-signal decoding apparatus wherein the first means comprises means for reproducing the information of the first quantization bit number and
the first sampling frequency, and the information of the second quantization bit number and the second sampling frequency from an audio-only-title audio-object attribute AOTT-AOB-ATR in audio title set information ATSI, and wherein the third means
comprises means for reproducing the information of the assignment of the first-channel and second-channel digital audio signals to the first and second channel group from the audio-only-title audio-object attribute AOTT-AOB-ATR in audio title set
information ATSI.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a diagram of the signal recording format of a DVD-Video.
FIG. 2 is a diagram of the signal recording format of a DVD-Audio according to a first embodiment of this invention.
FIG. 3 is a diagram of the structure of an AMG area in FIG. 2.
FIG. 4 is a diagram of the structure of an ATS area in FIG. 2.
FIG. 5 is a diagram of the structure of an AMGI area in FIG. 3.
FIG. 6 is a diagram of the structure of an ATS-ATRT area in FIG. 5.
FIG. 7 is a diagram of the structure of an ATS-ATR area in FIG. 6.
FIG. 8 is a diagram of the structure of an ATSI area in FIG. 4.
FIG. 9 is a diagram of the structure of an ATSI-MAT area in FIG. 8.
FIG. 10 is a diagram of the structure of an ATSM-AST-ATR area in FIG. 9.
FIG. 11 is a diagram of the structure of an ATS-AST-ATRT area in FIG. 9.
FIG. 12 is a diagram of the structure of an ATS-AST-ATR area in FIG. 11.
FIG. 13 is a diagram of a sequence of packs.
FIG. 14 is a diagram of the structure of an audio pack A or a video pack V.
FIG. 15 is a diagram of the structure of an audio control pack A-CONT.
FIG. 16 is a diagram of the structure of an ACD area in FIG. 15.
FIG. 17 is a diagram of the indication of an English-added Japanese tune name.
FIG. 18 is a diagram of the structure of an ASD area in FIG. 15.
FIG. 19 is a diagram of a sequence of packs.
FIG. 20 is a diagram of the relation among channels, sampling frequencies, quantization bit numbers, data rates, and longest recording times.
FIG. 21 is a diagram of the relation among channels, sampling frequencies, quantization bit numbers, data rates, and longest recording times in the case of a 2-channel plus 6-channel audio signal.
FIG. 22 is a diagram of the relation among channels, sampling frequencies, quantization bit numbers, data rates, and longest recording times in the case of a 2-channel plus 5-channel audio signal.
FIG. 23 is a diagram of the relation among channels, sampling frequencies, quantization bit numbers, data rates, and longest recording times in the case of a 6-channel audio signal.
FIG. 24 is a diagram of a DVD-Audio.
FIG. 25 is a diagram of the structure of an ACD area.
FIG. 26 is a diagram of the signal recording format of a DVD-Audio according to a second embodiment of this invention.
FIG. 27 is a diagram of a sequence of packs.
FIG. 28 is a diagram of the signal recording format of a DVD-Van.
FIG. 29 is a diagram of the signal recording format of a DVD-Video.
FIG. 30 is a diagram of the signal recording format of a DVD-Avd.
FIG. 31 is a diagram of the structure of an AOTT-AOB-ATR area.
FIG. 32 is a diagram of channel assignment.
FIG. 33 is a diagram of the structure of a linear PCM audio pack.
FIG. 34 is a diagram of the structure of an ADI area in FIG. 33.
FIG. 35 is a diagram of the structure of an AOTT-VOB-AST-ATR area.
FIG. 36 is a block diagram of an audio-signal encoding apparatus according to a third embodiment of this invention.
FIG. 37 is a block diagram of a signal processing circuit in FIG. 36.
FIG. 38 is a block diagram of a DVD-Audio player including an audio-signal decoding apparatus according to a fourth embodiment of this invention.
FIG. 39 is a block diagram of a DVD-Audio player including an audio-signal decoding apparatus according to a fifth embodiment of this invention.
FIG. 40 is a block diagram of a DVD-Audio player including an audio-signal decoding apparatus according to a sixth embodiment of this invention.
FIG. 41 is a block diagram of a DVD-Audio player including an audio-signal decoding apparatus according to a seventh embodiment of this invention.
FIG. 42 is a block diagram of an optical disc player according to an eighth embodiment of this invention.
FIG. 43 is a block diagram of an optical disc player according to a ninth embodiment of this invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
First Embodiment
FIG. 1 shows the signal recording format of a DVD-Video (digital video disc-video). As shown in FIG. 1, the DVD-Video has a first area assigned to a video manager VMG. The VMG area is followed by a sequence of second and later areas assigned to
video title sets VTS respectively.
Each VTS area has a sequence of an area assigned to VTS information VTSI, one or more areas assigned to respective video contents block sets VCBS, and an area assigned to VTS information VTSI. The first video contents block set VCBS stores menu
information for indicating a menu picture.
Each VCBS area has a sequence of areas assigned to video contents blocks VCB respectively. Each video contents block VCB corresponds to one video title.
Each VCB area has a sequence of areas corresponding to chapters respectively. Each chapter contains information representing a part of a title which is denoted by PTT.
Each chapter has a sequence of cells. Each cell has a sequence of VCB units VCBU. Each VCB unit VCBU has a sequence of packs. Each pack has 2,048 bytes.
In each VCB unit VCBU, a first pack is a control pack CONT followed by a sequence of packs including video packs V, audio packs A, and sub picture packs SP. The control pack CONT is assigned to information for controlling video packs V following
the control pack CONT. The control information includes video-pack-synchronizing information. Each audio pack is assigned to audio data.
FIG. 2 shows the signal recording format of a DVD-Audio (digital video disc-audio) according to a first embodiment of this invention. The DVD-Audio is compatible with a DVD-Video (see FIG. 1). As shown in FIG. 2, the DVD-Audio has a first area
assigned to an audio manager AMG. The AMG area is followed by a sequence of second and later areas assigned to audio title sets ATS respectively.
Each ATS area has a sequence of an area assigned to ATS information ATSI, one or more areas assigned to respective audio contents block sets ACBS, and an area assigned to ATS information ATSI. The ATS information ATSI indicates play time lengths
of respective tunes represented by audio data in the audio contents block sets ACBS. The play time lengths of the respective tunes are expressed in terms of real time. The first audio contents block set ACBS stores menu information for indicating a
menu picture.
Each ACBS area has a sequence of areas assigned to audio contents blocks ACB respectively. Each audio contents block ACB corresponds to one audio title.
Each ACB area has a sequence of areas corresponding to tracks respectively. Each track contains information representing a part of a title which is denoted by PTT.
Each track has a sequence of indexes (cells). Each index has a sequence of ACB units ACBU. Each ACB unit ACBU has a sequence of packs. Each pack has 2,048 bytes.
In each ACB unit ACBU, a first pack is an audio control pack A-CONT followed by a sequence of packs including audio packs A1 and A2 and video packs V. The audio control pack A-CONT is assigned to information for managing an audio signal (audio
data) in audio packs A1 and A2 following the audio control pack A-CONT. The managing information in the audio control pack A-CONT is basically similar to TOC (table of contents) information in a compact disc (CD). The managing information contains
audio-pack-synchronizing information. Each audio pack A1 or A2 is assigned to audio data. The video packs V are assigned to video data and non-audio data such as closed caption (CC) data. The video packs V may be omitted from the ACB unit ACBU.
It should be noted that each ACB unit ACBU may further include a control pack CONT.
As shown in FIG. 3, the AMG area (see FIG. 2) stores audio manager information AMGI, an audio contents block set AMGM-ACBS for an AMG menu, and backup audio manager information AMGI. The audio manager information AMGI has TOC (table of contents)
information. The audio contents block set AMGM-ACBS has presentation control information PCI and data search information DSI which are control information pieces respectively.
As shown in FIG. 4, the ATS area (see FIG. 2) stores audio title set information ATSI, an audio contents block set ATSM-ACBS for an ATS menu, an audio contents block set ATSA-ACBS for an ATS title, and backup audio title set information ATSI.
The audio title set information ATSI has TOC (table of contents) information. Each of the audio contents block sets ATSM-ACBS and ATSA-ACBS has presentation control information PCI and data search information DSI.
As shown in FIG. 5, the audio manager information AMGI (see FIG. 3) has a management table AMGI-MAT therefor, a title search pointer table T-SRPT, an audio manager menu program chain information unit table AMGM-PGCI-UT, a parental management
information table PTL-MAIT, an audio title set attribute table ATS-ATRT, a text data manager TXTDT-MG, an audio manager menu cell (index) address table AMGM-C-ADT, and an audio manager menu audio contents block unit address map AMGM-ACBU-ADMAP.
As shown in FIG. 6, the audio title set attribute table ATS-ATRT (see FIG. 5) has audio title set attribute table information ATS-ATRTI, audio title set attribute search pointers ATS-ATR-SRP#1, ATS-ATR-SRP#2, . . . , ATS-ATR-SRP#n for respective
"n" audio title sets ATS, and audio title set attribute data pieces ATS-ATR-#1, ATS-ATR-#2, . . . , ATS-ATR-#n for the respective "n" audio title sets ATS.
As shown in FIG. 7, each of the audio title set attribute data pieces ATS-ATR-#1, ATS-ATR-#2, . . . , ATS-ATR-#n (see FIG. 6) represents an end address ATS-ATR-EA of the audio title set attribute, a category ATS-CAT of the audio title set, and
audio title set attribute information ATS-ATRI.
As shown in FIG. 8, the audio title set information ATSI (see FIG. 4) has a management table ATSI-MAT for the audio title set information ATSI, a part-of-title search pointer table ATS-PTT-SRPT for the audio title set, a program chain information
table ATS-PGCIT for the audio title set, a PGCI unit table ATSM-PGCI-UT for the audio title set menu, a time map table ATS-TMAPT for the audio title set, a cell (index) address table ATSM-C-ADT for the audio title set menu, an audio contents block unit
address map ATSM-ACBU-ADMAP for the audio title set menu, a cell (index) address table ATS-C-ADT for the audio title set, and an audio contents block unit address map ATS-ACBU-ADMAP for the audio title set.
As shown in FIG. 9, the audio title set information management table ATSI-MAT (see FIG. 8) has an identifier ATS-ID for the audio title set, an end address ATS-EA of the audio title set, an end address ATSI-EA for the audio title set information,
a version number VERN of the specifications of the DVD-Audio, a category ATS-CAT of the audio title set, an end address ATSI-MAT-EA of the audio title set information management table, a start address ATSM-ACBS-SA of the ATS menu audio contents block
set, a start address ATSA-ACBS-SA of the ATS title audio contents block set, a start address ATS-PTT-SRPT-SA of the audio title set part-of-title search pointer table, a start address ATS-PGCIT-SA of the audio title set program chain information table, a
start address ATSM-PGCI-UT-SA of the audio title set menu program chain information unit table, a start address ATS-TMAPT-SA of the audio title set time map table, a start address ATSM-C-ADT-SA of the audio title set menu cell address table, a start
address ATSM-ACBU-ADMAP-SA of the ATS menu audio contents block unit address map, an ATS menu audio stream attribute ATSM-AST-ATR, the number ATS-AST-Ns of audio streams in the audio title set, and an ATS audio stream attribute table ATS-AST-ATRT.
As shown in FIG. 10, the ATS menu audio stream attribute ATSM-AST-ATR (see FIG. 9) has a sequence of 8 bytes, that is, 64 bits b63, b62, b61, . . . , b1, b0. A set of the bits b63, b62, and b61 represents an audio encoding mode selected from
among a Dolby AC-3 encoding mode, an encoding mode corresponding to MPEG-1 or MPEG-2 without any extension bit stream, an encoding mode corresponding to MPEG-2 with an extension bit stream, a first linear PCM audio encoding mode, and a second linear PCM
audio encoding mode. The second linear PCM audio encoding mode is of a type containing a sub type corresponding to 2 channels plus 5 channels, a sub type corresponding to 2 channels plus 6 channels, and a sub type corresponding to 2 channels plus 8
channels. Specifically, a bit sequence of "000" is assigned to the Dolby AC-3 encoding mode. A bit sequence of "010" is assigned to the encoding mode corresponding to MPEG-1 or MPEG-2 without any extension bit stream. A bit sequence of "011" is
assigned to the encoding mode corresponding to MPEG-2 with an extension bit stream. A bit sequence of "100" is assigned to the first linear PCM audio encoding mode. A bit sequence of "101" is assigned to the second linear PCM audio encoding mode.
A set of the bits b55 and b54 in the ATS menu audio stream attribute ATSM-AST-ATR represents information of quantization/dynamic range control (DRC). When the audio encoding mode is "000", the information of quantization/DRC is set to "11".
When the audio encoding mode is "010" or "011", a bit sequence of "00" which relates to the information of quantization/DRC represents the absence of dynamic control data from the MPEG audio stream. When the audio encoding mode is "010" or "11", a bit
sequence of "01" which relates to the information of quantization/DRC represents the presence of dynamic control data in the MPEG audio stream. When the audio encoding mode is "100" or "101", a bit sequence of "00" which relates to the information of
quantization/DRC represents that each of channels (two stereophonic channels) has 16 bits for every signal sample. When the audio encoding mode is "100" or "101", a bit sequence of "01" which relates to the information of quantization/DRC represents
that each of channels (two stereophonic channels) has 20 bits for every signal sample. When the audio encoding mode is "100" or "101", a bit sequence of "10" which relates to the information of quantization/DRC represents that each of channels (two
stereophonic channels) has 24 bits for every signal sample.
A set of the bits b53 and b52 in the ATS menu audio stream attribute ATSM-AST-ATR represents a sampling frequency "fs" related to each of two stereophonic channels. Specifically, a bit sequence of "00" indicates that the sampling frequency "fs"
is equal to 48 kHz. A bit sequence of "01" indicates that the sampling frequency "fs" is equal to 96 kHz. A bit sequence of "10" indicates that the sampling frequency "fs" is equal to 192 kHz.
A set of the bits b50, b49, and b48 in the ATS menu audio stream attribute ATSM-AST-ATR represents the number of audio channels. Specifically, a bit sequence of "000" indicates that there is only one channel ("monaural"). A bit sequence of
"001" indicates that there are two stereophonic channels. A bit sequence of "010" indicates that there are three channels. A bit sequence of "011" indicates that there are four channels. A bit sequence of "100" indicates that there are two
stereophonic channels plus five channels. A bit sequence of "101" indicates that there are two stereophonic channels plus six channels. A bit sequence of "110" indicates that there are seven channels. A bit sequence of "111" indicates that there are
two stereophonic channels plus eight channels.
As shown in FIG. 11, the ATS audio stream attribute table ATS-AST-ATRT (see FIG. 9) has attributes ATS-AST-ATR of respective ATS audio streams ATS-AST#0, ATS-AST#1, . . . , ATS-AST#7. Each of the ATS audio stream attributes ATS-AST-ATR has 8
bytes. Accordingly, the total number of bytes representing the ATS audio stream attribute table ATS-AST-ATRT is equal to 64.
As shown in FIG. 12, each ATS audio stream attribute ATS-AST-ATR (see FIG. 11) has a sequence of 8 bytes, that is, 64 bits b63, b62, b61, . . . , b1, b0. A set of the bits b63, b62, and b61 in the ATS audio stream attribute ATS-AST-ATR
represents an audio encoding mode as in the ATS menu audio stream attribute ATSM-AST-ATR (see FIG. 10). A set of the bits b55 and b54 in the ATS audio stream attribute ATS-AST-ATR represents information of quantization/dynamic range control (DRC) as in
the ATS menu audio stream attribute ATSM-AST-ATR (see FIG. 10). A set of the bits b53 and b52 in the ATS audio stream attribute ATS-AST-ATR represents a sampling frequency "fs" as in the ATS menu audio stream attribute ATSM-AST-ATR (see FIG. 10). A set
of the bits b50, b49, and b48 in the ATS audio stream attribute ATS-AST-ATR represents the number of audio channels as in the ATS menu audio stream attribute ATSM-AST-ATR (see FIG. 10).
The bit b60 in the ATS audio stream attribute ATS-AST-ATR represents information of multichannel extension ME. A set of the bits b59 and b58 in the ATS audio stream attribute ATS-AST-ATR represents an audio type.
A set of the bits b57 and b56 in the ATS audio stream attribute ATS-AST-ATR represents an audio application mode. Specifically, a bit sequence of "01" indicates a karaoke mode. A bit sequence of "10" indicates a surround mode. A bit sequence
of "11" indicates a 2-channel plus surro | | |
