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DESCRIPTION JP2009015885

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DESCRIPTION JP2009015885
PROBLEM TO BE SOLVED: To adjust the mixing balance of main sound and sub sound according
to the request of a viewer (user). SOLUTION: In this audio mixing customization method, a main
audio stream and a sub audio stream are decoded, and the decoded main audio and sub audio are
mixed and output. In this method, when both the main audio stream and the sub audio stream
are decoded (S01Y), mixing adjustment between the main audio obtained by decoding the main
audio stream and the sub audio obtained by decoding the sub audio stream is performed. It
notifies that it is possible (S06Y). Then, when there is an operation to change the mixing balance
between the decoded main audio and the decoded sub audio (S 18 Y or S 20 Y), the mixing
coefficient is updated according to this operation, and is set according to the updated mixing
coefficient The decoded main audio and the decoded sub audio are output with mixing balance.
[Selected figure] Figure 2
Method and apparatus for customizing voice mixing
[0001]
The present invention relates to a method and apparatus for customizing audio mixing. In
particular, the present invention relates to a method and apparatus for customizing audio mixing
in the case of playing back media of digital AV content that can separately include main audio
and sub audio separately, such as HD DVD video.
[0002]
10-04-2019
1
As an example of an apparatus for mixing main audio and background audio, there is an audio
mixing apparatus disclosed in Patent Document 1. Further, as an example of an apparatus for
processing a moving image stream including main audio data and sub audio data, there is a
reproduction apparatus disclosed in Patent Document 2. Unexamined-Japanese-Patent No. 785586 gazette. Japanese Patent Publication No. 2006-191239.
[0003]
In Patent Document 1, the main audio signal and the background audio signal are supplied to an
adder via each regulator in a mixing circuit and mixed. Patent Document 2 includes a mixer
circuit that mixes and outputs the first audio data and the second audio data decoded by the
audio decoder circuit.
[0004]
Patent Document 1 discloses mixing adjustment of audio, and Patent Document 2 discloses an
apparatus for mixing and reproducing main audio and sub audio with HD_DVD. However, when
the audio mixing adjustment depends on the content, there is a problem that the user can not
know whether or not the audio mixing adjustment is possible.
[0005]
For example, when reproducing main audio and sub audio recorded on an HD DVD video disc,
the presence or absence of information for adjusting the mixing balance of the main audio and
sub audio is up to the creator of the content. In the case of content without information to adjust
the mixing balance of main audio and sub audio, the mixing balance of main audio and sub audio
that each playback device plays by default is not necessarily optimal for individual viewers
(users) The That is, even if it is assumed that the content provider is in a proper balance, the
audience's hearing and preferences vary widely, so some people may feel that the sub audio is
too loud for the main audio, conversely, the sub audio There are still things that are difficult to
hear.
[0006]
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2
One of the problems of the present invention is to enable the mixing balance to be realized
according to the request of the viewer (user) even in the case of the content without information
for adjusting the mixing balance of the main sound and the sub sound.
[0007]
In the audio mixing customization method according to one embodiment of the present
invention, for example, a main audio stream and a sub audio stream corresponding to an
elementary stream constituting an MPEG program stream are decoded, and the decoded main
audio and sub audio are mixed. Output.
In this method, when both the main audio stream and the sub audio stream are decoded, mixing
adjustment between the main audio obtained by decoding the main audio stream and the sub
audio obtained by decoding the sub audio stream To notify (by image and / or voice) that it is
possible. Then, when there is an operation (a user operation using a remote control or the like)
that changes the mixing balance between the decoded main audio and the decoded sub audio, the
mixing coefficient is updated according to this operation, and the updated mixing is performed.
The decoded main audio and the decoded sub audio are output with the mixing balance set
according to a coefficient.
[0008]
Even in the case of content without information for adjusting the mixing balance of the main
audio and the sub audio, it is possible to realize the mixing balance according to the request of
the viewer (user).
[0009]
Hereinafter, various embodiments of the present invention will be described with reference to the
drawings.
First, some terms related to this embodiment will be described.
[0010]
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3
Track: A logical existence for an elementary stream in a playback object selected during playback
of a title (one unit of recording content), such as a video track for video and an audio track for
audio. Main Audio stream (main audio stream): an audio stream to be decoded by the Main Audio
decoder (main audio decoding unit), and is present in Audio Track. Sub Audio stream (sub audio
stream): an audio stream to be decoded by a Sub Audio decoder (sub audio decoding unit), and is
present in Audio Track. Primary Audio Video (Primary Audio Video): A device that provides
playback streams such as Main Video, Main Audio, Sub Video, Sub Audio, and Subpicture (Sub
Video). Primary Video Set (Primary Video Set): A format for storing Primary Audio Video, and the
data structure of the Primary Video Set is Video Title Set Information (VTSI), Time Map (TMAP),
Primary Enhanced Video Object (P-EVOB), etc. Compliant with the Advanced VTS (Advanced
Video Title Set). (See the description of FIG. 6 for the Advanced VTS. ) Secondary Video Set
(Secondary Video Set) ... A Secondary Video Set can hold three types of playback objects
(Substitute Audio Video, Substitute Audio, and Secondary Audio Video), and can be used as a disk,
a network server, or a Persistent Storage (permanent storage). Device), a file cache in the
playback device, etc. The Secondary Video Set has a data structure in which the Advanced VTS is
simplified, and includes a Time Map (TMAP), a Secondary Enhanced Video Object (S-EVOB), and
the like.
[0011]
Enhanced Video Object (EVOB): An MPEG program stream configured by a group of elementary
streams, and there are Primary Enhanced Video Object (P-EVOB) and Secondary Enhanced Video
Object (S-EVOB).
[0012]
Audio Parameters: Includes parameters that are included as part of system parameters and can
be used to set the default audio output level (volume) of each playback device.
Specifically, Audio Parameters are Volume of Main Audio for Output (volume of main audio to be
output), Gain Value for Left Channel of Sub Audio mixing down into Output (sub-channel left gain
value of output mixed with output) ), Gain Value for Right Channel of Sub Audio mixing down
into Output (right channel gain value of sub audio mixed into output), Gain Value for Left
Channel of Effect of Audio mixing down into Output (of sound effect mixed into output) Left
channel gain value), Gain Value for Right Channel of Effect Audio mixing down into Output (right
channel gain value of sound effect mixed in output), and the like. Information corresponding to
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the Audio Parameters can be stored in the disc 1 described below.
[0013]
FIG. 6 shows an example of the data structure of a disc on which Enhanced Video Object (EVOB)
is recorded. As shown in FIG. 6B, the disk 1 of FIG. 6A has a lead-in area 10, a volume / file
structure information area 11, a data area 12, and a lead-out area 13 from the inner periphery
side. The volume space of the disk 1 is configured to include a volume / file structure
information area 11 and a data area 12 as shown in FIG. 6C. The data area 12 includes an
HD_DVD video area 14 and, as appropriate, other areas (areas that can be used for recording
information other than HD_DVD video) 15. The HD_DVD video area 14 includes a standard
content area 20 and an advanced content area 21. The standard content (Standard Content)
recorded in the standard content area 20 is composed of navigation data and a video object on a
disc, which is an extension of the conventional DVD video standard version 1.1.
[0014]
In the advanced content area 21, as shown in FIG. 6D, an advanced video title set (Advanced VTS)
50 and an advanced content (Advanced Content) 60 can be recorded.
[0015]
The advanced video title set 50 includes control data (video title set information VTSI), time map
information (VTS_TMAP), and an extended video object set for titles (VTSTT_EVOBS), as shown
in FIG. 6 (e).
The advanced video title set 50 is configured to be able to include backup files of VTSI and
VTS_TMAP, as appropriate. Although not shown, the time map information (VTS_TMAP) can
include one or more time map (TMAP) files, and the title extended video object set
(VTSTT_EVOBS) includes one or more extended video objects (EVOB). It can be included.
[0016]
As shown in FIGS. 6 (e) and 6 (f), the main audio and sub audio streams to be described later use
an audio pack for main audio (not shown) and an audio pack for sub audio (not shown). ,
Recorded in the extended video object set (VTSTT_EVOBS).
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5
[0017]
FIG. 1 is a block diagram for explaining the configuration of a playback apparatus according to
an embodiment of the present invention.
In the figure, a playback apparatus (HD_DVD player) 100 plays back the content (P-ESOB / SESOB) of the disc 1 and outputs audio and video obtained by predetermined processing to the
speaker 200 and the monitor TV 400. Is configured as.
[0018]
The disk drive / data input unit 102 reads the content (P-ESOB / S-ESOB) from the disk 1, and
according to the type of content, the main audio decoding unit 103, the sub audio decoding unit
104, the HD_DVD control unit 105, the main It transmits to the video part decode 106 and the
sub video decode part 107. Here, the HD_DVD control unit 105 incorporates a system parameter
memory 105 a including audio parameters and the like.
[0019]
The audio mixing unit 108 is a device that mixes down the audio data sent from the main audio
decoding unit 103 and the sub audio decoding unit 104. The synthesized voice data is sent to an
audio amplifier (not shown) via the voice output unit 110. By driving the speaker 200 with this
amplifier, a sound corresponding to the synthesized voice data is output.
[0020]
The GUI display control unit (On-Screen Display control unit) / audio synthesis unit 116
responds to a request from the HD_DVD control unit 105, the main / sub audio mixing
adjustment unit 111, etc., and sends a message or a graphical user interface (GUI). Has a function
to create image data. Furthermore, the GUI display control unit / voice synthesis unit 116 also
has a function of appropriately synthesizing the voice of the content corresponding to the
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message to be created. The main / sub audio mixing adjustment unit 111 may be mixing
information of the main audio / sub audio changed by the user (mainly volume information of
each audio, and may appropriately include phase information of sub audio with respect to the
main audio. And a mixing coefficient memory 111a for storing the signal.
[0021]
The video blending unit 109 is a device that combines the video data sent from the main video
unit decoding unit 106 and the sub video decoding unit 107. The video blending unit 109
further combines the video data synthesis data sent from the main video unit decoding unit 106
and the sub video decoding unit 107 with the image data generated by the GUI display control
unit / audio synthesizing unit 116. Do. The finally synthesized video data is displayed on the
monitor 400 through the video output unit 112.
[0022]
The HD_DVD control unit 105 controls HD_DVD playback, and performs playback according to
the content information of the content extracted from the data input unit 102. The remote
control 300 instructs the player 100 to perform user operations such as playback, stop, fast
forward / reverse, and skip. The functions of the configuration blocks 105, 111 and 116 in FIG. 1
can be realized by firmware of a microcomputer (MPU).
[0023]
The process of customizing the mixing balance of the main sound and the sub sound in the
system configuration of FIG. 1 will be described with reference to FIG. When the user does not do
anything (S100Y), the reproducing apparatus 100 of FIG. 1 reproduces the main sound and the
sub sound with the default mixing balance set by the audio parameter in the memory 105a
(S101). When the viewer (device user) does not like this default mixing balance (S 100 N), the
user customizes the mixing balance by pressing the mixing adjustment start button (300 b in FIG.
3) provided on the remote control 300 to go into.
[0024]
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7
That is, the apparatus 100 of FIG. 1 includes the main / sub audio mixing adjustment unit 111.
The main / sub audio mixing adjustment unit 111 determines whether or not an audio stream is
input to the main audio decoding unit 103 and the sub audio decoding unit 104 after the
reproduction of the disc 1 is started and both the main audio and the sub audio are decoded. It
determines (S01). If it is determined that the audio is not decoded by both the main audio
decoding unit 103 and the sub audio decoding unit 104 (S01 N), it is determined whether the
mixing adjustable message (401a in FIG. 3) is being displayed (S02) . If it is determined that the
mixing adjustable message is being displayed (S02Y), the mixing adjustable message is deleted
(S03), and if the reproduction is not ended (S102N), the process returns to S01. If it is
determined that the mixing adjustable message is not being displayed (S02N), it is determined
whether the mixing adjustment GUI is being displayed (S04). If it is determined that the mixing
adjustment GUI is being displayed (S04Y), the mixing adjustment GUI is deleted (S05), and if the
reproduction is not ended (S102N), the process returns to S01. If it is determined that the mixing
adjustment GUI is not being displayed (S04N), if the reproduction is not ended (S102N), the
process returns to S01.
[0025]
If it is determined that both the main audio and the sub audio are being decoded by both the
main audio decoding unit 103 and the sub audio decoding unit 104 (S01Y), whether or not the
mixing adjustment GUI is being displayed (and / or the mixing adjustment is possible) It is
determined whether or not voice guidance to notify the effect is being output (S06). If it is
determined that the mixing adjustment GUI is not being displayed (and / or voice guidance is not
being output) (S06N), whether a mixing adjustment enabled message is being displayed (and / or
voice guidance is being output) (S07). If it is determined that the mixing adjustable message is
not being displayed (and / or audio guidance is not being output) (S07N), the mixing adjustable
message is displayed (and / or the message is audio-guided) (S08), If the reproduction is not
completed (S102 N), the process returns to S01.
[0026]
If it is determined that the mixing adjustable message is being displayed (and / or voice guidance
is being output) (S07 Y), it is determined whether or not the mixing adjustment start has been
designated by the user operation (S09). This “mixing adjustment start designation” can be
performed by pressing (turning on) the mixing adjustment start button 300 b (FIG. 3) of the
remote controller 300.
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8
[0027]
If it is determined that the mixing adjustment start is designated (S09Y), the mixing adjustment
GUI (FIG. 4 or 5) is displayed (S10), and if the reproduction is not ended (S102N), the process
returns to S01. If it is determined that the mixing adjustment start is not designated (S09 N), if
the reproduction is not ended (S 102 N), the process returns to the process of S 01.
[0028]
If it is determined that the mixing adjustment GUI is being displayed (and / or voice guidance is
being output) (S06Y), the user is deleting the mixing adjustment GUI (and the remote control
button 300b * in FIG. 4 or 5 is on). It is determined whether or not stop of voice guidance is
specified (S11). If it is determined that the deletion of the mixing adjustment GUI (and / or the
stop of the voice guidance) is specified (S11 Y), the mixing adjustment GUI is deleted (and / or
the voice guidance is stopped) (S12), and the reproduction should be ended. (S102N), the process
returns to S01.
[0029]
When it is determined that the deletion of the mixing adjustment GUI (and / or the stop of voice
guidance) is not specified (S11 N), the right button (the remote control button 300d of FIG. 4 or
5) of the remote control 300 is pressed by the user operation. It is determined whether or not it
is (S18). If it is determined that the right button 300 d is pressed (S 18 Y), the main / sub audio
mixing coefficient is advanced by one to the sub side (S 19), and the process jumps to S 22.
When it is determined that the right button 300d is not pressed (S18 N), it is determined whether
the left button (the remote control button 300c of FIG. 4 or 5) is pressed by the user operation
(S20). If it is determined that the left button 300c is pressed (S20Y), the main / sub audio mixing
coefficient is advanced by one to the main side (S21), and the process jumps to S22. If it is
determined that the left button 300c is not pressed (S20N), if the reproduction is not ended
(S102N), the process returns to the process of S01.
[0030]
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9
In S22, the display of the mixing adjustment GUI is updated according to the mixing coefficient
(in the example of FIG. 4, the display position of the diamond mark indicating the mixing balance
point is changed). (And / or at S22, the content of the voice guidance is updated such that the
mixing balance point of the main voice and the sub voice is changed by + M steps more than
main or + N steps more than sub). Thereafter, the audio mixing unit 108 is controlled in
accordance with the updated mixing coefficient, and the main audio data from the main audio
decoding unit 103 and the sub audio data from the sub audio decoding unit 104 are synthesized
(S23). It returns to the process of S102 N) and S01.
[0031]
In the above-described embodiment, without the process of S100, if both the main audio and the
sub audio are decoded, the mixing adjustable message can be displayed unconditionally and the
audio mixing can be adjusted. It is also possible not to display the mixing adjustable message
401a of FIG. 3 by making it possible to specify On / Off of the audio mixing adjusting process by
the yes / no of S100.
[0032]
FIG. 3 is a view for explaining a display example of “mixing adjustable message” in the audio
mixing process according to the embodiment of the present invention.
Here, a GUI image 300a (including a mixing adjustment start button 300b) of the remote control
300 and a message 401a "Main / Sub sound adjustment possible" displayed on the upper right of
the main video image are illustrated. The user can know from the message 401 a (and / or voice
guidance corresponding to the message) that the balance between the main voice and the sub
voice currently being played can be changed. When the user who wants to change the balance
operates the remote control 300 at hand and presses the remote control button corresponding to
the button 300 b on the GUI, the mixing balance adjustment image 401 b of FIG. 4 is displayed
on the screen 400 b or The voice level bar graphs 401 c and 402 c of 5 are displayed on the
screen 400 c.
[0033]
FIG. 4 is a view for explaining a display example of “mixing adjustable GUI” in the audio
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mixing process according to the embodiment of the present invention. In this example, it is
possible to perform balance adjustment of relatively raising the volume of the main sound or
raising the volume of the sub sound by cursor operation (left button 300 b and right button 300
d) of the remote control 300 at hand of the user. .
[0034]
FIG. 5 is a view for explaining a display example for performing “main / sub individual
adjustment” in the audio mixing process according to the embodiment of the present invention.
In this example, it is possible to select the main sound with the cursor 300e and adjust the
volume of the main sound with the cursors 300c and 300d. In addition, it is possible to select the
sub audio with the cursor 300f and adjust the volume of the sub audio with the cursors 300c and
300d. Even with such a method, it is possible to adjust the mixing balance between the main
sound and the sub sound.
[0035]
When the user sets a plurality of mixing balance adjustment results, the plurality of mixing
coefficients obtained as a result are stored in the mixing coefficient memory 111a of FIG. 1, and
later (at any processing time after S100N of FIG. 2) It is also possible to configure the user to
select the desired mixing coefficient immediately (for example, directly select the desired mixing
coefficient with a number key (not shown) of the remote control 300).
[0036]
<Summary of apparatus configuration according to one embodiment>
It has a means for detecting that the audio stream is input to the main audio decoding unit 103
and being decoded; 3. A means for detecting that the audio stream is input to the sub audio
decoding unit 104 and being decoded; The main / sub audio mixing adjustment unit 111 has
means for determining that both main audio and sub audio are decoded using the means 1 and 2;
The main / sub audio mixing adjustment unit 111 has a means for displaying a message that
mixing of the main audio and the sub audio is possible when it is determined that both the main
audio and the sub audio are decoded; . The main / sub audio mixing adjustment unit 111 has a
means for selecting the start of mixing adjustment of the main audio and the sub audio when the
message is displayed at 4; 7. The main / sub audio mixing adjustment unit 111 has setting means
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for performing mixing adjustment of the main audio and sub audio after the start of mixing
adjustment of the main audio and sub audio is selected in 5; The main / sub audio mixing
adjustment unit 111 has means for storing the mixing coefficients of the main audio and the sub
audio set at 5; The main / sub audio mixing adjustment unit 111 has means for controlling the
audio mixing unit 108 based on the mixing coefficients of the main audio and the sub audio
stored in 6 and adjusting the mixing of the main audio and the sub audio.
[0037]
<Example of Correspondence Between Embodiment and Invention> (1) A method of customizing
audio mixing in which a main audio stream and a sub audio stream are decoded, and the decoded
main audio and sub audio are mixed and output. When both of the sub audio streams are being
decoded (S01Y), it is possible to adjust mixing of the main audio obtained by the decoding of the
main audio stream and the sub audio obtained by the decoding of the sub audio streams. Notify
(by image and / or voice) (S06Y). Then, when there is an operation to change the mixing balance
between the decoded main audio and the decoded sub audio (S 18 Y or S 20 Y), the mixing
coefficient is updated according to this operation, and the setting is performed according to the
updated mixing coefficient The decoded main audio and the decoded sub audio are output with
the mixing balance.
[0038]
(2) The notification is performed via a graphical user interface (FIGS. 3 to 5), and on this
graphical user interface, a notification screen display (FIG. 3) indicating that mixing adjustment
of the main sound and the sub sound is possible (FIG. 3 401a) is performed (S08), or a mixing
balance screen display (401b in FIG. 4) is performed (S10), which changes in accordance with the
mixing balance between the main sound and the sub sound (S10), or the main sound The main
audio screen display (401c in FIG. 5) which changes according to the size of the sub audio and
the sub audio screen display (402 c in FIG. 5) which changes the size corresponding to the sub
audio are performed (S10).
[0039]
(3) An audio stream processing apparatus (FIG. 1) that decodes the main audio stream and the
sub audio stream, mixes the decoded main audio and the sub audio, and outputs the mixed
signal, and the main audio decoding unit (103) decodes the main audio stream. The sub audio
decoding means (104) for decoding the sub audio stream, the main audio decoded by the main
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audio decoding means (103), and the sub audio decoded by the sub audio decoding means (104)
Detecting that the main audio stream and the sub audio stream are being decoded by both the
audio mixing means (108) for mixing, the main audio decoding means (103) and the sub audio
decoding means (104) Decoding state detection means (111 The decoding status detecting
means (S01), that the main audio stream and the sub audio stream are being decoded by both the
main audio decoding means (103) and the sub audio decoding means (104) 111) (S01Y), it is
notified that mixing adjustment between the main audio obtained by the decoding of the main
audio stream and the sub audio obtained by the decoding of the sub audio stream is possible
(image and / or audio Mixing adjustable notification means (firmware 115 of S115), the main
audio decoded by the main audio decoding means (103) and the sub audio decoded by the sub
audio decoding means (104) Mixing balun Main / Sub audio mixing adjusting means for
performing an operation of changing (111 firmware: S18~S21) and Bei a.
When there is an operation to change the mixing balance by the main / sub audio mixing
adjustment means (111) (S18Y or S20Y), this device updates the mixing coefficient according to
this operation and sets it according to the updated mixing coefficient The decoded main audio
and the decoded sub audio are provided from the audio mixing means (108) with the mixing
balance.
[0040]
(4) The audio stream processing apparatus (FIG. 1) can further include display control means
(firmware 116: S06 to S10) for providing a graphical user interface (FIGS. 3 to 5) for performing
the notification. With the video output controlled by the display control means, a notification
screen display (401a in FIG. 3) indicating that mixing adjustment of the main audio and the sub
audio is possible is performed (S08), or with the main audio A mixing balance screen display
(401b in FIG. 4) that changes according to the mixing balance with the sub audio is performed
(S10), or a main audio screen display that changes according to the size of the main audio (FIG.
5) 401c) and the sub audio screen display (402c in FIG. 5) which changes in accordance with the
size of the sub audio (S10).
[0041]
(5) The main audio stream and the sub audio stream can correspond to elementary streams
constituting an MPEG program stream. The audio stream processing apparatus (FIG. 1) includes a
disc drive (102) for reproducing an optical disc on which audio and video contents (HD_DVD
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contents) are recorded using the elementary stream, and the audio and video contents. Video
decoding means (106, 107) for decoding the stream of video data to be recorded, the video data
decoded by the video decoding means (106, 107), and an image corresponding to the notification
content by the mixing adjustable notification means (115) A video blending means (109) for
blending with data, and a video output means (112) for outputting the video data blended by the
video blending means (109) to the image display device (400) can further be provided. .
[0042]
According to an embodiment of the present invention, even in the case of content without
information for adjusting the mixing balance of the main audio and the sub audio, the mixing
balance of the main audio and the sub audio can be customized for each viewer (user) Thus, it is
possible to reproduce audio suitable for the viewer.
[0043]
The present invention is not limited to the above-described embodiment, and can be variously
modified in the implementation stage without departing from the scope of the invention.
In addition, the embodiments may be implemented in combination as appropriate as possible, in
which case the combined effect is obtained. Furthermore, the above embodiments include
inventions of various stages, and various inventions can be extracted by an appropriate
combination of a plurality of disclosed configuration requirements. For example, even if some of
the configuration requirements are removed from all the configuration requirements shown in
the embodiment, the problems described in the section of the problem to be solved by the
invention can be solved, and the effects described in the effects of the invention If is obtained, a
configuration from which this configuration requirement is deleted can be extracted as the
invention.
[0044]
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram for explaining a playback device
according to an embodiment of the present invention. A figure explaining an audio mixing
processing procedure concerning a 1 embodiment of this invention. FIG. 8 is a view for
explaining a display example of “mixing adjustable message” in the audio mixing process
according to the embodiment of the present invention. FIG. 7 is a view for explaining a display
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example of “mixing adjustable GUI” in the audio mixing process according to the embodiment
of the present invention. A figure explaining an example of a display which performs "individual
adjustment of main / sub" in sound mixing processing concerning a 1 embodiment of this
invention. FIG. 7 is a view for explaining an example of the data structure of a disc reproduced by
the reproducing apparatus of FIG. 1;
Explanation of sign
[0045]
1: Information recording medium (optical disc such as HD DVD video) 102: disc drive / data
input unit 103: main audio decoding unit 104: sub audio decoding unit 105: HD DVD control unit
(MPU) 105a: system parameter memory 106 106 main video decoding unit 107 sub video
decoding unit 108 audio mixing unit 109 video blending unit 110 audio output unit 111 main /
sub audio mixing adjustment unit (MPU) 111 a mixing coefficient Memory 112: video output unit
116: GUI display control unit (OSD unit) / voice synthesis unit 200: speaker 300: remote control
400: image display device (monitor TV).
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