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JP2005244846

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2005244846
PROBLEM TO BE SOLVED: To reproduce surround sound by effectively utilizing a portable device
having an audio reproduction function. SOLUTION: When the system main body 21 and the
portable part 10 are connected, the image display part 11 of the portable part 10 is used for
displaying the image of the DVD reproduced on the system main body 21 side, and the portable
part 10 is The speaker unit 12 is used as a center speaker for surround sound output of DVD.
Further, when the portable unit 10 is separated from the system main body 21, the image display
unit 11 and the speaker unit 12 of the portable unit 10 can be connected to the video / audio
signal source 17 provided inside the portable unit 10. Used for output of image and audio
signals. The connection between the system main body 21 and the portable unit 10 is made by
detecting whether the portable unit 10 is attached to the cradle 22 or not. [Selected figure]
Figure 2
Audio reproduction system, surround sound generator, portable equipment
[0001]
The present invention relates to an audio reproduction system and the like that reproduces
surround sound using a plurality of speakers, and more particularly to an audio reproduction
system and the like in which a part of the audio reproduction system is configured by portable
equipment.
[0002]
Conventionally, in a movie theater, a multi-channel surround sound reproducing apparatus has
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been introduced, and a surround sound with a sense of reality is reproduced together with an
image shown on a large screen.
In recent years, devices for enjoying surround sound similar to movie theaters in homes and cars
have been put into practical use and introduced.
[0003]
In order to reproduce such surround sound, a source of surround sound and a reproduction
device for reproducing the source are required. Here, examples of the source include video disks
such as DVD (Digital Versatile Disk) -VIDEO, video tapes such as D-VHS (Data VHS), cable
systems, satellite broadcasting, digital television broadcasting, and the like. Also, as a
reproduction apparatus, for example, a 5.1 ch surround system is common. This 5.1 ch system is
composed of a center amplifier device for reproducing the source and six speaker devices. Here,
the speaker device includes speakers disposed at the front left and right (left and right) and rear
left and right (rear left and rear light), a speaker disposed at the front center (center), and a
subwoofer for reproducing deep bass. It consists of the speaker for. Then, at a position facing the
center speaker, the user listens to the surround sound in a state of being surrounded by the
respective speakers. Further, for example, in the case of reproducing the above-described DVDVIDEO, a display device is provided in the vicinity of the center speaker, and the user listens to
the audio reproduced from each speaker while watching the video displayed on the display
device. Become.
[0004]
It is common for the display device to be provided with a speaker unit. Therefore, it has been
considered to use a speaker unit provided in a color television as a center speaker for surround
sound reproduction. Conventionally, for example, a left, right, rear left, rear light speaker device
and a speaker unit provided in a color television are connected to a center amplifier device, and
when there is an input from the center amplifier device, the speaker unit There is disclosed a
technique of outputting sound and outputting television sound to a speaker unit in the case of
normal television broadcast reception without input from a center amplifier device (see Patent
Document 1).
[0005]
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JP-A-2000-69379 (page 3-4, FIG. 2)
[0006]
Recently, portable image display devices such as PDAs (Personal Digital Assistants) and small
color televisions have been widely used.
Also, portable audio playback devices such as portable radios have been widely used
conventionally. Therefore, it is conceivable to use a small portable device having such an audio
reproduction function by incorporating it into the above-described surround system.
[0007]
However, in the related art, when incorporating the portable device into the surround system, it
is troublesome because the user has to make settings for the surround system on the portable
device. To address this problem, the technology described in Patent Document 1 basically
assumes that a display device such as a large television is fixedly installed in, for example, a
living room or the like, so the environment in which the display device is installed is There has
been no consideration in dealing with changes.
[0008]
In addition, such a problem is not limited to the 5.1ch system described above, but a 6.1ch
system in which a speaker at the rear center (rear center) is further added to the 5.1ch system,
and a left side (left The same may occur in a 7.1 channel system or the like in which side
speakers and right side (light side) speakers are added.
[0009]
The present invention has been made to solve such technical problems, and an object of the
present invention is to reproduce surround sound by effectively utilizing a portable device having
an audio reproduction function.
[0010]
To this end, an audio reproduction system to which the present invention is applied includes a
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signal source for generating an audio signal and a speaker unit, and a portable unit capable of
independently reproducing audio and a portable unit are detachably provided. And a surround
sound generation unit for generating multi-channel surround sound, and the portable unit
outputs a plurality of surround speakers for generating surround sound generated by the
surround sound generation unit in a state of connection to the cradle. As one of them, the
speaker unit is made to function.
[0011]
Here, the speaker unit is configured of a plurality of speakers, and outputs monaural sound of
surround sound generated by the surround sound generation unit in the connection state to the
cradle, and generates sound in the signal source in the non connection state to the cradle Can be
characterized as stereo output.
The portable unit further includes an image display unit, and the signal source generates an
image signal in addition to the audio signal, and generates an image corresponding to the multichannel surround sound generated by the surround sound generation unit. The image display
unit is characterized by displaying the image generated by the image generation unit in the
connection state to the cradle, and displaying the image generated by the signal source in the
disconnection state to the cradle. be able to.
Furthermore, the speaker unit may be characterized in that it outputs the center sound in the
surround sound generated by the surround sound generation unit in a state of connection to the
cradle.
Furthermore, the portable part can be characterized as being a portable information terminal
device.
[0012]
Further, from another viewpoint, the surround sound generation apparatus to which the present
invention is applied is a surround sound generation apparatus for generating multi-channel
surround sound, and is a speaker unit for a specific portion constituting a multi-channel speaker.
The installation state of the provided portable device is detected by the detection means, and
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based on the detection result by the detection means, the voice generation means includes an
output sound to the speaker unit when the portable device is installed at a specific location A
first surround sound signal is generated, and a second surround sound signal not including an
output sound to the speaker unit is generated when the portable device is not installed at a
specific location. Here, when generating the first surround sound signal, the sound generation
means may be characterized in that a center sound signal to be output to the speaker unit is
generated.
[0013]
Further, from the other point of view, the portable device to which the present invention is
applied includes an audio signal source generating an audio signal, a speaker unit capable of
outputting audio generated by the audio signal source, and a multi-channel speaker And a
switching unit that switches the speaker unit to function as one of the speakers for multi-channel
surround sound reproduction based on the detection result of detecting the installation state at a
specific location constituting the sensor and the detection result by the detection unit And
contains. Here, the detection unit may be characterized by detecting a connection to an audio
output device that outputs multi-channel surround sound.
[0014]
Furthermore, from the other point of view, the portable device to which the present invention is
applied is a video / audio signal source that generates a video signal and an audio signal, and a
display capable of displaying a video generated by the video / audio signal source. , A speaker
unit for outputting the audio generated by the video and audio signal source, a detection unit for
detecting the installation state at a specific location constituting the multi-channel speaker, and a
speaker based on the detection result by the detection unit The unit functions as one of the
speakers for multi-channel surround sound reproduction and includes a switching unit for
switching the display unit to display an image corresponding to the multi-channel surround
sound.
[0015]
According to the present invention, surround sound can be reproduced by effectively utilizing a
portable device having an audio reproduction function.
[0016]
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Hereinafter, the best mode for carrying out the present invention (hereinafter referred to as an
embodiment) will be described in detail with reference to the attached drawings.
FIG. 1 shows a car AV apparatus as an audio reproduction apparatus to which the present
embodiment is applied.
In the present embodiment, the automobile 20 is provided on the system main body 21 provided
at the center of the instrument panel between the driver's seat and the passenger's seat, on the
upper part of the system main body 21 and equipped with the portable part 10 described later. ,
A left front speaker 23 mounted on the left side of the front passenger seat, a light front speaker
24 mounted on the right side of the driver seat, a left rear speaker 25 mounted on the rear seat
left side, and A light rear speaker 26 and a subwoofer 27 mounted at the rear right of the rear
seat are provided. In this example, the subwoofer 27 is mounted at the rear right of the rear seat,
but since the bass component has no directivity, it may be mounted anywhere in the vehicle.
[0017]
In addition, the portable unit 10 includes, for example, an image display unit (display unit) 11
configured by a liquid crystal display device or the like, speaker units 12 provided on both left
and right sides of the image display unit 11, and an operation input unit that receives
instructions from a user. It is equipped with thirteen. なお、スピーカユニット12は、レフトス
ピーカ12aとライトスピーカ12bとからなる。 The portable unit 10 is configured to be
detachable from the cradle 22 provided in the automobile 20. When mounted on the cradle 22,
the portable unit 10 is controlled from the side of the system main body 21 and the center at the
time of display and surround reproduction It functions as a speaker, and when removed from the
cradle 22, it functions as a personal digital assistant (PDA) alone.
[0018]
FIG. 2 shows a block diagram of a portable unit 10 as one of the portable devices described
above and a system main body 21 as one of the audio output devices. The portable unit 10
includes a rechargeable battery 14 a in addition to the image display unit 11, the speaker unit
12, and the operation input unit 13 described above, and a power supply unit 14 for supplying
power to the portable unit 10. Control unit 16 for controlling the entire portable unit 10 based
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on an instruction received from the operation detection unit 13 or the system main unit 21, such
as a TV tuner, etc. The video display unit 11 is controlled by the audio / video signal source 17
as an audio signal source or an audio / video signal source serving as a video / audio signal
source and the control unit 16 based on the connection detection result by the connection
detection unit 15. And a switching unit 18 for switching the input system to the speaker unit 12,
and power transmission and data communication with the system main body 21 when mounted
on the cradle 22. It includes interface for the (not shown). The cradle 22 is provided with an
interface unit 22a for performing power supply and data communication from the system main
body 21 to the portable unit 10 when the portable unit 10 is attached.
[0019]
Here, the image signal from the video / audio signal source 17 is output to the image display unit
11, and the stereo audio signal from the video / audio signal source 17 is directed to the left
speaker 12a for the left channel, The channels are respectively outputted toward the light
speakers 12b. In addition to the speaker unit 12, the stereo audio signal from the video / audio
signal source 17 is also output to the interface unit 19. Then, when the portable unit 10 is
connected to the cradle 22, the stereo audio signal output toward the interface unit 19 is input to
an audio signal processing unit 36 (described later) provided in the system main body 21. It has
become so. As the video / audio signal source 17 provided in the portable unit 10, in addition to
the above-described TV tuner, for example, a radio tuner, a reproduction unit of video and audio
recorded in a disk medium, a semiconductor memory card, etc. can be considered. . The
rechargeable battery 14 a of the power supply unit 14 provided in the portable unit 10 is used as
a power supply when the portable unit 10 is made to function alone as a PDA, and the portable
unit 10 is via the cradle 22. When it is connected to the system main body 21, it is charged by a
power supply unit 31 (described later) provided in the system main body 21.
[0020]
On the other hand, the system main unit 21 supplies power from the battery (not shown) of the
automobile 20 to the system main unit 21 and the portable unit 10 mounted on the cradle 22.
The operation input unit 32 for receiving, the connection detection unit 33 as a detection means
for detecting the connection (attachment) of the portable unit 10 to the cradle 22, the DVD / CD
drive 34 for reproducing DVD-Video and CD (Compact Disc), DVD / CD Image signal processing
unit 35 processing an image signal output from the CD drive 34, audio signal processing unit 36
processing an audio signal output from the portable unit 10 via the DVD / CD drive 34 and the
interface unit 22a, operation The control unit 37 controls the entire system main body 21 and
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the portable unit 10 based on an instruction received by the input unit 32. Further, in the present
embodiment, when the portable unit 10 is connected to the cradle 22, control communication is
performed between the control unit 16 provided in the portable unit 10 and the control unit 37
provided in the system main body 21. Is supposed to be done. In the present embodiment, the
DVD / CD drive 34 and the audio signal processing unit 36 function as one of a surround sound
generation unit or an audio generation unit, and the DVD / CD drive 34 and the image signal
processing unit 35 are ones of the image generation unit. Function as one.
[0021]
Here, the DVD / CD drive 34 can play DVDs compatible with the 5.1 ch surround system, and the
audio signal processing unit 36 outputs the 5.1 ch surround output from the DVD / CD drive 34.
In the case of a corresponding audio signal, a predetermined decoding process can be performed
on the input audio signal. Then, the left front audio signal of the multi-channel audio signal
decoded in accordance with the 5.1 ch surround system is directed to the left front speaker 23,
and the right front audio signal is directed to the light front speaker 24 so as to be a left stereo
audio signal. The signal is output to the left stereo speaker 25, the right rear audio signal to the
right rear speaker 26, the deep bass audio signal to the subwoofer 27, and the center audio
signal to the interface unit 22a. When the portable unit 10 is connected to the cradle 22, the
center audio signal output toward the interface unit 22a is sent to the speaker unit 12 provided
in the portable unit 10. The center audio signal is a monaural audio signal, and in the present
embodiment, the same audio signal is input to the left speaker 12a and the light speaker 12b
that constitute the speaker unit 12. In this case, The speaker unit 12 functions as a monaural
speaker.
[0022]
In the present embodiment, as described above, the portable unit 10 can be attached to and
detached from the cradle 22 provided in the automobile 20, and the portable unit 10 is attached
to the cradle 22, and the cradle The operation mode is made to differ depending on when the
portable unit 10 is removed from the unit 22.
[0023]
Next, operation mode switching (operation mode switching to the connection operation mode)
when the portable unit 10 is attached to the cradle 22 will be described in detail.
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FIG. 3A is a flowchart for explaining the flow of the connection operation mode switching process
in the portable unit 10. When the connection detecting unit 15 of the portable unit 10 detects
that the portable unit 10 is connected to the cradle 22 (step 101), the control unit 16 of the
portable unit 10 connects the portable unit 10 It switches to the operation mode (step 102). The
control unit 16 controls the switching unit 18 to switch the image input to the image display unit
11 to the input from the system main unit 21 and the sound input to the speaker unit 12 as the
system unit. Switch to the input from 21. Then, the switching to the connection operation mode
is ended (step 103). On the other hand, FIG. 3B is a flowchart for explaining the flow of the
connection operation mode switching process in the system main body 21. When connection
detector 33 of system main body 21 detects that portable unit 10 is connected to cradle 22 (step
201), control part 37 of system main body 21 places system main body 21 in the connection
operation mode. Switch (step 202). The control unit 37 controls the audio signal processing unit
36 to release the mute of the center audio signal output from the audio signal processing unit 36
to the interface unit 22 a, The audio output (first surround audio signal) according to the 1ch
surround system is made executable. Then, the switching to the connection operation mode is
ended (step 203).
[0024]
By performing such switching control, in the connection operation mode, in addition to the left
front speaker 23, the light front speaker 24, the reflector speaker 25, the light rear speaker 26,
and the subwoofer 27 originally installed in the automobile 20, The speaker unit 12 provided in
the carrying unit 10 can be used as a center speaker. That is, these speakers function as
surround speakers. Further, the image display unit 11 provided in the portable unit 10 can also
be used as a monitor of the system main body 21. Therefore, for example, in the case where a
DVD (for example, a movie or the like is recorded) compatible with the 5.1 ch surround system is
reproduced by the DVD / CD drive 34 provided in the system main body 21, the system main
body 21 is provided. The video image-processed by the selected image signal processing unit 35
is displayed on the image display unit 11 provided in the portable unit 10, and the audio signal
processing unit 36 provided in the system main body 21 decodes 5 The surround sound signal of
the 1ch surround sound is outputted in 5.1ch by the left front speaker 23, the light front speaker
24, the left rear speaker 25, the light rear speaker 26, the subwoofer 27 and the speaker unit 12
provided in the portable unit 10. . As a result, viewers such as drivers can enjoy video and audio
with a sense of presence. Further, in the present embodiment, since the speaker unit 12 provided
in the portable unit 10 including the image display unit 11 is used as a center speaker for
surround sound output, a situation may occur where the localization of the center sound
deviates. Absent.
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[0025]
Next, operation mode switching (operation mode switching to the separation operation mode)
when the portable unit 10 is removed from the cradle 22 will be described in detail. FIG. 4A is a
flowchart for explaining the flow of the separation operation mode switching process in the
portable unit 10. When the connection detecting unit 15 of the portable unit 10 detects that the
portable unit 10 is separated from the cradle 22 (step 301), the control unit 16 of the portable
unit 10 operates the portable unit 10 in the separation operation mode. Switch to (step 302). The
control unit 16 controls the switching unit 18 to switch the image input to the image display unit
11 to the input from the video / audio signal source 17 provided in the portable unit 10. The
audio input to the speaker unit 12 is also switched to the input from the video / audio signal
source 17. Then, the switching to the separation operation mode is ended (step 303). FIG. 4B is a
flowchart for explaining the flow of the separation operation mode switching process in the
system main body 21. When the connection detection unit 33 of the system main body 21
detects that the portable unit 10 is separated from the cradle 22 (step 401), the control unit 37
of the system main body 21 switches the system main body 21 to the separation operation mode
Step 402). The control unit 37 controls the audio signal processing unit 36 to mute the center
audio signal output from the audio signal processing unit 36 to the interface unit 22a, and the
5.1 channel surround operation is performed. In addition to making the audio output by the
system inoperable, another audio output (second surround audio) that can be reproduced in
surround with other speakers of 4.1 channels without using the center speaker Make it Then, the
switching to the separation operation mode is ended (step 403).
[0026]
By performing such switching control, the following can be performed after execution of the
separation operation mode. First, in the car 20, the left main speaker 23, the light front speaker
24, the light stereo speaker 25, the light rear speaker 26, and the subwoofer 27 originally
installed in the car 20 are used by the system main body 21 4.1 ch. Surround playback will be
possible. That is, each speaker except the speaker unit 12 provided in the portable unit 10
functions as a surround speaker. At that time, the 4.1ch surround sound signal decoded
differently from the 5.1ch surround sound signal in the connection operation mode is output to
each speaker, and the listener can listen to the surround sound without discomfort. . On the other
hand, the portable unit 10 can also be taken out of the vehicle, for example, and displays an
image output from the video / audio signal source 17 on the image display unit 11 at a favorite
place and The output sound can be output from the speaker unit 12. And in this case, since it
becomes possible to output independent voices respectively to the left speaker 12 a and the light
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speaker 12 b which constitute the speaker unit 12, the portable unit 10 can enjoy 2ch stereo
voice.
[0027]
As described above, in the present embodiment, when the system main body 21 and the portable
unit 10 are connected, the image display unit 11 of the portable unit 10 is used for image display
of a DVD, and the speaker unit 12 of the portable unit Can be used as a center speaker for DVD
surround sound output. When the portable unit 10 is separated from the system main body 21,
the image display unit 11 and the speaker unit 12 of the portable unit 10 are used to output the
image signal and the audio signal from the video / audio signal source 17. be able to. When the
portable unit 10 is used alone, it is possible to output stereo 2-ch audio using the left speaker 12
a and the light speaker 12 b that constitute the speaker unit 12. This enables the user to enjoy
realistic surround sound and images by the system main body 21 and the portable unit 10 in the
car, and it is possible in the state of carrying the portable unit 10 (for example, outside the
vehicle) The carrying unit 10 makes it possible to enjoy sounds and images freely.
[0028]
In the present embodiment, an example in which the system main body 21 has only a function
for reproducing a DVD-Video or a CD has been described. However, the present invention is not
limited to this. It can also be configured to further include a navigation function to be performed
and a radio reception function. In addition, application to a video game apparatus using a DVD or
a CD as a medium is also conceivable. Further, in the present embodiment, the connection
detection unit 15 is provided in the portable unit 10, and the connection detection unit 33 is
provided in the system main body 21 to detect the connection of the portable unit 10. The cradle
22 is not limited to this, for example, by detecting whether control communication between the
control unit 16 provided in the portable unit 10 and the control unit 37 provided in the system
main body 21 can be performed. The attachment of the portable unit 10 to the head may be
detected. Furthermore, in the present embodiment, although 5.1 channel surround reproduction
can be performed by the system main body 21, the present invention is not limited to this, and
an apparatus capable of 6.1 channel surround reproduction and 7.1 channel surround
reproduction It is also possible to apply. Furthermore, in the present embodiment, an example in
which the portable unit 10 has a function as a PDA has been described. However, the present
invention is not limited to this. For example, a portable radio may not have the image display unit
11.
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[0029]
And although application to a car-mounted AV apparatus provided in car 20 was explained in
this embodiment, it is not restricted to this, for example, application to an AV apparatus used
indoors may also be possible. In this case, as the portable unit 10, for example, a display device
that has a wireless LAN function and is detachably provided to a base station corresponding to
the cradle 22 can be considered. Then, as described in the present embodiment, an image or
display displayed on the display device when the display device is attached to the base station
and when the display device is removed from the base station If the signal source of the sound
output from the speaker unit provided in the device is switched, the same effect as that of the
present embodiment can be obtained.
[0030]
It is a figure for demonstrating the outline | summary of the vehicle-mounted AV apparatus
which concerns on one Embodiment. It is a block diagram of a portable part and a system main
part. (a) is a flowchart in a portable part, (b) is a flowchart for demonstrating the flow of the
connection operation mode switching process in a system main body. (a) is a flowchart in a
portable part, (b) is a flowchart for demonstrating the flow of the isolation | separation operation
mode switching process in a system main body.
Explanation of sign
[0031]
DESCRIPTION OF SYMBOLS 10 ... Portable part, 11 ... Image display part, 12 ... Speaker unit, 12a
... Left speaker, 12b ... Light speaker, 13 ... Operation input part, 14 ... Power supply part, 14a ...
Rechargeable battery, 15 ... Connection detection part, 16 ... control unit, 17 ... video / audio
signal source, 18 ... switching unit, 20 ... car, 21 ... system body, 22 ... cradle, 22a ... interface unit,
23 ... left front speaker, 24 ... right front speaker, 25 ... left Rear speaker 26 light rear speaker 27
subwoofer 31 power source 32 operation input unit 33 connection detector 34 DVD / CD drive
35 image signal processor 36 audio signal processor , 37 ... control unit
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