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DESCRIPTION JP2013062580

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DESCRIPTION JP2013062580
Abstract: A user having a portable music playback device does not need to perform an on
operation and an off operation of a power switch of the audio playback device, and operability
can be improved. A wireless communication unit that receives an audio signal by wireless
communication and outputs the audio signal, an audio reproduction unit including a speaker that
reproduces the audio signal, and a first power supply to the audio reproduction unit is turned on
or off. And a control unit that controls the When the control unit receives a connection
notification from the wireless communication unit in a standby state where the supply of the
second power to the wireless communication unit and the control unit is on, the supply of the
first power is turned on, and the audio signal from the communication unit is output. When the
control unit receives a disconnection notification from the wireless communication unit, the
control unit turns off the supply of the first power to stop the reproduction of the audio signal
from the communication unit. [Selected figure] Figure 2
Sound reproduction apparatus and sound reproduction method
[0001]
The present disclosure relates to an audio reproduction apparatus and an audio reproduction
method that are connected by wireless communication with a portable music reproduction
apparatus such as a digital audio player and reproduces an audio signal reproduced by the
portable music reproduction apparatus.
[0002]
11-04-2019
1
Conventionally, as portable music reproduction devices such as digital audio players, smart
phones, portable personal computers, etc., those having a wireless communication function such
as Bluetooth (registered trademark) have been commercialized.
There are known a configuration in which a wireless module for Bluetooth is incorporated in an
electronic device, and a configuration in which the wireless module is freely attachable as an
adapter. In the outdoors, for example, the playback music of the portable music player can be
listened to by the wireless headset. Then, in the house, the reproduction music of the portable
music reproduction device can be listened to by the sound reproduction device (so-called
wireless speaker system).
[0003]
When playing back an audio signal from the portable music player by the audio player, it is
necessary to turn on the power of the audio player and set the input selector to select the
portable music player (Bluetooth device). there were. As described above, there is a problem that
the convenience of the wireless communication is impaired by going to the location of the sound
reproduction apparatus and operating the switch of the system. Furthermore, always turning on
the power of the sound reproducing apparatus has a problem of causing unnecessary power
consumption.
[0004]
Patent Document 1 describes that voice output is performed from the stationary apparatus
without placing the portable terminal on the stationary apparatus. According to Patent Document
2, even if the portable audio device is moved to the room, in the car, etc. during music
reproduction, the indoor audio device or the on-vehicle audio device can be continuously
operated without replacing the recording medium. It is described that the same music is played
at.
[0005]
JP, 2005-310287, A JP, 2002-300060, A
[0006]
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2
In patent document 1, it is the structure which provides the communication path of an optical
remote control signal, and the radio | wireless (radio wave) communication path for transmitting
an audio signal between a portable terminal and a stationary apparatus.
Then, in the mobile terminal, when the remote switch is pressed, a mode in which sound is
output from the headphones connected to the mobile terminal and a remote mode in which
sound is output from the stationary apparatus are determined. In the remote mode, a signal for
turning on the power of the stationary apparatus is transmitted from the portable terminal to the
stationary apparatus via the optical communication path.
[0007]
In the case of Patent Document 1, it is necessary to operate both the mode switch and the remote
switch in the portable terminal in order to turn on the stationary apparatus and to play music by
the stationary apparatus. Furthermore, the user needs to know the meaning of the operation of
the remote switch. From these points, there is a problem that the operability is not good.
[0008]
Patent Document 2 discloses that the power to the data receiving apparatus is turned on to play
music by the data receiving apparatus. However, Patent Document 2 does not disclose that the
power of the data receiving apparatus is turned off when the reproduction of music by the data
receiving apparatus is completed. When the power switch of the data receiving apparatus is
operated to turn off the power of the data receiving apparatus, as described above, it is necessary
to go to the data receiving apparatus at a remote place, which is convenient for wireless
communication. There was a problem of losing sex.
[0009]
Therefore, the present disclosure aims to provide a sound reproducing device having good
operability without the need for the user having the portable music reproducing device to
perform the on operation and the off operation of the power switch.
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[0010]
In order to solve the problems described above, the present disclosure relates to a wireless
communication unit that receives an audio signal by wireless communication and outputs the
audio signal, an audio reproduction unit including a speaker that reproduces the audio signal,
and When the control unit receives a connection notification from the wireless communication
unit in a standby state in which the control unit controls on / off of the power supply of 1 and
the second power supply to the wireless communication unit and the control unit is on. The first
power supply is turned on, the audio signal from the communication unit is reproduced by the
audio reproduction unit, and when the control unit receives a disconnection notification from the
wireless communication unit, the first power supply is turned off and the communication unit is
turned off. The audio reproduction apparatus is capable of stopping reproduction of the audio
signal of
[0011]
The present disclosure receives an audio signal by wireless communication of the wireless
communication unit, outputs an audio signal, reproduces the audio signal by the audio
reproduction unit, and turns on the supply of the first power to the audio reproduction unit by
the control unit. , The off control, the second power supply to the wireless communication unit
and the control unit is in the on standby state, and when the control unit receives a connection
notification from the wireless communication unit, the first power supply is turned on to perform
communication. The audio signal from the unit is reproduced by the audio reproduction unit, and
when the control unit receives the disconnection notification from the wireless communication
unit, the supply of the first power is turned off to enable the reproduction of the audio signal
from the communication unit to be stopped. It is a sound reproduction method.
[0012]
In the present disclosure, when the audio signal reproduced by the portable music reproducing
device at hand is reproduced by the sound reproducing device at a remote place, the power is
turned on or off without operating the power switch of the sound reproducing device. Can be
controlled.
[0013]
It is a perspective view showing the appearance of the sound reproduction device by this
indication.
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4
FIG. 1 is a block diagram of an embodiment of a sound reproduction device according to the
present disclosure.
It is a flowchart used for operation | movement description of one Embodiment of the sound
reproduction apparatus by this indication.
It is a flowchart used for operation | movement description of one Embodiment of the sound
reproduction apparatus by this indication.
[0014]
The embodiments described below are preferable specific examples of the present disclosure,
and various technically preferable limitations are attached. However, the scope of the present
disclosure is particularly described in the following description. It is not limited to these
embodiments as long as there is no.
[0015]
"One Example of Sound Reproduction Device" An embodiment of the present disclosure will be
described.
An example of a sound reproduction apparatus to which the present disclosure can be applied
will be described with reference to FIG.
The sound reproduction apparatus 100 is provided with a speaker 101L for the left channel and
a speaker 101R for the right channel in a housing. The present disclosure can also be applied to
a configuration in which the speaker is separated and connected to the speaker and the power
amplifier by the speaker cable.
[0016]
An operation switch is provided on the top surface of the housing. Reference numeral 102
denotes a power switch, and three states of power on, off, and standby (so-called standby) can be
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5
switched by the power switch 102. Reference numeral 103 denotes a power supply lamp for
displaying the state of the power supply. As described later, the first power on / off of the audio
reproduction unit and the second power on / off of the Bluetooth module as the wireless
communication unit and the control unit (CPU) can be independently controlled. It is done.
[0017]
When the power switch 102 is in the on position, both the first and second power supplies are
on. When the power switch 102 is in the off position, both the first and second power supplies
are off. When the power switch 102 is in the standby position, the supply of the first power is
turned off and the supply of the second power is turned on. Therefore, in this standby state, the
Bluetooth module is in the standby state, and the control unit is in the standby process.
[0018]
Reference numeral 104 denotes a line input selection button, and reference numeral 105
denotes a line input lamp for displaying a line input selection state. The connection terminal for
line input is provided on the back of the housing. The recess 106 is a mounting unit (dock) to
which the portable music player 110 is attached and detached. The bottom surface of the
mounting recess 106 is provided with a plug (not shown) constituting a connection port.
[0019]
The portable music player 110 has operation buttons, a liquid crystal display unit, and the like,
can record music data on a storage medium such as a memory card, a hard disk, and a built-in
memory, and can play music data from the storage medium. The sound reproducing apparatus
100 and the portable music reproducing apparatus 110 can be connected by a port and
wirelessly connected by Bluetooth. 107a is a volume increase button, and 107b is a volume
decrease button.
[0020]
The electrical configuration of the sound reproducing apparatus 100 will be described with
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reference to FIG. An audio signal is supplied from the audio reproduction unit 11 to the speakers
101L and 101R. The audio reproduction unit 11 is formed by sequentially connecting a
preamplifier 12, a selector, a volume control unit 13, and a power amplifier 14. Power as a first
power source is supplied to the preamplifier 12, the selector and volume controller 13 and the
power amplifier 14 of the audio reproduction unit 11 via the switch 25.
[0021]
An audio signal output from the communication module 16 is input to the audio reproduction
unit 11. The communication module 16 is an IC circuit for performing Bluetooth communication.
For example, a wireless communication signal from a portable music playback device is received
by the antenna 17 and subjected to processing such as demodulation in the communication
module 16 to generate an audio signal. An audio signal from the line input terminal 15 is
supplied to the selector and volume controller 13. The selector and volume control unit 13
selectively reproduces one of the audio signal from the communication module 16 and the line
input audio signal from the input terminal 15 by the operation of the line input selection button
104.
[0022]
The control unit 21 is a microcomputer including a central processing unit (CPU), a random
access memory (RAM), a read only memory (ROM), and a clock circuit, and controls each unit of
the sound reproducing apparatus according to the embodiment. Do. For example, the control unit
21 generates control signals for the selector and volume control unit 13, the communication
module 16, the switch 25, and the power supply circuit 26. The control unit 21 is supplied with
the outputs of the various keys 22 and the power switch 102 described above, and a drive signal
for the light emitting diode (LED) 23 such as the power lamp 103 is supplied from the control
unit 21.
[0023]
An input DC power source generated from a commercial power source is supplied to the DC
input terminal 24. The input DC power source as the first power source is supplied to the
preamplifier 12, the selector and the volume controller 13 and the power amplifier 14 of the
audio reproduction unit 11 through the switch 25 in the on state. Furthermore, a second power
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supply generated by the power supply circuit 26 from the input DC power supply is supplied to
the control unit 21. When the power switch 102 is in the power on and standby positions, the
power from the power circuit 26 is supplied. The power supplied to the control unit 21 may be
different between the power on and the standby to save power.
[0024]
The control unit 21 and the communication module 16 are bi-directionally connected, and
information indicating the communication state from the communication module 16 is supplied
to the control unit 21. The control unit 21 outputs a power control signal according to the state
of the power switch 102. A power control signal is supplied to the switch 25 and the power
circuit 26. In the power-off state, the switch 25 is turned off, and the power supply to the audio
reproduction unit 11 is turned off.
[0025]
In the power-on state, the switch 25 is turned on, and the power supply to the audio
reproduction unit 11 is turned on. Further, DC power from the power supply circuit 26 is
supplied to the control unit 21. In the power supply standby state, the switch 25 is turned off,
and the power from the power supply circuit 26 is supplied to the control unit 21. In the standby
state, since the power supply to the audio reproduction unit 11 is turned off, the power
consumption can be reduced compared to the power on state. Furthermore, in the power-off
state, power supply to both the audio reproduction unit 11 and the control unit 21 is turned off.
Furthermore, the control unit 21 generates a control signal for each unit of the sound
reproduction apparatus.
[0026]
Note that a function of a tuner for receiving a radio broadcast, a CD reproduction function for
reproducing a CD, and the like may be added to the sound reproduction device in the present
disclosure.
[0027]
"About Bluetooth communication" Bluetooth performs relatively low-speed wireless
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communication such as character information and voice information between portable electronic
devices by spread spectrum technology using 2.4 GHz band radio waves (ISM band) It is used for
the purpose.
Bluetooth divides radio wave band of 2.4 GHz band into 79 frequency channels, performs
frequency hopping to change the frequency to be used at random, and between Bluetoothequipped devices in a short distance (approximately 10 to 100 m in radius), It performs wireless
communication of up to 24 Mbps.
[0028]
In one embodiment, communication is performed between a portable terminal equipped with
Bluetooth, such as a portable music player and a sound reproducing device, and a reproduced
audio signal of the portable music reproducer is reproduced by the sound reproducing device.
Since Bluetooth is used for communication of various devices, a protocol is formulated for each
type of device. More specifically, both the portable music playback device and the audio playback
device are adapted to be compatible with both A2DP (Advanced Audio Distribution Profile) and
AVRCP (Audio / Video Remote Control Profile).
[0029]
A2DP is a profile for transmitting audio to headphones (or earphones) with a receiver, and unlike
HSP (Headset Profile) / HFP (Hands-Free Profile), it enables transmission in stereo audio and
enables high-quality audio Reproduction is possible. AVRCP is a protocol for realizing a remote
control function of an AV device. AVRCP can be used to control the volume of the sound
reproduction device with a portable music reproduction device.
[0030]
In order to perform wireless communication by Bluetooth (hereinafter referred to as Bluetooth
communication as appropriate), it is necessary to pair the portable music playback device with
the sound playback device first. By pairing, both devices can recognize the other device and
register information of the other device in the non-volatile memory. Normally, you should do
pairing once.
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9
[0031]
The pairing procedure is performed as follows. The portable music player and the sound player
are placed at a distance of 1 m or less. The sound reproducing apparatus is in the pairing mode.
Select the Bluetooth pairing menu by operating the menu on the portable music playback device.
A list of devices that can be paired is displayed on the display unit. Select a sound reproduction
device in the list and decide the selection. When the input of the bus key is required, the bus key
(number) is input and determined. As a result, the bus key is exchanged with the sound
reproducing apparatus, and pairing is completed.
[0032]
When pairing is completed, the portable music player and the sound player can be in Bluetooth
communication. In order to reproduce the music reproduced by the portable music reproduction
apparatus by the sound reproduction apparatus, the Bluetooth connection is made, and the
portable music reproduction apparatus starts the reproduction of music. Bluetooth connection is
a state in which the portable music playback device and the sound playback device recognize
each other, and communication can actually be performed in the Bluetooth connection status.
The status of Bluetooth communication is displayed by the Bluetooth button. The sound
reproducing apparatus is also provided with a lamp (for example, also used as a power lamp) for
displaying the communication state.
[0033]
Conventionally, for Bluetooth connection, it is necessary to put the power switch of the sound
reproducing device in the on state (that is, waiting for Bluetooth connection) in advance, and it is
necessary to go to the sound reproducing device at a distant place. Convenience has been lost. In
the present disclosure, by setting the sound reproduction device in the standby state, the
operation of the power switch is not necessary. The standby state is also in a state of waiting for
Bluetooth connection, but power consumption can be reduced compared to the state of power
on.
[0034]
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10
In order to perform Bluetooth connection by the operation of the portable music playback
apparatus, for example, two operation methods are prepared. The first method is to select a
Bluetooth mode by operating the menu of the portable music player, select a sound player from a
list of Bluetooth devices, and decide the selection. The second method is a method of setting a
sound reproducing device as a Bluetooth device to be preferentially connected among a plurality
of paired Bluetooth devices in advance, and performing a Bluetooth connection only by pressing
a Bluetooth button.
[0035]
As described above, when the Bluetooth connection is completed and the portable music
reproduction device starts the reproduction operation, an audio signal is transmitted to the
sound reproduction device by the Bluetooth communication and reproduced by the speakers
101L and 101R. Even if the audio signal is not played back, the Bluetooth connection will be
maintained and transition to the low power consumption mode as needed.
[0036]
In addition, to disconnect the Bluetooth connection, select the Bluetooth off menu in Bluetooth
mode and make your selection. Besides this, the Bluetooth connection is disconnected also when
the power supply of the portable music player is turned off. Of course, the Bluetooth connection
is also disconnected by turning off the sound reproducing apparatus.
[0037]
These disconnection processes are intended by the user and are referred to as normal
disconnection. When the normal disconnection is performed, the communication module 16 of
the sound reproducing apparatus notifies the control unit 21 of the disconnection. On the other
hand, the Bluetooth connection may be disconnected even though the user did not intend. For
example, when the user carries the portable music playback device and moves out of the reach of
communication, for example, to another room, the antenna 17 can not receive the Bluetooth
signal itself. Such disconnection is called abnormal disconnection. The abnormal disconnection
notification is made from the communication module 16 to the control unit 21.
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[0038]
"Operation of One Embodiment" The operation of one embodiment of the present disclosure will
be described with reference to the flowcharts of Figs. 3 and 4. FIGS. 3 and 4 are originally one
flow chart, but are divided into two drawings in view of the restriction of drawing space. The
connection points between FIG. 3 and FIG. 4 are indicated by letters A to D.
[0039]
The processes of the audio reproduction unit 11, the control unit (CPU) 21 and the
communication module 16 of the sound reproduction apparatus 100 are shown, and the
processes of the portable music reproduction apparatus 110 are shown. The pairing between the
sound reproducing apparatus 100 and the portable music reproducing apparatus 110 has
already been completed. The first state of the sound reproducing apparatus 100 is the standby
state. That is, the power supply of the audio reproduction unit 11 is off, the control unit 21 is in
the standby process, and the communication module 16 is in the standby mode.
[0040]
The portable music player 110 is powered on, and the connection start process as described
above is performed. A connection request is notified from the portable music playback device
110 (step S1). Since the communication module 16 is in the standby mode, the communication
module 16 determines whether there is a connection request (step S2). When receiving the
notification of the connection request from the portable music reproduction device 110, the
portable music reproduction device 110 and the communication module 16 perform connection
processing (steps S3 and S4).
[0041]
When the connection process is normally performed, the Bluetooth connection state is
established (steps S5 and S6). The communication module 16 notifies the control unit 21 of the
connection completion (step S7). The control unit 21 determines the presence or absence of the
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notification of connection completion (step S8).
[0042]
When the control unit 21 receives the notification of the connection completion from the
communication module 16, the determination result of step S8 becomes affirmative, and a power
supply start command is generated in step S9. In response to the power supply start command,
the switch 25 is turned on (step S10), and the audio reproduction unit 11 is turned on (step S11).
[0043]
In step S12, the control unit 21 determines whether the input is Bluetooth. If it is determined
that an audio input (line input) other than Bluetooth is selected, the control unit 21 generates an
input switching command in step S13. An input switching command is supplied from the control
unit 21 to the selector and volume control unit 13, and audio input is controlled to select
Bluetooth (output of the communication module 16) (step S14). As described above, it is possible
to control to select Bluetooth as an input without operating the input changeover switch of the
sound reproducing apparatus 100 located at a distant place.
[0044]
Then, when the reproduction operation is started in the portable music reproduction device 110,
the audio signal can be reproduced by the sound reproduction device 100 from the portable
music reproduction device 110 by Bluetooth communication. This operation is represented by
transmitting the sound source of the portable music reproduction device 110 (step S15),
receiving the sound source of the communication module 16 (step S16), and reproducing the
sound reproduction unit 11 (step S17).
[0045]
Furthermore, it demonstrates with reference to the flowchart of FIG. In the portable music player
110, the disconnection operation of the Bluetooth communication as described above is
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performed, and the disconnection process is started (Step S21). A notification of disconnection
occurs (step S22). Such cleavage is referred to as normal cleavage. Then, the power supply of the
portable music player 110 is turned off (step S23).
[0046]
The communication module 16 determines the presence or absence of the disconnection
notification as shown in step S24. When the disconnection notification is received from the
portable music playback device 110, the result of the determination in step S24 becomes
affirmative, and a disconnection notification is generated to the control unit 21 after a
predetermined time (step S25). Thereafter, the communication module 16 is in the standby mode
(step S29). The predetermined time is, for example, one minute. The predetermined time may not
be fixed, and any of a plurality of times may be set according to the setting of the user. Since the
normal disconnection is an intentional disconnection made by operating the portable music
player 110, the disconnection process may be started immediately without waiting for a
predetermined time to elapse.
[0047]
The portable music reproduction device 110 is out of the reach of the radio wave when it goes
out of the room with the portable music reproduction device 110 as well as the normal cutting
by the operation of the portable music reproduction device 110 starting cutting. Suddenly, the
Bluetooth signal is lost. Unintended termination of the Bluetooth signal terminates Bluetooth
communication. Such disconnection is called abnormal disconnection.
[0048]
The communication module 16 determines the presence or absence of abnormal disconnection
(step S26). When the abnormal disconnection occurs, the determination result of step S26
becomes affirmative, and it is determined in step S27 whether the abnormal disconnection has
elapsed for a predetermined time. When the abnormal disconnection period becomes equal to or
longer than the predetermined time, the determination result of step S27 becomes affirmative,
and a disconnection notification to the control unit 21 is generated (step S28). The
predetermined time may not be fixed, and may be set to any of a plurality of times according to
the setting of the user.
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[0049]
The length of time from the reception of the above-described disconnection notification to
notification of disconnection to the control unit 21 and the length of time of determination of the
abnormal disconnection period are set identically or appropriately. Furthermore, although the
determination regarding these times is performed in the communication module 16, it may be
made in the CPU of the control unit 21. Furthermore, when the communication module 16 can
distinguish the normal disconnection and the abnormal disconnection and can notify the control
unit 21 as described above, it is possible to separately determine the time for each disconnection.
On the other hand, when the communication module 16 can not distinguish between the normal
disconnection and the abnormal disconnection, the time determination for both is made common.
[0050]
In step S30, since the control unit 21 determines the presence or absence of the notification of
disconnection, when the disconnection is notified by step S25 (normal disconnection) or step S28
(abnormal disconnection), the determination result of step S30 is positive. It becomes. In step
S31, the controller 21 generates a power-off command. Thereafter, the control unit 21 is in the
standby process (step S32). The switch 25 is turned off in response to the power supply
disconnection command generated by the control unit 21 (step S33), and the power supply to the
audio reproduction unit 11 is turned off (step S34).
[0051]
As described above, in the present disclosure, when the connection with the portable music
reproduction device 110 is completed, the power supply to the audio reproduction unit 11 is
turned on, and the music reproduced by the portable music reproduction device 110 is
reproduced by the speaker can do. Therefore, in order to turn on the power supply, it is not
necessary to go to the sound reproducing apparatus 100 at a distant place, and the operability
can be improved. Furthermore, in the portable music playback device 110, when the
communication disconnection operation is performed, the power supply to the audio playback
unit 11 is turned off. Furthermore, if the user moves to another room while holding the portable
music playback device 110, abnormal disconnection occurs. Also in this case, the power supply
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of the audio reproduction unit 11 can be turned off. Therefore, it is not necessary to go to the
place of the sound reproducing apparatus 100 at a remote place, the operability can be
improved, and unnecessary power consumption can be prevented.
[0052]
Note that the present disclosure can also have the following configurations. (1) A wireless
communication unit that receives an audio signal by wireless communication and outputs an
audio signal, an audio reproduction unit including a speaker that reproduces the audio signal,
and turning on the supply of the first power to the audio reproduction unit. And a control unit
configured to control an off state, the first power supply to the wireless communication unit and
the control unit being in a standby state in which the supply of the second power is on, and the
first control unit receives a connection notification from the wireless communication unit. Power
supply is turned on, the audio signal from the communication unit is reproduced by the audio
reproduction unit, and when the control unit receives a disconnection notification from the
wireless communication unit, the supply of the first power is turned off. The sound reproduction
apparatus in which the reproduction of the audio signal from the communication unit can be
stopped. (2) The sound according to (1), wherein the control unit receives a notification of cutoff
of the wireless signal from the wireless communication unit, and turns off the supply of the first
power when the period of cutoff is equal to or longer than a predetermined time. Playback
device. (3) The sound reproducing apparatus according to (1) or (2), wherein the length of the
predetermined time can be set. (4) The voice reproduction unit has a selection unit that selects
another voice signal other than the received voice signal from the wireless communication unit,
and the control unit receives the connection notification from the wireless communication unit.
The audio reproduction apparatus according to any one of (1) to (3), wherein the selection unit is
controlled to select a received audio signal. (5) The sound reproducing apparatus according to
any one of (1) to (4), wherein the volume of the sound signal to be reproduced is remotely
controlled by the wireless communication. (6) An audio signal is received by wireless
communication of the wireless communication unit, an audio signal is output, the audio
reproduction unit reproduces the audio signal, and a control unit supplies the first power to the
audio reproduction unit. In the standby state in which the supply of the second power to the
wireless communication unit and the control unit is on, and when the control unit receives a
connection notification from the wireless communication unit, the first power supply is
controlled. The supply is turned on, the audio signal from the communication unit is reproduced
by the audio reproduction unit, and when the control unit receives a disconnection notification
from the wireless communication unit, the supply of the first power is turned off, and the
communication unit is turned off. A sound reproduction method for making it possible to stop
the reproduction of the sound signal from.
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[0053]
Although the embodiments of the present disclosure have been specifically described above, the
present invention is not limited to the above-described embodiments, and various modifications
can be made based on the technical idea of the present disclosure. For example, the operation
method of the communication disconnection of the portable music playback device in the abovedescribed embodiment is an example, and another operation method may be used. Also, a
communication method other than Bluetooth may be used.
[0054]
11 иии Audio playback unit 13 иии Selector and volume control unit 15 и и и Line input terminal 16 и и и
Communication module 21 и и и Control unit 24 и и и DC input terminal 25 и и и switch 100 и и и и
Sound reproduction device 101L, 101R и и и Speaker 102 и и и power switch 110 и и и portable music
reproduction device
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