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JP2017076914

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DESCRIPTION JP2017076914
Abstract: [Problem] To provide a technology capable of reducing power consumption by
suppressing the output of useless audio signals. SOLUTION: An output volume level Vout of an
audio signal outputted from a wireless speaker 1 and an input volume level Vin of an audio
signal inputted to an audio controller 2 are compared to monitor a volume level ratio Vin / Vout
of the both. (S111). Then, when the volume level ratio Vin / Vout decreases by a predetermined
amount or more within a predetermined time (S113, S120), it is determined that the listener
carrying the audio controller 2 has left the room where the wireless speaker 1 is installed, and
the wireless speaker The volume volume value of 1 is set to zero, and the output of the audio
signal from the wireless speaker 1 is stopped (S114, S121). [Selected figure] Figure 2
Wireless speaker, controller, wireless audio system, and computer readable program
[0001]
The present invention relates to control technology of a wireless speaker.
[0002]
Patent Document 1 discloses a wireless audio system including a plurality of wireless speakers
classified into a plurality of groups, and capable of reproducing music data different for each
group.
In this wireless audio system, for each group, a plurality of wireless speakers belonging to the
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1
group perform arbitration to select one wireless speaker from among these wireless speakers.
Then, the selected wireless speaker serves as a group leader, receives an operation on a plurality
of wireless speakers belonging to the same group from the user, and transmits a control signal to
these wireless speakers. According to this wireless audio system, for example, a plurality of
wireless speakers are installed in each of a plurality of rooms, and different music data are
reproduced in each room by setting the wireless speakers installed in the same room in the same
group be able to.
[0003]
Further, Patent Document 2 discloses a technology for reducing the standby power of a wireless
speaker. In this technology, the wireless speaker is provided with a receiving circuit for
wirelessly receiving command data from the audio player, and when the wireless off command
data from the audio player is wirelessly received by the receiving circuit, the main power is
turned off and The power supply intermittently operates the receiving circuit.
[0004]
U.S. Pat. No. 7,987,294 Japanese Patent Application Laid-Open No. 2006-67336
[0005]
By the way, in the wireless audio system described in Patent Document 1, the listener in the
room where the wireless speaker that is outputting the music data is installed leaves the room
without stopping the output of the music data, and does not return to the room as it is In this
case, the output of the audio signal is continued even though no one is listening, and power is
wasted.
The technology described in Patent Document 2 is a technology for reducing the standby power
of the wireless speaker, and does not take into consideration the reduction of the power
consumption due to the useless output of the audio signal.
[0006]
The present invention has been made in view of the above circumstances, and an object thereof
is to provide a technology capable of reducing power consumption by suppressing the output of
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useless audio signals.
[0007]
In order to solve the above problems, in the present invention, the audio signal output from the
wireless speaker and the audio signal input to the microphone of the controller carried by the
user are compared. It is judged whether or not it has left.
Then, when it is determined that the listener has left the area around the wireless speaker, the
output of the audio signal from the wireless speaker is stopped.
[0008]
For example, one aspect of the present invention is a wireless speaker that reproduces and
outputs an audio signal according to a remote control of a controller, and output characteristic
measurement means for sequentially measuring the output characteristic of the audio signal
output within a predetermined time; Input characteristic receiving means for sequentially
receiving input characteristics of an audio signal inputted from the controller to the microphone
provided to the controller within the predetermined time, latest output characteristics measured
by the output characteristic measuring means, and reception of the input characteristics Means
for comparing the latest input characteristics received by the means, and based on the
comparison result, determining means for determining whether or not the listener possessing the
controller has left the periphery of the wireless speaker; and Audio signal when it is determined
that you have left the wireless speaker area And a control means for stopping the output of.
[0009]
Here, the output characteristic measurement unit sequentially measures, as the output
characteristic, an output volume level of the audio signal output from the wireless speaker within
the predetermined time, and the input characteristic reception unit determines the output
characteristic level within the predetermined time. An input volume level of an audio signal input
to a microphone included in the controller may be sequentially received as the input
characteristic.
Then, the judging means determines the listener when the ratio of the latest input sound volume
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level received by the input characteristics receiving means to the latest output sound volume
level measured by the output characteristics measuring means decreases by a predetermined
value or more. May be determined to be away from the periphery of the wireless speaker.
[0010]
Alternatively, the output characteristic measurement unit sequentially measures an output
waveform of an audio signal output from the wireless speaker within the predetermined time as
the output characteristic, and the controller receives the output characteristic reception unit
within the predetermined time. The input waveform of the audio signal input to the provided
microphone may be sequentially received as the input characteristic. Then, when the delay time
of the latest input waveform received by the input characteristic receiving unit with respect to
the latest output waveform measured by the output characteristic measuring unit becomes equal
to or more than a predetermined value, the determining unit determines It may be determined
that the wireless speaker is separated from the periphery.
[0011]
Another aspect of the present invention is a controller for remotely operating a wireless speaker
that reproduces and outputs an audio signal, and sequentially measures a microphone and an
input characteristic of an audio signal input to the microphone within a predetermined time.
Input characteristics measuring means, Output characteristics receiving means for sequentially
receiving output characteristics of audio signal outputted from the wireless speaker within the
predetermined time from the wireless speaker, and latest output received by the output
characteristics receiving means Determining means for comparing the characteristic and the
latest input characteristic measured by the input characteristic measuring means, and judging
whether or not the listener possessing the controller has left the periphery of the wireless
speaker based on the comparison result; The listener is determined to be away from the
periphery of the wireless speaker by means The case, and an output stop instruction
transmission means for transmitting to the wireless speaker output stop instruction for stopping
the output of the audio signal.
[0012]
Here, the input characteristic measurement unit sequentially measures, as the input
characteristic, an input volume level of an audio signal input to the microphone within the
predetermined time, and the output characteristic reception unit detects the wireless within the
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predetermined time. The output volume level of the audio signal output from the speaker may be
sequentially received as the output characteristic.
Then, the judging means determines that the listener is the one where the ratio of the latest input
sound volume level measured by the input characteristics measuring means to the latest output
sound volume level received by the output characteristics receiving means is decreased by a
predetermined value or more. May be determined to be away from the periphery of the wireless
speaker.
[0013]
Alternatively, the input characteristic measurement unit sequentially measures, as the input
characteristic, an input waveform of an audio signal input to the microphone within the
predetermined time, and the output characteristic reception unit receives the wireless speaker
from the wireless speaker within the predetermined time. The output waveform of the output
audio signal may be sequentially received as the output characteristic. Then, when the delay time
of the latest input waveform measured by the input characteristic measuring unit with respect to
the latest output waveform received by the output characteristic receiving unit becomes equal to
or more than a predetermined value, the judging unit determines that the listener May be
determined to be away from the periphery of the wireless speaker.
[0014]
In the present invention, the audio signal output from the wireless speaker and the audio signal
input to the microphone of the controller are compared, and from this comparison result, it is
determined whether the listener carrying this controller has left the wireless speaker or not. ing.
Then, when it is determined that the listener has left the area around the wireless speaker, the
output of the audio signal from the wireless speaker is stopped. For this reason, when the listener
in the room where the wireless speaker outputting the audio signal is installed can automatically
stop the output of the audio signal when leaving the room without stopping the output of the
audio signal, it is useless. Power consumption can be reduced.
[0015]
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5
FIG. 1 is a schematic block diagram of a wireless audio system according to a first embodiment of
the present invention. FIG. 2 is a sequence diagram for explaining the operation of the wireless
audio system according to the first embodiment of the present invention. FIG. 3 is a schematic
functional block diagram of the wireless speaker 1. FIG. 4 is a flowchart for explaining the
operation of the wireless speaker 1. FIG. 5 is a schematic functional block diagram of the audio
controller 2. FIG. 6 is a flowchart for explaining the operation of the audio controller 2. FIG. 7 is a
sequence diagram for explaining the operation of the wireless audio system according to the
second embodiment of the present invention. FIG. 8 is a schematic functional block diagram of
the wireless speaker 1a. FIG. 9 is a flowchart for explaining the operation of the wireless speaker
1a. FIG. 10 is a schematic functional block diagram of the audio controller 2a. FIG. 11 is a
flowchart for explaining the operation of the audio controller 2a.
[0016]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0017]
First Embodiment FIG. 1 is a schematic block diagram of a wireless audio system according to a
first embodiment of the present invention.
[0018]
As illustrated, the wireless audio system according to the present embodiment is a portable audio
device provided with a plurality of wireless speakers 1-1 to 1-3 (hereinafter also referred to
simply as wireless speaker 1) to which an ID has been assigned, and a microphone, respectively.
It comprises an audio controller 2 which is a terminal, and a media server 3 and an access point
4 connected to a network 5.
Here, it is assumed that the wireless speakers 1-1 to 1-3 are respectively installed in the rooms A
to C.
[0019]
The wireless speaker 1 is connected to the audio controller 2 and the media server 3 via the
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access point 4, acquires music data from the media server 3 according to a reproduction
instruction received from the audio controller 2, and reproduces and outputs it as an audio signal
.
The wireless speaker 1 sequentially measures the output volume level of the audio signal output
from the wireless speaker 1 within a predetermined time, and sequentially receives the input
volume level of the audio signal from the audio controller 2. Then, by comparing the received
latest input volume level with the measured latest output volume level, it is judged whether the
listener carrying the audio controller 2 has left the room where the own wireless speaker 1 is
installed, and has left the room. When it is determined that the output of the audio signal is
stopped.
[0020]
The audio controller 2 is also connected to the wireless speaker 1 and the media server 3 via the
access point 4, and a playback instruction including specification of music data selected by the
listener from among music data stored in the media server 3. Are transmitted to the output
destination wireless speaker 1 of the music data. Also, the audio controller 2 sequentially
measures the input volume level of the audio signal input to the microphone within a
predetermined time, and transmits it to the output destination wireless speaker 1 of the music
data.
[0021]
FIG. 2 is a flowchart for explaining the operation of the wireless audio system according to the
present embodiment. Here, the case where the listener carrying the audio controller 2 enjoys
music using the wireless speaker 1-1 installed in the room A is described as an example.
[0022]
First, the audio controller 2 uses the listener in room A carrying the audio controller 2 to select
music with the specification of the music data to be reproduced and the ID of the wireless
speaker 1-1 as the output destination of the music data. If accepted (S100), the reproduction
instruction accompanied by the specification of the music data to be reproduced and the ID of
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the wireless speaker 1-1 is broadcasted on the network 5 (S101). Also, the microphone provided
in the audio controller 2 is turned on (S102).
[0023]
Next, when the wireless speaker 1-1 receives from the network 5 a reproduction instruction
accompanied by the specification of the ID of the wireless speaker 1-1, the medium transmits a
music data request accompanied by the specification of the music data specified by the
reproduction instruction. It transmits to the server 3 (S103). In response to this, the media server
3 specifies, from among the music data stored in the own media server 3, the music data
designated by the music data request received from the wireless speaker 1-1, and this music data
Are transmitted to the wireless speaker 1-1 (S104). When receiving the music data from the
media server 3, the wireless speaker 1-1 starts reproduction of the music data to an audio signal
and output of the reproduced audio signal (S105). In addition, the wireless speaker 1-1 starts
measurement of the output volume level Vout of the audio signal output within a predetermined
time T2 (for example, 1 second) every predetermined interval T1 (for example, 1 second) (S106).
[0024]
On the other hand, when the audio controller 2 detects that the audio signal output from the
wireless speaker 1-1 is input to the microphone provided in the own audio controller 2 (S107),
the audio controller 2 is within the predetermined time T2 every predetermined interval T1. The
measurement of the input volume level Vin of the audio signal input to the microphone is started
(S108). Then, the audio controller 2 notifies the input sound level notification (Vin notification)
accompanied by the designation of the newly measured input sound level Vin and the ID of the
wireless speaker 1-1 every time the input sound level Vin is newly measured. Are broadcast on
the network 5 (S109).
[0025]
In response to this, the wireless speaker 1-1 starts receiving from the network 5 the notification
of the input volume level accompanied by the specification of the ID of the wireless speaker 1-1
(S110). Then, every time when an input volume level notification is newly received, an output
volume level Vout newly measured by the wireless speaker 1-1 of the input volume level Vin
included in the newly received input volume level notification. The volume level ratio Vin / Vout
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indicating the ratio to the volume ratio is obtained, and the change of the volume level ratio Vin /
Vout is monitored (S111).
[0026]
Here, the listener carrying the audio controller 2 leaves the room A (S112), thereby reducing the
input volume level Vin of the audio signal input to the microphone of the audio controller 2, and
as a result, the wireless speaker 1- It is assumed that the volume level ratio Vin / Vout calculated
at 1 is sharply reduced. When the wireless speaker 1-1 detects that the volume level ratio Vin /
Vout has dropped by a predetermined value P (for example, 5 dB) or more within a
predetermined time T3 (for example, 4 to 6 seconds) (S113), the listener leaves the room A It is
determined that the value of the volume volume Vol of the own wireless speaker 1-1 is registered
as resume information, and the volume volume Vol is changed to a zero value to stop the output
of the audio signal (S114). Thereafter, it waits for a predetermined time-out time T4 (for example,
3 minutes) to elapse.
[0027]
Thereafter, it is assumed that the listener carrying the audio controller 2 has entered the room A
again before the timeout time T4 has passed (S115). When the audio controller 2 receives from
the listener a recovery operation involving specification of the ID of the wireless speaker 1-1
(S116), the audio controller 2 broadcasts on the network 5 a recovery instruction accompanied
by specification of the ID of the wireless speaker 1-1 (S116). S117).
[0028]
When the wireless speaker 1-1 receives from the network 5 a recovery instruction accompanied
by the specification of the ID of its own wireless speaker 1-1 before the timeout time T4 elapses
after the output of the audio signal is stopped, the value of the volume volume Vol is The output
of the audio signal is resumed by changing the zero value to a value registered as resume
information (S118).
[0029]
After that, the listener carrying the audio controller 2 leaves the room A again (S119), whereby
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the input volume level Vin of the audio signal input to the microphone of the audio controller 2
decreases, and as a result, the wireless speaker 1- It is assumed that the volume level ratio Vin /
Vout calculated at 1 is sharply reduced.
When the wireless speaker 1-1 detects that the volume level ratio Vin / Vout has decreased by
the predetermined value P or more within the predetermined time T3 (S120), it determines that
the listener has left the room A, and the wireless speaker 1-1 itself The value of the volume
volume Vol is registered as resume information, and the output of the audio signal is stopped by
changing the volume volume Vol to a zero value (S121). Thereafter, it waits for the timeout time
T4 to elapse.
[0030]
When the listener carrying the audio controller 2 does not enter the room A again and the
timeout time T4 elapses, the wireless speaker 1-1 detects the timeout (S122) and stops the
reproduction of the music data to the audio signal. Power off (S123).
[0031]
Next, the details of the wireless speaker 1 and the audio controller 2 of the wireless audio system
according to the present embodiment will be described.
In addition, since the existing media server and access point can be utilized for the media server
3 and the access point 4, the detailed description is abbreviate | omitted.
[0032]
First, the wireless speaker 1 will be described.
[0033]
FIG. 3 is a schematic functional block diagram of the wireless speaker 1.
The functional configuration of the wireless speaker 1 shown in this figure is, for example, a
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computer including a CPU, a memory, an auxiliary storage device such as a flash memory, a
wireless communication device such as a wireless LAN adapter, and a speaker. It is realized by
loading a predetermined program from the auxiliary storage onto the memory and executing it.
[0034]
As illustrated, the wireless speaker 1 outputs the speaker unit 10, the wireless network interface
unit 11, the instruction receiving unit 12, the music data acquisition unit 13, the music data
storage unit 14, the music data reproduction unit 15, and A volume level measurement unit 16,
an input volume level reception unit 17, a room exit determination unit 18, and a main control
unit 19 are provided.
[0035]
The wireless network interface unit 11 is an interface for communicating with the audio
controller 2 via the access point 4 and for communicating with the media server 3 connected to
the network 5.
[0036]
The instruction receiving unit 12 receives, from the audio controller 2 via the wireless network
interface unit 11, various instructions to which the ID of the own wireless speaker 1 is given.
[0037]
The music data acquisition unit 13 transmits a music data request including specification of
music data to be reproduced to the media server 3 via the wireless network interface unit 11,
and acquires music data to be reproduced from the media server 3.
[0038]
The music data storage unit 14 stores the music data acquired by the music data acquisition unit
13 from the media server 3.
[0039]
The music data reproduction unit 15 reproduces the music data stored in the music data storage
unit 14 as an audio signal and outputs the audio signal from the speaker unit 10.
[0040]
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The output sound volume level measurement unit 16 averages the output sound volume of the
audio signal output from the speaker unit 10 by the music data reproduction unit 15 within a
predetermined time T2 (for example, 1 second) every predetermined interval T1 (for example, 1
second) Measure the output volume level Vout.
[0041]
The input volume level receiving unit 17 receives, via the wireless network interface unit 11, an
input volume level notification accompanied by the ID of the wireless speaker 1 of its own
periodically transmitted from the audio controller 2.
[0042]
The room judgment unit 18 outputs the input volume level Vin included in the input volume level
notification every time the input volume level reception unit 17 newly receives an input volume
level notification accompanied by the ID of the wireless speaker 1 of itself. A volume level ratio
Vin / Vout indicating a ratio to the latest output volume level Vout measured by the volume level
measurement unit 16 is obtained.
Then, based on the change in the volume level ratio Vin / Vout, it is determined whether the
listener carrying the audio controller 2 has left the room in which the wireless speaker 1 is
installed.
[0043]
The main control unit 19 centrally controls the units 10 to 18 of the wireless speaker 1.
Further, the main control unit 19 controls reproduction / output of music data by the music data
reproduction unit 15 and on / off of power based on the determination result of the room
judgment unit 18.
[0044]
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FIG. 4 is a flowchart for explaining the operation of the wireless speaker 1.
This flow is started by the instruction receiving unit 12 receiving, from the audio controller 2 via
the wireless network interface unit 11, a reproduction instruction to which the ID of the own
wireless speaker 1 is given.
[0045]
First, the instruction receiving unit 12 passes the received reproduction instruction to the main
control unit 19.
In response to this, the main control unit 19 notifies the music data acquisition unit 13 of the
music data to be reproduced specified by the reproduction instruction.
Then, the music data acquisition unit 13 transmits a music data request including the
specification of the music data notified from the main control unit 19 to the media server 3 via
the wireless network interface unit 11 (S200).
[0046]
Next, the music data acquisition unit 13 receives music data from the media server 3 and stores
the music data in the music data storage unit 14 (S201).
Further, the main control unit 19 is notified of the acquisition completion of the music data.
In response to this, the main control unit 19 notifies the music data reproduction unit 15 of
music data to be reproduced.
The music data reproduction unit 15 reads the music data to be reproduced from the music data
storage unit 14 and reproduces it as an audio signal, and outputs the reproduced audio signal
from the speaker unit 10 (S202).
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[0047]
Next, when the audio signal reproduction by the music data reproduction unit 15 is started, the
output sound volume level measurement unit 16 is output from the speaker unit 10 by the music
data reproduction unit 15 within a predetermined time T2 every predetermined interval T1. The
output volume level Vout, which is the average value of the output volume of the audio signal, is
measured (S203).
[0048]
Here, when the audio signal reproduction by the music data reproduction unit 15 is completed
(YES in S205), the main control unit 19 ends the present flow.
On the other hand, the input volume level reception unit 17 periodically transmits the ID of the
wireless speaker 1 from the audio controller 2 until the audio signal reproduction by the music
data reproduction unit 15 ends (NO in S205). When the accompanying input volume level
notification (Vin notification) is received via the wireless network interface unit 11 (YES in S204),
the input volume level Vin included in the input volume level notification is passed to the room
exit determination unit 18. In response to this, the room judgment unit 18 determines the
volume level ratio Vin indicating the ratio of the input volume level Vin received from the input
volume level reception unit 17 to the latest output volume level Vout measured by the output
volume level measurement unit 16. / Vout is calculated and stored (S206).
[0049]
Then, the room judgment unit 18 judges whether the volume level ratio Vin / Vout calculated
before the predetermined time T3 (for example, 4 to 6 seconds) is stored (S207). If the volume
level ratio Vin / Vout calculated before the predetermined time T3 is not stored (NO in S207), the
process returns to S204.
[0050]
On the other hand, when the volume level ratio Vin / Vout calculated before the predetermined
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time T3 is stored (YES in S207), the room judgment unit 18 determines the volume level ratio
Vin / Vout calculated before this predetermined time T3. The volume level ratio Vin / Vout newly
calculated this time is compared with the volume level ratio Vin / Vout newly calculated this time
from the volume level ratio Vin / Vout calculated the predetermined time T3 before the
predetermined value P It is determined whether or not (for example, 5 dB) or more has dropped
(S208). If the volume level ratio Vin / Vout newly calculated this time is not lower than the
volume level ratio Vin / Vout calculated before the predetermined time T3 by the predetermined
value P or more (NO in S208), the process returns to S204.
[0051]
On the other hand, when the volume level ratio Vin / Vout newly calculated this time is lower
than the volume level ratio Vin / Vout calculated before the predetermined time T3 by the
predetermined value P or more (YES in S208), the room judgment unit 18 Notifies the main
control unit 19 to that effect. In response to this, the main control unit 19 registers the value of
the volume volume Vol of the music data reproduction unit 15 as resume information (S209),
and changes the volume volume Vol of the music data reproduction unit 15 to a zero value, The
audio signal output from the speaker unit 10 is stopped (S210). At this time, the output sound
volume level measurement unit 16 may stop the measurement of the output sound volume level
Vout.
[0052]
Thereafter, the main control unit 19 waits until the audio signal reproduction by the music data
reproduction unit 15 ends (NO in S215), and until time-out due to the passage of a
predetermined timeout time T4 (for example, 3 minutes) In the meantime (NO in S213), it waits
for reception of a recovery instruction from the audio controller 2 via the wireless network
interface unit 11 and the instruction receiving unit 12 (S211). When receiving from the audio
controller 2 a recovery instruction accompanied by designation of the ID of the wireless speaker
1 itself via the wireless network interface unit 11 (YES in S211), the instruction receiving unit 12
notifies the main control unit 19 of this. In response to this, the main control unit 19 changes the
volume volume Vol of the music data reproduction unit 15 from the zero value to the value
registered as resume information, and resumes the audio signal output from the speaker unit 10
(S212). When the measurement of the volume level Vout is stopped while the output of the audio
signal output from the speaker unit 10 is stopped, the measurement of the output volume level
Vout by the output volume level measurement unit 16 is resumed. Then, it returns to S204.
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15
[0053]
On the other hand, while the audio signal reproduction by the music data reproduction unit 15 is
completed (NO in S215), a recovery instruction is not received from the audio controller 2 via the
wireless network interface unit 11 and the instruction reception unit 12 (S211) If the main
control unit 19 causes the music data reproduction unit 15 to stop the reproduction of the audio
signal from the music data, then the main power is turned on. It turns off (S214), and this flow is
ended.
[0054]
Further, the main control unit 19 does not receive a recovery instruction from the audio
controller 2 via the wireless network interface unit 11 and the instruction receiving unit 12
before the predetermined timeout time T4 elapses (NO in S213) (S211) When the audio signal
reproduction by the music data reproduction unit 15 is completed (YES in S215), this flow is
ended.
[0055]
Next, the audio controller 2 will be described.
[0056]
FIG. 5 is a schematic functional block diagram of the audio controller 2.
The functional configuration of the audio controller 2 shown in this figure is, for example, a CPU,
a memory, an auxiliary storage device such as a flash memory, an input / output device such as a
touch panel, a display or a pointing device, and a wireless communication device such as a
wireless LAN adapter In a portable computer such as a smart phone and a tablet PC, each having
a microphone and a microphone, the CPU loads the predetermined program from the auxiliary
storage device onto the memory and executes the program.
[0057]
As illustrated, the audio controller 2 includes a microphone unit 20, a wireless network interface
unit 21, a graphical user interface unit 22, a reproduction instruction transmission unit 23, a
recovery instruction transmission unit 24, and an input volume level measurement unit 25. , And
an input volume level notification unit 26 and a main control unit 27.
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[0058]
The wireless network interface unit 21 is an interface for communicating with the wireless
speaker 1 via the access point 4.
[0059]
The graphical user interface unit 22 is an interface for displaying information and receiving
various operations from the user.
[0060]
The reproduction instruction transmission unit 23 broadcasts, from the wireless network
interface unit 21, a reproduction instruction including specification of the music data to be
reproduced and the ID of the output destination wireless speaker 1 of the music data.
[0061]
The restoration instruction transmission unit 24 broadcasts a restoration instruction
accompanied by the specification of the ID of the output destination wireless speaker 1 of the
music data from the wireless network interface unit 21.
[0062]
The input volume level measurement unit 25 sets an input volume level Vin, which is an average
value of input volumes of audio signals input to the microphone unit 20 within a predetermined
time T2 (for example, 1 second), every predetermined interval T1 (for example, 1 second).
Measure
[0063]
The input volume level notification unit 26 notifies the input volume level with the specification
of the input volume level Vin and the ID of the output destination wireless speaker 1 of the music
data each time the input volume level measurement unit 25 measures the input volume level Vin.
Are broadcasted from the wireless network interface unit 21.
[0064]
The main control unit 27 centrally controls the units 20 to 26 of the audio controller 2.
01-05-2019
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[0065]
FIG. 6 is a flowchart for explaining the operation of the audio controller 2.
This flow is started by the main control unit 27 receiving, from the listener via the graphical user
interface unit 22, a music selection operation involving specification of the music data to be
reproduced and the ID of the output destination wireless speaker 1 of the music data. .
[0066]
First, the main control unit 27 passes the music data to be reproduced and the ID of the output
destination wireless speaker 1 of the music data to the reproduction instruction transmission
unit 23.
In response to this, the reproduction instruction transmission unit 23 broadcasts a reproduction
instruction including specification of the music data to be reproduced and the ID of the output
destination wireless speaker 1 of the music data from the wireless network interface unit 21
(S300).
[0067]
Next, the main control unit 27 turns on the microphone unit 20 (S301), and waits for an audio
signal to be input to the microphone unit 20 (S302).
Then, when an audio signal is input to the microphone unit 20 (YES in S302), the input volume
level measurement unit 25 is instructed to start the measurement of the input volume level Vin,
and the input volume level notification unit 26 outputs the music data The ID of the destination
wireless speaker 1 is notified, and the start of transmission of the input volume level notification
is instructed.
In response to this, the input volume level measurement unit 25 measures an input volume level
01-05-2019
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Vin which is an average value of input volumes of audio signals input to the microphone unit 20
within a predetermined time T2 at predetermined intervals T1.
Then, each time the input volume level measurement unit 25 measures the input volume level
Vin, the input volume level notification unit 26 specifies the input volume level Vin and the ID of
the output destination wireless speaker 1 of the music data. The level notification is broadcasted
from the wireless network interface unit 21 (S303).
[0068]
Next, when the main control unit 27 receives a recovery operation involving specification of the
ID of the output destination wireless speaker 1 of music data from the listener via the graphical
user interface unit 22 (YES in S304), the output destination wireless speaker The ID of 1 is
passed to the recovery instruction transmission unit 24.
In response to this, the recovery instruction transmission unit 24 broadcasts a recovery
instruction accompanied by the specification of the ID of the output destination wireless speaker
1 from the wireless network interface unit 21 (S305).
[0069]
Further, when the main control unit 27 receives an end operation of remote control of the
wireless speaker 1 from the listener via the graphical user interface unit 22 (YES in S306), the
measurement of the input volume level Vin to the input volume level measurement unit 25 is
completed. And instructs the input volume level notification unit 26 to end transmission of the
input volume level notification.
In response to this, the input volume level measurement unit 25 ends the measurement of the
input volume level Vin.
Also, the input volume level notification unit 26 ends the broadcast transmission of the input
volume level notification (S307).
01-05-2019
19
[0070]
Then, the main control unit 27 turns off the microphone unit 20 (S308), and ends this flow.
[0071]
The first embodiment of the present invention has been described above.
[0072]
In the present embodiment, the output volume level Vout of the audio signal output from the
speaker unit 10 of the wireless speaker 1 and the input volume level Vin of the audio signal input
to the microphone unit 20 of the audio controller 2 are compared. From the volume level ratio
Vin / Vout, it is determined whether the listener carrying the audio controller 2 has left the room
where the wireless speaker 1 is installed.
Then, when it is determined that the listener has left the room, the output of the audio signal
from the wireless speaker 1 is stopped.
Therefore, when the listener in the installation room of the wireless speaker 1 outputting the
audio signal leaves the room without stopping the output of the audio signal, the output of the
audio signal can be automatically stopped, which is useless. The power consumption can be
reduced by suppressing the output of the audio signal.
[0073]
Further, in the present embodiment, when the wireless speaker 1 receives a recovery instruction
from the audio controller 2 before the predetermined time-out time T4 elapses after stopping the
output of the audio signal, the wireless speaker 1 receives the volume volume Vol before
stopping the output of the audio signal. Return to state and resume output of audio signal.
On the other hand, when a timeout occurs after the timeout time T4 without receiving a recovery
instruction from the audio controller 2, the reproduction of the music data to the audio signal is
stopped, and the power is turned off.
01-05-2019
20
Therefore, when the listener carrying the audio controller 2 comes back from the installation
room of the wireless speaker 1 immediately after leaving the room, it is possible to continue to
enjoy the music data with a simple operation, but when not leaving the room. Since the power of
the wireless speaker 1 can be automatically cut off, the power consumption of the wireless
speaker 1 can be efficiently reduced.
[0074]
In the present embodiment, it is determined that the listener carrying the audio controller 2 has
left the installation room of the wireless speaker 1 when the volume level ratio Vin / Vout
decreases by the predetermined value P or more within the predetermined time T3. (S113, S120
of FIG. 2, S208 of FIG. 4). However, when the listener intentionally lowers the volume of the
wireless speaker 1, depending on the performance of the microphone unit 20 of the audio
controller 2, there is a possibility that the listener may misjudge that it has left the room.
Therefore, even if the volume level ratio Vin / Vout decreases by the predetermined value P or
more within the predetermined time T3, if the volume volume is less than the predetermined
value, it may be determined that the listener has left the room.
[0075]
In the above embodiment, the output volume level Vout of the audio signal output from the
speaker unit 10 of the wireless speaker 1 is compared with the input volume level Vin of the
audio signal input to the microphone unit 20 of the audio controller 2. From the volume level
ratio Vin / Vout of the two, it is determined whether the listener carrying the audio controller 2
has left the room where the wireless speaker 1 is installed. However, the present invention is not
limited to this. According to the present invention, the audio controller 2 is portable based on the
comparison result between the output characteristic of the audio signal output from the speaker
unit 10 of the wireless speaker 1 and the input characteristic of the audio signal input to the
microphone unit 20 of the audio controller 2. It may be determined whether or not the listener to
be removed has left the periphery of the wireless speaker 1.
[0076]
01-05-2019
21
For example, the wireless speaker 1 measures the output waveform of the audio signal output
from the speaker unit 10 within the predetermined time T2 at predetermined intervals T1, and
the audio controller 2 detects the output waveform within the predetermined time T2 at
predetermined intervals T1. The input waveform of the audio signal input to the microphone unit
20 is measured and transmitted to the wireless speaker 1. Then, in the wireless speaker 1, the
latest output waveform measured and the latest input waveform received from the audio
controller 2 are compared, and it is determined whether the delay time (phase difference) with
respect to the output waveform of the input waveform is a predetermined time or more It is
determined based on whether the listener carrying the audio controller 2 has left the periphery
of the wireless speaker 1 or not.
[0077]
Second Embodiment A wireless audio system according to the present embodiment is different
from the wireless audio system according to the first embodiment shown in FIG. The points 1a-1
to 1a-3 (hereinafter also referred to simply as the wireless speaker 1a) are used, and the audio
controller 2a is used instead of the audio controller 2. Others are similar to the wireless audio
system according to the first embodiment shown in FIG.
[0078]
The wireless speaker 1a is connected to the audio controller 2a and the media server 3 via the
access point 4 and acquires music data from the media server 3 according to the reproduction
instruction received from the audio controller 2a, and reproduces and outputs it as an audio
signal Do. Also, the wireless speaker 1a sequentially measures the output volume level of the
audio signal output from the wireless speaker 1a within a predetermined time, and transmits it to
the audio controller 2a of the reproduction instruction transmission source. Also, the output of
the audio signal is stopped according to the output stop instruction of the audio controller 2a.
[0079]
The audio controller 2a is also connected to the wireless speaker 1a and the media server 3 via
the access point 4, and a playback instruction including specification of music data selected by
the listener from among music data stored in the media server 3 Is transmitted to the output
destination wireless speaker 1a of the music data. In addition, the audio controller 2a
01-05-2019
22
sequentially measures the input volume level of the audio signal input to the microphone within
a predetermined time, and sequentially receives the output volume level of the audio signal from
the wireless speaker 1a. Then, by comparing the input volume level with the output volume level,
it is determined whether the listener carrying the audio controller 2a has left the installation
room of the wireless speaker 1a, and the listener exits the installation room of the wireless
speaker 1a. When it is determined that the output of the audio signal is stopped, the output
destination wireless speaker 1a of the music data is transmitted.
[0080]
FIG. 7 is a flowchart for explaining the operation of the wireless audio system according to the
present embodiment. Here, the case where the listener carrying the audio controller 2a enjoys
music using the wireless speaker 1a-1 installed in the room A is described as an example.
[0081]
First, the audio controller 2a selects music from the listener in room A carrying the audio
controller 2a, specifying the music data to be reproduced and the ID of the wireless speaker 1a-1
as the output destination of the music data. If accepted (S150), the reproduction instruction
accompanied by the specification of the music data to be reproduced and the ID of the wireless
speaker 1a-1 is broadcasted on the network 5 (S151). Also, the microphone provided in the audio
controller 2a is turned on (S152).
[0082]
Next, when the wireless speaker 1a-1 receives from the network 5 a reproduction instruction
accompanied by the specification of the ID of the wireless speaker 1a-1, the medium transmits a
music data request accompanied by the specification of the music data specified by the
reproduction instruction. It transmits to the server 3 (S153). In response to this, the media server
3 specifies, from among the music data stored in the own media server 3, the music data
designated by the music data request received from the wireless speaker 1a-1, and the music
data Are transmitted to the wireless speaker 1a-1 (S154). Upon receiving the music data from the
media server 3, the wireless speaker 1a-1 starts reproducing the music data to an audio signal
and outputting the reproduced audio signal (S155). Also, the wireless speaker 1a-1 starts
measuring the output sound volume level Vout of the audio signal output within a predetermined
01-05-2019
23
time T2 (for example, one second) at every predetermined interval T1 (for example, one second)
(S156). Then, each time the output volume level Vout is newly measured, an output volume level
notification (Vout notification) accompanied by the newly measured output volume level Vout is
transmitted to the audio controller 2a that is the transmission source of the reproduction
instruction. (S157).
[0083]
On the other hand, when the audio controller 2a detects that the audio signal output from the
wireless speaker 1a-1 is input to the microphone provided in the own audio controller 2a (S158),
the audio controller 2a is within the predetermined time T2 every predetermined interval T1. The
measurement of the input volume level Vin of the audio signal input to the microphone is started
(S159), and the reception of the output volume level notification from the wireless speaker 1a-1
is started (S160). Then, every time the audio controller 2a newly receives an output volume level
notification, the audio controller 2a newly measures an input measured by the own audio
controller 2a with respect to the output volume level Vout included in the newly received output
volume level notification. A volume level ratio Vin / Vout indicating the ratio of the volume level
Vin is obtained, and a change in the volume level ratio Vin / Vout is monitored (S161).
[0084]
Here, the listener carrying the audio controller 2a leaves the room A (S162), whereby the input
volume level Vin of the audio signal input to the microphone of the audio controller 2a
decreases, and as a result, the audio controller 2a It is assumed that the calculated volume level
ratio Vin / Vout falls sharply. When the audio controller 2a detects that the volume level ratio
Vin / Vout has dropped by a predetermined value P (for example, 5 dB) or more within a
predetermined time T3 (for example, 4 to 6 seconds) (S163), the listener has left the room A It is
determined that the output stop instruction accompanied by the specification of the ID of the
output destination wireless speaker 1a-1 of the music data is broadcasted (S164). Thereafter, it
waits for a predetermined time-out time T4 (for example, 3 minutes) to elapse.
[0085]
On the other hand, when the wireless speaker 1a-1 receives, from the audio controller 2a, an
output stop instruction accompanied by the specification of the ID of its own wireless speaker 1a-
01-05-2019
24
1, it registers the value of the volume volume Vol of its own wireless speaker 1a-1 as resume
information. At the same time, the volume volume Vol is changed to a zero value to stop the
output of the audio signal (S165). At this time, the wireless speaker 1a-1 may stop measuring the
output sound volume level Vout.
[0086]
Next, it is assumed that the listener carrying the audio controller 2a has re-entered the room A
(S166). When the audio controller 2a receives from the listener a recovery operation involving
specification of the ID of the wireless speaker 1a-1 from the listener before the timeout time T4
elapses (S167), a recovery instruction accompanied by specification of the ID of the wireless
speaker 1a-1 is networked Broadcast on 5 (S168).
[0087]
When the wireless speaker 1a-1 receives from the audio controller 2a a recovery instruction
accompanied by the specification of the ID of its own wireless speaker 1a-1, the value of the
volume volume Vol is changed from a zero value to a value registered as resume information. ,
Resume the output of the audio signal (S169). If the measurement of the volume level Vout is
stopped while the output of the audio signal output is stopped, the wireless speaker 1a-1
resumes the measurement of the output volume level Vout.
[0088]
Next, the listener carrying the audio controller 2a leaves the room A again (S170), thereby
reducing the input volume level Vin of the audio signal input to the microphone of the audio
controller 2a, and as a result, the audio controller 2a It is assumed that the volume level ratio Vin
/ Vout calculated in the above is sharply decreased. When the audio controller 2a detects that
the volume level ratio Vin / Vout has decreased by the predetermined value P or more within the
predetermined time T3 (S171), it determines that the listener has left the room A, and outputs
the music data data to the wireless speaker The output stop instruction accompanied by the
designation of the ID 1a-1 is broadcasted (S172). At this time, the wireless speaker 1a-1 may stop
measuring the output sound volume level Vout. Thereafter, it waits for a predetermined time-out
time T4 (for example, 3 minutes) to elapse.
01-05-2019
25
[0089]
On the other hand, when the wireless speaker 1a-1 receives, from the audio controller 2a, an
output stop instruction accompanied by the specification of the ID of its own wireless speaker 1a1, it registers the value of the volume volume Vol of its own wireless speaker 1a-1 as resume
information. At the same time, the volume volume Vol is changed to a zero value, and the output
of the audio signal is stopped (S173).
[0090]
Next, when the listener carrying the audio controller 2a passes the time-out time T4 without
entering the room A again (S174), the audio controller 2a issues a power-off instruction
accompanied by designation of the wireless speaker 1a-1 ID. It broadcasts on the network 5
(S175).
[0091]
On the other hand, when the wireless speaker 1a-1 receives from the audio controller 2a a
power-off instruction accompanied by the specification of the ID of the wireless speaker 1a-1, the
wireless speaker 1a-1 stops the reproduction of the music data to an audio signal and turns off
the power. (S176).
[0092]
Next, the details of the wireless speaker 1a and the audio controller 2a of the wireless audio
system according to the present embodiment will be described.
[0093]
First, the wireless speaker 1a will be described.
[0094]
FIG. 8 is a schematic functional block diagram of the wireless speaker 1a.
The functional configuration of the wireless speaker 1a shown in this figure is, for example, in a
computer provided with a CPU, a memory, an auxiliary storage device such as a flash memory, a
wireless communication device such as a wireless LAN adapter, and a speaker It is realized by
01-05-2019
26
loading a predetermined program from the auxiliary storage onto the memory and executing it.
[0095]
As illustrated, the wireless speaker 1a includes a speaker unit 10, a wireless network interface
unit 11, an instruction receiving unit 12, a music data acquisition unit 13, a music data storage
unit 14, a music data reproduction unit 15, and an output. A volume level measurement unit 16,
an output volume level notification unit 30, and a main control unit 31 are provided.
Here, components having the same functions as those of the wireless speaker 1 of the first
embodiment shown in FIG. 3 are denoted by the same reference numerals.
[0096]
The output sound volume level notification unit 30 is reproducing the output sound volume level
notification accompanied by the output sound volume level Vout to the audio signal by the music
data reproduction unit 15 every time the output sound volume level Vout is measured by the
output sound volume level measurement unit 16 The audio data is transmitted to the audio
controller 2a, which is the transmission source of the reproduction instruction for the music data,
via the wireless network interface 11.
[0097]
The main control unit 31 centrally controls the units 10 to 16 and 30 of the wireless speaker 1a.
Further, the main control unit 31 controls reproduction / output of music data by the music data
reproduction unit 15 and on / off of power based on an instruction received from the audio
controller 2 a via the instruction reception unit 12.
[0098]
FIG. 9 is a flowchart for explaining the operation of the wireless speaker 1a.
01-05-2019
27
This flow is started by the instruction receiving unit 12 receiving a reproduction instruction to
which the ID of the wireless speaker 1a is assigned from the audio controller 2a via the wireless
network interface unit 11.
[0099]
First, the instruction receiving unit 12 passes the received reproduction instruction to the main
control unit 31.
In response to this, the main control unit 31 notifies the output volume level notification unit 30
of the address of the audio controller 2a which is the transmission source of the reproduction
instruction, and the music data of the reproduction target designated by the reproduction
instruction The data acquisition unit 13 is notified.
Then, the music data acquisition unit 13 transmits a music data request including the
specification of the music data notified from the main control unit 31 to the media server 3 via
the wireless network interface unit 11 (S250).
[0100]
Next, the music data acquisition unit 13 receives music data from the media server 3 and stores
the music data in the music data storage unit 14 (S251). Further, the main control unit 31 is
notified of acquisition completion of music data. In response to this, the main control unit 31
notifies the music data reproduction unit 15 of music data to be reproduced. Then, the music
data reproduction unit 15 reads the music data to be reproduced from the music data storage
unit 14 and reproduces it as an audio signal, and outputs the reproduced audio signal from the
speaker unit 10 (S252).
[0101]
Next, when the audio signal reproduction by the music data reproduction unit 15 is started, the
output sound volume level measurement unit 16 is output from the speaker unit 10 by the music
01-05-2019
28
data reproduction unit 15 within a predetermined time T2 every predetermined interval T1. The
output volume level Vout, which is the average value of the output volume of the audio signal, is
measured. Then, every time the output volume level measuring unit 16 measures the output
volume level Vout, the output volume level notification unit 30 sends an output volume level
notification accompanied by the output volume level Vout via the wireless network interface unit
11. It transmits to the audio controller 2a specified by the address notified from the main control
unit 31 (S253).
[0102]
Next, the main control unit 31 instructs the output stop from the audio controller 2a via the
wireless network interface unit 11 and the instruction reception unit 12 until the audio signal
reproduction by the music data reproduction unit 15 is completed (NO in S257) It waits for
receiving (S254). Then, when the instruction receiving unit 12 receives an output stop
instruction to which the ID of the own wireless speaker 1a is given from the audio controller 2a
via the wireless network interface unit 11 (YES in S254), this is sent to the main control unit 31.
hand over. In response to this, the main control unit 31 registers the value of the volume volume
Vol of the music data reproduction unit 15 as resume information (S255), and changes the
volume volume Vol of the music data reproduction unit 15 to a zero value, The output of the
audio signal from the speaker unit 10 is stopped (S256). At this time, the output sound volume
level measurement unit 16 may stop the measurement of the output sound volume level Vout.
[0103]
Thereafter, main controller 31 causes the audio controller 2a to perform a recovery instruction
or a power supply from audio controller 2a via wireless network interface unit 11 and instruction
receiver 12 until the audio signal reproduction by music data reproduction unit 15 is completed
(NO in S262). It waits to receive the OFF instruction (S258, S260).
[0104]
Then, when receiving a recovery instruction to which the ID of its own wireless speaker 1a is
given from the audio controller 2a via the wireless network interface unit 11 (YES in S258), the
instruction accepting unit 12 passes it to the main control unit 31. .
In response to this, the main control unit 31 changes the volume volume Vol of the music data
01-05-2019
29
reproduction unit 15 from the zero value to the value registered as resume information, and
resumes the audio signal output from the speaker unit 10 (S259). When the measurement of the
volume level Vout is stopped while the output of the audio signal output is stopped, the
measurement of the output volume level Vout by the output volume level measurement unit 16
is restarted. After that, it returns to S254.
[0105]
In addition, when the instruction reception unit 12 receives a power-off instruction to which the
ID of its own wireless speaker 1a is given from the audio controller 2a via the wireless network
interface unit 11 (YES in S260), the main control unit 31 receives this. hand over. In response to
this, the main control unit 31 causes the music data reproduction unit 15 to stop the
reproduction of the music data to the audio signal, and then the main power is turned off (S261),
and the present flow ends.
[0106]
Further, when the reproduction of the music data to the audio signal by the music data
reproduction unit 15 is completed (YES in S257 or YES in S262), the main control unit 31 ends
the present flow.
[0107]
Next, the audio controller 2a will be described.
[0108]
FIG. 10 is a schematic functional block diagram of the audio controller 2a.
The functional configuration of the audio controller 2a shown in this figure is, for example, a
CPU, a memory, an auxiliary storage device such as a flash memory, an input / output device
such as a touch panel, a display or a pointing device, and a wireless communication device such
as a wireless LAN adapter In a portable computer such as a smart phone and a tablet PC, each
having a microphone and a microphone, the CPU loads the predetermined program from the
auxiliary storage device onto the memory and executes the program.
01-05-2019
30
[0109]
As illustrated, the audio controller 2a includes a microphone unit 20, a wireless network
interface unit 21, a graphical user interface unit 22, a reproduction instruction transmission unit
23, a recovery instruction transmission unit 24, an input volume level measurement unit 25, and
An output stop instruction transmission unit 40, a power off instruction transmission unit 41, an
output volume level reception unit 42, a room exit determination unit 43, and a main control unit
44 are provided.
Here, components having the same functions as those of the audio controller 2 according to the
first embodiment shown in FIG.
[0110]
The output stop instruction transmission unit 40 broadcasts, from the wireless network interface
unit 21, an output stop instruction accompanied by specification of the ID of the output
destination wireless speaker 1 a of the music data.
[0111]
The power-off instruction transmission unit 41 broadcasts a power-off instruction from the
wireless network interface unit 21 along with the specification of the ID of the output destination
wireless speaker 1 a of the music data.
[0112]
The output volume level receiving unit 42 receives, via the wireless network interface unit 21, an
output volume level notification periodically transmitted from the wireless speaker 1 a.
[0113]
The room judgment unit 43 measures the output sound volume level Vout included in the output
sound volume level notification by the input sound volume level measurement unit 25 every time
the output sound volume level receiver 42 newly receives the output sound volume level
notification. A volume level ratio Vin / Vout indicating the ratio of the latest input volume level
Vin is determined.
01-05-2019
31
Then, based on the change in the volume level ratio Vin / Vout, it is determined whether the
listener carrying the own audio controller 2a has left the room where the music data output
destination wireless speaker 1a is installed.
[0114]
The main control unit 44 centrally controls the units 20 to 25 and 40 to 43 of the audio
controller 2a.
[0115]
FIG. 11 is a flowchart for explaining the operation of the audio controller 2a.
This flow is started by the main control unit 44 receiving from the listener via the graphical user
interface unit 22 a music selection operation involving specification of the music data to be
reproduced and the ID of the output destination wireless speaker 1a of the music data. .
[0116]
First, the main control unit 44 passes the music data to be reproduced and the ID of the output
destination wireless speaker 1 a of the music data to the reproduction instruction transmission
unit 23.
In response to this, the reproduction instruction transmission unit 23 broadcasts a reproduction
instruction including specification of the music data to be reproduced and the ID of the output
destination wireless speaker 1a of the music data from the wireless network interface unit 21
(S350).
[0117]
Next, the main control unit 44 turns on the microphone unit 20 (S351), and waits for an audio
01-05-2019
32
signal to be input to the microphone unit 20 (S352).
When an audio signal is input to the microphone unit 20 (YES in S352), the input volume level
measurement unit 25 is instructed to start measurement. In response to this, the input volume
level measurement unit 25 measures the input volume level Vin which is an average value of the
input volumes of the audio signal input to the microphone unit 20 within the predetermined time
T2 at each predetermined interval T1 (S353) ).
[0118]
Next, when the output volume level receiving unit 42 receives an output volume level notification
(Vout notification) periodically transmitted from the wireless speaker 1 a via the wireless
network interface unit 21 (YES in S354), the output volume is output. The output volume level
Vout included in the level notification is passed to the room exit determination unit 43. In
response to this, the room judgment unit 43 indicates the volume level ratio Vin indicating the
ratio of the latest input volume level Vin measured by the input volume level measurement unit
25 to the output volume level Vout received from the output volume level reception unit 42.
Calculate and store / Vout (S355).
[0119]
Then, the room judgment unit 43 judges whether the volume level ratio Vin / Vout calculated
before the predetermined time T3 (for example, 4 to 6 seconds) is stored (S356). If the volume
level ratio Vin / Vout calculated before the predetermined time T3 is not stored (NO in S356), the
process returns to S354.
[0120]
On the other hand, when the volume level ratio Vin / Vout calculated before the predetermined
time T3 is stored (YES in S356), the room judgment unit 43 determines that the volume level
ratio Vin / Vout calculated before this predetermined time T3. The volume level ratio Vin / Vout
newly calculated this time is compared with the volume level ratio Vin / Vout newly calculated
this time from the volume level ratio Vin / Vout calculated the predetermined time T3 before the
predetermined value P It is judged whether (for example, 5 dB) or more decreased (S357). If the
01-05-2019
33
volume level ratio Vin / Vout newly calculated this time is not lower than the volume level ratio
Vin / Vout calculated before the predetermined time T3 by the predetermined value P or more
(NO in S357), the process returns to S354.
[0121]
On the other hand, if the volume level ratio Vin / Vout newly calculated this time is lower than
the volume level ratio Vin / Vout calculated earlier than the predetermined time T3 by the
predetermined value P or more (YES in S357) The control unit 44 is notified. In response to this,
the main control unit 44 notifies the output stop instruction transmission unit 40 of the ID of the
output destination wireless speaker 1a of the music data. Then, the output stop instruction
transmission unit 40 broadcasts an output stop instruction accompanied by the specification of
the ID of the output destination wireless speaker 1a from the wireless network interface unit 21
(S358). At this time, the input volume level measurement unit 25 may stop the measurement of
the input volume level Vin.
[0122]
After that, the main control unit 44 waits for reception of a recovery operation from the listener
via the graphical user interface unit 22 until timeout occurs after lapse of a predetermined
timeout time T4 (for example, 3 minutes) (NO in S361) S359).
[0123]
When the main control unit 44 receives a recovery operation from the listener via the graphical
user interface unit 22 (YES in S359), the main control unit 44 notifies the recovery instruction
transmission unit 24 of the ID of the output wireless speaker 1a of the music data.
Then, the recovery instruction transmission unit 24 broadcasts a recovery instruction
accompanied by specification of the ID of the output destination wireless speaker 1a from the
wireless network interface unit 21 (S360). When the measurement of the input volume level Vin
is stopped, the input volume level measurement unit 25 resumes the measurement of the input
volume level Vin. Then, it returns to S354.
[0124]
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34
On the other hand, the main control unit 44 does not receive a recovery operation from the
listener (NO in S359), and when a timeout occurs after the timeout time T4 elapses (YES in
S361), instructs the power OFF of the output destination wireless speaker 1a of the music data
The transmission unit 41 is notified. Then, the power-off instruction transmission unit 41
broadcasts a power-off instruction accompanied by designation of the ID of the output
destination wireless speaker 1a from the wireless network interface unit 21 (S362). Then, the
main control unit 44 instructs the input volume level measurement unit 25 to end the
measurement of the input volume level Vin. In response to this, the input volume level
measurement unit 25 ends the measurement of the input volume level Vin (S363). Thereafter,
the main control unit 44 turns off the microphone unit 20 (S364), and ends this flow.
[0125]
Further, when the main control unit 44 receives an end operation of remote control of the
wireless speaker 1a from the listener via the graphical user interface unit 22 (YES in S365), the
main control unit 44 measures the input sound volume level Vin in the input sound volume level
measurement unit 25. Instruct the end. In response to this, the input volume level measurement
unit 25 ends the measurement of the input volume level Vin (S363). Thereafter, the main control
unit 44 turns off the microphone unit 20 (S364), and ends this flow.
[0126]
The second embodiment of the present invention has been described above.
[0127]
Also in this embodiment, as in the first embodiment, the output volume level Vout of the audio
signal output from the speaker unit 10 of the wireless speaker 1a and the audio signal input to
the microphone unit 20 of the audio controller 2a The input volume level Vin is compared, and it
is determined from the volume level ratio Vin / Vout of the two whether the listener carrying the
audio controller 2a has left the room where the wireless speaker 1a is installed.
Then, when it is determined that the listener has left the room, the output of the audio signal
from the wireless speaker 1a is stopped. For this reason, when the listener in the installation
01-05-2019
35
room of the wireless speaker 1a outputting the audio signal leaves the room without stopping the
output of the audio signal, the output of the audio signal can be automatically stopped, which is
useless. The power consumption can be reduced by suppressing the output of the audio signal.
[0128]
Further, in the present embodiment, after transmitting the output stop instruction for stopping
the output of the audio signal to the wireless speaker 1a, the audio controller 2a receives the
recovery operation from the listener before the predetermined time-out time T4 elapses. The
restoration instruction for resuming the output of the audio signal is transmitted to the speaker
1a. On the other hand, if the wireless speaker 1a times out without accepting the recovery
operation from the listener, the wireless speaker 1a stops the reproduction of the music data to
the audio signal and turns off the power to turn off the power Send instructions Therefore, when
the listener carrying the audio controller 2a comes back from the installation room of the
wireless speaker 1a immediately after leaving the room, it is possible to continue to enjoy the
music data with a simple operation, but when not leaving the room. Since the power supply of
the wireless speaker 1a can be automatically cut off, the power consumption of the wireless
speaker 1a can be efficiently reduced.
[0129]
Also in the present embodiment, as in the first embodiment, when the volume level ratio Vin /
Vout decreases by the predetermined value P or more within the predetermined time T3, the
listener carrying the audio controller 2a is the wireless speaker 1a. It is determined that the room
has left the installation room (S163, S171 in FIG. 7, S357 in FIG. 11). However, as described in
the first embodiment, when the listener intentionally lowers the volume of the wireless speaker
1a, it is misjudged that the listener has left the room, depending on the performance of the
microphone unit 20 of the audio controller 2a. there's a possibility that. Therefore, even if the
volume level ratio Vin / Vout decreases by the predetermined value P or more within the
predetermined time T3, if the volume volume is less than the predetermined value, it may be
determined that the listener has left the room.
[0130]
Also in this embodiment, as in the first embodiment, the output volume level Vout of the audio
01-05-2019
36
signal output from the speaker unit 10 of the wireless speaker 1a and the audio signal input to
the microphone unit 20 of the audio controller 2a The input volume level Vin is compared, and it
is determined from the volume level ratio Vin / Vout of the two whether the listener carrying the
audio controller 2a has left the room where the wireless speaker 1a is installed. However, the
present invention is not limited to this. According to the present invention, the audio controller
2a is portable based on the comparison result between the output characteristic of the audio
signal output from the speaker unit 10 of the wireless speaker 1a and the input characteristic of
the audio signal input to the microphone unit 20 of the audio controller 2a. It may be determined
whether or not the listener to be removed has left the periphery of the wireless speaker 1a.
[0131]
For example, in the wireless speaker 1a, an output waveform of an audio signal output from the
speaker unit 10 within a predetermined time T2 is measured at predetermined intervals T1 and
transmitted to the wireless speaker 1a. The input waveform of the audio signal input to the
microphone unit 20 within the predetermined time T2 is measured every T1. Then, the latest
input waveform measured is compared with the latest output waveform received from the
wireless speaker 1a, and based on whether the delay time (phase difference) with respect to the
output waveform of the input waveform is a predetermined time or more. It is determined
whether the listener carrying the audio controller 2a has left the periphery of the wireless
speaker 1a.
[0132]
Further, the present invention is not limited to the above embodiments, and various
modifications are possible within the scope of the invention.
[0133]
For example, in each of the above-described embodiments, the audio controller 2 or 2a
broadcasts various instructions to the wireless speakers 1 or 1a.
However, when the audio controller 2 or 2a recognizes the address of each wireless speaker 1 or
1a, unicast transmission may be performed instead of broadcast transmission.
01-05-2019
37
[0134]
In each of the above-described embodiments, the audio controller 2 or 2a is connected to the
wireless speaker 1 or 1a via the access point 4 and the network 5, but the present invention is
not limited to this. The audio controller 2 and 2a and the wireless speakers 1 and 1a may be
directly connected via a wireless network by short distance wireless communication such as
wireless LAN ad hoc mode and Bluetooth (registered trademark).
[0135]
Moreover, although the media server 3 is connected to the network 5 in each said embodiment,
the media server 3 may be connected to the wireless network. Also, the media server 3 may be
built in the audio controller 2 or 2a or any of the wireless speakers 1 or 1a. When the media
server 3 is built in the audio controller 2 or 2a, the wireless speakers 1 or 1a acquire music data
from the audio controller 2 or 2a. Further, when the media server 3 is built in any of the wireless
speakers 1, 1 a, the other wireless speakers 1, 1 a acquire music data from the wireless speakers
1, 1 a in which the media server 3 is built.
[0136]
1, 1a, 1-1 to 1-3, 1a-1 to 1a-3: wireless speakers, 2, 2a: audio controller, 3: media server, 4:
access point, 5: network, 10: speaker unit, 11 A wireless network interface unit 12: an instruction
reception unit 13: a music data acquisition unit 14: a music data storage unit 15: a music data
reproduction unit 16: an output volume level measurement unit 17: an input volume level
reception unit 18 , 43: Exit judgment unit, 19, 27, 31, 44: Main control unit, 20: Microphone unit,
21: Wireless network interface unit, 22: Graphical user interface unit, 23: Reproduction
instruction transmission unit, 24: Recovery instruction transmission Part 25: Input volume level
measurement part 26: Input volume level notification part 30: Output volume Level notification
unit 40: Output stop instruction transmission unit 41: Power off instruction transmission unit 42:
Output volume level reception unit
01-05-2019
38
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