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JP2014195201

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2014195201
Abstract: To provide a sound control device capable of suppressing power consumption by
adjusting the volume of sound output from a speaker according to the volume of sound output
from a speaker of another sound control device. . A sound control apparatus includes a
microphone, a speaker, and a communication unit that communicates with another sound control
apparatus. The CPU of the sound control device receives sound signals from other sound control
devices via the communication unit (S15). The CPU converts the first sound signal based on a
coefficient specified according to the first sound signal corresponding to the received sound
signal, and generates a reference signal. When the CPU collects the same sound as the sound of
the first sound signal through the microphone, the CPU acquires a second sound signal which is a
signal of the same sound (S11). The CPU converts the first sound signal according to the
comparison result of the volume of the second sound signal and the volume of the reference
signal, and generates an output sound signal (S19). The CPU outputs the sound of the generated
output sound signal via the speaker (S13). [Selected figure] Figure 6
Sound control device
[0001]
The present invention relates to a sound control device capable of performing sound input /
output processing and performing communication by connecting to another sound control
device.
[0002]
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1
While transmitting the signal of the sound collected by the microphone to the other sound
control device installed at the remote place through the network, at the same time, the signal of
the sound of the remote place through the network is received, the sound from the speaker A
sound control device for outputting is known.
Such a sound control device is used in a teleconference system or the like. A speaker phone is an
example of the sound control device. There are known sound control devices capable of
interconnecting and using a plurality of sound control devices in the same place. In such a sound
control device, the audible range of the meeting sound and the sound collection range of the
speech sound can be expanded by interspersing the sound control devices in a wide area.
[0003]
A technique has been proposed for controlling the volume of the sound output from each
speaker of a plurality of sound control devices in the same place. For example, Patent Document
1 discloses a technique for changing the volume of a speaker in accordance with the distance
between a speaker and the speaker. According to this technique, it is possible to make the sum of
the volume of the speaker's voice and the voice output from the speaker constant at any place.
[0004]
JP, 2006-238254, A
[0005]
The case where the user can hear the same sound output from the respective speakers of a
plurality of sound control devices in the same place is taken as an example.
If the user can sufficiently recognize the sound output from one speaker, the sound output from
the other speaker is unnecessary. However, with the technology described in Patent Document 1,
although the sum of the volume of the voice of the speaker and the sound output from the
speaker can be made constant, the sum of the volume of the sound output from each of the
plurality of speakers Can not be constant. Therefore, the sound control device may output a
sound to the user even though the user can sufficiently recognize the sound output from the
speaker of the other sound control device. In the case where the user can sufficiently recognize
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2
the sound output from the speaker of another sound control device, the sound control device is
preferable because the current consumption can be suppressed if the volume of the sound output
from the speaker can be reduced.
[0006]
An object of the present invention is to provide a sound control device capable of suppressing
power consumption by adjusting the volume of sound output from a speaker according to the
volume of sound output from a speaker of another sound control device. It is to provide.
[0007]
A sound control device according to the present invention is a sound control device provided
with a microphone, a speaker, and a communication unit for communicating with another sound
control device, the sound signal being a signal indicating sound, the communication unit
Receiving means for receiving from the other sound control apparatus via the first sound signal,
and corresponding to the first sound signal based on a coefficient specified according to the first
sound signal corresponding to the sound signal received by the receiving means When the same
sound as the sound indicated by the first sound signal is collected through the first generation
means for generating a reference signal and the microphone, the second sound signal which is
the signal of the same sound is acquired A comparison result of the first acquisition means, the
volume of the sound indicated by the second sound signal acquired by the first acquisition
means, and the volume of the sound indicated by the reference signal generated by the first
generation means Convert the first sound signal according to the output sound signal A second
generating means for generating, and outputting means based on the output sound signal
generated by said second generating means, and outputs a sound represented by the output
sound signal through the speaker.
[0008]
According to the present invention, the sound control device changes the volume of the sound of
the first sound signal corresponding to the sound signal received from the other sound control
device according to the volume of the sound received through the microphone, and outputs
Generate a sound signal.
For example, when the sound control device outputs the same sound as the sound indicated by
the first sound signal from the speaker of another sound control device and receives this sound
through the microphone at a sufficient volume, the first sound signal is Based on that, the volume
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3
of the output sound output from the speaker can be reduced.
For example, when the same sound as the sound indicated by the first sound signal is output
from the speaker of another sound control device and this sound is received through the
microphone at a small volume, the sound is output from the speaker based on the first sound
signal Can increase the volume of the sound. Thus, the sound control device can adjust the
volume of the output sound output from the speaker according to the volume of the sound
output from the speaker of the other sound control device. Therefore, the sound control device
can suppress the consumption current accompanying the output sound output from the speaker
by suppressing the volume of the output sound output from the speaker. Further, the sound
control device can set the sound volume of the sound at the position of the sound control device
to a predetermined level by adjusting the volume of the output sound output from the speaker.
[0009]
In the present invention, when the volume of the sound indicated by the reference signal is equal
to or higher than the volume of the sound indicated by the second sound signal, the second
generation means sets the volume of the sound indicated by the second sound signal. The output
sound signal may be generated by changing the volume of the first sound signal based on a
coefficient for increasing the level to a level approximating the volume of the sound indicated by
the reference signal. Thus, the sound control device can adjust the sound volume of the sound
output from the speaker so that the sound volume of the sound at the position of the sound
control device approximates a predetermined level, so the current consumption accompanying
the sound output from the speaker It can be efficiently suppressed.
[0010]
In the present invention, when the volume of the sound indicated by the reference signal is equal
to or higher than the volume of the sound indicated by the second sound signal, the second
generation means sets the volume of the sound indicated by the second sound signal. The output
sound signal may be generated by changing the volume of the first sound signal based on a
coefficient for increasing the level to the level of the sound indicated by the reference signal.
Thus, the sound control device can adjust the sound volume of the sound output from the
speaker so that the sound volume of the sound at the position of the sound control device
matches the predetermined level, so the current consumption accompanying the sound output
from the speaker can be reduced. Further, it can be suppressed efficiently.
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[0011]
In the present invention, the output means may not output the sound through the speaker when
the volume of the sound indicated by the reference signal is less than the volume of the sound
indicated by the second sound signal. Thus, the sound control device can minimize the current
consumption involved in outputting the sound from the speaker.
[0012]
In the present invention, a second acquisition unit for acquiring a set value of the volume of
sound output from the speaker is provided, and the first generation unit is specified according to
the set value acquired by the second acquisition unit. The reference signal corresponding to the
first sound signal may be generated based on the coefficient. Thus, the sound control device can
generate a reference signal in accordance with the set value of the sound volume and use it for
comparison with the second sound signal. Thus, the sound control device can adjust the sound
volume of the sound output from the speaker so that the sound volume of the sound at the
position of the sound control device becomes the level specified by the setting value, and can
output the sound from the speaker.
[0013]
In the present invention, a third acquisition unit for acquiring a voltage of a battery for driving
the sound control device is provided, and the first generation unit is configured to generate the
first sound based on the voltage acquired by the third acquisition unit. The reference signal
corresponding to the signal may be generated. Thereby, the sound control device can further
suppress the volume of the sound output from the speaker when the voltage of the battery is
lowered. As described above, the sound control device can increase the driving time of the sound
control device by the battery by suppressing the power consumption of the speaker according to
the voltage of the battery.
[0014]
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5
FIG. 1 is a diagram showing an overview of a sound control system 1; FIG. 6 is a view showing
how a sound output from the sound control device 21 is transmitted to the sound control device
22. FIG. 2 is a block diagram showing an electrical configuration of a sound control device 20. It
is a block diagram which shows the flow of the signal of the sound control apparatus 22. FIG. It is
a figure showing the 1st graph 541, the 2nd graph 542, and the 3rd graph 543. It is a flowchart
of an output process. It is a flowchart of coefficient determination processing. It is a flowchart of
a coefficient change process. It is a block diagram which shows the flow of the signal of the
sound control apparatus 22 in a modification. It is a figure which shows the 2nd graph 544 in a
modification.
[0015]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. The outline of the sound control system 1 will be described with reference to FIG. The
sound control system 1 includes personal computers (PCs) 11 and 12 (hereinafter collectively
referred to as “PC 13”), and sound control devices 21 to 24 (hereinafter collectively referred
to as “sound control device 20”). . ). The PC 11 and the sound control devices 21 and 22 are at
the same place (hereinafter referred to as “first place 3”. Installed in The PC 12 and the sound
control devices 23 and 24 are installed at a second place 4 different from the first place 3. Users
31 to 34 are arranged near the sound control devices 21 to 24 respectively. Hereinafter, the
users 31 to 34 are collectively referred to as “user 30”.
[0016]
The sound control device 21 connects to the PC 11 via the Universal Serial Bus (USB (registered
trademark)). The sound control device 22 is connected to the sound control device 21 via the
USB. The sound control device 23 is connected to the PC 12 via the USB. The sound control
device 24 is connected to the sound control device 23 via the USB. The sound control device 20
is driven by the power supplied via the USB. The sound control device 20 includes a battery 60
and can be driven by the battery 60 as well. The sound control device 20 is driven by the battery
60 when the power is not supplied via the USB. For example, the sound control devices 21 and
23 are driven by the battery 60 when connected to the PC 13 which can not supply power via
the USB. Further, for example, when connected to the sound control devices 21 and 23 driven by
the battery 60, the sound control devices 22 and 24 are driven by the battery 60.
[0017]
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6
The PCs 11 and 12 connect to the Internet 2 respectively. The PCs 11 and 12 can communicate
via the Internet network 2 respectively. The connection method between the sound control
devices 21 and 23 and the PCs 11 and 12 and the connection method between the sound control
devices 21 and 23 and the sound control devices 22 and 24 may be other than USB. Good. For
example, it may be connected by wireless (Bluetooth (registered trademark), wireless LAN, etc.) of
any communication method.
[0018]
Each of the sound control devices 21 to 24 collects a sound via the microphone 57 (see FIG. 3).
The sound control device 22 is a signal of collected sound (hereinafter referred to as "sound
signal". ) To the sound control device 21. The sound signal indicates a plurality of discrete values
obtained by quantizing the sound waveform. The sound control device 21 receives a sound signal
from the sound control device 22. The sound control device 21 superimposes the sound signal of
the sound collected via the microphone 57 of the sound control device 21 on the sound signal
received from the sound control device 22. The sound control device 21 transmits the
superimposed sound signal to the sound control device 23 via the PC 11, the Internet 2, and the
PC 12. The sound control device 23 transmits the received sound signal to the sound control
device 24. The sound control devices 23 and 24 respectively output the sound of the waveform
reproduced based on the sound signal from the speaker 58 (see FIG. 3). As a result, the users 33
and 34 can hear the sounds of the users 31 and 32 and the sounds in the first place 3.
Hereinafter, the sound of the waveform reproduced based on the sound signal is simply referred
to as "the sound indicated by the sound signal".
[0019]
Further, the sound control device 24 transmits a sound signal of the sound collected through the
microphone 57 to the sound control device 23 through the USB. The sound control device 23
receives a sound signal from the sound control device 24 and superimposes the sound signal of
the sound collected via the microphone 57 on the received sound signal. The sound control
device 23 transmits the superimposed sound signal to the sound control device 21 via the PC 12,
the Internet 2, and the PC 11. The sound control device 21 transmits the received sound signal to
the sound control device 22. The sound control devices 21 and 22 respectively output the sound
indicated by the sound signal from the speaker 58. As a result, the users 31 and 32 can hear the
sounds of the users 33 and 34 and the sounds in the second place 4.
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[0020]
As described above, in the sound control system 1, the sound signals are transmitted and
received between the sound control devices 20 installed in the first place 3 and the second place
4, respectively. It is a system capable of holding an audio conference between them. In the sound
control system 1, a plurality of sound control devices 20 can be interspersed in a wide area. As a
result, the sound output from the speaker 58 of the sound control device 20 can be heard over a
wide area. Further, the microphone 57 of the sound control device 20 can collect sound in a wide
area.
[0021]
The sound control devices 21 and 22 at the first place 3 respectively output from the speaker 58
the same sound indicated by the same sound signal transmitted from the sound control device 23
at the second place 4. Therefore, for example, when the sound control devices 21 and 22 are
installed close to each other, the volume of the sound at the position of the sound control device
22 is output from the speaker 58 of the sound control device 21 and transmitted to the sound
control device 22. This is the volume of the sound superimposed on the sound and the sound
output from the speaker 58 of the sound control device 22.
[0022]
For example, when the volume of the sound output from the speaker 58 of the sound control
device 21 and transmitted to the sound control device 22 is large, the sound control device 22
generates the sound volume at the position of the sound control device 22 at a predetermined
level. The volume of the sound to be output may be small. Therefore, when the sound control
device 22 receives the sound output from the speaker 58 of the sound control device 21 via the
microphone 57 at a large volume, the sound control device 22 can reduce the volume of the
sound output from the speaker 58. Also, when the volume of the sound output from the speaker
58 of the sound control device 21 and transmitted to the sound control device 22 becomes equal
to or higher than a predetermined level, the sound control device 22 does not output the sound
from the speaker 58. The volume of the sound at the position of is higher than a predetermined
level. Therefore, in the above case, if it is possible to reduce the volume of the sound output from
the speaker 58 or not to output the sound, the sound control device 22 associated with the
09-05-2019
8
output of the sound from the speaker 58 It is preferable because power consumption can be
suppressed.
[0023]
Therefore, the CPU 51 of the sound control device 22 receives the sound output from the
speaker 58 of the sound control device 21 through the microphone 57, and outputs the same
sound from the speaker 58 based on the volume of the received sound. Adjust the volume.
[0024]
Specifically, it is as shown in FIG.
The sound control device 22 collects the sound output from the speaker 58 of the sound control
device 21 through the microphone 57. Further, the sound control device 22 receives a sound
signal of the same sound as the sound collected through the microphone 57 from the sound
control device 21 through the USB.
[0025]
As shown in FIG. 2A, when the volume of the collected sound is small, the sound control device
22 is a sound signal received via USB in order to set the volume of the sound at the position of
the sound control device 22 to a predetermined level. The indicated sound is output from the
speaker 58 at a large volume. Further, as shown in FIG. 2B, when the volume of the collected
sound is large, the sound control device 22 receives the sound signal received via USB in order to
set the sound volume of the sound at the position of the sound control device 22 to a
predetermined level. The sound indicated by is output from the speaker 58 at a small volume.
Further, as shown in FIG. 2C, when the volume of the collected sound is higher and the volume of
the sound at the position of the sound control device 22 is equal to or higher than a
predetermined level, the sound control device 22 received via USB. The sound indicated by the
sound signal is not output from the speaker 58.
[0026]
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9
By performing the control as described above, the sound control device 22 can adjust the volume
of the sound output from the speaker 58 as needed. Therefore, the power consumption of the
sound control device 22 accompanying the output of the sound from the speaker 58 Can be
suppressed. Further, by performing the control as described above, it is also possible to transmit
a sound of a sufficient volume to the user 32 in the vicinity of the sound control device 22.
[0027]
In the present embodiment, it is assumed that only the sound control devices 22 and 24 perform
the sound volume control described above. The sound control device 21 directly connected to the
PC 11 and the sound control device 23 directly connected to the PC 12 do not perform the
above-described volume control.
[0028]
The configuration of the sound control system 1 can be changed to a configuration other than
that shown in FIG. For example, the sound control devices 21 and 22 may be directly connected
to the Internet 2. The sound control devices 21, 22 may communicate directly with each other
via the Internet network 2. Further sound control devices may be connected to the sound control
devices 22 and 24 via USB. Each of the sound control devices 21 and 22 may be directly
connected to the PC 11, and each of the sound control devices 23 and 24 may be directly
connected to the PC 12. Between the PC 11 and the sound control device 21, between the sound
control devices 21 and 22, between the PC 12 and the sound control device 23, and between the
sound control devices 23 and 24, they may be connected by a LAN cable, or wireless (For
example, it may be connected by wireless LAN or Bluetooth (registered trademark)). The abovedescribed volume control may be performed by all of the sound control devices 21-24.
[0029]
The electrical configuration of the sound control device 20 will be described with reference to
FIG. The sound control device 20 includes a CPU 51. The CPU 51 is electrically connected to the
ROM 52, the RAM 53, the flash memory 54, the USB I / F 55, the operation unit 56, the A / D
converter 68, the D / A converter 65, and the battery drive circuit 59. The A / D converter 68 is
electrically connected to the microphone 57 through an analog amplification circuit (such as a
microphone amplifier) not shown, and the D / A converter 65 is connected through an analog
09-05-2019
10
amplification circuit (such as a speaker amplifier) not shown. And electrically connect with the
speaker 58. The battery drive circuit 59 is connected to the battery 60.
[0030]
The ROM 52 stores a boot program, a BIOS, an OS, and the like. The RAM 53 stores a timer, a
counter, and temporary data. The flash memory 54 stores the program of the CPU 51. Further,
the flash memory 54 stores information indicating a first graph 541 (see FIG. 5), a second graph
542 (see FIG. 5), and a third graph 543 (see FIG. 5). The USB I / F 55 is an interface element for
performing communication via USB. The operation unit 56 is a push button capable of
performing an input operation. The operation unit 56 includes a volume button for setting the
volume of the sound output from the speaker 58 to the sound control device 20. The battery
drive circuit 59 is a circuit that monitors the voltage of the battery 60.
[0031]
The flow of signals in the sound control device 22 will be described with reference to FIG. The
CPU 51 receives the sound signal Kc from the sound control device 21 via the USB I / F 55. The
CPU 51 decodes and combines the received sound signal Kc, and the like to generate a first
sound signal K1 (data receiving unit 61). When the CPU 51 receives an operation of setting the
volume of the speaker via the volume button of the operation unit 56, the value of the set volume
(hereinafter referred to as "set value Vc"). ) (State determination unit 70). The CPU 51 obtains the
voltage Vb of the battery 60 via the battery drive circuit 59 (state determination unit 70).
[0032]
The CPU 51 generates a reference signal Kr obtained by converting the first sound signal K1
(reference signal generation unit 62). The reference signal Kr is a first sound signal based on the
relationship between the output sound and the collected sound when the sound control device
22 directly collects the sound output from the speaker 58 through the microphone 57. It is a
signal obtained by converting K1. That is, the reference signal Kr indicates a sound signal of a
sound assumed to be collected through the microphone 57 when the sound indicated by the first
sound signal K1 is output from the speaker 58. The CPU 51 refers to information indicating the
first graph 541 (see FIG. 5) and the second graph 542 (see FIG. 5) stored in the flash memory 54.
The CPU 51 generates the reference signal Kr based on the relationship between the set value Vc
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11
specified by the information to be referred to, the volume V (Ki), and the reference coefficient P.
[0033]
In the present embodiment, the first graph 541 and the second graph 542 are illustrated to
facilitate the explanation, but in the present invention, the reference signal Kr may be generated
based on other information. For example, the reference signal Kr may be generated by applying
the relational expressions shown by the first graph 541 and the second graph 542, or the
reference signal Kr is generated by applying a lookup table of discrete values. It is also good.
[0034]
As shown in FIG. 5A, a first graph 541 shows the relationship between an arbitrary set value Vc
and a volume V (Ki) (described later). The first graph 541 is determined as follows. While the
volume is at the specific setting value Vc, the speaker 58 outputs an arbitrary sound. At the same
time, the microphone 57 collects the sound output from the speaker 58. The relationship
between the volume V (Ki) of the collected sound and the specific setting value Vc is specified.
The above processing is repeatedly executed while changing the volume of the sound output
from the speaker 58. A first graph 541 including a curve 541A indicating the specified
relationship is stored in the flash memory 54. Therefore, the curve 541A indicates the
relationship between the volume of the output sound and the volume of the collected sound
when the sound control device 22 directly collects the sound output from the speaker 58
through the microphone 57. . In addition, a curve 541B having a large slope with respect to the
curve 541A and a curve 541C having a small slope are included in the first graph 541. As shown
in FIG. 5B, the second graph 542 shows the relationship between the volume V (Ki) and the
reference coefficient P. The second graph 542 includes curves 542A, 542B, 542C. Curves 542A,
542B, 542C correspond to the curves 541A, 541B, 541C of the first graph 541, respectively.
[0035]
The first graph 541 and the second graph 542 are determined by executing the above
determination method before using the sound control device 22, and information indicating each
is stored in the flash memory 54. Thereafter, when the CPU 51 receives the sound signal Kc from
the sound control device 21 through the USB I / F 55, it applies the first graph 541 and the
second graph 542 stored in the flash memory 54 as described later. The reference coefficient P
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is specified by.
[0036]
When the first sound signal K1 is generated based on the sound signal Kc received via the USB I
/ F 55, the CPU 51 first acquires the setting value Vc of the volume of the speaker 58. The CPU
51 specifies the volume V (Ki) corresponding to the setting value Vc by applying the acquired
setting value Vc to any of the curves 541A, 541B, 541C of the first graph 541. Next, the CPU 51
applies one of the curves 542A, 542B, and 542C of the second graph 542 to specify the
reference coefficient P corresponding to the specified volume V (Ki).
[0037]
The Y axis of the first graph 541 and the X axis of the second graph 542 both indicate the
volume V (Ki). Therefore, it is possible to directly specify the reference coefficient P based on the
set value Vc by storing information indicating the correspondence between the set value Vc and
the reference coefficient P in the flash memory 54 and applying it. is there. However, in the
present embodiment, two graphs (a first graph 541 and a second graph 542) are used to specify
the reference coefficient P based on the set value Vc. The reason is that the method for obtaining
each graph is different. That is, in the first graph 541, the relationship between the setting value
Vc and the volume V (Ki) is obtained by using a sound signal (white noise or the like) having a
frequency wider than the voice band. On the other hand, in the second graph 542, the
relationship between the volume V (Ki) and the reference coefficient P is determined by using a
sound signal having a frequency equal to that of the voice band. Thus, two graphs are used to
facilitate the correction process for both separately.
[0038]
Note that which one of the curves 541A, 541B and 541C of the first graph 541 and the curves
542A, 542B and 542C of the second graph 542 is applied is based on the voltage Vb of the
battery acquired by the state determination unit 70. Is determined. Specifically, it is as follows. If
the battery voltage Vb is larger than a predetermined first threshold, it is determined that the
remaining capacity of the battery is high. In this case, there is no problem if the speaker 58
outputs a sound at a large volume. Therefore, the CPU 51 applies the curve 541B of the first
graph 541 and the curve 542B of the second graph 542 so that the specified reference
09-05-2019
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coefficient P is larger. Further, when the voltage Vb of the battery is less than a predetermined
second threshold smaller than the first threshold, it is determined that the remaining capacity of
the battery is small. In this case, power consumption needs to be suppressed by reducing the
volume of the sound output from the speaker 58. Therefore, the CPU 51 applies the curve 541C
of the first graph 541 and the curve 542C of the second graph 542 so that the specified
reference coefficient P is smaller. When the battery voltage Vb is equal to or greater than the
second threshold and equal to or less than the first threshold, the CPU 51 applies the curve 541A
of the first graph 541 and the curve 542A of the second graph 542.
[0039]
In the above, when the sound control device 20 is driven by the power supplied via the USB, the
state determination unit 70 may acquire the voltage of the power supplied via the USB as the
voltage Vb. In this case, since the acquired voltage Vb is always equal to or more than the second
threshold and equal to or less than the first threshold, the curve 541A of the first graph 541 and
the curve 542A of the second graph 542 are applied.
[0040]
Finally, the CPU 51 generates a reference signal Kr by multiplying the first sound signal K1 by
the specified reference coefficient P (see Equation 1). Kr = P × K1 (Equation 1) As shown in FIG.
2D, the calculated reference signal Kr is assumed when the sound indicated by the first sound
signal K1 is output from the speaker 58 at the volume of the setting value Vc. Corresponds to the
sound signal of the collected sound.
[0041]
When the remote conference is started, the CPU 51 collects the sound through the microphone
57. The collected sound includes, for example, the voice uttered by the user 32. In addition, when
a sound is output from the speaker 58 of the sound control device 21, this sound is also included
in the collected sound. Further, when the sound control device 21 transmits a sound signal, the
CPU 51 receives the sound signal Kc via the USB I / F 55 and generates a first sound signal K1.
The sound indicated by the first sound signal K1 is the same as the sound output from the
speaker 58 of the sound control device 21.
09-05-2019
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[0042]
The collected sound is amplified by an analog amplification circuit (not shown) and then digitized
by an A / D converter 68 to generate a sound signal. The CPU 51 generates a sound signal (for
example, the voice of the user 32) excluding the same sound as the sound indicated by the first
sound signal K1 (that is, the sound output from the speaker 58 of the sound control device 21)
among the generated sound signals. K j is extracted using a known echo cancellation technique
(input control unit 69). The CPU 51 performs encoding and packetization of the extracted sound
signal to generate a sound signal Kc (data receiving unit 67). The CPU 51 transmits the
generated sound signal Kc to the sound control device 21 via the USB I / F 55.
[0043]
Further, the CPU 51 extracts a sound signal of the same sound as the sound indicated by the first
sound signal K1 among the generated sound signals as the second sound signal K2 using the
well-known echo cancellation technology in the input control unit 69. . The CPU 51 compares the
volume V (Kr) of the sound indicated by the reference signal Kr with the volume V (K2) of the
sound indicated by the second sound signal K2 (signal comparison unit 63). As shown in FIGS. 2A
and 2B, when the volume V (K2) is smaller than the volume V (Kr), that is, when the volume V
(Kr) is equal to or higher than the volume V (K2), the sound control device 22 The volume of the
sound indicated by the first sound signal K1 is adjusted, and the sound is output from the
speaker 58.
[0044]
The adjustment of the volume is performed as follows based on the adjustment coefficient Q
specified by referring to the information indicating the third graph 543 (see FIG. 5) stored in the
flash memory 54. As shown in FIG. 5C, the third graph 543 shows a plurality of curves 543A
representing the relationship between the difference V (Kr) −V (K2) between the volume V (Kr)
and the volume V (K2) and the adjustment factor q. Includes 543B, 543C. The adjustment factor
q is set to the volume V (K2) in order to increase the volume V (K2) of the sound indicated by the
second sound signal K2 to a level coincident with the volume V (Kr) of the sound indicated by the
reference signal Kr. Indicates the multiplier to multiply. The relationship of Equation 2 below is
established between the volume V (Kr) and the volume V (K2). V (Kr) = q × V (K2) (Equation 2)
09-05-2019
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[0045]
The third graph 543 shows the difference V (Kr) -V (K2) and the multiplier (adjustment factor q)
by which the volume V (K2) is multiplied to increase the volume V (K2) to the volume V (Kr). It
shows the relationship. The larger the difference V (Kr) -V (K2), the larger the multiplier for
increasing the volume V (K2) to the volume V (Kr), and hence the adjustment factor q becomes
larger. The CPU 51 determines an adjustment coefficient q corresponding to the difference V (Kr)
-V (K2) by applying one of the curves 543A to 543C of the third graph 543.
[0046]
The adjustment factor Q is an average of a plurality of adjustment factors q. The CPU 51
calculates the adjustment factor Q based on the plurality of adjustment factors q. The CPU 51
generates an output sound signal Ko which is a signal of sound output from the speaker 58 by
multiplying the first sound signal K1 by the calculated adjustment factor Q (output control unit
64, see equation 3). Ko = Q × K1 (Equation 3)
[0047]
Note that which one of the curves 543A to 543C of the third graph 543 is to be applied is
determined based on the setting value Vc acquired by the state determination unit 70.
Specifically, it is as follows. For example, when the acquired setting value Vc is larger than the
current setting value of the volume, an input operation to increase the volume is performed.
Therefore, the CPU 51 applies a curve 543B in which a larger adjustment factor q is specified for
any difference V (Kr) -V (K2). In addition, when the acquired setting value Vc is smaller than the
current setting value of the sound volume, an input operation for reducing the sound volume is
performed. Therefore, the CPU 51 applies a curve 543C in which a smaller adjustment factor q is
specified for any difference V (Kr) -V (K2). If the acquired setting value Vc is the same as the
setting value of the sound volume at the present time, the CPU 51 applies the curve 543B.
[0048]
Note that which one of the curves 543A to 543C of the third graph 543 is to be applied may be
09-05-2019
16
determined based on the voltage Vb of the battery acquired by the state determination unit 70.
Specifically, it is as follows. If the battery voltage Vb is greater than the first threshold, the CPU
51 applies the curve 543B. When the battery voltage Vb is less than the second threshold, the
CPU 51 applies the curve 543C. When the battery voltage Vb is equal to or greater than the
second threshold and equal to or less than the first threshold, the CPU 51 applies the curve
543B.
[0049]
The CPU 51 outputs the output sound signal Ko to the D / A converter 65. The D / A converter
65 analogizes the output sound signal Ko. The analogized output sound signal Ko is amplified by
an analog amplification circuit (not shown). The speaker 58 outputs a sound indicated by the
amplified output sound signal Ko.
[0050]
On the other hand, as shown in FIG. 2C, when the volume V (K2) is equal to or higher than the
volume V (Kr), that is, when the volume V (Kr) is less than the volume V (Kr), the CPU 51 sets 0
as the adjustment coefficient. Identify Since the output sound signal Ko generated based on the
specified adjustment coefficient Q is 0, the sound indicated by the first sound signal K1 is not
output from the speaker 58 of the sound control device 22.
[0051]
The information indicating the third graph 543 is simultaneously determined when the first grab
541 and the second graph 542 are determined before the use of the sound control device 22,
and the information is flashed together with the first graph 541 and the second graph 542 It is
stored in the memory 54.
[0052]
The process executed by the CPU 51 of the sound control device 22 will be described with
reference to FIGS. 6 to 8.
09-05-2019
17
When the power of the sound control device 22 is turned on, the CPU 51 reads out and executes
the program stored in the flash memory 54 to perform output processing (see FIG. 6) and
coefficient determination processing (see FIG. 7). Run. The output process and the coefficient
determination process are performed in parallel.
[0053]
The output processing will be described with reference to FIG. When the output process is
started, the microphone 57 starts sound collection. The A / D converter 68 digitizes the collected
sound and starts processing to generate a sound signal. The CPU 51 starts processing of
acquiring, as the second sound signal K2, a sound signal having the same sound as the sound
indicated by the first sound signal generated in S17 described later among the generated sound
signals (S11). The CPU 51 stores the acquired second sound signal K2 in the RAM 53. The CPU
51 starts the process of reading out the output sound signal Ko stored in the RAM 53 in S19
described later and outputting it to the D / A converter 65 (S13). As a result, the D / A converter
65 analogizes the output sound signal Ko, and the speaker 58 outputs a sound indicated by the
output sound signal Ko.
[0054]
The CPU 51 receives the sound signal Kc transmitted from the sound control device 21 via the
USB I / F 55 (S15). The CPU 51 decodes and combines the received sound signal Kc, and
generates the first sound signal K1 (S17). The CPU 51 stores the generated first sound signal K1
in the RAM 53 in association with the second sound signal K2 acquired in S11, which is a sound
signal indicating the same sound as the sound indicated by the first sound signal K1.
[0055]
The CPU 51 multiplies the first sound signal K1 generated in S17 and stored in the RAM 53 by
the adjustment coefficient Q determined by the coefficient determination process (see FIG. 7)
described later to generate the output sound signal Ko (S19) . The CPU 51 stores the generated
output sound signal Ko in the RAM 53. The output sound signal Ko stored in the RAM 53 is read
out and output to the D / A converter 65 based on the process started in S13. The sound
indicated by the output sound signal Ko is output from the speaker 58. The CPU 51 returns the
process to S15.
09-05-2019
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[0056]
The coefficient determination process will be described with reference to FIG. The CPU 51
obtains the first sound signal K1 generated in S17 and stored in the RAM 53 (S21). The CPU 51
executes coefficient change processing (see FIG. 8) (S22). In the coefficient changing process,
which one of the curves 541A to 541C included in the first graph 541 and the curves 542A to
542C included in the second graph 542 is to be applied is selected.
[0057]
The coefficient changing process will be described with reference to FIG. The CPU 51 acquires
the battery voltage Vb (S51). The CPU 51 selects any one of the curves 541A to 541C included in
the first graph 541 and the curves 542A to 542C included in the second graph 542 based on the
acquired voltage Vb of the battery (S53). Note that any of the selected curves 541A to 541C and
any of the curves 542A to 542C are applied when the reference coefficient P is determined in
S25 (see FIG. 7).
[0058]
The CPU 51 acquires the set value Vc of the volume (S55). The CPU 51 selects one of the curves
543A to 543C included in the third graph 543 based on the acquired setting value Vc (S57). Note
that any one of the selected curves 543A to 543C is applied when the adjustment coefficient q is
determined in S33 (see FIG. 7). The CPU 51 ends the coefficient change process, and returns the
process to the coefficient determination process (see FIG. 7).
[0059]
As shown in FIG. 7, after completion of the coefficient determination process (S22), the CPU 51
specifies the volume V (K1) of the sound indicated by the first sound signal K1 acquired in S21
(S23). The CPU 51 selects one of the curves 541A to 541C selected in the coefficient changing
process (S22) of the first graph 541 and the coefficient changing process (S22) of the second
graph 542 (see FIG. 5). The reference coefficient P is determined based on any of the curves
09-05-2019
19
542A to 542C (S25). The CPU 51 multiplies the first sound signal K1 by the determined
reference coefficient P to generate a reference signal Kr (S27).
[0060]
The CPU 51 acquires, from the RAM 53, a second sound signal K2 indicating the same sound as
the sound indicated by the first sound signal K1 that is the source of the generated reference
signal Kr. The CPU 51 calculates the difference between the volume V (Kr) of the sound indicated
by the reference signal Kr generated in S27 and the volume V (K2) of the sound indicated by the
acquired second sound signal K2 (S29). When the CPU 51 determines that the difference is 0 or
more (S31: YES), the CPU 51 determines the adjustment coefficient q based on the third graph
543 (see FIG. 5) (S33). Note that which of the curves 543A to 543C included in the third graph
543 is to be applied is determined by executing the coefficient changing process (see FIG. 8) in
S22. The CPU 51 stores the determined adjustment coefficient q in the RAM 53 in association
with the determined time (S37).
[0061]
When S37 is repeated, a plurality of adjustment coefficients q are stored in the RAM 53. The CPU
51 acquires a plurality of adjustment coefficients q determined within a predetermined time from
the current time among the plurality of adjustment coefficients q stored in the RAM 53 based on
the associated time (S39). The CPU 51 calculates the average of the acquired adjustment factor q,
and determines it as the adjustment factor Q (S41). The CPU 51 returns the process to S29. The
CPU 51 generates the output sound signal Ko by multiplying the first sound signal K1 by the
adjustment coefficient Q determined in S19 (see FIG. 6). The CPU 51 outputs the output sound
signal Ko to the D / A converter 65 in S13 (see FIG. 6), whereby the sound indicated by the
output sound signal Ko is output from the speaker 58.
[0062]
On the other hand, when determining that the difference calculated in S29 is less than 0 (S31:
NO), the CPU 51 determines the adjustment coefficient Q to be 0 (S35). The CPU 51 returns the
process to S29. The CPU 51 generates the output sound signal Ko by multiplying the first sound
signal K1 by the adjustment coefficient Q determined in S19 (see FIG. 6). By setting the
adjustment coefficient Q to 0, the output sound signal Ko generated in S19 (see FIG. 6) also
09-05-2019
20
becomes 0. Therefore, even if the output sound signal Ko is output to the D / A converter 65 in
S13 (see FIG. 6), no sound is output from the speaker 58.
[0063]
As described above, the sound control device 22 receives the sound output from the speaker 58
of the sound control device 21 through the microphone 57, and acquires the second sound signal
K2 (S11). The sound control device 22 receives the sound signal Kc from the sound control
device 21 via the USB, and acquires the first sound signal K1 (S17). The sound control device can
change the sound volume V (K1) of the sound indicated by the first sound signal K1 based on the
sound volume V (K2) of the second sound signal K2 and output it from the speaker 58 (S13) .
[0064]
The sound control device 22 determines the adjustment coefficient Q according to the difference
between the sound volume V (Kr) and the sound volume V (K2) of the sound indicated by the
reference signal Kr (S41), and multiplies the first sound signal K1. Thus, the output sound signal
Ko of the sound output from the speaker 58 is generated (S19). When the volume V (K2) of the
second sound signal K2 received and acquired via the microphone 57 is small, the sound control
device 22 applies a large adjustment factor Q to the first sound signal K1 to generate an output
sound signal Ko. By doing this, the volume of the sound output from the speaker 58 can be
increased. As a result, the sound control device 22 can transmit to the user 31 a sound of a
volume that can be recognized by the user 31. On the other hand, when the volume V (K2) of the
second sound signal K2 received and acquired through the microphone 57 is large, a small
adjustment coefficient Q is applied to the first sound signal K1 to generate the output sound
signal Ko. The volume of the sound output from the speaker 58 can be reduced. Thereby, the
sound control device 22 can maintain the volume of the sound at the position of the sound
control device 22 at a predetermined level, and can suppress the power consumption
accompanying the output of the sound from the speaker 58.
[0065]
Further, the sound control device 22 generates the reference signal Kr by multiplying the first
sound signal K1 by the reference coefficient P (S27), and the volume V (Kr) of the sound
indicated by the generated reference signal Kr If it is equal to or higher than the volume V (K2) of
09-05-2019
21
the sound indicated by the two-tone signal K2, the adjustment coefficient Q is determined. The
reference signal Kr indicates a sound signal of a sound assumed to be collected through the
microphone 57 when the sound indicated by the first sound signal K1 is output from the speaker
58 (see FIG. 12D). Therefore, the sound control device 22 can determine the reference signal Kr
as an appropriate reference for determining the adjustment factor Q, and can determine the
adjustment factor Q, so that the volume of the sound output from the speaker 58 is adjusted to
an appropriate level. it can. Therefore, the sound control device 22 can efficiently suppress the
current consumption accompanying the output of the sound from the speaker 58.
[0066]
The sound control device 22 generates the reference signal Kr in accordance with the set value
Vc of the sound volume, and can be used to compare the second sound signal K2 with the sound
volume V (K2). A reference signal Kr can be generated. Therefore, the sound control device 22
can generate an output signal Ko of an appropriate volume according to the setting value Vc of
the volume.
[0067]
In addition, when the volume V (Kr) is less than the volume V (K2) (S31: NO), the sound control
device 22 sets the adjustment coefficient Q to 0 (S35), and does not output the sound from the
speaker 58. As a result, the sound control device 22 can minimize the current consumption
involved in outputting the sound from the speaker.
[0068]
Further, the sound control device 22 acquires the voltage Vb of the battery (S51), and the
reference coefficient P is selected among the curves 541A to 541C of the first graph 541 and the
curves 542A to 542C of the second graph 542 according to the voltage Vb. A curve to be applied
for determination is selected (S53). Therefore, the sound control device 22 can further reduce
the volume of the sound output from the speaker 58 when the voltage of the battery is lowered.
Therefore, the sound control device 22 can lengthen the drive time of the sound control device
22 by the battery by further suppressing the power consumption accompanying the output of
the sound from the speaker 58.
09-05-2019
22
[0069]
Further, the sound control device 22 acquires the set value Vc of the volume of the speaker 58
(S55), and is applied to determine the adjustment coefficient q among the curves 543A to 543C
of the third graph 543 according to the set value Vc. The curve to be selected is selected (S57).
Therefore, the sound control device 22 can reflect the change of the setting value Vc on the
volume of the sound output from the speaker 58. For example, the case where the echo of the
sound in the first place 3 is small is taken as an example. In such a case, the user 30 may receive
an instruction to increase the volume through the operation unit 56 of the sound control device
22 because the manner of transmission of the sound output from the speaker 58 of the sound
control device 22 is weak. is there. In this case, the sound control device 22 can select the curve
543B for which the larger adjustment factor q is determined. As a result, a louder sound is output
from the speaker 58 of the sound control device 22, so that the user 30 can hear the sound
output from the speaker 58 of the sound control device 22 well.
[0070]
In addition, this invention is not limited to the said embodiment, A various change is possible. In
the above embodiment, the reference signal is not limited to the signal indicating the sound itself.
For example, the reference signal may be data indicating a volume.
[0071]
For example, the case where the distance between the sound control devices 21 and 22 is large is
taken as an example. In this case, the volume V (K2) of the sound when the sound control device
22 receives the sound output from the speaker 58 of the sound control device 21 through the
microphone 57 may be very small. In this case, in S31, it is determined that the difference V (Kr)
-V (K2) (.apprxeq.0) approximates the volume V (Kr). In such a case, the CPU 51 may further
increase the adjustment factor q determined based on the third graph 543 so that the adjustment
factor Q calculated in S41 becomes larger. For example, the CPU 51 may increase the adjustment
factor q by multiplying the adjustment factor q determined based on the third graph 543 by a
factor of 1 or more. In this case, since the volume V (Ko) of the sound indicated by the output
sound signal Ko is further increased, a louder sound is output from the speaker 58 of the sound
control device 22. Therefore, even when the distance between the sound control devices 21 and
22 is large, the sound control device 22 can transmit the sound output from the speaker 58 to
09-05-2019
23
the user 31 disposed in the vicinity of the sound control device 21.
[0072]
The CPU 51 determines a curve to be applied to determine the adjustment coefficient q among
the curves 543A to 543C of the third graph 543 according to the acoustic environment of the
first place 3 where the sound control device 22 is installed. It is also good. For example, even if
the CPU 51 acquires the reverberation characteristic of the first place 3 and selects the curve to
be applied to determine the adjustment coefficient q among the curves 543A to 543C of the third
graph 543 according to the acquired reverberation characteristic. Good. For example, when the
CPU 51 determines that the environment is high in reverberation, the CPU 51 selects the curve
543C so that the adjustment coefficient q to be determined is small, and determines the
adjustment coefficient q when the environment is low in reverberation. The curve 543 B may be
selected such that
[0073]
In the above embodiment, the adjustment coefficient q of the third graph 543 is set to a level
that matches the volume V (K2) of the sound indicated by the second sound signal K2 with the
volume V (Kr) of the sound indicated by the reference signal Kr. In order to increase it, it is a
multiplier by which the sound volume V (K2) is multiplied. The adjustment coefficient q may be a
multiplier by which the volume V (K2) is multiplied to increase the volume V (K2) to a level
approximating the volume V (Kr). Also, the level approximate to the volume V (Kr) may be set by
the user 30.
[0074]
In the above embodiment, when the CPU 51 determines that the difference calculated in S29 is
less than 0 (S31: NO), the adjustment coefficient Q is determined to be 0 (S35). On the other
hand, when the CPU 51 determines that the difference calculated in S29 is less than 0 (S31: NO),
in S13, the output sound signal Ko is inhibited from being output to the D / A converter 65.
Output may be prohibited.
[0075]
09-05-2019
24
FIG. 9 shows the flow of signals of the sound control device 22 in the modification. A different
point from FIG. 4 is that an input determination unit 71 is added. When the volume V (K1) of the
sound indicated by the first sound signal K1 becomes equal to or less than the predetermined
threshold, the CPU 51 causes the sound collected by the microphone 57 to include the voice
uttered by the user 32 at a large ratio. It is determined that the ratio of the sound output from
the speaker 58 of the sound control device 21 is small. In this case, the volume V (K2) of the
sound indicated by the second sound signal K2 also decreases. In such a case, the CPU 51
determines the reference coefficient P by applying the fourth graph 544 (see FIG. 10) based on
the sound signal Kj of the sound collected via the microphone 57 (input determination unit 71).
To generate a reference signal Kr (reference signal generator 62).
[0076]
As shown in FIG. 10, the curve 544A included in the fourth graph 544 has its inclination adjusted
such that a smaller reference coefficient P is identified as the volume V (Kj) of the sound
indicated by the sound signal Kj increases. It is done. When the reference coefficient P is
specified based on the fourth graph 544, the higher the volume of the voice uttered by the user
32, the smaller the reference coefficient P specified, and the sound indicated by the generated
reference signal Kr. The volume also decreases. Therefore, when the volume V (Kr) of the sound
indicated by the reference signal Kr and the volume V (K2) of the sound indicated by the second
sound signal K2 are compared (the signal comparison unit 63), the sound signal K2 Even when
the volume V (K2) of the sound to be indicated is small, the adjustment factor Q can be
determined accurately.
[0077]
The USB I / F 55 corresponds to the “communication unit” in the present invention. The CPU
51 that performs the process of S15 corresponds to the "receiving means" of the present
invention. The CPU 51 that performs the process of S27 corresponds to the "first generation
means" of the present invention. The CPU 51 that performs the process of S11 corresponds to
the "first acquisition unit" of the present invention. The CPU 51 that performs the process of S19
corresponds to the "second generation unit" of the present invention. The CPU 51 that performs
the process of S13 corresponds to the "output unit" of the present invention. The CPU 51 that
performs the process of S55 corresponds to the "second acquisition unit" of the present
invention. The CPU 51 that performs the process of S51 corresponds to the "third acquisition
09-05-2019
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unit" of the present invention.
[0078]
1 Sound control system 20, 21, 22, 23, 24 Sound control device 51 CPU 54 Flash memory 541
1st graph 542 2nd graph 543 3rd graph 57 Microphone 58 Speaker
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