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DESCRIPTION JP2009303134

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DESCRIPTION JP2009303134
The present invention provides a loudspeaker system capable of reducing power consumption
when the loudspeaker area is not crowded. A loudspeaker system 1 includes a plurality of
speakers 3 installed in a loudspeaker area, a congestion degree detection unit 21 for detecting a
congestion degree parameter representing a degree of congestion in the loudspeaker area, and a
loudspeaker area based on the congestion degree parameter. The congestion degree
determination unit 23, which determines whether or not the user is in a non-congested state, and
the plurality of speakers 3 are turned off so as to turn off part of the plurality of speakers 3 when
the sound amplification area is in a non-congested state And a speaker power control unit 25
that controls power supply. The sound pressure in the loud sound area is detected as the
congestion degree parameter. The sound pressure of the loud sound area may be determined
from the input sound signal acquired by causing the speaker 3 to function as a microphone.
[Selected figure] Figure 1
Loudspeaker system
[0001]
The present invention relates to a loudspeaker system that outputs voice from a plurality of
speakers installed in a loudspeaker area.
[0002]
2. Description of the Related Art Conventionally, as a loudspeaker system, there has been known,
for example, a business broadcast system for performing on-premises broadcasting in a
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department store, a factory, a company or the like.
In a conventional general loudspeaker system, power to system components including an
amplifier and a speaker is turned on at the same time before the start of work, and power is
maintained during working hours and turned off at the same time after work.
[0003]
Further, in the conventional loudspeaker system, volume adjustment is performed according to
the degree of congestion in the loudspeaker area. In the volume adjustment, the reproduction
volume level of the sound source device is set high or the reception volume level on the speaker
side is set high in a time zone in which congestion is expected.
[0004]
Also, Patent Document 1 and Patent Document 2 disclose a loudspeaker system provided with an
automatic power on / off function. Patent Document 1 discloses a nurse call device, which uses a
call from a patient as a trigger to supply power to a speaker amplifier and normally turns off the
power. Moreover, patent document 2 is disclosing the gas leak alarm. In the document, when an
abnormality occurs, power is supplied to the speaker amplifier, and the power is normally turned
off. JP-A-2001-268251 JP-A-62-24399
[0005]
However, in the conventional general loudspeaker system, even when the loudspeaker area is
low, the power of the speaker remains on, which causes the problem of wasted power
consumption. This point is the same as in the case of a loudspeaker system that performs volume
adjustment during off-hours and congestions, that is, even if volume adjustment is performed, the
power of the speaker is always on, and power is wasted.
[0006]
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2
Further, in the volume adjustment in the conventional loudspeaker system, a time zone in which
congestion occurs is predicted in advance, a schedule is created so as to increase the volume in
the predicted time zone, and the volume is automatically adjusted using a timer according to the
schedule. In this case, there is a problem that the predicted time zone and the actual congestion
time zone deviate. In addition, the operator can manually adjust the volume by observing the
degree of congestion. The volume can also be adjusted for each broadcast location using a
dedicated volume control device. However, manual adjustment requires personnel for monitoring
and operation, and there is also a problem that appropriate volume adjustment can not be
performed when there is variation in the degree of congestion.
[0007]
Also, the prior art loudspeaker systems previously described turn off the amplifier power when
there is no patient call. In another conventional loudspeaker system, the amplifier power is
turned off when there is no abnormality. However, these conventional loudspeaker systems are
not effective in reducing the power consumption during distraction of the loudspeaker area. That
is, although it is necessary to secure a sound volume enough to allow a person in the area to
listen to the broadcast even in a quiet area in the sound amplification area, the conventional
system can not secure the necessary sound volume because the amplifier power is turned off.
[0008]
The present invention has been made to solve the conventional problems, and its purpose is to
secure the volume necessary for a person in the loud area to listen to the broadcast when the
loud area is not crowded. An object of the present invention is to provide a loudspeaker system
capable of reducing power consumption.
[0009]
A loudspeaker system according to the present invention includes a plurality of speakers
installed in a loudspeaker area, a congestion degree detection unit for detecting a congestion
degree parameter representing a degree of congestion in the loudspeaker area, and the
congestion detected by the congestion degree detection unit A congestion degree determination
unit that determines whether or not the wide area is in a non-congested state based on a degree
parameter; and the large area is in the non-congested state based on the determination results of
the congestion level determination unit. And a speaker power control unit configured to control
power supply to the plurality of speakers so as to turn off power of a part of the plurality of
speakers.
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[0010]
According to this configuration, the congestion degree parameter of the sound amplification area
is detected, and when the sound amplification area is in a non-congested state, the power of
some speakers is turned off.
The broadcast can continue because some speakers are turned off.
Therefore, when the broadcast area is not crowded, power consumption can be reduced while
securing the volume necessary for a person in the broadcast area to listen to the broadcast.
[0011]
Further, in the loudspeaker system according to the present invention, the congestion degree
detection unit detects sound pressure in the loudspeaker area as the congestion degree
parameter. With this configuration, sound pressure is used as the congestion degree parameter,
and power consumption can be suitably reduced according to the congestion degree.
[0012]
Further, in the loudspeaker system according to the present invention, the congestion degree
detection unit obtains an average value of the sound pressure in a predetermined sound pressure
measurement time. According to this configuration, since the average value of the sound
pressure is used, it is possible to avoid erroneously determining that congestion has occurred
when sudden sounds occur. Therefore, power control can be performed accurately according to
the degree of congestion.
[0013]
Further, in the loudspeaker system according to the present invention, the congestion degree
detection unit obtains the sound pressure of the loudspeaker area from an input sound signal
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acquired by causing at least one of the plurality of speakers to function as a microphone. With
this configuration, since the speaker functions as a microphone, the degree of congestion can be
suitably detected without providing a separate microphone.
[0014]
In the loudspeaker system according to the present invention, the congestion degree
determination unit compares the sound pressure with a predetermined threshold sound pressure,
and the speaker power control unit compares the sound pressure with the threshold sound
pressure or less. Turn off the power supply to part. With this configuration, power control can be
performed according to the degree of congestion by comparing the sound pressure with a
predetermined threshold sound pressure. Power consumption can be reduced by relatively
simple processing.
[0015]
In the loudspeaker system according to the present invention, the threshold sound pressure is set
differently for the plurality of speakers, and the congestion degree determination unit compares
the sound pressure with the threshold sound pressure corresponding to each speaker, The
speaker power control unit turns off the power of the corresponding speaker when the sound
pressure is equal to or less than the threshold sound pressure. According to this configuration,
different numbers of speakers are turned off depending on the detected sound pressure.
Therefore, with the simple configuration in which the threshold sound pressure is set for each
speaker, the number of powered off speakers can be controlled to further reduce the power
consumption.
[0016]
Further, in the loudspeaker system according to the present invention, the congestion degree
determination unit analyzes a tendency of a sound pressure change to determine whether there
is a sound pressure change tendency corresponding to the non-congested state, and the speaker
power control The unit turns off the power supply to a part of the plurality of speakers when
there is a sound pressure change tendency corresponding to the non-congested state.
[0017]
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With this configuration, it is possible to analyze the sound pressure change tendency, perform
the power control of the speaker according to the degree of congestion, and reduce the power
consumption.
This configuration is advantageous in the following points. It may not be easy to properly set the
threshold sound pressure as an absolute reference for congestion degree determination. For
example, it is assumed that the sound transmission state differs depending on the place and the
appropriate threshold sound pressure differs. In this case, it is required to set the threshold
sound pressure by measuring the sound pressure at various places. However, such work is not
easy. Further, unlike the case where a dedicated microphone is used, when the speaker is used as
the microphone, the sound pressure measurement place is limited to the speaker installation
place, and therefore, the appropriate setting of the threshold sound pressure may not be easy. On
the other hand, the present invention focuses on the fact that the characteristic of the sound
pressure change differs depending on the degree of congestion. Since the degree of congestion is
determined based on such sound pressure change characteristics, the degree of congestion can
be detected easily and appropriately.
[0018]
Further, in the loudspeaker system according to the present invention, the congestion degree
determination unit determines whether the sound pressure tends to decrease continuously over a
predetermined non-congestion reference time as the sound pressure change tendency
corresponding to the non-congested state. Determine According to this configuration, the
congestion degree can be suitably determined by the analysis of the sound pressure change
tendency. The degree of congestion can be detected easily and properly, since absolute criteria
such as threshold sound pressure need not be used.
[0019]
Further, in the loudspeaker system according to the present invention, the congestion degree
determination unit determines whether the sound pressure tends to decrease continuously over a
predetermined non-congestion reference time as the sound pressure change tendency
corresponding to the non-congested state. Determine According to this configuration, the
congestion degree can be suitably determined by the analysis of the sound pressure change
tendency. The degree of congestion can be detected easily and properly, since absolute criteria
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such as threshold sound pressure need not be used.
[0020]
Further, in the loudspeaker system according to the present invention, the determination
reference of the sound pressure change tendency corresponding to the non-congested state is set
differently for the plurality of speakers, and the congestion degree determination unit determines
the determination corresponding to each speaker A sound pressure change tendency is analyzed
using a standard, and the speaker power control unit turns off the power of the speaker
corresponding to the determination result that the sound pressure change tendency
corresponding to the non-congested state is present. According to this configuration, different
numbers of speakers are powered off according to the degree of congestion. By the simple
configuration in which the determination reference of the sound pressure change tendency is set
for each speaker, it is possible to control the number of power off speakers and to further reduce
the power consumption.
[0021]
Further, in the loudspeaker system according to the present invention, the speaker power control
unit changes the number of speakers whose power is turned off stepwise according to the degree
of congestion of the loudspeaker area. According to this configuration, power can be supplied to
an appropriate number of speakers according to the degree of congestion, and the power of the
remaining speakers can be turned off. Therefore, the number of powered off speakers can be
controlled to further reduce the power consumption.
[0022]
Further, according to the loudspeaker system control method of the present invention, a
congestion degree parameter representing a degree of congestion in a loudspeaker area provided
with a plurality of speakers is detected, and based on the congestion degree parameter, is the
loudspeaker area in a non-congested state? It is determined whether or not the plurality of
loudspeakers are supplied with power so as to turn off part of the plurality of loudspeakers when
the loudspeaker area is in the non-congested state. This method also achieves the abovementioned advantages of the present invention. Of course, the various configurations described
with respect to the loudspeaker system aspect may also be applied to this method aspect.
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[0023]
Another aspect of the present invention is a loudspeaker control program executed by a system
control unit of a loudspeaker system including a plurality of speakers installed in a loudspeaker
area, the congestion control program representing the degree of congestion in the loudspeaker
area A degree parameter is detected, and based on the congestion degree parameter, it is
determined whether or not the loudspeaker area is in a non-congested state, and when the
loudspeaker area is in the non-congested state, a power supply of a part of the plurality of
speakers And causing the system control unit to execute a process of controlling power supply to
the plurality of speakers so as to turn off. This configuration also achieves the above-described
advantages of the present invention. Of course, the various configurations described with respect
to the loudspeaker system aspect may also be applied to this aspect.
[0024]
The present invention detects the degree of congestion in the loud sounding area and turns off
the power of at least a part of the speakers when the loud sounding area is not crowded. It is
possible to provide a loudspeaker system having an effect that wasteful power consumption can
be reduced while securing a volume necessary for a person in a loudspeaker area to listen to a
broadcast.
[0025]
Hereinafter, a loudspeaker system according to an embodiment of the present invention will be
described using the drawings.
[0026]
A loudspeaker system according to a first embodiment of the present invention is shown in FIG.
In the example of the present embodiment, the sound amplification system 1 is an on-premises
operation broadcasting system of a department store.
However, it is a matter of course that the sound amplification system 1 is not limited to the on-
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premises business broadcast system.
[0027]
In FIG. 1, the loudspeaker system 1 includes a plurality of speakers 3, a plurality of amplifiers 5,
a power supply unit 7, and a system control unit 9. The plurality of speakers 3 are connected to
the power supply unit 7 via the plurality of amplifiers 5. Each speaker 3 is supplied with power
from the power supply unit 7 via the amplifier 5.
[0028]
As shown in FIG. 1, in the present embodiment, a speaker line 11 extends from each amplifier 5,
and a plurality of speakers 3 are connected to each speaker line 11. The speaker line 11 is a
power supply line and an audio line for broadcasting, and supplies an audio signal to be
broadcasted to each speaker 3. For example, a plurality of sound amplification areas are set for
each of the plurality of floors. Then, one or a plurality of speaker lines 11 are provided in each of
the sound amplification areas, and a plurality of speakers 3 are connected to each of the speaker
lines 11.
[0029]
Each speaker 3 is further connected to the system control unit 9 via a control line 13 indicated
by a broken line and an audio line 15 for sound collection indicated by a double line. The control
line 13 is provided for the system control unit 9 to control the speakers 3 individually. In the
present embodiment, the control line 13 is used to control the power supply of the loudspeakers
3. Specifically, the on / off control of the power supply switch provided in each loudspeaker 3 is
performed, and the connection to the loudspeaker circuit 13 is disconnected by switching off. .
For the sake of simplicity, FIG. 1 shows that one control line 13 extends corresponding to each
speaker line 11 and is branched therefrom to be connected to a plurality of speakers 3. In an
actual configuration, a control line 13 may be provided for each speaker 3. Further, as described
below, the sound collection sound line 15 is used to cause the speaker 3 to function as a
microphone and to collect the sound in the sound amplification area.
[0030]
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The system control unit 9 is configured by a computer and controls the entire sound
amplification system 1. The system control unit 9 detects the congestion degree parameter
indicating the degree of congestion in the loud sounding area, and the loudness area is in a noncongested state based on the congestion degree parameter detected by the congestion degree
detecting unit 21. And a speaker power control unit 25 that controls power supply to the
plurality of speakers 3 based on the determination result of the congestion degree determination
unit 23. It controls the power on / off of each speaker 3.
[0031]
In the present embodiment, the sound pressure is determined as the congestion degree
parameter. The system control unit 9 controls the plurality of speakers 3 to also function as a
microphone in order to detect the sound pressure. As is well known, the speaker and the
microphone have the same structure, and the speaker can in principle function as a microphone.
Using this function, the system control unit 9 controls the speaker 3 to function as a microphone,
and acquires an audio signal of a loud sound area via the audio line 15 for sound collection.
When the system control unit 9 causes the speaker 3 to function as a microphone, the system
control unit 9 stops the audio output from the corresponding speaker 3.
[0032]
The speaker 3 may be a microphone speaker in which a microphone and a speaker are
integrated. In this case, the system controller 9 may control the microphone function of the
microphone speaker.
[0033]
FIG. 2 shows the configuration of the system control unit 9. As described above, the system
control unit 9 includes the congestion degree detection unit 21, the congestion degree
determination unit 23, and the speaker power control unit 25. The congestion degree detection
unit 21 includes an A / D conversion unit 31, a sound pressure calculation processing unit 33,
and an averaging processing unit 35. The system control unit 9 further includes a calculation
result storage unit 41 and a threshold sound pressure storage unit 43.
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[0034]
An audio signal is input to the system control unit 9. As described above, the audio signal is
collected by the speaker 3 functioning as a microphone and input to the system control unit 9.
The A / D conversion unit 31 of the congestion degree detection unit 21 converts the input
analog audio signal into a digital audio signal.
[0035]
The sound pressure calculation processing unit 33 processes the sound signal converted into the
digital format to calculate the sound pressure, stores the sound pressure data in the calculation
result storage unit 41, and averages the sound pressure data. Supply to
[0036]
The averaging processing unit 35 calculates an average value of sound pressure in a
predetermined sound pressure measurement time.
Here, the latest sound pressure data is acquired from the sound pressure calculation processing
unit 33, the sound pressure data of a predetermined time in the past is acquired from the
calculation result storage unit 41, and the average value is calculated.
[0037]
The processing of the congestion degree detection unit 21 described above is performed, for
example, for each of the speaker lines 11. When a plurality of speakers 3 are used as a
microphone in one speaker line 11, a plurality of sound pressure average values are calculated
from the audio input of the plurality of speakers 3. In this case, the plurality of sound pressure
average values may be further averaged. The processing of the congestion degree determination
unit 23 and the speaker power control unit 25 described below is also performed for each of the
speaker lines 11.
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[0038]
The congestion degree determination unit 23 processes the sound pressure average value as the
congestion degree parameter supplied from the averaging processing unit 35, and determines
whether or not the loudspeaker area is in a non-congested state. In the present embodiment, the
congestion degree determination unit 23 determines the congestion degree using the threshold
sound pressure. The threshold sound pressure is set in advance and stored in the threshold
sound pressure storage unit 43. The congestion degree determination unit 23 compares the
average value of the sound pressure acquired from the averaging processing unit 35 with the
threshold sound pressure, and determines whether the average value of the sound pressure is
equal to or less than the threshold sound pressure. If the average value of the sound pressure is
lower than the threshold sound pressure, the degree of congestion is low and the sound
amplification area is in a non-congested state.
[0039]
Here, the setting of the threshold sound pressure will be further described. The threshold sound
pressure is used to determine the presence or absence of congestion as described above. The
threshold sound pressure may be set according to the expected maximum sound pressure in the
non-congested state. The threshold sound pressure may be equal to the expected maximum
sound pressure. The threshold sound pressure may be set to a value obtained by adding an
appropriate value to the predicted maximum sound pressure, and in this case, the power saving
effect of the present invention can be increased. Also, the threshold sound pressure may be set to
a value obtained by subtracting an appropriate value from the predicted maximum sound
pressure, and in this case, the control of the present invention is performed when the loud sound
area is surely in a non-congested state.
[0040]
The predicted maximum sound pressure in the non-congested state may be obtained by
measurement. For example, the sound pressure is measured when the loudspeaker area is
relatively sparse, such as immediately after the start of work. A plurality of measurement results
may be statistically processed to obtain an estimated maximum sound pressure. The threshold
sound pressure is suitably set using the predicted maximum sound pressure thus obtained. In the
example of the present embodiment, a loudspeaker system 1 is installed in a department store. In
this case, it is desirable to set the threshold sound pressure for each floor and each loud sound
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area. The threshold sound pressure is stored in the threshold sound pressure storage unit 43, is
referred to by the congestion degree determination unit 23, and is used to determine the
congestion degree.
[0041]
The speaker power control unit 25 is configured to control power supply to each of the plurality
of speakers 3. The speaker power control unit 25 performs a process of turning off at least a part
of power of the plurality of speakers 3 when the congestion degree determination unit 23
determines that the sound amplification area is in the non-congested state. Specifically, when the
sound pressure is less than or equal to the threshold sound pressure as determined by the
congestion degree determination unit 23, control of power-off is performed. The speaker power
control unit 25 turns off the power of a predetermined number, for example, half, of the speakers
3. Moreover, control of power-off is suitably performed, when a non-congested state continues
for a predetermined time.
[0042]
As described above, the processing of the congestion degree detection unit 21, the congestion
degree determination unit 23, and the speaker power control unit 25 is performed for each of
the speaker lines 11. Therefore, when the sound pressure in a certain speaker line 11 becomes
lower than the threshold sound pressure, the speaker power control unit 25 turns off the power
of a predetermined number of speakers 3 connected to the corresponding speaker line 11.
[0043]
Further, the number of speakers for turning off the power in the above control is set as follows.
Even if the broadcast area is in a non-congested state, it is necessary to secure the volume
necessary for the people in the area to listen. The number of speakers capable of securing the
necessary volume should be maintained in the power on state. Therefore, the number of
powered-off speakers is set to a value obtained by subtracting the number of speakers necessary
for the above-mentioned listening from the total number of speakers in each of the sound
amplification areas. The number of powered-off speakers may be set differently for each of the
loudspeaker areas.
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[0044]
In the above control, which speaker is to be turned off may be set in advance. It is desirable that
the powered off speakers be properly distributed. For example, if half of the speakers are turned
off, every other speaker is turned off.
[0045]
The configuration of the loudspeaker system 1 has been described above. Next, the operation of
the loudspeaker system 1 will be described with reference to FIG.
[0046]
As shown in FIG. 3, the system control unit 9 causes the speaker 3 to function as a microphone
to acquire an audio signal from the sound amplification area (S 1). The A / D conversion unit 31
converts the input audio signal in analog format into an audio signal in digital format (S3), the
sound pressure calculation processing unit 33 calculates sound pressure (S5), and the averaging
processing unit 35 determines The average value of the sound pressure of time is calculated (S7).
[0047]
The congestion degree determination unit 23 compares the sound pressure (average value)
obtained from the averaging processing unit 35 with the threshold sound pressure stored in the
threshold sound pressure storage unit 43 (S9). As a result of comparison, when the sound
pressure is larger than the threshold sound pressure (S11, Yes), the congestion degree is "high",
and the sound area is not in a non-congested state, that is, not in a disappointing state. Therefore,
the speaker power control unit 25 supplies power to the plurality of speakers 3 (S13).
[0048]
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When the measured sound pressure is equal to or lower than the threshold sound pressure (S11,
No), the degree of congestion is "low", and the sound amplification area is in a non-congested
state. Therefore, the speaker power control unit 25 turns off the power of the predetermined
number of speakers 3 (S15).
[0049]
The above process is performed individually for each of the plurality of speaker lines 11. The
speaker lines 11 are provided for each floor and for each of the loud areas. Therefore, the power
supply to the speakers 3 can be controlled in each of the loudspeaker areas according to the
degree of congestion.
[0050]
Also, the above processing may be performed in real time or periodically. However, in the
present embodiment, if the on / off of the speaker is frequently performed, the amount of power
consumption may increase. In consideration of this point, it is desirable to periodically perform
the above process. The cycle of processing is preferably set to be sufficiently long, for example,
30 minutes.
[0051]
Further, although the plurality of speakers 3 are connected to one speaker line 11 (voice line for
broadcasting) in the above embodiment, in another configuration example, each speaker 3 is
connected to one speaker line 11 It may be connected. Even in this case, power supply is suitably
controlled for each speaker 3. Then, a plurality of speakers 3 installed in one broadcast area may
be controlled as one group, and some of the speakers 3 in the group may be powered off
according to the degree of congestion. Furthermore, the loudspeaker system may be a
combination of a configuration in which a plurality of speakers 3 are connected to one speaker
line 11 and a configuration in which one speaker 3 is connected to one speaker line 11.
[0052]
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The first embodiment of the present invention has been described above. In the first
embodiment, the loudspeaker system 1 detects the congestion degree parameter of the
loudspeaker area, and turns off the power of some speakers when the loudspeaker area is in a
non-congested state. Since the power of some of the speakers 3 is turned off, the broadcast can
be continued. Therefore, when the broadcast area is not crowded, power consumption can be
reduced while securing the volume necessary for a person in the broadcast area to listen to the
broadcast.
[0053]
In addition, according to the present embodiment, power saving can be realized with a relatively
simple configuration in which a configuration for congestion degree determination is added to a
speech enhancement system such as an existing business broadcast system.
[0054]
Further, in the present embodiment, the sound pressure in the sound amplification area may be
detected as the congestion degree parameter.
Therefore, sound pressure is used as the congestion degree parameter, and power consumption
can be suitably reduced according to the congestion degree.
[0055]
Further, in the present embodiment, the congestion degree detection unit 21 may obtain an
average value of sound pressure in a predetermined sound pressure measurement time. Since the
average value of the sound pressure is used, it is possible to avoid erroneously determining that
congestion has occurred when a sudden sound occurs. For example, it can be avoided that the
impact sound due to the drop of the object, the door open / close sound, etc. are misjudged as
the occurrence of congestion. Therefore, power control can be performed accurately according to
the degree of congestion.
[0056]
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Further, in the present embodiment, the congestion degree detection unit 21 may obtain the
sound pressure of the sound amplification area from the input sound signal acquired by causing
at least one of the plurality of speakers 3 to function as a microphone. Therefore, since the
speaker functions as a microphone, the degree of congestion can be suitably detected without
providing a separate microphone.
[0057]
Furthermore, in the present embodiment, the congestion degree determination unit 23 may
compare the sound pressure with a predetermined threshold sound pressure, and the speaker
power control unit 25 may be configured to use the plurality of speakers 3 when the sound
pressure is equal to or lower than the threshold sound pressure. The power supply to part may
be turned off. Therefore, power control can be performed according to the degree of congestion
by comparing the sound pressure and the predetermined threshold sound pressure. Power
consumption can be reduced by relatively simple processing.
[0058]
Next, a second embodiment of the present invention will be described. In the second
embodiment, the overall configuration of the loudspeaker system is the same as that of the first
embodiment of FIG. The second embodiment and the first embodiment are different in the
configuration for determining the degree of congestion of the system control unit 9. In the
following description, descriptions of matters that overlap with the first embodiment will be
omitted.
[0059]
FIG. 4 shows the configuration of the system control unit 9 in the present embodiment. The
congestion degree detection unit 21 and the calculation result storage unit 41 are the same as
the configuration of the first embodiment shown in FIG.
[0060]
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The congestion degree determination unit 51 processes the average value of the sound pressure
provided from the averaging processing unit 35 of the congestion degree detection unit 21 to
determine the congestion degree. In the first embodiment, the sound pressure was compared to
the threshold sound pressure. On the other hand, in the second embodiment, attention is paid to
the fact that the sound pressure change tendency changes in accordance with the congestion
degree, and the congestion degree is determined based on the sound pressure change.
[0061]
The congestion degree determination unit 51 stores the sound pressure supplied from the
averaging processing unit 35 in the sound pressure storage unit 53. The congestion degree
determination unit 51 processes the accumulated sound pressure and the sound pressure
supplied from the averaging processing unit 35, analyzes the sound pressure change tendency,
and determines the congestion degree.
[0062]
Specifically, when the degree of congestion is "low" and the sound amplification area is in a noncongested state, the sound pressure change characteristic tends to decrease continuously.
Therefore, the congestion degree determination unit 51 determines whether the sound pressure
tends to decrease continuously for a predetermined non-congestion reference time (hereinafter,
this tendency is referred to as the sound pressure decrease tendency). In addition, when the
degree of congestion is “high” and the loudspeaker area is not in a non-congested state, the
sound pressure change characteristic tends to continuously increase. Therefore, the congestion
degree determination unit 51 determines whether the sound pressure tends to increase
continuously over a predetermined congestion reference time (hereinafter, this tendency is
referred to as a sound pressure increase tendency). The non-congestion reference time and the
congestion reference time are stored in advance, and are referred to by the congestion degree
determination unit 51.
[0063]
The speaker power control unit 25 functions in the same manner as in the first embodiment.
That is, when the congestion degree determination unit 51 detects the sound pressure decrease
tendency, the speaker power control unit 25 performs a process of turning off the power supply
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of at least a part of the plurality of speakers 3. In addition, it is assumed that the increase in
sound pressure is detected by the congestion degree determination unit 51 when the power of
some of the speakers 3 is off. In this case, the speaker power control unit 25 performs control to
supply power to all the speakers 3. These processes are performed for each of the speaker lines
11 as described above.
[0064]
FIG. 5 shows the operation of the loudspeaker system in the present embodiment. Steps S1 to S7
are the same as the corresponding processing in the first embodiment. The congestion degree
determination unit 51 analyzes the tendency of change in sound pressure (average value)
obtained from the averaging processing unit 35, and determines the congestion degree (S21). As
described above, since there is a relationship between the degree of congestion and the change in
sound pressure, the degree of congestion can be determined based on the sound pressure change
characteristic corresponding to the degree of congestion. As a result of the trend analysis, when
the sound pressure increasing tendency is detected (S21, Yes), the sound area is not in the noncongested state, that is, not in the disappointing state. Therefore, the control processing unit 33
supplies power to all the speakers 3 connected to the processing target speaker line 11 (S13).
Therefore, when the determination in step S21 is Yes when the power of some of the speakers is
off, the power of all the speakers is turned on.
[0065]
Also, as a result of the trend analysis, when the sound pressure decreasing tendency is detected
(S23, Yes), the congestion degree is "low", and the sound amplification area is in a non-congested
state. In this case, the speaker power control unit 25 turns off the power of the predetermined
number of speakers 3 connected to the processing target speaker line 11 (S15). If neither the
sound pressure increase tendency nor the sound pressure decrease tendency is detected (S23,
No), the processing is ended without changing the on / off state of the speaker.
[0066]
Here, the second embodiment will be compared with the first embodiment. In the first
embodiment, the threshold sound pressure is set in advance for congestion degree
determination. The threshold sound pressure can be said to be an absolute reference value. On
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the other hand, the second embodiment uses relative change of sound pressure. Therefore, the
threshold may not be set in advance. This is advantageous for the following reasons.
[0067]
The threshold sound pressure may not be easy to set appropriately in advance. For example, it is
assumed that the sound transmission state differs depending on the place and the appropriate
threshold sound pressure differs. In this case, it is required to set threshold sound pressure by
measuring congestion and sound pressure at various places. However, such work is not easy.
[0068]
Furthermore, since the speaker 3 is used as a microphone in the present embodiment, setting of
the threshold sound pressure may not be easy. That is, while the sound pressure can be
measured at any place by using a dedicated microphone, when the speaker 3 is used as a
microphone, the sound pressure measurement place should be the speaker installation place. It
may not be easy to properly set the threshold sound pressure, which is an absolute reference, in
the measurement results of such a constrained place.
[0069]
On the other hand, the present embodiment focuses on the fact that the sound pressure change
characteristics differ depending on the degree of congestion. Since the degree of congestion is
detected based on such a sound pressure change characteristic, it is not necessary to use the
threshold sound pressure. Therefore, the degree of congestion can be detected easily and
appropriately.
[0070]
Next, a variation of the trend analysis process will be described. In the above example, the
congestion degree determination unit 51 determines whether or not there is a sound pressure
reduction tendency in which the sound pressure decreases over a predetermined non-congestion
reference time. In the modification, the congestion degree determination unit 51 may determine
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whether the sound pressure tends to decrease in the predetermined non-congestion reference
time by a predetermined decrease range or more in the determination of the sound pressure
decrease tendency. Similarly, in the determination of the sound pressure increase tendency, the
congestion degree determination unit 51 may determine whether the sound pressure tends to
increase in a predetermined congestion reference time by a predetermined increase width or
more. The degree of congestion can be determined more accurately by using the sound pressure
change width.
[0071]
In another example, the congestion degree determination unit 51 monitors the change in sound
pressure and determines whether the sound pressure at the minimum level after the start of
monitoring tends to continue for a predetermined non-congestion reference time. Good. Such a
sound pressure maintenance tendency also appears when the degree of congestion is low and the
loudspeaker area is in a non-congested state. The non-congestion reference time may be the
same as or different from the judgment reference time of the sound pressure reduction tendency
described above. For example, monitoring starts when a department store is opened. It is often in
a non-congested state immediately after the start. Therefore, immediately after the start of
monitoring, the sound pressure at the minimum level corresponding to the non-congested state is
measured. After that, it is assumed that a non-congested state appears again. When the sound
pressure equivalent to the minimum level immediately after the opening of the store continues
for the non-congestion reference time, the congestion degree determination unit 51 determines
that the sound amplification area is in the non-congested state. Thus, the degree of congestion
can be suitably determined even by trend analysis using a minimum level of sound pressure.
[0072]
The second embodiment of the present invention has been described above. In the present
embodiment, the congestion degree determination unit 23 analyzes the tendency of the sound
pressure change to determine whether there is a sound pressure change tendency corresponding
to the non-congested state, and the speaker power control unit 25 determines the noncongestion state. Power supply to a part of a plurality of speakers is turned off when there is a
sound pressure change tendency corresponding to a congested state. Therefore, by analyzing the
sound pressure change tendency, power supply control of the speaker can be performed
according to the degree of congestion, and power consumption can be reduced. This
configuration is advantageous in this respect because there is no need to set the threshold sound
pressure, which is an absolute reference value, because relative changes in sound pressure are
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used as described above.
[0073]
Further, in the loudspeaker system of the present embodiment, the congestion degree
determination unit 23 determines whether the sound pressure tends to decrease continuously
over a predetermined non-congestion reference time as the sound pressure change tendency
corresponding to the non-congested state. It may be determined. According to this configuration,
the congestion degree can be suitably determined by the analysis of the sound pressure change
tendency. The degree of congestion can be detected easily and properly, since absolute criteria
such as threshold sound pressure need not be used.
[0074]
Further, in the loudspeaker system according to the present embodiment, the congestion degree
determination unit 23 determines whether the sound pressure tends to increase continuously
over a predetermined congestion reference time as the sound pressure change tendency
corresponding to the congestion state. You may judge. The speaker power control unit 25
performs control to turn on the power of all the speakers 3 when the sound pressure increasing
tendency is detected. Therefore, it is possible to preferably turn on the power again.
[0075]
Further, in the loudspeaker system according to the present embodiment, congestion degree
determination unit 23 monitors the change in sound pressure, and as the change in sound
pressure corresponding to the non-congested state, the sound pressure at the minimum level
after the start of monitoring is not predetermined. It may be determined whether there is a
tendency to continue over the congestion reference time. Therefore, the congestion degree can
be suitably determined by the analysis of the sound pressure change tendency. The degree of
congestion can be detected easily and properly, since absolute criteria such as threshold sound
pressure need not be used.
[0076]
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22
FIG. 6 shows a third embodiment of the present invention. The third embodiment is a
modification of the first embodiment. In the following, the description of matters overlapping
with the first embodiment will be omitted.
[0077]
In the first embodiment, the speaker 3 functions as a microphone, and the sound pressure in the
sound amplification area is measured. In the third embodiment, the microphones 61 are installed
in each of the sound amplification areas. The microphone 61 is connected to the system control
unit 9 via the sound line 15 for sound collection. The microphone 61 generates an audio signal
of the loud sound area and supplies the audio signal to the system control unit 9. The system
control unit 9 processes the audio signal as in the first embodiment to detect the degree of
congestion, and controls the power supply to the speaker 3.
[0078]
The third embodiment may be combined with the second embodiment. Also in this case, the input
voice signal from the microphone 61 is processed by the system control unit 9. Then, the degree
of congestion is determined by the tendency analysis of the sound pressure change, and the
power supply to the speaker 3 is controlled.
[0079]
The third embodiment of the present invention has been described above. In the present
embodiment, since the dedicated microphone 61 is provided, sound pressure measurement can
be performed more accurately.
[0080]
Next, a fourth embodiment of the present invention will be described. The fourth embodiment is
a modification of the first embodiment, and only differences from the first embodiment will be
described.
10-04-2019
23
[0081]
In the first embodiment, one fixed threshold sound pressure was used. Then, when the measured
sound pressure becomes equal to or less than the threshold sound pressure, the power of the
predetermined number of speakers 3 is turned off. In the fourth embodiment, the threshold
sound pressure is set differently for the plurality of speakers 3 in each of the sound amplification
areas. More specifically, the threshold sound pressure is set such that the threshold sound
pressure changes stepwise in the plurality of speakers 3. Thereby, the number of powered-off
speakers can be changed stepwise according to the degree of congestion in each of the sound
amplification areas.
[0082]
The configuration of the loudspeaker system of this embodiment may be the same as that of the
first embodiment shown in FIGS. 1 and 2. In the system control unit 9, the threshold sound
pressure storage unit 43 stores the threshold sound pressure of each speaker.
[0083]
The system control unit 9 causes all the speakers in the sound amplification area to function as a
microphone to acquire an audio signal. Then, the congestion degree detection unit 21 of the
system control unit 9 calculates the sound pressure for each speaker, and further calculates the
sound pressure average value for each speaker. The congestion degree determination unit 23
compares the sound pressure obtained from each speaker with the threshold sound pressure of
the speaker. If the sound pressure is equal to or lower than the threshold sound pressure, the
speaker power control unit 25 turns off the power of the corresponding speaker.
[0084]
The power supply control according to the present embodiment will be described using a specific
example. FIG. 7 shows an example of a facility where the loudspeaker system 1 of the present
embodiment is installed. In the example of FIG. 7, two floors are shown for simplification, and
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there are two amplification areas on each floor, and a total of four amplification areas (1st floor
A, 1st floor B, 2nd floor A, The second floor B) is shown.
[0085]
Four loudspeakers are connected to the loudspeaker circuit in each of the loudspeaker areas. As
illustrated, speakers 1A-1, 1A-2, 1A-3, and 1A-4 are installed in the first floor A of the area.
Similarly, speakers 1B-1, 1B-2, 1B-3, and 1B-4 are installed in the first floor area B, and speakers
2A-1, 2A-2, 2A-3, and the second floor area A are provided. 2A-4 is installed, and speakers 2B-1,
2B-2, 2B-3, and 2B-4 are installed in the second floor B of the area.
[0086]
The threshold sound pressure is set differently in stages depending on branch numbers (numbers
after hyphens). That is, the threshold sound pressure of branch No. 1 is -10 dB, the threshold
sound pressure of branch No. 2 is 0 dB, the threshold sound pressure of branch No. 3 is 6 dB,
and the threshold sound pressure of branch No. 4 is 12 dB . The threshold sound pressure is
common to the four areas (if the branch numbers are the same, the threshold sound pressure is
also common).
[0087]
In a certain time zone, as shown, area 1 floor A is congested, area 1 floor B is empty (no sound),
area 2 floor A is quite crowded, area 2 floor B It is assumed that the congestion was very low. As
a result of analyzing the sound collection data of each area, it is assumed that the sound pressure
has the following value. Here, for the sake of simplicity, it is assumed that the measurement
sound pressures of all the speakers in the same area are the same. Area first floor A: 7 dB area
first floor B: -10 dB area second floor A: 13 dB area second floor B: -1 dB
[0088]
FIG. 8 shows the control situation of each speaker corresponding to the above measurement
result. The sound pressure is 7 dB in area 1 floor A, so the sound pressure is below the threshold
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25
sound pressure of speaker 1A-4, and the sound pressure is the threshold sound pressure of
speakers 1A-1, 1A-2, 1A-3 Greater than. Therefore, the power supply of only the speaker 1A-4 is
off, and the power supply of the remaining speakers 1A-1, 1A-2, and 1A-3 is on.
[0089]
In the area 1 floor B, the sound pressure is −10 dB, which is equal to or less than the threshold
sound pressure of all the speakers. Thus, all speakers are powered off.
[0090]
In the area 2 floor A, the sound pressure is 13 dB, so the sound pressure is larger than the
threshold sound pressure of all the speakers. Thus, all speakers are powered on.
[0091]
In the second floor B, the sound pressure is −1 dB, so the sound pressure is larger than the
threshold sound of the speaker 2B-1, and the sound pressure is the threshold sound of the
remaining speakers 2B-2, 2B-3, 2B-4. Less than pressure. Therefore, the power supply of only the
speaker 2B-1 is turned on, and the power supplies of the remaining three speakers 2B-2, 2B-3,
and 2B-4 are turned off.
[0092]
Also, in the loudspeaker system according to the present embodiment, the area where the power
of all the speakers is turned off by always turning on the power of each speaker at the start of
high importance broadcasting such as public announcement or emergency broadcasting.
Broadcasting is also performed on the first floor B.
[0093]
FIG. 9 is a diagram conceptually showing the power saving effect according to the present
embodiment.
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The line in the figure shows the transition of the typical congestion degree in the business hours
of the department store. According to the present embodiment, the number of powered on
speakers increases or decreases according to the degree of congestion. The shaded portions in
the figure are the number of powered-off speakers in each time zone. The shaded area
corresponds to the reduction of power consumption.
[0094]
Next, a modification of the fourth embodiment will be described. In the example of FIG. 7, four
loud sound areas are shown, and each loud sound area has four speakers. However, the number
of areas and the number of speakers are not limited to the example of FIG.
[0095]
In the fourth embodiment, the threshold sound pressures of all the speakers in one area are
different from each other. However, within the scope of the present invention, the threshold
sound pressure may not be different for all the speakers. The threshold sound pressure may be
the same for a predetermined number of speakers. For example, in FIG. 7, the threshold sound
pressures of the branch numbers 1 and 3 may be the same, and the threshold sound pressures of
the branch numbers 2 and 4 may be the same. Such a configuration also corresponds to the
configuration of the present invention in which the threshold sound pressure differs among a
plurality of speakers.
[0096]
Further, the fourth embodiment is a modification of the first embodiment, and the congestion
degree determination processing uses a threshold sound pressure. On the other hand, the fourth
embodiment may be applied to the second embodiment as described below.
[0097]
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In the second embodiment, the congestion degree determination process analyzes the sound
pressure change tendency to determine the congestion degree. In the case where the fourth
embodiment is applied, the criterion of the sound pressure change tendency is set differently for
each speaker. The congestion degree determination unit 51 analyzes the sound pressure change
tendency using the determination criteria corresponding to each speaker, and the speaker power
control unit 25 corresponds to the determination result that there is a sound pressure change
tendency corresponding to the non-congested state. Turn off the speaker. Even in such a
configuration, the number of speakers can be changed stepwise according to the degree of
congestion, and power consumption can be further reduced by finer control.
[0098]
More specifically, in the second embodiment, the congestion degree determination unit 51
detects a tendency that the sound pressure decreases continuously for a predetermined noncongestion reference time, and continues for a predetermined congestion reference time.
Detected a tendency of increase in sound pressure. The non-congestion reference time and the
congestion reference time may be set differently for each speaker. Then, the determination of the
degree of congestion may be performed for each speaker, and the power supply of the
corresponding speaker may be controlled according to the determination result.
[0099]
Further, in another example of the second embodiment, the congestion degree determination unit
51 detects the tendency of the sound pressure to decrease by a predetermined decrease width or
more during the predetermined non-congestion reference time as the sound pressure decrease
tendency. Similarly, the congestion degree determination unit 51 detects, as a sound pressure
increase tendency, a tendency that the sound pressure increases at a predetermined congestion
reference time by a predetermined increase width or more. The reduction width and the increase
width may also be different for a plurality of speakers.
[0100]
In still another example of the second embodiment, the congestion degree determination unit 51
monitors a change in sound pressure and detects a tendency that the sound pressure at the
minimum level after the start of monitoring continues for a predetermined non-congestion
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reference time. . This non-congestion reference time may be set differently for a plurality of
speakers.
[0101]
The fourth embodiment has been described above. In the present embodiment, the speaker
power control unit 25 changes the number of speakers 3 whose power is turned off in a stepwise
manner in accordance with the degree of congestion of the sound amplification area. With this
configuration, power can be supplied to the appropriate number of speakers 3 according to the
degree of congestion, and the power of the remaining speakers 3 can be turned off. Therefore, it
is possible to finely and variably control the number of powered-off speakers and to further
reduce power consumption.
[0102]
Further, in the present embodiment, the threshold sound pressure may be set differently for a
plurality of speakers, the sound pressure may be compared with the threshold sound pressure
corresponding to each speaker, and the sound pressure is equal to or less than the threshold
sound pressure. In this case, the power of the corresponding speaker may be turned off. This
turns off different numbers of speakers depending on the detected sound pressure. Therefore,
with the simple configuration in which the threshold sound pressure is set for each speaker, the
number of powered-off speakers can be finely controlled finely, and power consumption can be
further reduced.
[0103]
Further, in the present embodiment, in the analysis of the sound pressure change tendency, the
determination reference of the sound pressure change tendency corresponding to the noncongested state may be set differently for the plurality of speakers. The sound pressure change
tendency may be analyzed using the criterion corresponding to each speaker. And the power
supply of the speaker corresponding to the determination result that there is a sound pressure
change tendency corresponding to the non-congested state may be turned off. According to this
configuration, the power supplies of different numbers of speakers 3 are turned off according to
the degree of congestion. With a simple configuration in which the determination reference of
the sound pressure change tendency is set for each of the speakers 3, the number of speakers in
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the power-off state can be variably controlled finely, and power consumption can be further
reduced.
[0104]
Next, a further modification of the above-described embodiment will be described. In the above
embodiment, the speaker 3 is connected to the analog line. In a variant, network speakers may be
used. The network speaker is connected to the system control unit via a network such as a LAN.
Voice is transmitted in the form of digital signals. Voice and control signals are transmitted over
the network, which can reduce the number of wires.
[0105]
Further, in the above-described embodiment, the sound pressure of the sound amplification area
is used as the congestion degree parameter, and the congestion degree is determined. However,
the present invention is not limited to such a configuration. Parameters other than sound
pressure may be used.
[0106]
For example, surveillance cameras are installed in each of the sound amplification areas. Video
data of the sound amplification area is collected using a surveillance camera. The video data is
input to the system control unit 9 and processed. The degree of congestion can be determined by
analyzing the video data. For example, a person in video data is detected. Then, the number of
persons or the density is detected as the congestion degree parameter, and is used to determine
the congestion degree. The number of persons or the density may be compared to a
predetermined threshold. If the number of persons or the density is equal to or less than the
threshold value, the congestion degree determination unit may determine that the sound
amplification area is in a non-congested state.
[0107]
Further, for example, a temperature sensor may be provided, and the measured temperature may
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30
be input to the system control unit 9 and used as a congestion degree parameter. The congestion
degree determination unit may compare the measured temperature with a predetermined
threshold temperature, and determine that the loud speaker area is in the non-congested state
when the measured temperature is equal to or less than the threshold temperature. The
threshold temperature may be set differently for each floor and each loud sound area. Also, a
pressure sensor may be used instead of the temperature sensor. The collected pressure data may
be analyzed as a congestion degree parameter and compared to a threshold to determine the
congestion degree. Furthermore, the above-described plurality of types of parameters may be
combined and used to determine the degree of congestion.
[0108]
The preferred embodiments of the present invention have been described above. However, the
present invention is not limited to the above-described embodiment, and it goes without saying
that those skilled in the art can modify the above-described embodiment within the scope of the
present invention.
[0109]
As described above, the loudspeaker system according to the present invention has the effect of
being able to reduce power consumption when the loudspeaker area is not crowded, and is useful
as a business broadcast facility or the like.
[0110]
A diagram showing a configuration of a loudspeaker system according to a first embodiment of
the present invention. A diagram showing a configuration of a system control unit. A diagram
depicting an operation of a loudspeaker system according to a first embodiment of the present
invention. The figure which shows the structure of the system control part in an embodiment The
figure which shows the operation | movement of the loudspeaker system in a 2nd embodiment
The figure which shows the composition of the loudspeaker system according to a 3rd
embodiment of the present invention Diagram showing an example of the facility where the
system is installed Diagram showing the control situation of each speaker when the threshold
sound pressure is different among a plurality of speakers Diagram showing the power saving
effect according to the embodiment of the present invention
Explanation of sign
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[0111]
DESCRIPTION OF SYMBOLS 1 Loud sound system 3 Speaker 9 System control part 11 Speaker
line 13 Control line 15 Sound line for sound collection 21 Congestion degree detection part 23
Congestion degree judgment part 25 Speaker power control part 33 Sound pressure calculation
processing part 35 Averaging processing part 41 Calculation result Storage unit 43 Threshold
sound pressure storage unit
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