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JP2013041311

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DESCRIPTION JP2013041311
Abstract: [Problem] To realize an output level of voice that promptly responds to the
environment in a voice notification device used for regional public relations. SOLUTION: A noise
level detecting means 22 for predicting or detecting a noise level in the surrounding environment
in a period when no sound is outputted from a speaker, a variable gain amplifier 15 for
amplifying a signal outputted to a speaker 18, and a center 30 Emergency control means for
controlling the gain of the variable gain amplifier to a reference value regardless of the output of
the noise level detection means to make the output of the speaker the maximum audio level
regardless of the output of the noise level detection means Have. If not the emergency
information, when the noise level is above the predetermined value, the gain of the variable gain
amplifier is increased by one step from the reference value, and the output of the speaker is
increased by one step from the sound level based on the signal transmitted from the center. The
voice level you When the noise level is less than the predetermined value, the gain of the variable
gain amplifier is used as a reference value, and the output of the speaker is used as the sound
level based on the transmission signal. [Selected figure] Figure 1
Voice notification device
[0001]
The present invention relates to an apparatus for performing general public information by voice
in a predetermined area or notifying of emergency information such as earthquake occurrence,
tsunami incident, landslide, river flood, etc. in a predetermined area from a speaker installed at
high place such as a telephone pole outdoors.
[0002]
09-05-2019
1
The techniques described in the following Patent Documents 1 to 3 are known as a system for
publicizing to local residents.
Patent Document 1 discloses a technique for attaching a device for notifying a person of
emergency information by voice output of character information to a pole of a bus stop, instead
of a siren or a public announcement of a loudspeaker. Moreover, in patent document 2, attaching
an apparatus which alert | reports the emergency alert by character information and an audio |
voice output similarly to a telephone pole or a telephone line support | pillar is disclosed.
Further, Patent Document 3 discloses a device in which a voice synthesizer and a voice output
device are arranged in each PHS base station, and voice output of disaster prevention
information is made to an area around the base station using a public line.
[0003]
In particular, outdoor loudspeakers are conventionally known that attach speakers to telephone
poles and telephone poles and voice output of emergency information from local governments. In
general, this outdoor sound amplification device is a device that broadcasts various general
public information and emergency information acoustically from a trumpet speaker and
transmits the information to people in the vicinity.
[0004]
JP, 2010-102279, JP, 2010-44341, JP, 2002-24974
[0005]
However, according to the conventional outdoor loudspeaker system, the voices are output at a
constant volume, so the residents of the house approaching the speaker are noisy and the
residents of the house far from the speaker can not hear the information. There is.
These unheard complaints occur on windy or rainy days or areas with high vehicle traffic. On the
contrary, in the case of nighttime, the residents of the house approaching the speaker complain
that the sound is loud.
09-05-2019
2
[0006]
In order to solve this problem, four speakers are provided in four directions, and the output level
of the amplifier is adjusted and the direction of each speaker is adjusted for each speaker.
However, these adjustments alone are not sufficient and can not solve the problems that occur in
the above case.
[0007]
Therefore, the present invention has been made to solve these problems, and its object is to
realize that the output level is promptly adapted to the environment, so that the voice output is
loud and the voice output can not be heard. It is to prevent.
[0008]
According to a first aspect of the present invention for solving the above-mentioned problems,
according to a signal transmitted from a center, an audio notification apparatus is configured to
output audio from a speaker arranged at a high place to an area controlled by the speaker. ,
Noise level detection means for predicting or detecting the noise level in the surrounding
environment during a period in which no sound is output from the speaker, a variable gain
amplifier for amplifying the signal output to the speaker, and a signal transmitted from the
center is urgent In the case of information, regardless of the output of the noise level detection
means, the gain of the variable gain amplifier is controlled to the reference value to make the
output of the speaker the maximum audio level; When the signal is not emergency information,
when the noise level obtained by the noise level detection means is above a predetermined value,
the gain of the variable gain amplifier is referred to The sound level of the speaker is increased
by one step from the sound level based on the signal transmitted from the center by one step
increase, and variable if the noise level obtained by the noise level detection means is less than a
predetermined value. And a first level control means for setting a gain of the gain amplifier as a
reference value and an audio level based on a signal transmitted from the center as an output of
the speaker.
[0009]
The installation position of the present apparatus is a telephone pole, a telephone line support, or
a high place such as a roof or a roof of a house, but is not particularly limited.
09-05-2019
3
The number of installed speakers is arbitrary and is one or more.
In a plurality of cases, usually, the orientation is changed. For example, four speakers may be
installed in four directions of north, south, east, and west. The orientation of the speakers may be
changeable or fixed. When a plurality of speakers are provided, the volume may be changed
commonly, or may be changed for each speaker according to the environment controlled by each
speaker. The number of stages of the level of the audio signal transmitted by the center is
arbitrary.
[0010]
According to a second invention, in the first invention, a time zone setting means for setting a
daytime time zone which is a nighttime time zone or a time zone other than the nighttime time
zone, and when the signal transmitted from the center is not emergency information. When it is
determined that the current time is in the nighttime zone according to the time zone set in the
time zone setting means, the gain of the variable gain amplifier is decreased by one step from the
gain set by the first level control means. The output of the speaker is reduced by one step from
the sound level controlled by the first level control means, and it is determined that the current
time is determined to be present in the daytime time zone according to the time zone set in the
time zone setting means. And second level control means for causing the output of the speaker to
be an audio level controlled by the first level control means without changing the gain of the gain
amplifier. When the signal transmitted from the terminal is emergency information, the gain of
the variable gain amplifier is selected regardless of whether the current time belongs to the
nighttime zone set in the time zone setting means or the daytime zone. It is characterized in that
it is controlled to a reference value to make the output of the speaker the maximum audio level.
[0011]
The night time zone may be set variably.
In addition, the night time zone may be changed according to the season. In the present
invention, the gain is further reduced by one step in the night time zone, as compared with the
setting of the gain of the variable gain amplifier according to the noise level of the environment
according to the first invention. As a result, when the environment is quieter than the daytime
such as nighttime, the volume of the speaker is reduced, so that the notification of the normal
09-05-2019
4
information does not become noise.
[0012]
In the first and second aspects of the invention, the power supply control means may be provided
for supplying power to the variable gain amplifier only in the audio output period based on the
data signal indicating the audio output period included in the signal transmitted from the center.
Further, an audio level detection means for detecting an activation sound and an audio output
from the speaker when power supply to the speaker is started by a data signal indicating an
audio output period included in a signal transmitted from the center, and an audio level detection
means When the start-up sound is detected, power supply to the variable gain amplifier is
started, and power supply to the variable gain amplifier is continued when a period in which the
audio level detected by the audio level detection means is below the predetermined level
continues for a predetermined time. Power supply control means may be provided to stop the
power supply.
[0013]
In the above invention, the variable gain amplifier may be composed of a fixed gain amplifier and
a variable attenuator provided in front of the amplifier. Also, the noise level detection means can
be a noise sensor that detects the noise level of the environment. The noise level detection means
can also be means for detecting the wind speed or rainfall of the environment and predicting the
noise level of the environment from the wind speed or rainfall.
[0014]
According to the present invention, when the audio signal transmitted from the center is
emergency information, the audio is output from the speaker at the maximum volume without
depending on the noise level of the environment or the night time zone. As a result, in the case of
an emergency, information can be reliably transmitted. In addition, when the audio signal is
ordinary information, the amount of attenuation, that is, the gain of the variable gain amplifier is
appropriately set according to the noise level of the environment and the night time zone. In this
case, in the noise environment, the level of the sound output from the speaker is one step larger
than the sound level output from the center, so that the public information can be transmitted
reliably. Further, in the case of a quiet environment, since a voice of a level corresponding to the
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5
voice level output by the center is output, noise does not occur to the residents. Furthermore, at
night, the level of the sound output from the speaker is one step smaller than the sound level
output from the center, and noise does not occur to the residents. Further, even in the nighttime,
in the case of a noise environment such as strong wind or heavy rain, the level of the sound
output from the speaker is one step lower at night than the sound level output from the center,
and one step larger due to the noise environment. As a result, the sound volume corresponds to
the sound level of the sound signal transmitted by the center, noise does not occur to the
residents, and publicity can be reliably performed.
[0015]
BRIEF DESCRIPTION OF THE DRAWINGS The block diagram which showed the audio | voice
alerting | reporting apparatus based on one Example of this invention. The flowchart which
showed the processing procedure of CPU of a voice information device. Explanatory drawing
which showed the relationship between the classification of the audio | voice signal transmitted
from a center, an audio | voice level, and the attenuation amount set to the variable attenuator of
an audio | voice alerting device, and the output level of a speaker.
[0016]
Hereinafter, the present invention will be described based on specific examples. The present
invention is not limited to the following examples.
[0017]
FIG. 1 is a block diagram of the voice notification device 1 according to the present embodiment.
The voice notification device 1 is attached to a telephone pole installed in a local government
area, a pillar such as a telephone pole, or a high place of a building or a house. The MCA receiver
10 is a device that receives a radio signal from the center 30 and outputs sound from the
speaker 18. The audio signal output terminal A of the MCA receiver 10 is input to the variable
attenuator 12, and the variable attenuator 12 is provided at the input stage of the amplifier 14.
The variable attenuator 12 and the amplifier 14 constitute a variable gain amplifier 15. The
output of the amplifier 14 is input to the drive amplifier 16, and the speaker 18 is driven by the
drive amplifier 16 to output sound from the speaker 18. The gains of the amplifier 14 and the
drive amplifier 16 are fixed.
09-05-2019
6
[0018]
In addition, the MCA receiver 10 demodulates the data signal among the signals transmitted by
the center 30, and outputs from the data terminal B a signal indicating the type of the
transmitted signal, whether the signal is emergency information or not. Be done. That is, in the
case of emergency information, the data terminal B is at H level, and in the case of normal
information, the data terminal B is at L level. Further, the signal transmitted from the center 30
includes information indicating the broadcast start indicating the output period of the audio
information and the timing of the broadcast end. The MCA receiver 10 demodulates this output
period information, and the data terminal C outputs an output period signal that becomes H level
between the broadcast start time and the broadcast end time. The type signal from the data
terminal B of the MCA receiver 10 is input to the CPU 20.
[0019]
Further, to the CPU 20, an output signal of the noise level detector 22 for detecting the noise
level of the environment in which the voice notification device 1 is installed is inputted. In
addition, a memory 24 for storing data of a nighttime zone or a daytime zone is connected to the
CPU 20, and the PC 26 can newly set the time zone or change the time zone. Further, the
threshold value of the noise level output from the noise level detector 22 can be set in the
memory 24 using the PC 26.
[0020]
The CPU 20 is a type signal indicating whether it is emergency information output from the dirt
terminal B of the MCA receiver 10 or normal information, a noise level output from the noise
level detector 22, and whether the current time exists in the nighttime zone The amount of
attenuation of the variable attenuator 12 is variably set based on the parameter. The output
period signal output from the data terminal C of the MCA receiver 10 is input to the control
terminals of the relays 29 and 28 for supplying power to the CPU 29, the amplifier 14 and the
drive amplifier 16. Therefore, power is supplied to the CPU 29, the amplifier 14 and the drive
amplifier 16 during the period when the voltage level of the data terminal C is H level, that is, the
period from the broadcast start time to the broadcast end time. The noise level detector 22 and
the memory 24 are supplied with power from the CPU 20. Further, the audio signal included in
09-05-2019
7
the signal transmitted from the center 30 is supplied to the CPU 29, the amplifier 14 and the
drive amplifier 16 after the rise of the output period signal, that is, the broadcast start signal is
output. It is sent after the delay time to become operational.
[0021]
Also, there are four speakers 18, each of which is disposed in four directions orthogonal to one
another in a horizontal plane. The variable gain amplifier 15, the drive amplifier 16, the speaker
18, and the relay 28 form one set for four channels, and the four speakers described above are
configured to be driven with independent attenuation amounts.
[0022]
Next, the operation of the voice notification device 1 will be described based on the flowchart of
FIG. 2 showing the control procedure of the CPU 20. First, the sound level of the sound signal
transmitted from the center 30 is divided into three steps of 3 dB. The voice information is
divided into types such as emergency information requiring emergency notification such as
arrival of earthquake waves and tsunami, occurrence of fire, etc. and normal information for the
purpose of publicity without urgency. The emergency information has the highest level of the
voice signal, and the normal information is divided into two stages of middle and low levels.
Specifically, the level of the voice signal of the emergency information is 0 dB, and the normal
information is two types of -3 dB and -6 dB.
[0023]
When power is supplied to the CPU 20, this program is activated. In step 100, the attenuation
amount D of the variable attenuator 12 is set to the reference value D0. The reference value D0 is
set to -3 dB. In the following description, the attenuation is represented by a negative value, the
magnitude of the attenuation means an absolute value of the negative value, and the increase of
the attenuation is an increase of the absolute value of the negative value, the attenuation A
decrease is intended to mean a decrease in the absolute value of a negative value. The gain of the
amplifier 14 is fixed at 3 dB. Therefore, when the attenuation amount D of the variable
attenuator 12 is the reference value D0, the gain of the variable gain amplifier 15 is 0 dB, and the
speaker 18 outputs an audio signal output from the audio signal output terminal A of the MAC
receiver 10 Are driven at the level amplified by the gain by the drive amplifier 16.
09-05-2019
8
[0024]
Next, in step 102, the type signal output from the data terminal B of the MAC receiver 10 is read.
Next, in step 104, it is determined whether or not the type signal indicates emergency
information, and if it is emergency information, the process proceeds to step 116 and the
attenuation amount of the variable attenuator 12 is currently set. The attenuation amount D is
set to the reference value D0. Since the gain of the amplifier 14 is fixed at 3 dB, in this case, the
gain of the variable gain amplifier 15 is 0 dB, and the audio signal output from the audio signal
output terminal A of the MCA receiver 10 is amplified by the drive amplifier 16 Then, the
speaker 18 outputs the sound as sound. At this time, the amount of sound output from the
speaker 18 is the maximum volume corresponding to the level of the sound signal of the
emergency information output by the center 30.
[0025]
On the other hand, when it is determined in step 104 that the type signal is normal information,
the process proceeds to step 106 and the noise level detector 22 detects the noise level of the
environment. Since this noise level is detected before the voice is output from the speaker 18, the
sound pressure due to the voice output is not detected as noise.
[0026]
Next, in step 108, it is determined whether the detected noise level is equal to or greater than a
threshold Th. If the noise level is equal to or higher than the threshold value Th, at step 110, the
attenuation amount D of the variable attenuator 12 is decreased by the correction attenuation
amount Δ with respect to the currently set value. The correction attenuation amount Δ is set to
−3 dB. Therefore, in this case, the attenuation amount D is a value smaller than the reference
value D0 by 3 dB, that is, 0 dB. When the noise level is less than the threshold Th, the correction
of the attenuation amount D is not performed, and the process proceeds to step 112. Therefore,
in this case, the attenuation amount D is the reference value D0.
[0027]
09-05-2019
9
Next, at step 112, it is judged if the current time belongs to the nighttime zone set in the
nighttime zone memory 241 in the memory 24 or not. If the current time belongs to the
nighttime zone, at step 114, the attenuation amount D of the variable attenuator 12 is increased
by the correction attenuation amount Δ with respect to the value currently set. That is, when the
noise level is equal to or higher than the threshold value Th, the currently set attenuation amount
D is 0 dB, so the attenuation amount D is increased by the correction attenuation amount Δ and
becomes −3 dB. When the noise level is less than the threshold Th, the currently set attenuation
D is -3 dB of the reference value D0, so the attenuation D is increased by the correction
attenuation Δ to be -6 dB. .
[0028]
If it is determined in step 112 that the current time belongs to a daytime zone other than the
nighttime zone, the correction of the attenuation amount D is not performed, and the process
proceeds to step 116. That is, the attenuation amount D is a value obtained by performing only
the correction of the attenuation amount of the noise level without performing the correction of
the attenuation amount of the current time.
[0029]
Next, at step 116, the attenuation amount D is set to the variable attenuators 12 of the four
channels CH1 to CH4. The variable attenuator 12 is formed of a resistor ladder circuit in which
resistors are connected in parallel, and is a circuit that controls energization of each resistor by a
switch (relay, varactor diode). The amount of attenuation of the variable attenuator 12 is variably
set by selection of parallel circuits with different resistance values.
[0030]
When the data terminal C of the MCA receiver 10 transitions from L level to H level, that is, the
relay 29 is turned on at the broadcast start time, and the CPU 20 is powered, the program of FIG.
2 is executed. In step 116, the center 30 outputs the broadcast start signal (transition of the
output period signal to the H level) until the attenuation amount D is set to the variable
attenuator 12, and the voice signal is output. It is a time shorter than the delay time of Therefore,
after the attenuation amount D determined in accordance with the noise level of the environment
09-05-2019
10
and the time zone is set in the variable attenuator 12, an audio signal is output from the audio
signal output terminal A of the MCA receiver 10. As a result, the speaker 18 outputs sound at a
level according to the set attenuation amount D.
[0031]
The center 30 outputs the broadcast end signal (transition of the output period signal to L level)
after the output of the audio signal is completed and a certain delay time, and the voltage of the
data terminal C of the MCA receiver 10 is L Transition to the level. As a result, the relays 29 and
28 are turned off, power supply to the CPU 20, the amplifier 14 and the drive amplifier 16 is
stopped, and the voice notification is ended.
[0032]
Each time a voice signal is transmitted from the center 30, the above-described feeding, setting of
the attenuation amount, and feeding stop are performed. The emergency control means is
realized by the CPU 20 and the processing steps 102, 104 and 116 of the CPU 20. The first level
control means is realized by the CPU 20 and the processing steps 106 to 110 and 116 of the
CPU 20. The second level control means is realized by the CPU 20 and the processing steps 112
to 116 of the CPU 20. The feed control means comprises the MCA receiver 10, its data terminal
B, and the relays 28 and 29.
[0033]
Next, when the voice signal transmitted from the center 30 is emergency information or normal
information (two-step voice level), the daytime zone, the nighttime zone, the noise level is above
the threshold Th, and the noise level is below the threshold Th The value of the attenuation
amount D set in the attenuator 12 and the sound level output from the speaker 18 are shown in
FIG. However, the audio level output from the speaker 18 is represented by a relative level with
reference to 0 dB as the audio level when the audio of the emergency information is output from
the speaker 18 as 0 dB.
[0034]
09-05-2019
11
In this embodiment, by adopting the above-described configuration, when the audio signal
transmitted from the center 30 is emergency information, the speaker can operate at the
maximum volume without depending on the noise level of the environment or the night time
zone. Audio is output from 18. As a result, in the case of an emergency, information can be
reliably transmitted. Also, when the audio signal is normal information, the amount of
attenuation, that is, the gain of the variable gain amplifier 15 is appropriately set according to
the noise level of the environment and the night time zone. In this case, in the noise environment,
the level of the sound output from the speaker 18 is one step larger than the sound level output
from the center 30, and the public information can be reliably transmitted. Further, in the case of
a quiet environment, since a voice of a level corresponding to the voice level output by the center
30 is output, noise does not occur to the residents. Furthermore, at night, the level of the sound
output from the speaker 18 is one step smaller than the sound level output from the center 30,
and noise does not occur to the residents. Further, even in the nighttime, in the case of a noise
environment such as strong wind or heavy rain, the level of the sound output from the speaker
18 becomes one step smaller at night than the sound level output from the center 30, and one
step larger depending on the noise environment. As a result, the volume of the sound signal
transmitted by the center 30 corresponds to the sound level, noise does not occur to the
residents, and publicity can be reliably performed.
[0035]
[Modification] A modification of the above embodiment will be described below. Instead of the
noise level detector 22, a rain gauge or an anemometer may be used. That is, the noise level may
be calculated by the CPU 20 from the detected rainfall per unit time, and this value may be used
as the noise level detected in the above embodiment. Also in the case of an anemometer, since
the wind speed and the noise level are correlated, the CPU 20 may calculate the noise level from
the detected wind speed, and this value may be used as the noise level detected in the above
embodiment.
[0036]
The output period signal output from the data terminal C of the MAC receiver 10 is input to the
control terminals of the relays 29 and 28 to directly control the power supply to the CPU 20, the
amplifier 14, and the drive amplifier 16. A signal may be input to the CPU 20, and power supply
to the amplifier 14 and the drive amplifier 16 may be controlled by an output signal from the
CPU 20. In this case, power may be constantly supplied to the CPU 20, or only power supply to
09-05-2019
12
the CPU 20 may be controlled by turning on and off the relay 29 with an output period signal.
Although four CHs are used in the above embodiment, only one variable gain amplifier 15 and
one relay 28 may be provided in common. The number of CHs and the number of speakers 18
may be any one or more than one.
[0037]
Furthermore, a wind direction detector is provided to determine the direction of wind up and
wind down, and to the speaker facing the wind down, the attenuation amount is increased by one
step and the output volume is decreased by one step, conversely, wind up The amount of
attenuation may be decreased by one step and the volume of the output may be increased by one
step.
[0038]
In addition, some MCA receivers include an integrated drive amplifier 16.
This device is provided with only an audio signal output terminal and an audio signal input
terminal, and is usually a device in which the output terminal and the input terminal are
connected by a U-turn jack. When this integrated MCA receiver is used, the U-turn jack is
removed, the audio output terminal is connected to the variable attenuator 12 of FIG. 1, and the
output of the amplifier 14 is connected to the audio signal input terminal. . As a result, the audio
signal output from the MCA receiver passes through the variable attenuator 12 and the amplifier
14, is amplified by a predetermined gain, and is then input to the drive amplifier 16 via the audio
signal input terminal. . Thus, the received audio signal can be amplified and output from the
speaker 18.
[0039]
When this device is used in the receiver, the output period signal is not output to the outside of
the receiver, so that the power supply control to the CPU 20 and the amplifier 14 can not be
controlled based on the output period signal. Therefore, the CPU 20 always supplies power and
connects a microphone to the CPU 20. The feed to the drive amplifier is controlled directly by the
MCA receiver, but when the broadcast start signal is input, the drive amplifier is sharply fed, so
that a start-up sound is output from the speaker. This activation sound can be received by the
microphone, and the detection time can be used as the rise of the output period signal, that is,
09-05-2019
13
the broadcast start time. The power may be supplied to the amplifier 14 in synchronization with
the rise of the output period signal. The CPU 20 configures a retriggerable timer by a program
and measures a fixed time. When there is an output from the microphone, that signal is used as a
trigger of the timer. As a result, since the output level of the timer changes after a predetermined
time after the output from the microphone disappears, the power supply may be stopped in
synchronization with the transition of the output level.
[0040]
INDUSTRIAL APPLICABILITY The present invention can be used for a regional disaster
prevention system in which voice notification of emergency information such as an earthquake,
the arrival of a tsunami, occurrence of a fire, and ordinary information for the purpose of general
public information is given to the area.
[0041]
DESCRIPTION OF SYMBOLS 1 ... Audio | voice alerting system 10 ... MCA receiver 20 ... CPU 22 ...
Noise level detector 12 ... Variable attenuator 14 ... Amplifier 15 ... Variable gain amplifier
09-05-2019
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