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DESCRIPTION JP2007318317

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DESCRIPTION JP2007318317
An object of the present invention is to provide a loudspeaker system for performing a
loudspeaker broadcasting with a proper loudspeaker volume according to an approaching person
even using one loudspeaker. A loudspeaker system includes a loudspeaker driven by an electric
signal to emit sound, two cameras for photographing a person whose optical axis is directed in
the same direction and enters a loudspeaker broadcast range of the loudspeaker, and An image
analysis apparatus that outputs a control signal according to the distance between the
loudspeaker and a person from an image captured by one camera, and a volume adjustment
apparatus that adjusts the attenuation amount of an electrical signal according to the control
signal. [Selected figure] Figure 1
Loudspeaker system
[0001]
The present invention relates to a loudspeaker system that detects the arrival of a person and
emits voice from a loudspeaker.
[0002]
Conventionally, a loudspeaker system that detects the arrival of a person and guides by voice
includes a loudspeaker that converts an electric signal from a voice amplification device into a
speech signal and broadcasts it, and a human body sensor that detects a person approaching the
loudspeaker. A control device that receives a signal from a human body sensor that detects a
person and transmits a control signal, and a volume control device that attenuates an electrical
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signal from an audio amplification device based on the control signal.
And when a human body sensor detects the person who approaches, it can broadcast on the
appropriate loud-broadcasting broadcast volume according to the person who approaches (for
example, refer patent document 1).
[0003]
JP, 2000-268275, A
[0004]
However, since a human body sensor is used for human detection, there is a problem that the
human detection range is narrow.
In addition, since only volume control can be performed depending on the presence or absence
of a person, there is a problem that when a wide range of loud broadcast broadcasting range is
supported by one loud loudspeaker having a large output, the range in which people can not be
detected becomes wide.
[0005]
An object of the present invention is to provide a loudspeaker system that performs loudspeaker
broadcasting with a proper loudspeaker volume according to the approaching person even using
one loudspeaker.
[0006]
The loudspeaker system according to the present invention comprises a loudspeaker driven by
an electric signal to emit voice, two cameras for photographing a person whose optical axis is
directed in the same direction and enters the loudspeaker broadcast range of the loudspeaker,
and An image analysis apparatus that outputs a control signal according to the distance between
the loudspeaker and a person from an image captured by one camera, and a volume adjustment
apparatus that adjusts the attenuation amount of an electrical signal according to the control
signal.
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[0007]
The effect of the loudspeaker system according to the present invention is to analyze the images
from the two cameras with two cameras whose optical axes are directed in the same direction so
that the position of the person who entered the loudspeaker broadcast range of the loudspeaker
can be determined. Because the attenuation of the electrical signal is adjusted depending on
whether a person is approaching or away from the loudspeaker, the person can hear an
appropriate volume of sound.
[0008]
Embodiment 1
FIG. 1 is a block diagram of a loudspeaker system according to Embodiment 1 of the present
invention.
FIG. 2 is a functional block diagram of the image analysis apparatus according to the first
embodiment.
The loudspeaker system 1 according to the first embodiment of the present invention includes,
as shown in FIG. 1, a loudspeaker 2 for emitting a voice based on an input electrical signal, an
audio amplifier 3 for amplifying an electrical signal, and a broadcast broadcast range. According
to the control signals from the image analysis device 5 that transmits a control signal according
to the movement distance of the input from the images captured by the cameras 4a and 4b that
capture the entered person, the camera 4a and 4b A volume adjuster 6 is provided to attenuate
the signal.
[0009]
The sound emitted by the loudspeaker 2 reaches a conical loudspeaker broadcast range with the
loudspeaker 2 at the top. The two cameras 4a and 4b are installed near the ground where the
cone of the broadcast broadcast range crosses, that is, the state of the shooting area from the
ground to the height of the height of a person. The cameras 4a and 4b are separated by a
predetermined distance, and the optical axes of the cameras 4a and 4b are substantially parallel.
The cameras 4 a and 4 b periodically and simultaneously capture an imaging region at a
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predetermined cycle and transmit an image to the image analysis device 5.
[0010]
As shown in FIG. 2, the image analysis device 5 uses a feature from the two images taken by the
cameras 4a and 4b and the storage means 11 in which the distance between the loudspeaker 2
and the person obtained for each cycle is stored as shown in FIG. The distance calculating unit 12
calculates the position of the person in the coordinate system set on the imaging area, obtains
the distance between the position and the loudspeaker 2, and stores the distance in the storage
unit 11. The distance between the position of the person determined from the captured image
and the loudspeaker 2 is read out from the storage means 11, and the movement distance
traveled by the person during one cycle is determined, and the volume reduction command is It
has volume setting means 13 for transmitting a volume increase command to the volume
adjustment device 6 when the distance is increased.
[0011]
When receiving the volume reduction command or the volume increase command from the
image analysis device 5, the volume adjustment device 6 adjusts the attenuation amount of the
electric signal transmitted from the audio amplification device 3 and transmits it to the
loudspeaker 2.
The loudspeaker 2 is driven by the electric signal attenuated by the volume adjuster 6 to emit
sound.
[0012]
The loudspeaker system 1 according to the first embodiment includes two cameras 4a and 4b
whose optical axes are directed in the same direction so that the position of a person who enters
the loudspeaker broadcast range of the loudspeaker 2 can be obtained. By analyzing the images
from the two cameras 4a and 4b and adjusting the amount of attenuation of the electrical signal
depending on whether the person is approaching or away from the loudspeaker 2, the person
can hear the sound of an appropriate volume .
[0013]
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Although the loudspeaker system 1 according to the first embodiment has been described as an
example in which the loudspeaker 2 is installed outdoors, the same effect can be obtained by
installing the loudspeaker 2 indoors or the like.
Further, although it has been described that one loudspeaker 2 is installed, a plurality of
loudspeakers 2 may be installed. At this time, the broadcast broadcast range of each loudspeaker
2 may be photographed by the two cameras 4a and 4b.
[0014]
Second Embodiment FIG. 3 is a block diagram of a loudspeaker system according to Embodiment
2 of the present invention. In a loudspeaker system 1B according to a second embodiment of the
present invention, a microphone 7 connected to the audio amplification device 3 is added to the
loudspeaker system 1 according to the first embodiment, and the image analysis device 5B is
different accordingly. The other parts are the same, so the same reference numerals are added to
the same parts and the description is omitted. When a person carrying the microphone 7 enters
the broadcast broadcast area, the image analysis device 5B according to the second embodiment
calculates the position of the person and obtains the distance to the loudspeaker 2. Then, when a
person is approaching, the volume reduction command is sent to the volume adjustment device 6
so that the volume of the loudspeaker 2 is decreased, and when the person is going away, the
volume increase command is increased. Send.
[0015]
As in the first embodiment, the loudspeaker system 1B according to the second embodiment can
allow a person to hear a sound with an appropriate volume and can suppress howling.
[0016]
Third Embodiment
FIG. 4 is a block diagram of a loudspeaker system according to Embodiment 3 of the present
invention. In the loud-sound system 1C according to the third embodiment of the present
invention, the voice output device 8 is added to the loud-sound system 1 according to the first
embodiment, and accordingly the image analysis device 5C is different. The same reference
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numerals will be added to similar parts and the description will be omitted. The image analysis
device 5C according to the third embodiment distinguishes a person who has entered the loud
broadcast area into a person who is registered in advance and a suspicious person, and in the
case of a person who is registered, as in the first embodiment. , Volume decrease command or
volume increase command to the volume adjustment device 6.
[0017]
On the other hand, in the case of a suspicious person, an intrusion warning command is sent to
the voice output device 8 and a volume increase command is sent to the volume adjustment
device 6 when the distance to the loudspeaker 2 is short. When the voice output device 8
receives the intrusion warning command, the voice output device 8 switches the connection of
the volume adjustment device 6 with the voice amplification device 3 and connects it to the alert
sound source 9 incorporating the volume adjustment device 6. As such, when the warning sound
source 9 is connected to the volume adjustment device 6, an intrusion warning broadcast is
performed from the loudspeaker 2.
[0018]
As in the first embodiment, the loud-sounding system 1C according to the third embodiment can
allow a person to hear an appropriate volume of sound and, when a suspicious person intrudes
into the loud-speaking broadcast area, Can be intimidated. Further, as the closer to the
loudspeaker 2, the warning broadcast of a loud volume is performed to the suspicious person, it
is possible to intimidate more.
[0019]
It is a block diagram of the loudspeaker system concerning Embodiment 1 of this invention. FIG.
1 is a functional block diagram of an image analysis apparatus according to Embodiment 1; It is a
block diagram of the loud-sound system concerning Embodiment 2 of this invention. It is a block
diagram of the loud-sound system concerning Embodiment 3 of this invention.
Explanation of sign
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[0020]
1, 1B, 1C Loudspeaker System, 2 Loudspeaker, 3 Voice Amplifier, 4a, 4b Camera, 5, 5B, 5C Image
Analysis Device, 6 Volume Control Device, 7 Microphone, 8 Voice Output Device, 9 Warning
Sound Source, 11 Memory Means, 12 distance calculation means, 13 volume setting means.
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