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JP2006157403

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DESCRIPTION JP2006157403
PROBLEM TO BE SOLVED: To provide a bus stop loudspeaker apparatus capable of preventing
voice diffusion to the surroundings and simultaneously broadcasting plural kinds of voices.
SOLUTION: A modulator 22 modulates a carrier wave belonging to an ultrasonic band by an
audible sound signal, and the modulated signal from the modulator 22 is emitted as a
superdirective sound wave, and an audible sound is emitted via the superdirective sound wave.
And a plurality of voice guidance data, and audible from the human presence sensor, the
parametric speaker 10 for transmitting information, the human presence sensor 11 for sensing
that a human has entered the audible area 30 where the audible sound from the parametric
speaker 10 reaches. When a signal indicating that a person has entered the area is received,
voice guidance data corresponding to the signal is selected, converted into an audible sound
signal, and a voice control unit 21 supplied to the modulator 22 is provided. [Selected figure]
Figure 1
Loudspeaker for bus stops
[0001]
BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a bus
stop loudspeaker installed at a bus stop and providing voice guidance.
[0002]
FIG. 3 is a view for explaining an example of installation of a conventional bus stop loudspeaker.
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As shown in the figure, the bus stop loudspeaker system is installed at a bus stop 100 provided
with a timetable 101, a guide plate 102 and the like. The dynamic speaker 201 of the bus stop
loudspeaker is installed on the roof 103 of the bus stop 100 and generates a radiation sound
202. The radiation sound 202 from the dynamic speaker 201 is diffused and transmitted in and
around the bus stop 100. Prior art in the art includes, for example, Patent Document 1.
[0003]
JP 2000-402916 A
[0004]
As described above, since the conventional bus stop loud speaker radiates sound from the
dynamic speaker 201, the radiated sound 202 is diffused to the surroundings as shown in FIG. 3
in the surrounding residential area where the bus stop 100 is installed. It was a noise.
Accordingly, there is a problem that the place where the bus stop loudspeaker can be installed is
limited. Also, if a plurality of dynamic speakers are installed at the bus stop 100 and different
voice guidance messages are broadcast simultaneously from each other, the voice guidance
messages will be mixed, so it is not possible to simultaneously broadcast multiple types of voice
guidance messages. There was a problem.
[0005]
The present invention has been made to solve the problems as described above, and it is an
object of the present invention to provide a bus stop loud-speaking device capable of preventing
voice diffusion to the surroundings and simultaneously broadcasting plural types of voices. Do.
[0006]
A bus stop loudspeaker system according to the present invention comprises a modulator for
modulating a carrier wave belonging to an ultrasonic band by an audible sound signal, and emits
a modulation signal from the modulator as a superdirective sound wave, and the superdirective
sound wave. A parametric speaker for transmitting audible sound through the human body, a
human sensor for detecting that a human has entered an audible area reached by the audible
sound from the parametric speaker, a plurality of voice guidance data, and audio from the human
sensor When a signal indicating that a person has entered the area is received, voice guidance
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data corresponding to the signal is selected, converted into an audible sound signal, and a voice
control unit to be supplied to the modulator.
[0007]
According to the present invention, the bus stop loudspeaker includes a modulator for
modulating a carrier wave belonging to the ultrasonic band by an audible sound signal, and emits
the modulation signal from the modulator as a superdirective sound wave, A human-body sensor
that holds a parametric speaker that transmits an audible sound through sound waves, a human
sensor that detects that a human has entered an audible area where the audible sound from the
parametric speaker reaches, and a plurality of voice guidance data Since the voice guidance data
corresponding to the signal is selected and converted into an audible sound signal when the
signal indicating that a human has entered the audible area is received from the audio signal, the
voice control unit to be supplied to the modulator is provided. Therefore, there is an effect that it
is possible to obtain a bus stop loud-speaking device capable of preventing voice diffusion to the
surroundings and simultaneously broadcasting plural kinds of voices.
[0008]
Embodiment 1
FIG. 1 is a block diagram of a bus stop loudspeaker system according to a first embodiment of
the present invention.
As shown in the figure, the bus stop loudspeaker includes parametric speakers 10 and 10 ′ and
a processing unit 20.
The processing device 20 includes an audio control unit 21, modulators 22 and 22 ′, and an
amplifier 23. The parametric speakers 10, 10 'are provided with human sensors 11, 11'
respectively.
[0009]
FIG. 2 is a view showing an installation example of a bus stop loudspeaker. As shown in the
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figure, the bus stop loudspeaker system is installed at the bus stop 100 where the timetable 101,
the guide plate 102 and the like are installed. The parametric speakers 10 and 10 'serving as
radiators are stored on the roof 103 of the bus stop 100, and radiate sound from the roof to the
ground to a place where voice guidance is required such as the timetable 101 and the place
where the guide plate 102 is installed. To be installed. Alternatively, the timetable 101 may be
installed on the ground near the guide plate 102 so as to emit sound toward the roof 103. The
parametric speakers 10, 10 'respectively transmit sound only to the audible areas 30, 30'.
Although two parametric speakers 10 and 10 'and their corresponding modulators 22 and 22'
are provided here, the number of each may be increased or decreased as desired. Although not
shown, the processing device 20 may be housed in the roof 103 or installed on the ground.
[0010]
The human sensor 11, 11 'is a sensor that detects that a human has entered the audible area 30,
30' of the audio of the parametric speaker 10, 10 ', and if so, the voice controller 21 notifies that
effect. This signal is supplied as an external control signal 24. The voice control unit 21 holds a
plurality of voice guidance messages to be reproduced, and selects an appropriate voice guidance
message according to the external control signal 24 received as described above. For example, in
FIG. 1, when a person reads the timetable 101, the human sensor 11 senses the person and
supplies it as an external control signal 24 to the voice control unit 21. Based on the received
external control signal 24, the voice control unit 21 determines that the signal is from the human
sensor 11 installed at the top of the timetable 101, and a voice guidance message suitable for the
person reading the timetable 101 is selected. select. Further, when the voice control unit 21
receives the external control signal 24 from the human sensor 11 'installed on the upper portion
of the guide plate 102, the voice control unit 21 selects a sightseeing guide message or the like.
[0011]
The voice control unit 21 converts the selected voice guidance message into an audible sound
signal and supplies it to the modulator 22 or 22 'according to the audible sound signal. The
modulators 22, 22 'modulate the carrier wave of the ultrasound band with the received audible
sound signal and send the modulated signal to the amplifier 23. The amplifier 23 amplifies the
received modulated signal and supplies it to the corresponding parametric speaker 10 or 10 '.
The parametric speaker 10 or 10 'emits the received modulated signal into the air as a
superdirective sound wave. An audible sound is transmitted via this super-directional sound
wave. The voice guidance message to be emitted is highly directional, leaving the characteristics
of the ultrasonic waves, and the voice can be heard only in the audible area 30 or 30 '.
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[0012]
As described above, according to the first embodiment, the parametric speakers 10 and 10 'are
installed on the ceiling portion of the bus stop 100 where voice guidance is required, and the
voice control unit 21 selects the voice guidance message according to the location. Since the
modulators 22, 22 'modulate the carrier wave in the ultrasonic band with an audible sound
signal and the parametric speakers 10, 10' emit super-directional sound waves, the voice
guidance message is only in a certain range. It is transmitted and the effect that noise is not
produced in the surrounding environment of bus stop 100, such as a residential area, is acquired.
Further, by installing a plurality of parametric speakers 10, 10 ', it is possible to obtain an effect
that it is possible to simultaneously broadcast a plurality of different voice guidance messages
according to the installation location without mixing of voices.
[0013]
It is a block diagram of the loud-speaking device for bus stops by Embodiment 1 of this
invention. It is a figure which shows the example of installation of the loudspeaker apparatus for
bus stops by the Embodiment 1. FIG. It is a figure which shows the example of installation of the
conventional loudspeaker system for bus stops.
Explanation of sign
[0014]
10, 10 'parametric speaker, 11, 11' motion sensor, 20 processor, 21 voice control unit, 22, 22
'modulator, 23 amplifier, 24 external control signal, 30, 30' audible area, 100 bus stop, 101
Timetable, 102 guide plate, 103 roof, 201 dynamic speaker, 202 radiation sound.
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