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DESCRIPTION JP2017076897

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DESCRIPTION JP2017076897
Abstract: The present invention provides an acoustic device that delivers information according
to each listener when the information is transmitted by sound from a moving object to
surrounding listeners. A speaker array (14a, 14b) outputs an audio beam to a listener (P) when
there is a listener (P) in front of the left side of a vehicle. When the listener P is on the left side of
the vehicle, the speaker array 14 b outputs an audio beam to the listener P. When the listener P
is at the left rear of the vehicle, the speaker arrays 14 b and 14 d output an audio beam to the
listener P. [Selected figure] Figure 3
Sound equipment
[0001]
The present invention relates to technology for conveying information using sound.
[0002]
As a technique for transmitting information from a vehicle using sound, for example, there is a
technique described in Patent Document 1.
In the mechanism described in Patent Document 1, interference between the sounds is prevented
by adjusting the volume when simultaneously outputting any two or more of the alarm sound,
the guidance sound, the pseudo engine sound, and the content sound. doing.
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[0003]
JP, 2013-223031, A
[0004]
By the way, in the case where information is transmitted by sound from a moving body such as a
vehicle to surrounding listeners, it is convenient if it becomes possible to distribute information
according to each listener.
The present invention has been made under the above-mentioned background, and in the case of
transmitting information from a moving body to surrounding listeners by sound, it is possible to
distribute information according to each listener. To aim.
[0005]
In order to solve the problems described above, according to the present invention, there is
provided a speaker array device installed in a mobile unit, in which a plurality of speakers are
arranged, and a listener position detection unit for detecting the position of a listener outside the
mobile unit. An audio beam control unit that supplies an audio signal to each of the plurality of
speakers based on the detected position of the listener and causes the speaker array device to
output an audio beam reaching the listener Provide an apparatus.
[0006]
In the above configuration, the audio beam control unit includes: a listener information
acquisition unit that acquires information on the listener; and an information generation unit that
generates information according to the acquired listener information. The information may be
reached by the audio beam to the listener.
[0007]
Furthermore, the information generation unit may generate information according to the listener
information and the position of the listener detected by the listener position detection unit.
[0008]
In addition, storage means in which a predetermined audio signal is stored, and addition means
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for adding the predetermined audio signal read from the storage means and an audio signal
based on the information generated by the information generation unit are provided. The audio
beam control unit may cause the audio signal that has been added by the adding means to reach
the listener by the audio beam.
[0009]
Further, the audio beam control unit may cause the speaker array device to output an audio
beam that reduces the Doppler effect due to a change in time-series distance between the
speaker array device and the listener.
[0010]
According to the present invention, in the case where information is transmitted from a moving
body to surrounding listeners by sound, it is possible to distribute information according to each
listener.
[0011]
1 is a perspective view showing a vehicle according to an embodiment of the present invention.
It is a front view of a speaker array device.
It is the figure which planarly viewed the vehicle from the upper direction, and is a figure which
shows the relationship between a listener and an audio | voice beam.
It is a front view when a vehicle is seen from the front, and is a figure explaining how to fix a
speaker array device.
It is a block diagram which shows the hardware constitutions of a vehicle-mounted acoustic
device.
It is a block diagram which shows the function structure of a vehicle-mounted acoustic
apparatus.
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It is a figure explaining the correspondence of listener information, the relative positional
relationship of a vehicle and a listener, and superposition information. It is a flowchart which
shows operation | movement of a vehicle-mounted acoustic device. It is a figure explaining the
variation of the installation position of a speaker array apparatus. It is a perspective view which
shows the structure of the speaker array apparatus installed in the pillar of a vehicle. FIG. 18 is a
block diagram showing a functional configuration of modification 2; 7 is a flowchart showing the
operation of the modification 2;
[0012]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. [Configuration] FIG. 1 is a perspective view showing a vehicle 100 according to an
embodiment of the present invention. The vehicle 100 is, for example, a four-door sedan type
automobile. The vehicle 100 includes a bonnet 101 in front of the vehicle body, four doors 102
serving as entrances and exits on the side of the vehicle body, a trunk door 103 behind the
vehicle body, and a roof 104 above the vehicle body. Note that left and right expressions used in
the following description mean right and left toward the traveling direction of the vehicle 100.
[0013]
A vehicle 100 is provided with an on-vehicle acoustic device, and speaker array devices 14 a, 14
b, 14 c and 14 d which are components of the on-vehicle acoustic device are provided on the
roof 104. The speaker array devices 14a, 14b, 14c and 14d output voice beams generated in the
form of beams to the outside of the vehicle 100 by providing directivity. The speaker array
devices 14a, 14b, 14c, and 14d are different only in their installation positions and orientations,
and thus are referred to as the speaker array device 14 when they are not distinguished in the
following description.
[0014]
FIG. 2 is a front view of the speaker array device 14. The speaker array device 14 includes a
rectangular parallelepiped housing, and a plurality of speakers 145A, 145B, 145C,..., 145P
arranged in a matrix (row direction and column direction) on the front of the housing. Here, the
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row direction is the horizontal direction when the speaker array device 14 is placed on the
horizontal surface, and the column direction is the vertical direction when the speaker array
device 14 is placed on the horizontal surface. In the present embodiment, three speakers having
the same position in the row direction are represented by any one of the speakers 145A, 145B,
145C,. In the following description, when the speakers 145A, 145B, 145C,..., 145P are not
particularly distinguished, they are referred to as the speakers 145. The arrangement of the
speakers 145 in the speaker array device 14 is not limited to a matrix. For example, the speakers
145 may be arranged in accordance with a predetermined rule such as a honeycomb shape or a
line shape. Further, the number of speakers 145 is not limited to the number shown in FIG.
[0015]
In the present embodiment, the four speaker array devices 14a to 14d are provided on the roof
104 in the arrangement as shown in FIG. The speaker array device 14 a is provided at a position
near the center in the vehicle width direction of the front area of the roof 104. The speaker array
device 14 a is directed forward, and outputs an audio beam mainly to the front of the vehicle
100. The speaker array device 14 b is provided at a position near the center of the left area of
the roof 104 in the vehicle length direction. The speaker array device 14 b is directed to the left
and mainly outputs an audio beam to the left of the vehicle 100. The speaker array device 14 c is
provided at a position near the center of the right area of the roof 104 in the vehicle length
direction. The speaker array device 14 c is directed to the right and mainly outputs an audio
beam to the right of the vehicle 100. The speaker array device 14 d is provided at a position near
the center in the vehicle width direction of the rear area of the roof 104. The speaker array
device 14 d is directed rearward, and outputs an audio beam mainly to the rear of the vehicle
100.
[0016]
The speaker arrays 14a, 14b, 14c and 14d can change the output direction (here, the horizontal
angle) of the audio beam within the range of 0 to 180 degrees along the row direction in the
arrangement of the speakers 145 . In the present embodiment, the output direction of the sound
beam is defined by the “beam output angle”. The beam output angle is represented by the
angle between the face forming the front of the speaker array device 14 and the sound beam. In
addition, the speaker array device 14 can also change the output direction (here, supine angle) of
the sound beam along the column direction in which the speakers 145 are arranged.
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[0017]
In FIG. 3, the broken arrows indicate the path and direction in which the sound beam propagates,
and the sound beam propagates in accordance with the relative position of the listener P outside
the vehicle with respect to the speaker array device 14 Route and direction are different. For
example, when a listener P is present in front of the left of the vehicle 100, the speaker array 14a
outputs an audio beam to the listener P, as shown in FIG. 3 (A). When a listener P is present on
the left side of the vehicle 100, the speaker array 14b outputs an audio beam to the listener P, as
shown in FIG. 3 (B). Further, when the listener P is at the left rear of the vehicle 100, the speaker
array 14d outputs an audio beam to the listener P as shown in FIG. 3 (C). In the arrangement
relationship between the vehicle 100 and the listener P shown in FIG. 3 (A), the speaker array
14b may also be able to emit sounds to the listener P in addition to the speaker array 14a.
Alternatively, only the sound from the speaker array 14b may be used. That is, as long as the
sound beam can be physically output to the listener P, the sound beam may be output from a
speaker array other than the speaker array exemplified above. The same applies to the
arrangement relationship between the vehicle and the listener P shown in FIGS. 3 (B) and 3 (C).
Also, the listener referred to here may be a person who remains within the reachable range of the
sound beam from the vehicle 100 or a person who is passing through the range, and other
moving objects (vehicles Etc.) may be used.
[0018]
The speaker array device 14 is fixed to the roof 104 so that its position does not shift even while
the vehicle 100 is traveling. Specifically, for example, as shown in FIG. 4A, the speaker array
device 14 is a fixture such as a screw or a magnet for the arm 105 fixed to the roof 104 by the
screw 106 so as to sandwich the roof 104 from the left and right. It may be attached using (not
shown). For example, as shown to FIG. 4 (B), the speaker array apparatus 14 may be attached
with respect to the roof 104 by the magnet 107 directly. When the speaker array device is close
to the ground, for example, it may be emitted toward roadside trees and landed objects on the
road, and the sound may not be able to reach the listener. Therefore, the position where the
sound beam can be emitted via the roadside planted trees or the upper side of the ground
contact on the road, which does not significantly impair the design of the vehicle even if the
speaker array device 14 is installed. Specifically, it is desirable that the speaker array device 14
be provided at a position higher than the window provided in the vehicle.
[0019]
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FIG. 5 is a block diagram showing the hardware configuration of the on-vehicle acoustic device
10. As shown in FIG. The control unit 11 controls each unit of the on-vehicle acoustic device 10.
The control unit 11 includes, for example, a central processing unit (CPU) as an arithmetic
processing unit, a read only memory (ROM), a processor including a random access memory
(RAM), and a memory such as an electrically erasable programmable ROM (EEPROM). .
[0020]
The sound source 12 functions as storage means for storing a predetermined audio signal, and
generates an audio signal. The sound source 12 includes, for example, a memory storing voice
data (for example, a warning sound, a message of an advertisement, etc.), a radio tuner, a
television tuner, a disc media player, a digital audio player, etc. When audio data is selected, it
generates an audio signal in digital form. This selection is performed by the operator operating
an operation element (not shown) connected to the control unit 11. The control unit 11
superimposes the information to be transmitted to the listener on the audio signal generated by
the sound source 12 and supplies the information to the speaker array device 14.
[0021]
The wireless communication unit 13 performs wireless communication with an external
communication terminal. The wireless communication unit 13 performs, for example, near field
wireless communication conforming to the Bluetooth (registered trademark) standard with the
wireless communication unit of another vehicle or the wireless communication unit built in a
portable terminal carried by the listener. Do. The camera 15 is attached to, for example, vehicle
exterior equipment such as the roof 104, the hood 101 or the trunk 103, and in-vehicle
equipment such as a dashboard, and supplies imaging data obtained by imaging the vehicle
exterior to the control unit 11. There are preferably a plurality of cameras 15, and they are
respectively arranged at positions such as the front, both sides, and the rear of the vehicle 100 so
as to be able to image around the vehicle without leakage.
[0022]
The speaker array device 14 includes an input receiving unit 141, a delay unit 142, D / A
converters 143A, 143B, ..., 143P, power amplifiers 144A, 144B, ..., 144P, and speakers 145A,
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145B, ..., 145P is provided. The input receiving unit 141 is an interface that receives an input of
the audio signal supplied from the control unit 11. The input receiving unit 141 receives, for
example, an input of an audio signal of one channel or multiple channels (for example, 5.1
channels).
[0023]
The delay unit 142 has a plurality of delay circuits, adds a delay to the input audio signal, and
outputs the signal to each speaker 145. As a result, the sound output from the entire speaker
array device 14 interferes with each other as the output sound from the speakers 145 and
becomes an audio beam having directivity. The delay unit 142 supplies an audio signal to each
speaker 145 for each channel so as to output an audio beam at the number, directivity, and beam
output angle of the audio beam according to the setting by the control unit 11 (ie, Control the
delay time). In the present embodiment, an audio signal is supplied to all of the speakers 145.
[0024]
The D / A converters 143A, 143B,..., 143P convert the audio signals supplied from the delay unit
142 from digital format to analog format. The power amplifiers 144A, 144B, ..., 144P amplify the
audio signals supplied from the D / A converters 143A, 143B, ..., 143 at a predetermined
amplification factor. The speakers 145A, 145B,..., 145P convert the audio signals supplied from
the power amplifiers 144A, 144B,. With this configuration, an audio signal is supplied to each of
the plurality of speakers 145 at a timing according to the position of the listener, and an audio
beam reaching the listener is output from the speaker array device 14.
[0025]
FIG. 6 is a diagram showing a functional configuration of the on-vehicle acoustic device 10. As
shown in FIG. The listener information acquisition unit 21 is a function realized by the wireless
communication unit 13. The listener information acquisition unit 21 acquires listener
information on a listener who is the output destination of the sound beam. Specifically, the
listener information acquisition unit 21 performs wireless communication with a wireless
communication unit of another vehicle or a wireless communication unit built in a portable
terminal carried by a listener, and performs an on-vehicle acoustic device or a portable device of
the vehicle. Acquire listener information stored in the terminal. The listener information is
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information for specifying information to be provided to the listener, such as the age, sex,
interest, category of the information desired by the listener, and attributes of the listener, for
example.
[0026]
The listener position detection unit 22 is a function realized by the camera 15 and the control
unit 11 and detects the relative positional relationship of the listener with respect to the speaker
array device 14. The relative positional relationship is information on how far from the speaker
array device 14 the listener is in what direction. If the installation position and direction of the
camera 15, the positional relationship between the camera 15 and the speaker array device 14,
the angle of view of the camera 15, etc. are known in advance, the control unit 11 is based on the
imaging data supplied from the camera 15. By calculation, the relative positional relationship of
the listener with respect to the speaker array device 14 can be detected. Note that the listener
position detection unit 22 is replaced with the imaging data supplied from the camera 15
described above, and position data by a GPS (Global Positioning System) (not shown) attached to
the vehicle and connected to the control unit 11 The relative positional relationship of the
listener with respect to the speaker array device 14 may be detected from position data based on
GPS provided in a portable terminal or the like carried by the user. In this case, it is conceivable
that the listener's position data is acquired by the listener information acquisition unit 21 from
the listener's portable terminal.
[0027]
The superposition information generation unit 23 generates superposition information to be
superimposed on the audio beam based on the listener information acquired by the listener
information acquisition unit 21. FIG. 7 is a diagram for explaining the correspondence between
listener information, the relative positional relationship between the vehicle and the listener, and
the superimposing information, and illustrates rules for generating superimposing information.
In the example of the figure, for example, when the pattern (combination) of various information
included in the listener information is information pattern 1 (for example, age 30s, female,
interest; movie, sports), the listener position is the vehicle 100 The superimposition information
generation unit 23 generates information of the file name “data a-1” as superposition
information (specifically, the control unit 11 generates the file name “data a-1” from the
memory). Read out the data file of, the same as below). When the position of the listener of the
same listener information is the side of the vehicle 100, the superposition information generation
unit 23 generates information of the file name “data a-2” as superposition information. When
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the position of the listener of the same listener information is behind the vehicle 100, the
superposition information generation unit 23 generates information of the file name “data a3” as superposition information. In the case of this example, when the same listener moves from
the front of the vehicle 100 to the side of the vehicle 100 to the rear, for example, listens to the
effect that the movie is advertised when the listener is in front (data a-1) To the listener, and
when the listener is on the side, give the listener a list of movies to be promoted (data a-2), and
when the listener is behind, listen to the list of movies to be promoted It is possible to provide
different information depending on the position of the listener, such as delivering to the listener
a movie advertisement (data a-3) that matches the person's interest.
[0028]
Further, in another example of FIG. 7, for example, in the case where the pattern (combination) of
various information included in the listener information is the information pattern 2 (for
example, age 50s, male, interest; reading, travel) When the person position is in the range of 20
m to 10 m ahead of the vehicle 100, the superposition information generation unit 23 generates
information of the file name “data b-1” as superposition information. Further, when the
position of the listener of the same listener information is within 10 m ahead of the vehicle, the
superposition information generation unit 23 generates information of the file name “data b2” as superposition information. In this example, when the same listener gradually approaches
the vehicle 100 from the front, for example, when the listener is in the range of 20 m to 10 m
ahead, a list of books to be advertised (data b-1) To the listener, and when the listener is within
10 meters ahead of the list of books to be advertised, inform the listener of a book advertisement
(data b-2) that suits the listener's interest, etc. It is possible to provide different information
depending on the position of the listener.
[0029]
The audio data generation unit 24 is a function realized by the control unit 11, and for an audio
signal supplied from the sound source 12, an audio signal based on the superimposition
information supplied from the superimposition information generation unit 23 is It functions as
an addition unit that performs superposition (addition) according to a predetermined modulation
scheme such as a scheme or an AM (Amplitude Modulation) modulation scheme. The audio beam
control unit 25 is a function realized by the control unit 11 and the array speaker apparatus 14
and controls the number of audio beams to be output to the listener, the directivity, and the
beam output angle. The sound emitting unit 26 is a function realized by the speaker 145, and
emits sound in accordance with the audio signal supplied from the audio beam control unit 25.
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At the listener side, this voice is received by the dedicated terminal, and the dedicated terminal
extracts and decodes the superimposed information, and outputs the voice or display.
[0030]
[Operation] Next, the operation of the on-vehicle acoustic device 10 will be described with
reference to FIG. First, the listener information acquisition unit 21 acquires listener information
on the listener who is the output destination of the audio beam (step S1). Next, the listener
position detection unit 22 detects the relative positional relationship of the listener with respect
to the speaker array device 14 (step S2). The processes of steps S1 and S2 are independently
performed at predetermined intervals. In steps S1 and S2, by associating the acquired listener
information with the position of the listener, it is possible to temporally track the position of the
listener who is the source of the listener information. The order of steps S1 and S2 may be
reversed.
[0031]
Next, the superimposition information generation unit 23 generates superimposition information
to be superimposed on the audio beam based on the listener information (step S3). Next, the
sound data generation unit 24 generates sound data by superimposing the superimposition
information on the sound signal supplied from the sound source 12 according to a
predetermined method (step S4). Next, the audio beam control unit 25 controls the number of
audio beams, the directivity, and the beam output angle so that the audio can reach the position
of the listener detected in step S2 with an appropriate sound pressure. The noise is emitted (step
S5). Then, when the relative position of the listener detected in step S2 regularly executed is out
of the provision range of sound (for example, 30 m or more from the speaker array device 14)
(step S6; YES), the process of FIG. finish. The number of audio beams changes in accordance with
the number of listeners.
[0032]
According to the embodiment described above, when information is transmitted from the vehicle
to the listener by sound, it is possible to distribute information according to the position of each
listener. Furthermore, delivery of information according to information on each listener can be
realized.
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[0033]
[Modification] The present invention can be implemented in a form different from the abovedescribed embodiment. The present invention can also be implemented, for example, in the
following modes. Moreover, the modifications shown below may combine each suitably.
(Modification 1) The position where the speaker array device 14 described in the above
embodiment is provided, and the direction of the speaker array device 14 are merely examples.
In order to output a voice beam to a listener having a different positional relationship with the
vehicle, the forward direction, the lateral direction, the backward direction or the direction
inclined in the forward direction when the moving direction of the moving object as the vehicle is
forward The speakers of the speaker array device 14 may be arrayed so as to face the FIG. 9 is a
view exemplifying the installation position of the speaker array device 14 according to this
modification. Although the position shown by the solid line g in the figure is the installation
position of the speaker array device 14 according to the embodiment, the speaker array device
may be installed at each position as shown by the dotted line. For example, the speaker array
device may be provided on a pillar (dotted line p) which is a window pillar supporting the roof
104 of the vehicle 100. In this case, as shown in FIG. 9, the speaker array device 140 is provided
such that a plurality of speakers are arranged along the longitudinal direction of the pillar. The
speaker array device 140 includes a plurality of speakers arranged to face either the front, the
side, or the rear when the traveling direction of the vehicle is the front. Among the plurality of
speakers included in the speaker array device 140, speaker groups directed to the front, side, or
rear are arranged at positions divided in the vertical direction. In the illustrated example, the
front facing speaker group 140a is disposed at the highest position, the side facing speaker
group 140b is disposed at the lower position, and the rear facing speaker group 140c is disposed
at the lowest position. . In this case, the listeners use the speaker group 140a facing forward for
tall listeners (adults) and the speaker group 140c facing backwards for short listeners (children).
The speaker group used may be used properly depending on the height of the speaker. Also, the
speaker groups 140a, 140b, and 140c may change the output direction of the sound beam in the
vertical direction according to the height of the listener. In this case, the listener position
detection unit 22 measures the height of the listener, transmits information indicating the height
of the listener to the voice beam control unit 25, and the sound beam control unit 25 determines
the height based on the height. Determine the vertical position where the voice beam should be
output.
The speaker array device may be attached to the pillar so that the speaker array device 140
hangs down from the roof 104, or the speaker array device 140 may be attached directly to the
outer surface of the pillar by a magnet, screwing, or the like.
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[0034]
(Modification 2) The method for transmitting information from a vehicle using sound is not
limited to the embodiment. For example, instead of superimposing information on voice, the
information itself may be output as an audible voice message. Further, the configuration and
operation as shown in FIGS. 10 and 11 may be adopted. The listener position detection unit 31 of
the in-vehicle acoustic device 30 is a function realized by the camera 15 and the control unit 11
of FIG. 5, and detects the relative positional relationship of the listener with respect to the
speaker array device 14 (FIG. 12 step) S11). The voice data generation unit 32 is a function
realized by the control unit 11 of FIG. 5, and for voice signals supplied from the sound source 12,
voice data to which ID information assigned to the on-vehicle acoustic device 30 is added.
Generate The voice beam control unit 33 is a function realized by the control unit 11 and the
array speaker device 14 of FIG. 5, and controls the number of voice beams to be output to the
listener, directivity, and beam output angle, The sound emitting unit 35 emits an audio beam
(step S12 in FIG. 12).
[0035]
The voice acquisition unit 41 of the portable terminal 40 carried by the listener is, for example, a
microphone, and picks up (acquires) the voice beam emitted in step S12 (step S13 in FIG. 12).
The combining unit 43 of the portable terminal 40 extracts ID information from the acquired
voice beam (step S14 in FIG. 12), combines the extracted ID information with the listener
information stored in the storage unit 42, and performs wireless communication. It transmits to
the server 50 from the part 44 (FIG. 12 step S15).
[0036]
The information acquisition unit 51 of the server 50 receives (acquires) the ID information and
the listener information transmitted in step S16. Then, the information processing unit 52 of the
server 50 generates information to be provided to the listener based on the ID information and
the listener information. Specifically, the contents of the information to be provided are
associated with each other and stored in the storage unit of the server 50 for each combination
of the ID information and the listener information, and the information processing unit 52 Read
from the storage unit. Then, the information transmission unit 53 of the server 50 transmits the
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generated information to the portable terminal 40 (step S16 in FIG. 12).
[0037]
The wireless communication unit 44 of the portable terminal 40 receives the information
transmitted from the server 50 (step S17 in FIG. 12), and displays (outputs) on the display unit
45 (step S18 in FIG. 12).
[0038]
(Modification 3) Further, in the above-described embodiment, the superimposition information is
superimposed on the signal supplied from the sound source 12 to generate the audio data.
However, the audio data may be generated using only the superimposition information.
According to this, since the sound is not output as the audible sound, the information can be
delivered only to the target listener without emitting the sound that can be heard around the
listener.
[0039]
(Modification 4) Furthermore, although the signal supplied from the sound source 12 in the
above-described embodiment is voice data selected by the operator, voice is generated based on
the information acquired by the listener information acquisition unit 21. It may be voice data
automatically selected by the data generation unit 24. According to this, it is possible to emit
sound data (such as music or sound information) tailored to the listener's interest to a specific
listener.
[0040]
(Modification 5) The vehicle-mounted acoustic device 10 may output an audio beam in
cooperation with a video display device (for example, a liquid crystal monitor) provided in the
vehicle 100. For example, a video display device is provided on a truck bed of a truck type
vehicle, and the control unit 11 of the on-vehicle acoustic device 10 outputs an audio beam
based on an audio signal of content for which video is displayed on the video display device. It is
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also good.
[0041]
(Modification 6) The voice beam control unit 25 causes the speaker array device 14 to output a
voice beam that reduces the Doppler effect due to the change in distance due to the time change
between the speaker array device 14 and the listener. It is also good. Specifically, in the process
of reducing the distance between the speaker array device 14 and the listener, the frequency of
the sound emitted from the speaker array device 14 and reaching the listener becomes high, and
in the process of increasing the distance, The frequency of the sound emitted from the speaker
array device 14 and reaching the listener becomes low. Therefore, when the frequency of the
voice changes, the frequency of the ID information also changes, and the terminal may
erroneously recognize the ID information. Therefore, the audio beam control unit 25 is
previously low (if the speaker array device 14 and the listener approach) or high (the speaker
array device 14 and so on) so as to offset the change in frequency due to the distance change.
When it gets away from the listener, it emits noise at a frequency. This allows the terminal side to
correctly recognize the ID information.
[0042]
(Modification 7) The on-vehicle acoustic device 10 does not output an audio beam using all of the
speakers included in the speaker array 145 of the speaker array device 14, but outputs an audio
beam using only some of the speakers. It is also good. Although a four-door sedan type vehicle is
illustrated in the embodiment as the moving body of the present invention, the vehicle shape and
the type of power source are not particularly limited. For example, the vehicle of the present
invention may be a roofless vehicle or a roofable vehicle. The mobile object of the present
invention includes a vehicle such as a train or a bus that travels for the purpose of transporting
an occupant, and a vehicle such as a play tool that is not intended to transport passengers.
[0043]
(Modification 8) The function realized by the control unit 11 of the on-vehicle acoustic device 10
of the above-described embodiment may be realized by a combination of a plurality of programs
or may be realized by a linkage of a plurality of hardware resources. When the function of the
control unit 11 is realized using a program, this program is a magnetic recording medium
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(magnetic tape, magnetic disk (HDD (Hard Disk Drive), FD (Flexible Disk), etc.)), optical recording
medium (optical disk) And the like, may be provided as stored in a computer-readable recording
medium such as a magneto-optical recording medium, a semiconductor memory, etc., or may be
distributed via a network.
[0044]
DESCRIPTION OF SYMBOLS 10 Vehicle-mounted acoustic device 11 Control part 12 Sound
source 13 Wireless communication part 14 (14a, 14b, 14c, 14d) Speaker array device 15
Camera 21 Listener information acquisition part 22 Listener position detection unit 23:
superposition information generation unit 24: voice data generation unit 25: speech beam
control unit 26: sound emission unit 100: vehicle 104: roof 145 (145A: 145P) Speaker
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