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JPH04259877

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH04259877
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
information transmission apparatus for transmitting information to be transmitted to a vehicle
occupant or the like by forming a sound field.
[0002]
2. Description of the Related Art As such a device, there is an alarm device as shown in, for
example, Japanese Utility Model Application Publication 63-16392. This is to detect the position
of an obstacle using a transmitter or receiver of electromagnetic waves or sound waves, control
the output levels of a plurality of speakers disposed in the car, and localize the sound image to
the detected direction position, so that the driver can It informs and warns of the presence of
obstacles.
[0003]
However, in such a conventional information transmission device, the output from the speaker is
an audible sound and, for example, even an alarm to be transmitted only to the driver may be
heard by other occupants. Therefore, for other crew members, the alarm sound may not only be
bothersome but also uncomfortable. In particular, when announcing the position of an obstacle
based on the position of the sound image, if the sound image is controlled for the driver, the
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other occupants may perceive the sound image at a different position, which may cause
discomfort or a sense of insecurity. There is also.
[0004]
SUMMARY OF THE INVENTION Accordingly, the present invention solves the above problem by
making the sound image recognizable only to a specific subject to whom information is to be
given and imperceptible to other persons in the vicinity. With the goal.
[0005]
Therefore, according to the present invention, an information generating means, an operation
control means for receiving a signal from the information generating means and emitting a
control signal of an output level corresponding to the information, a control signal And at least
two speakers connected to the driving means to individually output ultrasonic waves of the two
frequencies, each of which is directed By arranging the axes to intersect at the head position of a
specific subject and setting the beat frequency of the two frequencies to be in the audible range,
information can be transmitted only to the specific subject I made it.
Furthermore, by setting the above-described configuration corresponding to each of the specific
transmission target person's ears, it is possible to limit to a specific target user while transmitting
more information.
[0006]
Embodiments of the present invention will be described with reference to the drawings. FIG. 1
shows an example in which the present invention is applied to an obstacle warning of a vehicle,
and a radar 111 installed at an appropriate position of the vehicle for detecting an object around
the vehicle and a judging circuit 112 constitute an information generating means 101. The
determination circuit 112 determines from the position (azimuth, distance) of the object detected
by the radar 111 whether or not the object corresponds to an obstacle, and outputs the position
information when it corresponds.
[0007]
The radar 111 detects an object's distance and direction by transmitting and receiving an
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electromagnetic wave including a sound wave or a laser beam and measuring the time required
for the reciprocation, or processes an image captured by a camera. Depending on the range to
monitor from what detects the position of an object, etc. by this.
[0008]
The arithmetic control means 102 which receives a signal from the information generating
means 101 generates a control signal of an output level corresponding to the position
information of the obstacle.
The driving means 103 drives the speakers SP1 and SP2 at mutually different ultrasonic
frequencies f1 and f2 at this output level.
[0009]
As shown in FIG. 2, the speakers SP1 and SP2 are installed toward the head position of the driver
D at the lower part of the front pillars P1 and P2 on the left and right of the vehicle body and at
the mounting portion of the door mirrors M1 and M2.
[0010]
The process flow in the above circuit is shown in FIG.
When the radar 111 detects an object and outputs its position signal in step 11, the
determination circuit 112 receives it and determines in step 12 whether it is an obstacle or not,
and if it corresponds to an obstacle, information generating means An obstacle position
information signal is output as an output of 101. Next, at step 13, the arithmetic control means
102 determines an output level V which is inversely proportional to the distance R to the
obstacle.
[0011]
At step 14, the driving means 103 outputs signals of two different ultrasonic frequencies f1 and
f2 at the output level V determined at step 13, and the ultrasonic signal of frequency f1 is sent to
the speaker SP1. The ultrasonic signal of f2 is supplied to the speaker SP2.
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[0012]
The ultrasonic wave of frequency f1 output from the left speaker SP1 and the ultrasonic wave of
frequency f2 output from the right speaker SP2 travel toward the head of the driver D and
intersect there. Because they interfere with each other, they generate beats.
The frequency of the beat is given by f = f1-f2, and the frequencies f1 and f2 are set so that the
frequency of the beat is in the audible range, for example 1 kHz.
[0013]
As a result, the driver D perceives a humming noise at his ear, and the closer the obstacle is, the
louder the sound pressure level becomes, and the farther it gets, the smaller the sound is heard.
[0014]
On the other hand, since the ultrasonic waves have a good directivity and a small spread, they do
not overlap in areas other than the vicinity of the head position of the driver D.
For this reason, even in the vicinity of the ears of the occupants other than the driver, even if the
ultrasonic waves arrive, only one of the ultrasonic waves does not generate beats, and only one
of the ultrasonic waves is not perceived by the occupants' ears. If necessary, as shown in FIG. 4,
the directional characteristics can be further sharpened by providing a tubular guide GD in front
of the speakers SP1 and SP2. Therefore, only the driver D can hear the alarm sound as
information to be transmitted, and the other occupants can not hear the alarm sound.
[0015]
Although the case of the obstacle warning has been described above as an example, the object of
the information is not limited to this, and traffic information and warning information at the time
of over speed may be used, and it is not particularly limited. Further, the occupants to whom the
information is transmitted are not limited to the driver, and may be selected according to the
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purpose of the content.
[0016]
FIG. 5 shows another embodiment in which controlled ultrasonic waves are directed to the left
and right ears of a specific occupant.
[0017]
As in the first embodiment, the information generation means 201 comprises a radar for
detecting an object around the vehicle and a determination circuit and generates an obstacle
position information signal.
[0018]
The arithmetic control means 202 receiving the signal from the information generation means
201 emits two control signals WL and WR of output level corresponding to the position
information of the obstacle.
The driving means 203 drives the first speaker sets SPL1 and SPL2 at mutually different
ultrasonic frequencies at the output level of the control signal WL, and the driving means 204
drives the second speaker sets SPR1 and SPR2 at the output level of the control signal WR. Drive
at different ultrasound frequencies.
[0019]
As shown in FIG. 6, the speakers SPL1 and SPR1 are installed at the lower portions of the front
pillars P1 and P2 on the left and right of the vehicle body and at the mounting portions of the
door mirrors M1 and M2. SPR2 is installed at the upper part of the right front pillar P2.
The first speaker set SPL1 and SPL2 are directed to the left ear position of the driver D, and the
second speaker set SPR1 and SPR2 are directed to the right ear position.
[0020]
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In this embodiment, as shown in the processing flow of FIG. 7, the position signal of the object
detected by the radar in step 21 is output in the information generating means 201, and the
decision circuit determines whether it is an obstacle or not in step 22. It is the same as that of the
previous embodiment to determine the position and to emit the position information signal when
it corresponds to the obstacle. The arithmetic control means 202 receives the obstacle position
information signal, and calculates the level V of the entire speaker output according to the
distance of the obstacle in step 23.
[0021]
The arithmetic control means 202 then determines the output levels WL and WR of each speaker
set in accordance with the direction of the obstacle in step 24.
[0022]
The above output level V is calculated to be in inverse proportion to the distance to the obstacle,
and the output levels WL and WR are such that if the azimuth of the obstacle is in the left
direction, WL is larger than WR according to the angle In the rightward direction, WR is
determined to be larger than WL.
[0023]
In step 25, the driving means 203 outputs signals of two different ultrasonic frequencies fL1 and
fL2 at the output level WL determined in step 24, and the ultrasonic signal of frequency fL1 is
sent to the speaker SPL1 The ultrasonic signal of fL2 is supplied to the speaker SPL2.
The driving means 204 outputs signals of two mutually different ultrasonic frequencies fR1 and
fR2 at the output level WR, and the ultrasonic signal of frequency fR1 is supplied to the speaker
SPR1, and the ultrasonic signal of frequency fR2 is supplied to the speaker SPR2.
[0024]
The ultrasonic wave of frequency fL1 output from the left speaker SPL1 and the ultrasonic wave
of frequency fL2 output from the speaker SPL2 travel toward the left ear of the driver D, cross
there and interfere with each other It produces a beating.
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[0025]
The ultrasonic wave of frequency fR1 output from the right speaker SPR1 and the ultrasonic
wave of frequency fR2 output from the speaker SPR2 respectively travel toward the right ear of
the driver D, cross there and beat the beat It occurs.
[0026]
The ultrasonic frequencies are set so that the beat frequencies fL = fL1-fL2 and fR = fR1-fR2 in
the vicinity of both ears become the same, for example, 1 kHz.
It is further simplified if fL1 = fR1 and fL2 = fR2.
[0027]
As a result, the volume of the beating increases as the obstacle gets closer to the driver, and the
sound pressure level to the left and right ears is controlled, so that the alarm sound can be heard
from the direction of the obstacle Sound image can be localized, and the direction and distance of
the obstacle can be recognized instantly.
[0028]
Furthermore, this beating only occurs near the driver's ear, and can not be heard by other
occupants.
[0029]
In this embodiment, the left and right sound pressure levels are changed in order to control the
position of the sound image. In addition to this, the left and right phases may be shifted, or both
may be controlled in combination.
[0030]
Furthermore, it is needless to say that the present invention can be used not only for information
transmission in a vehicle but also for information transmission in a large conference room of
many people.
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[0031]
As described above, the present invention receives a signal from the information generating
means, and outputs two different ultrasonic waves that produce audible beeps when interfered,
and identifies the ultrasonic waves. The information is transmitted to the specific subject only by
the sound image because the head position of the subject is crossed.
[0032]
Therefore, for example, even when giving a warning to the driver regarding an unexpected
obstacle while driving, it is possible to reliably draw attention to the sound image while
contributing to safety while reducing the driver's visual burden, and the information is necessary.
It is given only to the driver, and the other occupants do not hear the alarm sound, so they do not
feel bothersome and do not feel anxious about mischief.
It is very useful especially when there are a large number of passengers other than the driver
such as a large bus.
[0033]
Also, since the ultrasonic waves themselves are not perceived by the occupants' ears, there is no
restriction that the loudspeakers should not be placed near other occupants not to whom
information is to be transmitted, and the ultrasonic loudspeakers can be made relatively compact.
Therefore, when used for information transmission in a narrow vehicle, the degree of freedom of
the speaker arrangement is also large.
There is also the advantage that the necessary information can be transmitted only to certain
occupants, without the use of acoustic devices, such as earphones and headphones, which
restrict the movement of the occupants.
[0034]
Furthermore, when the left and right output levels are controlled using two sets of ultrasonic
waves crossing at each of the left and right ear positions of a specific occupant, it is applied to an
obstacle warning and information on the direction of addition to the distance of the obstacle is
also applied. It can be transmitted and has a great effect on the running safety of the vehicle.
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[0035]
Brief description of the drawings
[0036]
1 is a block diagram showing a circuit connection of the embodiment of the present invention.
[0037]
2 is a diagram showing an arrangement example of the speaker in the present invention.
[0038]
3 is a process flow diagram according to an embodiment of the present invention.
[0039]
4 is a diagram showing an example of the structure of the speaker.
[0040]
5 is a block diagram showing a circuit connection of another embodiment of the present
invention.
[0041]
6 is a layout diagram of the speaker in another embodiment.
[0042]
7 is a processing flow diagram in another embodiment.
[0043]
Explanation of sign
[0044]
101, 201 Information generation means 111 Radar 112 Determination circuit 102, 202
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Calculation control means 103, 203, 204 Driving means SP1, SP2 Speakers SPL1, SPL2, SPR1,
SPR2 Speaker D Driver
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