close

Вход

Забыли?

вход по аккаунту

?

JPH10290499

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH10290499
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
on-vehicle alarm sound source which performs active directivity control.
[0002]
2. Description of the Related Art Conventionally, in-vehicle alarm sound sources mounted on, for
example, police cars and ambulances, use a horn speaker system to efficiently emit alarm sounds
to the surroundings. Hereinafter, a conventional on-vehicle alarm sound source will be described
with reference to FIG.
[0003]
In FIG. 6, 21 is a horn driver, 22 is a folded horn for controlling the main axis of acoustic
radiation and directivity angle, 23 is a horn acoustic radiation surface, i is the aperture of horn
acoustic radiation surface 23, j is a horn length, k1 and k2 are horns It is a central axis.
Generally, the narrower the directivity angle, the longer the aperture i of the horn acoustic
radiation surface and the longer the horn central axes k1 and k2. Therefore, the horn driver 21
and the horn acoustic radiation surface 23 are coupled using the folded horn 22 obtained by
bending the horn. By doing this, the horn length j is reduced without shortening the lengths of
the horn central axes k1 and k2.
02-05-2019
1
[0004]
In the vehicle-mounted alarm sound source having such a configuration, the sound wave
reproduced by the horn driver 21 is guided in the direction of the arrow along the horn central
axes k1 and k2 inside the folded horn 22 to control directivity and horn acoustic radiation It
radiates from the surface 23 to the outside.
[0005]
However, in the above-described conventional alarm sound source for vehicle use, it is necessary
to enlarge the horn acoustic emission surface in order to achieve narrow directivity.
However, when installing the alarm sound source outside the vehicle body, it was difficult to
enlarge the horn acoustic emission surface because it was installed outside the vehicle body
which is a moving body, so an alarm sound source with a small diameter horn speaker system is
used The As a result, the directional characteristics become wide-angle, and the radiation sound
is transmitted to the driver as well as the passenger, which hinders the conversation and the
wireless communication.
[0006]
The present invention solves the above-mentioned problems, and provides an on-vehicle alarm
sound source that can realize narrow directivity characteristics without increasing the shape and
can reduce the emission noise transmitted to the driver and other passengers. Purpose.
[0007]
In order to achieve the above object, the on-vehicle alarm sound source of the present invention
comprises an alarm sound generator for generating an alarm signal, and a signal processing
means for inputting an output of the alarm sound generator. A first speaker installed outside the
passenger compartment and in the vicinity of the passenger and inputting the output of the
alarm sound generator; and having the same shape and acoustic characteristics as the first
speaker and the first speaker A second speaker installed so that an acoustic radiation surface is
in the opposite direction and receiving an output of the signal processing means, and directional
characteristic selection means for controlling signal processing performed by the signal
processing means The signal processing means may perform signal processing in which
electrical signals output to the first speaker and the second speaker have substantially the same
02-05-2019
2
amplitude and opposite phase characteristics based on an output signal of the directional
characteristic selection means. , Said Selectively perform signal processing in which the electrical
signal output to each of the first and second speakers has substantially the same amplitude and
the same phase characteristic as each other, and outputs it as an alarm sound signal to the
second speaker Thus, the dipole characteristics are such that the main axes of the acoustic
radiation of the alarm sound emitted from the first speaker and the second speaker are directed
forward and backward of the vehicle and the direction of least acoustic radiation is directed to
the passenger It is characterized in that the non-directional characteristic that makes acoustic
radiation uniform in all directions can be arbitrarily selected by the directional characteristic
selecting means.
[0008]
With this configuration, even in the case of a small-aperture speaker, dipole characteristics are
narrow directivity characteristics that can reduce alarm sound transmission in the direction of
the passenger without reducing the alarm volume in front of the vehicle, and alarm in the
forward direction equally. It is possible to arbitrarily switch between a single directivity
characteristic that emits sound.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present
invention will be described in detail with reference to the drawings.
[0010]
(First Embodiment) FIGS. 1, 2 and 3 are views showing a first embodiment of the present
invention, and FIGS. 1 and 2 are side views showing an example in which the present invention is
applied to a so-called 1BOX type automobile. FIG. 2 is a top view thereof, and FIG. 3 is a block
diagram showing the flow of the electrical signal.
1, 2 and 3, 1 is a vehicle body, 2 is a passenger, 3 is an alarm sound generator, 4 is a signal
processing means, 5 is a first speaker, 6 is a second speaker, and 7 is a directivity characteristic.
Selection means 8 is an alarm sound source, a1 and a2 are dipole characteristics, b1 and b2 are
principal axes of acoustic radiation of dipole characteristics a1 and a2, respectively, and c is nondirectional characteristics.
02-05-2019
3
[0011]
The first speaker 5 is disposed outside the vehicle body 1 and in the vicinity of the passenger,
and the second speaker 6 having substantially the same shape and acoustic characteristics as the
first speaker 5 has an acoustic radiation surface of the first speaker 5. It is disposed in the
opposite direction to the acoustic radiation surface.
[0012]
The alarm signal output from the alarm sound generator 3 is input to the signal processing
means 4 and the first speaker 5.
The signal processing means 4 adjusts the amplitude and phase of the alarm signal and outputs
the result to the second speaker 6.
At this time, the signal processing means 4 performs an alarm sound by performing signal
processing to make the alarm signal input to the second speaker 6 have substantially the same
amplitude and the opposite phase as the alarm signal input to the first speaker 5. As shown in
FIGS. 1 and 2, the dipole characteristics a1 and a2 are such that the principal axis direction b1 of
the acoustic radiation is directed to the front of the vehicle body 1 and the direction with the
least acoustic radiation is directed to the passenger.
In addition, the signal processing means 4 performs signal processing to make the alarm signal
input to the second speaker 6 have substantially the same amplitude and the same phase as the
alarm signal input to the first speaker 5, thereby generating an alarm sound. As shown in FIG. 1
and FIG. 2, the acoustic radiation has non-directional characteristics c in which acoustic radiation
is uniformly radiated in all directions centering on the center of gravity when the first speaker 5
and the second speaker 6 are paired. .
That is, by the signal processing method of the signal processing means 4, it is possible to
selectively form either the dipole characteristic or the non-directional characteristic of the
directional characteristic of the alarm sound.
[0013]
02-05-2019
4
The selection of the signal processing method in the signal processing means 4 as described
above is realized by the directional characteristic selection means 7 selecting whether it is a
dipole characteristic or an omnidirectional characteristic. Select signal processing to make alarm
sound non-directional characteristic when there is a need to emit alarm sound in a wide range,
such as when a car enters an intersection, signal processing to make dipole characteristic usually,
directional characteristic selection It selects by means 7.
[0014]
By this, alarm sound emission by non-directional characteristic c is taken only when alarm sound
needs to be emitted over a wide area, and sufficient sound volume in principal axis directions b1
and b2 of acoustic radiation is usually generated by alarm sound emission by dipole
characteristics a1 and a2. While ensuring, in the vicinity of the passenger 2, a good sound
environment in which the volume is reduced can be obtained.
[0015]
In the first embodiment, an example in which the present invention is applied to a 1BOX type car
is shown, but the same may be applied to other types of cars such as a sedan type, a truck type,
and a wagon type, and ships. Effect is obtained.
Further, although the present embodiment shows an example in which the passenger is on the
front of the vehicle, the same effect can be obtained even if the passenger is on the rear of the
middle of the vehicle.
[0016]
(Embodiment 2) FIG. 4 is a cross-sectional view of a sound source section of an alarm sound
source showing a second embodiment of the present invention. The present embodiment is an
embodiment similar to the first embodiment already described with reference to FIGS. 1 to 3, and
the only difference from the first embodiment is the configuration of the alarm sound source.
Therefore, in the present embodiment, only the configuration of the alarm sound source will be
described, and the description of the other components will be omitted.
02-05-2019
5
[0017]
In FIG. 4, 9 is a first horn driver, and 10 is a second horn driver. Reference numeral 11 denotes a
first acoustic pipe provided to the first horn driver 9 for guiding the alarm sound emitted from
the driver 9 to the outside. Reference numeral 12 is provided for the second horn driver 10 and
the alarm sound emitted from the driver 10 Is a second acoustic tube that leads the outside. As
shown in the figure, the first and second acoustic tubes 11 and 12 have a shape in which the
cross-sectional area perpendicular to the traveling direction of the sound wave (the direction of
the arrow in FIG. 4) changes continuously. Therefore, the first and second acoustic tubes 11 and
12 have a small change in frequency of acoustic impedance, and the acoustic radiation from each
of the first and second acoustic tubes 11 and 12 has less disturbance of the sound pressure
frequency characteristics. The alarm sound emitted can obtain good directional characteristics
and acoustic characteristics.
[0018]
(Embodiment 3) FIG. 5 is a cross-sectional view of a sound source section of an alarm sound
source showing a third embodiment of the present invention. The present embodiment is also the
same as the first embodiment already described with reference to FIGS. 1 to 3, and the only
difference from the first embodiment is the configuration of the alarm sound source. Therefore,
in the present embodiment, only the configuration of the alarm sound source will be described,
and the description of the other components will be omitted.
[0019]
In FIG. 5, 9 is a first horn driver, and 10 is a second horn driver. 13 is a first folding horn that
conducts one turn and guides the alarm sound emitted from the driver 9, and 14 is a second
folding horn that performs one turn and guides the alarm sound emitted from the driver 10 is
there. d1 and d2 are the horn central axes of the first and second return horns 13 and 14, and e1
and e2 are the horn lengths of the first and second return horns 13 and 14, respectively.
[0020]
The alarm sounds reproduced by the horn drivers 9 and 10 are guided in the directions of the
02-05-2019
6
arrows along the horn center axes d1 and d2 inside the first and second folded horns 13 and 14,
respectively, to control directivity characteristics. It is emitted to the outside. According to this
configuration, the cross-sectional area perpendicular to the traveling direction of the sound
waves (the direction of the arrow in FIG. 5) of the first folded horn 13 and the second folded horn
14 is smooth without increasing the horn lengths e1 and e2. Can be changed to Therefore, the
first folded horn 13 and the second folded horn 14 have a small change in frequency of the
acoustic impedance, and the acoustic radiation from the first folded horn 13 and the second
folded horn 14 has disturbance of the sound pressure frequency characteristic. Since it is small,
it is possible to obtain good directional characteristics and acoustic characteristics even though it
is a small (small) alarm sound source.
[0021]
In the third embodiment, although the case where the number of times of folding is once is
shown as an example, the embodiment is performed in a case where the number of times of
folding of the horn is further increased twice, three times,. Needless to say, the same effect can
be obtained.
[0022]
As is apparent from the above description, according to the on-vehicle alarm sound source of the
present invention, a sufficient sound volume of the alarm sound is secured in the main axis
direction of the sound radiation of the sound source, and at the same time the sound source is at
the passenger's position. The amount of transmission of direct sound from is reduced, making it
possible to obtain a good sound environment.
[0023]
In addition, since it is possible to selectively emit acoustic radiation uniformly in all directions
centering on the sound source as necessary, it is possible to minimize the influence of the alarm
sound on the surrounding environment as noise.
[0024]
In addition, the first and second speakers are connected to the acoustic emission surface of each
of the first and second horn drivers, and the first and second sounds whose cross-sectional areas
perpendicular to the traveling direction of the sound waves continuously change. By forming the
tubes, the first and second acoustic tubes have small changes in frequency of acoustic
impedance, and the acoustic radiation from each has less disturbance of the sound pressure
frequency characteristics, so that the alarm sound emitted from the outside is emitted. Can obtain
better directional characteristics and acoustic characteristics.
02-05-2019
7
[0025]
Furthermore, by configuring the first and second sound tubes to be folded at least once, a small
alarm sound source can be realized without increasing the horn length.
[0026]
Brief description of the drawings
[0027]
1 is a side view of the case where the in-vehicle alarm sound source according to the first
embodiment of the present invention is applied to a 1BOX type automobile.
[0028]
2 is a top view of the case where the in-vehicle alarm sound source according to Embodiment 1
of the present invention is applied to a 1BOX type automobile.
[0029]
3 is a principal block diagram according to Embodiment 1 of the present invention.
[0030]
<Figure 4> It is the figure which shows the sound source section of in-vehicle alarm sound source
in the form 2 of execution of this invention.
[0031]
<Figure 5> It is the figure which shows the sound source section of in-vehicle alarm sound source
in the form 3 of execution of this invention.
[0032]
6 is a diagram showing a sound source portion of the conventional alarm sound source for
vehicle.
[0033]
02-05-2019
8
Explanation of sign
[0034]
Reference Signs List 1 vehicle body 2 passenger 3 alarm sound generator 4 signal processing
means 5 first speaker 6 second speaker 7 directivity characteristic selection means 8 alarm
sound source 9 first horn driver 10 second horn driver 11 first acoustic tube 12 second acoustic
tube 13 first folded horn 14 second folded horn 21 horn driver 22 folded horn 23 acoustic
radiation surface a1, a2 dipole characteristic b1, b2 dipole characteristic a1, a2 principal axis of
acoustic radiation c nondirectional characteristic d1, d2, k1, k2 Central axis of the folded horn
e1, e2, j Horn length i Aperture diameter of sound emission surface
02-05-2019
9
Документ
Категория
Без категории
Просмотров
0
Размер файла
17 Кб
Теги
jph10290499
1/--страниц
Пожаловаться на содержимое документа