close

Вход

Забыли?

вход по аккаунту

?

JPH04137898

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 JPH04137898
[0001]
The present invention relates to an acoustic device for a vehicle, and in particular, mechanically
and arbitrarily adjusts presence, such as a sense of distance and a sense of spread, of a sound
field reproduced in a vehicle compartment using a reflector. The present invention relates to a
vehicle acoustic device capable of (Prior art) In general, in a sound device, a sound wave output
from a speaker and reaching a listener is a direct sound that travels along the shortest path and a
reflected sound that is delayed slightly along a path longer than the direct sound. There is an
indirect sound such as this, and this indirect sound becomes a reverberation sound, and
according to the delay time and the sound pressure, it gives a sense of realism such as the
distance between the sound fields or the spread feeling. However, in the vehicle acoustic
apparatus provided in a narrow vehicle interior, the relationship between the direct sound and
the indirect sound that reach the listener from a speaker provided by being fixed to a rear tray or
the like is unique and does not produce much time difference. Therefore, the reverberation
component is insufficient, and it is difficult to obtain a sense of presence such as the distance
between the sound fields and the spread feeling suitable for the music genre to be reproduced.
Therefore, conventionally, as a vehicle acoustic device capable of well reproducing a realistic
sound field such as a sense of distance and a sense of spread in a narrow vehicle interior, a main
reproduction amplifies a source signal by a main amplifier and reproduces it by a main speaker
In addition to the system, this is delayed by a delay circuit based on the source signal to create a
pseudo reverberation sound signal component, and this reverberation sound signal component is
amplified by a sub amplifier and reproduced by a sub speaker Various proposals have been made
(Japanese Patent Application Laid-Open No. 62-216493 etc.). That is, in this way, when the
source signal is delayed to create pseudo reverberation, the delay time and the output sound
pressure can be arbitrarily changed, thereby enabling the music genre such as Claristic, Jazz, or
Rock. In accordance with the tune of the music, and according to each sound field such as a hall,
10-05-2019
1
a stage or a studio recorded, it is possible to appropriately adjust the realism such as the sense of
distance and the sense of spread. (Problem to be Solved by the Invention) However, in the abovementioned conventional vehicle acoustic apparatus, in addition to the main reproduction system
for amplifying and reproducing the source signal as it is, a sub reproduction system, ie, a pseudo
reverberation signal component The delay circuit for creating the signal, the sub amplifier for
amplifying the pseudo reverberation signal component, the sub speaker for outputting the
pseudo reverberation sound, etc. are separately required, and the number of devices constituting
the device is increased. Not only can the installation space be increased, but also it is expensive.
The present invention has been made in view of such circumstances, and an object thereof is a
main reproduction system speaker for amplifying and outputting a source signal as it is without
requiring a slave reproduction system for producing a reverberation in a pseudo manner. An
inexpensive and compact system that can properly adjust the sense of distance such as the
distance and the feeling of expansion of the sound field reproduced in the vehicle compartment
by mechanically diffusing the sound waves from the vehicle into the vehicle compartment using
the reflection plate An object of the present invention is to provide a vehicle acoustic device.
(Means for Solving the Problems) In order to achieve the above object, the present invention
provides a speaker, a reflector provided in the vicinity of the speaker to reflect sound waves
outputted from the speaker, and a reflector And a tilt angle variable means for varying the tilt
angle to constitute a vehicle acoustic device. (Operation) According to the vehicle acoustic device
of the present invention having the above configuration, the setting inclination angle of the
reflecting plate for reflecting the sound wave output from the speaker is arbitrarily adjusted by
the inclination angle changing means. The sound path reflected by the reflection plate can be
changed variously to reach the listener, and the reverberation is mechanically controlled
according to the music genre to be reproduced, etc., so that the sound field has an excellent
sense of presence It can be reproduced. (Embodiment) Hereinafter, an embodiment of the vehicle
acoustic device according to the present invention will be described in detail with reference to
the attached drawings. FIG. 1 is a schematic block diagram showing a first embodiment of the
vehicle acoustic device according to the present invention, in which 2 is a speaker, and the
speaker 2 is embedded in the rear tray 4 of the vehicle and attached upward ing. Further, an
amplifier (not shown) for amplifying the source signal as it is and driving the same is connected
to the speaker 2. By the way, in the vicinity of the speaker 2, a flat plate-shaped first reflecting
plate 6 which is located on the front of the speaker 2 and mainly reflects the sound wave
outputted from this toward the inside of the vehicle compartment, The second reflecting plate 8
is also provided in the form of a flat plate to reflect the light mainly backward, and the angle of
inclination of each of the reflecting plates 6 and 8 can be arbitrarily adjusted by the angle of
inclination changing means 10 There is. That is, on both sides of the speaker 2, a support stay
12.1.2 is provided upright on the rear tray 4 and the first reflection plate 6 is fixed to the rear
end thereof and the rotary shaft 14 provided is provided. A hook is passed between the support
stays 1212 and pivotally supported so that the front end side can be vertically lifted and lowered.
10-05-2019
2
Further, the second reflecting plate 8 has the rotary shaft 16 fixed to the front end thereof
similarly passed between the support stays 12.1.2 and pivotally supported so that the rear end is
thereby fixed. It is possible to look sideways or up and down. A stepping motor 20.22 for driving
is connected to the shaft end of each rotary shaft 14.16 through a bevel gear 18.18, and each
reflection is caused by the operation of the stepping motor 20.22. The inclination angles of the
plates 6, 8 are made variable. Each stepping motor 20.22 is driven and controlled by the control
circuit 28 via the drive circuit 24.26, and the control circuit 28 responds to the mode signal from
the selection switch 30 connected thereto. The tilt angles of the reflectors 6.8 are individually
controlled via the respective drive circuits 24 and 26.
That is, the selection switch 30 is provided with a plurality of mode positions such as classical,
jazz, and rock according to music genres, for example, and the mode signal corresponding to the
mode position is output from the selection switch 30 to the control circuit 28. Then, the control
circuit 28 controls the rotation angle of each stepping motor 20.22 through the drive circuit
24.26 so that the inclination angle is set in advance corresponding to the selected mode signal.
The rotation angle is corrected and controlled by an actual rotation angle signal fed back from
the stepping motor 2022. Therefore, in the vehicle acoustic device configured as described
above, the inclination angles of the reflectors 6 and 8 are controlled according to the mode
selected by the selection switch 30, for example, as shown in FIG. That is, in mode 1, as shown in
FIG. 6A, in the first reflection plate 6, the sound wave output upward from the speaker 2 is
reflected forward toward the vicinity of the listener's leaning point and is shortest. It is set to the
angle transmitted by the path a. That is, the sound wave transmitted to the listener on the
shortest path a becomes the direct sound in this embodiment. On the other hand, the second
reflection plate 8 temporarily reflects the sound wave output upward from the speaker 2 toward
the rear window glass 32 at the rear, and after that, the sound wave reflected again by the rear
window glass 32 is leaned to the listener It is set to an angle that can be transmitted by the
shortest route forward toward the vicinity of the point. That is, the sound wave transmitted to the
listener along the shortest path occupies most of the indirect sound in this embodiment. And
when the inclination angle of the 1st reflective plate 6 and the 2nd reflective plate 8 is set like
this, that time difference is the sound wave of the sound wave of the path a which is direct sound,
and the sound wave of the indirect sound which is indirect sound. Since there is not much, and
the directions of arrival are almost the same, the reverberation is not added much and the sound
image is sharpened. In other words, it is suitable for the reproduction of the recording source of
music played with a few players, with a small scale of the performance space, and with the player
and the listener approaching each other. For example, music such as jazz and bobura , The sound
field can be reproduced with a sense of presence. In mode 2, as shown in FIG. 7B, the first
reflection plate 6 is a path C where the sound wave output upward from the speaker 2 is
reflected forward below the listener's sleeping point. It is set to the taking angle.
10-05-2019
3
On the other hand, the second reflection plate 8 reflects the sound wave outputted upward from
the speaker 2 toward the upper side portion of the rear rear window glass 32 and the sound
wave reflected again by the rear window glass 32 It is set to an angle which takes a path d which
is transmitted forward from above the stiffening point. That is, the two paths C and d are set to
diffuse. And when the inclination angle of the 1st inclination board 6 and the 2nd inclination
board 8 is set in this way, the sound wave of the path C and the sound wave of the path d
produce a certain time difference, and those paths Since c and d are diffused, the reverberation is
added to the sound and the sound is enhanced, and the sound image is spread. That is, it is
suitable for reproduction of a recording source of music played in a state where the player is
large and the performance space is large and the player and the listener are separated. Can be
reproduced realistically. FIG. 6C shows the case where the sound wave reflected by the second
reflection plate 8 is directed to the lower side of the rear window glass 32. In this case, the sound
wave reflected again by the rear window glass 32 is directed to the less reflective rear tray 4, but
if the third reflection plate 34 is further provided to the rear tray 4 so as to be ascendable, The
third reflection plate 34 can further reflect the sound wave forward in the vehicle compartment,
and in this case as well as the mode 2 described above, the path of the sound wave reflected by
the first reflection plate 6 It is possible to lengthen the path f of the sound wave reflected by the
second reflecting plate 8 with respect to e, and to increase the time difference to some extent.
FIG. 3 (A) shows the frequency characteristic of the conventional vehicle acoustic device
consisting only of the main reproduction system without the reflection plate, and FIG. 3 (B)
shows the actual implementation of this conventional vehicle acoustic device. The frequency
characteristic at the time of attaching the reflective plate 6.8 of an example is shown. In contrast
to the first vehicle acoustic device of this embodiment, the conventional vehicle acoustic device
has its frequency characteristics adjusted so that there is no particularly large mountain or valley
without a reflector as shown in FIG. If the second reflection plate 8 is attached and the inclination
angles thereof are set to each state of mode 1 and mode 2, the frequency characteristics thereof
are as shown by the solid line in FIG. It becomes as shown by the broken line, and it can be seen
that a great change is brought about in the frequency characteristics of both. FIG. 4 shows a
second embodiment of the present invention. As shown, in the second embodiment, the reflector
36 is assembled to a blind louver 38 which is a curtain provided on the rear glass window 32.
That is, the reflecting plate 36 is formed of a transparent acrylic material or the like, is attached
to the lower surface along the aluminum blind plates 40, and extends downward at the end on
the vehicle interior side. The reflecting portion 36 a is formed in an L shape. Further, shaft
portions 36 b integrally formed are provided on both side portions of each of the reflection
plates 36, and rotatably supported by the shaft portions 36 b and the support stay 42 of the
blind louver 38. The shaft portion 36b is connected to tilt angle changing means 44 for changing
the tilt angle of the reflection plate 36. The tilt angle changing means 44 is a worm wheel 46
fixed to the shaft end of the shaft portion 36b, and a worm 50 mounted on the rotation shaft 48a
of the stepping motor 48 for driving by meshing with this. The stepping motor 48 is controlled
10-05-2019
4
by the control circuit 54 via the drive circuit 52 in accordance with the mode selected by the
selection switch 56 and its rotation angle, as in the first embodiment. Is corrected by the actual
rotation angle signal input from the stepping motor 48 to the control circuit 54. In the second
embodiment configured as described above, the inclination angle of the reflecting plate 36 is
controlled according to the mode selected by the selection switch 56 as shown in FIG. 4, for
example. That is, as shown in FIG. 6A in mode 1, the inclination angle of the reflection portion
36a of the reflection plate 36 is a rear window in the rear of the vehicle compartment from the
speaker 2 embedded in the rear tray 4 and directed upward. The sound wave output toward the
glass 32 is set to an angle at which it is reflected forward toward the vicinity of the listener's
sonning point and transmitted along the shortest path g. In mode 2, as shown in FIG. 6B, the
inclination angle of the reflection portion 36a of the reflection plate 36 is a rear window behind
the vehicle interior from the speaker 2 embedded in the rear tray 4 and directed upward. The
sound wave output toward the glass 32 is set to an angle at which it is transmitted through a
path g for reflecting the sound wave forward and downward from the listener's sonning point.
Here, the sound wave output from the speaker 2 attached upward to the rear tray 4 has good
directivity among the frequencies and the mid-high range, which is related to the resolution of
the sound image, directly in the vehicle compartment. It is difficult to transmit to the listener in
front, and the light is reflected and reached by the roof part, the above-mentioned rear window
glass 32 part, the side window glass part and the like.
Therefore, for the listener, the sound wave reflected by the reflection plate 36 becomes a direct
sound that arrives first, and the other reflected sounds become indirect sounds that can be heard
as reverberation. Then, in the case where the reflection plate 36 is attached to each blind plate
40 of the blind louver 38 as in this embodiment, the sound waves not reflected by the reflection
portion 36 a of the reflection plate 36 are the blind plates 40 and the respective blind plates.
Diffusely reflected and diffused by the rear window glass 32, and the reverberant sound has
many components. Therefore, in this embodiment, the inclination angle of the reflecting plate 36
is set as in the above mode], and the direct sound reflected by the reflecting plate 36 is directed
to the listener's sonning point India by the path g. If it is transmitted, the resolution of the sound
image is enhanced, and it becomes suitable for the reproduction of the recording source of music
played with the player or a few players whose performance space is small and the player and the
listener are close to each other. For example, music such as jazz and popura can be reproduced
with a sense of presence in the sound field. On the other hand, the inclination angle of the
reflection plate 36 is set as in mode 2 above, and the direct sound reflected by the reflection
plate 36 is transmitted downward of the listener's body during the route. In this way, more
indirect sounds (reverberation sounds) will be transmitted to the listener, and the sense of
expanse of the sound image and the sense of distance increase, and the performance space of the
player or many people is large, and For example, it is possible to reproduce a recording source of
music played in a state of being separated from the player and the listener, for example, music
such as crutching can reproduce the sound field with a sense of presence. (Effect) As described
10-05-2019
5
above in detail in the embodiment, according to the vehicle acoustic device of the present
invention, the setting inclination angle of the reflection plate for reflecting the sound wave output
from the speaker is arbitrary by the inclination angle changing means. By adjusting to this, it is
possible to variously change the path of the sound waves reflected by this reflection plate to
reach the listener, and mechanically control the reverberation according to the music genre to be
reproduced, etc. You will be able to reproduce the sound field with a good feeling. Also,
compared to the conventional vehicle acoustic apparatus in which a reverberation sound signal is
artificially created from a source signal using a delay circuit and this reverberation sound is
output by a sub amplifier and a sub speaker, the number of component parts of that component
is As a result, the entire device can be compactly compacted, and the installation space can be
reduced or provided inexpensively.
[0002]
Brief description of the drawings
[0003]
1 to 3 show a first embodiment of a vehicle acoustic device according to the present invention,
and FIG. 1 is a perspective view schematically showing the main configuration of the device, and
FIG. 3 and FIG. 3 compare and show the frequency characteristics of the conventional device
without the reflector and the frequency characteristics of the first embodiment, and FIG. 3 (A) is a
graph showing the frequency characteristics of the conventional device. The same figure (B) is a
graph which shows the frequency characteristic of two modes in 1st Example.
Further, FIGS. 4 to 5 show a second embodiment, and FIG. 4 is a perspective view schematically
showing the configuration of the main part, and FIG. 5 is a view for explaining the operation. 2...
Speaker 4... Rear tray 6.8.36 ... .16 · · · · · · Rotating shaft 18 · · · · · Bevel gear 20.22. · · · Control
circuit 3056 · · · · · · · · selection switch 32 · · · · · · rear window glass 38 · · · · blind louver 40 · · ·
blind plate 46 · · · · · · · · · · · · · · · · · · · · · · · · · ... Worm
10-05-2019
6
Документ
Категория
Без категории
Просмотров
0
Размер файла
17 Кб
Теги
jph04137898
1/--страниц
Пожаловаться на содержимое документа