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DESCRIPTION JPH0424136

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DESCRIPTION JPH0424136
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vehicle acoustic apparatus having a function of adjusting frequency transmission characteristics.
(Prior Art) A sound field space in a vehicle compartment in which a vehicle acoustic device is
used has considerably unique acoustic conditions as compared to a sound field space (listening
room) in a home or the like. For example, it is one of them that the room volume is as narrow as
about 3 m 3 on average. Therefore, the interference between the direct sound from the speaker
and the reflected sound from the partition surface in the vicinity of a window crow or the like
occurs particularly in the middle of the transmission frequency characteristic, and a large "wave"
occurs in this band. As a result, as shown in FIG. 4, a large undulation occurs in the frequency
transmission characteristic, and the clarity of the voice is insufficient, and there is a problem that
the reproduced sound tends to be strong in a sense of stagnation. In order to solve this problem,
it is necessary to correct and flatten the transmission characteristics of the above frequency at a
specific listening position or listening point). Conventionally, a graphic equalizer is generally used
as a method of electrically performing the flattening of the frequency transmission characteristic.
The graphic equalizer normally divides the reproduction band of the acoustic signal into seven to
nine bands and adjusts the level of each band to flatten the transmission characteristics of the
frequency. However, this method has the disadvantage that it is not always effective because the
required correction characteristics differ depending on the type of vehicle and that correction
can be made only for each listening point. Therefore, recently, a time axis correction system is
adopted to create a reflection correction signal simulating the arrival time difference and level
difference of the reflected sound to the direct sound at the listening point, and the correction
signal is subtracted from the original signal to drive the speaker. It is also under consideration
("Pioneer Technolon-Reader J. ohm, published on April 25, 1987, pages 118 to 121). When such
a configuration is adopted, the influence of the reflected sound is reduced at the listening point
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which is at least regardless of the type of vehicle, and it is easy to realize the flattening of the
frequency transmission characteristic. However, the actual reflected sound at the listening point
is diverse, and it is not always easy to form a reflection correction signal that simulates all of
them, and the circuit configuration is quite complicated. There is a problem that it is necessary
and the cost is also considerably high. Also, since the reflection correction signal is originally at a
specific listening point that does not work effectively for other listening point positions, all
persons of a plurality of occupants listen to a good reproduced sound There is no reason to do it.
(Means for Solving the Problems) The inventions described in claims 1 and 2 of the present
invention are both made for the purpose of solving the above-mentioned problems, and the
following means for solving the problems are provided. It is configured to be equipped.
According to the first aspect of the present invention, there is provided a vehicle acoustic
apparatus comprising: an acoustic signal source; and a speaker for reproducing an acoustic
signal output from the acoustic signal source. Audio apparatus, a phase conversion means for
changing the position of an acoustic signal output from the acoustic signal source, and a window
glass of the vehicle according to the acoustic signal output phase-converted by the phase
conversion means. And vibration generating means for vibrating the window glass. (2) The
vehicle acoustic device of the invention according to claim 2 according to claim 2 of the
invention illill 2 further comprises a window glass in the configuration of the vehicle acoustic
device according to the invention according to claim 1 so as to be able to be opened and closed.
By providing the vibration generating means in the lower part, the vibration generating means is
not positioned in the window opening area even in the fully closed state of the window glass.
(Operation) (1) Operation of the Invention of Claim 1 In the constitution of the invention of Claim
1 as described above, the vibration generating means is provided on the window glass itself of
the vehicle which is the reflection surface of the sound from the speaker. The vibration
generating means is driven by the phase-shifted acoustic signal output by the phase conversion
means, thereby vibrating the window glass. Therefore, for example, when the phase conversion
means converts the phase of the sound signal output from the sound signal source into the
opposite phase, the window glass comes out of the speaker and is transmitted to the window
glass surface of the window glass. It is canceled by the direct sound or the anti-phase vibration of
the window glass so that it is not reflected. As a result, no interference occurs at the listening
point between the reflected sound from the window glass and the direct sound as in the prior art.
(2) Operation of the invention according to claim 2 In the configuration according to claim 2 of
the invention, the vibration generating means is provided at the lower part of the openable and
closable window glass, and the window opening area is also in the fully closed state of the
window glass. Since the vibration generating means is not located inside, even if the window
glass is fully closed, the same view is not blocked and the appearance is not deteriorated. (Effects
of the Invention) As a result of the above, according to the invention of claim 1 of the present
application, the amount of generation of the reflected sound can be greatly reduced with a
relatively simple configuration in which only the vibration generating means is attached to the
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window glass. This will make it possible to flatten the frequency transmission characteristics and
reduce the cost.
Next, according to the invention of claim 2 of the present application, in addition to the effect of
improvement of the frequency transmission characteristic similar to the invention of claim 1 can
be obtained, the presence of the vibration transmission means is the opening and closing state of
the window glass. Regardless of the condition, the product is always kept in a completely stored
state, so that the visibility of the window glass, the appearance on the appearance, etc. are not
adversely affected. 1 to 3 show a vehicle acoustic device according to an embodiment of the
present invention. FIG. 1 shows an outline of the entire circuit configuration of the vehicle
acoustic system. In FIG. 1, reference numeral 1 denotes an acoustic signal source such as an onvehicle tuner, a casenodeno cow or the like. The acoustic signal output of each channel from the
acoustic signal source 1 and R (right) is respectively input to the speaker driving power amplifier
2 and amplified, and then provided, for example, on the left and right of the vehicle dash board
portion. Left) and R (right) are supplied to the speakers 3L and 3R of each channel and
reproduced as direct sound. On the other hand, reference numeral 4 denotes a phase conversion
circuit, which is supplied from the acoustic signal source 1 and inverts the phase of the acoustic
signal output of each R channel to, for example, an antiphase state and outputs it. After
amplification through the power amplifier 5, it is applied to a pair of left and right (and front and
rear) electric / vibration converters (corresponding to vibration generating means in the claims)
6A and 6B described next. For example, as shown in FIG. 2, the electric / vibration converters 6A
and 6B are fixed to the front lower end portions of the window glasses 9A and 9B of the doors
8A and 8B on the left and right sides of the vehicle 7, respectively. The doors 8A and 8B are
composed of the door pods 1OA and IOB as shown and the window glasses 9A and 9B fitted and
supported so as to be vertically movable up and down so as to be able to be stored in the door
bodies 10A and IOB. There is. The lower ends of the window glasses 9A and 9B are supported at
their centers by elevating sliders 12A and 12B, and the elevating sliders 12A and 12B are
vertically moved by power window regulators 13A and 13B to move the window glass 9A 9B up
and down. To automatically open and close the windows 14A and 14B. In this case, the electric /
vibration converter 6A6B is housed in the door cover 10A, IOB in the fully closed state of the
window portions 14A, 14B, that is, in the highest state of the window glasses 9A, 9B. The
mounting position is set to the proper position. Then, the window glass 9A, 9B is vibrated in
accordance with the reverse phase acoustic signal output supplied via the power amplifier 5 for
driving the electric / vibration converter as described above, whereby the interior of the vehicle
compartment is made from the speaker 3L3R. It cancels the direct sound transmitted through the
space, and controls so that the reflection of the direct sound does not occur from the surface of
the window glass 9A, 9B.
As a result, almost no direct sound reflection itself occurs from the left and right window glasses
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9A and 9B having a large occupied area as a reflection partition surface forming the vehicle
interior sound field space. Therefore, the absolute amount of the reflected sound transmitted at
any listening point regardless of the listening point such as the driver's seat or the front
passenger seat is greatly reduced. For this reason, according to this embodiment, the occurrence
of 'waviness' as shown in FIG. 4 due to the interference between the reflected sound and the
direct sound is prevented, and the frequency transmission characteristic is made flat as shown in
FIG. It becomes possible. As a result, the clarity of the sound to be listened to is improved, and it
is possible to realize the reproduction of the sound with good sound quality without a feeling of
stagnation. Furthermore, as described above, since the effect can be obtained simultaneously at
all listening points, there is no disadvantage that correction can be performed only for each
listening point as in the conventional graphic equalizer. Further, the electric / vibration
converters 6A, 6B are lower ends of the window glasses 9A, 9B so as to be housed in the door
body 10A, IOB even when the windows 9A, 9B are fully closed. Because it is attached to the part,
window 14A. There is no restriction on the view of 14 B and no deterioration in appearance.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram showing a circuit configuration of a vehicle acoustic device according to
an embodiment of the present invention, FIG. 2 is a perspective view of a vehicle installation state
showing a configuration of main parts of the device, and FIG. FIG. 4 is a diagram of frequency
transmission characteristics of the frequency by the device, and FIG. 4 is a diagram of frequency
transmission characteristics of a conventional general vehicle acoustic device.
1 sound signal source 2 Speaker drive power amplifier 3 L L (left) channel speaker 3 R R (right)
channel speaker 4 phase conversion circuit 5 ... Power amplifier 6A for driving electric /
vibration converter, 6B · · · Electric / vibration converter 8A, 8B door 9A, 9B · Window glass
0A0B door bother-Applicant Tsuda Co., Ltd.
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