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JPH0516734

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DESCRIPTION JPH0516734
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
vehicle acoustic device, and more particularly to a vehicle acoustic device using an acoustic
vibration driver unit attached to a panel member of the vehicle and using the panel member as
an acoustic diaphragm.
[0002]
2. Description of the Related Art A conventional vehicle acoustic apparatus of this type, which
uses an acoustic vibration driver unit attached to various panel members of a vehicle and uses
the panel member as an acoustic diaphragm, will be described below with reference to the
drawings.
[0003]
FIG. 3 is an external view of a conventional vehicle acoustic device disclosed in, for example,
Japanese Patent Application No. 56-59005.
[0004]
In FIG. 3, the conventional vehicle acoustic device mounts the acoustic excitation driver unit 11
at the center of the panel member 10 (the rear parcel shelf in the figure), and uses the panel
member 10 itself as the acoustic diaphragm. doing.
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1
As a vehicle audio system, a panel member 10 is used for bass range reproduction, and in
addition to this, middle and high range speakers 12 are provided at the left and right ends of the
rear parcel shelf, and these are used for medium and high range reproduction. (3 dimension
reproduction) system.
[0005]
Next, the conventional vehicle acoustic system shown in FIG. 3 will be described in more detail
according to the electrical system block diagram of the vehicle acoustic system shown in FIG.
[0006]
The audio signal output from the program source 13 which is an audio signal source such as a
cassette deck or a tuner is amplified by the vehicle amplifier 14 into the right channel amplifier
output 15 and the left channel amplifier output 16 Stereo reproduction is performed respectively
by the channel middle and high-pitched speaker 17 and the left channel middle and high-pitched
speaker 18.
[0007]
On the other hand, the bass range of the right channel amplifier output 15 and the left channel
amplifier output 16 outputted from the vehicle amplifier 14 is mixed by the mixer & filter 19 and
then amplified by the monaural main amplifier 20.
After that, the amplified signal is input to the voice coil 22 of the vibration driver unit 21 for
sound, and vibrates the vibration panel 23 (= panel member 10) having a function as a vibration
diaphragm for sound reproduction. It has become.
[0008]
By the way, in such an acoustic device for a vehicle, since the vibration panel 23 having a
function as a diaphragm as described above is a panel member for a vehicle, the vibration area
can be set sufficiently large as necessary. Since it is possible to perform powerful bass
reproduction comparable to a large aperture speaker unit, it is extremely effective as an acoustic
device of a vehicle with a limited installation space.
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[0009]
However, in this vehicle acoustic device, since the mass of the vibration panel 23 having a
function as a diaphragm is high compared to the diaphragm of a general speaker, the vibration
efficiency is poor, and the expected volume and sound quality It has the disadvantage that the
characteristics can not be obtained.
For this reason, as a vehicle acoustic device that solves such problems, for example, a vehicle
acoustic device shown in FIG. 5 has been proposed.
The acoustic apparatus for a vehicle shown in FIG. 5 comprises a panel component 24 in which a
portion of the panel member 10 is formed of a material having excellent acoustic characteristics,
and the acoustic excitation driver unit 11 is disposed on this, The panel component 24 itself is
used as a diaphragm to generate vibration.
According to this vehicle acoustic device, the vibration efficiency can be slightly improved as
compared with the one using the above-described normal panel member 10.
[0010]
However, even in the vehicle acoustic device shown in FIG. 5, since the panel component 24 has
its peripheral portion fixed to the panel member 10, the fixing of the peripheral portion prevents
deformation and sufficiently utilizes the characteristics of the material. There is a problem that
you can not do it. For this reason, as a vehicle acoustic device which solves such a problem, for
example, a vehicle acoustic device shown in Japanese Patent Publication No. 64-3434 has been
proposed. FIG. 6 is a view for explaining the configuration of a vehicle acoustic device proposed
in Japanese Patent Publication No. 64-3434, and FIG. 6 (A) is an appearance showing a panel
component of the vehicle acoustic device. FIG. 6 (B) is a plan view of the panel component, and
FIG. 6 (C) is a cross-sectional view of the panel component shown in FIG. 6 (B) along the line AA '.
[0011]
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In FIG. 6 (A), the panel component 24 has a flat rectangular shape, and each side edge portion is
provided with a notch-like opening 25 formed by cutting out the side edge portion. Then, as
shown in FIGS. 6 (B) and 6 (C), the panel constituent member 24 is integrated with the panel
member 10 by fixing the remaining portion 26 of the peripheral edge to a predetermined portion
of the panel member 10. It is supposed to be As described above, the vehicle acoustic device
disclosed in Japanese Patent Publication No. 64-3434 has a plurality of openings in the
periphery of the mounting portion of the acoustic excitation driver unit of the panel constituting
member, whereby the panel constituting member (or panel member) is used. It is characterized in
that the vibration efficiency of (which may be) is improved.
[0012]
That is, in this conventional vehicle acoustic device, when the panel member to which the
peripheral portion is fixed vibrates, the vicinity of the fixed portion of the peripheral portion is
deformed. This is characterized in that the panel member is caused to vibrate by repeating the
deformation of to reproduce the sound like a speaker unit. Therefore, in the case where the
entire peripheral edge of the panel member is fixed, the above-mentioned deformation is
prevented by this fixing, and there is a problem that the vibration efficiency is deteriorated. The
vehicle acoustic device disclosed in this publication is an improvement on this point.
[0013]
Here, in the vehicle acoustic device shown in FIG. 6, the notch-like opening 25 is formed in the
panel constituent member, and only the remaining part 26 of the peripheral edge generated by
the formation of the notch-like opening 25 is fixed. Because of this, the excitation force of the
acoustic drive unit for acoustics concentrates on the remaining part of the peripheral portion,
and the vibration efficiency is improved even with the same excitation force.
[0014]
However, in the conventional vehicle acoustic device including the vehicle acoustic device shown
in Japanese Patent Publication No. 64-3434, the mass of the panel member or the panel
component member is not limited to the usual audio. There is a problem that the vibration of the
panel member or the panel component does not follow the audio signal faithfully because of the
high mass compared with the mass of the diaphragm for the speaker used in the conventional
vehicle acoustic system. There is a problem that the device can not reproduce the sound faithful
to the acoustic signal source.
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[0015]
The above problems are described below.
That is, assuming that the driving force of the excitation source that excites the panel member or
the panel constituent member is F, and the mass of the vibrating body is m, the acceleration a
generated on the vibrating body is ... (a = F / m) ... (However, the above equation neglects
stiffness, damping etc. for simplicity).
[0016]
And, assuming that the driving force F of the vibration source is constant, the mass mb of the
panel member or panel constituent member is (mb >> ms) with respect to the mass ms of the
speaker diaphragm, and hence the panel member Alternatively, the acceleration of the vibration
of the panel component is (ab as as).
[0017]
Thus, in the conventional vehicle acoustic device, the acceleration ab of the vibration of the panel
member or the panel component is much smaller than the acceleration as of the speaker
diaphragm.
For this reason, the vibration of the panel member or the panel component does not faithfully
follow the acoustic signal source with large acceleration, for example, the signal of large
amplitude or high frequency.
[0018]
The present invention has been made to solve the above problems, and vibration of a panel
member or a panel component member is faithful to the acoustic signal source even for an
acoustic signal having a large acceleration such as high amplitude or high frequency. It is an
object of the present invention to provide a vehicle acoustic device that can be followed.
[0019]
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SUMMARY OF THE INVENTION In order to achieve the above object, a vehicle acoustic device
according to the present invention is provided with a sensor for detecting a vibration acceleration
or the like of a panel member or a panel constituent member, and A signal and a signal from an
acoustic signal source are compared, and drive control of the acoustic excitation driver unit is
performed based on the difference signal.
[0020]
Therefore, according to the vehicle acoustic device of the present invention, when the acoustic
signal is output from the acoustic signal source and the panel member or the panel component
vibrates, the vibration acceleration etc. are detected by the sensor and the detected value And the
signal from the acoustic signal source are compared, and the drive control of the acoustic
excitation driver unit is performed based on the difference signal, and the insufficiency of the
vibration in the panel member etc. is compensated according to the insufficiency. become.
[0021]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the
present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a circuit configuration of the vehicle acoustic device of the
present embodiment.
[0022]
In FIG. 1, the vehicle audio apparatus of this embodiment includes an audio source 31 which is
an audio signal source such as a cassette player, a CD player, DAT and the like, and an audio
signal from the audio source 31 is delayed. A delay circuit 32 for temporally matching the output
signal with the output signal of the differentiation circuit 33, a differentiation circuit 33 for
outputting a second-order derivative signal of the audio signal passed through the delay circuit
32, and an audio signal from the audio source 31 G which is attached to the power panel 34
which amplifies the power, the actuator 35 driven by the output of the power amplifier 34, the
body panel 36 vibrated by the actuator 35, and the body panel 36 to detect the vibration
acceleration of the body panel 36 Differential circuit 3 by amplifying the outputs of sensor 37
and G sensor 37 A gain-fixed sensor amplifier 38 for setting the output signal level to
approximately the same level as the output signal level, the vibration G of the body panel 36
which is the output signal of the sensor amplifier 38, and the audio signal which is the output
signal of the differentiation circuit 33; And a low pass filter 40 for cutting an audio signal outside
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the reproduction frequency band of the body speaker by the body panel 36.
[0023]
Next, the operation of the vehicle acoustic device of the present embodiment configured as
described above will be described using the signal waveform diagram of each part shown in FIG.
[0024]
First, a signal waveform diagram of an audio signal of the audio source 31 is shown in FIG.
When this audio signal is reproduced by the conventional panel member, the vibration
displacement of the body panel 36 becomes the waveform shown in FIG. 2 (B) as described in the
prior art.
Here, as is clear from the two figures, the two signal waveforms are different.
[0025]
However, in the vehicle acoustic device of the present embodiment, the audio signal which is the
output signal of the audio source 31 is amplified by the power amplifier 34, and the actuator 35
is vibrated to vibrate the body panel 36.
Although the G sensor 37 detects the vibration acceleration of the body panel 36, an output
signal waveform of the G sensor 37 is a waveform shown in FIG. 2C.
[0026]
On the other hand, the audio signal from the audio source 31 passes through the delay circuit 32
and becomes a second-order differential signal waveform by the differentiating circuit 33.
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This is shown in FIG. 2 (D).
[0027]
Then, the difference between the output signal of the sensor amplifier 38 shown in FIG. 2C and
the output signal of the differentiation circuit 33 shown in FIG. 2D is calculated by the difference
circuit 39 and output to the low pass filter 40. Ru.
The signal waveform of this difference circuit 39 is shown in FIG.
[0028]
The low-pass filter 40 cuts the output signal of the difference circuit 39 out of the audio signal
outside the reproduction frequency band of the body speaker. The cut audio signal has a
waveform shown in FIG.
[0029]
The output signal of such a low pass filter 40 has a positive value with respect to the audio signal
of the audio source 31 in the embodiment when the vibration displacement of the body panel 36
is small (indicated by an arrow in FIG. 2F). When it is large, it takes a negative value (shown by a
in FIG. 2 (F)). Therefore, the power amplifier 34 which feeds back this output signal is controlled
as shown in FIG. 2 (G).
[0030]
This means that when the vibration displacement of the body panel 36 is smaller than the audio
signal of the audio source 31, the amplifier gain of the power amplifier 34 is increased, and when
it is larger, the amplifier gain is reduced. And it turns out that the vibration of the body panel 36
can follow the audio signal of the audio source 31 well by such an action. The vibration
displacement of the body panel 36 fed back in this manner has a waveform shown in FIG.
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[0031]
In the embodiment described above, the G sensor 37 has been described as a sensor for detecting
vibration acceleration, but it may be a sensor for detecting vibration displacement or vibration
speed.
[0032]
When a sensor that detects vibration velocity is used, the differentiating circuit 33 may be a firstorder differentiating circuit, and when a sensor that detects vibration displacement is used, the
differentiating circuit 33 is unnecessary.
[0033]
As described above, according to the vehicle acoustic device of the present invention, a sensor for
detecting vibration acceleration or the like of a panel member or a panel component member is
provided, and a signal from the sensor and an acoustic signal source are provided. , And the drive
control of the acoustic excitation driver unit is performed based on the difference signal, so that
the vibration of the panel member or panel constituent member follows the acoustic signal well,
There is an effect that sound reproduction faithful to the sound signal source is possible.
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