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DESCRIPTION JP2000125389

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DESCRIPTION JP2000125389
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
car subwoofer system in the car audio field.
[0002]
[Background Art] A unique and brilliant self-assertion is particularly desired for the panel design
and the illumination display of car and audio equipment, and an independent subwoofer for an
automobile that sounds a large speaker dedicated to the low range in a cargo room etc.・ Many
enthusiasts focus on the illumination function for the appeal to the outside of the vehicle.
[0003]
The above-mentioned automotive sub-woofer system is usually designed to reproduce only the
band of at most 300 Hz or less, and it has a dedicated power amplifier internally or a separate
power amplifier. There is something like that.
In each case, only the low frequency range is extracted from the left and right signals to form one
monaural signal, and is reproduced separately from the left and right sounds by the dedicated
power amplifier and sub woofer (speaker).
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[0004]
The illumination function of the above-mentioned conventional vehicle-mounted sub-woofer
system often illuminates the edge portion of the speaker body, the diaphragm and the like lightly
in blue or red, and a cold cathode tube to secure sufficient illuminance as a light source Is
conventionally used.
[0005]
However, in the conventional in-vehicle sub-woofer system mounted in the above-mentioned
cargo room or the like, the user can not enjoy seeing the illumination display from the driver's
side, and the illumination function is It can not be checked whether it is working properly.
[0006]
On the other hand, depending on the music, if you want to listen only to the speaker system of
the car audio device without ringing the sub woofer, or if you want to adjust the volume of the
sub woofer, it is expected that this will often occur. It took time and effort to turn on / off the
power switch and adjust the volume control of the on-vehicle sub-woofer system itself.
[0007]
Furthermore, in the conventional vehicle-mounted sub-woofer system, the light emission mode of
the illumination display has only a mode in which one color is constantly lit, and is monotonous
and scarcely changed.
[0008]
The present invention has been made in consideration of the problems in the above-mentioned
conventional car sub-woofer system, and it is necessary to combine the control of the volume
adjustment means of the sub-woofer system main body and the illumination function with its
own illumination function. The present invention provides a novel on-vehicle sub-woofer system
to which a remote control device with an illumination function is added.
[0009]
SUMMARY OF THE INVENTION The present invention provides (1) a vehicle-mounted subwoofer system having an illumination function, including a plurality of light sources 12 having
different volume of light and having volume control means for the sub-woofer 9. And a remote
control device 20 with an illumination function having a structure in which the drive circuit 11 of
the light source 12 is built in a case 30 having a light diffusion transmission area W is wireconnected to the sub woofer system main body 10 The above problems are solved by providing
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an on-vehicle sub-woofer system.
[0010]
(2) In addition, the illumination mode of the illumination of the sub woofer system body 10 and
the remote control device 20 is switched to the plural patterns S1, S2, S3, S4 by switching the
input signal Sin to the drive circuits 7, 11 of the light sources 8, 12. The above problem is solved
by providing the on-vehicle sub-woofer system according to the above (1), characterized in that
the remote control device 20 is provided with the changeover switch SW2 arbitrarily selected
from the above.
[0011]
(3) In addition, a variable resistor whose volume control means by the remote control device 20
of the sub woofer 9 includes the DC control voltage Vc of the voltage control amplifier 1 of the
sub woofer system main body 10 in the remote control device 20 The above problem is solved
by providing the on-vehicle sub-woofer system according to the above (1) or (2), which is
controlled by the VR.
[0012]
(4) Also, the sound of the sub woofer 9 independent of the illumination function by turning on /
off the signal input to the standby terminal (STB) of the IC of the power amplifier 5 of the
subwoofer system main unit 10 to the remote control device 20 The above problem is solved by
providing the on-vehicle sub-woofer system according to the above (1), (2) or (3), characterized
in that the on / off switch SW1 of the present invention is provided.
[0013]
The light diffusion / transmission area W in the case 30 of the remote control device 20 is a
transparent or semitransparent (smoked) plastic panel surface portion, and a fine uneven groove
31 is provided at least on the surface side or the back side. It means a region where the light flux
of the light source 12 from the inside of the case 30 has the property of being refracted and
diffused in any direction.
[0014]
The light sources 8 and 12 of the illumination used in the present invention may be the same
cold cathode tubes as those in the prior art, but in view of the system configuration of the
present invention and power consumption, life, cost, etc. It is desirable to apply LED).
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[0015]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The preferred embodiments of the present
invention will be described based on the drawings.
[0016]
FIG. 1 is a block circuit diagram of an on-vehicle sub-woofer system according to the present
invention.
[0017]
FIG. 2 is a view showing a planar shape, a side surface shape, and an inner surface shape of a
front case for explaining the outer shape of the remote control device of the on-vehicle
subwoofer system according to the present invention.
[0018]
FIG. 3 is a view for explaining illumination mode switching means in the remote control device of
the above-mentioned in-vehicle sub woofer system.
[0019]
The in-vehicle sub woofer system shown in FIG. 1 is an in-vehicle sub woofer system having an
illumination function, and the side of the sub woofer system 10 surrounded by the broken line is
the audio input signal Vin. Voltage control amplifier 1 of input electronic volume, high pass filter
2, low pass filter 3, auto level controller 4, power amplifier 5, demonstration signal generation
circuit 6, LED drive circuit 7, multiple light sources of different emission colors As a light
emitting diode (LED) 8 and a sub woofer 9.
On the other hand, the remote control device 20 side surrounded by a broken line, which is the
first feature of the present invention, is connected to the sub-woofer system main body 10 by
wire, and light emitting diodes (a plurality of light sources of different emission colors) The LED
12 includes an LED drive circuit 11, an ON / OFF switch SW1 of the power amplifier 5, an
illumination light emission mode switch SW2, and a variable resistor VR for volume adjustment
of the sub woofer 9.
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[0020]
With the above system configuration, the remote control device 20 drawn from the sub woofer
system main unit 10 to the driver's seat via a wire drives the LED drive circuit 11 with the same
input signal Sin as the sub woofer system main unit 10 and has the same illumination Is
produced by the light emitting diode (LED) 12.
[0021]
The remote control device 20 is housed in a plastic case 30 having a transparent or translucent
(smoked) light diffusion transmission area W in an easy-to-grip shape as shown in FIG. The LEDs
1 to 5 are arranged on a circuit board (not shown) disposed on the bottom plate of the case, and
as shown in the top view of FIG. ), LED 2 (blue), LED 3 and LED 4 (amber) on the left and right,
and LED 5 (green) on the lower end thereof.
[0022]
On the inner surface side of the light diffusion / transmission area W in the case 30, a large
number of non-flat continuous streaky uneven grooves 31 as shown in FIG. 2 are provided, and
the luminous flux of the light emitting diodes LED1 to 5 going straight from below. Is refracted
into the transparent or translucent (smoked) light diffusion / transmission area W, and is
reflected, reflected, refracted, and diffracted, and diffused from the surface in multiple directions.
Therefore, when viewed from the outside, the light emission of the LEDs 1 to 5 appears to have a
spread rather than a point, and a high illumination display effect can be obtained.
Next, regarding the illumination function in the above system, the illumination mode of the
illumination of the sub woofer system main body 10 and the remote control device 20 to the
drive circuits 7 and 11 of the respective light sources 8 and 12 A second feature is that the
remote control device 20 is provided with a changeover switch SW2 arbitrarily selected from a
plurality of patterns (in this example, four patterns S1, S2, S3 and S4) by switching the input
signal Sin.
[0023]
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As a specific example of the light emission mode described above, a flash mode (S1 in which the
LEDs 1 to 5 are turned on / off according to music by inputting an audio signal ei from the auto
level controller 4 as shown in FIG. ) A mode in which only one is lit, two lights, or all lights are
turned on by inputting a certain constant voltage Vconst (for example, blue mode (S3) in which
only blue is lit; Vconst is appropriately made in advance) The subwoofer system body 10 side is
equipped with the demonstration signal generation circuit 6 of the astable multivibrator circuit,
and the output square wave has an H / L signal wave P with a time constant. And LED 1 to 5
repeat ON / OFF repeatedly in sequence as demo mode (S2), OFF mode (S4) where GND potential
is input and illumination function is not activated. It is.
In particular, since the flash mode (S1) changes the lighting / flashing of the LEDs 1 to 5 in
accordance with the change of the audio signal ei, it becomes a three-dimensional active multicolor illumination that changes infinitely to music.
With this system configuration, various choices of the illumination displays of the sub woofer
system body 10 and the remote control device 20 can be easily set at the driver's seat.
Next, as can be seen from FIG. 1, in the on-vehicle sub-woofer system, the volume adjustment
means by the remote control device 20 of the sub-woofer 9 of the sub-woofer system body 10 is
The third feature is that the DC control voltage Vc of the voltage control amplifier 1 of the subwoofer system main body 10 is controlled by a variable resistor VR provided on the remote
control device 20 side.
[0024]
Normally, the length of the connection wire (for example, DIN code) connecting the sub woofer
system main body 10 and the remote control device 20 is about 5 m, and the audio signal ei
itself is remotely controlled from the sub woofer system main body 10 side. If you take the
general volume adjustment means to adjust the volume by the control of the microcomputer and
then return to the main body side there will be an audio signal line of 10m, mixing of various
noises due to being for automotive use Will be triggered.
In addition, it will be forced to increase costs and extend the development period.
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[0025]
Therefore, in order to allow the remote control device 20 to perform volume adjustment without
deriving the audio signal ei to the remote control device 20, voltage control for low voltage
operation electronic volume as an electronic volume in the sub woofer system main body 10 The
volume of the sub woofer 9 is obtained by using the IC of the amplifier 1 (abbreviated VCA) and
deriving the DC control voltage Vc line thereof and adjusting the DC control voltage Vc with the
variable resistor VR provided in the remote control device 20. It is a means to control.
[0026]
In the above configuration, since the microcomputer need not be mounted on the side of the sub
woofer system 10, the configuration is simple, and there are advantages such as low cost and
shortened development period.
[0027]
The voltage control amplifier 1 used as the electronic volume is an amplifier that utilizes a
change in gain by changing the balance of the differential amplifier circuit with a DC control
voltage Vc from the outside, and is a variable transconductance (variable gm) An amplifier to be
called an operational amplifier (corresponding to claim 3 above).
[0028]
Next, as can be seen from FIG. 1, the on-vehicle sub-woofer system turns on / off the signal input
to the standby terminal (STB) of the IC of the power amplifier 5 of the sub-woofer system main
body 10 to the remote control device 20. A fourth feature is that a switch SW1 is provided to
turn on / off the sound of the sub woofer 9 independently of the illumination function of the sub
woofer system main body 10 and the remote control device 20 by turning off.
[0029]
With the above configuration, the illumination display of the sub woofer system main body 10
and the remote control device 20 can be enjoyed even when the sub woofer 9 is not sounded.
[0030]
As described above, the on-vehicle sub-woofer system of the present invention has the
illumination function on the remote control device 20 itself connected to the sub-woofer system
main body 10 having the illumination function as well as the illumination of both illumination
displays. Since the mode switching can be performed by the switch SW2, the same illumination
display as the sub woofer system main body side 10 can be enjoyed on the driver's seat.
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[0031]
Although the sub-woofer system main body 10 is of the power amplifier built-in type, it may be a
system combining the sub-woofer separate from the power amplifier 5 and other circuits.
[0032]
According to the configuration described above, the on-vehicle sub-woofer system according to
the present invention has the following excellent effects.
[0033]
(1) Since the remote control device with illumination function is connected to the sub woofer
system body by wire, you can enjoy the illumination display of the remote control device even at
the driver's seat, and the state of the illumination display on the body side I understand.
[0034]
(2) Since the light emission mode of the illumination display can be arbitrarily selected from a
plurality of patterns by the changeover switch, various displays can be enjoyed.
[0035]
(3) By controlling the DC control voltage of the VCA of the sub-woofer system main body from
the remote control device, the noise-free volume adjustment can be cost-reduced and the
development period can be shortened.
[0036]
(4) By providing the remote control device with a switch for switching ON / OFF only of the
sound of the sub woofer, the user can enjoy the illumination display without sounding the sub
woofer.
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