JPH0993689

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DESCRIPTION JPH0993689
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
volume control apparatus in which a main speaker and a subwoofer for outputting a low range
are connected.
[0002]
2. Description of the Related Art FIG. 2 is a schematic block diagram of a conventional volume
control apparatus. In FIG. 2, reference numeral 1 denotes a volume block that changes the level
of the audio signal, and an electronic volume, a mechanical volume, or the like is used as the
volume block 1. Reference numeral 2 denotes a bass / treble control unit (BASS / TRE control
unit) which sets the bass range and treble range of the audio signal according to the preference
of the user. Reference numeral 3 denotes a front / rear / left / right volume control unit which
sets the front / rear / left / right volume of the vehicle according to the preference of the user. A
power amplifier 4 drives the main speaker 5. Reference numeral 6 denotes a low pass filter that
cuts the high range of the audio signal output from the front / rear and left / right volume
control unit 3. A power amplifier 7 drives the subwoofer 8.
[0003]
In the conventional volume control apparatus configured as described above, the bass / treble
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control unit 2 adjusts the low range and high range of the audio signal according to the
preference of the user, or the front / rear / left / right volume control unit 3 You can adjust the
volume of the front, rear, left and right of the vehicle. In addition, the low frequency band of the
audio signal can be output by the subwoofer 8 independent of the main speaker 5 independently.
[0004]
However, in the above-mentioned conventional volume control apparatus, the volume of the main
speaker 5 and the subwoofer 8 are independently changed independently or the output of the
subwoofer 8 is stopped independently according to the preference of the user. There was a
problem that I could not let
[0005]
The present invention solves such conventional problems, and according to the preference of the
user, the volume of the main speaker and the subwoofer can be varied separately, and
furthermore, only the subwoofer can not be driven. It is an object of the present invention to
provide an excellent volume control device.
[0006]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
provides a main speaker for outputting a full range of an audio signal, a subwoofer for outputting
a low range of an audio signal, and variable volume of the main speaker. The control unit further
comprises control means for setting the volume of the subwoofer to a predetermined level in
accordance with the volume of the main speaker, and an operation unit for selecting the volume
of the subwoofer to a desired level.
[0007]
Thus, according to the present invention, the volume of the main speaker and the subwoofer can
be varied separately according to the preference of the user, and if the output of the subwoofer is
unnecessary, the subwoofer can be instantaneously Only the noise can be muted, and the range
of choices according to the user's preference can be expanded.
[0008]
An embodiment of the present invention will be described with reference to the drawings.
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FIG. 1 is a schematic block diagram showing the configuration of the volume control apparatus in
the present embodiment.
[0009]
In FIG. 1, the same components as those in FIG.
An operation unit 9 operates the operation unit 9 to change the main speaker 5 and the
subwoofer 8 to a desired volume according to the user's preference, or adjust the bass range, the
treble range, and the front and rear, right and left volume can do.
That is, the operation unit 9 is provided with a subwoofer switch capable of muting the volume of
the subwoofer 8 with respect to the volume of the main speaker 5 and sequentially selecting five
steps according to the magnitude of the output level.
Further, the operation unit 9 is provided with a main switch capable of setting the volume of the
main speaker 5 according to the user's preference.
[0010]
A CPU 10 controls the volume block 1, the bass / treble control unit 2, the front / rear / right /
right volume control unit 3, and the subwoofer level control unit 11 according to an instruction
from the operation unit 9. As shown in FIG. 2, the amount of attenuation of the volume of the
subwoofer 8 with respect to the volume of the main speaker 5, as shown in FIG. 2, is set in five
steps according to the amount of attenuation sequentially from the muted state. Data is stored in
advance. A subwoofer level control unit 11 controls the volume level of the subwoofer 8 based
on data set in a ROM in the CPU 10. Reference numeral 12 denotes a low pass filter that cuts the
high range of the audio signal controlled by the subwoofer level control unit 11.
[0011]
FIG. 3 is a characteristic diagram showing the relationship between the volume control voltage
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and the amount of attenuation for each step controlled by the CPU 10. As shown in FIG.
[0012]
Next, the operation of the above embodiment will be described.
The user sets the volume of the main speaker 5 by the main switch provided in the operation
unit 9 according to the user's preference, and operates the volume of the subwoofer 8 with
respect to the volume of the main speaker 5 by operating the subwoofer switch. select. Based on
a command from the operation unit 9, volume control voltage data for setting an output level of
the subwoofer 8 based on data stored in advance in the ROM is applied to the subwoofer level
control unit 11 in the CPU 10. The high frequency band of the audio signal controlled by the
subwoofer level control unit 11 is cut by the low pass filter 12, amplified by the power amplifier
7, and output from the subwoofer 8.
[0013]
As described above, according to the above embodiment, the volume of the subwoofer 8 suitable
for the volume of the main speaker 5 is set by setting the volume of the main speaker 5 and the
subwoofer 8 independently in advance according to the command of the operation unit. Can be
controlled automatically, or only the subwoofer 8 can be muted according to the preference of
the user.
[0014]
In the above embodiment, the data for setting the volume of the output level of the subwoofer 8
corresponding to the volume level of the main speaker 5 shown in FIG. 2 is also relative to the
volume of the subwoofer 8 when the volume of the main speaker 5 is small. When the volume of
the main speaker 5 is large, the volume of the subwoofer 8 is set to be relatively large. However,
the volume of the main speaker 5 can be adjusted by appropriately changing data set in advance.
The change in volume of the subwoofer 8 can also be changed to other characteristics.
[0015]
According to the present invention, as is apparent from the above embodiment, the volume of the
main speaker and the subwoofer can be varied independently according to the preference of the
user, and the output of the subwoofer is not required. In this case, only the subwoofer can be
muted instantly, and the range of selection can be expanded according to the preference of the
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user.
[0016]
Brief description of the drawings
[0017]
1 is a block diagram of a volume control apparatus according to an embodiment of the present
invention
[0018]
2 is a block diagram of a memory storing data for setting the volume of the subwoofer of the
embodiment.
[0019]
Fig. 3 Characteristic diagram showing the attenuation of the volume of the subwoofer of the
same embodiment
[0020]
Fig. 4 Block diagram of the conventional volume control device
[0021]
Explanation of sign
[0022]
Reference Signs List 1 volume block 2 bass / treble control unit 3 front / rear / left / right
volume control unit 5 main speaker 7 power amplifier 8 subwoofer 9 operation unit 10 CPU 11
subwoofer level control unit 12 low pass filter
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