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JP2000115880

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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 JP2000115880
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
3D woofer drive circuit, and more particularly to a 3D woofer drive circuit for driving a woofer
which is a speaker for low frequency range of a center of a 3D system.
[0002]
2. Description of the Related Art FIG. 3 is a circuit diagram showing an example of a conventional
3D system as a background of the present invention. The conventional 3D system 1 shown in
FIG. 3 comprises two input terminals 2a and 2b. Two inductors 3a and 3b are connected in series
between the two input terminals 2a and 2b. A capacitor 4 is connected between a connection
point of the two inductors 3a and 3b and a ground terminal serving as a reference potential. A
variable resistor 6 is connected to both ends of the capacitor 4 and the two speaker terminals 5
for woofer. A capacitor 7a and an inductor 8a are connected in series between one input terminal
2a and the ground terminal, and two speaker terminals 9a and 9a for L channel speakers are
connected to both ends of the inductor 8a. . Similarly, a capacitor 7b and an inductor 8b are
connected in series between the other input terminal 2b and the ground terminal, and two
speaker terminals 9b and 9b for R channel speakers are respectively connected to both ends of
the inductor 8b. Ru. In this 3D system 1, a woofer is connected to the speaker terminals 5 and 5,
an L channel medium to high range speaker is connected to the speaker terminals 9 a and 9 a,
and an R channel medium to high range speaker is connected to the speaker terminals 9 b and 9
b. Connected Then, in the 3D system 1, a sound signal of L channel is input between one input
terminal 2a and the ground terminal, and a sound signal of R channel is input between the other
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input terminal 2b and the ground terminal. As a result, the sound signal of the bass region among
the sound signals obtained by combining the sound signal of the L channel and the sound signal
of the R channel is converted to sound by the woofer, and the sound signal of the middle to high
frequency of the sound signal of the L channel is the L channel The medium-to-high range
speaker is converted into sound, and the medium-to-high range sound signal among the sound
signals of R channel is converted to a sound by the R-channel mid-to-high range speaker.
[0003]
FIG. 4 is a circuit diagram showing another example of a conventional 3D system as a
background of the present invention. The conventional 3D system 11 shown in FIG. 4 includes a
preamplifier 12. The preamplifier 12 has two input terminals 13a and 13b and two output
terminals 14a and 14b. Two resistors 15a and 15b are connected in series between the two
output terminals 14a and 14b of the preamplifier 12. A capacitor 16 is connected between a
connection point of the two resistors 15a and 15b and a ground terminal serving as a reference
potential. The two speaker terminals 18 and 18 for woofer are connected to both ends of the
capacitor 16 via the main amplifier 17 respectively. A capacitor 19a and a resistor 20a are
connected in series between one output terminal 14a of the preamplifier 12 and the ground
terminal, and both ends of the resistor 20a are for the L channel speaker via the main amplifier
21a. Two speaker terminals 22a, 22a are connected respectively. Similarly, a capacitor 19b and a
resistor 20b are connected in series between the other output terminal 14b of the preamplifier
12 and the ground terminal, and for the R channel speaker via the main amplifier 21b at both
ends of the resistor 20b. The two speaker terminals 22b and 22b are respectively connected. In
this 3D system 11, a woofer is connected to the speaker terminals 18 and 18, a middle to high
range speaker of L channel is connected to the speaker terminals 22a and 22a, and a middle to
high range speaker of R channel is connected to the speaker terminals 22b and 22b. Connected
Then, in this 3D system 11, a sound signal of L channel is input between one input terminal 13a
of the preamplifier 12 and the ground terminal, and a sound signal of R channel is input between
the other input terminal 13b of the preamplifier 12 and the ground terminal. Be done. As a
result, the sound signal of the bass region among the sound signals obtained by combining the
sound signal of the L channel and the sound signal of the R channel is converted to sound by the
woofer, and the sound signal of the middle to high frequency of the sound signal of the L channel
is the L channel The medium-to-high range speaker is converted into sound, and the medium-tohigh range sound signal among the sound signals of R channel is converted to a sound by the Rchannel mid-to-high range speaker.
[0004]
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In the 3D system 1 shown in FIG. 3, since the impedance of the woofer which is a load is low, the
inductors 3a and 3b and the capacitor 4 which constitute a network for the woofer have
inductance values and static values. The value of capacitance increases, the shape also increases,
and power also needs to be considered. Further, in the 3D system 1 shown in FIG. 3, the variable
resistor 6 for matching the level of the woofer needs to match the impedance with the woofer
which is a load, and becomes a special variable resistor, having a large shape and high cost. Also,
the power needs to be considered. Furthermore, in the 3D system 1 shown in FIG. 3, when
performing tone control at the level of the woofer, it is necessary to go to the woofer.
[0005]
The 3D system 11 shown in FIG. 4 requires a plurality of amplifiers such as a preamplifier and a
main amplifier to drive the woofer. Further, in the 3D system 11 shown in FIG. 4, the
configuration for driving the woofer is complicated, and the entire system is large and expensive.
[0006]
Therefore, a main object of the present invention is to provide a 3D woofer drive circuit which
can achieve miniaturization and cost reduction of a 3D system.
[0007]
SUMMARY OF THE INVENTION A 3D woofer drive circuit according to the present invention is a
3D woofer drive circuit for driving a woofer at the center of a 3D system, and comprises an L
channel sound signal and an R channel sound signal. It is a 3D woofer drive circuit including an
impedance element for combining and an amplifier for outputting a sound signal synthesized by
the impedance element to the woofer to drive the woofer.
In the 3D woofer drive circuit according to the present invention, the impedance element
includes a resistor, and a capacitor is connected to the resistor, and the resistor and the capacitor
constitute a low pass filter for limiting the frequency of the sound signal output to the woofer. It
may be done. In this case, a variable resistor having both an attenuator and a tone control
function may be used as the resistor used for the low pass filter.
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3
[0008]
In the 3D woofer drive circuit according to the present invention, the sound signal of L channel
and the sound signal of R channel are synthesized by the impedance element, the synthesized
sound signal is output to the woofer by the amplifier, the woofer is driven, and the sound is
generated by the woofer It is converted. Therefore, it is not necessary to form a network for the
woofer with inductors and capacitors, and a plurality of amplifiers are not required to drive the
woofer, and the configuration of the 3D woofer drive circuit becomes simple. Therefore, if the 3D
woofer drive circuit according to the present invention is used in a 3D system, the 3D system can
be miniaturized and cost reduced.
[0009]
The above object, other objects, features and advantages of the present invention will become
more apparent from the detailed description of the following embodiments of the present
invention made with reference to the drawings.
[0010]
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a circuit diagram showing an
example of a 3D system using a 3D woofer drive circuit according to the present invention.
The 3D system 30 shown in FIG. 1 includes two input terminals 32a and 32b.
[0011]
The speaker terminal 36a for the L channel speaker is connected to one input terminal 32a via
the power amplifier 34a.
[0012]
Similarly, a speaker terminal 36b for a speaker of R channel is connected to the other input
terminal 32b via the power amplifier 34b.
[0013]
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Between the output terminals of the two power amplifiers 34a and 34b, two resistors 38a and
38b as impedance elements constituting part of the 3D woofer drive circuit are connected in
series.
A capacitor 40 forming a low pass filter including the resistors 38a and 38b is connected
between a connection point of the two resistors 38a and 38b and a ground terminal serving as a
reference potential.
The two fixed terminals of the variable resistor 42 which also serves as an attenuator and a tone
control function are connected to both ends of the capacitor 40, respectively. The woofer speaker
terminal 46 is connected to the movable terminal of the variable resistor 42 through the buffer
amplifier 44. The buffer amplifier 44 includes an NPN transistor 44a and a PNP transistor 44b,
the base of the transistor 44a and the base of the transistor 44b are connected to the movable
terminal of the variable resistor 42, and the collector of the transistor 44a is a terminal of
positive potential. Connected, the collector of the transistor 44b is connected to the terminal of
negative potential, and the emitter of the transistor 44a and the emitter of the transistor 44b are
connected to the speaker terminal 46.
[0014]
In the 3D system 30 shown in FIG. 1, an L channel medium to high frequency range speaker is
connected between the speaker terminal 36a and the ground terminal, and an R channel medium
to high frequency range speaker is connected between the speaker terminal 36b and the ground
terminal. A woofer is connected between the terminal 46 and the ground terminal.
[0015]
Then, in the 3D system 30 shown in FIG. 1, the sound signal of the L channel is input between
one input terminal 32 a and the ground terminal, and the sound signal of the R channel is input
between the other input terminal 32 b and the ground terminal.
As a result, the sound signal of the L channel is amplified by the power amplifier 34a, and the
sound signal of the middle to high range among the amplified sound signals is converted to a
sound by the middle to high range speaker of the L channel. Further, the sound signal of the R
channel is amplified by the power amplifier 34b, and the sound signal of the middle to high
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range among the amplified sound signals is converted to a sound by the middle to high range
speaker of the R channel. Furthermore, the amplified L channel sound signal and the amplified R
channel sound signal are synthesized by the resistors 38a and 38b, and the sound signal of the
bass region among the synthesized sound signals is the resistors 38a and 38b, the capacitor 40.
The low-pass filter formed of the variable resistor 42 is output to the woofer through the buffer
amplifier 44, and the woofer is driven and converted to sound by the woofer.
[0016]
In the 3D system 30 shown in FIG. 1, it is not necessary to form a network for the woofer with
inductors and capacitors, and a plurality of amplifiers are not necessary to drive the woofer, and
the configuration of the 3D woofer drive circuit is simplified. . Therefore, in the 3D system 30,
downsizing and cost reduction can be achieved.
[0017]
Also, in the 3D system 30 shown in FIG. 1, the tone can be controlled by changing the level of the
sound from the woofer by moving the movable terminal of the variable resistor. In this case, the
level of the sound from the woofer increases as the resistance between the fixed terminal and the
movable terminal connected to the ground terminal in the variable resistor 42 increases. Also, let
R1 be the resistance of resistor 38a, R2 be the resistance of resistor 38b, C be the capacitance of
capacitor 40, and R3 be the resistance between the two fixed terminals of variable resistor 42:
The cutoff frequency fc of the low-pass filter consisting of the resistors 38a and 38b, the
capacitor 40 and the variable resistor 42 is fc = 1 / {2πC (R1 // R2 // R3)} (where R1 // R2 //
R3) Means 1 / {(1 / R1) + (1 / R2) + (1 / R3)}. )となる。 That is, even if the movable terminal of
the variable resistor 42 is moved, the cut-off frequency does not change, and by increasing or
decreasing the sound from the woofer, that is, the bass, an effect similar to the tone control is
exerted.
[0018]
FIG. 2 is a circuit diagram showing another example of a 3D system using a 3D woofer drive
circuit according to the present invention. Compared to the 3D system 30 shown in FIG. 1, the
3D system 30 shown in FIG. 2 is the connection point between the two resistors 38a and 38b
and the fixed terminal of the variable resistor 42 in the 3D woofer drive circuit for driving the
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woofer. And a low pass filter 48 is connected between them. The low pass filter 48 includes a
resistor 50 and a capacitor 52. The resistor 50 is connected between the connection point of the
two resistors 38a and 38b and the fixed terminal of the variable resistor 42, and the capacitor 52
is variable. It is connected between the connection point of the resistor 42 and the resistor 50
and the ground terminal serving as a reference potential.
[0019]
The 3D system 30 shown in FIG. 2 operates in the same manner as the 3D system 30 shown in
FIG. 1 and exhibits the same effects as the effects exhibited by the 3D system 30 shown in FIG.
[0020]
In each of the 3D systems 30 described above, a resistor is used as an impedance element for
combining the sound signal of the L channel and the sound signal of the R channel in the 3D
woofer drive circuit. Besides, inductors and capacitors may be used.
[0021]
In each of the 3D systems 30 described above, one or two stages of CR filters are used as low
pass filters in the 3D woofer drive circuit, but three or more stages of filters may be used as such
low pass filters, In addition to the CR filter, an LC filter may be used as such a low pass filter.
[0022]
Furthermore, although each 3D system 30 described above uses a variable resistor to control the
tone by changing the level of the sound from the woofer in the 3D woofer drive circuit, instead of
using such a variable resistor, a resistor Multiple resistances and switches may be used so that
the values switch in steps or the resistances are exchanged.
[0023]
According to the present invention, it is possible to obtain a 3D woofer drive circuit capable of
achieving downsizing and cost reduction of a 3D system.
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