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JPH11146486

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DESCRIPTION JPH11146486
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker system capable of making the electrical impedance of a speaker system constant
resistance when the cabinet is a bass reflex system or a Kelton system, and as a result, the sound
pressure level in the bass region can be increased. It is about
[0002]
That is, the present invention relates to a speaker system including a bass reflex cabinet, a dual
voice coil speaker unit, and an impedance compensation circuit for achieving constant resistance
of input impedance, or a Kelton cabinet, and a dual voice coil speaker The present invention
relates to a speaker system including a unit and an impedance compensation circuit for achieving
constant resistance of input impedance.
[0003]
2. Description of the Related Art A conventional speaker system will be described with reference
to FIGS. 7, 8 and 9. FIG.
FIG. 7 shows an example of the configuration of a conventional speaker system disclosed by
Watkins (WH Watkins "New Loudspeaker with Extended Bass" Audio, Dec. 1974, pp. 38-46)
using a dual voice coil, for example. It is intended to improve the sound radiation efficiency in the
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low frequency range.
[0004]
In FIG. 7, 11 and 12 are signal input terminals to speakers, 20 is a double voice coil speaker unit,
21 is a first voice coil, 22 is a second voice coil, and 23 is a bobbin for attaching a voice coil.
Reference numeral 30 denotes an impedance compensation circuit for making the electrical
impedance of the speaker system constant resistance.
[0005]
Next, the operation of the conventional speaker system will be described with reference to FIG. 8
and FIG.
FIG. 8 is a diagram showing the electrical impedance characteristic of the conventional speaker
system. FIG. 9 is a diagram showing sound pressure level characteristics of the conventional
speaker system.
[0006]
Generally, when there is no impedance compensation circuit 30, that is, when only the first voice
coil 21 is used, the electrical impedance of the speaker unit 20 becomes a parallel resonant
circuit, and as shown in FIG. A peak of characteristics is generated near the resonance frequency
f0.
[0007]
Therefore, the current flowing through the first voice coil 21 decreases near the lowest
resonance frequency f0, and the efficiency of the sound radiated from the speaker decreases.
[0008]
Therefore, in FIG. 7, a series resonant circuit including a coil L and a capacitance C is inserted in
series to the second voice coil 22, and a series resonant circuit to which the resistance of the
second voice coil 22 is added is connected in parallel to the first voice coil 21. By connecting to
the above, the electrical impedance is kept constant (constant resistance) to improve the sound
radiation efficiency.
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[0009]
FIG. 9 shows the change of the sound pressure level due to the presence or absence of the
impedance compensation circuit for the bass range.
As can be seen from FIG. 9, by making the impedance a constant resistance using the impedance
compensation circuit 30, an increase in the sound pressure level, that is, an increase in the sound
radiation efficiency can be seen near the lowest resonance frequency f0. It reaches several dB.
[0010]
In the conventional speaker system as described above, since the impedance compensation
circuit 30 is constituted by a series resonant circuit composed of the coil L, the capacitance C and
the resistance of the second voice coil 22, The constant resistance can be realized only when the
electrical impedance of the first voice coil 21 is a parallel resonant circuit.
That is, the reproduction method is limited to a method in which a closed cabinet or a speaker
unit is used alone.
Therefore, the conventional speaker system shown in FIG. 7 has a problem that it can not be
applied to bass reflex cabinets currently used generally or other systems.
[0011]
The present invention was made to solve the above-mentioned problems, and when the cabinet is
a bass reflex system or a Kelton system, the electrical impedance of the speaker system is made
constant resistance, and as a result, the sound pressure level in the low frequency range The
purpose is to get a speaker system that can be lifted.
[0012]
A speaker system according to the present invention comprises a bass reflex cabinet, and a dual
voice coil speaker unit mounted on the cabinet and having first and second voice coils to which
an input signal is applied. An acoustic port provided in the cabinet, and an impedance
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compensation circuit inserted between an input terminal to which the input signal is applied and
the second voice coil in order to make the input impedance constant-resistance, Assuming that
the inductances L1 and L2, which are circuit elements of the impedance compensation circuit,
the capacitances C1 and C2 and the resistances rC1 and rC2, respectively, the impedance Zc of
the impedance compensation circuit is represented by the equation (1).
[0013]
In the speaker system according to the present invention, the resonance angular frequency of the
dual voice coil speaker unit is ω0, the equivalent mass of the dual voice coil speaker unit is m0,
and the equivalent mechanical compliance of the dual voice coil speaker unit is C0. The electrical
sharpness of the dual voice coil speaker unit is Q0, the mechanical sharpness of the dual voice
coil speaker unit is Qm, and the ratio of the force coefficient of the second voice coil to the first
voice coil is α, Cb, air compliance by volume in the bass reflex cabinet, rb equivalent mechanical
resistance by volume in the bass reflex cabinet, ml equivalent weight of an acoustic port seen
from the double voice coil speaker unit, the 2 Sound seen from a dual voice coil speaker unit
Assuming that the equivalent mechanical resistance of the gate is rl, the resistance of the first
voice coil is RV1, and the resistance of the second voice coil is RV2, .beta. = Ml / m0, .gamma.b =
C0 / Cb, Qb = .omega.0m0 / The resistance RV2 of the second voice coil and the constants of the
circuit elements of the impedance compensation circuit are in the relation of the expressions (3)
to (9) under the condition of rb and Ql = ω0m0 / rl.
[0014]
A speaker system according to the present invention includes a bass reflex cabinet, a dual voice
coil speaker unit attached to the cabinet and having first and second voice coils to which an input
signal is applied, and an acoustic port provided to the cabinet And an impedance compensation
circuit inserted between the input terminal to which the input signal is applied and the second
voice coil in order to make the input impedance constant-resistance, which is a circuit element of
the impedance compensation circuit Assuming that the inductance is L1 and L2 and the
capacitances are C1 and C2, the impedance Zc of the impedance compensation circuit is
represented by the equation (2).
[0015]
A speaker system according to the present invention includes a Kelton system cabinet, a dual
voice coil speaker unit attached to the cabinet and having first and second voice coils to which an
input signal is applied, and an acoustic port provided in the cabinet And an impedance
compensation circuit inserted between the input terminal to which the input signal is applied and
the second voice coil in order to make the input impedance constant-resistance, which is a circuit
element of the impedance compensation circuit Assuming that the inductance is L1 and L2, the
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capacitance is C1 and C2, and the resistances are rC1 and rC2, the impedance Zc of the
impedance compensation circuit is expressed by the equation (1).
[0016]
In the speaker system according to the present invention, the resonance angular frequency of the
dual voice coil speaker unit is ω0, the equivalent mass of the dual voice coil speaker unit is m0,
and the equivalent mechanical compliance of the dual voice coil speaker unit is C0. The electrical
sharpness of the dual voice coil speaker unit is Q0, the mechanical sharpness of the dual voice
coil speaker unit is Qm, and the ratio of the force coefficient of the second voice coil to the first
voice coil is α, Cb equivalent mechanical compliance by the double voice coil speaker unit rear
space, rb equivalent magnetic resistance by the air chamber in the dual voice coil speaker unit
rear space by rb, the dual voice coil speaker unit front air chamber Equivalent machine
compliance Cf, 2 above The equivalent mechanical resistance by the air chamber of the voice coil
speaker unit rf, the equivalent mass of the acoustic port seen from the double voice coil speaker
unit is ml, and the equivalent mechanical resistance of the acoustic port seen from the double
voice coil speaker unit rl, when the resistance of the first voice coil is RV1 and the resistance of
the second voice coil is RV2, β = ml / m0, γb = Cb / C0, γl = Cl / C0, Qb = ω0m0 / rb , The
resistance RV2 of the second voice coil and the constant of each circuit element of the impedance
compensation circuit are in the relationship of the equation (14) to the equation (20) under the
condition of Qf = ω0m0 / rf and Ql = ω0m0 / rl. It is a thing.
[0017]
A speaker system according to the present invention includes a Kelton system cabinet, a dual
voice coil speaker unit attached to the cabinet and having first and second voice coils to which an
input signal is applied, and an acoustic port provided in the cabinet And an impedance
compensation circuit inserted between the input terminal to which the input signal is applied and
the second voice coil in order to make the input impedance constant-resistance, which is a circuit
element of the impedance compensation circuit Assuming that the inductance is L1 and L2 and
the capacitances are C1 and C2, the impedance Zc of the impedance compensation circuit is
represented by the equation (2).
[0018]
Furthermore, in the speaker system according to the present invention, the impedance
compensation circuit is connected to a first series circuit of an inductance L1 and a capacitance
C1, and the first series circuit, and a second of the resistor rC1 and the capacitance C2. A series
circuit is formed of a parallel circuit in which a third series circuit of a resistor rC2 and an
inductance L2 is connected in parallel.
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[0019]
Furthermore, in the speaker system according to the present invention, the impedance
compensation circuit is constituted by a series circuit of an inductance L1 and a capacity C1, and
a parallel circuit of an inductance L2 and a capacity C2 while being connected to the series
circuit. is there.
[0020]
DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment
A speaker system according to Embodiment 1 of the present invention will be described with
reference to FIGS. 1 to 5.
FIG. 1 is a diagram showing a configuration of a speaker system according to Embodiment 1 of
the present invention.
In the drawings, the same reference numerals indicate the same or corresponding parts.
[0021]
In FIG. 1, 11 and 12 are signal input terminals to speakers, 20 is a double voice coil speaker unit,
21 is a first voice coil, 22 is a second voice coil, and 23 is a bobbin for attaching a voice coil.
Reference numeral 30A denotes an impedance compensation circuit for making the electrical
impedance of the speaker system constant resistance, 40 an acoustic port, and 100 a bass reflex
cabinet.
[0022]
Here, as shown in FIG. 1, the “bass reflex type cabinet” is a cabinet 100 having a structure in
which the rear space of the speaker unit 20 is acoustically coupled to an acoustic port 40 that
emits sound to the outside.
[0023]
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Next, the operation of the first embodiment will be described with reference to FIGS.
FIG. 2 is a diagram showing the electrical impedance characteristic of the bass reflex type
speaker system according to the first embodiment of the present invention.
[0024]
Conventionally, the electrical impedance of a bass reflex speaker system typically produces two
peaks around the anti-resonance frequency fr, as shown in FIG.
This method corresponds to the case where only the first voice coil 21 is used in FIG. 1, and the
electrical impedance of the speaker unit 20 (speaker system) is inputted because it generates two
peaks before and after the antiresonance frequency fr. Current corresponding to the rise in
impedance, which reduces the efficiency of the sound emitted from the speaker.
[0025]
Therefore, in order to prevent this reduction in efficiency, an impedance compensation circuit
30A of impedance Zc is inserted in series in the second voice coil 22, which makes the electrical
impedance of the speaker system a constant resistance.
[0026]
Here, when the bass reflex cabinet 100 is used as the impedance compensation circuit 30A, the
impedance Zc is determined so that the electrical impedance of the speaker system becomes a
constant resistance.
That is, since the electric impedance of the first voice coil 21 is represented in FIG. 2, each
element is selected so as to cancel the peak of the characteristic.
The impedance compensation circuit 30A is generally represented by FIG. 3 and is represented
by the following equation (1) in mathematical expression.
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[0027]
In the above equation (1), the resistances rC1 and rC2 are generally smaller than jωL2 and 1 /
(jωC2).
Therefore, even if the circuit of FIG. 3 is replaced approximately with the circuit of FIG. 4,
substantially the same effect can be obtained.
The circuit of FIG. 4 is represented by the following equation (2) in mathematical expression.
[0028]
Here, each element constant of the impedance compensation circuit 30A depends on the size of
the bass reflex cabinet 100 to be used, but the condition for completely making the electrical
impedance of the speaker system constant constant is uniquely determined. Ru.
[0029]
When the bass reflex cabinet 100 is used, the resonant angular frequency of the double voice
coil speaker unit is “ω0”, the equivalent mass of the double voice coil speaker unit is “m0”,
and the equivalent machine compliance of the double voice coil speaker unit is “m0”. “C0”,
the electrical sharpness of the dual voice coil speaker unit “Q0”, the mechanical sharpness of
the dual voice coil speaker unit “Qm”, the force of the second voice coil 22 with respect to the
first voice coil 21 The coefficient ratio is “α”, the compliance of air by volume in the bass
reflex cabinet 100 is “Cb”, the equivalent mechanical resistance by volume in the bass reflex
cabinet 100 is “rb”, and the acoustic port 40 seen from the speaker unit 20 An acoustic port
seen from the speaker unit 20 with the equivalent mass “ml” Assuming that the equivalent
mechanical resistance of 40 is "rl" and the resistance of the first voice coil 21 is "RV1", the
resistance RV2 of the second voice coil 22, the inductances L1 and L2 of the compensation
circuit element, and the capacitances C1 and C2 The resistances rC1 and rC2 are obtained from
the following formulas (3) to (9).
[0030]
However, β, γb, Qb and Ql in the above formulas are as shown in the following formulas (10) to
(13).
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[0031]
FIG. 5 is a diagram showing calculation results comparing the change in the sound pressure level
characteristic and the electrical impedance characteristic depending on the presence or absence
of the impedance compensation circuit 30A in the bass range.
Referring to FIG. 5, the electric impedance is made constant resistance by the impedance
compensation circuit 30A (electric impedance characteristic curve of thin line → electric
impedance characteristic curve of thick line), and the sound pressure level rises around the
antiresonance frequency fr. It can be seen that the sound pressure level characteristic curve of a
thin line → the sound pressure level characteristic curve of a thick line).
[0032]
As described above, in the speaker system using the dual voice coil speaker unit according to the
first embodiment, one dual voice coil speaker unit 20 attached to the bass reflex cabinet 100 and
the dedicated impedance compensation circuit 30A are used. And the input impedance as a
speaker system can be made into a constant resistance.
[0033]
Therefore, the input to the speaker system is constantly supplied constantly, which has an effect
of improving the sound radiation efficiency near the anti-resonance frequency of the bass reflex
speaker system.
[0034]
Second Embodiment
A speaker system according to Embodiment 2 of the present invention will be described with
reference to FIG.
FIG. 6 is a diagram showing a configuration of a speaker system according to Embodiment 2 of
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the present invention.
[0035]
In FIG. 6, 11 and 12 are signal input terminals to speakers, 20 is a double voice coil speaker unit,
21 is a first voice coil, 22 is a second voice coil, and 23 is a bobbin for attaching a voice coil. 30B
is an impedance compensation circuit for making the electrical impedance of the speaker system
constant resistance, 40 is an acoustic port, and 200 is a Kelton cabinet.
[0036]
Here, the “Kelton system cabinet” means an acoustic port 40 in which the space in the front of
the speaker unit 20 radiates sound to the outside while the space behind the speaker unit 20
mounted inside is sealed. It is the cabinet 200 of the combined structure.
[0037]
Next, the operation will be described.
The electrical impedance characteristic of the Kelton speaker system produces two peaks before
and after the anti-resonance frequency fr as shown in FIG.
[0038]
Here, the anti-resonance frequency fr in the Kelton system is an acoustic resonance frequency
determined by the acoustic space at the front of the speaker unit 20 and the acoustic port 40.
[0039]
Therefore, this method corresponds to the case where only the first voice coil 21 is used in FIG.
6, and the electrical impedance of the speaker unit 20 (speaker system) is input because it
generates two peaks before and after the antiresonance frequency fr. Current decreases with the
rise in impedance, and the efficiency of the sound emitted from the speaker decreases.
[0040]
Therefore, in order to prevent the decrease in the efficiency of the sound, an impedance
compensation circuit 30B for converting the electrical impedance of the speaker system into a
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constant resistance is inserted in series in the second voice coil 22.
[0041]
Here, when the Kelton cabinet 200 is used as the impedance compensation circuit 30B, the
impedance Zc is determined so that the electrical impedance of the speaker system becomes a
constant resistance.
[0042]
This impedance compensation circuit 30B is generally represented in FIG. 3 as in the case of the
bass reflex speaker system, and the mathematical expression of the impedance Zc is also the
same as the above equation (1).
[0043]
Furthermore, regarding the above equation (1), the resistances rC1 and rC2 are generally smaller
than jωL2 and 1 / (jωC2).
Therefore, even if the circuit of FIG. 3 is replaced approximately with the circuit of FIG. 4,
substantially the same effect can be obtained.
That is, the circuit of FIG. 4 is identical to the above equation (2) in mathematical expression.
[0044]
Here, each element constant of the impedance compensation circuit 30B depends on the size of
the Kelton system cabinet 200 to be used, but the condition for completely making the electrical
impedance of the speaker system constant is uniquely determined.
[0045]
When the Kelton cabinet 200 is used, the resonant angular frequency of the dual voice coil
speaker unit is “ω0”, the equivalent mass of the dual voice coil speaker unit is “m0”, and
the equivalent mechanical compliance of the dual voice coil speaker unit is “m0”. “C0”, the
electrical sharpness of the dual voice coil speaker unit “Q0”, the mechanical sharpness of the
dual voice coil speaker unit “Qm”, the force of the second voice coil 22 with respect to the first
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voice coil 21 Coefficient ratio “α”, equivalent mechanical compliance by speaker unit rear
space “Cb”, equivalent mechanical resistance by air chamber in speaker unit rear space “rb”,
equivalent mechanical compliance by speaker unit front air chamber Cf ", equivalent mechanical
resistance by the front air chamber of the speaker unit "Rf", the equivalent mass of the acoustic
port 40 seen from the speaker unit 20 "ml", the equivalent mechanical resistance of the acoustic
port 40 seen from the speaker unit 20 "rl", the resistance of the first voice coil 21 "RV 1 When
the resistance R2 of the second voice coil 22, the inductances L1 and L2, the capacitances C1
and C2, and the resistances rC1 and rC2 of the compensation circuit element are obtained from
the following expressions (14) to (20).
[0046]
However, β, γb, γf, Qb, Qf and Ql in the above formulas are as shown in the following formulas
(21) to (26).
[0047]
As described above, in the speaker system using the dual voice coil speaker unit according to the
second embodiment, the impedance of one dual voice coil speaker unit 20 attached to the Kelton
system cabinet 200 and the dedicated impedance is used. A compensation circuit 30B is
provided, and the input impedance as a speaker system can be made constant resistance.
[0048]
Therefore, the input to the speaker system is constantly supplied constantly, which has an effect
of improving the sound radiation efficiency near the anti-resonance frequency of the Kelton
speaker system.
[0049]
As described above, the speaker system according to the present invention is a dual voice coil
speaker unit having a bass reflex cabinet and first and second voice coils attached to the cabinet
and to which an input signal is applied. And an acoustic port provided in the cabinet, and an
impedance compensation circuit inserted between an input terminal to which the input signal is
applied and the second voice coil in order to make the input impedance constant-resistor.
Assuming that the inductances L1 and L2, the capacitances C1 and C2, and the resistances rC1
and rC2 of the impedance compensation circuit, the impedance Zc of the impedance
compensation circuit is expressed by the equation (1), the speaker The input impedance as a
system can be made An effect that it is possible to improve the sound radiation efficiency near
resonance frequency.
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[0050]
In the speaker system according to the present invention, as described above, the resonant
angular frequency of the dual voice coil speaker unit is ω0, the equivalent mass of the dual voice
coil speaker unit is m0, and the dual voice coil speaker unit is Equivalent mechanical compliance
C0, electrical sharpness of the dual voice coil speaker unit Q0, mechanical sharpness of the dual
voice coil speaker unit Qm, the second voice coil relative to the first voice coil Ratio of force
factor α, compliance of air by volume in the bass reflex cabinet Cb, equivalent mechanical
resistance by volume in the bass reflex cabinet rb, equivalent mass of acoustic port seen from the
double voice coil speaker unit The ml, the double voice coil speaker Assuming that the equivalent
mechanical resistance of the acoustic port seen from the knit is rl, the resistance of the first voice
coil is RV1, and the resistance of the second voice coil is RV2, β = ml / m0, γb = C0 / Cb, Since
the resistance RV2 of the second voice coil and the constant of each circuit element of the
impedance compensation circuit are in the relationship of the equations (3) to (9), on condition
that Qb = ω0 m0 / rb and Q1 = ω0 m0 / rl. The input impedance as the speaker system can be
made to be a constant resistance, and the sound radiation efficiency near the antiresonance
frequency can be improved.
[0051]
As described above, the speaker system according to the present invention includes the bass
reflex type cabinet, the dual voice coil speaker unit having the first and second voice coils
attached to the cabinet and to which the input signal is applied, and the cabinet The impedance
compensation circuit includes: an acoustic port provided; and an impedance compensation circuit
interposed between an input terminal to which the input signal is applied and the second voice
coil in order to make the input impedance constant-resistance. The inductance Zc of the
impedance compensation circuit is expressed by the equation (2), where L1 and L2 are
inductances of the circuit elements and C1 and C2 are capacitances, so the input impedance as a
speaker system is made constant resistance Can improve the sound radiation efficiency near the
antiresonance frequency. An effect that can be.
[0052]
As described above, the speaker system according to the present invention includes the Kelton
system cabinet, the dual voice coil speaker unit having the first and second voice coils attached
to the cabinet and to which the input signal is applied, and the cabinet The impedance
compensation circuit includes: an acoustic port provided; and an impedance compensation circuit
interposed between an input terminal to which the input signal is applied and the second voice
coil in order to make the input impedance constant-resistance. When the inductance of the
circuit element is L1, L2, the capacitances are C1, C2, and the resistances are rC1, rC2, the
impedance Zc of the impedance compensation circuit is expressed by the equation (1). The
08-05-2019
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impedance can be made constant resistance, near the anti-resonance frequency An effect that it
is possible to improve the sound radiation efficiency.
[0053]
In the speaker system according to the present invention, as described above, the resonant
angular frequency of the dual voice coil speaker unit is ω0, the equivalent mass of the dual voice
coil speaker unit is m0, and the dual voice coil speaker unit is Equivalent mechanical compliance
C0, electrical sharpness of the dual voice coil speaker unit Q0, mechanical sharpness of the dual
voice coil speaker unit Qm, the second voice coil relative to the first voice coil Force factor ratio
α, equivalent mechanical compliance by the double voice coil speaker unit rear space Cb,
equivalent mechanical resistance by the air chamber in the double voice coil speaker unit rear
space, rb, the dual voice coil speaker unit Equivalent mechanical compressor with front air
chamber Ans as Cf, equivalent mechanical resistance by the air chamber at the front of the
double voice coil speaker unit as rf, equivalent weight of an acoustic port seen from the double
voice coil speaker unit as ml, as seen from the double voice coil speaker unit Assuming that the
equivalent mechanical resistance of the acoustic port is rl, the resistance of the first voice coil is
RV1, and the resistance of the second voice coil is RV2, β = ml / m0, γb = Cb / C0, γl = Cl /
The resistance RV2 of the second voice coil and the constant of each circuit element of the
impedance compensation circuit are expressed by the equation (14) to the equation under the
condition of C0, Qb = ω0m0 / rb, Qf = ω0m0 / rf, Ql = ω0m0 / rl With the relation of (20), the
input impedance as the speaker system can be made to be a constant resistance, and the sound
radiation efficiency near the antiresonance frequency can be improved. Play an effect.
[0054]
As described above, the speaker system according to the present invention includes the Kelton
system cabinet, the dual voice coil speaker unit having the first and second voice coils attached
to the cabinet and to which the input signal is applied, and the cabinet The impedance
compensation circuit includes: an acoustic port provided; and an impedance compensation circuit
interposed between an input terminal to which the input signal is applied and the second voice
coil in order to make the input impedance constant-resistance. The inductance Zc of the
impedance compensation circuit is expressed by the equation (2), where L1 and L2 are
inductances of the circuit elements and C1 and C2 are capacitances, so the input impedance as a
speaker system is made constant resistance Can improve the sound radiation efficiency near the
antiresonance frequency. An effect that can be.
[0055]
Furthermore, in the speaker system according to the present invention, as described above, the
impedance compensation circuit is connected to the first series circuit of the inductance L1 and
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the capacitance C1 and the first series circuit, and the resistor rC1 and the capacitance Since the
third series circuit of the resistor rC2 and the inductance L2 is connected in parallel in the
second series circuit of C2, the input impedance as the speaker system can be made to be a fixed
resistance, and it is possible to There is an effect that the sound radiation efficiency near the
resonance frequency can be improved.
[0056]
Furthermore, in the speaker system according to the present invention, as described above, the
impedance compensation circuit is connected to a series circuit of an inductance L1 and a
capacitance C1, and to a series circuit of the inductance L2 and a capacitance C2. With the
configuration, the input impedance as the speaker system can be made to have a constant
resistance, and the sound radiation efficiency near the antiresonance frequency can be improved.
[0057]
Brief description of the drawings
[0058]
FIG. 1 is a diagram showing a configuration of a bass reflex speaker system according to
Embodiment 1 of the present invention.
[0059]
FIG. 2 is a diagram showing the electrical impedance characteristic of the bass reflex type
speaker system according to the first embodiment of the present invention.
[0060]
FIG. 3 is a diagram showing an impedance compensation circuit of a bass reflex speaker system
according to a first embodiment of the present invention.
[0061]
FIG. 4 is a diagram showing another impedance compensation circuit of the bass reflex speaker
system according to the first embodiment of the present invention.
[0062]
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FIG. 5 is a diagram comparing changes in sound pressure level characteristics and electrical
impedance characteristics depending on the presence or absence of a compensation circuit in the
bass range of the bass reflex speaker system according to Embodiment 1 of the present
invention.
[0063]
FIG. 6 is a diagram showing the configuration of a Kelton system speaker system according to a
second embodiment of the present invention.
[0064]
FIG. 7 is a diagram showing a configuration of a conventional speaker system.
[0065]
FIG. 8 is a diagram showing an electrical impedance characteristic of the conventional speaker
system.
[0066]
FIG. 9 is a diagram showing sound pressure level characteristics of the conventional speaker
system.
[0067]
Explanation of sign
[0068]
11, 12 signal input terminals, 20 double voice coil speaker units, 21 first voice coil, 22 second
voice coil, 23 bobbins, 30A, 30B impedance compensation circuit, 40 acoustic ports, 100 bass
reflex cabinet, 200 Kelton Method cabinet.
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