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JPH11146485

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH11146485
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention makes the
electrical impedance of the speaker system constant when the cabinet is a passive radiator
system or a Kelton system equipped with a passive radiator, and as a result, the sound pressure
level in the bass region is increased. It relates to a speaker system that can be
[0002]
That is, the present invention relates to a speaker system including a passive radiator type
cabinet, a dual voice coil speaker unit, and an impedance compensation circuit for achieving a
constant resistance of input impedance, or a Kelton type cabinet having a passive radiator. The
present invention relates to a speaker system including a dual voice coil speaker 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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1
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 a passive radiator type cabinet or other types.
[0011]
The present invention has been made to solve the above-mentioned problems, and when the
cabinet is a passive radiator system or a Kelton system equipped with a passive radiator, the
electrical impedance of the speaker system is made constant, and as a result, it is low. The
purpose is to obtain a speaker system capable of increasing the sound pressure level in the
sound range.
[0012]
A speaker system according to the present invention is a dual voice coil speaker unit having a
passive radiator type cabinet, and first and second voice coils attached to the cabinet and to
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which an input signal is applied. And a passive radiator attached to 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-resistance.
When the inductance which is a circuit element of the impedance compensation circuit is L1, L2,
the capacitances are C1, C2, C3 and the resistances are rC1, rC2, the impedance Zc of the
impedance compensation circuit is represented by the equation (1) It is.
[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, compliance of air by volume in the passive radiator system cabinet, rb,
equivalent mechanical resistance by volume in the passive radiator system cabinet, mp,
equivalent mass of the passive radiator viewed from the speaker unit, the speaker unit Said from
the point of view Assuming that the equivalent mechanical compliance of the parasitic radiator is
Cp, the equivalent mechanical resistance of the passive radiator seen from the speaker unit is rp,
the resistance of the first voice coil is RV1, and the resistance of the second voice coil is RV2,
then β The resistance RV2 of the second voice coil and each circuit element of the impedance
compensation circuit, provided that the condition is = mp / m0, γb = Cb / C0, γp = Cp / C0, Qb
= ω0m0 / rb, Qp = ω0m0 / rp The constant of the equation (3) to (10).
[0014]
A speaker system according to the present invention comprises: a passive radiator type cabinet; a
dual voice coil speaker unit mounted on the cabinet and having first and second voice coils to
which an input signal is applied; and a passive mounted on the cabinet A circuit element of the
impedance compensation circuit, which includes a radiator 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-resistance; When a certain inductance
is L1, L2 and capacitances are C1, C2, C3, the impedance Zc of the impedance compensation
circuit is represented by the equation (2).
[0015]
A speaker system according to the present invention comprises a Kelton cabinet, a dual voice coil
speaker unit mounted on the cabinet and having first and second voice coils to which an input
signal is applied, and a passive radiator mounted on the cabinet And an impedance compensation
circuit inserted between the input terminal to which the input signal is applied and the second
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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, L2, the capacitances are
C1, C2, C3, and the resistances are rC1, rC2, the impedance Zc of the impedance compensation
circuit is expressed by 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 rear space of the dual voice coil
speaker unit, rb equivalent mechanical resistance by an air chamber in the rear space of the dual
voice coil speaker unit, front of the dual voice coil speaker unit Cf equivalent mechanical
compliance by air chamber, The equivalent mechanical resistance by the front air chamber of the
dual voice coil speaker unit is rf, the equivalent mass of the passive radiator viewed from the dual
voice coil speaker unit is mp, and the passive viewed from the dual voice coil speaker unit The
equivalent mechanical compliance of the radiator is Cp, the equivalent mechanical resistance of
the passive radiator seen from the double voice coil speaker unit is rp, the resistance of the first
voice coil is RV1, and the resistance of the second voice coil is RV2 When it is determined that β
= mp / m0, γb = Cb / C0, γf = Cf / C0, γp = Cp / C0, Qb = ω0 m0 / rb, Qf = ω0 m0 / rf, Qp =
ω0 m0 / rp as a condition The resistance RV2 of the voice coil of No. 2 and the constant of each
circuit element of the impedance compensation circuit are in the relationship of the equations
(16) to (23). is there.
[0017]
A speaker system according to the present invention comprises a Kelton cabinet, a dual voice coil
speaker unit mounted on the cabinet and having first and second voice coils to which an input
signal is applied, and a passive radiator mounted on 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 When the inductance is L1, L2 and the capacitances are C1,
C2, C3, 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
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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, a capacitor
C3 and an inductance L2 is connected in parallel.
[0019]
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 capacitance C3 and the inductance L2. It is
configured of a parallel circuit in which a capacitor C2 is connected in parallel to a series circuit.
[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, 40 denotes a passive radiator, and 100 denotes a
passive radiator type cabinet.
[0022]
Here, as shown in FIG. 1, the “passive radiator type cabinet” is a cabinet 100 having a
structure in which the rear space of the speaker unit 20 is acoustically coupled to the passive
radiator 40 that emits sound to the outside. .
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[0023]
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 passive radiator
speaker system according to Embodiment 1 of the present invention.
[0024]
Conventionally, the electrical impedance of a passive radiator 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, as the impedance compensation circuit 30A, the impedance Zc is determined so that the
electrical impedance of the speaker system becomes a constant resistance when the passive
radiator type cabinet 100 is used.
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.
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The impedance compensation circuit 30A is generally represented by FIG. 3 and is represented
by the following equation (1) in mathematical expression.
[0027]
In the above equation (1), the resistances rC1 and rC2 are generally smaller than jωL2, 1 /
(jωC2) and 1 / (jωC3).
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 passive radiator type cabinet 100 to be used, but the condition for completely making the
electrical impedance constant as a speaker system is uniquely determined Be done.
[0029]
When the passive radiator cabinet 100 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 “C0”, electrical
sharpness of dual voice coil speaker unit “Q0”, mechanical sharpness of dual voice coil
speaker unit “Qm”, second voice coil 22 to first voice coil 21 Passive factor seen from the
speaker unit 20, the ratio of force factor “α”, the compliance of air by volume in the passive
radiator type cabinet 100 “Cb”, the equivalent mechanical resistance by volume in the passive
radiator type cabinet 100 “rb” The equivalent mass of the radiator 40 is “mp”, The
equivalent mechanical compliance of the passive radiator 40 seen from the speaker unit 20 is
"Cp", the equivalent mechanical resistance of the passive radiator 40 seen from the speaker unit
20 is "rp", 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, the capacitances
C1, C2 and C3, and the resistances rC1 and rC2 can be obtained from the following formulas (3)
to (10).
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[0030]
However, β, γb, γp, Qb and Qp in the above formulas are as shown in the following formulas
(11) to (15).
[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, the single dual voice coil speaker unit 20 attached to the passive radiator type
cabinet 100 and the dedicated impedance compensation circuit 30A, and can make input
impedance as a speaker system constant resistance.
[0033]
Therefore, the input to the speaker system is constantly supplied constantly, which has the effect
of improving the sound radiation efficiency near the anti-resonance frequency of the passive
radiator speaker system.
[0034]
Second Embodiment
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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
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 a passive radiator, and 200 is a Kelton cabinet.
[0036]
Here, “Kelton type cabinet equipped with a passive radiator” means a passive radiator in which
the rear space of the speaker unit 20 mounted inside is sealed and the space at the front of the
speaker unit 20 radiates sound to the outside 40 is a cabinet 200 of an acoustically coupled
structure.
[0037]
Next, the operation will be described.
The electrical impedance characteristics of a Kelton speaker system with a passive radiator, like
the passive radiator system, produce two peaks around the anti-resonance frequency fr as shown
in FIG.
[0038]
Here, the anti-resonance frequency fr in the Kelton system provided with the passive radiator is
an acoustic resonance frequency determined by the acoustic space at the front of the speaker
unit 20 and the passive pulsator 40.
[0039]
Therefore, this method corresponds to the case where only the first voice coil 21 is used in FIG.
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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
constant resistance is inserted in series in the second voice coil 22.
[0041]
Here, as the impedance compensation circuit 30B, the impedance Zc is determined so that the
electrical impedance of the speaker system becomes a constant resistance when using a Kelton
cabinet 200 having a passive radiator.
[0042]
This impedance compensation circuit 30B is generally represented by FIG. 3 as in the case of the
passive radiator 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, 1 / (jωC2) and 1 / (jωC3).
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.
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[0045]
When a Kelton cabinet 200 equipped with a passive radiator 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 dual voice coil speaker unit Equivalent mechanical
compliance “C0”, electrical sharpness of dual voice coil speaker unit “Q0”, mechanical
sharpness of dual voice coil speaker unit “Qm”, second to first voice coil 21 Force coefficient
ratio of voice coil 22 “α”, equivalent mechanical compliance by speaker unit rear space
“Cb”, equivalent mechanical resistance by air chamber in speaker unit rear space “rb”,
speaker unit front air chamber Equivalent machine compliance "Cf", in front of the speaker unit
From the speaker unit 20, the equivalent mechanical resistance by the air chamber is “rf”, the
equivalent mass of the passive radiator 40 seen from the speaker unit 20 is “mp”, and the
equivalent mechanical compliance of the passive radiator 40 seen from the speaker unit 20 is
“Cp” Assuming that the equivalent mechanical resistance of the passive radiator 40 is “rp”
and the resistance of the first voice coil 21 is “RV1”, the resistance RV2 of the second voice
coil 22 and the inductances L1 and L2 of the compensation circuit element The capacitances C1,
C2, C3 and the resistances rC1, rC2 are obtained from the following equations (16) to (23).
[0046]
However, β, γb, γf, γp, Qb, Qf and Qp in the above formulas are as shown in the following
formulas (24) to (30).
[0047]
As described above, in the speaker system using the dual voice coil speaker unit according to the
second embodiment, one dual voice coil speaker unit mounted on the Kelton cabinet 200
provided with the passive radiator is provided. 20 and a dedicated impedance compensation
circuit 30B, which can make the input impedance of the speaker system constant resistance.
[0048]
Therefore, the input to the speaker system is constantly supplied constantly, and there is an
effect of improving the sound radiation efficiency near the anti-resonance frequency of the
Kelton speaker system provided with the passive radiator.
[0049]
As described above, the speaker system according to the present invention is a dual voice coil
speaker having a passive radiator type cabinet, and first and second voice coils attached to the
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cabinet and to which an input signal is applied. A unit, a passive radiator attached to 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 constantresistance When the inductance which is a circuit element of the impedance compensation circuit
is L1, L2, the capacitances are C1, C2, C3, and the resistances are rC1, rC2, the impedance Zc of
the impedance compensation circuit is expressed by the equation (1) So the input impedance as a
speaker system The resistance can be made constant, and the sound radiation efficiency near the
antiresonance frequency can be improved.
[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 Force coefficient
ratio α, compliance of air by volume in the passive radiator system cabinet Cb, equivalent
mechanical resistance by volume in the passive radiator system cabinet rb, equivalent mass of
the passive radiator viewed from the speaker unit mp, the speaker The equivalent mechanical
compliance of the passive radiator seen from the knit Cp, the equivalent mechanical resistance of
the passive radiator seen from the speaker unit rp, the resistance of the first voice coil RV1, the
resistance of the second voice coil Assuming that .beta. = Mp / m0, .gamma.b = Cb / C0,
.gamma.p = Cp / C0, Qb = .omega.0 m0 / rb, and Qp = .omega.0 m0 / rp as RV2, the resistance
RV2 of the second voice coil and the impedance Since the constants of the circuit elements of the
compensation circuit are expressed by the equations (3) to (10), the input impedance as a
speaker system can be made to be a constant resistance, and the sound radiation efficiency near
the antiresonance frequency is improved It has the effect of being able to
[0051]
As described above, the speaker system according to the present invention includes: a passive
radiator type cabinet; a dual voice coil speaker unit having first and second voice coils attached
to the cabinet and to which an input signal is applied; 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, and the impedance compensation
Assuming that the inductance of the circuit is L1 and L2, and the capacitances are C1, C2 and C3,
the impedance Zc of the impedance compensation circuit is expressed by the equation (2), so the
input impedance as the speaker system is determined. Anti-resonance can be resistance An effect
that it is possible to improve the sound radiation efficiency near the wave number.
08-05-2019
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[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 attached passive radiator; 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 (1) when the inductances L1 and
L2, the capacitances C1, C2 and C3 and the resistances rC1 and rC2 are circuit elements of the
speaker system. The input impedance can be made constant resistance, The effect of being able
to improve the sound radiation efficiency near the antiresonance frequency is exerted.
[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 Ratio of force
factor α, equivalent mechanical compliance by rear space of the dual voice coil speaker unit Cb,
equivalent mechanical resistance by air chamber in rear space of the dual voice coil speaker unit
rb, dual voice coil Equivalent mechanical code by front air chamber of speaker unit From the Cf
of the compliance, rf equivalent mechanical resistance by the front air chamber of the dual voice
coil speaker unit, mp equivalent mass of the passive radiator viewed from the dual voice coil
speaker unit, from the dual voice coil speaker unit The equivalent mechanical compliance of the
passive radiator seen Cp, the equivalent mechanical resistance of the passive radiator seen from
the dual voice coil speaker unit rp, the resistance of the first voice coil RV1, of the second voice
coil Assuming that the resistance is RV2, the condition is β = mp / m0, γb = Cb / C0, γf = Cf /
C0, γp = Cp / C0, Qb = ω0 m0 / rb, Qf = ω0 m0 / rf, Qp = ω0 m0 / rp As the resistance RV2 of
the second voice coil and the constant of each circuit element of the impedance compensation
circuit are expressed by the equations (16) to (23). Since the input impedance of the speaker
system can be made to be a constant resistance, the sound radiation efficiency in the vicinity of
the antiresonance frequency can be improved.
[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 attached passive radiator; and an impedance compensation
circuit interposed between an input terminal to which the input signal is applied and the second
08-05-2019
14
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 represent
inductances of the circuit elements, and C1, C2 and C3 represent capacitances. Around the antiresonance frequency An effect that it is possible to improve the sound radiation efficiency.
[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
the capacitance C1 and the first series circuit, and the resistor rC1 and the capacitance Since the
second series circuit of C2 is composed of the parallel circuit in which the third series circuit of
the resistor rC2, the capacitor C3 and the inductance L2 is connected in parallel, the input
impedance as a speaker system can be made to be a constant resistance Thus, the sound
radiation efficiency near the antiresonant 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 the first series circuit of the inductance L1 and
the capacitance C1 and the first series circuit, and the capacitance C3 and the inductance Since
the capacitor C2 is connected in parallel to the second series circuit of L2, the input impedance
as a speaker system can be made to be a constant resistance, and the sound radiation efficiency
near the antiresonance frequency is improved. It has the effect of being able to
[0057]
Brief description of the drawings
[0058]
FIG. 1 is a diagram showing a configuration of a passive radiator speaker system according to
Embodiment 1 of the present invention.
[0059]
FIG. 2 is a diagram showing an electrical impedance characteristic of the passive radiator speaker
system according to Embodiment 1 of the present invention.
[0060]
FIG. 3 is a diagram showing an impedance compensation circuit of a passive radiator speaker
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system according to Embodiment 1 of the present invention.
[0061]
FIG. 4 is a view showing another impedance compensation circuit of the passive radiator speaker
system according to the first embodiment of the present invention.
[0062]
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 passive radiator speaker system according to Embodiment 1 of the present
invention.
[0063]
FIG. 6 is a diagram showing the configuration of a Kelton speaker system provided with a passive
radiator according to Embodiment 2 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 and 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 passive radiator,
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100 passive radiator system cabinet, 200 Kelton cabinet with passive radiator.
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