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JPS61161895

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DESCRIPTION JPS61161895
[0001]
FIELD OF THE INVENTION The present invention relates to a speaker system using a unit having
two voice coils wound around the same bobbin. In general, as shown in FIG. 4, a speaker system
is composed of input terminals 1 and 2, speaker unit 3, voice coil / I / 4 and voice coil / L / 4
terminals 6 and 7 and has sound pressure frequency characteristics and impedance frequency
The characteristics are shown in FIG. 2 curve and FIG. 3 curve, respectively. Based on such a
general speaker system, in recent years, in order to increase the sound pressure in the low
frequency range, a device in which a voice coil is devised is devised. An example of the prior art
will be described below with reference to the drawings. FIG. 5 shows an example of the prior art.
In FIG. 6, 1 and 2 are input terminals, 13 is a speaker unit in which a voice coil 1v15 for
enhancing bass is added to the voice coil 14 of a general speaker unit, and the voice signal / 14
is directly connected to the terminals 1 and 2. The positive terminal 18 of the voice coil 16 is
connected via a series resonant circuit consisting of the input terminal 1, the inductor L, and the
capacitor G1. The resonant frequency of the series resonant circuit is matched to the lowest
resonant frequency foc when the speaker unit 13 is attached to the cabinet. Curve C2 of FIG. 2
Curve C of FIG. 3 is a sound pressure frequency characteristic diagram and an impedance
frequency characteristic diagram of the speaker system in the above-mentioned configuration,
respectively. Minimum resonance frequency f in the above configuration. Outside the vicinity of
a, the impedance of the series resonant circuit is extremely high. A signal current hardly flows
through the voice coil 16, and the speaker unit 13 is driven only by the voice coil / l / 14. Lowest
resonance frequency f. . In the vicinity, the impedance of the series resonant circuit is lowered,
and a signal current also flows through the voice coil 15. Therefore, the impedance seen from the
input terminal is as shown by curve C in FIG. 3, and the sound pressure frequency characteristic
is as shown by curve C in FIG. Curve d of FIG. Curve d in FIG. 3 shows the sound pressure
frequency characteristics and the impedance when the speaker unit 13 is driven only by the
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voice car A / 14 by disconnecting the route from the input terminal 1 to the plus terminal of the
voice car I / 15 in the above configuration. It is a frequency characteristic figure. As is apparent
from FIG. 2, the lowest resonance frequency f in the above configuration. . In the vicinity, since
the speaker unit 13 is driven by both of the voice coils 14 and 16, the sound pressure is higher
than when driven by only the voice coil / I / 14.
Problems to be solved by the invention As described above, although the sound pressure in the
vicinity of the lowest resonance frequency f0 ° can be increased in the above-described prior
art, the voice coil is contained to realize the above configuration. The gap size of the magnetic
circuit needs to be designed as wide as the voice coil / l / 16, so that the magnetic flux density in
the gap is reduced and the driving force is reduced. Furthermore, in the above configuration, the
voice coil / L / 115 is the lowest resonance frequency f. . The sound pressure is lower than at the
time of using the speaker unit having only the voice cary / L / 14 because it is not used at all at
frequencies other than the vicinity. Thus, the lowest resonance frequency f in the conventional
method. Although the sound pressure level can be increased in the vicinity of a, the sound
pressure level μ is rather lowered at frequencies other than the vicinity of the lowest resonance
frequency f0 °. In view of the above problems, the present invention is the lowest resonance
frequency f without lowering the sound pressure level even at frequencies other than the vicinity
of the lowest resonance frequency f0 °. . A speaker system that can increase the sound pressure
level in the vicinity is provided. Means for Solving the Problems In order to solve the above
problems, the present invention comprises a unit having two voice coils wound around the same
bobbin, and a first input terminal to which an input signal is supplied The second input terminal
is connected to the plus terminal of the first voice coil of the unit and the minus terminal of the
second voice coil, and the negative terminal of the first voice coil and the second voice coil A
series resonant circuit in which a lath terminal is connected via a parallel resonant circuit
including at least an inductor and a capacitor, and the first input terminal and a positive terminal
of the second voice coil p including at least an inductor and a capacitor , And the series resonant
circuit consisting of at least an inductor and a capacitor between the second input terminal and
the negative terminal of the first voice coil. It is due to connection configuration through. Effect
of the Invention According to the present invention, with the above-described configuration, the
lowest resonance frequency f without lowering the sound pressure level even at frequencies
other than the vicinity of the lowest resonance frequency foa. . The sound pressure level in the
vicinity can be raised. Embodiment An embodiment of the present invention will be described
with reference to the drawings. FIG. 1 is a block diagram of a speaker system according to the
present invention, and curve C2 of FIG. 2 is a curve a of FIG. 3 is a sound pressure frequency
characteristic diagram and an impedance frequency characteristic diagram of the speaker
system, respectively.
In FIG. 1, the input terminal 1 is connected to the first poscoy / l / 24 plus terminal 26 of the
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speaker unit 23, and the input terminal 2 is the minus terminal 29 of the second pois cari / L '25
of the speaker unit 23. And connected. In addition, an inductor L 2 ° capacitor C 2 is connected
in parallel between the minus terminal 27 of the first pois car / L / 24 of the speaker unit 23 and
the plus terminal 28 of the second pois car / L '25 of the speaker unit 23 A resonant circuit is
connected. Furthermore, an inductor L4 is provided between the input terminal 1 and the plus
terminal 28 of the second pois cary / L '25 of the speaker unit 23, and between the input
terminal 2 and the minus terminal 27 of the first pois cary / L / 24 of the speaker unit 23. . A
series resonant circuit composed of a capacitor C4 is connected. されている。 In the above
configuration, the series resonance circuit between the terminals 26-28 and between the
terminals 27-29 exhibits extremely high impedance and the parallel resonance circuit between
the terminals 27-28 is extremely low except for the vicinity of the lowest resonance frequency
'oo of the input signal. Indicates the impedance. Therefore, at the above frequency, the first pois
car 1 v 24 of the speaker unit 23 and the second pois car 1 v 25 of the speaker unit 23 are
connected in series. When the input signal is near the lowest resonance frequency f0 °, the
series resonant circuit between the terminals 26-28 and between the terminals 27-29 exhibits a
very low impedance, and the parallel resonant circuit between the terminals 27-28 exhibits a
very high impedance. Therefore, at the above-mentioned frequency, the first pois car A / 24 of
the speaker unit 23 and the second pois car / L / 25 of the speaker unit 23 are connected in
parallel. Now, the DC resistance of the first pois cari v24 of the speaker unit 23 and the second
pois cari / L / 25 is r0 / 2 + dynamic impedance is Zd, the force coefficient is Bl, and the output
voltage of the amplifier to be connected is X Then, the input signal is the lowest resonance
frequency f. The sound pressure level / I / P (f ') at other than near c is p (f)-B1-1c / (ro + Zjf)),
and at the lowest resonance frequency fac, P (f) = B1 · 冨 / Cr 冨 4 + Zd (Foa)). (F is frequency) On
the other hand, it has one in which the first pois cary / L / 24 and the second pois cary / 1/25 of
the speaker unit 23 of FIG. Consider a general speaker unit that is identical to the speaker unit
23.
The direct current resistance of this speaker unit is r. It is obvious that the dynamic impedance is
zd and the force coefficient is B1. The sound pressure level yP '(f) of the speaker system using
this speaker unit is P' (fl-Bl * H / (ro + Za (f)) at all frequencies. Therefore, comparing the sound
pressure level p of the speaker system according to the present invention with the speaker
system according to the present invention, the two are completely identical except in the vicinity
of the lowest resonance frequency f0 °, and the lowest resonance frequency f. . It can be seen
that in the vicinity, p> p '. In the embodiment, the parallel resonant circuit and the series resonant
circuit are configured by only the inductor and the capacitor. However, it is needless to say that a
part of each resonant circuit may include a resistor. As described in detail in the invention,
according to the present invention, since the Poissroom of the speaker unit can be effectively
used over all frequencies, the lowest resonance frequency f as compared with the conventional
speaker system. . The lowest resonant frequency f without any decrease in sound pressure level
at frequencies other than near. . Sound pressure can be increased in the vicinity.
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[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of a speaker system according to an embodiment of the present
invention, and FIGS. 2a, 2b and 2c are respectively a speaker system according to an
embodiment of the present invention, a general speaker system, and a speaker system according
to a conventional example. FIG. 4 is a block diagram of a general speaker system, and FIG. 6 is a
block diagram of a conventional speaker system.
1.2 ...... input terminal, 23 ... ... speaker unit, 24 ...... first voice coil, 25 ...... second voice coil, 26,
27, 28. 29 ..... Speaker unit input terminal. Name of Agent Attorney Nakao Toshio and 1 other
person Figure 4 Figure 5 Procedure correction book (method) June 20, 1960
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