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JPH07154892

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DESCRIPTION JPH07154892
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
construction of a composite speaker system.
[0002]
2. Description of the Related Art FIG. 7 shows a configuration of a conventional composite
speaker system disclosed in Japanese Patent Application Laid-Open No. 63-274300, and FIG. 8 is
a main speaker for explaining the operation of the conventional composite speaker system. And
the phase of the amplitude of the auxiliary speaker. In the figure, 1 is a speaker cabinet, 1a is a
first baffle plate constituting the speaker cabinet 1, 1b is a top plate constituting the speaker
cabinet 1, 1c is a bottom plate constituting the speaker cabinet 1, and 1d is the speaker cabinet 1
Back plate 1e is a second baffle plate provided inside the speaker cabinet 1, 2 is a first air
chamber sandwiched between the first baffle plate 1a and the second baffle plate 1e, 3 is a
second Second air chamber sandwiched between baffle plate 1e and back plate 1d, 4 is a main
speaker for emitting sound to the outside, 5 is an auxiliary speaker for canceling back pressure
of the main speaker 4, 6 is a composite speaker system , 6a and 6b are two audio signals 6
divided into two.
[0003]
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1
First, the configuration of each part will be described. A second baffle plate 1e is provided in the
interior of the speaker cabinet 1 including the first baffle plate 1a, the top plate 1b, the bottom
plate 1c, the side plate and the back plate 1d, and the inside of the speaker cabinet 1 is the first
baffle It is divided into a first air chamber 2 sandwiched between the plate 1a and the second
baffle plate 1e, and a second air chamber 3 sandwiched between the second baffle plate 1e and
the back plate 1d. Further, a main speaker 4 for emitting sound to the outside is attached to the
first baffle plate 1a, and an auxiliary speaker 5 for canceling the back pressure of the main
speaker 4 is attached to the second baffle plate 1e.
[0004]
Next, the operation of each part will be described. The audio signal 6 is divided into two, 6a and
6b, and drives the main speaker 4 and the auxiliary speaker 5 in phase. The minimum resonance
frequency f01 of the main speaker 4 itself, the mechanical sharpness Q01, the minimum
resonance frequency f02 when the auxiliary speaker 5 is inserted in the speaker cabinet 1, and
the mechanical sharpness Q02 have the following formulas (1) and (5 As shown in 2), when they
are equal (see the following equation), the amplitude phases of both speakers coincide (see FIG.
8A), and the auxiliary speaker 5 works to cancel the back pressure of the main speaker 4. As a
result, since it becomes equivalent to making the speaker cabinet 1 infinite, the capability of the
main speaker 4 can be extracted to the maximum.
[0006]
f01: Minimum resonance frequency of the main speaker [Hz] m01: Maximum amount of the main
speaker of the main speaker [kg] s01: Equivalent stiffness of the vibration system of the main
speaker [N / m] Q01: Mechanical sharpness of the main speaker r01 : Equivalent resistance of
vibration system of main speaker [N · sec / m] A1: Force coefficient of main speaker [Wb · m]
RV1: DC resistance of voice coil of main speaker [Ω] f02: Lowest resonance frequency of
auxiliary speaker [ Hz] m 02: Equivalent mass of the vibration system of the auxiliary speaker
[kg] s 02: Equivalent stiffness of the vibration system of the auxiliary speaker [N / m] a 2:
Effective vibration radius of the auxiliary speaker [m] Q 02: Mechanical sharpness of the
auxiliary speaker r02: Equivalent resistance of vibration system of auxiliary speaker [N · sec / m]
A2: Force coefficient of auxiliary speaker [Wb · m] ra2: Radiation resistance of auxiliary speaker
[N · sec / m] Rv2: Voice coil of auxiliary speaker of Direct current resistance [Ω] s 2: Equivalent
stiffness of the second air chamber [N / m] 0 0: Density of air (= 1.2) [kg / m 3]
[0007]
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In the conventional composite speaker system, when the equations (1) and (2) do not hold, the
phases of the amplitudes of the main and auxiliary speakers do not match (FIG. 8 (b)) Reference),
can not fully draw out the main speaker's ability.
In order to maximize the capability of the main speaker, it is necessary to properly design the
speaker constants of both speakers so that equations (1) and (2) hold, and there is a problem that
the degree of freedom in design is small. The
[0008]
SUMMARY OF THE INVENTION The present invention has been made to solve the abovementioned problems, and it is an object of the present invention to provide a composite speaker
system having a large degree of freedom in design.
[0009]
SUMMARY OF THE INVENTION According to the present invention, a second baffle plate is
provided in the inside of a speaker cabinet composed of a first baffle plate, a top plate, a bottom
plate, a side plate and a back plate, and the inside of the speaker cabinet is A first air chamber
interposed between the first baffle plate and the second baffle plate and a second air chamber
interposed between the second baffle plate and the back plate, and the first baffle plate In a
composite speaker system in which a main speaker that radiates to the outside and an auxiliary
speaker attached to the second baffle plate for canceling back pressure of the main speaker, a
phase of an audio signal for driving the main speaker in front of the main speaker Is provided
with a phase shifter for changing
[0010]
In addition, a phase shifter for changing the phase of the audio signal for driving the auxiliary
speaker is provided.
[0011]
In addition, a first phase shifter for changing the phase of the audio signal for driving the main
speaker and a second phase shifter for changing the phase of the audio signal for driving the
auxiliary speaker are provided.
[0012]
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A phase shifter for changing the phase of the input audio signal, and a switch for switching the
input audio signal and the output signal of the phase shifter to the main speaker and the
auxiliary speaker for input are provided.
[0013]
In the composite speaker system according to the present invention, by changing the phase of
the audio signal for driving the main speaker or the auxiliary speaker with the phase shifter, the
amplitude of both speakers can be adjusted regardless of the speaker constants of the main
speaker and the auxiliary speaker. Match the phase.
[0014]
Further, by changing the phase of the audio signal for driving the main speaker with the phase
shifter, the phases of the amplitudes of both speakers are made to coincide regardless of the
speaker constants of the main speaker and the auxiliary speaker.
[0015]
Further, by changing the phase of the audio signal for driving the auxiliary speaker by the phase
shifter, the phases of the amplitudes of both speakers are made to coincide regardless of the
speaker constants of the main speaker and the auxiliary speaker.
[0016]
Also, by changing the phase of the audio signal that drives the main speaker with the first phase
shifter and the auxiliary speaker with the second phase shifter, the amplitudes of both speakers
can be adjusted regardless of the speaker constants of both speakers. Match the phase.
[0017]
In addition, both the output signal of the phase shifter and the input audio signal are switched to
the main speaker and the auxiliary speaker by the changeover switch, and the phase of the audio
signal for driving the main speaker or the auxiliary speaker is changed by the phaser. Match the
amplitude phases of both speakers regardless of the speaker constant of the speakers.
[0018]
EXAMPLES Example 1
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4
FIG. 1 is a view showing the configuration of a composite speaker system according to a first
embodiment of the present invention, and FIG. 2 is a view showing amplitude phases of main and
auxiliary speakers of the first embodiment.
In the figure, reference numeral 7 denotes a phase shifter for changing the phase of the audio
signal 6a for driving the main speaker 4.
The other parts are the same as those of the conventional example (see FIG. 7), so the description
will be omitted.
[0019]
Next, the configuration and operation of each part will be described.
A phase shifter 7 is provided at the front stage of the main speaker 4.
Since the speaker constants of the main speaker 4 and the auxiliary speaker 5 are not properly
designed, the equations (1) and (2) do not hold, and the phase of the amplitude of the main
speaker 4 advances with respect to the phase of the amplitude of the auxiliary speaker 5 In the
case (see FIG. 2 (a)), the phase shifter 7 delays the phase of the audio signal 6a driving the main
speaker 4.
On the other hand, the auxiliary speaker 5 is driven as it is by the audio signal 6b.
As a result, the phase of the amplitude of the main speaker 4 is delayed, and the phases of the
amplitudes of the two speakers coincide with each other (see FIG. 2 (b)), so that the capability of
the main speaker 4 can be maximized.
[0020]
According to the first embodiment, since the phases of the amplitudes of the two speakers
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coincide with each other regardless of the speaker constants of the main and auxiliary speakers,
the degree of freedom in design is increased.
[0021]
Example 2
FIG. 3 is a view showing the configuration of a composite speaker system according to a second
embodiment of the present invention, and FIG. 4 is a view showing amplitude phases of the main
and auxiliary speakers of the second embodiment.
In the figure, reference numeral 8 denotes a phase shifter for changing the phase of the audio
signal 6b for driving the auxiliary speaker 5.
The other parts are the same as those of the conventional example (see FIG. 7), so the description
will be omitted.
[0022]
Next, the configuration and operation of each part will be described.
A phase shifter 8 is provided at the front stage of the auxiliary speaker 5. Since the speaker
constants of the main speaker 4 and the auxiliary speaker 5 are not properly designed, equations
(1) and (2) do not hold, and the phase of the amplitude of the auxiliary speaker 5 advances with
respect to the phase of the amplitude of the main speaker 4 In the case (see FIG. 4 (a)), the phase
shifter 8 delays the phase of the audio signal 6b driving the auxiliary speaker 5. On the other
hand, the main speaker 4 is driven as it is by the audio signal 6a. As a result, the phase of the
amplitude of the auxiliary speaker 5 is delayed, and the phases of the amplitudes of the two
speakers coincide with each other (see FIG. 4B), so that the capability of the main speaker 4 can
be maximized.
[0023]
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According to the second embodiment, since the phases of the amplitudes of the two speakers
coincide with each other regardless of the speaker constants of the main and auxiliary speakers,
the degree of freedom in design is increased.
[0024]
Example 3
FIG. 5 is a view showing the configuration of a composite speaker system according to a third
embodiment of the present invention. In the figure, 7 is a first phase shifter that changes the
phase of the audio signal 6a that drives the main speaker 4, and 8 is a second phase shifter that
changes the phase of the audio signal 6b that drives the auxiliary speaker 5. . The other parts are
the same as those of the conventional example (see FIG. 7), so the description will be omitted.
[0025]
First, the configuration of each part will be described. In Example 1 and Example 2, since the
phase shifter 7 or 8 is provided in the front | former stage of the main speaker 4 or the auxiliary
speaker 5, versatility is low. On the other hand, in the third embodiment, since the first phase
shifter 7 is provided at the front stage of the main speaker 4 and the second phase shifter 8 is
provided at the front stage of the auxiliary speaker 5, the above problem is eliminated. Not only
will the versatility be improved.
[0026]
Next, the operation of each part will be described. Since the speaker constants of the main
speaker 4 and the auxiliary speaker 5 are not properly designed, the equations (1) and (2) do not
hold, and the phase of the amplitude of the main speaker 4 advances with respect to the phase of
the amplitude of the auxiliary speaker 5 In the case (see FIG. 2A), the first phase shifter 7 delays
the phase of the audio signal 6a driving the main speaker 4. On the other hand, the auxiliary
speaker 5 is driven as it is by the audio signal 6b. As a result, the phase of the amplitude of the
main speaker 4 is delayed, and the phases of the amplitudes of the two speakers coincide with
each other (see FIG. 2 (b)), so that the capability of the main speaker 4 can be maximized.
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[0027]
Similarly, when the phase of the amplitude of the auxiliary speaker 5 advances with respect to
the phase of the amplitude of the main speaker 4 (see FIG. 4A), the second phase shifter 8
generates an audio signal 6 b for driving the auxiliary speaker 5. Delay the phase. On the other
hand, the main speaker 4 is driven as it is by the audio signal 6a. As a result, since the phase of
the amplitude of the auxiliary speaker 5 is delayed and the phases of the amplitudes of the two
speakers coincide with each other (see FIG. 4B), it is possible to maximize the ability of the main
speaker 4.
[0028]
According to the third embodiment, since the phases of the amplitudes of the two speakers
coincide with each other regardless of the speaker constants of the main and auxiliary speakers,
the degree of freedom in design is further increased.
[0029]
Example 4
FIG. 6 is a view showing the configuration of a composite speaker system according to a fourth
embodiment of the present invention. In the figure, 7 is a phase shifter for changing the phase of
the input audio signal, 9 is an output signal of the phase shifter 7 switched to the main speaker 4
side and the auxiliary speaker 5 at the same time as the input audio signal is It is a changeover
switch for switching to the speaker side. The other parts are the same as those of the
conventional example (see FIG. 7), so the description will be omitted.
[0030]
First, the configuration of each part will be described. In the third embodiment, two phase
shifters are used, which is costly. On the other hand, in the fourth embodiment, the number of
phase shifters is one, and the switch 9 switches the output signal and the input audio signal of
the phase shifter 7 to the main speaker 4 side and the auxiliary speaker 5 side. Not only
eliminate costs but also reduce costs.
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[0031]
Next, the operation of each part will be described. Since the speaker constants of the main
speaker 4 and the auxiliary speaker 5 are not properly designed, the equations (1) and (2) do not
hold, and the phase of the amplitude of the main speaker 4 advances with respect to the phase of
the amplitude of the auxiliary speaker 5 In the case (see FIG. 2A), the changeover switch 9 is
switched to the A side, and the output signal of the phase shifter 7 is input to the main speaker 4
side. The phase shifter 7 delays the phase of the audio signal 6 a driving the main speaker 4. On
the other hand, the auxiliary speaker 5 is driven as it is by the audio signal 6b. As a result, the
phase of the amplitude of the main speaker 4 is delayed, and the phases of the amplitudes of the
two speakers coincide with each other (see FIG. 2 (b)), so that the capability of the main speaker
4 can be maximized.
[0032]
Similarly, when the phase of the amplitude of the auxiliary speaker 5 advances with respect to
the phase of the amplitude of the main speaker 4 (see FIG. 4A), the changeover switch 9 is
switched to the B side to assist the output signal of the phase shifter 7 Input to the speaker 5
side. The phase shifter 7 delays the phase of the audio signal 6 a that drives the auxiliary speaker
5. On the other hand, the main speaker 4 is driven as it is by the audio signal 6b. As a result,
since the phase of the amplitude of the auxiliary speaker 5 is delayed and the phases of the
amplitudes of the two speakers coincide with each other (see FIG. 4B), it is possible to maximize
the capability of the main speaker 4.
[0033]
According to the fourth embodiment, since the phases of the amplitudes of the two speakers
coincide with each other regardless of the speaker constants of the main and auxiliary speakers,
the degree of freedom in design is increased.
[0034]
Example 5
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9
In the first to fourth embodiments, the speaker constants of the main speaker and the auxiliary
speaker are not properly designed, and therefore, the case where the amplitude phases of both
speakers do not match is described. It is sufficient to provide a means for changing. For example,
when the magnitudes of the amplitudes of the two speakers do not match, means for changing
the magnitude of the amplitude may be provided to match the magnitudes of the amplitudes of
the two speakers.
[0035]
As described above, according to the present invention, the phase of the amplitude of both
speakers is the same phase by changing the phase of the audio signal for driving at least one of
the main speaker and the auxiliary speaker by the phase shifter. Since the phase of the amplitude
of both speakers can be matched regardless of the speaker constants of the main and auxiliary
speakers, the capability of the main speaker can be maximized and the degree of freedom in
design is increased. .
[0036]
Further, since the phase of the audio signal for driving the main speaker is changed by the phase
shifter, the phases of the amplitudes of both speakers can be matched regardless of the speaker
constants of the main speaker and the auxiliary speaker.
[0037]
Further, since the phase of the audio signal for driving the auxiliary speaker is changed by the
phase shifter, the amplitude phases of both speakers can be matched regardless of the speaker
constants of the main speaker and the auxiliary speaker.
[0038]
In addition, since the phase of the audio signal for driving the main speaker and the auxiliary
speaker is changed by the first phase shifter and the second phase shifter, the amplitude phase of
both speakers regardless of the speaker constant of both speakers Can be matched.
[0039]
In addition, since the output switch of the phase shifter and the input audio signal are switched
to the main speaker side and the auxiliary speaker side by the changeover switch, and the phase
of the audio signal for driving the main speaker or the auxiliary speaker is changed. The
amplitude phase of both speakers can be matched regardless of the speaker constant of.
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