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JP2006174077

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DESCRIPTION JP2006174077
PROBLEM TO BE SOLVED: To improve reproduction characteristics of a small volume signal from
a speaker. SOLUTION: The small signal speaker unit 32 for outputting a signal of a
predetermined level or less of an input audio signal is a characteristic in which the linearity of
the output frequency with respect to the input signal is substantially ensured in a range of a
predetermined level or less; This is a characteristic in which the linearity of the output frequency
with respect to the input signal is substantially ensured in the range, and a speaker unit 31 for
large signal that outputs a signal of a predetermined level or more of the input audio signal
Ensure linearity of input / output characteristics for both signals. [Selected figure] Figure 2
Speaker device
[0001]
The present invention relates to a speaker device that reproduces an audio signal, and more
particularly to a technology that is suitably applied to a speaker device for high fidelity
reproduction capable of reproducing high-quality sound.
[0002]
Conventionally, various configurations have been put to practical use as speaker devices for high
fidelity reproduction capable of high-quality sound reproduction.
For example, there is a three-way speaker device in which a reproduction band of an audio signal
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is divided into three bands of low, middle, and high bands, and separate speaker units are
prepared for each band. This 3-way speaker device can reproduce the input audio signal
faithfully from the low band to the high band by using a speaker unit for each band that has
good reproduction characteristics in each band. Generally, the reproduction characteristic is
better than that of a so-called full range type speaker unit in which audio of all bands is output
by one speaker unit.
[0003]
In addition to the above-described three-way configuration and two-way configuration, in
addition to the configuration for enhancing the reproduced sound of the speaker device, the
amplifier device side corrects the characteristics of the audio signal itself supplied to the speaker
device. As a result, it is also performed to improve the characteristics of the audio output from
the speaker device. For example, an audio amplifier device that performs processing such as
amplification of an audio signal that drives a speaker device may perform correction called
loudness control. This loudness control performs correction processing that enhances the output
level compared to the midrange part with the bass part and the trebleband part, and corrects that
the low band and the high band are heard mainly when the volume is small. It is a thing.
[0004]
Patent Document 1 describes an example of a reproduction configuration when loudness
correction is performed. JP 2002-171589 A
[0005]
However, since the loudness-controlled playback sound simply boosts the signal of a specific
frequency band almost uniformly regardless of the level, it is not strictly a reproduction that is
faithful to the input audio signal, but rather the input audio. It has been desired to develop a
speaker device capable of faithful reproduction to a signal. That is, since the conventional
loudness-controlled reproduction sound is reproduced by enhancing the sound which is hard to
hear when the volume is small, the bass and treble parts become easier to hear compared to the
reproduction sound without the loudness control, and the sound quality to some extent However,
since the signal in a specific frequency band is uniformly enhanced, signal components that do
not need to be enhanced may also be enhanced, resulting in unnatural reproduced sound. There
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are times when
[0006]
Here, to explain the problem of the reproduced sound in the conventional speaker device, there
is a problem of a small amplitude signal as an example in the case where the reproduced sound
does not faithfully reproduce the input audio signal. That is, for example, as shown in FIG. 10A, it
is assumed that an input audio signal S1 having a waveform in which a waveform having a
relatively large amplitude and a waveform having a relatively small amplitude are continuous is
input to the speaker. At this time, the waveform of the output audio signal S2 from the speaker is
substantially the same as the input signal S1 for the waveform of relatively large amplitude, but
the amplitude of the waveform of relatively small amplitude is higher than that of the input
signal S1. It tends to be smaller. This is because a speaker unit having a general diaphragm
capable of outputting a relatively loud sound has poor reproduction characteristics of a small
volume signal with a small amplitude, and the linearity of the input / output characteristics of the
small volume signal ( Linearity) is not ensured.
[0007]
Similarly, for example, as shown in FIG. 10 (b), the input audio signal S3 having a relatively large
amplitude waveform and the input audio signal S4 having a relatively small amplitude waveform
overlap in time, so that, in principle, The audio signal S5 obtained by combining the two signals
S3 and S4 is output, but the output audio signal S6 having a waveform whose level is lower than
the waveform of the combined signal S5 is output from the speaker. For example, when the
sounds of various instruments are simultaneously reproduced as the audio to be reproduced
from the speaker, such as symphony, such an output state may occur.
[0008]
Further, for example, as shown in FIG. 10C, when there is an impulse signal in which the
amplitude of the signal of a specific single frequency gradually decreases as the input audio
signal S7, the waveform of the output audio signal S8 from the speaker Also, as the level
decreases, the followability deteriorates.
[0009]
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In any of the examples shown in FIG. 10, as the output from the speaker, the output level of the
small volume signal with small amplitude is smaller than the input signal level, and the linearity
of the small signal is not maintained.
When frequency analysis is performed on the state shown in FIG. 10, for example, the state
shown in FIG. 11 is obtained. The example of FIG. 11 is an example in which the sensitivities of
the fundamental wave f1 and the harmonics f2 and f3 that are harmonics of the fundamental
wave are analyzed. The fundamental wave f1 with a high level is output as it is, but the
harmonics f2 and f3 whose levels are smaller than the fundamental wave have output
sensitivities shown by a solid line that is lower than the original level shown by a broken line. ing.
[0010]
FIG. 12 is a graph showing the output characteristics from low to high frequencies at multiple
levels of signal levels, where FIG. 12 (a) is an ideal characteristic, and FIG. 12 (b) is an actual
speaker output It is the figure which showed the characteristic. As shown in FIG. 12A, in an ideal
state, it is assumed that the four levels L1, L2, L3, and L4 have flat characteristics from low to
high regions at substantially equal intervals. At this time, as the actual output characteristics of
the speaker shown in FIG. 12 (b), for the levels L1, L2 and L3 having high output levels,
substantially the same output characteristics as the ideal characteristics can be secured, but the
lowest level The characteristic of L4 is a level which is lowered in any frequency band by the
sensitivity α from the originally necessary level.
[0011]
It is an input / output characteristic diagram of FIG. 13 that such a decrease in sensitivity is seen
as a characteristic of a specific frequency. As shown in FIG. 13, the characteristic x of the broken
line in which the output level increases linearly with the increase of the input signal level to the
speaker has to be originally required, but in fact it is more than a certain level In this case, the
level changes almost linearly, but below a specific level, the movement of the diaphragm with
respect to the input is bad, and the output sensitivity to the input has a characteristic y of a curve
that is very bad.
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[0012]
Specifically, for example, assuming that the maximum level of listening by a general speaker is
70 to 100 spl (sound pressure level), a signal which is -30 dB to -60 dB lower than the maximum
level is correct for the maximum level- It means that the volume lowered by 30 dB to -60 dB is
not output (not proportional). Assuming that the volume of the output of the amplifier device is
reduced by 50 spl from 100 spl, the volume at around 50 spl should be obtained originally, but
in practice only 40 spl whose output is 10 spl lower is actually obtained, for example. It will not
be possible. That is, it means that linearity can not be accurately obtained, and it has been found
by analysis of the present inventor that it is one of the major causes for not obtaining satisfactory
sound quality.
[0013]
Note that the characteristics described so far are the characteristics in the case where the
diaphragm is a relatively large speaker unit capable of relatively large volume output, but
conversely, for example, as in the case of a speaker unit for headphones, small volume In the case
of a small and lightweight speaker unit manufactured for the output of the above, the linearity of
the input and output can be kept relatively good at the time of small volume and the linearity of
the input and output characteristics at the time of large volume can not be maintained. There is
also a configuration.
[0014]
The present invention has been made in view of the foregoing, and it is an object of the present
invention to improve the reproduction characteristics of a small volume signal from a speaker.
[0015]
According to the present invention, in a speaker device driven by an input audio signal, a signal
having a predetermined level or less of the input audio signal is output with a characteristic that
the linearity of the output with respect to the input signal is substantially ensured in the range
below the predetermined level. A speaker unit for signal, and a large-signal speaker unit for
outputting a signal of a predetermined level or more of an input audio signal with a characteristic
that linearity of output with respect to the input signal is substantially ensured in a range of a
predetermined level or more; It is
[0016]
In this way, the speaker device is at least two speaker units mainly composed of a small signal
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speaker unit suitable for small amplitude signal vibration and a large signal speaker unit mainly
suitable for large amplitude signal vibration. Will be configured.
[0017]
According to the present invention, the speaker apparatus is configured by at least two speaker
units mainly composed of the small signal speaker unit suitable for the small amplitude signal
vibration and the large signal speaker unit mainly suitable for the large amplitude signal
vibration. The input and output characteristics of the signal of any level from the small signal to
the large signal can be fixed by using the characteristic that the linearity is substantially secured
within the level range of the signal that each speaker unit handles. Output and can dramatically
improve the playback sound quality.
In particular, the reproduction characteristics of small level signals are improved.
[0018]
In this case, the small signal speaker unit is provided with a suppression mechanism that
suppresses vibration of the diaphragm due to a signal of a predetermined level or more, so that
the suppression mechanism automatically suppresses large amplitude vibration due to a signal of
the predetermined level or more. As a result, only a signal of a predetermined level or less is
output, and effectively functions as a small signal speaker unit.
[0019]
Also, the input audio signal is frequency-divided into signals of a plurality of frequency bands,
and a speaker unit is prepared for each of the frequency-divided bands, and a speaker unit for
outputting a signal of at least one band is a predetermined level or less By providing a small
signal speaker unit for outputting a signal and a large signal speaker unit for outputting a signal
of a predetermined level or more, small individual speaker units for each frequency band can be
provided. It is possible to improve the linearity from signal to large signal.
[0020]
Furthermore, in the case of preparing a speaker unit for each frequency-divided band in this way,
the frequency-divided band is divided into three bands of low, middle and high, and one highpass speaker By outputting the signal from the unit and dividing it into the small signal speaker
unit and the large signal speaker unit for the low band and the mid band, respectively, from small
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to large signals with only one speaker unit A speaker apparatus having a multi-way configuration
can be obtained, in which the band with relatively poor linearity is effectively improved.
[0021]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
1 to 7.
FIG. 1 is a diagram showing an example of a system configuration according to the present
embodiment.
The present embodiment is a speaker device connected to an audio reproduction system, and
FIG. 1 is a diagram showing an example of the entire system configuration.
In this example, the audio signal source 10 is connected to the amplifier device 20, and the audio
signal source 10 reproduces an audio signal recorded (stored) in a medium such as a CD (disc) or
memory, and reproduces the audio signal. The audio signal to be output is supplied to the
amplifier device 20, and the amplifier device 20 performs processing to convert the audio signal
into an audio signal for driving the speaker device.
[0022]
In the case of this example, the audio signal output from the audio signal source 10 is a twochannel signal of an audio signal for the left channel and an audio signal for the right channel.
The left channel audio signal output from the amplifier device 20 is supplied to the left channel
speaker device 30L for output, and the right channel audio signal is supplied to the right channel
speaker device 30R for output.
[0023]
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The left channel speaker device 30L and the right channel speaker device 30R basically have the
same configuration (however, the outer shape may be left-right symmetric).
In the following description, the left and right channel speaker devices 30L and 30R may be
referred to as the speaker device 30 with the symbol excluding L and R, when the channels are
distinguished and described.
The same applies to each component in the speaker device 30.
[0024]
The left channel speaker device 30L includes a large signal speaker unit 31L and a small signal
speaker unit 32L as a speaker unit as sound output means for outputting audio. The right
channel speaker device 30R includes a large signal speaker unit 31R and a small signal speaker
unit 32R as a speaker unit as sound output means for outputting audio. Each of the speaker units
31L, 31R, 32L, and 32R has a characteristic that is substantially flat in the audible band as a
characteristic viewed from the output frequency band, and has a characteristic of being output
from low to high It is a full-french type speaker unit. However, the large signal speaker units 31L
and 31R are large speaker units provided with relatively large diaphragms, and the small signal
speaker units 32L and 32R are small speakers provided with relatively small diaphragms.
Become a unit.
[0025]
Specific examples of characteristics of each speaker unit will be described later, but in the case of
a large signal speaker unit, since the diaphragm is relatively large, the linearity (linearity) of the
input and output characteristics of large signals above a predetermined level is approximately
For small signal speaker units, those that can maintain the linearity of the input / output
characteristics of small signals below a predetermined level because the diaphragm is relatively
small are used. It is used.
[0026]
As described above, each of the speaker devices 30L and 30R includes two speaker units, the
large signal speaker units 31L and 31R and the small signal speaker units 32L and 32R, so that
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audio signals are output from the respective speaker devices 30L and 30R. When the signal level
is large, the large-amplitude signals are output from the large signal speaker units 31L and 31R,
and the small-amplitude signals are output from the small signal speaker units 32L and 32R. Will
be
The levels output from the two speaker units are separated at a predetermined level set in
advance. However, the signal level to be output strictly is not divided at the boundary of the
predetermined level, for example, even in the vicinity of the predetermined level, the sounds
output from the two speaker units overlap to some extent. Good.
[0027]
FIG. 2 is a diagram showing a connection configuration of two speaker units 31 and 32 in the
speaker device 30. As shown in FIG. An audio signal is supplied from the amplifier device 20 to
the input terminal 33, and the audio signal obtained at the input terminal 33 is supplied to the
small amplitude suppression circuit 34 and the large amplitude suppression circuit 35. The small
amplitude suppression circuit 34 attenuates small amplitude components below a predetermined
level in the input audio signal, and the large amplitude suppression circuit 35 attenuates large
amplitude components above the predetermined level in the input audio signal.
[0028]
The small amplitude suppression circuit 34 and the large amplitude suppression circuit 35 may
be configured as an analog circuit configured of an active element or the like, but may be
configured as a digital circuit using a digital filter or the like. However, in the case of the digital
circuit configuration, it is preferable to input a signal that is not amplified for driving the speaker
as an input audio signal, and to amplify the output of the amplitude suppression circuit for
driving the speaker in the speaker device. Even in the case of an analog circuit, amplification may
be similarly performed in the speaker device.
[0029]
The audio signal in which the small amplitude signal is suppressed (removed) by the small
amplitude suppression circuit 34 is supplied to the large signal speaker unit 31 to be output
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(sound emission). The audio signal whose large amplitude signal is suppressed (removed) by the
large amplitude suppression circuit 35 is supplied to the small signal speaker unit 32 and output
(sound output).
[0030]
FIG. 3 is a diagram showing an example of the configuration when the small amplitude
suppression circuit 34 is configured by an analog circuit. The input terminal 33a of one polarity
is connected to one end of the voice coil 32a of the speaker unit 32 through the resistor 35a, and
the other end of the voice coil 32a is connected to the input terminal 33b of the other polarity.
Furthermore, a resistor 35b is connected in parallel with the voice coil 32a. The resistors 35 a
and 35 b are elements functioning as the small amplitude suppression circuit 34. The selection of
the resistance values of the resistors 35a and 35b sets the level at which the small amplitude
signal is suppressed (removed).
[0031]
FIG. 4A is a cross-sectional view showing a part of the magnetic circuit of the speaker unit 32 in
an example in which the large amplitude suppression circuit 35 is integrally formed with the
small signal speaker unit 32. As shown in FIG. In this example, a predetermined magnetic circuit
101 is configured in a small signal speaker unit 32 configured as a dynamic speaker unit, and a
voice wound around a coil bobbin to which a diaphragm (not shown) is connected. The coil 104
is arranged in the gap 102 of the magnetic circuit 101. With such a configuration, the voice coil
104 itself is vibrated by the audio signal flowing to the voice coil 104, the connected diaphragm
is vibrated, and sound is output.
[0032]
Here, in this example, the winding width of the voice coil 104 wound around the coil bobbin is
configured to be narrower than the width g of the gap 102. With this configuration, as shown in
FIG. 4B, when the voice coil 104 moves away from the width g of the gap 102, a force is exerted
to pull back the voice coil 104 to the gap 102 side. It will be. Therefore, the vibration width of
the diaphragm connected to the voice coil 104 is substantially regulated by the width of the gap
102, and even if an audio signal with a large amplitude is input, this speaker unit for small
signals is consequently obtained. The output from 32 is only the output suppressed to a small
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amplitude determined by the width of the gap 102.
[0033]
When the gap width and the winding width of the voice coil are reduced to a small amplitude as
shown in FIG. 4, for example, as shown in FIG. By arranging 106, each voice coil 104 may be
configured to generate a magnetic field in a direction opposite to the magnetic field generated in
the magnetic circuit 101 in the gap 102. With such a configuration, when the voice coil 104
moves (vibrates) so as to be out of the gap 102, the voice coil 104 is pulled back to the gap 102
by the magnetic field generated by the magnetic plate 105 or 106 adjacent to the gap 102. As a
result, the vibration width of the diaphragm is suppressed to a small amplitude more reliably
than in the configuration of FIG.
[0034]
An example of the input / output characteristics of the audio signal of the speaker device 30
including the large signal speaker unit 31 and the small signal speaker unit 32 as described
above is as shown in FIG. Although FIG. 6 shows the measurement of input / output
characteristics at a specific frequency, basically, the same characteristics are substantially the
same at any frequency in the output band of the speaker units 31 and 32. As shown in FIG. 6, as
the output characteristic S12 of the small signal speaker unit 32, a signal having a level lower
than the predetermined level V1 is output, and there is almost no output of a level higher than
the predetermined level V1. The output characteristic S11 of the large signal speaker unit 31 is
an input / output characteristic substantially similar to the ideal input / output characteristic x at
a level higher than the predetermined level V1, and there is almost no output at a level lower
than the predetermined level V1.
[0035]
In this case, since the small signal speaker unit 32 has a configuration suitable for small level
output, the input / output characteristic at a level lower than the predetermined level V1 is
substantially similar to the ideal input / output characteristic x. The large-signal speaker unit 31
has a characteristic suitable for large-level output, so that the input / output characteristic at a
level higher than the predetermined level V1 is substantially similar to the ideal input / output
characteristic x. It becomes a characteristic.
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[0036]
Therefore, as a total characteristic of the speaker apparatus combining the two speaker units 31
and 32 for the large signal and the small signal, the relationship between the input and the
output is linear from the small level signal to the large level signal. The output characteristics are
substantially equal to the ideal input / output characteristic x which changes to the above,
resulting in good output characteristics in which the linearity of the input and output is
maintained from a small level signal to a large level signal.
The characteristic that the linearity of the input and output is maintained from such a small level
signal to a large level signal is realized when one speaker unit outputs a small level signal to a
large level signal. In the case of this example, good characteristics are secured. As an output
characteristic of the speaker device of this example, a characteristic close to the ideal
characteristic of FIG. 12A referred to in the description of the background art is obtained.
[0037]
The two speaker units 31 and 32 for the large signal and the small signal may be arranged side
by side or the like in one speaker box constituting the speaker device 30, but the two speakers
may be arranged. When the units 31 and 32 are disposed as close as possible, the positions of
the sound sources from which the sound is output from the speaker device are integrated into
one, which is more preferable as a speaker.
[0038]
For example, as shown in FIG. 7, a speaker device 30 'may be provided in which the large signal
speaker unit 31 and the small signal speaker unit 32 are coaxially arranged.
In this case, for example, the small signal speaker unit 32 may be disposed in front of the large
signal speaker unit 31 so that the positions of the diaphragms of both speaker units do not
interfere with each other.
[0039]
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12
Alternatively, for example, in the case of a speaker device for an audio system arranged in a
vehicle such as a car, the large signal speaker unit 31 and the small signal speaker unit 32 may
be arranged at different positions. . For example, a relatively small speaker unit 32 for small
signals is disposed in the vicinity of a listener (driver) such as a mirror cell, a pillar, or a
dashboard in a vehicle, and the speaker unit 31 for a relatively large large signal is It may be
arranged in a place where an installation space such as a door can be secured.
[0040]
Next, a second embodiment of the present invention will be described with reference to FIG. 8
and FIG. Also in the present embodiment, as in the first embodiment described above, the
speaker device is connected to the audio reproduction system, and is used, for example, in the
system configuration shown in FIG.
[0041]
FIG. 8 is a diagram showing the configuration of the speaker device 200 of this example. In the
case of a two-channel configuration as shown in FIG. 1, two speaker devices 200 are used. In this
example, the speaker device 200 is a so-called 3-way speaker device including a low-range
speaker unit, a mid-range speaker unit, and a high-range speaker unit.
[0042]
Then, for the low band speaker unit, the low band large signal speaker unit 201 and the low band
small signal speaker unit 202 are prepared, and for the middle band speaker unit, the mid band
large signal speaker unit 203 and the middle band A small signal speaker unit 204 is prepared.
The high frequency speaker unit is configured to output a large signal to a small signal with one
high frequency speaker unit 205. In the configuration example shown in FIG. 8, the speaker unit
for low band, the speaker unit for mid band, and the speaker unit for high band are arranged in
order from the bottom, and further, a large signal unit and a small signal unit in each band Are
arranged horizontally, but this unit arrangement is an example and is not limited to this
arrangement. Further, the units may be housed in a plurality of housings without housing all the
units integrally in one housing constituting the speaker device 200. Alternatively, in the case of
an audio reproduction system for a vehicle, each speaker unit may be disposed in each part in
the vehicle so that a listener such as a driver can optimally hear.
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[0043]
The configuration of dividing an input audio signal into three bands of low, middle and high
bands is conventionally applied to, for example, a speaker device having a 3-way configuration
such as band division with filters for each band. The configuration is applicable. The
conventionally applied bands can be applied to the three bands of the low band, the middle band,
and the high band.
[0044]
Then, for the low-band input audio signal and the mid-range input audio signal divided into
bands, applying the configuration of FIG. 2 described in the first embodiment described above, a
large signal of a predetermined level or higher And small signals below a predetermined level,
and the respective signals are supplied to the speaker unit for the corresponding signal. That is,
the low-range large signal is supplied to the low-range large signal speaker unit 201 and output,
and the low-range small signal is supplied to the low-range small signal speaker unit 202 and
output. A large mid-range signal is supplied to and output from the mid-range large signal
speaker unit 203, and a small mid-range signal is supplied to the mid-range small signal speaker
unit 204 and output.
[0045]
FIG. 9 is a diagram showing an example of output characteristics of the speaker device of this
example. As shown in FIG. 9A, the sensitivity in terms of frequency is divided into three bands of
low band L, middle band M, and high band H. The low band L is output from the low band large
signal speaker unit 201 and the low band small signal speaker unit 202. The mid range M is
output from the mid range large signal speaker unit 203 and the mid range small signal speaker
unit 204. The high frequency H is output from the high frequency speaker unit 205.
[0046]
Here, for the low band L, as shown in FIG. 9B, the speaker unit 201 for low band large signal of
the characteristic S21 that outputs a signal of a predetermined level V1 or higher and a signal of
a predetermined level V1 or lower By being divided into the low-pass small-signal speaker unit
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202 of the characteristic S22 to be output, a characteristic close to a linear ideal characteristic x
can be obtained as a comprehensive input / output characteristic in the low-pass.
[0047]
As for the middle band M, as shown in FIG. 9C, the speaker unit 203 for middle band large signal
of the characteristic S31 which outputs a signal of a predetermined level V1 or more and the
characteristic of outputting a signal of a predetermined level V1 or less By dividing the signal
into the middle and small signal speaker units 204 in S22, a characteristic close to the linear
ideal characteristic x can be obtained as a comprehensive input / output characteristic in the
middle.
[0048]
According to the three-way speaker apparatus 200 configured in this way, the band handled by
each speaker unit may be a narrow band compared to the full-range type, and it may be better to
use good characteristics for each band. Since good characteristics of the 3-way speaker device
can be secured, and in the present example, the speaker unit is divided into a large signal and a
small signal in the low range and the mid range, so the low range can be obtained. The linearity
of the input / output characteristics in the middle region and the middle region is ensured, and a
speaker device with better characteristics can be obtained.
[0049]
In the configuration example of FIG. 8, the speaker unit in the high band is configured to output
small signal to large signal by one speaker unit, but the speaker unit in the high band is also
similar to the other bands, The speaker unit may be divided into a large signal and a small signal.
However, for the high frequency speaker unit, the diaphragm is relatively small and light weight
and relatively good input / output characteristics, and as in the configuration shown in FIG. 8,
one high frequency speaker unit is configured. Even in this case, relatively good characteristics
can be secured.
[0050]
As shown in FIG. 9, for the predetermined level V1 for dividing the low band by the two speaker
units 201 and 202 and the predetermined level V1 for dividing the middle band by the two
speaker units 203 and 204, the loudspeakers in respective bands It may be selected according to
09-05-2019
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the characteristics of the unit, and does not have to be at the same level.
[0051]
Although the configuration of the second embodiment shown in FIGS. 8 and 9 is an example
configured as a three-way speaker device, a two-way configuration in which the speaker unit is
divided into a low band and a high band is described. The speaker apparatus may be configured
to output only the low band speaker unit or both the low band and high band speaker units with
two speaker units divided in sound pressure into a predetermined level or higher and a lower
level. .
[0052]
Moreover, although application to the system for 2-channel audio reproduction shown in FIG. 1
was assumed in each embodiment mentioned above, you may comprise as a speaker apparatus
for multi-channel audio reproduction of 5.1 channels etc. .
In the case of this multi-channel reproduction system, for example, by making the speaker device
used as a center speaker the above-mentioned sound pressure division type speaker device, the
effect of making the sound clearer while maintaining a sense of spread is realized. Have.
[0053]
In each of the above-described embodiments, although the specific detailed configurations of the
large signal speaker unit and the small signal speaker unit have not been particularly described,
speaker units of various configurations suitable for reproduction of the respective signal levels
are described. Is applicable.
That is, both the large signal speaker unit and the small signal speaker unit may be dynamic
speaker units that are general-purpose speaker units. For example, for small signal speaker units,
a capacitor type speaker unit May be used.
[0054]
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It is a block diagram showing an example of system composition by a 1st embodiment of the
present invention.
It is a block diagram showing an example of composition of a speaker apparatus by a 1st
embodiment of the present invention.
FIG. 3 is a circuit diagram showing a configuration example of a vibration suppression circuit of
the speaker device according to the first embodiment of the present invention. It is explanatory
drawing (example 1) which showed the structural example of the vibration part of the speaker
unit by the 1st Embodiment of this invention. It is explanatory drawing (example 2) which
showed the structural example of the vibration part of the speaker unit by the 1st Embodiment of
this invention. It is an explanatory view showing an example of a characteristic of a speaker unit
by a 1st embodiment of the present invention. It is the perspective view which showed the
example which coaxially arrange | positioned each unit of the speaker apparatus by 1st
Embodiment of this invention. It is the block diagram which showed the example at the time of
making the speaker apparatus by the 2nd Embodiment of this invention 3 way composition. It is
explanatory drawing which showed the example of a characteristic at the time of setting it as 3
way structure of the example of FIG. It is explanatory drawing which showed the example of an
output waveform of the conventional speaker. It is explanatory drawing which showed the
example of the signal level of the conventional speaker. It is explanatory drawing which showed
the output characteristic example (a) of an ideal speaker, and the output characteristic example
(b) of the conventional speaker. It is explanatory drawing which showed the example of the
input-output characteristic of the conventional speaker.
Explanation of sign
[0055]
DESCRIPTION OF SYMBOLS 10 ... Audio signal source, 20 ... Amplifier apparatus, 30, 30 ', 30L,
30R ... Speaker apparatus, 31, 31L, 31R ... Large signal speaker unit, 32, 32L, 32R ... Small signal
speaker unit, 34 ... Small Amplitude suppression circuit, 35: large amplitude suppression circuit,
101: magnetic circuit, 102: gap, 104: voice coil, 105, 106: plate for generating reverse magnetic
field, 200: speaker device, 201: speaker unit for low range large signal, 202: Low-pass smallsignal speaker unit 203: Mid-range large-signal speaker unit 204: Mid-range small-signal speaker
unit 205: high-pass speaker unit
09-05-2019
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