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JP2015130581

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DESCRIPTION JP2015130581
A speaker system which is small and excellent in bass reproduction performance. [Solution
means] [Selection figure]
Sound reproduction system
[0001]
The present invention relates to a small speaker system with excellent super bass reproduction
performance and a method of extracting bass radiation from the speaker system.
[0002]
With the spread of high-performance players embedded in mobile terminals as of December
2013, there is a contradiction between the {small size} and {excellent super bass reproduction
performance} in the speaker system market. In the current situation where competition for
products in the market is intensifying at a factor, the level of bass reproduction performance is
increased by {method of combining active driver and passive radiator}.
However, despite being significantly superior to those of several years ago, there is a demand for
an endless improvement in bass reproduction performance in the market.
[0003]
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1
In the conventional {driver and passive radiator} approach, {the performance of the active driver
determined by the limitations of the cost and the appearance design} influences the performance
of the speaker system. There are two main factors necessary to secure the bass driver's
performance of the active driver. The first is {the magnitude of the force generated by the voice
coil under a constant current condition} and the second {the size of the movable range of the
voice coil capable of securing the same driving force under a constant current condition}.
Roughly speaking, it is focused on the task of how much large and / or how high performance
permanent magnets are used. Smaller speakers use {expensive, high-performance permanent
magnets, typically neodymium magnats}, which makes a compromise in cost and performance
comparison.
[0004]
As of 2013, there is one common problem in {the process from specification of goods to the
completion of design} of many small speaker systems manufactured and sold. The common issue
is that the design in consideration of {both features and weaknesses} is deeply pursued in the
relation between {vibration system of driver or speaker system} and {signal processing of
electronic circuit section including power amplification}. There is no point. The main reason is
that the coordination system between {Product planning} and {Manufacturing centering on
assembly} and {Manufacturing drivers for vibration system as parts} and {Determining signal
processing necessary for finishing sound quality} It is because you can not get it. This is one of
the biggest causes for the optimal response to be difficult for the problem of reproducing the
best sound quality with a limited cost range. The ones who engage in signal processing systems
are lacking in deep knowledge of vibration systems, and the ones who are engaged in vibration
systems are lacking in deep knowledge of signal processing systems are usually. Today, where
{smaller} and {more powerful bass or wider bass reproduction range} are sought endlessly, the
greatest effect should be drawn by {coordination of both the oscillating system and the signal
processing system}.
[0005]
There are no patent documents and non-patent documents that serve as references.
[0006]
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2
First, it is not intended to improve bass performance by changing the quantity and quality of
permanent magnets, but to substantially improve bass reproduction performance with the same
quantity and quality of permanent magnets.
A significant improvement, albeit experimental, is {an octave or two octave improvement in the
bass reproduction frequency range}.
[0007]
Secondly, {vibration system and signal processing system} to achieve the maximum effect from a
comprehensive viewpoint {structure of vibration system whose design method and procedure can
be improved}.
[0008]
Thirdly, the improvement of the performance of the speaker system is often required to improve
the other factor by the improvement of one factor.
In particular, when trying to improve the performance of the entire speaker system with only the
active driver, it is necessary to seek a trade-off point in performance that is in a trade-off
relationship.
[0009]
The following terms are defined in the following description, and in the full text including claims.
The terms defined in one claim are the same in the other claims and in the specification. Design
means to {define the finished state of parts and products on a desk}. The vibration system means
mechanical vibration. The signal processing system means {a function to apply an intended
action to an input acoustic signal by an analog electronic circuit or digital calculation}. The inside
of {} has priority over the outside of {}.
[0010]
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The first essence of the present invention is to make the active driver also function as a passive
radiator. The radiation space of the cone is designed by designing a vibration system so that the
phase of {the vibration of the active driver} and {the vibration of the cone with respect to the
magnetic circuit} is in the vicinity of the target low frequency reproduction frequency.
Significantly increase the vibration to And, since {load caused by vibration of cone} increases in
{low-range minimum impedance frequency}, it is not necessary to suppress vibration by the
damper, and the stiffness of the damper can be designed small. This also contributes to
increasing the conversion efficiency of the speaker system.
[0011]
In order to satisfy the above-mentioned vibration, a second edge is provided on the outer
periphery of the frame of the active driver, and the second edge is fixed to the enclosure. The
role of the second edge is to {give freedom to allow the active driver to vibrate relative to the
enclosure}. The second frame is responsible for securing {the active driver and the double edge
driver consisting of the second edge and the second frame} to the enclosure. The case where the
second frame and the enclosure are shared parts is also included.
[0012]
The {low band minimum impedance frequency} is in the target low band reproduction band. The
main factors that determine {low frequency minimum impedance frequency} are the radiation
area of the active driver cone, the mass of the cone and voice coil, the mass of the entire active
driver, the stiffness of the first edge and damper, the stiffness of the second edge, the active
There is a radiation area of the whole driver, the volume of the enclosure. The main factors that
determine the strength are the driving power of the magnetic circuit and the voice coil. In
designing {low band minimum impedance frequency}, physical constants of the above factors are
selected to the extent possible. Since the mass possessed by the active driver is large in the mid
to high frequency band, the vibration system has the same conditions as when the active driver is
fixed.
[0013]
The second essential aspect of the present invention is to make the second edge function with a
porous plastic material. In the case where {small active drivers play {strong bass}}, many
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problems must be solved. One of them is the phenomenon that the abnormal vibration mode is
entered due to some factors such as edge material and structure at the time of bass reproduction.
Since the level at which the abnormal vibration mode is exited is lower than the level at which
the abnormal vibration mode is entered, the abnormal sound due to this phenomenon
significantly reduces the quality of the speaker system. Since the second edge supports a heavy
active driver and the vibration amplitude is often larger than the first edge, the avoidance of the
abnormal vibration mode is an important issue. The abnormal vibration mode is caused by local
{nonlinearity, asymmetry, resonance}, and the like. In either case, the {elasticity and viscosity} of
the porous plastic {maintains the function of the second edge} and {reduces significantly the
cause of the anomalous vibration mode}.
[0014]
The third of the essence of the present invention is to provide {double edge driver at the front of
the enclosure}, {rear same {double edge driver at the front} or {passive radiator}} to reduce the
vibration of the enclosure and to reproduce the bass I am trying to improve my ability. The
feature of the speaker system of the present invention lies in its excellent bass reproduction
ability, but the vibration to the enclosure is large due to the vibration of the active driver itself. It
is necessary to suppress the overall vibration.
[0015]
However, to increase the mass of the speaker system, it is necessary to use unnecessary materials
for that purpose, and it is also necessary to reinforce the packaging material of the product. By
providing {active drivers or passive controllers} on the back of the enclosure, the {front and back}
accelerations can be offset to obtain a speaker system with a light but powerful bass
reproduction performance. Since the bass radiation area is also increased, the bass radiation
efficiency is significantly improved in the range where the front and back are in phase.
[0016]
The fourth essential aspect of the present invention lies in providing {a bass reproduction
capability for the vibration system} and {a function for extracting the capability of the vibration
system and suppressing the weakness} for the signal processing system. By optimally distributing
{the role of the vibration system} and {the role of the signal processing system}, it is possible to
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exclude from the design of the vibration system the troublesome factor {must ensure the balance
of the whole sound quality}. With regard to the design of the vibration system of the present
invention, it is important to have a regenerative ability, but the regenerative characteristics are
not important. The target reproduction characteristic can draw out its reproduction ability by
using a signal processing system. If there is no reproduction capability, the improvement of
characteristics can not be expected by using any signal processing system, but if there is a
capability, the improvement is possible.
[0017]
Heretofore, in general, active drivers as components have been required to solve a number of
contradictory problems in design because {the balance between bass reproduction performance
and overall sound quality characteristics is required}. . In the active driver according to the
method of the present invention, the importance of the overall sound quality characteristics is
low, and only the ability to reproduce the bass is required, which greatly simplifies the conditions
to be considered in design.
[0018]
The fifth essential aspect of the present invention is to transmit the double edge driver's
{intensified vibration in the bass reproduction region} to another structure, and {use the nature of
multiple resonances of the structure}, It is where you get more powerful bass playback. The
speaker system with only the double edge driver and the enclosure generates strong vibration
during high volume playback. By transmitting this vibration to a strong structure and utilizing
the multi-resonance property of the structure, strong bass radiation can be realized. The
frequency characteristic in this case is not necessarily uniform in the bass reproduction range. It
is extremely effective in a structure such as a part of a car (a part of a chassis, a windshield, a
dashboard, etc.) such as a structure having a complex multiple resonance including fixing
methods. In addition, the weight of the {double edge driver and enclosure} can be designed to be
extremely light (compared to conventional loudspeaker systems with comparable bass
reproduction capabilities). According to the experimental results, the bass reproduction ability
can be designed to be the same as that of the conventional method even if the weight is less than
half.
[0019]
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When designing a double edge driver, {Relationship between size of compatible enclosure and
bass reproduction ability} {Relation between compatible enclosure size, specification of passive
radiator and bass reproduction ability} {mass and acceleration of loudspeaker system voiced in
the bass region By clarifying specifications such as {relationship}, the application design of a
speaker system having a double edge driver or a double edge driver can be simplified. In
designing the signal processing, it is possible to simplify the design of the entire speaker system
including the signal processing by clarifying the specifications of the optimal band-cooperative
filter corresponding to the above conditions.
[0020]
Claim 1 relates to a loudspeaker system having a double edge, and to a basic structure of the
loudspeaker system of the present invention. Claim 2 relates to the case where the outer edge of
the loudspeaker system with double edge is made of porous plastic material. Claim 3 relates to
the case where double edge drivers are provided on the front and back of the enclosure. A fourth
aspect relates to a speaker system provided with a double edge driver on the front of the
enclosure and a passive radiator on the back. A fifth aspect of the present invention relates to a
speaker system for a passenger car when a speaker system having a double edge driver is
mounted on a structure of a passenger car. The sixth aspect relates to the case where a closed or
near closed structure of a passenger car is used instead of the enclosure of the speaker system
having the double edge driver. Claim 7 relates to a method of leaving to the signal processing a
method of maximizing the ability of a speaker system having a double edge driver.
[0021]
The invention produces the effects as described below. First, without changing the performance
of the active driver, and by the manufacturing method of the conventional manufacturing
method, it is possible to greatly improve the speaker system having a small size and excellent
bass reproduction capability. Second, the vibration system is not a bass reproduction
characteristic, but concentrates on the design of the bass reproduction ability {active driver and /
or double edge driver and / or passive radiator}, and the bass reproduction of the entire speaker
system Optimization can be left to signal processing. Third, the audio system for passenger cars,
which requires weight reduction and high performance, enables significant weight reduction.
[0022]
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The example of composition of an active driver. The block diagram of one Example of a double
edge driver. An example of a molded article of which the second edge is a rubber sheet. An
example of a porous plastic material whose second edge is porous. An example of a porous
plastic material whose second edge is porous. One example which provided the double edge
driver in the front and the back. Configuration example of passive driver. An example of
providing a double edge driver on the front and a passive radiator on the back. An embodiment
in which the double edge driver of the present invention is provided in the structure of a
passenger car. One Example which provided the speaker system of this invention in the structure
of {passenger car}. One Example which provided the speaker system of this invention in the
structure of {passenger car}. An explanatory view of synthetic vibration of a magnetic circuit with
a voice coil. An explanatory view of synthetic vibration of a magnetic circuit with a voice coil.
[0023]
First, the double edge driver as a part with two edges and two frames. Second, a small desktop
speaker system as a product. Third, the portable speaker system as a commodity Fourth, the
speaker system of a passenger car and / or the audio system
[0024]
Production and distribution of double edge drivers as parts. Production and distribution of
loudspeaker systems equipped with double edge drivers as products. Signal processing algorithm
or processor to optimally drive a double edge speaker system.
[0025]
FIG. 1 shows the structure of the active driver. 1 is a first frame, 2 are magnetic circuits, 3 is a
permanent magnet, 4 is a voice coil, 5 is a cone, 6 is a damper, and 7 is a first edge.
[0026]
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FIG. 2 shows the structure of the double edge driver of the present invention. {10 is an active
driver shown in FIG. 1, 11 is a second frame, and 12 is a second edge. A second edge is provided
to {first frame of active driver of 10}. The second frame is not a necessary condition, but is a
component necessary for {when treating a double edge driver as a finished part} or {for
facilitating attachment of the double edge driver to the enclosure}. The active driver moves
relative to the enclosure through the second edge. As the voice coil moves with respect to the
magnetic circuit, the vibration of the cone with respect to the radiation space will be the sum of
both, and the swing of the range in which both are in phase will be greatly increased. The
dynamic range can be significantly increased without increasing the linear range of the
relationship between the voice coil and the magnetic circuit.
[0027]
FIG. 3 shows an embodiment of the speaker system of the present invention. Reference numeral
15 is a double edge driver shown in FIG. 2, 12 is a second edge of the double edge driver, and 16
is an enclosure. In this embodiment the second frame is a common part with the enclosure.
[0028]
FIG. 4 shows an embodiment of a speaker system according to the present invention, in which
the second edge is a porous plastic material. 10 is an active driver shown in FIG. 1, 13 is a second
ring edge of the double edge driver, and 16 is an enclosure. In this embodiment the second frame
is a common part with the enclosure.
[0029]
FIG. 5 shows an embodiment of a speaker system according to the present invention, in which
the second edge is a porous plastic material. 10 is a double edge driver shown in FIG. 2, 14 is a
second ring edge of the double edge driver, and 16 is an enclosure. In this embodiment the
second frame is a common part with the enclosure.
[0030]
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FIG. 6 shows an embodiment of the speaker system of the present invention, in which double
edge drivers are provided on the front and back of the enclosure. Two 15 are double edge drivers
and 16 are enclosures. Since the front and back of the enclosure are completely symmetrical,
both vibrations do not have an opposite phase even in the very low frequency range, and the
bass reproduction performance is extremely good.
[0031]
FIG. 7 shows an example of the structure of a passive radiator. 8 is the edge of the passive
radiator, 9 is the weight.
[0032]
FIG. 8 shows an embodiment of the speaker system of the present invention, in which the passive
radiator of FIG. 7 is provided on the back of the enclosure. 11はダブルエッジドライバ、16は
エンクロージャ、17はパッシブラジエータである。 By optimally designing the constants, a
speaker system with almost no vibration can be obtained. It is the method of choice for smaller
and lighter speaker systems with excellent bass reproduction performance and no vibration. As a
rule of thumb, a {radiant area and mass passive radiator} of about the same extent as {a total of
the active area and mass of the active driver} is effective.
[0033]
FIG. 9 shows an embodiment of a speaker system according to the present invention, showing
the speaker system shown in FIG. 3 attached to a structure of a passenger car. 11 is a double
edge driver, 16 is an enclosure, and 18 is a structure of a passenger car. As a specific example of
the structure of a passenger car, a part of a solid body on the side of the dashboard in front of
the driver's seat, a lower part of a windshield, a strong dashboard, a ceiling, a headrest, etc. It is.
[0034]
FIG. 10 shows an embodiment of the speaker system according to the present invention, showing
the speaker system shown in FIG. 3 attached to a structure of a passenger car. 11 is a double
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edge driver, 16 is an enclosure, and 19 is a structure of a passenger car. As a specific example of
{structure of passenger car}, if the dashboard in front of the driver's seat is strong, it is effective
for bass reproduction. In order to avoid the generation of chattering noise due to dashboard
vibration, a speaker system of the type provided with a passive radiator on the back of the
enclosure is effective.
[0035]
FIG. 11 shows an embodiment of a speaker system according to the present invention, showing a
double edge driver shown in FIG. 2 attached to a structure of a passenger car. 11 is a double
edge driver and 20 is a structure of a passenger car. As a specific example of {structure of
passenger car}, if the dashboard in front of the driver's seat is strong, it is effective for bass
reproduction.
[0036]
FIG. 12 shows the vibration waveform of each part at {{low-frequency minimum impedance
frequency}} of {an embodiment of the speaker system according to the present invention}. 21 is a
vibration waveform for the magnetic circuit of the voice coil, 22 is a vibration waveform for the
active driver, and 23 is a vibration waveform for the radiation space of the cone. The figure
shows a perfect in-phase state for simplicity of explanation, but in actuality, in the frequency
range to be reproduced-this phase is designed to be within the range of plus or minus 90
degrees. By designing in such a vibration mode, a decisive effect can be obtained in bass
reproduction.
[0037]
First, the substantial linear extent of the cone is significantly increased without increasing the
linear extent of the magnetic circuit. That is, the regeneration ability can be greatly improved.
[0038]
Second, since the load per unit area of the cone increases, the vibration of the cone is suppressed,
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the vibration of the voice coil with respect to the magnetic circuit per unit input power decreases,
and the stiffness of the damper can be designed to be small accordingly. And power supply can
also be increased. That is, the regeneration ability can be greatly improved.
[0039]
Third, since the relatively large active driver itself vibrates largely, this vibration can be used. By
providing a passive radiator on the back and designing the vibration mode to be in phase with
the front radiation, the bass reproduction capability is further increased. By installing the speaker
system on a structure having multiple resonances and transmitting the vibration of the speaker
system to the multiple resonance system, strong bass radiation can be obtained.
[0040]
FIG. 13 shows the vibration waveform of each part in a frequency region lower than the
{minimum low frequency impedance frequency region} of {one embodiment of the speaker
system of the present invention}. 31 is a vibration waveform for the magnetic circuit of the voice
coil, 32 is a vibration waveform for the active driver, and 33 is a vibration waveform for the
radiation space of the cone. Since the vibration of the voice coil with respect to the magnetic
circuit and the vibration of the active driver are in opposite phase, the vibration of the cone with
respect to the radiation space is offset and reduced. In this region, the fundamental wave is
canceled, miscellaneous non-linear distortion remains, and the reproduction sound quality is not
good. Therefore, the constants are designed so that vibration modes in opposite phase to each
other do not enter the target bass reproduction region.
[0041]
As described above, {the need to grasp complicated vibration modes} makes the design method of
the speaker system much more complicated than before, but this is a design problem, and it is
conventional for manufacturing. Almost the same. The design of the active driver is much simpler
than before.
[0042]
1 First frame 2 Magnetic circuit 3 Permanent magnet 4 Voice coil 5 Cone 6 Damper 7 First edge
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8 Edge of passive radiator 9 Weight of passive radiator 10 Active driver 11 Second frame 12
Second edge 13 Second ring edge 14 Second ring Edge 15 Double Edge Driver 16 Enclosure 17
Passive Radiator 18 {Car Structure} 19 {Car Structure} 20 {Car Structure} 21 Voice Coil for
Magnetic Circuits 22 Vibration Waveform for Double Edge Driver 23 Vibration waveform for
acoustic radiation space 31 Vibration waveform for magnetic circuit of voice coil 32 Vibration
waveform for double edge driver 33 Vibration waveform for acoustic radiation space of voice coil
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