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JP2014053836

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DESCRIPTION JP2014053836
Abstract: If a speaker system in which a duct or a horn is attached to a cabinet is used, the sound
pressure in a specific frequency range in the low range is increased to contribute to the
expansion of the bass. However, there is a problem that the bass becomes unclear due to
resonance or resonance generated in a cabinet, a duct or a horn. A super tweeter is disposed
inside a cabinet and electrically connected in parallel with a speaker unit installed outside the
cabinet. The sound wave emitted from the super tweeter to the inside of the cabinet improves the
sound quality of the bass emitted from the inside of the cabinet. [Selected figure] Figure 1
Speaker system with super tweeter
[0001]
The present invention is a technology relating to sound quality improvement of a speaker system
that expands bass by a cabinet having an opening.
[0002]
Conventionally, a speaker cabinet is a means for expanding the bass of the speaker unit.
That is, in the closed cabinet, it serves as a baffle plate that separates the sound waves emitted
from the front and back of the speaker unit so as not to cancel. Furthermore, there is a technique
in which an opening is provided in a cabinet, and a horn or a duct is attached to the opening to
increase the sound pressure in a specific low frequency range. In the conventional bass reflex
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speaker system, the opening of the cabinet is ducted to invert the low frequency resonance
occurring inside the cabinet and radiate it to the outside. Then, since the phase can be adjusted
so as not to cancel the sound wave emitted from the speaker unit attached to the front of the
cabinet to the front, the bass region can be expanded. Also, in the back-loaded horn speaker
system, attach a horn behind the speaker unit. The resonance of the horn enlarges the lowpitched region and emits an acoustic wave from the opening of the horn. Similarly, when the
inside of the cabinet is divided by the guide plate into a bent horn shape, the cabinet itself
becomes a horn. Furthermore, in so-called subwoofers and super woofers that are connected in
addition to a speaker system that lacks bass, a structure called a Kelton type is employed. In the
Kelton type, a speaker unit for reproducing bass is installed in a sealed cabinet, the front is
covered with a cabinet, a part of the front cabinet is opened, and a duct is attached to the
opening. When the sound wave compressed in the front cabinet is emitted from the duct to the
outside, the sound pressure in the specific low frequency region is increased to become a speaker
system dedicated to bass. As described above, the conventional speaker system for expanding the
low range has a structure that utilizes resonance or resonance, and in order to obtain good sound
quality, the rigidity of the cabinet, the duct and the horn is enhanced, and a sound absorbing
material is used to make noise. Have been devised to mechanically reduce
[0003]
On the other hand, it is known that adding a super tweeter, which is a speaker that reproduces an
ultra-high range to the outside of a cabinet, to a conventional speaker system can provide a sense
of sound spread and a clear and realistic sound field. However, since there is no clear definition
of the super tweeter, in the present invention, the speaker mainly reproduces the frequency
range of 15 kHz to 40 kHz or more, and reproduces the outside of the audible band above the
frequency range reproduced by the so-called tweeter. Point to a speaker used for the purpose of
That is, it is a speaker in which the activity rate at most frequencies of 15 kHz to 40 kHz is larger
than the activity rate of most frequencies of 15 kHz or less. Of course, the higher the playback
frequency range is above 40 kHz, the better the performance as a super tweeter.
[0004]
Conventional super tweeters are of various types such as dynamic type, ribbon type, ceramic
piezoelectric type, and polymer piezoelectric type. The inventor of the present invention has so
far filed and patented an accordion-shaped electro-acoustic transducer which has been free
edged in Japanese Patent Application No. 2003-113956. Also, an electro-acoustic transducer is
filed in PCT application 2008-044062. Both are electrodes formed on the front and back of the
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polymeric piezoelectric film, and are piezoelectric speakers configured to have a wave-like shape.
The depth of the valleys of this wave is made shallow and the pitch is made small. Has created a
super tweeter to play high frequency. The supertweeter other than the supertweeter which is
composed of the corrugated polymer piezoelectric film proposed by the present inventor has a
considerable efficiency even at a frequency of 15 kHz or less. Therefore, in general, 15 kHz or
less is mainly cut through a high pass filter constituted by a capacitor, a coil and the like. And
these super tweeters are arranged towards the outside of the cabinet like other speaker units.
The purpose is to improve the sound quality of high-pitched sound radiated directly from the
front radiation surface of the speaker unit arranged in the speaker system.
[0005]
Japanese Patent Application No. 2003-113956
[0006]
When the sound wave emitted from the speaker unit into the cabinet is discharged through the
duct or the horn to the outside of the cabinet, the sound pressure in the specific low frequency
range is increased to contribute to the expansion of the low range.
However, there is a problem that the low range becomes unclear due to resonance or resonance
generated in a cabinet, a duct or a horn. As a result, the sound quality of the speaker system is
degraded, and those seeking sound clarity prefer a closed speaker system that does not emit the
sound in the cabinet.
[0007]
In order to solve the above-mentioned problems, the invention according to claim 1 is a speaker
system in which an opening is provided in a cabinet to expand the low range, and a super
tweeter, which is a speaker that mainly reproduces a frequency range of 15 kHz to 40 kHz,
Arrange in parallel and electrically connect with the speaker unit installed in the cabinet. That is,
the same electrical signal for driving the speaker system is input to the super tweeter attached to
the inside of the cabinet, and the sound wave emitted from the super tweeter is emitted to the
inside of the cabinet.
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[0008]
The invention of claim 2 is characterized in that, in the speaker system having a duct at the
opening of the cabinet, the effect of the invention of claim 1 is further enhanced by arranging a
super tweeter inside the duct.
[0009]
The effect of the sound quality improvement obtained by the present invention is based on the
result of trial listening because there is no measurement means yet.
[0010]
First, the effects of the invention of claim 1 will be described.
The super tweeter defined in the present invention was attached to the inside of the cabinet, and
the same signal as the music signal input to the speaker unit attached to the outside of the
cabinet was input to the super tweeter and auditioned.
Then, in the bass reflex speaker system in which the cabinet is ducted, the sound of the bass
region which is lifted by phase inversion by the duct becomes clear, and the effect of the
midrange sound overhanging forward is obtained. In addition, in the back load horn speaker
system, tightness came out due to overlying bass and the clarity became better. The effect
improved the sense of separation of middle and low range instruments in addition to the rich
bass feel. Also, with the Kelton-type subwoofer, the expansion of the bass became clearer.
[0011]
The invention of claim 2 is based on the finding that the effect of claim 1 is most enhanced when
a super tweeter is attached to the inside of the duct in a ducted bass reflex speaker system or a
Kelton-type speaker system.
[0012]
It is side surface sectional drawing of Example 1 of this invention.
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It is side surface sectional drawing of Example 2 of this invention. It is side surface sectional
drawing of Example 3 of this invention. It is side surface sectional drawing of Example 4 of this
invention. It is side surface sectional drawing of Example 5 of this invention.
[0013]
The super tweeter defined in the present invention is attached to the inside of a cabinet having
an opening, and a speaker unit directed to the outside of the cabinet and the super tweeter are
electrically connected in parallel. That is, the sound wave of the super tweeter is radiated to the
inside of the cabinet.
[0014]
A side cross-sectional view of Example 1 is shown in FIG. FIG. 1 shows a general two-way speaker
system comprising a cabinet 1 with a full range speaker unit 2 for reproducing middle and low
frequencies, a tweeter 3 for reproducing high frequencies, and a network circuit 4. Then, in order
to expand the low region, the opening 5 is opened in the cabinet 1 and the duct 6 is attached.
Other speaker terminals 7 and speaker terminals 8 are also provided. The full range speaker unit
2 and the tweeter 3 are electrically connected to the speaker terminals 7 and 8 through the
network circuit 4. That is, the full range speaker unit 2 and the network circuit 4 are connected
by the cables 9 and 10, the tweeter 3 and the network circuit 4 are connected by the cables 11
and 12, and the network circuit 4 and the speaker terminals 7 and 8 are the cables 13, 14
Connect with So far, although it is a conventional bass reflex speaker system, a super-tweeter 15
of polymer piezoelectric wave type by Takety Co. is added. In the present embodiment, a super
tweeter 15 is pasted with double-sided tape behind the magnet section 16 of the full range
speaker unit 2. At that time, as long as the sound wave emitting surface 17 is not sealed, it may
be directed in any direction of the internal space 18. Further, even if the installation place of the
super tweeter 15 is inside the cabinet 1, that is, the internal space 18 even after the magnet unit
16, the gist of the invention is the same. A polymer piezoelectric wave supertweeter 15 is
commercially available. Also, the super tweeter terminals 19 and 20 and the speaker terminals 7
and 8 are electrically connected using the cables 21 and 22. Therefore, as shown in FIG. 1, the
full range speaker unit 2, the tweeter 3 and the super tweeter 15 are electrically connected in
parallel. In the case where a plurality of speaker units are electrically connected in parallel in the
present invention, the gist of the present invention is the same even if the respective speaker
units are connected in reverse phase. By the way, although not shown in the drawing, the super
piezoelectric tweezers 15 of the polymeric piezoelectric wave type may boost the electric signal
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inputted to the speaker terminals 7 and 8 with a transformer and may input it to the super
tweeter terminal 19.20. . In other dynamic super ribboners and ribbon super tweeters, the
electric signal may be high-passed with a high pass filter and input to the super tweeter.
Therefore, in the present invention, a speaker unit body including a transformer and a filter will
be described as a super tweeter.
In the present embodiment, a two-way speaker system is used as an example of the bass reflex
speaker system. However, the gist of this embodiment is the same even in a multiway speaker
system in which one way or a plurality of other units are mounted.
[0015]
Next, the operation of the first embodiment will be described. An electric signal such as a music
signal is input from the amplifier to the speaker terminals 7 and 8. Then, the degree of overlap of
the middle low and high frequencies is adjusted by the network circuit 4. The electrical signal
passing through the network circuit 4 drives the full range speaker unit 2 and the tweeter 3 to
emit sound waves to the front 23 of the cabinet 1. On the other hand, to the rear 24 of the full
range speaker unit 2, the sound wave of the opposite phase to the sound wave radiated to the
front 23 is emitted to the inside of the cabinet 1. However, since the rear of the tweeter 3 is
sealed, no sound wave is emitted from the tweeter 3 to the inside of the cabinet 1. Inside the
cabinet 1, air is compressed to increase stiffness and increase sound pressure in the bass region.
The compressed air is radiated from the opening 5 through the duct 6 to the outside of the
cabinet 1. In the duct 6, the phase of the sound wave emitted is inverted and is in the same phase
as the sound wave emitted forward 23, so that the bass is enlarged and emphasized. At this time,
the sound wave emitted from the super tweeter 15 is integrated with the sound wave emitted to
the inside of the cabinet 1 from the rear 24 of the full range speaker unit 2 and is emitted from
the opening 5. The sound wave emitted from the super tweeter 15 has the function of defining
the rise time of the sound wave emitted from the rear of the full range speaker unit 2. When the
super tweeter 15 is not attached, the bass range expands but is a blurred bass, but when the
super tweeter 15 is attached, the bass range is contoured and a fine bass with high resolution is
obtained.
[0016]
Next, Example 2 will be described with reference to FIG. A plurality of guide plates 26 are fixed to
the inside of the cabinet 25. As for the space in the cabinet 25, the space 28 behind the full
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range speaker unit 27 is the narrowest, the space 29, the space 30, and the space 31 gradually
widening. A wide opening 32 is opened in the widest space 31 to form a horn as a whole. The full
range speaker unit 27 is electrically connected to the speaker terminals 35 and 36 by the cables
33 and 34. That is, it is a back load horn system generally known widely so far. Furthermore, in
the present embodiment, a super piezoelectric tweezer 15 of a polymeric piezoelectric wave type
is pasted to the back of the magnet section 37 of the full range speaker unit 27 with a doublesided tape. At that time, the sound emitting surface 17 is directed to the space 28 of the cabinet
25. However, even if the installation location of the super tweeter 15 is inside the cabinet 25
even after the magnet unit 37, the gist of the invention is the same. Next, the super tweeter
terminals 19 and 20 of the super tweeter 15 are electrically connected to the speaker terminals
35 and 36 by the cables 38 and 39, respectively.
[0017]
In the operation of the second embodiment, the sound waves radiated to the rear of the full
range speaker unit 27 are amplified by the horn formed by the spaces 28, 29, 30, 31 inside the
cabinet 25 to create rich bass. However, since the medium sound and the sound are slightly
blurred, and the nature is different from the sound directly radiated to the front of the full range
speaker unit 27, there is a problem that the sound quality of the medium and low range and the
high tone is not connected. However, when the super tweeter 15 is attached to the inside of the
cabinet 25, the sound wave emitted from the super tweeter 15 is integrated with the sound wave
emitted behind the full range speaker unit 27 and radiates from the opening 32. At this time, as
in the first embodiment, the sound waves emitted from the super tweeter 15 clarify the rise of
the sound waves in the process of expanding the low region. Then, in addition to the rich bass
feeling, the sense of separation of the middle-low range musical instrument was improved
because the tightness was given to the excessively low-passed band and the clarity was
improved. The sense of incongruity of the connection between high and low range was also
eliminated.
[0018]
A third embodiment will now be described using the Kelton-type speaker system of FIG. The full
range speaker unit 42 is attached to the front surface 41 of the cabinet 40. The full range
speaker unit 42 may be a speaker unit dedicated to bass. Then, a front cabinet 43 is installed in
front of the full range speaker unit 42, and an opening 44 is provided in the front cabinet 43 and
a duct 45 is attached. Further, the super tweeter 15 is pasted to the front surface 41 of the
cabinet 40 with double-sided tape so that the sound wave emitting surface 17 faces the inside of
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the front cabinet 43. The full range speaker unit 42 and the super tweeter 15 are electrically
connected in parallel to the speaker terminals 46 and 47 as in the first and second embodiments.
[0019]
Next, the operation of the third embodiment will be described. The sound waves emitted by the
full-range speaker unit 42 into the front cabinet 43 resonate at a frequency in the low frequency
region according to the volume of the front cabinet 43, and the phase is reversed in the duct 45.
It is emitted to the outside of 43. The sound waves radiated to the rear of the full range speaker
unit 42 are sealed by the cabinet 40 so that they do not leak to the outside. Therefore, the
Kelton-type speaker system is widely used as a subwoofer or a superwoofer, since the
frequencies in the low-pitch range created by resonance in the cabinet 43 are mainly radiated.
The super tweeter 15 emits a sound wave of a high frequency region necessary as a rising
component of sound to the inside of the front cabinet 43 which creates resonance. Then, the low
tone which tends to stagnate at the resonance is clearly emitted from the opening 44. That is, the
super tweeter 15 exerts an effect not on the direct sound emitted by the full range speaker unit
42 but on the bass produced by the front cabinet 43.
[0020]
A fourth embodiment shown in FIG. 4 is the same bass reflex speaker system as the first
embodiment. In the fourth embodiment, the super tweeter 15 is installed in the inside of the
cabinet 1, in particular, inside the duct 6. Others are the same as Example 1.
[0021]
Next, the operation of the fourth embodiment will be described. When the super tweeter 15 is
installed in the magnet unit 16 as in the first embodiment, most of the sound waves emitted from
the super tweeter 15 are absorbed inside the cabinet 1. Even though this is effective in improving
the sound quality, when the super tweeter 15 is installed inside the duct 6, most of the sound
waves emitted from the super tweeter 15 are emitted from the opening 5. When listening to the
sound, when the super tweeter 15 was installed inside the duct 6, the highest sound quality
improvement effect was obtained.
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[0022]
Next, a fifth embodiment shown in FIG. 5 is the same Kelton-type speaker system as the third
embodiment. In the fifth embodiment, the super tweeter 15 is installed in the inside of the front
cabinet 43, in particular, inside the duct 45. Others are the same as Example 3.
[0023]
Next, the operation of the fifth embodiment will be described. When the super tweeter 15 is
installed on the front face 41 of the cabinet 40 as in the third embodiment, most of the sound
waves emitted from the super tweeter 15 are absorbed inside the cabinet 40. Even though this is
effective in improving the sound quality, when the super tweeter 15 is installed inside the duct
45, most of the sound waves emitted from the super tweeter 15 are emitted from the opening
44. As a matter of fact, when the Super Tweeter 15 was installed inside the duct 45, the highest
sound quality improvement effect was obtained.
[0024]
You can improve the bass sound quality of the speaker system that expands the bass area by
attaching a cabinet or a horn.
[0025]
1 cabinet 2 full range speaker unit 3 tweeter 4 network 6 duct 15 super tweeter 26 guide plate
32 opening 43 front cabinet
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