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JP2013090093

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DESCRIPTION JP2013090093
Abstract: [Problem] To provide a harmonic overtone speaker capable of creating a harmonic
overtone based on a sound source speech signal simultaneously with reproduction of the sound
source speech signal. A first panel is fixed to a frame, and a rod-shaped bus bar is fixed to one
side of the first panel, thereby expanding the acoustic characteristics of the rod-shaped bus bar
fixed side of the first panel to a lower frequency band. To generate vibration according to each
area in the first and second panels based on a configuration in which the other side area without
bar bars of the first panel is fixedly connected to the second panel via the bar sound post. This is
a harmonic speaker that enables the creation of harmonics based on the sound source sound
signal as well as the reproduction of the sound source sound signal. [Selected figure] Figure 1
Harmonic speaker
[0001]
The present invention relates to a harmonic speaker technology that superimposes a harmonic
sound emitted from a digitally recorded speech signal as a fundamental sound on a sound wave
that mainly reproduces and emits a digitally recorded speech signal.
[0002]
In the digital recording technology of music, the frequency components of the audio signal
contained in the sound source are limited to a certain range by the sampling frequency and the
cutoff frequency, so that the attractiveness of the reproduced music using the music CD is
particularly reduced, It has caused a situation where stereo enthusiasts, who have existed in
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many of the record era, will be drastically reduced.
Since the recording band of the music CD was determined on the basis of the human audible
range, about 20 kHz or more was truncated in the high frequency band. However, in the journal
of the American Physiological Society, it is precise that when the sound wave outside the audible
range is superimposed on the sound wave in the audible range, the alpha wave in the back of the
head and the local blood flow in the brainstem and thalamus increase and the listener feels
pleased Reports based on brain physiological experiments have been made (Non-patent
Document 5).
[0003]
As a reproduction device of an audio signal, especially in a small speaker, an electrodynamic
conversion type device provided with a cone type diaphragm has been generally used for a long
time as a dynamic speaker. A dynamic speaker with a cone-shaped diaphragm is designed so as
not to cause split resonance of the diaphragm itself (Non-patent documents 1 and 2), so when
playing a music CD, it was recorded on the music CD Naturally, only the sound in the frequency
band is generated, and the other sounds are not generated. FIG. 14A shows a pair frequency
power spectrum of sound waves emitted by a commercially available dynamic speaker (type
QriomSP-250, Yamazen) driven by a 440 Hz audio signal. At first glance, it will be understood
that the dynamic speaker faithfully emits only the 440 Hz sound wave with respect to the
supplied 440 Hz sound signal.
[0004]
On the other hand, since 1980's, the speaker technology which made the flat panel the
diaphragm was proposed (patent documents 1 and 2). The flat panel type speaker technology
has a completely different sound generation principle from the cone type speaker in that sound
waves are generated by the divided resonance of the flat diaphragm itself. The inventors noted
that when the flat panel type speaker vibrates naturally according to the recorded audio signal,
the flat panel speaker also generates harmonics based on the recorded audio signal. However, in
the flat panel type speaker, since the flat diaphragm is excited by the drive device to self-oscillate,
it is difficult to control the vibration particularly in the low frequency range. In order to
overcome the difficulty, for example, in Patent Document 3, a frame-shaped rising peripheral wall
is formed on the outer peripheral portion of the flat diaphragm to cope with the low sound range.
Further, in Patent Document 4, a coupling member is attached to a portion where the vibration of
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the flat diaphragm vibrates as much as possible, thereby suppressing runaway of the diaphragm
to achieve adaptation to a low frequency range.
[0005]
On the other hand, the inventors have developed an automatic violin technology that is excited
by a speech signal and disclosed the technology (Patent Documents 5 and 6). This automatic
violin excites a violin piece with an audio signal and vibrates the entire instrument through the
vibration of the piece, thereby automatically playing the instrument through the same process as
when a person plays a string with a bow. The automatic violin not only generates sound waves in
the audible range recorded when excited by the audio signal of the music CD of the standard
specification, but also creates harmonics based on the audio signal in the audible range recorded.
Naturally, this new harmonic includes high frequency sound waves in a band beyond the audible
range. Therefore, even when a music CD whose band of 20 kHz or more is cut is used as a sound
source, a harmonic sound of a frequency of 20 kHz or more is produced with the recorded audio
signal of 20 kHz or less as a basic sound. By this action, playing an automatic violin with audio
signals of a commercial music CD creates high frequency overtones that are discarded in the
music CD and superimposes them on the reproduced sound waves of the audio signals contained
in the music CD. You can listen to extremely realistic sounds as if you were in contact with FIG.
14B shows a pair frequency power spectrum of sound waves emitted by an automatic violin
driven by an audio signal of 440 Hz. At a glance at this figure, it will be appreciated that for the
supplied 440 Hz audio signal, the automatic violin emits not only the corresponding 440 Hz
acoustic wave but also harmonics based on 440 Hz. The overtones in the band above 20 kHz are
the sounds that were not recorded, and were the sounds created by the self-oscillation of the
automatic violin.
[0006]
However, although this automatic violin is suitable for the reproduction of violin music, the
reproduction of general audio signals has the following problems. (1) The tone of the violin is
superimposed on the reproduced sound. For this reason, when the sound source signal other
than the violin is reproduced, the timbre is mixed although it is slight. (2) The violin-type musical
instrument has many elements that require constant maintenance and adjustment, such as
strings and pieces, and it has not always been simple for general users to handle as a speaker. (3)
Since the violin musical instrument to be applied generates a better reproduced sound as the
musical instrument is more valuable, the cost as a speaker is not necessarily suitable for general
widespread use.
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[0007]
WO 97/09842 Patent No. 3763848 Patent No. 4447676 Japanese Patent Laid-Open No. 2010199818 Patent No. 4776465 Utility Model No. 3159576
[0008]
Patent Office "patent application technology trend research report in 2006, focusing on the latest
speaker technology-focusing on small speakers-(abstract version)" May 2007 Patent Office
"patent search guidebook-small speaker technology-" Heisei 20 March C. M.
Hatchins "Sounds of the Violin", Nikkei Science, December 1981 Carlene M. Hutchins "Sounds of
the violin", Journal of the Acoustical Society of Japan, Vol. 39, No. 3, pp. 204-213, 1983 T.
Oohashi et al, "Inaudible high-frequency sounds affect brain activity: Hypersonic effect", Journal
of Neurophysiology, vol. .83, pp. 3548-3558, 2000
[0009]
The problem to be solved is to create a highly realistic reproduced music by creating an overtone
outside the audible band lost in the music CD and superimposing it on the reproduced sound
wave of the audible range basic sound signal. It is to provide a speaker.
[0010]
In order to solve the above-mentioned subject, inventors newly devised the pronunciation device
provided with the composition based on the sound theory of a violin musical instrument.
As shown in FIG. 12, the violin-type musical instrument joins the entire peripheral edge of the
front and back two plates with a side plate and bonds a long rod-like hardwood to the inner
surface of the front plate just under the left foot of the piece and further directly below the right
foot of the piece A soul pillar is erected on the inner surface of a nearby front plate and
connected to the inner surface of the back plate, and an opening called an F-shaped hole is
provided between a piece of the front plate and the peripheral edge. Above all, the acoustic
characteristics of the left half region of the surface plate are shifted more to the low frequency
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side than the right half region without power wood due to hardwood bonding, so the vibration of
the bass string in contact with the left half top of the piece is received smoothly And vibrate. On
the other hand, the right half region of the front plate smoothly receives the vibration of the
high-pitched string in contact with the right half top of the piece and vibrates, and transmits the
vibration to the back plate via the soul column in the vicinity immediately below. Because the
back plate is a hard material, it produces high-pitched sound by high-frequency vibration, but
also responds to low-frequency vibration if the bass string is strongly pushed. You can make the
sounding bass reach long distances. As described above, in the violin-type musical instrument,
since the front and back plates connected by the side plates and the soul column do not only
mutually restrain each other but also interact with each other, the free vibration of one panel is
generated. The basic principle of the flat panel speaker is completely different from the principle
of sound generation. The top and back plates of violin instruments are very carefully designed to
exhibit mutual suppression, synergy and complementarity depending on the frequency and
energy of vibration, and they have a bass range like flat panel speakers. Of course there is no
runaway at all. The present invention proposes a new sounding device based on the basic
configuration of this violin-type musical instrument.
[0011]
The overtone speaker according to claim 1 of the present invention is a posture in which the first
panel and the second panel face each other by the rod-shaped sound post or the plurality of rodshaped sound posts, and the first panel of the oblong shape and the second panel similar to the
first panel. And the frame is fixed to the entire periphery of the first panel, and the rod-like bus
bar is placed on one side of the inner surface of the first panel divided by the upper and lower
bisectors along the first panel major axis. In a configuration in which a drive unit having a
member that vibrates in response to an audio signal is fixed to the outer surface or the inner
surface of the first panel, the member vibrating in response to the audio signal of the drive
device The forced vibration of the first panel causes the vibration of the first panel to be
transmitted to the second panel through the sound post and the second panel to perform split
resonance at the same time as the first panel is sounded. With sound wave generated in
accordance with, and superimposed on the sound waves, characterized by generating the
overtones was fundamental tone audio signal. In the harmonic speaker according to claim 2 of
the present invention, in the harmonic speaker according to claim 1, the driving device is fixed to
the first panel by the both-side fixing jig, and the vibrating member of the driving device is the
both-side fixing jig In the configuration in which the first panel is forcedly vibrated via the fixing
device, the fixing jig at one side (for example, the upper side) of the drive device is at a position
near the bus bar and the fixing jig for the other side (for example, lower side) is near the sound
post. In the position, the drive device is fixed to the first panel in a posture in which the drive
device floats from the first panel surface. In the harmonic speaker according to claim 3 of the
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present invention, in the harmonic speaker according to claim 1 or claim 2, an opening is
provided through the front and back in the region between the drive device and the immediate
peripheral portion. It is characterized by The harmonic speaker according to claim 4 of the
present invention is the harmonic speaker according to claim 1, claim 2 or claim 3, wherein the
frame comprises a vertical frame and a horizontal frame, and a vertical frame The lateral frames
are both curved outward, and the first panel is fixed so that the central portion protrudes
outward. The harmonic speaker according to claim 5 of the present invention is the harmonic
speaker according to any of claim 1, claim 2, claim 3, or claim 4, wherein the first panel is a
region between fixing jigs on both sides. In the above, the present invention is characterized in
that the front and back penetrations are provided. According to a sixth aspect of the present
invention, in the harmonic speaker according to any of the first aspect, the second aspect, the
third aspect, the fourth aspect, or the fifth aspect, the second panel includes a fixing member. It is
characterized in that it is fixedly or elastically coupled to the frame.
According to a seventh aspect of the present invention, in the harmonic speaker according to the
seventh aspect of the present invention, the entire peripheral edge of the horizontally elongated
panel is fixed to the frame, and both sides of the drive device are fixed at the positions where the
two side fixing jigs straddle the upper bisector Fix the rod in a posture floating from the surface
of the panel via a jig, fix a rod-like bus bar on the back of the drive unit near the fixed jig
mounting position in a posture parallel to the long axis of the panel, and penetrate the panel
front and back It is characterized in that the panel is provided with an opening portion to be
inserted, and a cut portion which passes through the front and back between the fixing jigs on
both sides of the drive device.
[0012]
In the harmonic speaker according to the present invention, the horizontally-shaped first panel
and the second panel similar to the first panel are coupled to each other by the rod-shaped sound
post in a posture in which the first and second panels face each other. The frame is fixed to the
entire peripheral edge of the first panel, and the rod-like bus bar is placed on one side of the
inner surface of the first panel divided by upper and lower bisectors along the first panel major
axis. In a configuration in which the drive unit including a member vibrating in response to the
audio signal is fixed to the outer surface or the inner surface of the first panel, the vibrating
member of the drive unit corresponding to the audio signal is the first panel Vibration of the first
panel is transmitted to the second panel through the sound post, and the second panel performs
divided resonance to respond to the audio signal. While generating sound waves, by
superimposing on the sound wave, the advantage of generating the overtones was fundamental
tone audio signal.
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[0013]
FIG. 1 is a diagram schematically illustrating the configuration of a harmonic speaker 1
according to a first embodiment of the present invention.
FIG. 2 is a view schematically illustrating the front view configuration of the same overtone
speaker 1. FIG. 3 is a diagram schematically illustrating the configuration of the inner surface of
the first panel provided in the same overtone speaker 1. FIG. 4 is a diagram schematically
illustrating an internal configuration of a drive device provided in the same overtone speaker 1.
FIG. 5 is a diagram schematically illustrating the configuration of the inner surface of the first
panel provided in the harmonic sound speaker 2 according to the second embodiment of the
present invention. FIG. 6 is a diagram schematically illustrating the configuration of the harmonic
overtone speaker 3 according to the third embodiment of the present invention. FIG. 7 is a view
schematically illustrating the front view configuration of the same overtone speaker 3. FIG. 8 is a
diagram schematically illustrating the configuration of the inner surface of the first panel
provided in the harmonic speaker 4 according to the fourth embodiment of the present
invention. FIG. 9 is a diagram schematically illustrating the configuration of the inner surface of
the first panel provided in the harmonic sound speaker 5 according to the fifth embodiment of
the present invention. FIG. 10 is a diagram schematically illustrating the configuration of the
harmonic overtone speaker 6 according to the sixth embodiment of the present invention. FIG.
11 is a diagram schematically illustrating the configuration of the harmonics speaker 7 according
to the seventh embodiment of the present invention. FIG. 12 is a diagram for explaining the
configuration of a violin. FIG. 13 is a diagram showing a pair frequency power spectrum of a
sound wave driven and emitted by a 440 Hz voice signal, where A is a power spectrum of a
sound wave emitted by the harmonic speaker 1 of the present invention, and B is from the
harmonic sound speaker 1 of the present invention. It is a power spectrum of the sound wave
which the 1st panel emitted when the 2nd panel was removed and it was set as only the 1st
panel. (Example 1) FIG. 14 is a diagram showing a pair frequency power spectrum of a sound
wave driven and emitted by an audio signal of 440 Hz, where A is a power spectrum of a sound
wave emitted by a commercially available dynamic speaker, and B is an automatic violin Power
spectrum of the sound wave.
[0014]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings. FIG. 12 is a front view (A) and a cross-sectional view (B) of the violin. The violin smells
the strings by a bow and vibrates, and the vibrations are transmitted to the surface plate through
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the pieces set on the surface plate. The piece has an acoustically unique shape, and is inserted
and fixed between the string and the surface plate by the tension of the string to bring the two
legs into contact with the surface plate. On the inner surface of the front plate, a wooden rod-like
body called a power bar (bus bar) is bonded and fixed along the longitudinal direction in the
vicinity immediately below one foot of the piece (left foot in the figure). In the vicinity of the
other foot of the piece (right foot in the figure), a wooden column called a soul post (sound post)
stands between the inner surface of the back plate immediately below. The soul post plays a role
in transmitting the vibration of the front plate to the back plate. The vibration of the piece is
transmitted to the top plate through the two legs. In the upper part of the left foot, there are Glines for bass and D-lines for mid-bass if it is a violin. In the upper part of the right foot, there is
an A-line for middle and high-pitched sound and an E-line for high-pitched sound. The entire
peripheral edge of the top plate and the back plate is connected and fixed to each other by side
plates connected to surround the periphery. That is, in the case of a violin, the peripheral edge
portions of the front and back plates constitute a restraining end of vibration by being fixed to
each other. Thus, in the violin-type musical instrument, two diaphragms are fixed to each other
so as to exert mutual suppression, synergy and complementation. The sound generation
mechanism is fundamentally different from a flat panel type speaker whose peripheral portion is
basically a free end, based on the division vibration. When the bass string is played, the bass
string vibrates, and low frequency vibration is transmitted to the front plate through the pieces.
Since the rim of the top plate is connected to the back plate and a hardwood is fixed near the
bottom of the piece left foot on the inner surface of the top plate, the top plate does not run away
even with strong low frequency vibration, and low frequency vibration becomes smooth. It
spreads over the whole surface plate. Also, part of it is transmitted to the back plate through the
soul column, causing the back plate to vibrate. The vibration of the back plate due to the low
frequency vibration is transmitted to the back plate at a large ratio of its energy, especially when
the bass string is repelled by a strong force, and the hard back plate rang strongly. However,
when the response is not so strong, the surface plate made of a relatively soft spruce vibrates and
is generated by low frequency vibration. When the middle-high-pitched string is played, the
middle-high-pitched string vibrates, and vibrations of the middle-high frequency range are
transmitted to the front plate through the pieces. The vibration of the top plate is transmitted to
the back plate via a soul post erected in the vicinity of immediately below the piece right foot on
the inner surface of the top plate.
The backing is a very stiff maple that usually emits medium-high and high-pitched sounds. In
particular, high-pitched sound (long reach) is realized by the vibration of the back plate. Highquality violin sound waves reach every corner of a large hole. This performance is mainly due to
the material and construction of the back plate which is hard and crystallized. The violin does not
break as much as the player plays with force, and it never causes vibrational runaway in the bass
band as seen with a panel-type speaker. This difference is due to the superior composition of
violin instruments. The inventors refer to the relationship between the configuration and
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function of such a violin, and came to develop an entirely new sound producing device
technology.
[0015]
FIG. 1 is a plan view schematically illustrating the configuration of the harmonic speaker 1
according to an embodiment of the present invention, in which A is a view showing a rear view, B
is a transverse sectional view, and C is a longitudinal sectional view. . In FIG. 1, the driving device
11 is fixed to the outer surface of the first panel 10 fixed to the frame 12, and drives and vibrates
the first panel 10 according to the audio signal.
[0016]
The frame body 12 is a rigid body for fixing the first panel 10, and the rear surface thereof is a
curved surface in which the central portion in the vertical and horizontal directions frontwards
and protrudes outward (FIGS. 1B and 1C).
[0017]
The first panel 10 has a basic shape having different lengths in the vertical and horizontal
directions, and is fixed to the rear surface of the frame 12 so that the central portion is curved
and protrudes outward in both the vertical and horizontal directions. It is held (FIG. 1B, FIG. 1C).
As materials of the first panel 10, members of various materials are applied according to the type
of audio signal to be reproduced. The material and the tissue configuration are not limited to a
specific range. That is, it may be a member having a structure formed by sandwiching the core
material of the heterogeneous structure with the skin material, a foam member, a wood having a
homogeneous structure, a synthetic fiber material, or the like. The curved plate of the violin in
which the central portion protrudes has its own divided vibration different from that of the flat
panel (Non-Patent Document 3), and the resonance mode is further changed by the peripheral
edge being restrained.
[0018]
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The drive device 11 is fixed to the rear surface (outer surface) of the first panel 10 (FIG. 1). The
first panel 10 is provided with openings 13 and 14 penetrating the inner and outer surfaces
inside the upper and lower end sides along the longitudinal direction of the first panel 10 so as to
sandwich the fixed drive device 11 (FIG. 1).
[0019]
The first panel 10 has a central portion curved outward in a curved shape and fixed to the frame
12 and is provided with openings 13 and 14 penetrating therethrough, and the driving device 11
is fixed between the openings 13 and 14 (FIG. 1A, FIG. 1B). In the harmonic speaker 1 according
to the embodiment of the present invention, the penetrating openings are formed in pairs of 13
and 14. However, the number and shape of the openings depend on the type of audio signal to
be reproduced. It is preferable to change, and it is not limited to the number and shape shown in
this figure.
[0020]
The driving device 11 is fixed in a posture in which the bottom surface of the housing of the
driving device 11 is not in intimate contact with the surface of the first panel 10 via fixing jigs 15
and 16 provided on both sides. In this embodiment, as shown in FIG. 1, the drive device 11 is
fixed to the first panel 10 via the upper and lower two fixing jigs 15 and 16. The driving device
11 fixes the housing of the driving device 11 at a position where the fixing jigs 15 and 16 on
both sides straddle the upper and lower bisectors of the panel. This is because, by connecting the
fixing jigs 15 or 16 on the respective sides to either the upper or lower half area of the first panel
10, a vibration corresponding to each vibration characteristic is induced. For this reason, the
number of fixing jigs is not a primary problem, and generally, it is important that the both-side
fixing jigs of the drive device be respectively connected to the half area of the panel.
[0021]
FIG. 3 is a diagram schematically illustrating the configuration of the inner surface of the first
panel provided in the harmonic speaker 1 according to this embodiment. In FIG. 3, the rodshaped bus bar 17 is fixed at the inner surface position of the first panel 10 near the position
immediately below the fixing position of the upper fixing jig 15. The bar-shaped bus bar 17 is a
rigid rod-like body extending along the longitudinal direction of the first panel 10, and is shaped
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so as to be in intimate contact with the inner surface of the curved first panel 10 and in intimate
contact with the inner surface of the first panel 10. It is fixed. By fixing the bar-shaped bus bar
17, the natural vibration of the upper half region of the first panel 10 in FIG. 3 is shifted more to
the bass side. As a result, the natural vibration of the lower half region of the first panel 10
remains relatively higher on the treble side. Further, the bar-shaped bus bar 17 has the function
of canceling out the runaway of the first panel 10 in the low frequency range. On the other hand,
the lower half region of the first panel 10 can not receive the bar-shaped bus bar 17 at all, and
even if the lower frequency vibration than the natural vibration is generated, the main energy is
the upper half There is no runaway because it is guided to the area.
[0022]
In the harmonic speaker 1 according to the embodiment of the present invention, a rod-like
sound post 18 is fixed on the inner surface of the drive device 11 fixed to the first panel 10 and
in the vicinity of the lower right fixing jig 16 (FIG. 3). ). The rod-like sound post 18 is a vibration
transmitting member made of a rigid body, one end of which is fixed to the inner surface of the
first panel 10 and the other end is fixed substantially vertically to the inner surface of the second
panel 19 (see FIG. 2) Be done. The end fixed to the inner surface of the first panel 10 is shaped to
conform to the inner surface of the curved first panel 10 so that the vibration of the first panel
10 is transmitted smoothly.
[0023]
Next, the second panel 19 will be described with reference to FIG. FIG. 2 is a diagram
schematically illustrating the front view configuration of the harmonic speaker 1 according to
this embodiment, and the first panel 10 fixed to the frame 12 and the rod-like sound post 18 are
used in the first panel 10. The connected second panel 19 is shown. The outer edge portion of
the second panel 19 is basically a free end, but, as will be described later with reference to other
embodiments of the present invention, even if certain constraints are applied depending on the
type of audio signal to be reproduced. Good.
[0024]
In the harmonic overtone speaker 1 according to the embodiment of the present invention,
although the material of the basically uniform tissue is used as the second panel 19, it is also
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possible to use the material of the inhomogeneous tissue. The outer shape of the second panel 19
is technically preferable to be similar to the first panel 10 in terms of acoustic characteristics, but
shapes other than the similar shape are not particularly disadvantageous.
[0025]
The role of the second panel 19 in the harmonic speaker 1 of this embodiment is, first of all, the
action of suppressing the runaway of the first panel 10 in the bass band by its mass. However,
the second and more important role is the sound generation by the vibration of the second panel
19 itself. The vibration driven by the driving device 11 (FIG. 1) is transmitted to the first panel 10
via the upper and lower two fixing jigs 15 and 16. Since the bar-shaped bus bar 17 is fixed to the
inner surface of the first panel 10 in the vicinity immediately below the upper fixing jig 15, the
vibration pattern of the vibration region in this vicinity is more responsive to the low frequency
region than in the other regions. The quality is improved. Therefore, the low frequency vibration
can be more smoothly transmitted to the first panel 10 through the upper fixing jig 15, and the
first panel 10 can sound more over the low tone range.
[0026]
Further, since the first panel 10 is only deployed in the vicinity immediately below the lower
fixing jig 16, the first panel 10 vibrates under the restraint by the frame 12 against the vibration
of the drive device 11. The vibration is transmitted to the second panel 19 through the rod-like
sound post 18 fixed in the vicinity immediately below. The second panel 19 is driven by the rodlike sound post 18 to perform split resonance since its peripheral edge basically has a free end
property. That is, harmonics are generated with the drive sound signal as a basic sound. Its
harmonic generation effect is of course better than the harmonic generation effect of the first
panel 10 under many mechanical constraints, and in fact, by the frequency-to-frequency power
spectrum data of the sound wave generated in response to the 440 Hz audio signal, The
difference is clearly shown (Figure 13). FIG. 13 is a power spectrum showing the operation of the
second panel 19. That is, A is the power spectrum of the sound wave driven by the audio signal
of 440 Hz and emitted by the harmonic speaker 1 of the present invention, and B is driven by the
audio signal of 440 Hz and the harmonic speaker 1 to the second panel 19 of the present
invention. And the power spectrum of the sound wave emitted only by the first panel 10. From
this figure, the role of the second panel 19 in harmonic sound generation is easily understood.
[0027]
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As shown in FIG. 4, an electrodynamic speaker can be used as the drive device 11 for the
harmonic speaker 1 according to this embodiment, which is inserted into the magnetic circuit 40
and the magnetic gap 41 and through the damper 42. Between the circuit 40 and the resiliently
coupled voice coil and bobbin 43, a force corresponding to the electric voice signal is generated,
and the voice coil and bobbin are fixed to both side fixing jigs 15 and 16 of the drive device. By
being fixedly connected, the magnetic circuit having a relatively larger mass than the voice coil
and the bobbin vibrates to forcibly vibrate the first panel through the both-side fixing jig.
However, it is a matter of course that the drive device 11 of the harmonic overtone speaker 1 of
the present invention is not limited to the speaker of this form.
[0028]
Next, a harmonic overtone speaker 2 according to a second embodiment of the present invention
will be described. The first panel of the harmonic speaker 2 has notches 20 penetrating the front
and back of the panel in the region between the upper and lower fixing jigs 15 and 16 of the
drive device as shown in the first panel inner view of FIG. 5 There is.
[0029]
Next, a harmonic overtone speaker 3 according to a third embodiment of the present invention
will be described. In the harmonic speaker 3, the second panel 19 is fixedly or elastically coupled
to the frame 12 by the fixing member 21 (FIG. 6). This coupling can be done by means of a fixing
element 21 with an optimum elasticity count, depending on the type of audio signal to be
reproduced. Although the second panel 19 is fixed at four corners of the frame 12 in FIG. 6, the
second panel 19 may be fixed so as to surround the entire peripheral edge of the second panel
19 or the frame 12 and the second panel by a spring. 19 may be linked. FIG. 7 is a view
schematically illustrating the front view configuration of the harmonic speaker 3 of this
embodiment.
[0030]
Next, a harmonic speaker 4 according to a fourth embodiment of the present invention will be
described with reference to FIG. In the harmonic speaker 4, along the longitudinal direction of
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the first panel 10, the upper and lower end sides are inward so as to sandwich the drive device
(only the position is indicated by a circular dotted line) fixed to the rear surface (outer surface) of
the first panel 10 An S-shaped opening 22, 23 is provided through the inner and outer surfaces.
The action of these openings is equivalent to the f-shaped hole in a violin-type musical
instrument.
[0031]
Next, a harmonic speaker 5 according to a fifth embodiment of the present invention will be
described with reference to FIG. A rod-like sound post 18 is fixed on the inner surface of the first
panel 10 of the harmonic speaker 5 at a position immediately below the lower fixing jig 16 of the
driving device (only the position is indicated by a circular dotted line) fixed to the outer surface.
Furthermore, a plurality of rod-like sound posts 24 and 25 are fixed. The rod-like sound posts 24
and 25 are vibration transmitting members formed of a rigid body, one end of each of which is
fixed to the inner surface of the first panel 10, and the other end thereof is respectively
connected to the second panel inner surface (not shown). It is fixed almost vertically. The rod-like
sound posts 24 and 25 have the function of transmitting the vibration of the first panel 10 to the
second panel 19 in the same manner as the rod-like sound posts 18, but the position where they
are fixed is the sound signal to be reproduced. Determined according to the nature. These also
have the effect of stabilizing the connection between the first panel 10 and the second panel 19
in addition to the vibration transfer function.
[0032]
Next, a harmonic overtone speaker 6 according to a sixth embodiment of the present invention
will be described. The harmonic speaker 6 is a single panel speaker. Depending on the nature of
the audio signal to be reproduced, even a single panel can provide reproduced sound and new
harmonics. As shown in FIG. 10, the harmonic speaker 6 is disposed at a position where the
fixing jigs on both sides of the drive device 61 straddle the upper and lower bisectors of the
panel via two fixing jigs 65 and 66. Fix the rod 60 in a posture in which it floats from the surface
of the panel 60, fix the rod-shaped bus bar 67 on the back surface of the drive device 61 in the
vicinity of one fixing jig attachment position, and provide the openings 63 and 64. The fixing jigs
65 and 66 are provided with notches 68 penetrating through the front and back, and the entire
peripheral edge of the panel 60 is fixed to the frame 62.
[0033]
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Next, a harmonic overtone speaker 7 according to a seventh embodiment of the present
invention will be described. The harmonic speaker 7 is a speaker in which a driving device is
installed. As shown in FIG. 11, the harmonics speaker 7 fixes two housings at a position where
the fixing jigs on both sides straddle the upper and lower bisectors of the panel on the inner
surface of the first panel 70. The rod bar bus bar 77 is fixed on the inner surface in the vicinity of
one fixing jig mounting position of the drive device 71 by fixing it in a posture floating from the
inner surface of the first panel 70 via the jig 75. 76. One end of a rod-like sound post is fixed in a
substantially vertical posture on the inner surface in the vicinity of the fixing jig mounting
position, and the openings 73 and 74 are provided, and further front and back penetration
between two fixing jigs 75 and 76 of the driving device. The entire periphery of the first panel 70
is fixed to the frame 72. Further, by fixing the inner surface of the second panel 80 in a
substantially vertical posture to the other end of the rod-like sound post, the first panel 70 and
the second panel 80 are configured to face each other substantially in parallel. The harmonic
speaker 7 according to this embodiment is the same as the harmonic speaker 1 according to the
first embodiment in elements other than the mounting position and orientation of the drive
device 71, and thus the description of those elements is omitted.
[0034]
When the harmonic speaker 1 according to the first embodiment of the present invention is
summarized as a typical embodiment of the present embodiment, the first harmonic speaker 1 is
acoustically connected by a rod-shaped sound post 18. Since the panel 10 and the second panel
19 have the configuration to vibrate and sound, it is possible to provide the following features
different from the conventional cone type speaker and the flat panel type speaker. (1) The rodshaped bus bar 17 is provided on the inner surface of the first panel 10, so that the first panel 10
can smoothly receive vibrations in the low frequency range mainly through the left fixing jig 15
of the drive device 11. As a result, the runaway problem of the first panel 10 in the low
frequency range is resolved. (2) The runaway of the first panel 10 in the low frequency range is
further caused by part of the vibration energy being transmitted to the second panel 19 through
the rod-shaped sound post 18 and being consumed by the vibration of the second panel 19 ,
Resolved. The synergistic and complementary action of the first panel 10 and the second panel
19 is similar to the interaction on the front and back plates of the violin musical instrument. (3)
In the medium vibration energy range, the second panel 19 receives the vibration of the lower
half area of the first panel 10 via the lower fixing jig 16 of the drive device 11 and mainly
responds to the middle to high tone vibration. It is pronounced, but in the higher vibration
energy range, it can vibrate correspondingly to lower frequency vibration and generates a sound
wave with a strength. This function of the second panel 19 is, in acoustic theory, equivalent to
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the function of the back plate of a violin-type musical instrument (analog). (4) The second panel
19 is particularly effective for generating a new harmonic overtone that is based on the original
sound, since the peripheral edge is basically a free end. (5) The harmonics speaker as this
embodiment propagates the sound wave to non-directionality in vibration theory, and therefore
does not require an enclosure like a cone-shaped speaker. Therefore, all side effect problems
such as phase shift generated based on the enclosure could be avoided. (6) The sound wave
propagation by the harmonic speaker according to this embodiment is omnidirectional in theory
of vibration, so the stereo sense audio range is extremely wide at the time of stereo sound signal
reproduction. (7) Since the existing speaker can be applied as the drive device 11, the
conventional product can be applied to the source reproduction device and the amplifier as they
are. (8) The harmonics speaker as this embodiment not only generates a sound wave
corresponding to the signal of the frequency band included in the supplied audio signal, but also
creates harmonics based on the supplied audio signal. Do.
Therefore, even when using a sound source in which the recording band is limited and the high
tone range is cut, a high-reality sound (reproduction sound + harmonic tone) that can be heard
live performance by generating an overtone simultaneously with the original sound I can hear it.
[0035]
FIG. 13A is a versus frequency power spectrum of a sound wave generated by the present
invention harmonic speaker of Example 1 for an input of a 440 Hz audio signal. It can be seen
that the speaker generates a harmonic over the fundamental sound of 440 Hz. These overtones
are all sounds created by the inventive overtone speaker of the first embodiment. FIG. 13B is a
frequency power spectrum of a sound wave emitted by the first panel when the second panel is
removed from the harmonic multiple speaker of the present invention of Example 1 to make only
the first panel. In comparison with FIG. 13A, the harmonic generation effect of the second panel
can be clearly understood in the present invention harmonic speaker of Example 1. In these
spectrum acquisitions, 440 Hz sound was generated from a PC by a SpeakerCheck tool (music
research institute), amplified by an amplifier (type Qriom SP-250, Yamazen), and input to the
present invention overtone speaker of Example 1. Further, sound waves generated by the
harmonic overtone speaker of the present invention of Example 1 were recorded by a voice
recorder (type S-20M, OLYMPUS), and a frequency power spectrum was obtained by FFT
analysis software (wavespectra).
[0036]
A rod-shaped bus bar is provided on one side of the first panel fixed to the frame to expand the
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correspondence to the low frequency band audio signal, and the other side area without the rodshaped bus bar of the first panel and the second panel The high fidelity reproduction and audio
signal of the audio signal including the bass range by fixedly connecting the panels through the
rod-like sound post so that the panels are in the facing posture and simultaneously driving the
first panel and vibrating the second panel. It is applicable to the application of the harmonic
sound creation which makes a fundamental sound.
[0037]
1 harmonic speaker 1 10 1st panel 11 drive 12 frame 13 opening 14 opening 15 drive upper
fixing jig 16 drive lower fixing jig 17 bar bar 18 bar bar sound post 19 second panel
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