JP2013090093A - Harmonic loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a harmonic loudspeaker capable of generating a harmonic based upon a sound source audio signal as a fundamental tone while reproducing the sound source audio signal.SOLUTION: There is provided the harmonic loudspeaker capable of generating harmonics based upon the sound source audio signal as the fundamental tone while reproducing the sound source audio signal by causing a first and a second panel to vibrate by areas through a configuration in which acoustic characteristics of a rod-shaped bus bar fixation-side area of the first panel are expanded into a lower-frequency band by fixing the first panel to a frame body and a rod-shaped bus bar to a one-side area of the first panel, and the other-side area of the first panel without the rod-shaped bus bar is fixedly coupled to the second panel through a rod-shaped sound post.

Description

  The present invention relates to a harmonic speaker technology that superimposes harmonics generated based on a digitally recorded audio signal on sound waves generated mainly by reproducing a digitally recorded audio signal.

In digital music recording technology, the frequency component of the audio signal contained in the sound source is limited to a certain range by the sampling frequency and the cut-off frequency. A large number of stereo enthusiasts who existed in the record era have been drastically reduced.
Since the recording band of the music CD was determined based on the human audible range, approximately 20 kHz or more was discarded in the high frequency band.
However, in the American Physiological Society journal, when the sound waves outside the audible range are superimposed on the sound waves in the audible range, the alpha waves in the occipital region and the local blood flow in the brainstem and thalamus increase, making the listener feel happy. A report based on a brain physiological experiment has been made (Non-patent Document 5).

As an audio signal reproducing apparatus, an electrodynamic conversion type apparatus provided with a cone-shaped diaphragm has been generally put into practical use as a dynamic speaker for many years, particularly in a small speaker.
A dynamic speaker equipped 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 a music CD was played, it was recorded on the music CD. Only sounds in the frequency band are generated, and other sounds are naturally not generated.
FIG. 14A shows a 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 can be understood that the dynamic speaker faithfully emits only 440 Hz sound waves with respect to the supplied 440 Hz audio signal.

On the other hand, since the 1980s, speaker technology using a flat panel as a diaphragm has been proposed (Patent Documents 1 and 2).
The flat panel type speaker technology is completely different from the cone type speaker in that sound waves are generated by the division resonance of the flat diaphragm itself. The inventors have noted that when a flat panel type speaker vibrates naturally in response to a recorded audio signal, it also generates overtones based on the recorded audio signal.
However, in a flat panel type speaker, the planar diaphragm is excited by the driving device and self-vibrates, so that it is difficult to control the vibration particularly in the low frequency range. In order to overcome this 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 place where the vibration of the flat diaphragm is large, and the runaway of the diaphragm is suppressed to adapt to the low sound range.

On the other hand, the inventors have developed an automatic violin technology that is excited by an audio signal and published the technology (Patent Documents 5 and 6). This automatic violin automatically plays a musical instrument through a process similar to that when a person plays a string with a bow by exciting a violin piece with an audio signal and vibrating the whole instrument through the vibration of the piece.
An automatic violin not only generates sound waves in a recorded audible range when excited by a sound signal of a standard music CD, but also creates overtones based on the recorded audible range sound signals. Naturally, this new overtone includes high frequency sound waves in a band beyond the audible range. Therefore, even when a music CD from which a band of 20 kHz or higher is cut is used as a sound source, overtones having a frequency of 20 kHz or higher are generated using a recorded audio signal of 20 kHz or lower as a fundamental tone.
Due to this action, when an automatic violin is played with a sound signal of a commercially available music CD, a high-frequency overtone discarded in the music CD is created and superimposed on the reproduced sound wave of the sound signal contained in the music CD. You can listen to a very realistic sound as if you were touching the performance.
FIG. 14B shows the power spectrum versus frequency of sound waves emitted by an automatic violin driven by a 440 Hz audio signal. At first glance, it can be understood that the automatic violin emits not only the corresponding 440 Hz sound wave but also the overtone based on 440 Hz for the supplied 440 Hz sound signal.
Overtones in a band of 20 kHz or higher are sounds that have not been recorded, and are created by self-vibration of an automatic violin.

However, this automatic violin is most suitable for the reproduction of violin music, but there are the following problems in the reproduction of general audio signals.
(1) Violin tone 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) Violin musical instruments have many members that require constant maintenance and adjustment, including strings and pieces, and are not always simple for general users to handle as speakers.
(3) Since the violin musical instrument to be applied has a higher value as a musical instrument and produces a better reproduced sound, the cost as a speaker is not necessarily suitable for general spread.

WO 97/09842 Japanese Patent No. 3763848 Patent No. 44447676 JP 2010-199818 A Japanese Patent No. 4776465 Utility model No. 3159576

Patent Office “Patent Application Technology Trend Survey Report 2006: Latest Speaker Technology-Focusing on Small Speakers (Summary)” May 2007 JPO "Patent Search Guidebook -Small Speaker Technology-" March 2008 C. M.M. Hutchins "Violin Acoustics", Nikkei Science, December 1981 Carleen M. Hutchins "Acoustics of the Violin", Journal of the Acoustical Society of Japan, Vol. 39, No. 3, pages 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

  The problem to be solved is to create harmonics outside the audible band lost in the music CD and superimpose it on the reproduced sound wave of the audible fundamental signal, thereby creating reproduced music with a high degree of reality. Is to provide speakers.

In order to solve the above-mentioned problems, the inventors have newly devised a sound generation device having a configuration based on the acoustic theory of a violin musical instrument.
As shown in Fig. 12, the violin musical instruments are connected to the entire periphery of the two front and back plates with a side plate, and a long bar-shaped force tree is bonded to the inner surface of the front plate near the lower left foot of the piece. It has a structure in which a soul pillar is raised on the inner surface of the front plate in the vicinity and connected to the inner surface of the back plate, and an opening called an f-shaped hole is provided between the front plate piece and the periphery.
In particular, the acoustic characteristics of the left half area of the front plate are shifted to the lower frequency range than the right half area where there is no power tree due to the adhesion of force wood, so that the vibration of the bass string in contact with the top left half of the piece is smoothly received. Then vibrate. On the other hand, the right half area of the front plate smoothly receives the vibration of the treble string in contact with the top right half of the piece, and transmits the vibration to the back plate through the soul pillar in the immediate vicinity.
Because the back plate is a hard material, it produces high-frequency sound by high-frequency vibration. However, if the low-pitched string is played strongly, it also supports low-frequency vibration. A sounding bass can be transmitted to a long distance.
As described above, the violin musical instruments not only restrain the side plate and the back plate connected by the side plate and the soul column, but also interact with each other. The operating principle of sound generation is completely different from the basic flat panel type speaker. The front and back plates of the violin genus instruments are very skillfully designed to exhibit mutual suppression, synergy and complementary effects according to the frequency and energy of vibration, and the low frequency range is similar to flat panel speakers. Of course, there is no such thing as going out of control.
The present invention proposes a new sounding device based on the basic configuration of the violin musical instrument.

The overtone speaker according to the first aspect of the present invention is a posture in which the first panel and the second panel face each other by a single or a plurality of rod-shaped sound posts, with the horizontally long first panel and the second panel similar to the first panel. The frame is fixed to the entire peripheral edge of the first panel, and the rod-shaped bus bar is formed on one side region of the inner surface of the first panel divided by the upper and lower bisectors along the first panel long axis. In a configuration in which a driving device having a member that is fixed in a posture parallel to the major axis of the first panel and that vibrates according to an audio signal is fixed to the outer surface or the inner surface of the first panel, By forcing the first panel to vibrate, the first panel emits sound, and at the same time, the vibration of the first panel is transmitted to the second panel via the sound post. With sound wave generated in accordance with, and superimposed on the sound waves, characterized by generating the overtones was fundamental tone audio signal.
The harmonic speaker according to claim 2 of the present invention is the harmonic speaker according to claim 1, wherein the driving device is fixed to the first panel by a both-side fixing jig, and the vibrating member of the driving device is a both-side fixing jig. In the configuration in which the first panel is forcibly vibrated, the fixing jig on one side (for example, the upper side) of the driving device is positioned near the bus bar, and the fixing jig on the other side (for example, the lower side) is positioned near the sound post. In the position, both the drive devices are fixed to the first panel so as to float from the first panel surface.
Further, the overtone speaker according to claim 3 of the present invention is the overtone speaker according to any of claim 1 or claim 2, wherein an opening that penetrates the front and back is provided in a region between the driving device and the nearest peripheral edge. It is characterized by that.
The harmonic speaker according to claim 4 of the present invention is the harmonic speaker according to any one of claims 1, 2, or 3, wherein the frame body includes a vertical frame and a horizontal frame, Both horizontal frames have a shape that curves outward, and the first panel is fixed in a shape in which a central portion projects outward.
According to a fifth aspect of the present invention, there is provided the harmonic speaker according to any one of the first, second, third, and fourth aspects, wherein the first panel is a region between both side fixing jigs. In the present invention, it is characterized in that it has a cut portion penetrating the front and back.
The overtone speaker according to claim 6 of the present invention is the overtone speaker according to any one of claims 1, 2, 3, 4, or 5, wherein the second panel is formed by a fixing member. It is characterized by being fixedly or elastically coupled to the frame.
The overtone speaker according to the seventh aspect of the present invention fixes the entire periphery of the horizontally long panel to the frame, and fixes the drive device on both sides at a position where the both-side fixing jig crosses the bisector of the panel. Fix it in a posture that floats from the surface of the panel via a jig, and fix the rod-shaped bus bar to the back of the drive unit in the vicinity of one fixing jig in a posture parallel to the long axis of the panel, and penetrate the front and back of the panel The panel is provided with an opening to be formed and a cut portion penetrating the front and back between both side fixing jigs of the drive device.

  The overtone speaker according to the present invention combines a horizontally long first panel and a second panel similar to the first panel in a posture in which the first panel and the second panel face each other by one or a plurality of rod-shaped sound posts. The long axis of the first panel is fixed to one side region of the inner surface of the first panel divided by the upper and lower bisectors along the first panel long axis, fixing the frame to the entire peripheral edge of the first panel. In a configuration in which a driving device including a member that is fixed in a posture parallel to the sound and vibrates according to an audio signal is fixed to the outer surface or the inner surface of the first panel, the member that vibrates the driving device according to the audio signal is the first panel. When the first panel generates sound, the vibration of the first panel is transmitted to the second panel via the sound post, and the second panel performs split 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.

FIG. 1 is a diagram schematically illustrating the configuration of a harmonic speaker 1 as a first embodiment of the present invention. FIG. 2 is a diagram schematically illustrating a front view configuration of the harmonic overtone speaker 1. FIG. 3 is a diagram schematically illustrating the configuration of the inner surface of the first panel provided in the harmonic overtone speaker 1. FIG. 4 is a diagram schematically illustrating the internal configuration of the drive device provided in the harmonic overtone speaker 1. FIG. 5 is a diagram schematically illustrating the configuration of the inner surface of the first panel included in the overtone speaker 2 according to the second embodiment of the present invention. FIG. 6 is a diagram schematically illustrating the configuration of the overtone speaker 3 according to the third embodiment of the present invention. FIG. 7 is a diagram schematically illustrating a front view configuration of the harmonic overtone speaker 3. FIG. 8 is a diagram schematically illustrating the configuration of the inner surface of the first panel included in the overtone 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 included in the overtone speaker 5 according to the fifth embodiment of the present invention. FIG. 10 is a diagram schematically illustrating the configuration of the overtone speaker 6 according to the sixth embodiment of the present invention. FIG. 11 is a diagram schematically illustrating the configuration of the overtone speaker 7 according to the seventh embodiment of the present invention. FIG. 12 is a diagram for explaining the structure of a violin. FIG. 13 is a diagram showing a power spectrum of a sound wave generated by being driven by a 440 Hz audio signal, where A is a power spectrum of the sound wave emitted by the overtone speaker 1 of the present invention, and B is from the overtone speaker 1 of the present invention. It is the power spectrum of the sound wave which the 1st panel emitted when the 2nd panel was removed and it was only the 1st panel. Example 1 FIG. 14 is a diagram showing a power spectrum of a sound wave driven by a 440 Hz audio signal, A is a power spectrum of a sound wave emitted by a commercially available dynamic speaker, and B is a power spectrum of a sound wave emitted by an automatic violin. It is.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 12 is a front view (A) and a sectional view (B) of the violin. In the violin, a string is struck by a bow to vibrate, and the vibration is transmitted to the front plate through a piece standing on the front plate.
The piece has a shape that is unique in acoustic theory, and is inserted and fixed between the string and the front plate by the tension of the string, and the two feet are brought into contact with the front plate. On the inner surface of the front plate, a wooden rod called a power bar (bus bar) is bonded and fixed in the vertical direction in the vicinity of one leg (left leg in the figure) just below. In addition, a wooden column called a soul column (sound post) is placed between the bottom of the back plate just below the other foot (right foot in the figure). The soul pillar plays a role of transmitting the vibration of the front plate to the back plate.
The vibration of the piece is transmitted to the front plate through two legs. In the upper part of the left foot, if it is a violin, a G line for bass and a D line for middle bass are stretched. Further, an A line for medium and high sounds and an E line for high sounds are stretched on the upper part of the right foot.
All peripheral portions of the front plate and the back plate are connected and fixed to each other by side plates that surround and combine the peripheral portions. That is, in the violin, the peripheral portions of the front plate and the back plate are fixed to each other to constitute a vibration restricting end. In this way, in the violin musical instrument, the two diaphragms are fixed to each other so as to exhibit a mutual inhibition action, a synergistic action, and a complementary action. This sound generation mechanism is fundamentally different from a flat panel type speaker whose peripheral edge is basically a free end, but based on divided vibration.
When the bass string is played, the bass string vibrates, and the vibration in the low frequency range is transmitted to the front plate through the piece. Since the front plate peripheral edge is connected to the back plate, and the power board is fixed near the left foot of the front plate inside, the front plate does not run away even with strong low frequency vibration, and the low frequency vibration is smooth Propagates throughout the front plate. Part of it is transmitted to the back plate through the soul pillar, causing the back plate to vibrate. The vibration of the back plate due to the low frequency vibration is transmitted to the back plate in a large ratio, especially when the bass string is played with a strong force, and the hard back plate vibrates powerfully. However, when the performance is not so strong, the surface plate made of a relatively soft spruce material vibrates and generates sound for low frequency vibration.
When a middle / high pitched string is played, the middle / high pitched string vibrates and vibrations in the middle / high frequency range are transmitted to the front plate through the piece. The vibration of the front plate is transmitted to the back plate via a soul pillar that is set up near the right foot of the piece on the inner surface of the front plate. The back plate is a very hard maple material and usually produces medium and high tones. In particular, high-pitched sound (long reach) is realized by the vibration of the back plate. High quality violin sound waves reach every corner of the large hall. This performance is largely stiff and depends on the material and composition of the backplate where the structure is crystallized.
The violin will not break no matter how hard it is played by the player, and will never cause low-frequency vibration runaway, as seen on panel-type speakers. This difference is largely attributed to the outstanding composition of violin instruments.
The inventors have come up with the development of completely new sounding device technology by referring to the relationship between the structure and function of the violin.

FIG. 1 is a plan view schematically illustrating the configuration of a harmonic speaker 1 as an embodiment of the present invention, in which A is a diagram showing a rear view configuration, 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.

  The frame body 12 is a rigid body for fixing the first panel 10, and its rear surface is a curved surface with front and rear central portions projecting outward (FIGS. 1B and 1C).

The first panel 10 has a basic shape with different vertical and horizontal lengths, and is fixed to the rear surface of the frame body 12 so that the central portion is curved and protrudes outward in both the vertical and horizontal directions. Is retained (FIGS. 1B and 1C).
As the material of the first panel 10, members of various materials are applied according to the type of audio signal to be reproduced. The material and structure of the material are not limited to a specific range. That is, a member having a structure in which both surfaces of a core material having an inhomogeneous structure are sandwiched between skin materials, a foamed member, wood having a homogeneous structure, or a synthetic fiber material can be applied.
The violin curved plate protruding from the center exhibits a unique divided vibration different from that of the flat panel (Non-patent Document 3), and the resonance mode is further changed by restraining the peripheral edge.

  The driving device 11 is fixed to the rear surface (outer surface) of the first panel 10 (FIG. 1). The first panel 10 includes openings 13 and 14 penetrating the inner and outer surfaces on the inner side of the upper and lower ends along the longitudinal direction of the first panel 10 so as to sandwich the fixed driving device 11 (FIG. 1).

The first panel 10 is bent and fixed to the frame body 12 so that the central portion is raised outward, and includes openings 13 and 14 that pass therethrough. The drive 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 two through-holes 13 and 14 are paired. The number and shape of the openings depend on the type of the audio signal to be reproduced. It is preferable to change, and it is not limited to the number and shape shown in this figure.

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 close contact with the surface of the first panel 10 by way of fixing jigs 15 and 16 provided on both sides. In this embodiment, as shown in FIG. 1, the driving device 11 is fixed to the first panel 10 via two upper and lower fixing jigs 15 and 16.
The drive device 11 fixes the housing of the drive device 11 at a position where the fixing jigs 15 and 16 on both sides cross the upper and lower bisectors of the panel. This is because the fixing jig 15 or 16 on each side is connected to either the upper or lower half region of the first panel 10 to induce vibration according to each vibration characteristic.
For this reason, the number of fixing jigs is not a primary problem. In general, it is important that the fixing jigs on both sides of the driving device are respectively connected to the half region of the panel.

FIG. 3 is a diagram schematically illustrating the configuration of the inner surface of the first panel included in the overtone speaker 1 according to this embodiment. In FIG. 3, the rod-shaped bus bar 17 is fixed to the inner surface position of the first panel 10 immediately below the upper fixing jig 15 fixing position. The rod-shaped bus bar 17 is a rigid rod-shaped body that extends along the longitudinal direction of the first panel 10, and is shaped so as to be in close contact with the inner surface of the first panel 10 with a curved shape, and is in close contact with the inner surface of the first panel 10. Fixed.
By fixing the rod-shaped bus bar 17, the natural vibration of the upper half region of the first panel 10 in FIG. 3 is shifted to the lower sound side. As a result, the natural vibration in the lower half region of the first panel 10 stays on the higher sound side relatively. Further, the rod-shaped bus bar 17 has an action of canceling the runaway of the first panel 10 in the low sound range.
On the other hand, the lower half region of the first panel 10 has its main energy in the upper half even when vibrations having a frequency lower than the natural vibration are generated, which cannot be accepted without the bar-shaped bus bar 17 at all. Because you are guided to the area, you will not run away.

  In the overtone speaker 1 as an embodiment of the present invention, a rod-like sound post 18 is fixed to the inner surface of the drive device 11 fixed to the first panel 10 on the inner surface of the lower fixing jig 16 (see FIG. 3). ). The rod-shaped sound post 18 is a vibration transmission 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). Is done. The end fixed to the inner surface of the first panel 10 is formed in a shape that fits the inner surface of the curved first panel 10 so that the vibration of the first panel 10 is smoothly transmitted.

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 overtone speaker 1 of this embodiment. The first panel 10 fixed to the frame 12 and the rod-shaped sound post 18 are attached to the first panel 10. A 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, it may be restricted depending on the type of audio signal to be reproduced. Good.

  In the overtone speaker 1 according to the embodiment of the present invention, the second panel 19 is basically made of a material having a uniform structure, but a material having a non-homogeneous structure can also be used. The outer shape of the second panel 19 is technically preferable in terms of acoustic characteristics and similar to that of the first panel 10, but a shape other than the similar shape is not particularly inconvenient.

The role of the second panel 19 in the overtone speaker 1 of this embodiment is firstly the function of suppressing the runaway of the first panel 10 in the bass band by its mass. However, the second and more important role is sound generation by 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 rod-shaped bus bar 17 is fixed to the inner surface of the first panel 10 immediately below the upper fixing jig 15, the vibration pattern of the vibration region in the vicinity corresponds to a lower sound region than other regions. Improved. Therefore, the low frequency vibration is more smoothly transmitted to the first panel 10 via the upper fixing jig 15, and the first panel 10 can generate sound over a lower sound range.

Further, since the first panel 10 is just unfolded near the lower fixing jig 16, the first panel 10 vibrates under the restraint by the frame body 12 against the vibration of the driving device 11. The vibration is transmitted to the second panel 19 through a rod-like sound post 18 fixed in the vicinity of the bottom.
Since the peripheral part of the second panel 19 basically has a free end property, the second panel 19 is driven by the rod-shaped sound post 18 to perform split resonance. That is, overtones are generated using the drive sound signal as a fundamental tone. The overtone generation effect is naturally superior to the overtone generation effect of the first panel 10 under many mechanical constraints, and in fact, the sound frequency versus frequency power spectrum data generated according to the 440 Hz audio signal, The difference is clearly shown (FIG. 13).
FIG. 13 is a power spectrum showing the operation of the second panel 19. That is, A is a power spectrum of a sound wave that is driven by a 440 Hz audio signal and emitted from the harmonic speaker 1 of the present invention, and B is driven by a 440 Hz audio signal and is transmitted from the harmonic speaker 1 of the present invention to the second panel 19. Is a power spectrum of a sound wave emitted only by the first panel 10. From this figure, the role of the second panel 19 in overtone creation can be easily understood.

As the driving device 11 of the harmonic overtone speaker 1 as this embodiment, as shown in FIG. 4, an electrodynamic type speaker can be used, and is inserted into the magnetic circuit 40 and the magnetic gap 41 and magnetically passed through the damper 42. Between the circuit 40 and the voice coil / bobbin 43 elastically connected, a force corresponding to the electric audio signal is generated, and the voice coil / bobbin is applied to both side fixing jigs 15 and 16 of the driving device. Due to the fixed connection, the magnetic circuit having a relatively larger mass than the voice coil / bobbin vibrates, and the first panel is forcibly vibrated via the both-side fixing jig.
However, it goes without saying that the drive device 11 for the harmonic speaker 1 of the present invention is not limited to this type of speaker.

  Next, a harmonic speaker 2 as a second embodiment of the present invention will be described. The first panel of the overtone speaker 2 includes a notch 20 penetrating the front and back of the panel in the region between the upper and lower fixing jigs 15 and 16 of the driving device, as shown in the inner surface of the first panel in FIG. Yes.

Next, an overtone speaker 3 as a third embodiment of the present invention will be described. In the overtone speaker 3, the second panel 19 is fixedly or elastically coupled to the frame body 12 by a fixing member 21 (FIG. 6). This coupling can be performed by the fixing member 21 having an optimal elastic coefficient according to the type of the audio signal to be reproduced. In FIG. 6, the second panel 19 is fixed at the four corners of the frame 12. However, the second panel 19 may be fixed so as to surround the entire peripheral edge of the second panel 19, and the frame 12 and the second panel may be fixed by a spring. 19 may be connected.
FIG. 7 is a diagram schematically illustrating the front view configuration of the overtone speaker 3 of this embodiment.

Next, a harmonic speaker 4 as a fourth embodiment of the present invention will be described with reference to FIG. In the harmonic speaker 4, inside the upper and lower ends along the longitudinal direction of the first panel 10 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. S-shaped openings 22 and 23 penetrating the inner and outer surfaces are provided.
The action of these openings corresponds to an f-shaped hole in a violin musical instrument.

Next, a harmonic speaker 5 as a fifth embodiment of the present invention will be described with reference to FIG. On the inner surface of the first panel 10 of the harmonic speaker 5, a rod-like sound post 18 is fixed to the inner surface of the lower fixing jig 16 of the driving device (only the position is indicated by a circular dotted line) fixed to the outer surface. Further, a plurality of rod-like sound posts 24 and 25 are fixed. The rod-shaped sound posts 24 and 25 are vibration transmission members made of a rigid body, each having one end fixed to the inner surface of the first panel 10 and each other end being connected to the inner surface of the second panel (not shown). Fixed almost vertically.
The rod-like sound posts 24 and 25 have a function of transmitting the vibration of the first panel 10 to the second panel 19 in the same manner as the rod-like sound post 18, but the position where they are fixed is the position of the audio signal to be reproduced. Decide according to the nature. These have the effect of stabilizing the connection between the first panel 10 and the second panel 19 in addition to the vibration transmission function.

Next, a harmonic speaker 6 as a sixth embodiment of the present invention will be described. The harmonic speaker 6 is a single panel type speaker. Depending on the nature of the audio signal to be reproduced, it is possible to obtain a reproduced sound and a new overtone even with a single panel.
As shown in FIG. 10, the overtone speaker 6 is placed on the housing of the driving device 61 through two fixing jigs 65.66 at positions where the fixing jigs on both sides cross the upper and lower bisectors of the panel. It fixes with the attitude | position which floated from the surface of the panel 60, the rod-shaped bus-bar 67 is fixed to the back surface vicinity of one fixing jig attachment position of the drive device 61, it has the opening parts 63 and 64, and also two drive devices are provided. A notch portion 68 penetrating front and back is provided between the fixing jigs 65 and 66, and the entire peripheral edge portion of the panel 60 is fixed to the frame body 62.

Next, a harmonic speaker 7 as a seventh embodiment of the present invention will be described. The overtone speaker 7 is a speaker with a built-in driving device.
As shown in FIG. 11, the overtone speaker 7 has two housings fixed to the inner surface of the first panel 70 at the position where the fixing jigs on both sides cross the upper and lower bisectors of the panel. It fixes with the attitude | position which floated from the inner surface of the 1st panel 70 via the jig | tool 75.76, the rod-shaped bus-bar 77 is fixed to the inner surface of one fixing jig attachment position vicinity of the drive device 71, and the other side of the drive device 71 One end of a rod-shaped sound post is fixed in an almost vertical position on the inner surface near the fixing jig mounting position, and has openings 73 and 74. Further, the front and back penetrates between two fixing jigs 75.76 of the driving device. A notch 79 is provided, and the entire peripheral edge of the first panel 70 is fixed to the frame 72.
In addition, the other end of the rod-shaped sound post is configured such that the first panel 70 and the second panel 80 face each other substantially in parallel by fixing the inner surface of the second panel 80 in a substantially vertical posture.
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 / posture of the driving device 71, and thus description of those elements is omitted.

As described above, the harmonic overtone speaker 1 according to the first embodiment is summarized as a representative form of this embodiment. The overtone speaker 1 is acoustically coupled by a rod-shaped sound post 18. Since the panel 10 and the second panel 19 are configured to vibrate and generate sound, the following features that are different from the conventional cone type speaker and the flat panel type speaker can be provided.
(1) Since the rod-shaped bus bar 17 is provided on the inner surface of the first panel 10, the first panel 10 can smoothly receive lower-frequency vibration mainly through the left fixing jig 15 of the driving device 11. Thus, the runaway problem of the first panel 10 in the low sound range has been solved.
(2) The runaway of the first panel 10 in the low sound range is further caused when a part of the vibration energy is transmitted to the second panel 19 via the rod-shaped sound post 18 and consumed for vibration of the second panel 19. Solved. The synergistic and complementary action of the first panel 10 and the second panel 19 is the same as the interaction between the front and back plates of the violin instrument.
(3) In the middle vibration energy range, the second panel 19 receives the vibration of the lower half region of the first panel 10 via the lower fixing jig 16 of the driving device 11 and mainly responds to the middle / high range vibration. Although it is pronounced, in a higher vibration energy range, it can vibrate corresponding to lower-frequency vibrations, and generates a sound wave with bottom force. This function of the second panel 19 is equivalent (analogous) to the function of the back plate of a violin musical instrument in acoustic theory.
(4) The second panel 19 is particularly effective in generating new overtones based on the original sound because the peripheral edge portion is basically a free end.
(5) Since the harmonic overtone speaker as this embodiment propagates a sound wave in an omnidirectional manner in terms of vibration theory, it does not require an enclosure like a cone type speaker. Therefore, it was possible to avoid all side effects such as phase shifts that occur based on the enclosure.
(6) Propagation of sound waves by the harmonic speaker according to this embodiment is omnidirectional in terms of vibration theory, and therefore has a very wide audible range for stereo sense when reproducing stereo audio signals.
(7) Since an existing speaker can be used as the driving device 11, conventional products can be applied to the source reproduction device and the amplifier as they are.
(8) The harmonic speaker according to this embodiment generates not only a sound wave corresponding to a signal in a frequency band included in the supplied audio signal, but also generates a harmonic based on the supplied audio signal. To do. Therefore, even when using a sound source with a limited recording band and a cut off high-frequency range, it generates harmonics at the same time as the original sound, thereby producing a highly realistic sound (playing sound + overtone) that can be heard directly from the live performance. I can hear you.

FIG. 13A shows a frequency power spectrum of sound waves generated by the harmonic overtone speaker of the first embodiment when an audio signal of 440 Hz is input. It can be seen that the speaker generates overtones with respect to the fundamental tone of 440 Hz. These overtones are all sounds created by the overtone speaker of the present invention in Example 1.
Moreover, FIG. 13B is a versus frequency power spectrum of the sound wave emitted from the first panel when the second panel is removed from the overtone speaker of the present invention of Example 1 and only the first panel is used. By comparison with FIG. 13A, in the harmonic speaker of the present invention of Example 1, the harmonic creation effect of the second panel can be clearly understood.
In addition, for these spectrum collections, a 440 Hz sound was generated from a PC by a SpeakerCheck tool (Music Laboratory), amplified by an amplifier (type QriomSP-250, Yamazen), and input to the overtone speaker of the present invention of Example 1. The sound waves generated by the harmonic overtone speaker of the first embodiment were recorded with a voice recorder (type S-20M, Olympus), and the anti-frequency power spectrum was obtained by FFT analysis software (wavespectra).

  A bar-shaped bus bar is provided on one side of the first panel fixed to the frame to expand the compatibility with low frequency band audio signals, and the other side area of the first panel without the bar-shaped bus bar and the second panel are High-fidelity reproduction of audio signals including low frequencies and audio signals by connecting the panels fixedly via a rod-shaped sound post so that the panels face each other and driving the first panel and simultaneously vibrating the second panel It can be applied to the purpose of creating harmonic overtones.

1 Overtone speaker 1
DESCRIPTION OF SYMBOLS 10 1st panel 11 drive device 12 frame 13 opening 14 opening 15 drive device upper fixing jig 16 drive device lower fixing jig 17 rod-shaped bus bar 18 rod-shaped sound post 19 second panel

Claims (7)

A horizontally long first panel and a second panel similar in shape to the first panel are joined together in a posture in which the first panel and the second panel face each other by a single or a plurality of rod-shaped sound posts, and the entire periphery of the first panel The frame is fixed to the part, and the rod-shaped bus bar is fixed to one side area of the inner surface of the first panel divided by the upper and lower bisectors along the first panel major axis in a posture parallel to the major axis of the first panel. In the configuration in which the driving device including a member that vibrates according to the audio signal is fixed to the outer surface or the inner surface of the first panel,
The member that vibrates in response to the audio signal of the driving device forcibly vibrates the first panel, so that the first panel generates sound, and at the same time, the vibration of the first panel is transmitted to the second panel via the sound post, When the panel performs split resonance,
A harmonic overtone speaker characterized by generating a sound wave corresponding to an audio signal and generating a harmonic overlaid on the sound wave to generate a harmonic overtone based on the audio signal.   In the configuration in which the driving device is fixed to the first panel by a both-side fixing jig, and the vibrating member of the driving device forcibly vibrates the first panel through the both-side fixing jig, one side (for example, the upper side) of the driving device ) At the position near the bus bar, and the other side (for example, the lower side) fixing jig at the position near the sound post, the drive device is lifted from the first panel surface to the first panel. The overtone speaker according to claim 1, which is fixed.   The harmonic speaker according to claim 1 or 2, wherein the first panel includes an opening that penetrates the front and back in a region between the driving device and the nearest peripheral edge.   The frame body is composed of a vertical frame and a horizontal frame. The vertical frame and the horizontal frame both have a shape that curves outward, and the first panel is fixed in a shape in which a central portion projects outward. The harmonic speaker according to claim 1, claim 2, or claim 3.   The overtone according to claim 1, claim 2, claim 3, or claim 4, wherein the first panel includes a notch that penetrates the front and back surfaces in a region between the fixing jigs on both sides. speaker.   The second panel is fixedly or elastically coupled to the frame body by a fixing member. The claim 1, claim 2, claim 3, claim 4, or claim 5 The listed harmonic speaker.   The entire periphery of the horizontally long panel is fixed to the frame, and the drive device is lifted from the surface of the panel via the both-side fixing jig at the position where the both-side fixing jig crosses the upper and lower bisectors of the panel. Fix it in a posture, fix the rod-shaped bus bar in the posture parallel to the long axis of the panel on the back surface near the mounting position of one fixing jig of the driving device, and fix the both sides of the driving device on both sides A harmonic overtone speaker characterized in that the panel is provided with a notch that penetrates between the front and back surfaces.

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