JP2008175866A - Musical sound device and method of manufacturing musical sound device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To successfully transmit vibration/sound of a soundboard to the other side and gradely generate sound as a whole musical sound device by connecting the soundboard and the other side of the musical sound device with a connection body. <P>SOLUTION: A straight connecting rod 16 is caught between the center of an inside surface of a soundboard 11 and an inside surface of a front face board 6 on the opposite side of the soundboard 11 for connecting both inside surfaces. Vibration/sound of the soundboard 11 is smoothly transmitted to the front face board 6 by the connecting rod 16, and musical sound is generated from the whole musical sound device. A signal of all frequency band ranges is sent to an electromagnetic drive unit 14 and the soundboard 11 is vibrated with the all frequency band ranges so as to measure frequency characteristics of the soundboard 11. The musical sound signal of the frequency in protruding part with large level of them is sent to the electromagnetic drive unit 14, and a position of the connecting rod 16 connected to the soundboard 11 is changed in order. The position where the level of frequency characteristic in the protruding part with large level becomes small is searched, and the searched position is decided to be the position to which the connecting rod 16 is connected. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a musical sound device, and more particularly, to a device that vibrates a soundboard of a musical instrument and generates and emits a sound from the soundboard.

  Conventionally, in order to vibrate such a soundboard (diaphragm), an electromagnetic drive is joined to the piano soundboard, and a musical sound signal is sent to the electromagnetic drive to vibrate the soundboard instead of the electromagnetic drive. The sound is emitted and emitted from this soundboard.

Japanese Utility Model Publication No. 60-150894 JP-A-8-146949 JP-A-8-111896 JP-A-4-156799 JP-A-53-69624 JP-A-4-56996 Japanese Patent Laid-Open No. 5-80748 Japanese Patent Laid-Open No. 5-73039 Japanese Patent Application No. 2006-181135 (unpublished) Japanese Patent Application No. 2006-160054 (unpublished) Japanese Patent Application No. 2006-151287 (unpublished) Japanese Patent Application No. 2006-141954 (unpublished) Japanese Patent Application No. 2006-135899 (unpublished)

  However, when the sound is produced with such a soundboard (vibration plate), the sound is slightly different from the sound of an actual acoustic instrument.

  In order to achieve the above object, the present invention provides a sound board for a plate-like musical instrument that oscillates and emits sound, and converts a musical sound signal composed of a plurality of types of musical sounds into a mechanical change to obtain a sound board for the musical instrument. And a transducer that radiates sound by driving the inner surface of the soundboard, and an elongated coupling body that is attached between the inner surface of the soundboard and the inner surface of a surface different from that of the soundboard.

  The present invention also includes a step of measuring the frequency characteristics of the soundboard before the connection body is attached, and the soundboard at the frequency of the concave portion or the convex portion of the measured frequency characteristics with unevenness. The step of measuring the frequency characteristics by vibrating and the position where the connecting body abuts the soundboard is switched to increase the frequency characteristic level of the concave portion or decrease the frequency characteristic level of the convex portion. A step of searching for a position, and a step of setting the searched position to a position where the connected body is connected.

  As a result, the vibration / sound of the soundboard is often transmitted to a different surface from the soundboard, and the sound is also improved from the surface different from the soundboard. In addition, the vibration of the soundboard will not resonate, and the musical sound emitted from the soundboard will not be inadvertently mutated, making it possible to approximate the sound of an actual acoustic instrument.

  In addition, the frequency characteristics of the soundboard become flat, and even if the frequency / pitch of the sound output from the soundboard changes, the volume does not change inadvertently and is uniform over the entire frequency / pitch. The volume characteristic can be achieved.

  In the present specification, the resonance means an abnormal resonance that gives a variation to the musical sound generated from the musical sound device. Unlike the resonance, the sound board 11, the front plate 6, and the bottom plate 2 of the musical sound device. In each part such as the contact frame 3, the lower right inner plate 4, the lower left inner plate 5, the middle top plate 7, resonance is allowed positively or passively.

(1) Musical Device FIG. 1 is a rear view of the musical device, FIG. 2 is a front view of the musical device, and FIGS. 3, 4 and 5 are longitudinal and transverse sections of the musical device. A pair of long wooden feet 1 and 1 of the musical sound device are arranged parallel to each other in the horizontal direction. A bottom plate 2 made of wood or the like is fixed with a wood screw, a bolt, an adhesive or the like so as to bridge between the feet 1 and 1.

  The bottom plate 2 has an elongated rectangular shape arranged horizontally, and a contact frame 3 such as a square-shaped wood is fixed to the rear edge in the vertical direction with a wood screw, a bolt, an adhesive, or the like. A right side plate 4 and a left side plate 5 made of wood or the like are attached to the left and right ends of the bottom plate 2 and the left and right edge surfaces of the rectangular contact frame 3 with wood screws, bolts, adhesive, or the like.

  A front plate 6 made of wood or the like is attached to the front edge of the bottom plate 2, the lower right inner plate 4 and the lower inner plate 5 with wood screws, bolts, adhesive, or the like. The vertical edges of the lower right inner plate 4, the lower inner plate 5, the front plate 6 and the upper edge of the contact frame 3 are the same height. 7 is attached with wood screws, bolts or adhesive.

  The rear surface of the abutment frame 3 (including the back surface, the same applies hereinafter), the front surface of the edge of the soundboard 11 made of wood or the like with an intervening band 8 having flexibility, elasticity, and / or cushioning properties in between. Is abutted. Since the outer edge of the soundboard 11 is smaller than or slightly smaller than the outer edge of the contact frame 3, the soundboard 11 is the main body of the musical instrument, that is, the bottom plate 2, the contact frame 3, the lower right inner plate 4, the lower inner plate 5, and the front. It will be in the state which does not contact the face plate 6 and the center top plate 7 at all. Therefore, the sound / vibration of the soundboard 11 is not directly transmitted to the music apparatus main body, and the music sound emitted from the soundboard 11 is not inadvertently changed or the volume is not reduced.

  The sound board 11 is fixed to the contact frame 3 by pressing it with a wood screw 23 or the like. In this case, the thickness of the intervening band 8 is compressed from 0% to 90%. Therefore, there is no gap between the intervening band 8, the contact frame 3, and the soundboard 11. As a result, the intervening body, the contact body, and the soundboard do not collide with each other by vibration, and abnormal vibration / abnormal sound is not generated, and the musical sound emitted from the soundboard 11 is inadvertently generated. It will no longer mutate or decrease volume.

  The intervening band 8 is interposed in the entire periphery of the soundboard 11 and the contact frame 3 without a gap. Also, the sound device main body to which the soundboard 11 is attached, the side / rear side, the upper side, the lower side, the right side, the left side, that is, the bottom plate 2, the contact frame 3, the lower right inner plate 4, the lower inner side. The plate 5, the front plate 6, and the middle top plate 7 are sealed without a gap.

  Therefore, the sound board 11 is sealed without a gap between the entire peripheral edge of the sound board 11 in front of the top, bottom, left and right and the musical instrument main body, that is, the contact frame 3. As a result, no sound leaks from the surroundings of the soundboard 11, and the musical sound emitted from the soundboard 11 is not inadvertently changed or the volume is not reduced.

  When sound leaks from around the soundboard 11, the leaked sound is radiated from the inside of the soundboard 11, and the phase of the sound wave from the outside of the soundboard 11 is reversed. If the sound leaks from the surroundings, the sound from the outer surface of the soundboard 11 is canceled, but such a seal prevents this cancellation, and the musical sound emitted from the soundboard 11 is inadvertently changed or the volume is reduced. Will not be lost.

  The front plate 6 is low in height and the upper edge is notched to form a gap between the top plate 7 and an insertion hole 9 extending in the horizontal direction. Four pillars are erected and divided into three insertion holes 9, which are covered with a mesh-like cloth. This insertion hole 9 is located on the opposite side to the side on which the sound board 11 is attached of the musical sound device main body to which the sound board 11 is attached.

  Thereby, sound from the soundboard 11 is radiated from the insertion hole 9. The sound from the insertion hole 9 is radiated from the inside of the soundboard 11, and the phase of the sound from the outside of the soundboard 11 is inverted, but the sound from the insertion hole 9 is the outer surface of the soundboard 11. Are not radiated in the same direction as the outer surface of the soundboard 11, so that these sounds do not cancel each other or adversely affect each other, and the musical sound emitted from the soundboard 11 is inadvertent It will no longer mutate or decrease volume.

  A mechanism box 21 is installed on the middle top plate 7. A keyboard 22 and a panel switch group are attached to the front surface of the mechanism box 21. A right outer plate 24 and a left outer plate 25 are joined to the left and right side surfaces of the mechanism box 21 and the outer sides of the lower right inner plate 4 and the lower left inner plate 5. The mechanism box 21 contains a tone control circuit, a filter, an amplifier, a speaker, and the like for generating a tone signal corresponding to the operation of the keyboard 22 and the panel switch group.

  Therefore, the musical tone device is a keyboard instrument, and the sound board 11 is attached to the rear side / rear side of the musical instrument of the keyboard musical instrument, and below the keyboard 22 on the front side of the musical instrument. The insertion hole 9 is formed. As a result, sound radiated from the insertion hole 9 (including vibrations, and the same applies hereinafter) is also transmitted to the keyboard 22 and the like, and feels like a real acoustic instrument such as a grand piano or an upright piano. Obtainable.

(2) Soundboard 11 (back sound emitting body)
3 and 5 show a longitudinal section of the musical sound device. A wooden soundboard 11 (back sound emitting body) of a musical instrument that radiates and emits sound has a rectangular flat plate shape, and the outer edge of the soundboard 11 is smaller than or slightly smaller than the outer edge of the contact frame 3. On the rear surface side of the outer peripheral edge of the soundboard 11, frame bars 12 such as four sides of wood are fixed with wood screws, bolts, an adhesive, or the like. As a result, the sound of the soundboard 11 is smoothly transmitted to the four corners of the soundboard 11 and spreads uniformly throughout the soundboard, and the musical sound emitted from the soundboard 11 may be changed inadvertently or the volume may be reduced. Disappear.

  Two to eight, preferably three to seven, more preferably four to six, and even more preferably five wooden sounding bars 13... It is fixed with agents. As a result, the sound of the soundboard 11 is not biased to a part of the soundboard 11 and spreads uniformly throughout the soundboard, and the musical sound emitted from the soundboard 11 may be changed inadvertently or the volume may be reduced. Disappear.

  The sound bars 13 are inclined at 20 to 70 degrees, preferably 30 to 60 degrees, more preferably 40 to 50 degrees with respect to the horizontal direction. As a result, the sound of the soundboard 11 spreads uniformly throughout the sound without being biased in the horizontal direction and / or vertical direction, and the musical sound emitted from the soundboard 11 is inadvertently changed or the volume is reduced. Disappears. Since the soundboard 11 has a rectangular shape, the sound of the soundboard 11 has a property of being originally biased in the horizontal direction and / or the vertical direction.

  The soundboard 11 has a grid, and the grid is aligned in an oblique direction. The sound bars 13 are arranged in a direction substantially perpendicular to the meshes. Thereby, although the sound of the soundboard 11 is easy to propagate along the grid, the sound is propagated across the grid by each soundbar 13... The musical sound emitted from the soundboard 11 will not be inadvertently changed or the volume will be reduced.

  Both end edges of the sound bars 13 reach the frame bars 12. As a result, the sound of the soundboard 11 described above can be achieved up to the edge of the soundboard 11 so that the sound of the soundboard 11 is not biased in the horizontal direction and / or the vertical direction. The volume will not decrease. The sound bars 13 are thin at both ends. As a result, resonance of the soundbar 13 itself is prevented, and the musical sound emitted from the soundboard 11 is not changed inadvertently or the volume is not reduced.

  The intervals between the sound bars 13 are 10 cm to 30 cm, and are not equal intervals but unequal intervals. As a result, the sounding bar 13 becomes a vibration node, so that the sound of the same frequency is not resonated between the sounding bars 13, and the musical sound emitted from the sounding board 11 is inadvertently mutated. The volume will not decrease. Such sounding bars 13 may be attached to the front side other than the rear side of the sounding board 11.

  The interval between the sounding bars 13 becomes wider toward the left side of the musical sound device, that is, toward the right side of FIG. Further, the size of the triangle at the lower right corner of the soundboard 11 in FIG. 1 is larger than the size of the triangle at the upper left corner of the soundboard 11 in FIG. As a result, as the sound board 11 is moved to the right, more bass sounds having lower pitches are radiated.

  The keyboard 22 instructs the output of a plurality of musical tones having different pitches from the high range to the low range. The lower the pitch of the keyboard 22 is as it goes to the left in FIG. 2 and to the right in FIG. The low tone of the tone is output. Thereby, more bass sounds are radiated from the soundboard 11 portion close to the side where the operation of outputting the bass sounds of the keyboard 22 is performed. Therefore, an operation feeling close to that of an acoustic instrument such as an actual piano can be obtained.

  In an actual acoustic instrument such as a piano, the vibration of a musical tone being generated is directly transmitted to the keyboard 22 itself being operated. When the low frequency range of the keyboard 22 is operated, the low frequency vibration is transmitted to the low frequency range key. When the high frequency range of the keyboard 22 is operated, the high frequency range of the high frequency range key is increased. When the middle range of the keyboard 22 is operated, the middle tone is transmitted to the midrange key. The same applies to stringed instruments, wind instruments, and percussion instruments. This musical sound device can provide such a live performance feeling of an acoustic instrument.

  Further, as described above, since the intervals between the sounding bars 13 are non-uniform, the tone generated from the sounding board 11 portions of the sounding bars 13... The musical sound emitted from the soundboard 11 is not inadvertently mutated or the volume is reduced, so that the musical sound of an actual acoustic instrument can be brought close to.

  The sound board 11 has a vertical: horizontal ratio of “1: 2.5”, but “1: 0.25 to 5”, preferably “1: 0.5 to 4”, and more preferably “1: 1”. Thru 3 ”, and more desirably“ 1: 2 thru 2.5 ”. The interval between the sounding bars 13 is “1 to 3 times” the diameter of the electromagnetic drive unit 14, preferably “1 to 2 times”, more preferably “1 to 1.5 times”, and more preferably “1 to 1. “3 times”, more preferably “1 to 1.2 times”, and even more preferably “1 to 1.1 times”. When the number of sounding bars 13 increases, the sound volume generated by the sounding board 11 decreases, but conversely, when the number of sounding bars 13 decreases, the sound quality of the sounding board 11 improves.

(3) Method of mounting the sounding bar 13 The mounting position of the sounding bar 13 to the sounding board 11 is determined as follows. First, the frequency characteristics of the sound board 11 before the sound bars 13 are attached are measured. In this case, in a state where the sound board 11 is attached to the musical sound device, the electromagnetic drive unit 14 attached to the sound board 11 is supplied with various frequency / pitch music signals, all frequency bands / pitch music signals. Alternatively, a white noise signal is sent to vibrate the soundboard 11 in the entire frequency band.

  The vibration / sound of the soundboard 11 is picked up by a microphone, and the picked up sound is analyzed by a frequency band analyzer (known) to measure the frequency characteristics of the soundboard 11. Such frequency characteristics are as shown in FIG. 9, for example. In the frequency characteristics shown in FIG. 9, there is usually no flatness, and there are irregularities with different levels, and there can be convex portions with a high level and concave portions with a low level.

  Among them, a musical tone signal obtained by synthesizing a center frequency of a convex portion having a high level or a plurality of frequencies only in the vicinity of the convex portion is sent to the electromagnetic drive unit 14, and in this state, the sound bar 13 contacts the sound board 11. The position / mounting position is sequentially switched. As a result, the level of the frequency characteristic of the convex portion having a large level increases or decreases.

  Here, a search is made for a position where the level of the frequency characteristic of the convex portion having a large level becomes small so that the frequency characteristic of FIG. 9 becomes flat as shown in FIG. The position to be attached / abutted is determined, and the attachment position of the sounding bar 13 is determined.

  Further, a musical tone signal obtained by synthesizing the center frequency of the concave portion with a small level or a plurality of frequencies only in the vicinity of the concave portion is sent to the electromagnetic drive unit 14, and in this state, the contact position of the sounding rod 13 with the sounding plate 11 / Change the mounting position sequentially. As a result, the level of the frequency characteristic corresponding to the concave portion having a small level increases or decreases.

  Here, a position where the level of the frequency characteristic of the concave portion having the small level becomes large is searched so that the frequency characteristic of FIG. 9 becomes flat as shown in FIG. The position to be attached / abutted is determined, and the attachment position of the sounding bar 13 is determined.

  Such steps are sequentially repeated, and the attachment positions of the plurality of sounding bars 13 are sequentially determined. If the mounting position of the sounding bar 13 is determined in this way and the sounding bar 13 and the sounding board 11 and the musical sound device are produced without changing the material and dimensions of the sounding sound bars 13 and the sounding board 11, These are the same flatly corrected / corrected frequency characteristics.

(4) Electromagnetic drive unit (conversion body / electromagnetic drive body / rear sound emitting body) 14
1 and 4 show the attachment position of the electromagnetic drive unit 14 to the soundboard 11. An electromagnetic drive unit (conversion body / electromagnetic drive body / rear sound emitting body) 14 is attached to the front surface (upper / front surface) of the sound board 11 between the sound bars 13. This attachment mechanism is shown in Japanese Patent Application No. 2006-181135, Japanese Patent Application No. 2006-160054, Japanese Patent Application No. 2006-151287, Japanese Patent Application No. 2006-141954, Japanese Patent Application No. 2006-135899, and the like.

  The outer shape of the electromagnetic drive unit 14 is composed of a cylindrical main body case and a circular flat diaphragm provided on the side surface of the main body case. The electromagnetic drive unit 14 includes a coil and a magnet, and the coil is connected to one of the main body case and the diaphragm and the magnet is connected to the other.

  When a musical sound signal comprising a plurality of types of musical sounds flows through the coil, the coil or magnet vibrates / drives / displaces due to the interaction between the magnetic field generated in the coil and the magnetic field of the magnet, and the vibration plate vibrates / Drive / displace. The diaphragm is joined (including attachment / connection / adhesion) to the soundboard 11 directly or via a connection member. Therefore, the electromagnetic drive unit 14 converts a musical sound signal composed of a plurality of types of musical sounds into mechanical changes, and drives the soundboard 11 of the musical instrument to emit sound.

  Thereby, the diaphragm and the soundboard 11 can be vibrated by electromagnetic driving. Unlike the speaker, the electromagnetic drive unit 11 does not sound / sound itself, but vibrates and emits sound / sound by electromagnetically driving another joined object. Such an electromagnetic drive unit 11 is disclosed in Japanese Patent Laid-Open Nos. 8-146949 and 8-111896.

  The electromagnetic drive unit 14 mainly emits low frequencies as described above. The electromagnetic drive unit 14 is attached to the inner surface at a position slightly shifted to the upper right from the center of the sound board 11 in FIG. 1, on the side opposite to the sound bar 13. The electromagnetic drive unit 14 is attached to the soundboard 11.

  Thereby, a bass is output and radiated from a position shifted from the center of the soundboard 11 to the right in FIG. Thereby, more bass sounds are radiated from the soundboard 11 portion close to the side where the operation of outputting the bass sounds of the keyboard 22 is performed. Therefore, an operation feeling close to that of an acoustic instrument such as an actual piano can be obtained.

  Further, since the electromagnetic drive unit 14 is mounted at a position shifted from the center of the soundboard 11 to the upper side in FIG. 1, a low sound is output and radiated from slightly above the soundboard 11, and an acoustic such as an actual piano is obtained. A sounding state close to that of a musical instrument can be obtained. This is because, in an actual grand piano or upright piano, a string is arranged near the center, not below the musical instrument, and sound is emitted from the vicinity of the center.

  In addition, since the electromagnetic drive unit 14 is mounted at a position shifted from the center of the soundboard 11, the vibration of the soundboard 11 does not resonate and the musical sound emitted from the soundboard 11 is inadvertent. It won't be mutated or decrease in volume, making it closer to the sound of an actual acoustic instrument.

  The electromagnetic drive unit 14 is attached between the sounding bars 13. Thus, after the soundboard 11 is vibrated by the electromagnetic drive unit 14, the vibration of the soundboard 11 is transmitted to the entire soundboard 11 through the soundbars 13... Is not transmitted, and the sound can be transmitted uniformly to the entire soundboard 11.

  Of the two sounding bars 13, 13 sandwiching the electromagnetic drive unit 14, the sounding unit 13 is attached at a position slightly closer to the upper sounding bar 13. As a result, the vibration of the soundboard 11 part between the two sounding bars 13 and 13 does not resonate, and the musical sound emitted from the soundboard 11 part is inadvertently changed or the volume is reduced. It can be made close to the sound of an actual acoustic instrument.

  Since this electromagnetic drive unit 14 is mounted at a position shifted from the center of the sound board 11 upward in FIG. 1, it is mounted at a position close to the insertion hole 9 above the front plate 6 in front of the musical sound device. It will be. Thereby, the sound / musical sound radiated from the insertion hole 9 becomes larger. The electromagnetic drive unit 14 may be attached at a position facing the insertion hole 9.

(5) Upper speaker 31L, 31R, 32L, 32R (upper sound emitting body)
FIG. 7 shows the top surface of the musical sound device. A flat music stand 36 is attached to the upper surface of the musical sound device in the vicinity of the keyboard 22 so that it can be tilted or raised on the upper surface of the musical sound device. The length of the music stand 36 is approximately half of the width of the top surface of the musical sound device, and the height of the music stand 36 is substantially the same as the height of the mechanism box 21 or slightly smaller than the depth of the upper surface of the musical sound device. When the music stand 36 is erected, the music stand 36 is slightly inclined to the back / rear.

  There are four holes in the mechanism box 21 on the back side of the upper surface of the musical sound device, and four upper surface speakers (upper surface sound emitting bodies) 31L, 31R, 32L, 32R are arranged in a line and attached upward. Yes. Of the four upper surface speakers 31L, 31R, 32L, and 32R, the inner two 31L and 31R are located behind the music stand 36 and inside the left and right edges of the music stand 36. The two outside 32L and 32R are located behind the music stand 36 and outside the left and right edges of the music stand 36 and on the side of the music stand 36.

  Therefore, the sound from the inner two 31L, 31R of the four upper surface speakers 31L, 31R, 32L, 32R is reflected by the standing music stand 36 and radiated mainly to the back side / rearward, and the four upper surfaces Of the speakers 31L, 31R, 32L, and 32R, the sound from the outer two 32L and 32R is mainly emitted upward regardless of the standing music stand 36. As a result, sound is radiated and diffused behind and above the musical sound device, and a realistic performance can be realized.

  In addition, a plurality of channel signals for forming a sound image are respectively sent to the inner two 31L and 31R among the four upper surface speakers 31L, 31R, 32L and 32R, so that the sound images are generated by the inner two 31L and 31R. A plurality of channel signals for forming a sound image are also sent to the outer two 32L and 32R, respectively, so that a sound image is formed by the outer two 32L and 32R, A sound image is formed in the upper part, and a realistic performance can be realized.

  The four upper surface speakers 31L, 31R, 32L, and 32R receive musical tone signals in the same frequency band. Therefore, sound images in the same frequency band are formed behind and above the musical sound device, and a realistic performance can be realized. However, the tone signals of different frequency bands may be sent between the inner two 31L and 31R and the outer two 32L and 32R. As a result, sound images in different frequency bands are formed behind and above the musical sound device, and a realistic performance can be realized.

  Note that the number of the top speakers 31L, 31R, 32L, and 32R may be increased. In this case, the number of upper surface speakers 31L and 31R on the back side / back of the music stand 31 may be increased, or the number of upper surface speakers 32L and 32R on the side portion of the music stand 32 may be increased. Further, any one or both of the top speakers 31L, 31R, 32L, and 32R may be omitted.

  Further, the upper speakers 31L, 31R, 32L, 32R may be provided in front of the music stand 36, or may be provided on the front side or the rear side / back side of the musical sound device. The top speakers 31L, 31R, 32L, 32R may be tweeters. The speaker is a concept including a tweeter.

(6) Front tweeter 33L, 33R (front sound emitting body)
Two holes are formed in the mechanism box 21 on the front surface of the musical sound device, and the two front tweeters 33L and 33R are attached to each other in the forward and backward directions. A plurality of channel signals for forming a sound image are respectively sent to the two front tweeters 33L and 33R. Therefore, a sound image is formed in front of the musical sound device by the two front tweeters 33L and 33R, and there is a sense of presence. A performance can be realized.

  The front tweeters 33L and 33R are located further outside than the outer upper surface speakers 32L and 32R. Therefore, the sound image formed by the front tweeters 33L and 33R is formed more distant from the musical sound device than the sound image formed by the upper speakers 31L, 31R, 32L and 32R, and is perpendicular to the musical sound device. The expansion of the sound image is achieved in the horizontal direction.

  The frequency band of the musical sound signal sent to the front tweeters 33L and 33R is higher than the frequency band of the musical sound signal sent to the four upper surface speakers 31L, 31R, 32L and 32R. As a result, sound images in different frequency bands are formed in front and above / backward of the musical sound device, and a realistic performance can be realized. Moreover, since the frequency band of the sound varies depending on the radiation direction, the sound / pitch that can be heard varies depending on the direction from the musical sound device, and a performance with diffusivity and presence can be realized.

  The front tweeters 33L and 33R may be located further inside than the outer top speakers 31L, 31R, 32L and 32R or the top speakers 31L and 31R. Further, the number of front tweeters 33L and 33R may be increased. Further, the front tweeters 33L and 33R may be omitted. The front tweeters 33L and 33R may be speakers.

  A step is formed in front of the upper surface speakers 31L, 31R, 32L, and 32R, and a heat radiating net 37 is attached to a vertical surface of the step portion of the mechanism box 21. Heat from the musical tone control circuit (drive circuit), filter, amplifier, upper surface speakers 31L, 31R, 32L, 32R, and front tweeters 33L, 33R in the mechanism box 21 is radiated from the heat dissipation network 37.

(7) Connecting rod 16 (connected body)
Between the inner surface center of the soundboard 11 and the inner surface of the front plate 6 on the opposite side of the soundboard 11, a straight connecting rod 16 that connects both inner surfaces is sandwiched. The connecting rod 16 is fixed to the inner surface of the soundboard 11 and the inner surface of the front plate 6 with an adhesive, wood screws, bolts, or the like, or is sandwiched between the soundboard 11 and the front plate 6.

  The connecting rod 16 is made of the same material as or different from the sounding rod 13 and is made of wood, metal, resin, etc., and has an elongated square column shape. This connecting rod 16 causes the vibration / sound of the soundboard 11 to be smoothly transmitted to the front panel 6, and the front panel 6 vibrates so as to cancel or obstruct the vibration / sound of the soundboard 11. This prevents the musical sound generated from the entire musical sound device from being inadvertently mutated and the volume from being reduced.

  Since the center of the soundboard 11 is deviated from the center of the front plate 6, even if the connecting rod 16 is attached to the center of the soundboard 11 or the center of the front plate 6, the soundboard 11 and the front plate 6 resonate. In other words, the musical sound generated from the entire musical sound device is not inadvertently changed or the volume is not reduced.

  Such a connecting rod 16 is shifted from the center of the sound board 11 to the center of the front panel 6 and from the center of the sound board 11 / front panel 6 to the upper / lower / left / right / upper left / lower left / upper right / lower right. It may be attached to the upper edge / lower edge / left edge / right edge / upper left corner / lower left corner / upper right corner / lower right corner. In this way, if the connecting rod 16 is deviated from the center of the soundboard 11 and the center of the front plate 6, the soundboard 11 and the front plate 6 will not resonate, and the musical sound emitted from the entire musical sound device can be obtained. There will be no inadvertent mutation or volume reduction.

  Further, the connecting rod 16 may be attached to the center / center slightly on the lower side of the insertion hole 9 / right / center on the left / right end / left end. Thus, if the connecting rod 16 is provided in the vicinity of the insertion hole 9, the radiation volume from the insertion hole 9 increases.

  Such a connecting rod 16 may be attached to the back side of the soundboard 13 of the soundboard 11. Thereby, the vibration / sound of the soundboard 11 is transmitted to the front plate 6 more quickly. The connecting rod 16 may be attached so as to connect the back surface of the electromagnetic drive unit 14 and the inner surface of the front plate 6, or the upper / lower / left / right / upper left / lower left / upper / It may be attached to the lower right. Thereby, the vibration / sound of the electromagnetic drive unit 14 is transmitted to the front plate 6 more quickly.

  Such a connecting rod 16 includes a soundboard 11, a front plate 6, an electromagnetic drive unit 14, a bottom plate 2, a lower right inner plate 4, a lower left inner plate 5, a middle top plate 7, a keyboard 22, a right outer plate 24, and a left outer. In addition to being provided perpendicular to the plate 25, it may be provided obliquely or a plurality of pieces may be received. The connecting rod 16 may be thicker or thinner than the sounding rod 13. The connecting rod 16 may be straight or curved.

  Furthermore, the connecting rod 16 may be provided so as to be connected to any one of the above-mentioned sounding rods 13... May be attached between the sounding rods 13. Further, the connecting rod 16 may be attached to the opposite side surface of the sound board 11 at a position where any of the sound bars 13 is attached, or the position where the sound bars 13 are not attached, that is, the sound bars 13. It may be attached to the opposite side of the soundboard 11 between.

  In addition to the inner surface of the soundboard 11 and the inner surface of the front plate 6, the connecting rod 16 includes the bottom plate 2, the lower right inner plate 4, the lower left inner plate 5, the middle top plate 7, the keyboard 22, the right outer plate 24, and the left outer plate 25. It may be connected to the inner surface such as.

  The cross-sectional shape of the connecting rod 16 may be any shape as long as it is elongated, such as a square, triangle, polygon, circle, ellipse, semi-circle, kamaboko, and fan. The thickness of the connecting rod 16 may be uniform, thin thick may be alternately replaced, the center may be thinned or thickened, or the end may be thickened or thinned.

  Between the sound board 11 to which such a connecting rod 16 is connected and the main body of the musical sound device, a flexible, elastic or / and cushioning intervening band 8 is sandwiched. Even if the sound is propagated to the musical sound device main body through the connecting rod 16, this vibration / sound is prevented from being transmitted again to the soundboard 11 by the intervening band 8, and the soundboard 11 is prevented from resonating. The musical sound that is emitted will not be changed inadvertently or the volume will be reduced.

  The intervening band 8 may also be sandwiched between both ends of the connecting rod 16 and the soundboard 11 or / and the front plate 6. Further, the connecting rod 16 may be divided in the longitudinal direction, and the intervening band 8 may be sandwiched between the plurality of connecting rods 16. Thereby, resistance / brake is not applied to the vibration of the soundboard 11.

  The soundboard 11 and the front plate 6 connected and connected by the connecting rod 16 are softer on the soundboard 11 and harder on the front plate 6. As a result, the soundboard 11 is more responsive / responsive to sound / vibration, and the reverberation of the front plate 6 is longer. Conversely, the soundboard 11 may be harder and the front plate 6 may be softer, or both may have the same hardness.

(8) Attachment method of connecting rod 16 (connector) The attachment position of the connecting rod 16 is determined as follows. First, the frequency characteristic of the soundboard 11 before the connecting rod 16 is attached is measured. In this case, in a state where the sound board 11 is attached to the musical sound device, the electromagnetic drive unit 14 attached to the sound board 11 is supplied with various frequency / pitch music signals, all frequency bands / pitch music signals. Alternatively, a white noise signal is sent to vibrate the soundboard 11 in the entire frequency band.

  The vibration / sound of the soundboard 11 is picked up by a microphone, and the picked up sound is analyzed by a frequency band analyzer (known) to measure the frequency characteristics of the soundboard 11. Such frequency characteristics are as shown in FIG. 10, for example. In the frequency characteristic shown in FIG. 10, the level characteristic is usually not flat, and the level is different, and there are irregularities, and a convex part with a high level and a concave part with a low level can be formed.

  Of these, a musical tone signal obtained by synthesizing a center frequency of a convex portion having a high level or a plurality of frequencies only in the vicinity of this convex portion is sent to the electromagnetic drive unit 14, and in this state, the contact of the connecting rod 16 to the soundboard 11 The position / connection position / connection position is sequentially switched. As a result, the level of the frequency characteristic of the convex portion having a large level increases or decreases.

  Here, a search is made for a position where the level of the frequency characteristic of the convex portion having a large level becomes small so that the frequency characteristic of FIG. 10 becomes flat as shown in FIG. The positions are connected / connected / abutted, and the attachment position of the connecting rod 16 is determined.

  Further, a musical tone signal obtained by synthesizing the center frequency of the concave portion having a small level or a plurality of frequencies only in the vicinity of the concave portion is sent to the electromagnetic drive unit 14, and in this state, the contact position of the connecting rod 16 to the soundboard 11 Switch sequentially between connecting position / connecting position. As a result, the level of the frequency characteristic corresponding to the concave portion having a small level increases or decreases.

  Here, a search is made for a position where the level of the frequency characteristic of the concave portion having the small level becomes large so that the frequency characteristic of FIG. 10 becomes flat as shown in FIG. The positions are connected / connected / abutted, and the attachment position of the connecting rod 16 is determined.

  In this way, the attachment position of the connecting rod 16 is determined. Among the above, the position where the level of the frequency characteristic of the convex part with a large level becomes small, the position where the level of the frequency characteristic for the concave part with a small level becomes large, Which one is selected is determined by a predetermined condition such as which one of the convex portion having a higher level and the concave portion having a lower level protrudes.

  In this case, the connecting rod 16 may be attached to both positions, the position where the frequency characteristic level of the convex part of another large level becomes small, and the frequency characteristic level of the concave part of another level is large. The connecting rod 16 may also be attached to the position.

  If the attachment position of the connecting rod 16 is determined in this way and the connecting rod 16 and the soundboard 11 and the sound device are produced without changing the material and dimensions of the connecting rod 16 and the soundboard 11, these are the same. The frequency characteristic is corrected / corrected to be flat.

  The sounding rods 13 are attached to the position of the sounding board 11 where the level of the frequency characteristic of the convex part having a large level is small, and the connecting bar 16 has a large level of the frequency characteristic mainly for the concave part having a small level. It attaches to the position of the sound board 11 which becomes. This is because the sounding bar 13 has a relatively high function of dispersing the sound throughout the sounding board 11, and the connecting bar 16 resonates the sound of the sounding board 11 with the front plate 6 to increase the volume of the entire musical sound device. Is relatively high.

  Of course, the above-mentioned sounding bar 13 is attached to the position of the sounding board 11 where the level of the frequency characteristic of the concave part having a small level is mainly increased, and the connecting bar 16 is mainly the level of the frequency characteristic of the convex part having a high level. It may be attached to the position of the soundboard 11 where becomes small.

  The connecting bar 16 is attached between the sounding bars 13... So as not to be connected to the sounding bar 13, or the opposite side surface of the sounding board 11 between the sounding bars 13. It is attached to. Thereby, the sound / vibration of the entire soundboard 11 can be transmitted to the front plate 6 almost uniformly.

  On the other hand, the connecting rod 16 may be provided so as to be connected to any of the above-mentioned sounding rods 13... Or opposite to the sounding plate 11 at a position where any of the sounding rods 13. It may be attached to the side. As a result, the frequency of the concave portion having a small level or the convex portion having a high level corrected by the connected sounding bar 13 is mainly transmitted to the front plate 6 well.

  After the sound bars 13 are attached to the sound board 11, the connecting bars 16 are connected and attached between the sound board 11 and the front plate 6. Thereby, the sound of the frequency characteristic which has been flattened to some extent by the sound bars 13. That is, after adjusting the frequency characteristics of the sound board 11 by adjusting the sound bars 13..., The frequency characteristics of the entire musical tone device can be adjusted by adjusting the connecting bars 16.

  On the other hand, the connecting rod 16 may be connected and attached between the sound board 11 and the front plate 6 before the sound bars 13 are attached to the sound board 11. As a result, it is possible to make the sound having the frequency characteristics of the sound board 11 flattened to some extent by the connecting rod 16 or by leveling the concave portions. That is, after adjusting the frequency characteristics of the entire musical sound device by adjusting the connecting rod 16, the frequency characteristics of the soundboard 11 can be adjusted by adjusting the sounding bars 13.

(9) Intervening band (intervening body) 8
The intervening band (intervening body) 8 is made of foamed urethane resin, rubber, foamed urethane, urethane elastomer, styrenic polymer, epoxy, vinyl chloride, vinyl acetate, synthetic rubber, etc., flexible, elastic or / and cushioning. Made of soft resin, cloth, paper, pulp, etc.

  The density of the intervening band 8 is, for example, 240 kg / m 3, 25% compression load is, for example, 0.04 Mpa, tensile strength is, for example, 0.54 Mpa, elongation is, for example, 115%, tear strength is, for example, 1.8 N / mm, and compression residual strain is For example, 2.7% (measured at 70 ° C. × 22 hr, 50% compression), compression set is, for example, 7.6%, and thickness tolerance is, for example, ± 10%. The thickness of the intervening band 8 is, for example, 1.0 mm to 10.0 mm, desirably 2.0 mm to 7.0 mm, and more desirably 3.0 mm to 4.0 mm.

  In the compressed state described below, the thickness of the intervening band 8 is required to be at least 0.5 mm. At the time of 0% compression described below, the thickness of the intervening band 8 is required to be at least 0.5 mm. In the case of 90% compression described below, the thickness of the intervening band 8 is required to be at least 5.0 mm or more.

  The soundboard 11 is fixed to the contact frame 3 by pressing it with a wood screw or the like. In this case, the thickness of the intervening band 8 is 0% to 90%, preferably 0% to 80%, more preferably 0% to 70%, further preferably 0% to 60%, and still more preferably 0%. To 50%, even more desirably 0% to 45%, even more desirably 0% to 40%, even more desirably 0% to 35%, even more desirably 0% to 30%, even more desirably 0% Compressed to 25%, more desirably 0% to 20%, even more desirably 0% to 15%, even more desirably 0% to 10%.

  Alternatively, the thickness of the intervening band 8 is 0% to 90%, preferably 0% to 80%, more preferably 1% to 70%, more preferably 1% to 60%, and still more preferably 2% to 50%, even more desirably 2% to 45%, even more desirably 3% to 40%, even more desirably 3% to 35%, even more desirably 4% to 30%, even more desirably 4% to The compression state is 25%, more preferably 5% to 20%, still more preferably 5% to 15%, and still more preferably 6% to 10%.

  If the compression ratio of the thickness of the intervening band 8 is small, there is a high possibility that the intervening band 8, the contact frame 3 and the soundboard 11 may collide with each other due to vibration. There is not much chance of meeting. If the compression ratio of the thickness of the intervening band 8 is large, vibration is easily transmitted from the soundboard 11 to the contact frame 3, and the musical sound emitted from the soundboard 11 is inadvertently changed or the volume is reduced. However, if the compression rate does not exceed 90% and the thickness is 0.5 mm or more, the musical sound emitted from the soundboard 11 is inadvertently changed or the volume is reduced. The effect of preventing this is maintained.

  Therefore, there is no gap between the intervening band 8, the contact frame 3, and the soundboard 11. As a result, the intervening band 8, the contact frame 3 and the soundboard 11 do not collide with each other by vibration, and no abnormal vibration / abnormal sound is generated. Musical sounds will not be inadvertently mutated or volume reduced.

  Since the flexible, elastic and / or cushioning intervening band 8 is interposed between the abutment frame 3 and the sound board 11 of the music apparatus main body, the sound board 11 is the sound apparatus main body, It will be in the state which does not contact the contact frame 3 directly.

  Therefore, the sound / vibration of the soundboard 11 is not directly transmitted to the music apparatus main body, and the music sound emitted from the soundboard 11 is not inadvertently changed or the volume is not reduced. Without such an intervening band 8, resistance / brake is applied to the vibration of the soundboard 11 and the sound volume is reduced. However, with such an intervening band 8, resistance / brake is not applied to the vibration of the soundboard 11. Does not take, and the volume increases.

(10) Insertion hole 9
FIG. 6 shows the frequency characteristics of the sound radiated from the soundboard 11. The solid line in FIG. 6 shows the characteristics when the insertion hole 9 is provided, and the broken line in FIG. 6 shows the characteristics when there is no insertion hole 9. When the insertion hole 9 is provided on the front surface of the musical instrument main body, the sound volume increases from 130 Hz to 150 Hz (near 140 Hz) to 180 Hz in the frequency characteristics of the soundboard 11.

  The sound from the insertion hole 9 and the sound from the soundboard 11 are the same sound, but the sound from the insertion hole 9 is radiated from the inside of the soundboard 11, and the sound from the outside of the soundboard 11 is Although the phase is reversed, the sound from the insertion hole 9 is radiated to the opposite side of the outer surface of the soundboard 11 and is not radiated in the same direction as the outer surface of the soundboard 11, so these sounds cancel each other or have an adverse effect. The musical sound emitted from the soundboard 11 is not inadvertently changed or the volume is not reduced.

  Such an insertion hole 9 is the upper edge of the front plate 6 and is preferably located closer to the keyboard 22 such as below or above the keyboard 22. As a result, it is possible to obtain a feeling that the performer is wrapped in the sound that he / she is playing, and a performance feel close to that of an actual acoustic instrument.

  The insertion holes 9 are divided into three as described above, and the number of the insertion holes 9 is three. The vertical length of each insertion hole 9 is about 7 cm, and the side of each insertion hole 9 is approximately the width of the front plate 6. / 3. When the vertical or horizontal dimension of the insertion hole 9 is increased or the number of the insertion holes 9 is increased, the specific frequency component is increased or decreased, for example, the volume of bass is increased from the above 130 Hz to 150 Hz (around 140 Hz) from around 180 Hz. As shown, the frequency characteristics change variously.

  When the vertical or horizontal dimension of the insertion hole 9 is reduced or the number of the insertion holes 9 is reduced, a specific frequency component such as a higher sound volume is increased from the above 130 Hz to 150 Hz (around 140 Hz) from around 180 Hz. The frequency characteristic changes variously, such as increasing or decreasing. In this way, the size and the number of the insertion holes 9 are determined so that the entire frequency characteristic of FIG. 6 is flattened or equalized.

  The insertion hole 9 may be provided at the center, the left side, the right side, the lower side, the center slightly left side, the center slightly right side, the center slightly lower side, the center slightly above, or the like of the front plate 6. The shape of the insertion hole 9 may be any shape such as a vertical direction, an oblique direction, a circle, an ellipse, or a polygon. Further, the insertion hole 9 may be one or a plurality, and a part or the whole of the insertion hole 9 may be omitted.

(11) Drive Circuit FIG. 8 shows a drive circuit (musical sound control circuit) for the electromagnetic drive unit 14, the top speakers 31L, 31R, 32L, and 32R, and the front tweeters 33L and 33R. The panpot circuit 41 outputs a plurality of left and right channel musical sound signals for forming an analog sound image converted from digital.

  The left musical sound signal L from the panpot circuit 41 is filter-controlled by the left DSP filter 42L, and as shown in FIG. 6, the frequency characteristics are flattened by the left 4-band equalizer 43L, amplified by the left amplifier 44L, Sound is output from the two upper left speakers 31L and 32L. The output of the left amplifier 44L is filter-controlled by the left network filter 45L, and the sound is output from the left front tweeter 33L. “DSP” means digital signal processor.

  The right musical tone signal R from the panpot circuit 41 is filter-controlled by the right DSP filter 42R, the frequency characteristic is flattened by the right 4-band equalizer 43R, and amplified by the right amplifier 44R, as shown in FIG. Sound is output from the two upper speakers 31R and 32R on the right side. The output of the right amplifier 44R is filter-controlled by the right network filter 45R, and the sound is output from the right front tweeter 33R.

  Further, the left musical sound signal L and the right musical sound signal L from the panpot circuit 41 are synthesized, and as shown in FIG. 6, the frequency characteristics are flattened by a three-band equalizer 46, amplified by an amplifier 47, and The sound is sent to the electromagnetic drive unit 14 and output from the soundboard 11.

  In the network filters 45L and 45R, high sounds are extracted, medium sounds and low sounds are cut, and as shown in FIG. 6, the sound of 6 kHz to 15 kHz is left 4 band equalizer 43L and right 4 band equalizer 43R, and the frequency characteristics are Flattened and output from the front tweeters 33L and 33R.

  In the left DSP filter 42L and the right DSP filter 42R, the cutoff frequency or / and the attenuation amount are controlled based on the filter setting data sent from the register 48, and as shown in FIG. The left 4-band equalizer 43L and the right 4-band equalizer 43R have a flat frequency characteristic and are output from the top speakers 31L, 31R, 32L, and 32R.

  Further, in the left DSP filter 42L and the right DSP filter 42R, the cutoff frequency or / and the attenuation amount are controlled based on the filter setting data sent from the register 48, and as shown in FIG. The sound is output from the electromagnetic drive unit 14 and the soundboard 11 with the frequency characteristics made flat by the three-band equalizer 46.

  The panel switch group on the front side of the musical sound device is provided with a changeover switch 49 that is operated when the musical sound device is installed close to the wall. The ON data of the changeover switch 49 is converted by the decoder 50 into filter control data for changing the cutoff frequency or / and changing the attenuation amount, and stored in the register 48.

  Further, a wall approach sensor 51 using an ultrasonic sensor or an elongated protrusion is provided on the back surface or the top surface of the musical sound device. The ON data of the wall approach sensor 51 is converted into filter control data for changing the cutoff frequency or / and changing the attenuation amount by the decoder 50 and stored in the register 48.

  This filter control data, for example, lowers the attenuation / level of the medium sound component of 180 Hz to 6 kHz, so that when the musical sound device is installed close to the wall, the upper speaker 31L, 31R, The sound volume in the middle range from 32L and 32R is reduced.

  Such left DSP filter 42L and right DSP filter 42R may be provided only at the input ends of the inner upper surface speakers 31L and 31R. As a result, it is possible to reduce only the volume of the middle sound range on the back of the music stand 36 and to reduce the volume reflected on the wall. Further, the left DSP filter 42L and the right DSP filter 42R may be provided only at the input ends of the outer top speakers 32L and 32R. As a result, only the volume of the midrange outside the music stand 36 can be reduced, and the volume reflected on the wall can be reduced.

  Further, such a left DSP filter 42L or a right DSP filter 42R may be provided only at the input end of the electromagnetic drive unit 14. Thereby, it is possible to reduce only the volume of the low frequency range radiated from the soundboard 11 on the back surface of the musical sound device, and to reduce the volume reflected on the wall. Such left DSP filter 42L and right DSP filter 42R may be provided only at the input ends of the front tweeters 33L and 33R. As a result, it is possible to reduce only the high-frequency volume on the front surface of the musical sound device and to reduce the volume reflected on the wall.

  The frequency characteristics in FIG. 6 are not the frequency characteristics of the sound signals sent to the front tweeters 33L and 33R, the top speakers 31L, 31R, 32L and 32R, and the electromagnetic drive unit 14, but the front tweeters 33L and 33R, the top speakers 31L and 31R, 32L, 32R, frequency characteristics of sound actually radiated from the soundboard 11 are measured.

(12) Other Embodiments The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, the electromagnetic drive unit (conversion body / electromagnetic drive body / rear sound emitting body) 14 may be attached to the lower side, the right side, the left side, the upper right corner, the lower right corner, the lower left corner, and the upper left corner of the soundboard 11. .

  The electromagnetic drive unit 14 and the soundboard 11 may be provided on the upper surface, front surface, left side surface or right side surface of the musical sound device, or may be replaced by a tweeter or a speaker. The top speakers 31L, 31R, 32L, and 32R may be provided on the front, back, left side, or right side of the musical sound device, or may be replaced with electromagnetic drive units or tweeters. The front tweeters 33L and 33R may be provided on the top surface, back surface, left side surface or right side surface of the musical sound device, or may be replaced with an electromagnetic drive unit or a speaker.

  The front tweeters 33L and 33R and the upper surface speakers 31L, 31R, 32L and 32R may be singular, and the musical sound signal to be sent may be a monaural signal. A plurality of electromagnetic drive units 14 may be provided, and the musical sound signal to be sent may be a plurality of channel signals for forming a stereo signal / sound image.

  The convex portion having a large level is replaced with a concave portion having a small level if the vertical axis in FIGS. 9 and 10 is reversed, and the concave portion having a small level is represented in FIGS. If the vertical axis is reversed, it will be replaced by a convex part with a large level.

  The abutment frame 3 may be omitted, and a sound board 11 may be attached to the rear edge of the bottom plate 2, the lower right inner plate 4, the lower left inner plate 5, and the middle top plate 7 via an intervening band 8. The soundboard 11 may be attached to the rear edges of the right outer plate 24, the left outer plate 25, etc. via the intervening band 8, and the contact body may be a part of the musical instrument main body.

  The intervening band 8 may be made of any material as long as it has flexibility, elasticity, or cushioning properties. The front surface of the soundboard 11 and the rear surface of the contact frame 3 partially or entirely overlap, but may not overlap at all. In this case, a portion that is not sandwiched between the front surface of the soundboard 11 and the rear surface of the contact frame 3 is formed in a part of the intervening band 8.

  The soundboard 11 is not in contact with the main body of the musical instrument (the bottom plate 2, the contact frame 3, the lower right inner plate 4, the lower left inner plate 5, the front plate 6, and the center plate 7). Also good. The intervening band 8 may be interposed so that there is a gap in the entire periphery of the soundboard 11, and there may be a small gap between the entire periphery of the soundboard 11 and the main body of the musical sound device.

  There may be a gap in a part of the sound device main body to which the soundboard 11 is attached, on the side on which the soundboard 11 is attached, the upper side, the lower side, the right side, and the left side. The insertion hole 9 on the side opposite to the side on which the sound board 11 is attached of the musical sound device main body to which the sound board 11 is attached may be omitted. One or all of the lower right inner plate 4 and the lower left inner plate 5 or the right outer plate 24 and the left outer plate 25 may be omitted.

  A part or all of the frame bar 12 of the sound board 11 may be omitted, or a part or all of the sound bar 13 of the sound board 11 or the frame bar 12 may be omitted. The cross-sectional shape of the sounding bar 13... Or the frame bar 12 of the sounding board 11 may be any shape as long as it is elongated, such as a square, a triangle, a polygon, a circle, an ellipse, a semicircle, a kamaboko, a fan. The thickness of the sounding bar 13 or the frame bar 12 may be uniform, the thin thick ones are alternately replaced, the center is thinned or thickened, the ends are thickened or thinned, and the straight ones are curved. It may be.

  The sounding bars 13 may be attached at equal intervals, may be attached in the vertical / vertical direction, may be attached in the horizontal / horizontal direction, or a mixture thereof. The sounding bars 13 may be attached not to the outer surface / rear surface / rear surface of the soundboard 11 but also to the inner surface / front surface / front surface, or may be attached to both surfaces. In this case, the soundboard 11 is attached so as to extend in a direction perpendicular to the mesh, but it may be attached so as to extend parallel to the mesh or may be attached so as to extend obliquely.

  The intervals between the sounding bars 13 may be smaller than the diameter of the electromagnetic drive unit 14. In this case, the electromagnetic drive unit 14 is not positioned between the sounding bars 13... And is attached to one or more sounding bars 13. The electromagnetic drive unit 14 may be attached to the center of the soundboard 11. The intervals between the sounding bars 13... May gradually become wider or gradually become narrower as the low-pitched musical tone in the keyboard 22 approaches the output instruction side.

  The musical sound device main body (the bottom plate 2, the contact frame 3, the lower right inner plate 4, the lower left inner plate 5, the front plate 6, the middle top plate 7) was a box shape, but an octahedron, dodecahedron, cylinder, Any shape such as a cylinder, a taper, a trumpet, a sphere, or a curved solid may be used. The shape of the soundboard may be any shape as long as it is flat, such as a circle, a polygon, and a ring, in addition to a square.

  The soundboard 11 is flat, but may be curved in a concave shape or may be curved in a convex shape. Thereby, the waveform of the musical sound generated from the soundboard 11 is not a plane wave but a spherical wave. The electromagnetic drive unit (electromagnetic drive body) 14 may be replaced with a speaker, a tweeter, or the like.

  The musical instrument to which the device of the present invention is attached may be any musical instrument as long as it has a keyboard such as an upright piano, grand piano, electronic piano, electronic organ, harpsichord, electronic harpsichord, pianica, and electronic pianica. In this case, the soundboard 11 is arranged in a substantially horizontal / substantially horizontal direction, not in a substantially vertical / substantially vertical direction, so that the electromagnetic drive unit 14 is also mounted in a substantially horizontal / horizontal direction.

  Further, the mounting position of the electromagnetic drive unit 14 may be not the end of the soundboard 11 but the center or the center. A plurality of electromagnetic drive units 14 may be attached to one soundboard 11. In this case, the electromagnetic drive unit 14 is attached to symmetrical positions at both ends of the soundboard 11. The electromagnetic drive unit 14 may output a high sound, a medium sound, etc. instead of a low sound.

  Further, the musical tone signal composed of plural types of musical sounds is composed of plural types of musical instruments, timbres, tone pitches and / or touch musical tone signals, and is a musical tone signal that is polyphonically generated. Contains musical sounds in each frequency band, treble. Such musical tone signals include the musical tone signal of the string itself, the tube itself, and the percussion part, as well as the musical tone signal of the soundboard part. Or a musical tone signal on the soundboard portion of an actual acoustic instrument, or a musical tone signal composed of the above-mentioned plural types of musical tone may be a digital signal such as PCM.

(13) Effects of other inventions [1] A sound board of a flat musical instrument that emits sound when vibrated and a musical sound signal composed of a plurality of types of musical sounds are converted into mechanical changes, and the sound board of the musical instrument is A converter that is driven to emit sound; and an elongated connecting body that is attached between the inner surface of the soundboard and the inner surface of the surface opposite to the soundboard in the musical sound device, and that connects both inner surfaces. For the musical sound device, the step of measuring the frequency characteristics of the soundboard before the connection body is attached, and the soundboard with the frequency of the portion with the higher level or the lower portion of the frequency characteristics with different measured levels. The frequency characteristic is measured by oscillating, and the position where the connecting body abuts on the soundboard is switched to increase the frequency characteristic level of the low level part or the frequency characteristic of the high level part. Les A step of searching a position where Le is reduced, a method of producing musical sound apparatus, characterized in that the search position and a step of the position where the connecting member is connected.

[2] A step of measuring the frequency characteristics of the soundboard, and a step of measuring the frequency characteristics by vibrating the soundboard at a frequency of a portion having a higher level or a portion having a lower level among the frequency characteristics having different levels. For the sounding rod attached to the surface of the soundboard, the position where the sounding rod contacts the sounding plate is switched, and the level of the frequency characteristic of the portion with the lower level increases or the frequency of the portion with the higher level The method for producing a musical sound device according to claim 1, further comprising a step of searching for a position where the level of the characteristic decreases, and a step of setting the searched position to a position where the sounding bar is attached. As a result, the frequency characteristics of the soundboard are flattened, and even if the frequency / pitch of the sound output from the soundboard changes, the volume does not change inadvertently and is uniform over all frequencies / pitch. Can achieve sound volume characteristics.

[3] The method for producing a musical sound device according to claim 1 or 2, wherein the connected body is connected to the soundboard after the soundbar attached to the surface of the soundboard is attached to the soundboard.

[4] The coupling body is attached to a soundboard position where the level of the frequency characteristic of the portion with a small level increases, and the sounding rod attached to the surface of the soundboard has a reduced frequency characteristic level of the portion with a high level. 4. The method for producing a musical sound device according to claim 2, wherein the musical sound device is attached at a position of a soundboard. The function of a sounding rod that disperses the sound throughout the soundboard can be exhibited, and the function of a connecting rod that increases the volume of the entire musical sound device by resonating the sound of the soundboard with the front plate can be exhibited.

[5] A sound board of a flat musical instrument that emits sound when vibrated, and a conversion that converts a musical sound signal composed of a plurality of types of musical sounds into a mechanical change and drives the musical instrument's sound board to emit the sound A musical sound device comprising: a body; and an elongated connecting body that is attached between an inner surface of the soundboard and an inner surface of a surface opposite to the soundboard in the sound device and that connects the inner surfaces.

[6] The musical sound device according to claim 5, wherein the soundboard is attached to the rear surface of the musical sound device, and the connecting body is attached between the inner surface of the soundboard and the inner surface of the front plate of the musical sound device. . As a result, the vibration / sound of the soundboard is well transmitted to the opposite side of the soundboard, and the sound is also emitted from the opposite side of the soundboard. In addition, the vibration of the soundboard will not resonate, and the musical sound emitted from the soundboard will not be inadvertently mutated, making it possible to approximate the sound of an actual acoustic instrument.

[7] A plurality of elongate sounding rods are attached to the surface of the sounding plate, the intervals between the sounding rods are non-uniform, and the connection body or the conversion body is attached between the sounding sound bars. The musical sound device according to claim 5 or 6, characterized in that. As a result, there is a difference in the height of the musical sound emitted from the soundboard portions at each interval of the soundbar, and the vibration of each portion of the soundboard does not resonate.

[8] The musical tone device includes a keyboard for instructing output of a plurality of musical tones having different pitches from a high range to a low range, and mainly the low range musical tone is output from the converter. The musical sound device according to claim 5, 6 or 7. As a result, a musical sound in the low frequency range is actually emitted from the low frequency range side of the keyboard, and a vibration / feel similar to the performance state of the actual keyboard instrument can be obtained.

[9] The music apparatus main body to which the soundboard is attached is characterized in that the side to which the soundboard is attached, the upper side, the lower side, the right side, and the left side are sealed without gaps. The musical sound device described. As a result, the sound from the soundboard does not leak from the left, right, top and bottom of the soundboard, and the musical sound emitted from the soundboard is not inadvertently changed or the volume is not reduced.

[10] The musical instrument main body to which the soundboard is attached has an insertion hole formed on the side opposite to the side to which the soundboard is attached, according to claim 5, 6, 7, 8, or 9. Musical device. As a result, the sound of the soundboard is radiated to the opposite side of the soundboard of the musical sound device, and the sound emitted from the soundboard does not cancel or adversely affect each other. The generated musical sound is not inadvertently changed or the volume is reduced, and the vibration of the soundboard is also radiated to the front surface of the musical sound device, so that it feels like an actual acoustic keyboard instrument.

[11] A keyboard for instructing output of a plurality of musical tones having different pitches from a high range to a low range, a back sound emitting body for emitting sound, provided on the back side of the keyboard, and the keyboard An upper surface sound emitting body that emits sound in a frequency band different from that of the rear sound emitting body, and a front surface sound emitting body provided on the front side of the keyboard. A musical sound device comprising a sound emitting body and a front sound emitting body that emits sound having different frequency bands.

[12] A music stand is provided in the vicinity of the keyboard, a plurality of the upper surface sound emitting bodies are provided, and a part of the plurality of upper surface sound emitting bodies is disposed behind the music stand, the plurality of upper surface sound emitting bodies. The other part of the sound emitting body is disposed in front of or on the side of the music stand.

[13] By detecting that a wall is approaching the back of the musical sound device, among the frequency components of the sound radiated from the upper surface sound emitting body, front surface sound emitting body or back surface sound emitting body, The musical sound device according to claim 11 or 12, wherein a component of a sound range or a low sound range is reduced. As a result, the frequency band components reflected from the wall can be reduced, and a uniform volume characteristic can be realized over the entire band.

[14] At least one of the rear sound emitting body, the upper surface sound emitting body, and the front sound emitting body is a soundboard of an instrument that radiates and emits sound, and on the side opposite to the side on which the soundboard is attached The musical sound device according to claim 11, 12 or 13, wherein an insertion hole is formed. As a result, the sound of the soundboard is radiated to the opposite side of the soundboard of the musical sound device, and the sound emitted from the soundboard does not cancel or adversely affect each other. The generated musical sound is not inadvertently changed or the volume is reduced, and the vibration of the soundboard is also radiated to the front surface of the musical sound device, so that it feels like an actual acoustic keyboard instrument.

[15] At least one of the rear sound emitting body, the upper surface sound emitting body, and the front sound emitting body is a mechanical soundboard sound board composed of a musical soundboard that emits sound when vibrated and a plurality of types of musical sounds. It is converted to drive the soundboard of the musical instrument to emit sound, and is composed of an electromagnetic driving body attached to the soundboard. At least one other is composed of a speaker. The musical sound device according to claim 11, 12, 13 or 14. As a result, a sounding body that is complex and balanced between the soundboard and the speaker can be provided.

[16] At least one of the back sound emitting body, the top sound emitting body, and the front sound emitting body is a soundboard of a musical instrument that emits sound by being vibrated, and at least one other is a plurality of speakers. 16. The musical sound device according to claim 11, wherein a plurality of channel signals for forming a sound image are respectively sent to the plurality of speakers. As a result, a sounding body that is complex and balanced by the soundboard and the speaker can be provided, and a sound image can also be formed.

[17] Between the inner surface of the musical sound device main body to which the soundboard is attached and the inner surface of the soundboard opposite to the side on which the soundboard is attached, and the inner surface of the soundboard, an elongated connecting body that connects both inner surfaces is attached. The musical sound device according to claim 11, 12, 13, 14, 15, or 16. As a result, the vibration / sound of the soundboard is well transmitted to the opposite side of the soundboard, and the sound is also emitted from the opposite side of the soundboard. In addition, the vibration of the soundboard will not resonate, and the musical sound emitted from the soundboard will not be inadvertently mutated, making it possible to approximate the sound of an actual acoustic instrument.

[21] A sound board of a musical instrument that oscillates and emits sound, and an electromagnetic driving body that converts a musical sound signal composed of a plurality of types of musical sounds into a mechanical change and drives the sound board of the musical instrument to emit sound. The electromagnetic driving body is mounted at a position deviated from the center of the soundboard, and is a plurality of elongated soundbars mounted on the surface of the soundboard, and the intervals between the soundboards are not uniform. The musical sound device is characterized in that the electromagnetic driving body is mounted between the sounding bars.

[22] The musical tone device includes a keyboard for instructing output of a plurality of musical tones having different pitches from a high frequency range to a low frequency range, and the electromagnetic driver is close to a low frequency side of the keyboard on the sound board. The musical sound device according to claim 21, wherein the musical sound device is attached at a different position. As a result, a musical sound is mainly emitted from a position closer to the low frequency range of the keyboard, and a musical sound device with an emphasis on the low frequency can be realized.

[23] The musical tone device includes a keyboard for instructing output of a plurality of musical tones having different pitches from a high frequency range to a low frequency range, and each interval between the sounding rods becomes wider toward the low frequency side of the keyboard. The musical sound device according to claim 21 or 22, characterized in that As a result, in the soundboard, the closer to the low frequency side of the keyboard, the higher the proportion of the musical sound in the low frequency range, and the vibration / feel close to the actual playing state of the keyboard instrument can be obtained.

[24] The musical tone device includes a keyboard for instructing output of a plurality of musical tones having different pitches from a high range to a low range, and mainly the low range musical tone is output from the electromagnetic driver. The musical sound device according to claim 21, 22 or 23. As a result, a musical sound in the low frequency range is actually emitted from the low frequency range side of the keyboard, and a vibration / feel similar to the performance state of the actual keyboard instrument can be obtained.

[25] A long and slender connecting body connecting both inner surfaces is attached between the inner surface of the musical sound device main body to which the soundboard is attached and the inner surface of the soundboard opposite to the side to which the soundboard is attached. 25. The musical sound device according to claim 21, 22, 23, or 24. As a result, the vibration / sound of the soundboard is well transmitted to the opposite side of the soundboard, and the sound is also emitted from the opposite side of the soundboard. In addition, the vibration of the soundboard will not resonate, and the musical sound emitted from the soundboard will not be inadvertently mutated, making it possible to approximate the sound of an actual acoustic instrument.

[26] The musical sound device according to [21], [22], [23], [24] or [25], wherein the electromagnetic driver is attached at a position shifted upward from the center of the soundboard. As a result, the vibration of the soundboard does not resonate, the musical sound emitted from the soundboard is not inadvertently mutated, and the sound of an actual acoustic instrument can be brought close to.

[27] The music apparatus main body to which the soundboard is attached is characterized in that the side to which the soundboard is attached, the upper side, the lower side, the right side and the left side are sealed without gaps. 25, 26 or 26. As a result, the sound from the soundboard does not leak from the left, right, top and bottom of the soundboard, and the musical sound emitted from the soundboard is not inadvertently changed or the volume is not reduced.

[28] An insertion hole is formed on the side of the musical sound device main body to which the soundboard is attached, on the side opposite to the side to which the soundboard is attached, 21, 22, 23, 24, 25, 26 Or the musical tone apparatus of 27. As a result, the sound of the soundboard is radiated to the opposite side of the soundboard of the musical sound device, and the sound emitted from the soundboard does not cancel or adversely affect each other. The generated musical sound is not inadvertently changed or the volume is reduced, and the vibration of the soundboard is also radiated to the front surface of the musical sound device, so that it feels like an actual acoustic keyboard instrument.

[31] A sound board of a musical instrument that oscillates and emits sound, an electromagnetic driver that converts a musical sound signal composed of a plurality of types of musical sounds into mechanical changes, and drives the sound board of the musical instrument to emit sound. A contact body provided on the musical sound device main body, on which the edge of the soundboard abuts, and a flexible interposer sandwiched between the contact body and the edge of the soundboard. A musical sound device characterized by that.

[32] An instrument sound board that oscillates and emits sound, and an electromagnetic driver that converts a musical sound signal composed of a plurality of types of musical sounds into mechanical changes to drive the musical instrument sound board to emit sound A contact body provided on the main body of the musical sound device and in contact with an edge of the soundboard; a flexible interposer sandwiched between the contact body and an edge of the soundboard; The soundboard is in a state where it does not contact the musical instrument main body at all, and there is no gap between the interposition body, the contact body and the soundboard, and the thickness of the interposition body is compressed by 0% to 90%, A musical sound device comprising: a fixing mechanism that presses and fixes the soundboard to the contact body.

[33] The sounding board is characterized in that the intervening body is interposed in the entire periphery of the soundboard without any gap, and is sealed without a gap between the entire periphery of the soundboard and the main body of the musical sound device. Or the musical tone apparatus of 32. As a result, the sound from the soundboard does not leak from around the soundboard, and the musical sound emitted from the soundboard is not inadvertently changed or the volume is not reduced.

[34] The sound equipment main body to which the soundboard is attached is characterized in that the side to which the soundboard is attached, the upper side, the lower side, the right side, and the left side are sealed without gaps. Musical device. As a result, the sound from the soundboard does not leak from the left, right, top and bottom of the soundboard, and the musical sound emitted from the soundboard is not inadvertently changed or the volume is not reduced.

[35] The musical sound device according to claim 31, 32, 33, or 34, wherein an insertion hole is formed on the opposite side of the musical sound device main body to which the soundboard is attached to the side on which the soundboard is attached. . The sound of the soundboard is radiated on the opposite side of the soundboard of the music device, and the sound emitted from the soundboard does not cancel or adversely affect the sound emitted from the soundboard. There is no inadvertent mutation or volume reduction, and the vibration of the soundboard is also radiated to the front of the musical sound device, making it feel like an actual acoustic keyboard instrument.

[36] The musical sound device according to [31], [32], [33], [34] or [35], wherein the intervening body has elasticity and / or cushioning properties in addition to the flexibility. As a result, the sound of the soundboard is not transmitted to the main body of the musical sound device, and the sound generated from the soundboard is not inadvertently changed or the volume is not reduced.

[37] The thickness of the inclusion is 0% to 90%, preferably 0% to 80%, more preferably 0% to 70%, more preferably 0% to 60%, and even more preferably 0% to 90%. 50%, even more desirably 0% to 45%, even more desirably 0% to 40%, even more desirably 0% to 35%, even more desirably 0% to 30%, even more desirably 0% to 32, 33, 34, compressed by 25%, more preferably 0% to 20%, even more preferably 0% to 15%, even more preferably 0% to 10%. The musical sound device according to 35 or 36.

  As a result, there is no gap between the contact body, the interposition, and / or the soundboard, and no abnormal vibration / sound / resonance occurs between them. Will not decrease.

[38] The musical tone device is a keyboard instrument, and the sound board is attached to the back side of the musical instrument of the keyboard instrument, and an insertion hole is formed below the keyboard on the front side of the musical instrument. The musical sound device according to claim 31, 32, 33, 34, 35, 36 or 37. Thereby, the vibration of the soundboard is propagated to the keyboard, and a feeling like an actual acoustic keyboard instrument is obtained.

  The sound board of the musical sound device and the other side are connected by a connecting body, and the vibration / sound of the sound board is well transmitted to the other side, so that the sound device as a whole produces a good sound. Between the inner surface center of the soundboard 11 and the inner surface of the front plate 6 on the opposite side of the soundboard 11, a straight connecting rod 16 that connects both the inner surfaces is sandwiched. By this connecting rod 16, the vibration / sound of the soundboard 11 is smoothly transmitted to the front plate 6, and a musical sound is emitted from the entire musical sound device.

  The entire frequency band signal is sent to the electromagnetic drive unit 14 to vibrate the soundboard 11 in the entire frequency band, and the frequency characteristics of the soundboard 11 are measured. Among them, a musical tone signal having a high level convex portion frequency is sent to the electromagnetic drive unit 14, and the position where the connecting rod 16 is connected to the soundboard 11 is sequentially switched. A position where the level of the frequency characteristic of the convex portion having a large level is decreased is searched, and the searched position is set as a position where the connecting rod 16 is connected.

  Sounds having different frequency bands are separately emitted from the back, top surface, and / or front of the music device, and the sound is emitted and diffused in all directions from the music device, thereby realizing a realistic performance. Low-frequency musical sounds are radiated from the electromagnetic drive unit 14 and the soundboard 11 provided on the back side of the keyboard 22 (including the rear side, the same applies to others), and an upper surface speaker 31L provided on the upper surface side of the keyboard 22; 31R, 32L, and 32R emit mid-range musical sounds, and high-frequency musical sounds are emitted from front tweeters 33L and 33R provided on the front side of the keyboard 22.

  The vibration of the soundboard does not resonate, and the sound generated from the soundboard is not inadvertently mutated, so that the sound of an actual acoustic instrument can be realized. The electromagnetic drive unit 14 is attached at a position shifted from the center of the soundboard 11 so that the vibration of the soundboard 11 does not resonate.

  The intervals between the plurality of elongated sounding rods 13 attached to the surface of the sounding board 11 are not uniform, and the sound generated from the sounding board 11 portion of each sounding bar 13 has a difference in height. The vibration will not resonate. The electromagnetic drive unit 14 is mounted between the sounding rods 13, and after the soundboard 11 is vibrated by the electromagnetic drive unit 14, the vibration of the sounding plate 11 is transmitted to the entire sounding plate 11 through the sounding rod 13. The sound is not transmitted to the sounding bar 13 earlier than the sound 11, and the sound is transmitted uniformly to the entire sounding board 11.

  When the sound board is not in contact with the sound device main body and the thickness of the inclusion is compressed, the sound board is pressed against the contact body and fixed, so that vibration from the sound board is directly transmitted to the entire sound device. It wo n’t happen.

  An intervening band 8 having flexibility, elasticity, and cushioning properties is sandwiched between the rear surface of the vertical rectangular contact frame 3 of the musical sound device and the front surface of the outer peripheral edge of the soundboard 11, and the soundboard 11 is contacted. Pressed against the frame 3. Thereby, the vibration from the sound board 11 is not directly transmitted to the entire musical sound device, and the sound is emitted from the sound board 11 without resonance between the intervening band 8, the contact frame 3 and the sound board 11. The musical sound is not inadvertently mutated and can be brought close to the actual acoustic musical instrument.

The back of a musical tone apparatus is shown. The front of a musical sound apparatus is shown. The longitudinal section of a musical tone device is shown. The longitudinal section of a musical tone device is shown. The cross section of a musical tone apparatus is shown. The frequency characteristics of the soundboard 11, the upper surface speakers 31L, 31R, 32L, and 32R, and the front tweeters 33L and 33R are shown. The upper surface of a musical tone apparatus is shown. The drive circuit (musical sound control circuit) of the electromagnetic drive unit 14, the upper surface speakers 31L, 31R, 32L, and 32R, and the front tweeters 33L and 33R is shown. An example of the frequency characteristic of the sound board 11 before the sound bars 13. An example of the frequency characteristic of the soundboard 11 before the connecting rod 16 is attached is shown.

Explanation of symbols

1 ... foot, 2 ... bottom plate, 3 ... contact frame,
4 ... lower right inner plate, 5 ... lower left inner plate,
6 ... Front plate, 7 ... Middle plate,
8: Intervening band (intervening body), 9 ... Insertion hole,
11 ... Sound board (rear sound body), 12 ... Frame stick, 13 ... Sound stick,
14 ... Electromagnetic drive unit (electromagnetic drive body / rear sound emitting body),
16 ... connecting rod (connector),
21 ... Mechanism box, 22 ... Keyboard, 23 ... Wood screw,
24 ... Right outer plate, 25 ... Left outer plate,
31L ... Upper left speaker (inside) (upper sound emitting body),
31R ... Upper right speaker (inside) (upper sound emitting body),
32L ... Upper left speaker (outside) (upper sound emitting body),
32R ... Upper right speaker (outside) (upper sound emitting body),
33L ... Left front tweeter (front sound emitting body),
33R ... Right front tweeter (front sound emitting body),
36 ... music stand, 37 ... heat dissipation network, 41 ... pan-pot circuit,
42L: Left DSP filter, 42R: Right DSP filter,
43L ... Left 4-band equalizer, 43R ... 4-band equalizer,
44L ... Left amplifier, 44R ... Right amplifier,
45L ... left network filter, 45R ... right network filter,
46 ... 3-band equalizer, 47 ... amp,
48 ... Register, 49 ... Changeover switch,
50 ... Decoder, 51 ... Wall proximity sensor.

Claims (10)

The sound board of a flat instrument that oscillates and emits sound,
A converter that converts a musical sound signal composed of a plurality of types of musical sounds into a mechanical change and drives the soundboard of the musical instrument to emit sound;
A musical sound device comprising an inner surface of the soundboard and an elongated connecting body connected between the inner surfaces of the musical sound device and the inner surface of the opposite surface of the soundboard,
Measuring the frequency characteristics of the soundboard before the connection body is attached;
Among the frequency characteristics having different measured levels, a step of measuring the frequency characteristics by vibrating the soundboard at a frequency of a high level part or a low level part;
Switching the position where the connecting body abuts the soundboard, and searching for a position where the level of the frequency characteristic of the portion having a low level increases or the level of the frequency characteristic of a portion of the high level decreases;
And a step of setting the searched position to a position where the connected body is connected. Measuring the frequency characteristics of the soundboard;
Among the frequency characteristics having different measured levels, a step of measuring the frequency characteristics by vibrating the soundboard at a frequency of a high level part or a low level part;
For the sounding rod attached to the surface of the soundboard, the position where the sounding rod contacts the sounding plate is switched, and the level of the frequency characteristic of the portion having the lower level is increased or the frequency characteristic of the portion having the higher level is increased. Searching for a position where the level decreases;
The method for producing a musical sound device according to claim 1, further comprising a step of setting the searched position to a position where the sounding rod is attached.   The method for producing a musical sound device according to claim 1 or 2, wherein the connecting body is connected to the soundboard after the soundbar attached to the surface of the soundboard is attached to the soundboard. The connection body is attached to the position of the soundboard where the level of the frequency characteristic of the small level portion increases,
4. The method for producing a musical sound device according to claim 2, wherein the sounding rod attached to the surface of the sounding board is attached at a position of the sounding board where the level of the frequency characteristic of the portion having a high level is reduced. The sound board of a flat instrument that oscillates and emits sound,
A converter that converts a musical sound signal composed of a plurality of types of musical sounds into a mechanical change and drives the soundboard of the musical instrument to emit sound;
A musical sound device comprising: an inner surface of the soundboard and an elongated connecting body that is attached between the inner surface of the sound device and a surface different from the soundboard, and connects the two inner surfaces.   6. The musical sound device according to claim 5, wherein the soundboard is attached to a rear surface of the musical sound device, and the connecting body is attached between the inner surface of the soundboard and the inner surface of the front plate of the musical sound device.   A plurality of elongate sounding rods are attached to the surface of the sounding plate, the intervals between the sounding rods are non-uniform, and the connecting body or the conversion body is attached between the sounding sounds. The musical sound device according to claim 5 or 6. The musical tone device includes a keyboard for instructing output of a plurality of musical tones having different pitches from a high range to a low range,
8. The musical sound device according to claim 5, 6 or 7, wherein a low-tone musical tone is mainly output from the converter.   9. The musical sound according to claim 5, 6, 7 or 8, wherein a side, upper side, lower side, right side, and left side of the musical sound device main body to which the sound board is attached are sealed without a gap. apparatus.   The musical sound device according to claim 5, 6, 7, 8, or 9, wherein an insertion hole is formed on a side of the musical sound device main body to which the soundboard is attached, on a side opposite to a side on which the soundboard is attached.

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