JP4352908B2 - Sound equipment - Google Patents

Description

The present invention relates to acoustic equipment having a pair of speakers.

  In a conventional audio device, it is usual to place a pair of speakers at the left and right positions in front of a person and listen to an acoustic signal generated from the same pair of speakers. In addition, it is common to enjoy riding on a mobile device such as a skateboard while listening to music generated from headphones.

  However, in the prior art as described above, even if the body is moved, the change in how the sound is heard is scarce, and in some respects it is not interesting.

The present invention has been accomplished to solve the above-described problems, and an object by moving the body, in which way hear the sound is to provide an acoustic equipment vary greatly.

In order to achieve the above object, the present invention is characterized by a board for placing both feet in a state where a human is standing, and a position on both sides sandwiching the standing position in a state where the human is standing with both feet on the board. An acoustic apparatus includes a pair of speakers assembled upward on a board and an acoustic signal supply unit that generates acoustic signals having opposite phases and supplies the acoustic signals to the pair of speakers . In this case, the pair of speakers are arranged on the left and right sides of the human feet while the human is standing with both feet on the board, respectively, or on the front and rear sides of the human feet. And it is preferable that this both side position is arrange | positioned symmetrically centering | focusing on a standing position. According to this, the sound emitted upward from each of the pair of speakers is blocked by the human body and is difficult to crosstalk. Therefore, if a person changes his / her posture on the board, such as twisting his / her body or moving his / her face, the left and right ears will hardly hear the sound from one speaker, or may be heard from both speakers, depending on the posture. The ratio of sound changes greatly. As a result, according to the characteristics of the present invention, by moving the body, the way the sound is heard changes greatly, and an interesting experience can be achieved.
In this case, the pair of acoustic signals having opposite phases may be the same acoustic signals having different phases, or may be acoustic signals for the left channel and the right channel in a normal audio device. According to this, the change of the sound according to the movement of the body described above can be increased, and a more interesting experience can be achieved. This has been confirmed by experiments.

Another feature of the present invention is that the board is a board that a person can ride and can move by power or human power . In this case, the speed of the board, movement conditions such as traveling direction, for example, a human manually, such as by movement of the weight, but be changed. And a board is good to move on rotation of a wheel (tire), or to slide on snow, ice, etc. The board may have any moving means for moving using power, human power, gravity, and the like . According to is this, it said in addition to the effects of the present invention, by a person on the board is moving the body, while the interesting experience of how to hear the sound is greatly changed, it is possible to enjoy by moving the board.

  Another feature of the present invention is that a vibration means for vibrating the board is assembled to the board at a position between the pair of speakers. In this case, for example, an acoustic signal is supplied to the vibration means, and the board vibrates according to the supplied acoustic signal. According to this, low frequency vibration due to vibration of the vibration means and the board is transmitted to the body, and a more interesting experience can be made.

a. First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 schematically shows an entire acoustic apparatus according to the present invention. However, in FIG. 1, the board 10 is shown as viewed from the front. FIG. 2 is a plan view of the board 10. The board 10 is made of a hard material such as wood or synthetic resin (for example, FRP), and is formed in a substantially rectangular plate shape in plan view. A pair of flat speakers 11 a and 11 b are assembled to both ends of the upper surface of the board 10. As the flat speakers 11a and 11b, those having weak directivity to some extent may be used, but those having strong directivity are preferable. A vibration unit 12 for vibrating the board 10 in the vertical direction in FIG. The board 10 is normally supported by a pair of bases 13a and 13b at both ends, and a portion excluding both ends is floating from the floor (or road surface) FL.

  In addition, the acoustic device includes an acoustic signal generator (music signal generator) 14. The acoustic signal generator 14 may be anything as long as it can generate an acoustic signal (particularly a music signal) of a radio, a tape recorder, a CD player, etc., and a musical sound signal synthesized by a computer, a sound source circuit, etc. It may be one that generates a music signal that is a combination of musical sound signals. The acoustic signal from the acoustic signal generator 14 is guided to the flat speakers 11a and 11b via the amplifiers 15a and 15b. The amplifiers 15a and 15b generate acoustic signals having opposite phases and supply them to the flat speakers 11a and 11b, respectively. Specifically, one of the amplifiers 15 a and 15 b outputs the acoustic signal from the acoustic signal generator 14 without changing the phase, and the other amplifier outputs the phase of the acoustic signal from the acoustic signal generator 14. Is converted to a reverse phase and output. In this case, the pair of acoustic signals having opposite phases may be the same acoustic signals that differ only in phase, or may be acoustic signals for the left channel and the right channel in a normal audio device.

  An amplifier 16 is also connected to the acoustic signal generator 14. The amplifier 16 drives the vibration unit 12 by an acoustic signal from the acoustic signal generator 14. In this case, the acoustic signal supplied to the amplifier 16 may be the same as the acoustic signal supplied to the amplifiers 15a and 15b, or an acoustic signal related to the acoustic signal and different from the acoustic signal. Also good.

  In the acoustic apparatus configured as described above, as shown in FIG. 3, a person rides in a standing posture so that the left and right feet are parallel and face the front at a position directly above the vibration unit 12, that is, at the center of the board 10. In this state, the flat speakers 11a and 11b are respectively arranged on the left and right sides of both human feet. Then, the acoustic signal generator 14 is operated to supply acoustic signals to the flat speakers 11a and 11b and the vibration unit 12 via the amplifiers 15a, 15b and 16. The flat speaker 11a, 11b emits sound upward, and the sound emitted upward is blocked by the human body and is difficult to crosstalk. At this time, if a person changes his / her posture on the board 10 such as twisting his / her body or moving his / her face, the left and right ears may hardly hear the sound from one speaker depending on the posture. The percentage of sound that can be heard changes greatly. As a result, according to the first embodiment, moving the body greatly changes the way the sound is heard, making it possible to have an interesting experience.

  Moreover, the vibration unit 12 drives the vibration unit 12 by the supplied acoustic signal, and vibrates the board 10 according to the acoustic signal. Therefore, low-frequency vibrations caused by vibrations of the vibration unit 12 and the board 10 are transmitted to the body, and an even more interesting experience can be achieved.

  Further, in the above description, the human has got on the board 10 so as to face the front of FIG. 3, but the left and right feet are arranged vertically in the longitudinal direction of the board 10 so as to face the left or right of FIG. 3. You may ride on the board 10. In this case, the pair of flat speakers 11a and 11b are respectively arranged on the front side and the back side of both human legs, that is, on the front and back of the body. In the first embodiment, the phases of the acoustic signals supplied to the flat speakers 11a and 11b are opposite to each other, but the phases of the acoustic signals supplied to the flat speakers 11a and 11b are the same. Good. In this case, the change in how the sound is heard is smaller than in the case where the phases are reversed, but a certain change in the way the sound is heard can be enjoyed. The present inventors have confirmed this by experiment.

b. Second Embodiment Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a perspective view of a skateboard SB as an example of the moving device of the present invention.

  The skateboard SB includes a plate-like board 20 that is formed in a long shape in the front and rear directions with a hard material such as wood or synthetic resin (for example, FRP). In FIG. 4 and FIG. 5 to be described later, the arrow direction (right direction in the figure) is the forward direction. A pair of plate-like projecting portions 21 a and 21 b extending from the board 20 obliquely upward and leftward and rightward are formed integrally with the board 20 on both the left and right sides of the center portion in the front-rear direction of the board 20. Speakers 22a and 22b are incorporated in the protruding portions 21a and 21b, respectively, so as to emit sound upward. In this case, it is desirable that the speakers 22a and 22b have strong directivities. A vibration unit 23 for vibrating the board 20 is assembled on the upper surface of the central portion of the board 20 in the front-rear direction. A control box 24 that controls the driving of the skateboard SB and the generation of musical sounds is assembled to the lower surface of the central portion in the front-rear direction of the board 20.

  As shown in FIGS. 4 and 5, the lower surface of the front portion and the rear portion of the board 20 has a cross section opened downward through a pair of first frames 25 and 26 and a pair of second frames 27 and 28. U-shaped arms 31 and 32 are respectively assembled. A front wheel 35 and a rear wheel 36 are rotatably supported by these arms 31 and 32 via a pair of attachment screws 33 and 34 on both the left and right sides. The front wheel 35 and the rear wheel 36 include a tire formed in a substantially cylindrical shape by elastically deformed rubber or resin, and the shape of the outer surface of the tire including the rotation axis is formed in an arc shape at the left and right ends. (See FIG. 8). Slits 31a extending in the front-rear direction are formed in the left and right side pieces of the arm 31 on the front wheel 35 side, and the attachment position in the front-rear direction with respect to the arm 31 of the attachment screw 33, that is, the front-rear attachment position with respect to the arm 31 of the front wheel 35 is adjusted. It is possible. By adjusting the mounting position, the longitudinal distance between the rotation shaft of the front wheel 35 and the rotation shaft of the rear wheel 36 is changed, and the turning performance of the skateboard SB is adjusted.

  Next, a structure for attaching the arms 31 and 32 on the front wheel 35 side and the rear wheel 36 side to the board 20 will be described. Since the mounting structure of the arms 31 and 32 to the board 20 is the same except for the arrangement in the front-rear direction, only the mounting structure of the arm 31 on the front wheel 35 side will be described in detail. FIG. 6 is a cross-sectional view taken along the front-rear direction showing the attachment structure of the arm 31 to the board 20, and FIG. 7 is an exploded perspective view for explaining the attachment structure.

  The first frame 25 is formed in a hollow horseshoe shape, and a plurality of (six in this embodiment) holes 25a penetrating vertically are formed in the peripheral meat portion. The first frame 25 is fixed to the lower surface of the board 20 with screws (not shown). A pair of holes 25b and 25b penetrating in the left-right direction are also formed in the left and right sides of the first frame 25. The second frame 27 has a substantially U-shaped cross section and is elongated in the front-rear direction, and is incorporated in the inner peripheral surface of the first frame 25. A sleeve 27 a extending in the left-right direction is integrally provided on the lower surface of the front portion of the second frame 27. In a state in which the second frame 27 is incorporated in the first frame 25, the columnar connecting shaft 37 is passed through the holes 25b, 25b and the sleeve 27a provided in the first frame 25, whereby the second frame 27 is moved to the first frame 25. The frame 25 is supported so as to be swingable about the axis of the connecting shaft 37. A threaded hole 27b is formed in the lower side surface of the sleeve 27a, and a bottomed hole 37a is formed in the outer peripheral surface of the connecting shaft 37. The threaded hole 27b penetrates the bottomed hole 37a. The connecting shaft 37 is prevented from coming off by the male screw 39.

  On the lower side of the second frame 27, a long holder 38 straddling the second frame 27 in the left-right direction is assembled to the first frame 25 by a pair of male screws 41, 41 (only one shown). . These male screws 41, 41 pass through a pair of through holes 38 a, 38 a provided at both ends of the holder 38 from the lower side and are screwed into a pair of screw holes 25 c, 25 c provided on the left and right sides of the first frame 25. Match. With this structure, the downward swing of the rear portion of the second frame 27 around the axis of the connecting shaft 37 is restricted. In addition, a compression spring 42 having an axial direction in the vertical direction is incorporated between the upper surface of the holder 38 and the lower surface of the second frame 27. By this compression spring 42, the impact applied from the front wheel 35 to the second frame 27 is reduced.

  A rotation support portion 27 c having a cylindrical concave portion on the lower surface side is formed at the center portion in the front-rear direction of the second frame 27. In this cylindrical recess, a cylindrical rotating part 31b integrally formed at the center of the upper surface of the arm 31 is accommodated so as to be rotatable around the axis. A through hole 27c1 is provided at the center of the rotation support portion 27c, and a circular through hole 31b1 is also provided at the center of the rotation portion 31b. A cylindrical rotary shaft 43 passes through these through holes 27c1 and 31b1 from above. The rotating shaft 43 maintains the cylindrical shape as it is at the upper part facing the inner peripheral surface of the through holes 27c1 and 31b1, and the side part is cut off in the axial direction at the lower part located below the through hole 31b1. A pair of parallel side surfaces are formed and male threads are formed on the remaining arc side surfaces. A plate 44 having a fitting hole 44a having the same shape as the cross section of the lower part is fitted into the lower part of the rotating shaft 43. The plate 44 is fitted into a recess 31c formed in a square shape on the lower surface side of the upper wall of the arm 31 so as not to rotate. The nut 45 is screwed onto the lower portion of the rotating shaft 43 from below the plate 44, so that the rotating shaft 43 is fixed to the arm 31 so as to rotate integrally. The plate 44 is fixed to the bottom surface of the recess 31 c of the arm 31 by a male screw 46.

  Thereby, the rotating shaft 43 rotates integrally with the arm 31 around the axis. In order to make this rotation smooth, a bearing 47 is interposed between the upper surface of the rotating portion 31 b of the arm 31 and the lower surface (ceiling surface) of the rotation support portion 27 c of the second frame 27, and A bearing 48 is interposed between the portion and the inner peripheral surface of the through hole 27 c 1 of the rotation support portion 27 c of the second frame 27. A protrusion 31b2 is formed on the side surface of the rotating portion 31b of the arm 31, and a notch 27c2 having a predetermined width is formed on a part of the side wall of the rotating support portion 27c in which the rotating portion 31b is accommodated. . The protrusion 31b2 protrudes outward from the notch 27c2 in a state where the rotation part 31b is accommodated in the rotation support part 27c, and the rotation range of the arm 31 is reduced by the contact of the protrusion 31b2 with the side wall end surfaces on both sides. It has come to be restricted.

  The upper end of the rotating shaft 43 is fixed to one end of the connecting plate 51 by welding. One end of the connection plate 51 is connected to one end of the connection rod 53 via a tension spring 52. The connecting rod 53 is slidably penetrated through a through hole provided in the fixing member 54, and is engaged with the fixing member 54 so as to advance and retract by screwing a nut 53a to a female screw portion provided at the other end. Yes. The fixing member 54 is fixed to the second frame 27 by a pair of male screws 55 and 55 (only one is shown) inserted from the lower surface front end portion of the second frame 27. The connecting plate 51, the tension spring 52, the connecting rod 53, and the fixing member 54 are slidably accommodated in the concave portion on the front side of the second frame 27, and the tension spring 52 is changed by changing the axial position of the connecting rod 53. Thus, the ease of rotation of the rotary shaft 43, that is, the steering characteristics of the front wheels 35 is adjusted.

  A movable element 56a of a potentiometer that constitutes the steering angle sensor 56 is slidably inserted into a hole 51a that engages one end of the tension spring 52 of the connection plate 51. The main body of the steering angle sensor 56 is a board. It is fixed to the lower surface of 20. The movable element 56a is rotationally displaced by the rotation of the rotary shaft 43 and the connecting plate 51, and the steering angle sensor 56 outputs a voltage signal corresponding to the rotational displacement position of the movable element 56a. This voltage signal represents the rotation angle of the rotating shaft 43, that is, the steering angle θ of the front wheel 35, and is hereinafter referred to as a steering angle signal. The steering angle θ represents “0” when the front wheel 35 is in a neutral state (corresponding to a straight-ahead state of a skateboard SB described later). When the front wheel 35 is steered to the left (corresponding to a left turn state of a skateboard SB to be described later), it is negative and represents the leftward steering amount by the magnitude of the absolute value. When the front wheel 35 is steered to the right (corresponding to a right turn state of a skateboard SB to be described later), it is positive and represents the steering amount in the right direction by the magnitude of the absolute value.

  Instead of the steering angle sensor 56, a steering angle sensor 57 provided on the second frame 27 and the arm 31 may be used. The steering angle sensor 57 includes a light emitting element 57a and a light receiving element 57b embedded in the inner peripheral surface of the rotation support portion 27c of the second frame 27 so as to face the outer peripheral surface of the rotation portion 31b of the arm 31, and the rotation portion 31b. It comprises a striped reflective surface 57c provided on the outer peripheral surface. According to the steering angle sensor 57, the light emitted from the light emitting element 57a is reflected by the reflecting surface 57c and received by the light receiving element 57b. If the rotating part 31b rotates, the amount of light received by the light receiving element 57a changes in accordance with the stripe pattern of the reflecting surface 57c, and if the count value is changed in response to the change in the amount of received light, this count value becomes This represents the steering angle θ. In this case, it is necessary to clear the count value to “0” and correct the steering angle zero point with the arm 31 and the front wheel 35 in the neutral position. Furthermore, instead of using light, a steering angle sensor using a magnetic pulse train by a magnet system can be used. In this case, a magnetic pulse train signal may be generated by a combination of an electromagnetic pickup and a plurality of magnets opposed to the electromagnetic pickup. Further, the magnetic pulse train signal may be generated by changing the magnetic permeability of the electromagnetic pickup and the portion facing the electromagnetic pickup at predetermined intervals.

  A circular recess is formed in the lower surface of the rear portion of the first frame 25, and a bottomed cylindrical holder 58 opened downward is fitted into the recess. A circular recess is also formed on the upper surface of the second frame 27 so as to face the holder 58, and a bottomed cylindrical holder 59 opened upward is fitted into the recess. A disc spring 61, a plate 62, and a load sensor 63 are interposed between the holders 58 and 59 in this order from below. The disc spring 61 reduces the impact force transmitted from the front wheel 35 via the second frame 27 and the first frame 25. The plate 62 is made of aluminum and is in contact with the load sensor 63. The load sensor 63 detects a load W1 applied to the second frame 27 from the board 20 via the first frame 25, and outputs a load signal representing the detected load W1. For example, a load cell can be used as the load sensor 63, but any sensor can be used as long as it can detect a load.

  Next, a drive mechanism that rotationally drives the rear wheel 36, which is a drive wheel, will be described with reference to the longitudinal sectional view of FIG. Inside the arm 32 on the rear wheel 36 side, a fixing sleeve 65 having an axis in the left-right direction is fixed by a mounting screw 34. A rotation sleeve 67 is rotatably supported on the outer peripheral surface of the fixed sleeve 65 via bearings 66 and 66. On the outer peripheral surface of the rotating sleeve 67, the rear wheel 36 is assembled so as to rotate integrally with the rotating sleeve 67. The tire of the rear wheel 36 is formed of the same material and shape as the tire of the front wheel 35. An electric motor 68 is accommodated in the fixed sleeve 65. A drive gear 71 is fixed to a rotating shaft 68a of the electric motor 68 so as to rotate integrally. The drive gear 71 meshes with an internal gear 73 serving as an output gear fixed so as to rotate integrally with the inner peripheral surface of the rotary sleeve 67 via the intermediate gear 72. Accordingly, the rear wheel 36 is rotationally driven by the rotation of the electric motor 68. On the arm 32 side, a rotation speed sensor 74 including an encoder that detects the rotation of the rotation sleeve 67 and outputs a rotation speed signal representing the rotation speed V of the rear wheel 36 is assembled. The rotational speed sensor 74 can also use another rotational speed sensor such as picking up the rotation of the gear and outputting a rotational speed signal representing the rotational speed V.

  Further, as described above, the arm 32 on the rear wheel 36 side is attached to the lower surface of the rear portion of the board 20 via the first and second frames 26 and 28 in the same manner as the arm 31 on the front wheel 35 side. A load sensor 75 similar to the load sensor 63 on the front wheel 35 side is incorporated between the first and second frames 26 and 28, and a load representing the load W2 applied to the rear portion of the board 20. Output a signal. However, a steering angle sensor such as the steering angle sensor 56 of the front wheel 35 is not provided on the rear wheel 36 side.

  Next, the electric control device incorporated in the control box 24 will be described. As shown in FIG. 9, the electric control device includes a computer device 80 connected to load sensors 63 and 75, a rotation speed sensor 74, and a steering angle sensor 56 (or 57). The computer device 80 is constituted by a microcomputer incorporating a CPU 80a, a timer 80b, a ROM 80c, and a RAM 80d. Note that a battery as a power source for various electric circuits is not shown. A memory device 81, a motor drive circuit 82, and a sound source circuit 83 are connected to the computer device 80.

  The memory device 81 is configured by a nonvolatile memory such as an EEPROM or a flash memory. This memory device 81 stores various data including music data for generating musical sounds in addition to various programs including the drive control program of FIG. 10 and the musical sound generation control program of FIG. Music data includes automatic rhythm data for automatically generating rhythm sounds, automatic performance data for automatically playing melodies and accompaniments, beat sound data groups for generating beats, and sound effects. Includes sound effect data group.

  The motor drive circuit 82 is controlled by the computer device 80 to drive and control the electric motor 68. The sound source circuit 83 generates a music signal (sound signal) composed of a series of musical sound signals in accordance with an instruction from the computer device 80, and outputs the generated music signal to the speakers 22a and 22b via the amplifiers 84a and 84b. As in the case of the first embodiment, the amplifiers 84a and 84b generate music signals having opposite phases and supply them to the speakers 22a and 22b, respectively. In this case as well, the pair of music signals having opposite phases may be the same music signals that differ only in phase, or may be music signals for the left channel and the right channel in an electronic musical instrument or the like. An amplifier 85 is also connected to the sound source circuit 83. The amplifier 85 drives the vibration unit 23 by the music signal from the sound source circuit 83. In this case, the music signal supplied to the amplifier 85 may be the same as the music signal supplied to the amplifiers 84a and 84b, or a music signal related to the music signal and different from the music signal. Also good.

  The operation of the second embodiment configured as described above will be described. After turning on a power switch (not shown) provided in the control box 24 and performing an initial operation such as music selection, the player gets on the board 20 as shown in FIGS. FIG. 12A is a schematic view of the player riding on the board 20 as viewed from the front, and FIG. 12B is a schematic view of the same as viewed from the right side. In this state, the player moves the body and moves the center of gravity of the body from the upper center position of the board 20 to the front, rear, left and right. In this case, the speakers 22a and 22b are respectively positioned before and after the player's body, that is, before and after both feet.

  At this time, the computer device 80 repeatedly executes the drive control program of FIG. 10 every predetermined short time. Execution of this drive control program is started in step S10, and the computer device 80 inputs the loads W1 and W2 detected by the load sensors 63 and 75 in step S11, respectively. Accordingly, the electric motor 68 is driven and controlled. However, since the input loads W 1 and W 2 are not actually digital values that can be directly used by the computer device 80, they are converted to digital values that can be directly used by the computer device 80 by an interface circuit provided in the computer device 80. Converted as appropriate. In this drive control, if the position of the center of gravity of the player is located above the center of the board 20, the loads W1 and W2 are equal and the electric motor 68 is controlled to stop. When the player moves the center of gravity of the body forward from the center position of the board 20, the load W1 becomes larger than the load W2, and in this case, the electric motor 68 is rotated forward. As the electric motor 68 rotates forward, the rear wheel 36 rotates forward. Since the forward rotation of the rear wheel 36 corresponds to the forward movement of the skateboard SB, the skateboard SB moves forward. On the other hand, when the player moves the center of gravity of the body backward from the center position of the board 20, the load W2 becomes larger than the load W1, and in this case, the electric motor 68 is reversed. By the reverse rotation of the electric motor 68, the rear wheel 36 is also reversed, and the skateboard SB moves backward.

  In addition, when the skateboard SB moves forward and backward, a drive current having a magnitude that increases as the absolute value of the difference between the loads W1 and W2 increases is supplied to the electric motor 68. Therefore, the skateboard SB moves forward with higher acceleration as the player moves the center of gravity of the body forward. As the player moves the center of gravity of the body backward, the skateboard SB moves backward with a large acceleration. In this way, the player can move the center of gravity of the body forward or backward to move the skateboard SB forward, backward, or stop at a desired speed.

  After the process of step S11, the rotational speed V detected by the rotational speed sensor 74 in step S12 is input, and the rotation of the electric motor 68 is limited when the rotational speed V exceeds a predetermined value. Thereby, the forward speed and the reverse speed of the skateboard SB are limited to a predetermined speed or less, and the player can play safely. Then, after the process of step S12, the execution of the drive control program is terminated in step S13.

  Next, a case where turning is performed during skateboard SB traveling will be described. The player moves the weight in the horizontal direction of the board 20 by tilting the body, tilts the board 20 left and right, and turns the skateboard SB. 13A to 13C are schematic views of the state of the board 20, the front wheel 35, and the rear wheel 36 when viewed from above and behind when the skateboard SB is traveling straight, turning left, and turning right. If the player places the center of gravity of the body at the center of the board 20 in the left-right direction, the rotation shaft 43 is in the neutral position, and the front wheel 35 and the rear wheel 36 are in contact with the floor surface FL at their center portions ( (See FIG. 13A). In this case, the skateboard SB goes straight.

  On the other hand, when the player moves the center of gravity of the body in the left direction of the board 20, the front wheel 35 and the rear wheel 36 come into contact with the floor surface FL at their left parts (see FIG. 13B). In this case, the rotating shaft on the front wheel 35 side rotates counterclockwise with respect to the first and second frames 25 and 27 as viewed from above, and the front wheel 35 is steered leftward. On the other hand, the rear wheel 36 is steered in the opposite phase to the front wheel 35. Therefore, the skateboard SB turns left with the position on the left side of the board 20 as the turning center. On the contrary, when the player moves the center of gravity of the body in the right direction of the board 20, the front wheel 35 and the rear wheel 36 come into contact with the floor surface FL at their right parts (see FIG. 13C). In this case, the rotation shaft on the front wheel 35 side rotates to the right with respect to the first and second frames 25 and 27 when viewed from above, and the front wheel 35 is steered in the right direction. On the other hand, the rear wheel 36 is also steered in the opposite phase to the front wheel 35 in this case. Therefore, the skateboard SB turns right with the position on the right side of the board 20 as the turning center.

  In this way, the skateboard SB is turned left and right by the player's left and right weight movement. Then, as the amount of movement of the weight from side to side by the player increases, the ground contact portion of the front wheel 35 and the rear wheel 36 with respect to the floor surface FL moves outward, and the reference of the rotary shaft 43 for the front wheel 35 and the rear wheel 36 is increased. The amount of rotation from the position also increases. Therefore, the turning radius of the skateboard SB during turning is determined by the amount of left and right weight movement.

  Next, generation of a music signal (acoustic signal) by the skateboard SB will be described. The computer device 80 executes the tone generation control program shown in FIG. 11 every predetermined short time in parallel with the drive control program shown in FIG. The execution of the musical tone generation control program is started in step S20, and the rotational speed V from the rotational speed sensor 74 and the steering angle θ from the steering angle sensor 56 are input in step S21. However, since the input rotational speed V and steering angle θ are not actually digital values that can be directly used by the computer device 80, the computer device 80 is provided by an interface circuit provided in the computer device 80 and program processing (not shown). Is appropriately converted into a digital value that can be directly used.

  In step S22, it is determined whether the skateboard SB is running or stopped by determining whether the rotational speed V is greater than or equal to a predetermined value Vo. If the skateboard SB is stopped, the generation of the music signal is controlled to stop at step S23, and the execution of the musical tone generation control program is terminated at step S25. When the skateboard SB starts running, “Yes” is determined in step S22, and generation of a music signal is controlled in accordance with the input rotational speed V and steering angle θ in step S24. In the control of the generation of the music signal, the automatic rhythm data and the automatic performance data are supplied to the sound source circuit 83 as the music progresses, that is, with time. The sound source circuit 83 generates an automatic rhythm sound signal, a melody sound signal, and an accompaniment sound signal based on these data, and outputs the automatic rhythm, melody, and accompaniment automatic performance sound through the amplifiers 84a and 84b to the speakers 22a, 84b. By supplying to 22b, an automatic rhythm sound and an automatic performance sound are generated. The tone generator circuit 83 also supplies these music signals to the amplifier 85, and the amplifier 85 drives the vibration unit 23.

  In the control of the generation of the music signal, the performance tempo of the automatic performance composed of the automatic rhythm performance, the melody and the accompaniment is increased as the rotational speed V, that is, the speed of the skateboard SB increases. Further, the automatic rhythm pattern and the type of automatic performance data are changed according to the change in the motion state of the skateboard SB as described above. Furthermore, the beat sound control data and the sound effect control data are supplied to the sound source circuit 83 according to the change in the motion state of the skateboard SB as described above, and the beat sound and the sound effect together with the automatic rhythm sound, the melody sound and the accompaniment sound. Musical sound signals such as are also generated. In this way, the player can listen to music such as an automatic rhythm sound, an automatic melody sound, and an automatic accompaniment sound while running the skateboard SB, and changes to a music by changing the motion state of the skateboard SB. Can be given. Therefore, it is possible to enjoy a variety of music when the skateboard SB is running. In addition, depending on how the skateboard SB is run, the player can also feel as if he / she is playing a musical instrument by generating beat sounds and sound effects in response to changes in the running state.

  Then, as in the case of the first embodiment, the player moves the body on the board 20 of the skateboard SB, and makes the skateboard SB while having an interesting experience that greatly changes the way the sound is heard. You can enjoy running. The vibration unit 23 vibrates the board 20 according to the generated music signal. Therefore, low-frequency vibrations caused by vibrations of the vibration unit 12 and the board 10 are transmitted to the body, and an even more interesting experience can be achieved.

  In the second embodiment, various modifications can be made as follows. For example, in the second embodiment, the music signal (sound signal) generated by the sound source circuit 83 is guided to the amplifiers 84a, 84b, and 85, respectively. However, instead of this, as in the first embodiment, music signals (acoustic signals) from a radio, music signals (acoustic signals) reproduced by a tape recorder, CD player, etc., are respectively supplied to the amplifiers 84a, 84b, 85. You may make it guide.

  In the second embodiment, the steering angle θ and the rotational speed V (corresponding to the longitudinal speed) are adopted as the motion state quantities of the skateboard SB, and the generation mode of the tone signal is controlled according to these motion state quantities. I tried to do it. However, instead of or in addition to these motion state quantities, the generation mode of the tone signal may be controlled according to the lateral acceleration, lateral velocity, traveling direction, angular velocity around the vertical axis, etc. of the skateboard SB. In this case, the skateboard SB is assembled with sensors for detecting lateral acceleration, lateral speed, traveling direction, angular velocity around the vertical axis, etc., and the sensor output is supplied to the computer device 80. It is preferable to control the generation mode of the musical sound by the left and right speed, the traveling direction, the angular speed around the vertical axis, and the like.

  Further, in the second embodiment, as indicated by a broken line in FIG. 9, a wireless receiver 91 is connected to the computer device 80 and an operation remote box 92 is prepared. The operation remote box 92 has a built-in wireless transmitter and an operation element for instructing the running of the skateboard SB on its operation surface. In this case, the player gives an instruction to accelerate the skateboard SB forward and backward by operating the operation element in place of or in addition to the operation by the load sensors 63 and 75 while riding on the skateboard SB. . This instruction is wirelessly transmitted from the operation remote box 92 and received by the wireless receiver 91. Then, the wireless receiver 91 instructs the computer device 80 to accelerate forward and backward, and the computer device 80 rotates the electric motor 68 according to the instruction by the same process as the process of step S11 of FIG. To control. According to this, the forward and backward acceleration of the skateboard SB is controlled by the operation remote box 92.

  In the second embodiment, the steering of the skateboard SB is controlled by moving the player's weight to the left and right. However, instead of this, an electric steering device that steers at least one of the front wheels 35 and the rear wheels 36 may be employed. In this case, since the skateboard SB is steered to the left and right independently of the player's weight shift, at least one of the front wheels 35 and the rear wheels 36 is paired for running stability of the skateboard SB. It is good to comprise with right and left wheels. According to this, the left / right steering of the skateboard SB is also controlled by the operation remote box 92.

  In the second embodiment, the skateboard SB is driven using the electric motor 68 as a drive source. However, instead of this, the electric motor 68 as a drive source may be eliminated and the skateboard SB may be caused to travel by human power. In this case, the player puts one leg on the board 20 and kicks the running road surface with the other leg to give a rotational force to the front wheel 35 and the rear wheel 36 so that the skateboard SB runs forward and backward. That's fine.

  Furthermore, in the second embodiment, as shown by a broken line in FIG. 4, a road surface sensor 76 and a distance sensor 77 may be provided on the lower surface of the board 20 to detect the state of the traveling road surface of the skateboard SB. The road surface sensor 76 is composed of, for example, a CCD camera, a CMOS camera, etc., and in order to detect the color, shading, etc. of the road surface on which the board 20 travels, the road surface signal 76 is a road surface signal composed of image data PD of the road surface. Is output. The distance sensor 77 is configured by an ultrasonic sensor or the like, detects the distance H from the board 20 to the road surface facing the board 20, and outputs a detection signal representing the distance H.

  In step S24 of FIG. 11, the computer device 80 detects the color, shading, etc. of the traveling road surface detected by the road surface sensor 76 instead of or in addition to the rotational speed V and the steering angle θ, and the distance sensor 77. The distance H can be used to change the generation of the tone signal and the mode of the generated tone signal. In this case, when the skateboard SB is run on a tile floor or a floor with a pattern, a variety of music can be obtained.

c. Third Embodiment Next, a skateboard SB according to a third embodiment of the present invention will be described. This skateboard SB has a long board 100 as shown in the plan view of FIG. 14A and the front view of FIG.

  A relatively large central wheel 102 is rotatably mounted on the lower surface of the central portion of the board 100 via an arm 101. The central wheel 102 is driven by a driving mechanism (see FIG. 5) similar to that of the first embodiment (not shown). The rotation speed V of the central wheel is also detected by a rotation speed sensor (not shown) similar to that in the first embodiment. A relatively small front wheel 105 and rear wheel 106 are rotatably assembled to the lower surface front end portion and rear end portion of the board 100 via arms 103 and 104. The lower surfaces of the front wheel 105 and the rear wheel 106 are provided above the lower surface of the central wheel 102 so that the front wheel 105 and the rear wheel 106 do not contact the road surface at the same time.

  Load sensors 107 and 108 for detecting loads W1 and W2 are embedded in front and rear portions from the center of the upper surface of the board 100. The player places his / her left and right feet at the position where the load sensors 107 and 108 are embedded. Speakers 111 and 112 are embedded in the front end portion and rear end portion of the upper surface of the board 100 so as to face upward. In this case, it is desirable that the speakers 111 and 112 also have strong directivities. In the central portion of the board 100, a control box 113 and a vibration unit 114 are provided that incorporate an electric control device configured in the same manner as in the second embodiment.

  However, in the control box 113, in order to detect the steering angle θ, an angular velocity sensor (gyro sensor) 115 that detects an angular velocity ω around the central position vertical axis of the board 100 and a lateral direction at the front portion of the board 100 are provided. An acceleration sensor 116 that detects the acceleration G is also provided. Then, the steering angle θ is calculated by integrating the detected angular velocity ω, and the zero point (that is, drift) of the calculated steering angle θ is calculated from the change in the traveling direction of the board 100 calculated from the detected lateral acceleration G ( That is, the correction is made based on the inclination angle of the board 100 in the left-right direction). As a result, also in the skateboard SB according to the third embodiment, the same steering angle θ as in the second embodiment can be obtained.

  Also in the skateboard SB configured as described above, as in the case of the second embodiment, if the player places his / her left and right feet on the load sensors 107 and 108 and moves his / her weight forward, the center wheel 102 is moved. Driven forward and accelerated forward, and moving the weight backward, the central wheel 102 is driven reversely and accelerated backward. During forward acceleration of the skateboard SB, the center wheel 102 and the front wheel 105 are in contact with the road surface and the rear wheel 106 is in a floating state. During reverse acceleration, the center wheel 102 and the rear wheel 106 are in contact with the road surface, and the front wheel 105 is in a floating state. When the player moves his / her weight to the center position of the board 100, both the front wheel 105 and the rear wheel 106 are lifted from the road surface, and only the central wheel 102 is in contact with the road surface and runs or stops. Also, in this case, the player turns the body to rotate the board 100 left and right around the vertical axis with the center wheel 102 as a fulcrum, and turns the skateboard SB left and right.

  Therefore, in this state, if the electric control device configured in the same manner as in the second embodiment is operated, the generation of the tone signal and the generation of the tone signal according to the motion state of the skateboard SB are performed as in the case of the second embodiment. The aspect of the tone signal generated is controlled. The board 100 also vibrates according to the musical tone signal. Therefore, also in the third embodiment, the same effect as in the second embodiment can be enjoyed. Also in the third embodiment, various modifications to the second embodiment can be applied. Further, in the third embodiment, the front wheel 105 and the rear wheel 106 may be omitted if the player can balance front and rear and left and right.

d. Fourth Embodiment Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, a snowboard SNB is employed as a mobile device according to the present invention. As shown in FIG. 15, the snowboard SNB has a long board 120, and on the left and right sides of the center part of the board 120 in the front-rear direction, a plate shape extending obliquely upward and leftward from the board 10. A pair of projecting portions 121 a and 121 b are formed integrally with the board 120. Speakers 122a and 122b are incorporated in the protruding portions 121a and 121b, respectively, so as to emit sound upward. In this case, it is desirable that the speakers 122a and 122b have strong directivities. A pair of load sensors 123 and 124 for detecting loads Wlf and Wrt applied in the vertical direction are embedded in the left and right positions of the rear portion of the board 120. In the snowboard SNB, in order to change the direction, the player moves the weight of the hind legs to the left and right. Therefore, by calculating the difference between the detected left and right loads Wlf and Wrt, a rotation angle θs around the vertical axis of the snowboard SNB that is substantially proportional to the difference is obtained (corresponding to the steering angle θ in the first embodiment). be able to.

  A control box 125 is provided at the center of the upper surface of the board 120. The control box 125 houses an acceleration sensor 126 that detects the acceleration G in the front-rear direction of the snowboard SNB. In the control box 125, a computer device 80, a memory device 81, a sound source circuit 83, and amplifiers 84a, 84b, 85 similar to those in the second embodiment are built in (see FIG. 9). Further, the vibration unit 127 driven by the amplifier 85 is also assembled to the board 120 as in the second embodiment.

  The computer device 80 executes the musical tone generation control program shown in FIG. However, in this program, instead of the rotational speed V, the speed Vs of the snowboard SNB calculated by integrating the acceleration G detected by the acceleration sensor 126 is used. Further, instead of the steering angle θ, the rotation angle θs around the vertical axis of the snowboard SNB calculated using the difference between the left and right loads Wlf and Wrt as described above is used.

  In 4th Embodiment comprised in this way, as shown in FIG. 16, a player slides down a snowy mountain on snowboard SNB. In this state, the pair of speakers 122a and 122b are positioned before and after the player. At this time, the snowboard SNB can be turned if the player moves his / her weight to the left or right by twisting his / her body. Therefore, also in the fourth embodiment, the computer device 80 executes the musical tone generation control program of FIG. 11 to generate musical tone signals and musical sounds according to the speed Vs of the snowboard SNB and the rotation angle θs around the vertical axis. While controlling the signal generation mode, the vibration unit 127 and the board 120 are vibrated.

  Therefore, the player can listen to music such as automatic rhythm performance sound, automatic melody sound, automatic accompaniment sound while sliding the snowboard SNB, and change the music by changing the motion state of the snowboard SNB. Can do. Further, depending on how the snowboard SNB is made to slide, the player may have a sense of playing an instrument by generating a beat sound and a sound effect in response to a change in the sliding state.

  Then, the player can slide and enjoy the snowboard SNB while moving his / her body on the board 120 of the snowboard SNB while performing an interesting experience that greatly changes the way the sound is heard. Further, since the vibration unit 127 vibrates the board 120 in accordance with the generated musical sound signal, the player can transmit a low-frequency vibration due to the vibration of the vibration unit 127 and the board 120 to the body and have a more interesting experience.

  In the fourth embodiment, the rotation angle θs around the vertical axis of the snowboard SNB may be detected as in the third embodiment. That is, instead of the load sensors 123 and 124, as in the case of the second embodiment, an angular velocity sensor (gyro sensor) 128 that detects an angular velocity ω around the central position vertical axis of the board 120, and a front portion of the board 120 An acceleration sensor 129 for detecting the lateral acceleration G is provided in the control box 125, and the rotation of the snowboard SNB around the vertical axis is performed based on these sensors 128 and 129 as in the third embodiment. The angle θs may be detected.

  In the fourth embodiment, the speed of the snowboard SNB is calculated using the acceleration G detected by the acceleration sensor 126. Instead of the acceleration sensor 126, the inclination angle of the board 120 with respect to the horizontal plane is detected. An inclination angle sensor may be used. Also by this, since the inclination of the snow surface corresponds to the speed of the snowboard SNB, the same effect as in the above case can be expected. Further, in order to arrange the pair of speakers 122a and 122b on the left and right of the player, the pair of speakers 122a and 122b may be assembled to the upper surfaces of the front end portion and the rear end portion of the board 120. Furthermore, also in this 4th Embodiment, the various deformation | transformation with respect to the said 2nd Embodiment is applicable.

  In implementing the present invention, the present invention is not limited to the first to fourth embodiments and their modifications, and various modifications can be made without departing from the object of the present invention. For example, in place of the skateboard SB and the snowboard, the present invention can be applied to a surfboard, ski, a snow ski with a handle, a motorcycle, a bicycle, a water beagle, an inline skate, and the like.

1 is an overall schematic diagram of an audio device according to a first embodiment of the present invention. It is a top view of a board. It is a front view which shows the state in which the person got on the board. It is the whole skateboard perspective view concerning a 2nd embodiment of the present invention. It is a side view which shows the front part and rear part of a skateboard. It is sectional drawing cut | disconnected along the front-back direction which shows the attachment structure to the board of an arm. It is a disassembled perspective view for demonstrating the attachment structure to the board of an arm. It is a longitudinal cross-sectional view of the rear wheel which is a driving wheel. It is a circuit block diagram which shows the electric control apparatus of a skateboard. 10 is a flowchart showing a drive control program executed by the computer apparatus of FIG. 9. It is a flowchart which shows the musical tone generation control program performed by the computer apparatus of FIG. (A) is the schematic which looked at the state which the player got on the skateboard from the front, (B) is the schematic which looked at the state from the left. (A) is a schematic view seen from above and behind the skateboard when traveling straight, (B) is a schematic view seen from above and behind the skateboard when turning left, and (C) is a right turn. It is the schematic diagram seen from the upper direction and back of the skateboard at the time. (A) is a top view of the skateboard concerning 3rd Embodiment, (B) is a front view of the skateboard. It is a top view of the snowboard which concerns on 4th Embodiment of this invention. It is a figure which shows the sliding state of a snowboard.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Board, 11a, 11b ... Flat speaker, 12 ... Vibration unit, 13 ... Acoustic signal generator (music signal generator), 15a, 15b, 16 ... Amplifier, SB ... Skateboard, 20 ... Board, 22a, 22b ... Speaker, 24 ... Control box, 35 ... Front wheel, 36 ... Rear wheel, 63, 75 ... Load sensor, 56 ... Steering angle sensor, 74 ... Rotational speed sensor, 80 ... Computer device, 83 ... Sound source circuit, 84a, 84b, 85 ... Amplifier, 100 ... Board, 102 ... Center wheel, 105 ... Front wheel, 106 ... Rear wheel, 107,108 ... Load sensor, 111,112 ... Speaker, 113 ... Control box, 114 ... Vibration unit, SNB ... Snowboard, 120 ... Board, 122a, 122b ... Speaker, 123, 124 ... Load sensor, 125 ... Control box, 1 6 ... acceleration sensor, 127 ... vibration unit.

Claims (3)

A board for placing both feet while a human is standing,
A pair of speakers assembled with the human body standing on both sides of the board with the legs standing on both sides of the standing position with the board facing upwards ;
An acoustic apparatus comprising acoustic signal supply means for generating acoustic signals having opposite phases and supplying the acoustic signals to the pair of speakers, respectively . The acoustic device according to claim 1, wherein the board is a board on which a human can ride and move by power or human power . The acoustic apparatus according to claim 1 , further comprising a vibration unit for vibrating the board at a position between the pair of speakers.

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