Percussion instrument and musical sound generation method

Abstract

The invention provides a percussion instrument capable of generating various musical tones and a musical tone generation method. This percussion instrument is provided with an optical sensor (19) that detects the position of a lever (14) between an open (ON) state and a closed (OFF) state (a midway position between the initial position and the terminal position of the lever (14)), and generates musical sound corresponding to the position of the lever (14) detected by the optical sensor (19). Namely, in the open (ON) state of the rod (14), the closed (OFF) state of the rod (14), and each of these states, different musical tones are generated when the drumhead (6) is hit, so that more various musical tones can be generated compared with the prior art in which only musical tones based on the open (ON) or closed (OFF) state of the rod (14) can be generated.

Description

Technical Field

[0001] The present invention relates to a percussion instrument and a method for generating musical sounds, and in particular to a percussion instrument capable of generating various musical sounds and a method for generating musical sounds. Background Art

[0002] For example, Patent Document 1 describes a percussion instrument that can make a snare wire 29 contact or separate from the lower surface of the lower drumhead 22 by rotating a rod 34. In the percussion instrument, a sensor 48 provided on the lower surface of the lower drumhead 22 detects whether the snare wire 29 is in contact with the lower drumhead 22, and when the upper drumhead 21 is struck, different musical sounds are generated when the lower drumhead 22 and the snare wire 29 are in contact or separated. Therefore, various musical sounds can be generated.

[0003] [Prior art literature]

[0004] [Patent Document]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2017-194585 (for example, paragraphs 0019, 0022, Figure 1 , Figure 2 ) Summary of the invention

[0006] [Problems to be solved by the invention]

[0007] However, in the above-mentioned prior art, only two kinds of musical sounds can be generated, namely, the state where the lower drumhead 22 and the sound wire 29 are connected (the rod 34 is in the ON state) and the state where they are separated (the rod 34 is in the OFF state). Therefore, it is not sufficient to generate various musical sounds.

[0008] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a percussion instrument and a method for generating musical sounds that can generate various musical sounds.

[0009] [Technical means to solve the problem]

[0010] In order to achieve the above-mentioned purpose, the percussion instrument of the present invention includes: a struck body, which is struck by a performer; an operating member, which is provided and can rotate in order to adjust the musical sound generated when the struck body is struck; and a first sensor, which detects the position of the operating member between the initial position and the terminal position of the rotational action of the operating member. The percussion instrument can generate information for controlling the musical sound according to the position of the operating member detected by the first sensor.

[0011] The musical sound generating method of the present invention is a musical sound generating method in a percussion instrument, wherein the percussion instrument comprises: a struck body struck by a performer; an operating member rotatably provided for adjusting the musical sound generated when the struck body is struck; and a first sensor for detecting the position of the operating member between an initial position and a terminal position of the rotating action of the operating member, and in the musical sound generating method, musical sound is generated based on the position of the operating member detected by the first sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is an exploded perspective view of a percussion instrument in one embodiment.

[0013] Figure 2 It is a perspective view showing a state where the rod is removed from the bracket.

[0014] Figure 3 It is a partially enlarged cross-sectional view of a percussion instrument.

[0015] Figure 4 It means from Figure 3 A partially enlarged cross-sectional view of a percussion instrument showing a state in which the rod is rotated.

[0016] Figure 5 yes Figure 3 An enlarged cross-section of a portion of the VV line of percussion instruments.

[0017] Figure 6 is a block diagram showing the electrical structure of a percussion instrument.

[0018] Figure 7 is a block diagram showing the structure of a detection circuit.

[0019] Fig. 8A is the flowchart of the initialization process, Figure 8B It is a flowchart of cycle processing.

[0020] Fig. 9 is a flowchart of the rod position detection process.

[0021] Fig.10 This is a flowchart of the musical sound generation process.

[0022] [Explanation of Symbols]

[0023] 1. Percussion

[0024] 2: Shell (frame)

[0025] 4: Drum rim sensor (second sensor)

[0026] 6: Drum head (the object being struck)

[0027] 14: Rod (operating part)

[0028] 144a: Reflective surface

[0029] 16: Rotation axis

[0030] 19: Light sensor (first sensor)

[0031] 190: Light emitting element

[0032] 191: Light receiving element

[0033] 24: Reflective material

[0034] 25: Light-shielding parts

[0035] 270: Control circuit (lighting control unit)

[0036] 272: Holding circuit (storage unit) DETAILED DESCRIPTION

[0037] Hereinafter, preferred embodiments will be described with reference to the accompanying drawings. Figure 1 and Figure 2 The overall structure of the percussion instrument 1 will be described. Figure 1 is an exploded perspective view of a percussion instrument 1 in one embodiment, Figure 2 It is a perspective view showing a state where the rod 14 is removed from the bracket 15 .

[0038] like Figure 1 As shown in FIG. 1 , the percussion instrument 1 is an electronic percussion instrument that imitates an acoustic drum, and includes a shell 2 that constitutes its frame. The shell 2 is formed into a cylindrical shape using metal, wood, or resin. In the following description, the direction around the axis of the shell 2 is described as the circumferential direction, and the direction orthogonal to the axis of the shell 2 is described as the radial direction. A drum head sensor 3 and a drum rim sensor 4 are hooked on the upper edge of the shell 2 (for the drum rim sensor 4, refer to FIG. 1 ). Figure 6 ) for supporting frame 5.

[0039] The frame 5 includes a substantially disc-shaped bottom 50 , a side wall 51 rising upward from the outer edge of the bottom 50 , and a bent portion 52 formed at the upper edge of the side wall 51 . The portions 50 to 52 are integrally formed using a resin material.

[0040] The side wall portion 51 of the frame 5 is formed into a cylindrical shape surrounding the entire circumference of the bottom portion 50, and the curved portion 52 is curved toward the outer circumference from the upper edge of the side wall portion 51. The curved portion 52 is formed into an arc shape (convex upward) along the upper edge of the housing 2, and the frame 5 is supported on the inner circumference of the housing 2 by hooking the curved portion 52 on the upper edge of the housing 2.

[0041] The opening portion of the upper end side of the frame 5 (shell 2) is covered by the drum head 6. The drum head 6 is formed into a disc shape using a net obtained by weaving synthetic fibers, and a circular drum head frame 60 is fixed to the outer edge of the drum head 6. The drum head frame 60 is formed using a resin material, and the drum head 6 and the drum head frame 60 are integrally formed by mold molding. In addition, the drum head frame 60 can also be formed using a material other than resin (for example, a metal such as aluminum or iron), and the drum head frame 60 can be joined to the drum head 6 by bonding or the like.

[0042] The drumhead 6 is fixed to the percussion instrument 1 (frame) through the annular drum rim 7. Through holes (not shown) for inserting the tension bolts 8 are formed at equal intervals in the circumferential direction of the drum rim 7, and multiple (eight locations in this embodiment) drum ears 9 for tightening the tension bolts 8 are provided at equal intervals in the circumferential direction on the outer peripheral side of the shell 2 (frame).

[0043] The drum lug 9 is formed with a female screw hole 90 extending vertically, and the tension bolt 8 is fastened to the female screw hole 90 of the drum lug 9 in a state where the drum head frame 60 of the drum head 6 is hooked on the drum rim 7, thereby applying tension to the drum head 6. As a result, the upper surface of the drum head 6 becomes a striking surface, and the vibration when the striking surface is struck is detected by the drum head sensor 3.

[0044] The drum head sensor 3 includes a central sensor 3a supported by the center of the bottom 50 of the frame 5, and a plurality of (three in this embodiment) peripheral sensors 3b arranged at equal intervals in the circumferential direction on the outer peripheral side of the central sensor 3a. The sensors 3a and 3b are mounted on a plate 10 fixed to the bottom 50 of the frame 5.

[0045] A disc-shaped sensor (not shown in the figure) is bonded to the upper surface of the plate 10 via a cushion pad (not shown) with double-sided tape attached to the front and back, and a cushion pad is bonded to the upper surface of the sensor. The cushion pad and the sensor constitute the central sensor 3a and the peripheral sensor 3b. The cushion pad bonded to the upper surface of the central sensor 3a and the peripheral sensor 3b is a truncated cone-shaped cushion material formed of a flexible material such as sponge, rubber, or thermoplastic elastomer, and the cushion pad is in contact with the lower surface of the drum head 6.

[0046] Although not shown in the figure, a rim sensor 4 (see FIG. 1 ) for detecting a hit on the rim 7 is bonded to the lower surface of the plate 10 supporting the center sensor 3a. Figure 6 The drum edge sensor 4 is a disc-shaped piezoelectric element. When the drum head sensor 3 and the drum edge sensor 4 detect vibration, the sound source 11 (see Figure 6 ) generates a musical sound signal based on the detection result, and outputs the musical sound signal to the amplifier 12 and the loudspeaker 13 (refer to Figure 6) and the electronic musical sound is played from the loudspeaker 13. The percussion instrument 1 is provided with a rod 14 for controlling the timbre and volume of the electronic musical sound. The rod 14 is rotatably mounted on the outer peripheral surface of the housing 2 via a bracket 15.

[0047] like Figure 2 As shown, the bracket 15 includes an outer peripheral wall 150 constituting its outer peripheral surface, and a pair of side walls 151 extending from both ends of the outer peripheral wall 150 in the circumferential direction toward the inner peripheral side (the housing 2 side). The upper ends of the pair of side walls 151 are connected to each other in the circumferential direction by an upper wall 152, and the lower ends are connected to each other in the circumferential direction by a lower wall 153. Each of the walls 150 to 153 of the bracket 15 is formed integrally using metal.

[0048] The bracket 15 has a cavity 154 surrounded by the walls 150 to 153 inside, and an opening 155 connecting the cavity 154 to the outside is formed in the bracket 15. The opening 155 is formed by continuously cutting the outer peripheral wall 150 and the lower wall 153 of the bracket 15, and an insertion hole 156 penetrating the side wall 151 (outer peripheral wall 150) is formed at the lower end side of the opening 155.

[0049] A pair of insertion holes 156 is formed to face each other across the opening 155 , and a cylindrical rotating shaft 16 is inserted into each of the pair of insertion holes 156 . The rod 14 is axially supported by the rotating shaft 16 .

[0050] The lever 14 is formed into a substantially L-shape and includes an operating portion 140 extending vertically and a supported portion 141 protruding from the inner circumferential surface of the lower end side of the operating portion 140. Axial holes 142 are formed on both side surfaces of the supported portion 141 in the circumferential direction.

[0051] When the rod 14 is mounted on the bracket 15, the supported portion 141 is inserted from the opening 155 toward the cavity 154 inside the bracket 15, and in the inserted state, the rotating shaft 16 passing through the insertion hole 156 is inserted into the shaft hole 142 of the rod 14. Then, the rotating shaft 16 inserted into the shaft hole 142 is fixed to the bracket 15 (insertion hole 156) by a headless set screw (not shown), whereby the rod 14 is supported by the bracket 15 so as to be rotatable.

[0052] Then, refer to Figure 2 to Figure 4 The structure for rotating the rod 14 will be described in detail. Figure 3 is a partially enlarged cross-sectional view of a percussion instrument 1, Figure 4 It means from Figure 3 The enlarged cross-sectional view of the percussion instrument 1 is a partial view showing the state in which the rod 14 is rotated. Figure 3 and Figure 4, the figure shows a cross section cut along a plane orthogonal to the axial direction of the rotating shaft 16, that is, a plane including the optical sensor 19 (the optical axis of the light irradiated by the light projecting element 190). Figure 3 and Figure 4 In the figure, the rotating shaft 16 hidden by the rod 14 is illustrated by a dotted line, and a part of the internal structure of the bracket 15 (for example, Figure 5 The support wall 159 is shown schematically.

[0053] like Figure 2 and Figure 3 As shown, in a state where the rod 14 is axially supported by the rotating shaft 16, the supported portion 141 of the rod 14 protrudes from the rotating shaft 16 toward the cavity 154 of the bracket 15. In the supported portion 141, an insertion hole 143 having an opening is formed at its front end (end on the inner peripheral side), and a pin 17 as a plunger is inserted into the insertion hole 143.

[0054] The pin 17 includes a cylindrical portion 170 inserted into the insertion hole 143, and an axial end side ( Figure 3 The roughly hemispherical blocking portion 171 that is blocked on the right side of the housing 170, 171, and the parts 170, 171 are formed integrally.

[0055] The coil spring 18 is inserted into the inner peripheral side of the cylinder 170, and the coil spring 18 applies elastic force to the pin 17 in the direction of protruding from the insertion hole 143 (in the direction orthogonal to the axial direction of the rotating shaft 16). The blocking portion 171 of the front end portion of the pin 17 is pressed against the sliding wall 157 of the bracket 15 by the elastic force. The sliding wall 157 is formed with a first concave surface 157a, a convex surface 157b connected to the upper edge of the first concave surface 157a, and a second concave surface 157c connected to the upper edge of the convex surface 157b.

[0056] When the cross section is observed after being cut on a plane perpendicular to the axial direction of the rotating shaft 16, the first concave surface 157a and the second concave surface 157c are formed into a curved shape that is concave in the direction away from the rotating shaft 16. In addition, when the cross section is observed, the convex surface 157b is formed into a curved shape that is convex toward the rotating shaft 16 side, and these concave and convex surfaces 157a to 157c are smoothly continuous from the lower end side to the upper end side of the sliding wall 157. In the state where the blocking portion 171 of the pin 17 is pressed against the first concave surface 157a, the operating portion 140 of the lever 14 is in a posture extending in the up-down direction (vertical direction).

[0057] like Figure 3 and Figure 4As shown in the figure, the lever 14 is rotated about the rotation axis 16 in such a manner that the operation portion 140 is lowered from the state where the blocking portion 171 of the pin 17 is pressed against the first concave surface 157a, and thereby the blocking portion 171 of the pin 17 slides in such a manner that it rides on the convex surface 157b. At this time, inside the insertion hole 143 of the supported portion 141, the pin 17 slides in the direction in which the coil spring 18 is compressed, so that the hand feeling when the lever 14 is lowered can be felt.

[0058] When the rod 14 is rotated until the blocking portion 171 passes over the apex of the convex surface 157b, the pin 17 is extended from the insertion hole 143 by the elastic force of the coil spring 18, and the blocking portion 171 is pressed against the second concave surface 157c. When the blocking portion 171 is pressed against the second concave surface 157c, the operating portion 140 of the rod 14 is tilted relative to the vertical direction. When the tilted rod 14 is rotated around the rotation axis 16 in an upright manner, the blocking portion 171 slides along the sliding wall 157 and is pressed against the first concave surface 157a by an action opposite to that when the rod 14 is laid down.

[0059] As described above, the lever 14 is configured to be capable of being raised at the position of the operation portion 140 ( Figure 3 state) and the position of the tilting operation unit 140 ( Figure 4 Although the percussion instrument 1 of this embodiment is not equipped with a drum wire like an acoustic snare drum, by rotating the rod 14 in the laid-down state in an upright manner, it is possible to simulate the movement of the drum wire and the lower drumhead (installed in the same Figure 1 The operation of contacting the drum head with the opening portion of the shell on the opposite side of the drum head 6 shown in the figure. On the other hand, by performing the opposite operation, the operation of removing the drum wire from the lower drum head can be simulated.

[0060] In the following description, the state in which the rod 14 is erected (the blocking portion 171 is pushed to the position of the first concave surface 157a) is defined as Figure 3 The state of the lever 14 being opened (ON) is defined as the state of the lever 14 being laid down (the blocking portion 171 is pushed to the second concave surface 157c). Figure 4 The state of the lever 14 is described as being in a closed (OFF) state.

[0061] The position of the rod 14 (rotation angle of the rod 14) within the movable range between the opening (ON) and the closing (OFF) is detected by the optical sensor 19. A substrate 20 is fixed inside the bracket 15, and the optical sensor 19 is mounted on the lower surface of the substrate 20. The optical sensor 19 includes a light-emitting element 190 for irradiating light downward and a light-receiving element 191 for receiving the light. Figure 5 ).

[0062] The detected portion 144 protrudes from the inner peripheral surface of the operating portion 140 toward the inner peripheral side, and the upper surface of the detected portion 144 is configured as a flat reflective surface 144a. Figure 3 In the state of the optical sensor 19 and the reflecting surface 144a, the light irradiated from the light projecting element 190 of the optical sensor 19 is reflected by the reflecting surface 144a and received by the light receiving element 191 (refer to Figure 5 )take over.

[0063] like Figure 3 and Figure 4 As shown, when the rod 14 is rotated from the open (ON) state to the closed (OFF) state, the amount of light reflected from the reflection surface 144a toward the light receiving element 191 (received by the light receiving element 191) decreases, and on the other hand, when the rod 14 is rotated from the closed (OFF) state to the open (ON) state, the amount of light reflected from the reflection surface 144a toward the light receiving element 191 increases. The optical sensor 19 outputs an output value corresponding to the change in the amount of light received by the light receiving element 191, and the position of the rod 14 is detected based on the output value of the optical sensor 19. When playing with the percussion instrument 1, various operations are performed using the rod 14. A playing method using the percussion instrument 1 will be described.

[0064] First, the performer operates the switch 21 fixed to the upper surface of the base plate 20 to perform various settings in the percussion instrument 1. The various settings include the setting of the output level (volume) of the musical sound signal, the setting of turning on / off the effect given to the musical sound, the setting of the drum set (the type of musical sound generated), etc. An example of the setting of the drum set is described below.

[0065] The switch 21 includes an operating portion 210 for the performer to press or rotate, and is used to penetrate the upper wall 152 of the bracket 15 through the through hole 158 of the operating portion 210. By operating the operating portion 210, when the mode of the percussion instrument 1 is set to the drum set change mode, the rod 14 is rotated between the open (ON) state and the closed (OFF) state, so that the drum set can be selected.

[0066] On the outer edge side of the substrate 20 ( Figure 3 , Figure 4A light emitting diode (LED) or the like is provided at the left side of the base 20, and the light emitting diode 22 emits light in a color corresponding to the drum set selected by the performer. In other words, the light emitting diode 22 emits light in a color corresponding to the position of the rod 14. The light emitting diode 22 is fixed to the upper surface of the base 20, and a lens 23 is fixed to the corner where the outer peripheral wall 150 of the bracket 15 intersects with the upper wall 152, so that the light of the light emitting diode 22 is transmitted to the outside. By visually recognizing the light of the light emitting diode 22 coming out of the lens 23, the type of the selected drum set can be confirmed.

[0067] After selecting the drum set, the operation unit 210 is operated to complete various settings (for example, the mode of the percussion instrument 1 is set to the performance mode). Figure 4 Turn it to the ON state ( Figure 3 In the case of the lever 14 being turned from the on state to the off state, the sound of the sound wire coming into contact with the lower drumhead is generated. On the other hand, when the lever 14 is turned from the on state to the off state, the sound of the sound wire coming away from the lower drumhead is generated. Of course, even if the drumhead 6 or the rim 7 is not struck (see Figure 1 ), also generates this kind of sound that imitates the touch and leave sound of a drum line.

[0068] In addition, in the present embodiment, the speed of the rod 14 is calculated based on the temporal change of the output value of the optical sensor 19 (i.e., the position of the rod 14), and a musical sound corresponding to the speed is also generated. For example, when the rod 14 is operated from the closed (OFF) state to the open (ON) state at a relatively fast speed, the contact sound between the lower drumhead and the drum wire is generated at a relatively large volume. On the other hand, when the rod 14 is operated from the closed (OFF) state to the open (ON) state at a speed slower than the speed, the contact sound is generated at a relatively small volume. By generating the contact and separation sound of the drum wire when the rod 14 is operated as described above, the percussion instrument 1 can be used to imitate an original snare drum.

[0069] In addition, when the lever 14 is in the ON state, the drum head 6 or the drum edge 7 is struck (see Figure 1 ), a striking sound (electronic musical sound) is generated when the drum line contacts the lower drum head. On the other hand, when the drum head 6 is struck with the rod 14 in the closed (OFF) state, a striking sound is generated when the drum line leaves the lower drum head.

[0070] Furthermore, in the present embodiment, when the drumhead 6 is struck when the rod 14 is between the open (ON) state and the closed (OFF) state, a musical sound with a more different timbre is generated. The musical sound with a more different timbre may be a musical sound produced when the drumhead 6 is struck with effects (acoustic effects) such as reverberation, delay, and vibrato, or a musical sound with a different timbre or volume from the musical sound produced when the drumhead 6 is struck. In addition, musical sounds with different effects are generated when the rod 14 is operated at a relatively fast speed while striking the drumhead 6 and when the rod 14 is operated at a relatively slow speed while striking the drumhead 6.

[0071] As described above, in the present embodiment, the optical sensor 19 is provided to detect the position of the rod 14 between the state in which the rod 14 is on (ON) and the state in which it is off (OFF) (the intermediate position between the initial position and the terminal position of the rod 14), and musical sounds corresponding to the position of the rod 14 detected by the optical sensor 19 are generated. That is, different musical sounds are generated when the drumhead 6 is struck in each of the states in which the rod 14 is on (ON), the state in which it is off (OFF), and the states between these states, so that more diverse musical sounds can be generated compared to the prior art that can only generate musical sounds based on the state in which the rod 14 is on (ON) or off (OFF). Furthermore, the speed of the rod 14 can be detected based on the temporal change in the position of the rod 14, so that different musical sounds can be generated based on the speed, thereby generating more diverse musical sounds.

[0072] Here, the position of the rod 14 can also be detected using a magnetic sensor, but in the case of such a structure, there is a concern that other surrounding metal parts (magnetic bodies) may interfere with the magnetism of the magnetic sensor.

[0073] In contrast, in the present embodiment, the position of the rod 14 is detected by the optical sensor 19, which includes a light projecting element 190 that irradiates light toward the reflective surface 144a of the rod 14 and a light receiving element 191 that receives light reflected from the reflective surface 144a. With such a structure, unlike the case of using a magnetic sensor, it is possible to suppress the adverse effects of other surrounding metal parts (magnetic bodies) on the position detection of the rod 14 by the optical sensor 19. Therefore, the position of the rod 14 can be detected with good accuracy.

[0074] As another method of detecting the position of the rod 14 using the optical sensor 19, a structure in which the reflective surface of the rod 14 is displaced in the optical axis direction of the optical sensor 19 (light-projecting element 190) can be adopted. As such a structure, for example, the following structure can be exemplified: the front end surface (toward the end) of the detection portion 144 is displaced. Figure 3 The right side of the reflective surface is set as a reflective surface, and the direction substantially orthogonal to the reflective surface ( Figure 3In the case of such a structure, the upper and lower width dimensions of the reflecting surface (the thickness of the detected portion 144) are large enough to reflect the light from the optical sensor 19.

[0075] However, if the reflective surface of the rod 14 is displaced in the optical axis direction of the optical sensor 19, the output value of the optical sensor 19 will drop sharply when the detected portion 144 (reflective surface) rotates away from the optical sensor 19. Therefore, the range of the detectable position of the rod 14 is likely to be narrowed.

[0076] In contrast, in the present embodiment, when the lever 14 is in the open (ON) state ( Figure 3 In the state of being opened (ON), the reflection surface 144a of the detected part 144 is orthogonal to the optical axis of the optical sensor 19. When the rod 14 is rotated from the state to the closed (OFF) state, the reflection surface 144a is displaced (rotated) in a direction substantially orthogonal to the optical axis direction of the optical sensor 19 (light-projecting element 190). By displacing the reflection surface 144a in this direction, when the rod 14 is rotated from the open (ON) state to the closed (OFF) state, the area of ​​the reflection surface 144a that reflects the light of the optical sensor 19 (hereinafter referred to as "the reflection area of ​​the reflection surface 144a") can be gradually reduced. On the other hand, when the rod 14 is rotated in the opposite direction, the reflection area of ​​the reflection surface 144a can be gradually increased.

[0077] By increasing or decreasing the reflection area of ​​the reflection surface 144a as the rod 14 rotates as described above, the output value of the optical sensor 19 is less likely to increase or decrease sharply compared to the case where the reflection surface is displaced in the optical axis direction of the optical sensor 19 as described above. Therefore, the detection range of the position of the rod 14 can be widened, and the position of the rod 14 can be detected with good accuracy.

[0078] In addition, in the present embodiment, the axis of the rotating shaft 16 (the rotation center of the rod 14) is orthogonal to the optical axis of the optical sensor 19 (the rotating shaft 16 is located on the extension line of the optical axis of the optical sensor 19). Figure 3 Compared with the structure shown in FIG. 1 (the position further to the left in FIG. 1 ), the position of the rod 14 and the reflection area of ​​the reflection surface 144a (the output value of the optical sensor 19) are likely to increase or decrease in proportion. Therefore, the position of the rod 14 can be detected with further good accuracy.

[0079] In addition, a reflective material 24 is attached to the reflective surface 144a of the detected portion 144. Although not shown in the figure, the reflective material 24 includes a resin layer formed using a film made of resin (for example, polyethylene terephthalate (PET)) and a metal layer made of metal (for example, aluminum) laminated on the resin layer. The metal layer is formed by laminating a metal foil on the resin layer or applying a metal to the resin layer by vapor deposition or the like. The metal layer is laminated between the reflective surface 144a and the resin layer, and the upper surface of the metal layer is covered by the resin layer, so that damage to the metal layer can be suppressed.

[0080] By attaching such a reflective material 24 to the reflective surface 144a, the amount of light reflected from the reflective surface 144a (reflective material 24) toward the light receiving element 191 can be adjusted. As a result, the light receiving element 191 can receive light of an appropriate amount of light, so that the increase or decrease of the reflective area of ​​the reflective surface 144a accompanying the rotation of the rod 14 can be detected with high accuracy by the light receiving element 191. Therefore, the position of the rod 14 can be detected with high accuracy.

[0081] As described above, in this embodiment, the position of the rod 14 is detected based on the amount of light received by the light receiving element 191 of the optical sensor 19. Therefore, when the light receiving element 191 receives external disturbance light, the position of the rod 14 cannot be detected with good accuracy. The external disturbance light includes light that is pulsed at a predetermined frequency (flickering at high speed) such as LED lighting, or light that is continuously lit without flickering such as sunlight or electric light.

[0082] In contrast, in this embodiment, the details will be described below, but the structure is such that the detection circuit 27 (see Figure 7 ) to flash the light projecting element 190 of the optical sensor 19 at high speed (for example, lighting up at 0.4 ms intervals). This makes it possible to distinguish whether the light received by the light receiving element 191 is the light of the light projecting element 190 or external disturbance light such as sunlight that is continuously lit.

[0083] On the other hand, the external interference light such as LED lighting flashes at high speed like the light projecting element 190, but the LED lighting is lit in the wavelength region of visible light. In contrast, the light projecting element 190 of this embodiment uses an element that is lit at a wavelength outside the visible light region (near infrared light). Therefore, it can be distinguished whether the light received by the light receiving element 191 is the light of the light projecting element 190 or the external interference light such as LED lighting.

[0084] Although external disturbance light and the light of the light projecting element 190 can be distinguished by flashing the light projecting element 190 at high speed or lighting it at a wavelength outside the visible light region as described above, in order to detect the position of the rod 14 with further accuracy, it is preferable not to irradiate the light receiving element 191 with external disturbance light as much as possible. Figure 3 , Figure 5 The following mainly describes the light shielding component 25 for shielding the external disturbance light, but reference is also made to Figure 2 to explain. Figure 5 yes Figure 3 A partially enlarged cross-sectional view of the percussion instrument 1 of the VV line.

[0085] like Figure 3 and Figure 5 As shown, the light receiving element 191 of the optical sensor 19 (see Figure 5 ) is oriented toward the lower surface side of the substrate 20. Therefore, the light of the illumination or the like provided on the top side is shielded by the substrate 20 or the upper wall 152 of the bracket 15, so that the light receiving element 191 can be prevented from erroneously detecting such external disturbance light.

[0086] On the other hand, the lower wall 153 (see Figure 3 ) side is formed with an opening 155 for inserting the supported portion 141 of the rod 14, and the rod 14 is axially supported by the rotating shaft 16 provided in the opening 155. A gap is formed between the supported portion 141 and the opening 155 around the rotating shaft 16 (the movable part of the rod 14), so that light reflected by the ground or the like may enter through the gap. External disturbance light from the ground side is blocked by the light shielding component 25.

[0087] The light shielding component 25 includes a lower wall portion 250 for covering the detection portion 144 of the rod 14 from below, and a side wall portion 251 rising upward from both ends of the circumferential direction of the lower wall portion 250. The inner wall portion 252 extends from the inner circumferential side ( Figure 3 The end portion (on the right side) stands upward, and the inner wall portion 252 connects a pair of side wall portions 251 to each other.

[0088] A pair of protruding portions 253 (see Figure 5 ) extends from the side surface of the upper end side of the pair of side wall portions 251 to both sides in the circumferential direction, and a substantially L-shaped claw portion 254 is formed at the lower end of each of the pair of side wall portions 251 (for the aspect that the claw portion 254 is formed in an L-shape, refer to Figure 2 ). Each wall portion 250 to 254 of the light shielding component 25 is integrally formed using an elastic body such as rubber or an elastic material. The light shielding component 25 is mounted on the support wall 159 of the bracket 15 using the extension portion 253 and the claw portion 254 (see Figure 5 ).

[0089] The support wall 159 is an L-shaped wall protruding from the inner surface of the side wall 151 of the bracket 15. The support wall 159 is formed on each of the pair of side walls 151, and the light shielding component 25 is installed inside the bracket 15 by hooking the extension 253 and the claw 254 of the light shielding component 25 on the pair of support walls 159.

[0090] like Figure 3 As shown, when viewed in the axial direction of the rotating shaft 16, a lower wall portion 250 of the light shielding component 25 is disposed between the optical sensor 19 and the rotating shaft 16. Figure 5 As shown, when the lever 14 is in the ON state (the light of the optical sensor 19 is irradiated to the reflecting surface 144a), the reflecting surface 144a of the lever 14 is located between the optical sensor 19 (light receiving element 191) and the light shielding component 25 (lower wall portion 250). Thus, even if a gap is formed between the supported portion 141 of the lever 14 and the opening 155 of the bracket 15 around the rotating shaft 16, the lower wall portion 250 of the light shielding component 25 can be used to block external disturbance light entering from the gap. Therefore, it is possible to suppress the light receiving element 191 from receiving external disturbance light, so that the position of the lever 14 can be detected with good accuracy.

[0091] When the lever 14 is in the open (ON) state, the side wall portion 251 and the inner wall portion 252 (see Figure 3 ) protrudes upward (toward the optical sensor 19) from the reflecting surface 144a, and the reflecting surface 144a is surrounded by the wall portions 251 and 252. Thus, even if external disturbance light enters the interior of the bracket 15, the external disturbance light irradiated to the reflecting surface 144a can be shielded by the wall portions 251 and 252. Therefore, the light receiving element 191 can be prevented from receiving external disturbance light, so the position of the rod 14 can be detected with good accuracy.

[0092] As described above, the external disturbance light irradiated from the lower side of the bracket 15 can be roughly shielded by the light shielding part 25. In addition, as described above, the external disturbance light from the upper side of the bracket 15 is also roughly shielded by the substrate 20 or the upper wall 152 of the bracket 15. On the other hand, it is difficult to completely shield the external disturbance light that reaches the light receiving element 191, such as the external light that intrudes into the bracket 15 through reflection from the rod 14 or the external light that intrudes into the bracket 15 directly (for example, through the opening 155).

[0093] In contrast, in the present embodiment, a structure is provided that can suppress erroneous detection of the position of the rod 14 due to external disturbance light received by the light receiving element 191. Figure 6 and Figure 7 The above structure will be described. Figure 6 is a block diagram showing the electrical structure of the percussion instrument 1. Figure 7 : is a block diagram showing the structure of the detection circuit 27.

[0094] like Figure 6As shown, the percussion instrument 1 includes a control device 26 for controlling various parts of the percussion instrument 1. The control device 26 has a central processing unit (CPU) 260, a flash read-only memory (ROM) 261, and a random access memory (RAM) 262, which are connected via a bus 263. The CPU 260 is a computing device that controls various parts connected via the bus 263. The drumhead sensor 3, the drum edge sensor 4, the detection circuit 27, and the sound source 11 are respectively connected to the bus 263. The detection circuit 27 is for controlling the rod 14 (refer to Figure 3 and Figure 4 ) position. In addition, the sound source 11 can be connected to the percussion instrument 1 in a wireless manner.

[0095] like Figure 7 As shown in FIG. 1 , the detection circuit 27 includes a control circuit 270 for controlling the lighting of the light-emitting element 190 of the optical sensor 19. As described above, the light irradiated from the light-emitting element 190 is reflected by the detection portion 144 (reflection surface 144a) of the rod 14 and received by the light-receiving element 191. The optical sensor 19 outputs an output value corresponding to the amount of light received by the light-receiving element 191 to the conversion circuit 271.

[0096] The control circuit 270 flashes the light-emitting element 190 of the optical sensor 19 at a predetermined interval (for example, lights up at intervals of 0.4 milliseconds), and connects the conversion circuit 271 to the holding circuit 272 when the light-emitting element 190 is turned off. The conversion circuit 271 converts the current value (output value) output from the light-receiving element 191 when the light-emitting element 190 is turned off into a voltage value and outputs it to the holding circuit 272. The output value output by the light-receiving element 191 when the light-emitting element 190 is turned off (hereinafter referred to as "output value when turned off") is a value indicating the light amount of external disturbance light.

[0097] On the other hand, when the light projecting element 190 is turned on, the control circuit 270 disconnects the conversion circuit 271 from the holding circuit 272, and the conversion circuit 271 converts the current value (output value) output from the light receiving element 191 when the light projecting element 190 is turned on into a voltage value and outputs it to the calculation circuit 273. The output value output by the light receiving element 191 when the light projecting element 190 is turned on (hereinafter referred to as "output value when turned on") is a value indicating the total amount of the external disturbance light and the reflected light from the detection unit 144.

[0098] Then, the operation circuit 273 subtracts the output value at the time of extinguishing held in the holding circuit 272 from the output value at the time of lighting, and outputs the correction value obtained by the subtraction as a value indicating the position of the rod 14 to the CPU 260. Thus, the output value corresponding to the amount increased by the external disturbance light can be subtracted from the output value of the optical sensor 19, so that the position of the rod 14 can be prevented from being erroneously detected due to the influence of the external disturbance light (the position of the rod 14 can be detected with good accuracy).

[0099] Here, as described above, when the lever 14 rotates from the open (ON) state to the closed (OFF) state, the detected portion 144 (reflecting surface 144a) gradually appears outside the bracket 15 (see Figure 3 and Figure 4 ), so the amount of external disturbance light received by the light receiving element 191 tends to be larger when the lever 14 is in the closed (OFF) state than when the lever 14 is in the open (ON) state. That is, the amount of external disturbance light changes according to the position of the lever 14.

[0100] In contrast, in the present embodiment, the light projecting element 190 flashes at a very high speed (lights up at intervals of 0.4 milliseconds), and when the light projecting element 190 is lit, the output value of the light projecting element 190 when it is turned off (when it was turned off last time) is held in the holding circuit 272. The output value of the light projecting element 190 when it is turned off immediately before it is turned on is roughly consistent with the amount of external disturbance light actually received by the light receiving element 191 when the light projecting element 190 emits light, so by subtracting the output value of the light projecting element 190 when it is turned off from the output value when it is turned on, the output value of the optical sensor 19 can be accurately corrected (the increase in the output value caused by the external disturbance light can be accurately subtracted). Therefore, it is possible to suppress the erroneous detection of the position of the rod 14 due to the influence of the external disturbance light (the position of the rod 14 can be detected with good accuracy).

[0101] In addition, the control circuit 270 turns on the light projecting element 190 for a shorter time (e.g., 0.1 msec) than the extinguishing time (e.g., 0.3 msec) of the light projecting element 190, thereby reducing the power loss of the optical sensor 19 and increasing the life of the optical sensor 19 (light projecting element 190).

[0102] Back to Figure 6 The flash ROM 261 of the control device 26 is a non-volatile storage device that stores programs executed by the CPU 260 or fixed value data and can be overwritten. The flash ROM 261 stores a control program 261a executed by the CPU 260. The RAM 262 is a memory for storing various work data or flags in an overwritable manner when the control program 261a is executed.

[0103] When the control program 261a is executed by the CPU 260, the initialization process and the periodic process described later (see Figure 7 and Fig. 8A , Figure 8B The details of these processes will be described below. The percussion instrument 1 outputs a sound generation instruction corresponding to the detection results of the drumhead sensor 3, the drum edge sensor 4 and the detection circuit 27 from the CPU 260 to the sound source 11 (generating information for controlling the musical sound generated by the sound source 11 according to the position of the rod 14 detected by the optical sensor 19).

[0104] The sound source 11 is a device that controls the timbre or various effects of musical sounds (percussion sounds) according to the sound generation instruction from the CPU 260. The sound source 11 has a built-in digital signal processor (DSP) 110 that performs calculations such as filtering of waveform data or applying effects. The sound source 11 is connected to an amplifier 12, and the amplifier 12 is connected to a loudspeaker 13. The musical sound signal processed by the sound source 11 is amplified by the amplifier 12, and the loudspeaker 13 plays the musical sound based on the amplified musical sound signal.

[0105] The RAM 262 is provided with a rod position memory 262a, a rod state flag 262b, a mask processing flag 262c, and a mask time counter 262d.

[0106] The position of the rod 14 detected by the detection circuit 27 (the correction value of the output value of the optical sensor 19) is stored in the rod position memory 262a in a time series. For example, the position of the rod 14 corresponding to the past 5 milliseconds is stored in the rod position memory 262a, and the operation speed of the rod 14 can be calculated based on the position of the rod 14 stored in the time series.

[0107] The lever state flag 262b indicates whether the lever 14 is in an open (ON) state or a closed (OFF) state, and the masking process flag 262c indicates whether the masking process is in progress. The masking process is a process for preventing the generation of erroneous musical sounds due to vibration when the lever 14 is operated.

[0108] More specifically, the rod 14 is mounted on the housing 2 via the bracket 15 as described above (see Figure 1), so the vibration when the lever 14 is operated to the open (ON) state or the closed (OFF) state (the end position of the movable range) or the vibration during the operation of the lever 14 (when the lever 14 rotates in the middle of the movable range) is transmitted to the shell 2. When the vibration transmitted to the shell 2 is detected by the rim sensor 4, there is a concern that the same musical sound as when the rim 7 is struck (hereinafter referred to as "the striking sound of the rim 7") is emitted. That is, regardless of whether the lever 14 is operated, there is a possibility that the striking sound of the rim 7 is mistakenly generated.

[0109] The vibration transmitted to the shell 2 when the lever 14 is operated is usually smaller than when the player hits the rim 7. Therefore, in the present embodiment, when the lever 14 is operated, the masking process is started, and during the predetermined time period of executing the masking process, the sound of hitting the rim 7 generated based on the detection result of the rim sensor 4 (the sound of hitting the rim 7 is relatively small) is canceled. In this way, the sound of hitting the rim 7 generated by the vibration when the lever 14 is operated can be suppressed.

[0110] The masking process ends after a predetermined time has passed since its start, but the counter indicating whether the masking process time has passed is the masking time counter 262d. Fig. 8A , Figure 8B to Figure 10 The control of musical sound generation including the masking process will be described.

[0111] First, refer to Fig. 8A , Figure 8B The initialization process and the cycle process of the percussion instrument 1 will be described. Fig. 8A is a flowchart showing the initialization process, Figure 8B It is a flowchart showing the cycle processing. Fig. 8A The initialization process shown is executed immediately after the percussion instrument 1 is powered on.

[0112] like Fig. 8A As shown, in the initialization process, the lever state flag 262b is set to OFF (S1), and the masking process flag 262c is set to OFF (S2). Then, "0" is set in the masking time counter 262d, and a series of processes are terminated.

[0113] Figure 8B The cycle processing shown is repeated in units of 0.1 milliseconds by interrupting the processing at intervals of 0.1 milliseconds after the initialization processing. In the cycle processing, the rod position detection processing (S4) for detecting the position of the rod 14 and the musical sound generation processing (S5) for controlling the sound generation based on the detection results of the drumhead sensor 3, the drum edge sensor 4 and the detection circuit 27 are sequentially implemented. Fig. 9 and Fig.10 These processes are described. Fig. 9 is a flowchart showing the rod position detection process (S4), Fig.10 This is a flowchart showing the musical sound generation process (S5).

[0114] like Fig. 9 As shown, in the rod position detection process of S4, the position of the rod 14 (hereinafter referred to as "rod position") is acquired from the detection circuit 27 and stored in the rod position memory 262a (S10). As described above, the operation speed of the rod 14 can be calculated based on the position of the rod 14 corresponding to the past 5 milliseconds stored in the rod position memory 262a.

[0115] After S10, it is confirmed whether the current lever position obtained in S10 is ON (S11). When the current lever position is ON (S11: Yes), in order to confirm whether the lever position is operated from OFF to ON, it is confirmed whether the lever state flag 262b is OFF (S12).

[0116] When the lever state flag 262b is OFF (S12: Yes), the lever state flag 262b is set to ON (S13). When the lever state flag 262b is set from OFF to ON, the mask processing flag 262c is set to OFF (S14) because the lever operation is completed. On the other hand, in the process of S12, when the lever state flag 262b is ON (S12: No), the processes of S13 and S14 are skipped.

[0117] On the other hand, in the process of S11, if the current lever position is not ON (S11: No), it is confirmed whether the current lever position is OFF (S15). If the current lever position is OFF (S15: Yes), in order to confirm whether the lever position is operated from ON to OFF, it is confirmed whether the lever state flag 262b is ON (S16).

[0118] When the lever state flag 262b is on (S16: Yes), the lever state flag 262b is set to off (S17). When the lever state flag 262b is set from off (OFF) to on (ON), the mask processing flag 262c is set to off (S14) because the lever operation is completed. On the other hand, in the process of S16, when the lever state flag 262b is off (S16: No), the processes of S17 and S14 are skipped.

[0119] When the current lever position is not ON in the processing of S11 (S11: No) and the current lever position is not OFF in the processing of S15 (S15: No), the current lever position is in a state between ON and OFF, that is, the lever 14 is being operated.

[0120] Therefore, in the process of S15, when the current lever position is not OFF (S15: No), it is confirmed whether the lever state flag 262b is ON or OFF (S18). When the lever state flag 262b is ON (S18: ON), it is a state in which the operation is started from the state in which the lever 14 is ON. In this case, it is confirmed whether the current lever position has reached the first intermediate position (S19). The first intermediate position is, for example, a value indicating that the lever position is 60 when the lever position is 0 and 100 when the lever position is ON.

[0121] In addition, in the process of S18, when the lever state flag 262b is OFF (S18: OFF), the operation is started from the state where the lever 14 is OFF. In this case, it is confirmed whether the current lever position has reached the second intermediate position (S19). The second intermediate position is a position that is smaller than the first intermediate position (for example, 40) when the first intermediate position is set to 60 as described above. That is, the processes of S19 and S20 are used to confirm whether the lever 14 has been operated to the intermediate area of ​​its movable range (the movable area between the first intermediate position and the second intermediate position).

[0122] When the lever 14 is moved to the middle of its movable range, it is necessary to cancel the musical sound generation (start masking processing) to prevent the rim 7 from being struck by mistake due to vibration of the lever 14 when it reaches the open (ON) or closed (OFF) state.

[0123] Therefore, when the rod position reaches the first intermediate position in the process of S19 (S19: Yes) or when the rod position reaches the second intermediate position in the process of S20 (S20: Yes), it is confirmed whether the mask processing flag 262c is OFF (S21).

[0124] When the masking processing flag 262c is OFF (S21: Yes), the masking time counter 262d is set to "800" (i.e., the masking time is set to 80 milliseconds) (S22), and the masking processing flag 262c is set to ON (S23). Thus, the masking processing is started. In the masking processing, as described above, with respect to the vibration estimated to be the vibration generated during the lever operation, the generation of the musical sound (the striking sound of the drum rim 7) based on the vibration is canceled, and when it is estimated that the drumhead 6 is struck (the vibration detected by the drumhead sensor 3 is relatively large), the generation of the musical sound based on the striking is not canceled.

[0125] In the case where the mask processing flag 262c is turned on (ON) in the process of S21 (S21: No), the mask processing has already started, so the processes of S22 and S23 are skipped. In addition, in the case where the rod position has not reached the first intermediate position in the process of S19 (S19: No) or in the case where the rod position has not reached the second intermediate position in the process of S20 (S20: No), the rod 14 has not reached the intermediate area of ​​the movable range. Therefore, in these cases, it is not necessary to start the mask processing, so the processes of S21 to S23 are skipped.

[0126] After the processing of S12, S14, S16, S19, S20, S21, and S23, it is confirmed whether the masking time counter 262d is greater than 1 (S24). If the masking time counter 262d is greater than 1 (S24: Yes), 1 is subtracted from the masking time counter 262d (S25), and the series of processing is terminated. In addition, in the processing of S24, if the masking time counter 262d is not greater than 1 (S24: No), since the masking processing is terminated, the processing of S25 is skipped, and the series of processing is terminated. After the rod position detection processing of S4, the processing of S25 is executed. Fig.10 Musical sound generation processing (S5).

[0127] like Fig.10 As shown, in the musical sound generation process of S5, it is confirmed whether the drum head 6 or the drum edge 7 (see FIG. 1 ) is struck based on the output value output from the drum head sensor 3 (drum edge sensor 4). Figure 1)(S30). When the drumhead sensor 3 (drum rim sensor 4) detects an output value above the prescribed value, that is, when the drumhead 6 or the drum rim 7 is hit (S30: Yes), the hitting intensity and the hitting position are calculated (S31). On the other hand, when the drumhead 6 or the drum rim 7 is not hit (S30: No), a series of processing is terminated.

[0128] After the striking intensity and striking position are calculated in the process of S31, it is checked whether the value of the masking time counter 262d is greater than 1 (S32). When the value of the masking time counter 262d is greater than 1 (S32: Yes), although the masking process is in progress, the striking sound of the rim 7 is generated by the following processes of S33 to S35 (masking process canceling means).

[0129] Specifically, when the value of the masking time counter 262d is 1 or more (S32: Yes), the peak values ​​of the output values ​​of the drumhead sensor 3 and the rim sensor 4 are acquired (S33), and it is checked whether the peak value of the drumhead sensor 3 is less than or equal to the first threshold value (S34).

[0130] When the peak value of the drum head sensor 3 is below the first threshold value (S34: Yes), it is confirmed whether the "peak value of the drum rim sensor 4 / the peak value of the drum head sensor 3" is above the second threshold value (S35). When the peak value of the drum head sensor 3 is relatively small (S34: Yes) and the "peak value of the drum rim sensor 4 / the peak value of the drum head sensor 3" is relatively large (S35: Yes), that is, when the vibration detected by the drum rim sensor 4 is relatively large, it is highly likely that the drum rim 7 is hit.

[0131] Therefore, when "peak value of rim sensor 4 / peak value of head sensor 3" is equal to or greater than the second threshold value (S35: Yes), a musical sound corresponding to the striking of rim 7 is generated (output of a sound generation instruction) (S36), and a series of processing is terminated.

[0132] On the other hand, when the peak value of the drum head sensor 3 exceeds the first threshold value in the process of S34 (S34: No) or when the "peak value of the drum rim sensor 4 / the peak value of the drum head sensor 3" is less than the second threshold value in the process of S35 (S35: No), it is highly likely that the drum rim 7 has not been struck. Therefore, in these cases, the processes of S35 and S36 are skipped, and a series of processes are terminated without generating the striking sound of the drum rim 7 (outputting a sound generation instruction).

[0133] In addition, in the processing of S32, when the value of the masking time counter 262d is 0 (less than 1) (S32: No), since it is not in the masking processing, a musical sound corresponding to the strike on the drumhead 6 or the drum edge 7 is generated (control information of the musical sound corresponding to the position of the rod 14 is generated and output to the sound source 11) (S36), and a series of processing is terminated.

[0134] As described above, in this embodiment, the masking process is used to suppress the generation of the hitting sound of the rim 7 by the vibration caused by the lever operation, and on the other hand, when it is estimated that the rim 7 is hit (the vibration when the rim 7 is hit is detected by the rim sensor 4), the hitting sound of the rim 7 can be generated by the processes of S33 to S35 even during the masking process. Therefore, it is easy to generate the musical sound desired by the performer.

[0135] Although the above description has been given based on the above embodiment, the present invention is not limited to the above embodiment at all, and it can be easily estimated that various improvements and modifications can be made within the scope not departing from the gist of the present invention.

[0136] In the embodiment, as an example of the percussion instrument 1, an electronic percussion instrument (electronic drum) imitating an acoustic drum is illustrated, but it is not necessarily limited to this. For example, in an acoustic drum including a "tension rod" or a timpani or vibraphone including a "pedal", the musical sound (electronic sound) generated when the "strike" is struck can be changed based on the position of the "tension rod" or "pedal". For example, in the case where the "pedal" of the timpani or vibraphone is set as an operating member, the drumhead of the timpani or the soundboard of the vibraphone is equivalent to the "strike". That is, if it is a percussion instrument including an "operating member that is provided and can rotate in order to adjust the musical sound generated when the strike is struck", the technology of the embodiment can be applied.

[0137] In the above embodiment, the following case is described: the position of the rod 14 between the open (ON) state and the closed (OFF) state is detected by the optical sensor 19, and different musical sounds are generated at the initial position (open (ON) state), the terminal position (closed (OFF) state) and the position between these (the position halfway between open (ON) and closed (OFF); hereinafter referred to as the "intermediate area") within the movable range of the rod 14. That is, the following case is described: when the drumhead 6 (the body to be struck) is struck when the rod 14 is in the intermediate area, a musical sound different from the state where the rod 14 is in the initial position and the terminal position is generated, but it is not necessarily limited to this.

[0138] For example, the structure may be such that the middle area within the movable range of the rod 14 is divided into a plurality of areas and different musical sounds are generated in each of these areas. As an example of such a structure, for example, the following structure may be illustrated: the middle area within the movable range of the rod 14 is divided into a first area close to the open (ON) side and a second area close to the closed (OFF) side, and different musical sounds (musical sounds with different effects) are generated when the drumhead 6 is struck when the rod 14 is in the first area and when the drumhead 6 is struck when the rod 14 is in the second area. If such a structure is used, more diverse musical sounds can be generated. In addition, if the middle area within the movable range of the rod 14 is divided into three or more areas (if more than three kinds of musical sounds are generated in the middle area), more diverse musical sounds can be generated.

[0139] In the above embodiment, the situation that the musical sound when hitting the drum head 6 changes according to the position of the rod 14 is described, but it is not necessarily limited to this. For example, it is also possible to have a structure that changes the musical sound when hitting the drum edge 7 according to the position of the rod 14 (giving different effects according to the position of the rod 14). In addition, for example, the position or speed of the rod 14 can also be detected, and other controls can be performed based on the detection results. As an example of other controls, the lighting of the workbench or the switching of images can be exemplified.

[0140] In the embodiment, the optical sensor 19 is illustrated as an example of a sensor (first sensor) for detecting the position of the rod 14, but other well-known sensors (sensors or potentiometers that detect changes in magnetic fields or electrostatic capacitance, etc.) may also be used to detect the position of the rod 14.

[0141] In the above embodiment, the structure in which the reflecting surface 144a is rotated (displaced) in a direction substantially orthogonal to the optical axis direction of the optical sensor 19 (light projecting element 190) is described, but for example, the reflecting surface of the rod 14 may be displaced in the optical axis direction of the optical sensor 19. That is, if the structure is such that the position of the rod 14 can be detected, the position of the optical sensor 19 can be appropriately set.

[0142] In addition, "the reflecting surface 144a is displaced in a direction substantially orthogonal to the optical axis of the optical sensor 19" means that the rod 14 is rotated so that when the light from the optical sensor 19 is irradiated onto the reflecting surface 144a (the reflecting surface 144a is located on the optical axis of the optical sensor 19), the angle of the reflecting surface 144a relative to the optical axis of the optical sensor 19 is always less than 20° (more preferably less than 10°).

[0143] In addition, “the rotation axis 16 of the rod 14 (the rotation center of the rod 14) is approximately orthogonal to the optical axis of the light sensor 19” preferably means that the rotation center of the rod 14 is located on the optical axis of the light sensor 19. However, if the rod 14 is rotated into a structure in which the angle of the reflecting surface 144a relative to the optical axis of the light sensor 19 is always less than 20° (more preferably less than 10°) as described above, the rotation center of the rod 14 may not necessarily be located on the optical axis of the light sensor 19.

[0144] In the above embodiment, the following case is described: the reflective material 24 attached to the reflective surface 144a of the rod 14 includes a resin layer formed using a film made of resin (for example, PET) and a metal layer made of metal (for example, aluminum) laminated on the resin layer, but it is not necessarily limited to this. For example, if the light reflected by the reflective surface 144a can be adjusted, other well-known films can be used as the reflective material 24, and the reflective material 24 can also be omitted.

[0145] In the above embodiment, the position of the rod 14 is detected by flashing the optical sensor 19 using the detection circuit 27 (control circuit 270) and subtracting the output value when it is off held in the holding circuit 272 from the output value when it is on. However, the detection process of the position of the rod 14 may be performed on the CPU 260 instead of the detection circuit 27. In addition, a configuration may be adopted in which the optical sensor 19 is continuously lit and such subtraction is not performed.

[0146] In the above embodiment, the case where the light projecting element 190 is lit for a shorter time than the off time of the light projecting element 190 is described, but the present invention is not necessarily limited to this. For example, the off time and the lighting time of the light projecting element 190 may be the same length, or the light projecting element 190 may be lit for a longer time than the off time of the light projecting element 190.

[0147] In the above-described embodiment, the following case is described: when the lever 14 is operated, the masking process is performed, and when it is estimated that the rim 7 is hit (the vibration when the rim 7 is hit is detected by the rim sensor 4), the hitting sound of the rim 7 is generated even in the masking process, but it is not necessarily limited to this. For example, in the masking process, the generation of musical sounds based on the detection results of the drumhead sensor 3 or the rim sensor 4 may be completely canceled, or a structure in which the masking process is not performed may be adopted.

[0148] In the above embodiment, the structure in which the percussion instrument 1 outputs a sound generation instruction to the external sound source 11 is described, but the percussion instrument 1 may also include the sound source 11. In any structure, various musical sounds can be generated by generating information for controlling musical sounds according to the position of the rod 14 detected by the optical sensor 19, and generating a musical sound signal based on the information using the sound source 11.

Claims

1. A percussion instrument, characterized in that: include: The struck body is struck by the performer; An operating member is provided to adjust the musical sound produced when the struck body is struck and is rotatable; and a first sensor for detecting the position of the operating member between an initial position and a terminal position of the rotational motion of the operating member, The percussion instrument is capable of generating information for controlling musical sounds according to the position of the operating member detected by the first sensor.

2. The percussion instrument according to claim 1, characterized in that: The speed of the operating element can be calculated based on the position of the operating element detected by the first sensor, and information for controlling musical sound according to the speed can be generated.

3. The percussion instrument according to claim 1, characterized in that: The first sensor is a light sensor including a light projecting element for irradiating light toward a reflecting surface of the operating member and a light receiving element for receiving light reflected from the reflecting surface.

4. The percussion instrument according to claim 3, characterized in that: In a state where the light from the light projecting element is irradiated onto the reflecting surface, the reflecting surface is displaced in a direction orthogonal to the optical axis of the light projecting element.

5. The percussion instrument according to claim 3, characterized in that: The rotation axis of the operating member is orthogonal to the optical axis of the light projecting element.

6. The percussion instrument according to claim 3, characterized in that: comprising a light shielding component, the light shielding component being arranged between the optical sensor and the rotating shaft when viewed in the axial direction of the rotating shaft of the operating member, In a state where the light from the light projecting element is irradiated onto the reflecting surface, the reflecting surface is located between the light receiving element and the light shielding component.

7. The percussion instrument according to claim 3, characterized in that: The operating member includes a reflective material, which is installed on the reflective surface and is used to adjust the amount of light reflected by the reflective surface.

8. The percussion instrument according to claim 3, characterized in that: include: Lighting up the control unit to make the light-projecting element flash; a storage unit for storing, as a turn-off output value, an output value of the light receiving element when the lighting control unit turns off the light projecting element; The position of the operating element is detected based on a value obtained by subtracting the output value at the time of light extinguishing stored in the storage unit from the output value of the light receiving element when the lighting control unit lights up the light projecting element.

9. The percussion instrument according to claim 8, characterized in that: The lighting control unit lights up the light projecting element for a time shorter than a light-off time of the light projecting element.

10. The percussion instrument according to claim 1, characterized in that: include: a frame for mounting the struck body and the operating member; and a second sensor for detecting the vibration of the frame, The percussion instrument is capable of generating information for controlling musical sounds based on the detection result of the second sensor. On the other hand, when it is presumed that the second sensor detects vibration of the frame caused by operation of the operating member, information for controlling musical sounds based on the detection result is not generated.

11. The percussion instrument according to claim 10, characterized in that: When it is estimated that the vibration of the housing due to hitting is detected by the second sensor, information on a control musical sound based on the detection result is generated.

12. A method for generating musical sounds, which is a method for generating musical sounds in a percussion instrument, the percussion instrument comprising: The struck body is struck by the performer; An operating member is provided to adjust the musical sound produced when the struck body is struck and is rotatable; and a first sensor for detecting the position of the operating member between an initial position and a terminal position of the rotational motion of the operating member, and the method for generating musical sound is characterized in that: A musical sound is generated based on the position of the operating element detected by the first sensor.

Images