JP5076926B2 - Drumsticks and electronic drums - Google Patents

Description

  The present invention relates to a drum stick and an electronic drum.

In the drum performance, an important element for performing a comfortable performance is a response transmitted to the performer through the drum stick. When the acoustic drum is struck with a drumstick, the tip of the drumstick receives a repulsive force from the drum surface after colliding with the leather drum surface, and this repulsive force is applied to the player's hand through the drumstick. It is transmitted. This repulsive force creates a comfortable response when playing acoustic drums. Moreover, since this repulsive force is generated, repeated hitting is facilitated.
US Pat. No. 5,503,056 Japanese Patent Laid-Open No. 2004-70071 JP 2005-37922 A JP-A-2005-234400

  There are cases where a drum pad for practicing drum performance is hit with a drum stick or an electronic drum is hit with a drum stick. In many of these, the hit part is made of rubber, and when struck by a drum stick, it does not give a repulsive force to the drum stick as in the case of an acoustic drum. For this reason, the performance of hitting this kind of drum pad or electronic drum with a drumstick does not provide the response that is obtained when playing an acoustic drum, lacks the comfort of performance, and is difficult to play repeatedly. There was a problem.

  The present invention has been made in view of the circumstances described above, and technical means for making the user feel a response like when playing an acoustic drum even when the drum other than the acoustic drum is hit with a drum stick. The purpose is to provide.

The present invention provides a striking strength measuring means for measuring a striking strength when the striking portion of the drum stick strikes the striking portion, and a pressure applied to the striking portion when the striking portion strikes the striking portion. A drum stick comprising: a repulsive force control means for controlling the repulsive force according to the striking strength measured by the striking strength measuring means.
Further, the present invention provides a striking strength measuring means for measuring a striking strength when the striking portion of the electronic drum is hit by the striking portion, and a repelling force of the striking portion with respect to the striking portion as the striking strength measuring means. There is provided an electronic drum comprising a repulsive force control means for controlling in accordance with the striking strength measured by the above.
According to this invention, when the hitting part hits the hit part, a repulsive force corresponding to the hitting strength is applied from the hit part to the hit part. Therefore, the user can perform a performance while feeling a comfortable repulsive force through the hitting portion.

  Note that there are Patent Documents 1 and 2 as documents relating to the drumstick. Here, the drum stick disclosed in Patent Document 1 has a configuration in which a coil spring is interposed between the striking portion and the grip portion. Further, Patent Document 2 has a configuration in which a coil spring is interposed in the middle part of the gripping part that fits in the palm. However, the technique disclosed in Patent Document 1 is intended to provide a drum stick in which the hitting part and the gripping part are elastically coupled, and the technique disclosed in Patent Document 2 is a hit part by a drum stick. The purpose is to alleviate the impact transmitted to the performer's palm when hitting. The disclosure or suggestion regarding the technical idea of measuring the striking strength when the striking portion of the drumstick strikes the striking portion and applying the repulsive force according to the striking strength from the striking portion to the striking portion is disclosed in Patent Document 1 and Not in 2.

  Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment>
FIGS. 1A and 1B are diagrams showing the configuration of a drum stick according to the first embodiment of the present invention. The drum stick according to the present embodiment is divided into a tip portion 10 having an egg-shaped chip 11 as a hitting portion and a rod portion 20 as a portion closer to the gripping portion. The distal end portion 10 is attached to the rod portion 20 so as to be rotatable around a shaft 21 fixed to the rod portion 20. FIG. 1A shows a state in which the distal end portion 10 is not rotated and extends straight in the same direction as the rod portion 20, and FIG. The state rotated about 21 is shown. In this embodiment, the user holds the drum stick so that the shaft 21 is on the lower side. An acceleration sensor 22, an actuator 23, and a repulsive force control unit 24 are provided inside the bar unit 20. The acceleration sensor 22 is located near the tip 10 in the bar 20. The acceleration sensor 22 is a uniaxial acceleration sensor, detects acceleration in the vertical direction in a state where the shaft 21 is positioned on the lower side, and outputs an acceleration detection signal indicating the magnitude of the acceleration. A rod 23R protrudes from the actuator 23, and the tip of this rod 23R is connected to the tip 10 of the drumstick. The actuator 23 is a device that drives the rod 23 </ b> R in translation and rotates the tip 10 around the shaft 21 under the control of the repulsive force control unit 24. Based on the acceleration detection signal output from the acceleration sensor 22, the repulsive force control unit 24 obtains the striking strength when the chip 11 that is the striking unit strikes the striking portion such as a plate or rubber, and uses this striking strength. In response, the pressure applied to the tip 10 by the actuator 23 via the rod 23R is controlled.

  The operation of this embodiment is as follows. First, the repulsive force control unit 24 regards that the drum stick is swung down during a period in which the positive acceleration detection signal indicating the acceleration in the direction from the top to the bottom is output from the acceleration sensor 22, and detects the acceleration during this period. Monitor the signal. When the polarity of the acceleration detection signal changes from positive to negative, the repulsive force control unit 24 considers that the tip 11 that is the hitting portion of the drumstick has collided with the hitting portion, and the hitting strength of the hitting portion by the tip 11 Ask for. There are various methods for calculating the impact strength. For example, the acceleration detection signal is integrated to obtain the speed of the drumstick, and the motion of the chip 11 is calculated from the square value of the speed at the time of the collision of the chip 11 with the hit portion. Energy or momentum may be obtained and used as the hitting strength.

  Next, the repulsive force control unit 24 controls the pressure generated by the actuator 23 so that a pressure corresponding to the calculated hitting strength is applied to the distal end portion 10 via the rod 23R. Various modes are also conceivable for this pressure control, but for example, the following may be used. First, the waveform of the pressure applied to the tip portion 10 is stored in advance in a ROM, for example. When a collision of the chip 11 with the hit portion is detected, the pressure waveform is read from the ROM, multiplied by a gain corresponding to the hit strength, and the pressure indicated by the pressure waveform after the gain multiplication is generated in the actuator 23. .

  When pressure is applied to the tip 10 from the actuator 23 in this way, the tip 10 of the drumstick rotates about the shaft 21 as illustrated in FIG. 1B, and the tip 11 of the tip 10 is moved. It is pressed against the hit part by the pressure from the actuator 23. At that time, a repulsive force that opposes the pressure that presses the tip 11 against the hit portion is given to the tip 11 from the hit portion, and this repulsive force is transmitted to the user's hand via the drumstick. Therefore, the user can feel the same response as when playing the acoustic drum, even when the drum stick is used to hit a non-acoustic drum such as a wooden or rubber plate.

Second Embodiment
FIG. 2 is a diagram showing a configuration of a drum stick according to a second embodiment of the present invention. In the first embodiment, the tip 10 can be bent only in one direction. The drum stick according to the present embodiment has a configuration capable of bending the distal end portion 10 in a free direction.

  In FIG. 2, for easy understanding, a cross-sectional structure of a portion of the rod portion 20 to which the tip portion 10 is attached is shown. As shown in the figure, a connecting sphere 12 is fixed to the end surface of the tip portion 10 via a rod-shaped portion, and this sphere 12 is accommodated in a spherical cavity provided on the end surface of the rod portion 20. Yes. Therefore, the distal end portion 10 can freely turn around the spherical body 12 housed in the cavity of the rod portion 20.

  In the rod portion 20, an acceleration sensor 22A, an actuator 23A, and a repulsive force control portion 24A are accommodated. The acceleration sensor 22A in the present embodiment is a triaxial acceleration sensor, and detects acceleration components acting on the acceleration sensor 22A in three axial directions that are orthogonal to each other, and an acceleration detection signal that indicates the magnitude of each acceleration component. Is output. A plurality of rods 23R arranged so as to form a circle protrude from the actuator 23A, and each rod 23R abuts each tip on the end surface of the tip portion 10. The actuator 23A is a device that drives the plurality of rods 23R in translation under the control of the repulsive force control unit 24A, and drives the tip 10 to turn around the sphere 12 as a fulcrum. Based on the acceleration detection signal output from the acceleration sensor 22A, the repulsive force control unit 24A obtains the striking strength when the chip 11 serving as the striking portion strikes the hitting portion such as a plate or rubber, and the striking strength is obtained. Accordingly, each pressure applied to the tip portion 10 by the actuator 23A via each of the plurality of rods 23R is controlled.

  The operation of this embodiment is as follows. First, the repulsive force control unit 24 monitors triaxial acceleration components indicated by the acceleration detection signal output by the acceleration sensor 22A. When a sudden change in the acceleration component in the three-axis direction (for example, the reversal of the polarity of one or two components) is detected, the repulsive force control unit 24A causes the tip 11 which is a drum stick striking part to collide with the hit part. In the same manner as in the first embodiment, the hitting strength of the hit portion by the tip 11 is obtained.

  Next, the repulsive force control unit 24A obtains the direction of the acceleration vector immediately before hitting based on the acceleration detection signal output from the acceleration sensor 22A immediately before hitting, and is a pressure that bends the tip 10 in the direction of the acceleration vector, The driving force generated by the actuator 23A is controlled so that a pressure corresponding to the striking strength is applied to the distal end portion 10 via the plurality of rods 23R. More specifically, the repulsive force control unit 24A obtains the rod 23R located on the start point side (upstream side) and the rod 23R located on the end point side (downstream side) of the acceleration vector immediately before hitting among the plurality of rods 23R. . Then, the repulsive force control unit 24A projects the tip of the rod 23R located on the start point side of the acceleration vector, retreats the tip of the rod 23R located on the end point side, and moves the other rods R from the start point side to the end point side. The drive distance ratio when the actuator 23A drives each rod R in a translational manner is determined so that the protruding length becomes shorter as it goes to. And the pressure which actuator 23A gives to the front-end | tip part 10 via the several rod 23R is controlled so that the pressure of the magnitude | size according to striking intensity | strength is added to the front-end | tip part 10. FIG.

  In this embodiment as well, as in the first embodiment, the user feels the same response as when playing an acoustic drum even when the user does not hit an acoustic drum such as a wooden or rubber plate with a drumstick. Can do. Further, in the drum stick according to the present embodiment, the direction of the acceleration vector of the drum stick immediately before hitting is automatically detected, and a pressure for bending the tip portion 10 in this direction is generated by the actuator 23A. Therefore, regardless of the direction of the drum stick when holding the drum stick in the hand, the user can apply a pressure in the same direction as the striking direction to the tip portion 10 at the time of striking, and the user can feel an appropriate response. .

<Third Embodiment>
FIG. 3 is a diagram showing the configuration of a drum stick according to a third embodiment of the present invention. In this drum stick, the tip 11B, which is a striking portion, is an egg-shaped elastic body having an air reservoir 13B inside, and can be inflated like a rubber balloon by increasing the amount of air stored in the air reservoir. It is. An acceleration sensor 22B, an actuator 23B, and a repulsive force control unit 24B are provided inside the rod unit 20B excluding the chip 11B in the drumstick. Further, a conduit 25B for introducing air into the air reservoir 13B and a cylinder 26B having a pipe diameter larger than the conduit 25B and communicating with the conduit 25B are formed inside the rod portion 20B. A piston 27B protruding from the actuator 23B is inserted into the cylinder 26B. The actuator 23B is a device that moves the piston 27B forward and backward under the control of the repulsive force control unit 24B, increases or decreases the amount of air stored in the air reservoir 13B, and expands or contracts the tip 11B. The acceleration sensor 22B is a triaxial acceleration sensor similar to that of the second embodiment. The repulsive force control unit 24B detects a hit of the hit part by the chip 11B and detects a hitting strength by detecting a sudden change in an acceleration detection signal output from the acceleration sensor 22B. Then, the repulsive force control unit 24B controls the driving amount of the piston 27B by the actuator 23B so that the tip 11B is appropriately expanded and a pressure corresponding to the hitting strength is applied from the tip 11B to the hit part.
Also in this embodiment, the same effect as the second embodiment can be obtained.

<Fourth embodiment>
4 (a) and 4 (b) are views showing a configuration of a drum stick according to a fourth embodiment of the present invention. As in the first and second embodiments, the drumstick is divided into a tip portion 10 having a tip 11 and a rod portion 20. In the present embodiment, the tip portion 10 and the rod portion 20 are connected by an elastic rod 31. In addition, an air reservoir 32 is inserted between the end face of the tip portion 10 and the end face of the rod portion 20 so as to surround the elastic rod 31. Inside the rod portion 20, the acceleration sensor 22B, the actuator 23B having the piston 27B, the repulsive force control portion 24B, the conduit 25B and the cylinder 26B in the third embodiment are provided. However, in the present embodiment, a conduit corresponding to the conduit 25 </ b> B guides air to the air reservoir 32.

In a normal state, an appropriate amount of air is stored in the air reservoir 32, and there is a margin to store air even though it is small. In this state, when the user swings down the drumstick and strikes the tip 11 against the hit portion 40, the elastic rod 31 is bent and the tip portion 10 is moved with respect to the rod portion 20 as shown in FIG. Turn. When the hit portion 40 is hit by the tip 11, the drum stick is controlled in the same manner as in the third embodiment, and air is sent to the air reservoir 32 so that the air reservoir 32 is inflated with air pressure corresponding to the impact strength. It is. As a result, as illustrated in FIG. 4B, the air reservoir 32 swells, and the pressure from the air reservoir 32 aligns the distal end portion 10 with the rod portion 20. As a result, the tip portion 10 is pressed against the hit portion 40. In that case, the repulsive force from the hit | damaged part 40 is transmitted to a user's hand via a drumstick, and the user feels the response of a performance.
Also in this embodiment, the same effect as the third embodiment can be obtained.

<Fifth Embodiment>
FIG. 5 is a diagram showing the configuration of an electronic drum according to the fifth embodiment of the present invention. The electronic drum according to the present embodiment is improved from the normal electronic drum so that the user who hits the drum pad 50 as the hit part with the drum stick is given the same response as when the acoustic drum is hit. It is a thing.

  The improvements of the electronic drum according to this embodiment are as follows. First, the drum pad 50, which is the hit portion, is supported so as to move up and down. An actuator 61 that moves the drum pad 50 up and down is provided, and a repulsive force control unit 62 that controls the actuator 61 based on an output signal of the piezoelectric sensor 51 fixed to the drum pad 50 is provided. Here, like a normal electronic drum, the piezoelectric sensor 51 is a sensor that detects the vibration of the drum pad 50, and its output signal is sent to a sound source to trigger a musical sound signal. Based on the output signal waveform of the piezoelectric sensor 51, the repulsive force control unit 62 obtains the striking strength when the drum stick 70 strikes the drum pad 50, and the pressure corresponding to the striking strength is applied from the drum pad 50 to the drum stick. The lift amount of the drum pad 50 by the actuator 61 is controlled so as to be returned to 70.

  According to the present embodiment, when the user strikes the drum pad 50 with the drum stick 70, a repulsive force corresponding to the striking strength is returned from the drum pad 50 to the drum stick 70. Therefore, the user can feel the same response as when the acoustic drum is struck.

<Sixth Embodiment>
FIG. 6 is a block diagram showing a functional configuration of an electronic drum according to the sixth embodiment of the present invention.
The acoustic drum has a configuration in which a drum head made of a plastic film such as leather or polyester film is stretched around an annular frame (rim). For this reason, the repulsive force returned from the drum head when the drum head is hit with the drum stick varies depending on the position of the hit point on the drum head. In the present embodiment, the dependency of the repulsive force on the hitting point position at the time of hitting can be reproduced even on an electronic drum.

  In FIG. 6, a striking strength detection sensor 63 is a sensor for detecting the striking strength when the drum stick strikes the drum pad 50. As in the fifth embodiment, the impact strength detection sensor 63 may use the piezoelectric sensor 51 for obtaining a signal that triggers the generation of a musical sound signal, or may use another sensor such as an acceleration sensor. Also good. A sensor that outputs a signal that accurately reflects the kinetic energy received by the drum pad 50 from the drum stick is preferably used as the impact strength detection sensor 63.

  The hit point position detection unit 64 is a device that detects a position where the drum stick strikes the drum pad 50. In the case of an acoustic drum, the magnitude of the repulsive force at the time of hitting depends on the distance from the center of the drum head to the hit point position. Therefore, the hit point position detection unit 64 only needs to output a signal indicating the distance from the center of the drum pad 50 to the hit point position.

  Various configurations of the hit point position detection unit 64 may be considered. For example, as disclosed in Patent Document 3, a plurality of vibration detection sensors provided at positions equidistant from the center on the drum pad 50; and The hit point position detection unit 64 may be configured by a device that calculates the hit point position based on the time difference between the start times of the vibration waveforms detected by each of the plurality of vibration detection sensors.

  Alternatively, as disclosed in Patent Document 4, a structure in which a conductive member and a base member having a plurality of annular conductive regions concentrically concentrically disposed with spacers disposed therebetween is disposed immediately below the drum pad 50. May be adopted. According to this configuration, when the drum pad 50 is struck, one annular conductive region and the conductive film come into contact with each other at the hit point position to conduct electricity. Therefore, one conductive region connected to the conductive film is detected from a plurality of annular conductive regions, and it is determined that there is a dot in the conductive region. Even in this configuration, it is possible to detect the hit point position in real time.

  The repulsive force control unit 62 </ b> A detects the impact of the drum pad 50 by the drumstick and detects the impact strength based on the output signal of the impact strength detection sensor 63, and the repulsive force corresponding to the impact strength is generated from the drum pad 50 to the drum. The actuator 61 is controlled so as to be given to the stick. At that time, the repulsive force control unit 62A in the present embodiment changes the dependence of the repulsive force on the striking strength (that is, the pressure applied to the drum pad 50) by the striking point position detected by the striking point position detection unit 64. . Here, the repulsive force may be obtained, for example, by a calculation process using a function in which the impact strength and the distance from the center of the drum pad 50 at the hit point position are independent variables, and the repulsive force is a dependent variable. A table in which a set of distances from the center of the drum pad 50 at the hitting point position is associated with the repulsive force in advance may be stored and obtained by referring to this table. Alternatively, a repulsive force waveform at the time of hitting is stored in advance in association with various hitting point positions, and at the time of hitting detection, a repulsive force waveform corresponding to the hitting point position is read out, and a gain corresponding to the hitting strength is read. And the actuator 61 may be controlled so that the repulsive force after the gain multiplication is generated from the drum pad 50.

  As described above, according to the present embodiment, the repulsive force that varies depending on the striking point position can be applied from the drum pad 50 to the drum stick, similarly to the performance of the acoustic drum.

  Although one embodiment of the present invention has been described above, various other embodiments are conceivable for the present invention. For example:

(1) In the performance of an acoustic drum, the relationship between the impact strength when the drum head is struck and the magnitude of the repulsive force received by the drum stick is not necessarily proportional, and the material and tension of the drum head, the material of the drum stick, etc. It is thought that it depends on. Therefore, the first to sixth embodiments may be modified as follows. First, a function or table showing a plurality of types of characteristics A to D showing the relationship between the impact strength and the repulsive force as illustrated in FIG. 7 is created, and the material of the drum stick, the material of the drum head, the tension of the drum head, etc. A table for associating a set of various parameters indicating any of the characteristics A to D with a drum stick (when the first to fourth embodiments are modified) or an electronic drum (the fifth or sixth embodiment) Is stored in the repulsive force control unit. The drum stick or the electronic drum is provided with an operation element for designating the material and tension of the drum head, the material of the drum stick, and the like. The repulsive force control unit corresponds to the striking strength according to a function or table indicating characteristics corresponding to a set of drum stick material, drum head material, drum head tension and the like specified by the operation of the operator. The calculated repulsive force is calculated. According to this aspect, when hitting something other than the acoustic drum with the drum stick or hitting the electronic drum, it is possible to obtain a response similar to the response obtained during performance using the desired acoustic drum and the desired drum stick. it can.

(2) The drum stick according to the first to fourth embodiments has a function of driving the striking portion. Therefore, an automatic performance function using this function may be provided in the drum stick. FIG. 8 is a block diagram showing a functional configuration of a drum stick in which an automatic performance function is added to the drum stick according to the first embodiment. In the drum stick, a wireless communication unit 28 that receives a note-on message from an external device via a wireless section is added to the first embodiment. When an instruction for automatic performance is given by operating an operator (not shown), the repulsive force control unit 24 causes the actuator 23 to drive the tip 10 every time the wireless communication unit 28 receives a note-on message. FIG. 9 illustrates an automatic drum performance performed in this way. When the drum stick performs an automatic performance, the tip 11 is placed on the drum head 80 and the gripping portion of the drum stick is supported by an appropriate fulcrum 81 as shown in the figure. The user may play the role of such a fulcrum by holding the grip portion lightly. In this state, when the wireless communication unit 28 receives a note-on message (see FIG. 9A), the repulsive force control unit 24 causes the actuator 23 to drive the tip 10, so that the tip 11 of the drumstick is moved to the drum head 80. (See FIG. 9B). Thereafter, the chip 11 falls and strikes the drum head 80, and a drum sound is produced (see FIG. 9C). Such an operation is performed every time the wireless communication unit 28 receives a note-on message, and automatic drum performance is realized.

(3) In each of the above embodiments, an acceleration sensor or a piezoelectric sensor is used as a sensor for measuring the impact strength. However, this is only an example, and pressure for measuring the pressure acting between the impacted portion and the impacted portion. Various sensors such as sensors can be used as sensors for measuring the impact strength.

(4) In the embodiment of the electronic drum, the drum pad is divided into a plurality of areas, and a sensor for measuring the impact strength for each area and an actuator for driving the area to generate a repulsive force are provided. You may make it generate | occur | produce the repulsive force according to impact strength in a different aspect.

(5) In the embodiment of the drumstick, the output signal waveform of a sensor for measuring the impact strength (acceleration sensor in the first to fourth embodiments) is taken out by communication means such as wireless communication means, and this output signal You may comprise so that the musical sound with the tone color and magnitude | size according to a waveform may be generated from a sound source. Here, when the hit part is a rubber drum pad or the like, no loud sound is generated even if it is hit with a drum stick. Therefore, a drum performance can be performed by generating a musical sound from the sound source according to the hitting of the hit portion by the drum stick while feeling the same response as the acoustic drum by hitting the hit portion with the drum stick.

(6) Strictly speaking, the repulsive force that the drum stick receives from the striking surface depends on the angle between the striking direction of the drum stick and the striking surface even if the kinetic energy or momentum of the drum stick at the time of striking is the same. It will be different. Therefore, in the embodiment of the drumstick, the angle between the striking direction and the striking surface when the drumstick strikes the striking surface such as a drum pad is obtained, and based on both the kinetic energy and the striking angle of the drumstick, You may make it determine the repulsive force given to a drumstick. For example, when the striking angle is 90 °, the ratio of the repulsive force to the kinetic energy of the drumstick is maximized, and the ratio of the repulsive force to the kinetic energy of the drumstick is reduced according to the amount of deviation from the striking angle of 90 °. Let

(7) The relationship between the striking strength and the repulsive force received by the drumstick from the striking surface varies depending on the striking object such as a drum or cymbal. Further, the moving direction of the drum stick until the drum stick reaches the hit surface depends on the position of the hit object such as a drum or a cymbal as viewed from the performer. Therefore, a sensor that detects the angle of the striking direction with respect to the horizontal direction as a striking angle is provided on the drumstick, and the assumed hitting object is switched according to the striking angle detected by this sensor, and it corresponds to the assumed hitting object. You may make it give a repulsive force to a drumstick. For example, when the hitting angle is 45% or less, it is considered that the player is hitting the acoustic drum as an hit object, and a repulsive force corresponding to the acoustic drum is given to the drumstick. Further, for example, when the hitting angle is 45% or more, it is considered that the player is hitting the cymbals as an hit object, and a repulsive force corresponding to the cymbals is given to the drumstick. According to this aspect, when the player changes the hitting angle and makes a hit with the drumstick, the player can be given a response corresponding to various hit objects determined by the hitting angle.

It is a figure which shows the structure of the drumstick which is 1st Embodiment of this invention. It is a figure which shows the structure of the drumstick which is 2nd Embodiment of this invention. It is a figure which shows the structure of the drumstick which is 3rd Embodiment of this invention. It is a figure which shows the structure of the drumstick which is 4th Embodiment of this invention. It is a figure which shows the structure of the electronic drum which is 5th Embodiment of this invention. It is a figure which shows the structure of the electronic drum which is 6th Embodiment of this invention. It is a figure which illustrates the relationship between the striking strength of the hit | damage part by the hit | damage part implement | achieved in other embodiment of this invention, and the repulsive force which a hit | damage part receives. It is a figure which shows the structure of the drumstick which is other embodiment of this invention. It is a figure which shows the mode of the automatic drum performance performed with the drumstick.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Tip part, 11, 11B ... Tip part, 12 ... Spherical part, 13 ... Air reservoir, 20 ... Rod part, 21 ... Shaft, 22, 22A, 22B ... Acceleration sensor, 23, 23A , 23B, 61 ... Actuator, 23R ... Rod, 24, 24A, 62, 62A ... Repulsive force control unit, 25B ... Conduit, 26B ... Cylinder, 27B ... Piston, 31 ... Elastic rod, 32 ... ... Air reservoir, 40... Impacted part, 50... Drum pad, 51... Piezoelectric sensor, 63 .. impact strength detection sensor, 64.

Claims (5)

A striking strength measuring means for measuring a striking strength when the striking portion of the drumstick strikes the striking portion;
Repulsive force control means for controlling the pressure applied to the hit portion when the hit portion hits the hit portion according to the hit strength measured by the hit strength measuring means. Drum stick. Comprising means for accepting designation of parameters relating to the hitting portion and the hitting portion;
The repulsive force control means controls processing for determining a pressure to be applied to the hit portion based on a hit strength measured by the hit strength measuring means according to a designated parameter. Drum sticks as described in   2. The apparatus according to claim 1, further comprising means for receiving performance data, wherein the repulsive force control means controls the pressure applied to the hit part by the hitting unit in accordance with the received performance data to perform an automatic drum performance. The drumstick according to 1 or 2. A striking strength measuring means for measuring a striking strength when the striking portion of the electronic drum is hit by the striking portion;
An electronic drum comprising: a repulsive force control means for controlling a repulsive force of the hit part against the striking part according to a striking strength measured by the striking strength measuring means. Comprising means for accepting designation of parameters relating to the hitting portion and the hitting portion;
The said repulsive force control means controls the process which determines the repulsive force with respect to the said striking part based on the striking strength measured by the said striking strength measuring means according to the designated parameter. The electronic drum described.

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