JP5245101B2 - Electronic drum - Google Patents

Description

  The present invention relates to an improvement of an electronic drum that can emit a striking sound in which a required control is performed based on a signal from a pressure sensor that is pressed by pressing a striking surface that is an upper surface of a drum head portion.

  2. Description of the Related Art Conventionally, electronic drums that can control the pitch (pitch), volume, and the like of emitted hitting sounds by pressing the hitting surface of the electronic drum with a hand have been proposed. For example, a soundboard is supported on a support portion provided on the inner peripheral side of the trunk body (shell), and a shock absorber is provided on the soundboard, and a pressure sensor is provided between the soundboard and the shock absorber. An electronic drum having an intervening structure has been proposed (see, for example, Patent Document 1). In this electronic drum, the pitch control of the hitting sound is performed by performing signal processing based on the signal from the pressure sensor pressed by pressing the hitting surface with a hand or the like.

JP 7-295561 A

  Certainly, according to this electronic drum, although the pitch control or the like can be performed by pressing the striking surface with a hand or the like, there is an insensitive region where the pressure sensor does not detect this even when the striking surface is pressed. A pressure sensor having a surface area equivalent to the area of the striking surface (see the shaded area in FIG. 6A) had to be used. For this reason, there has been a problem that the cost of the pressure sensor is increased and it is difficult to reduce the size of the electronic drum itself. In order to solve this problem, the protrusion provided on the back surface of the drum head portion is configured to be able to descend inside the cylinder by a pressing operation on the striking surface, and a pressure sensor is provided on the bottom of the cylinder to press the striking surface. In this case, an apparatus in which the protrusion presses the pressure sensor to reduce the surface area of the pressure sensor is also conceivable. However, the number of parts increases and the processing accuracy of the inner periphery of the cylinder is required. Therefore, the cost was high.

  The present invention has been made to solve such a conventional problem, and by simply pressing the striking surface with a hand or the like even with a small pressure sensor, the pitch control of the striking sound to be emitted can be simplified. An object of the present invention is to provide an electronic drum that can be configured.

In order to achieve the above object, the present invention is capable of emitting a striking sound in which a required control is performed based on a signal from a pressure sensor that is pressed by pressing a striking surface that is the upper surface of the drum head. In the electronic drum
An elastic body in close contact with the surface opposite to the striking surface of the drum head part;
A headboard on which the elastic body is placed;
A bottom case provided with the pressure sensor so as to face the headboard,
Three or more support portions formed by L-shaped notches that are L-shaped or L-shaped in a plan view are provided on the outer periphery of the headboard, and each of the plurality of support portions is provided. The bottom case is fastened by fastening means.

  According to this structure, the support part formed in the outer peripheral part of the headboard which mounts the elastic body closely_contact | adhered to the surface opposite to the striking surface of a drum head part by the notch part of planar view L-shape or reverse L-shape. A plurality of three or more are provided, and each of the plurality of support portions is fastened by a fastening means to a bottom case provided with a pressure sensor so as to face the headboard. As a result, the support portion fastened by the fastening means by the pressing against the striking surface descends downward in a bent state, while the entire headboard descends integrally in a flat state, so that it has the same area as the striking surface. It is not necessary to provide a pressure sensor having a large surface area. Thus, it is possible to provide an electronic drum that can easily perform various controls such as pitch control by pressing the striking surface with a hand or the like even when a small pressure sensor is used.

Further, in the electronic drum, a hole is provided on each tip end side of the plurality of support portions, and a support column in which a hole corresponding to each hole is formed is provided in the bottom case, and the support is made using screws. If the hole on the tip side of the part and the hole of the support on the bottom case side are fastened, an electronic drum can be realized with a simple structure using screws as the fastening means. Specifically, the cutout portion is a portion (X portion) from the outer peripheral edge of the headboard to a substantially central portion (or the central portion) of the headboard, and substantially perpendicular (perpendicular to this X portion). ) If the support part is constituted by this notch part as a structure having a part (Y part) heading in a specific direction and a circular part (R part) formed at the tip of this Y part, the book can be formed with a simple structure. It is possible to realize a support portion that solves the problems of the invention. The R portion 18 does not have to be a perfect circular shape in plan view, and may be a fan shape that is a part of a circle, and the cutout shape of the joint portion between the X portion and the Y portion is not a perfect right angle. In order to prevent the occurrence of “burrs”, it is preferable to form a curved line. And a vibration pickup for detecting a vibration of the striking surface and outputting a corresponding shock wave signal. The shock wave signal having a predetermined relationship with a preset resonance frequency by inputting the shock wave signal detected by the vibration pickup. A resonance signal processing means for outputting a signal, a PCM signal processing means for receiving a shock wave signal, reading out a recorded signal from a memory in which an actual percussion instrument sound is recorded by the PCM method, and reproducing and outputting the signal, and the resonance signal processing means And a mixing means for mixing the output signal from the PCM system signal processing means with the output signal from the PCM system signal processing means, and a signal configured to supply a signal from the pressure sensor to a required portion of the resonance system signal processing means If the processing circuit is built in the bottom case, the electronic drum can be further reduced in size and the signal processing can be performed. It is possible sounded a striking sound with reality I.

  According to the present invention, there is provided an electronic drum capable of performing, with a simple configuration, pitch control of a striking sound to be emitted by pressing the striking surface with a hand or the like even using a small pressure sensor. The effect of being able to be obtained.

It is a block diagram of a signal processing system. It is explanatory drawing of operation | movement of a signal processing system. It is explanatory drawing of the waveform of a shock wave signal. It is a typical explanatory view of operation of a signal processing system. 3 is a configuration diagram of a resonance signal processing unit 20. FIG. It is explanatory drawing of the comparison of a prior art and this invention. It is an external view of the headboard 4 It is an external view of the head board 4 incorporating the mute member 3. 1 is an external view of a drum head unit 1. FIG. 2 is an external view of a bottom case 11. FIG. 2 is a schematic explanatory diagram of an external appearance of an electronic drum 200. FIG. 3 is a plan view of the head board 4. FIG. It is explanatory drawing of an effect | action of the headboard.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Hereinafter, the “signal processing system” incorporated in the electronic drum will be described first, and then the characteristic structure will be described to facilitate the understanding of the present invention.

(Signal processing system)
FIG. 1 is a configuration diagram of a signal processing system of an electronic drum 200 according to an embodiment of the present invention. This signal processing system analog-digital converts the shock wave signal (Su) output from the vibration pickup 15 that outputs an amplitude signal corresponding to the vibration amplitude of the striking surface 2 when the striking surface 2 is hit as shown in FIG. An A / D converter 10, a resonance system signal processing unit 20 that inputs this analog-digital converted digital signal, a PCM system signal processing unit 30 that inputs this digital signal, and an output from the resonance system signal processing unit 20 A gain 60 for amplifying the signal, a gain 62 for amplifying the output signal from the PCM system signal processor 30, a mixer 65 (mixing means) for mixing the output signals from both gains 60 and 62, and a mixed mixing signal D / A converter 40 for digital-to-analog conversion, and a speaker for emitting the analog signal converted to digital analog as electronic drum sound Has a 0 and. In addition, a signal (for example, an electronic drum reverberation sound, etc.) obtained by recording an actual percussion instrument sound or the like in advance in the memory 70 is recorded in the memory 70, and the PCM signal processing unit 30 reads a recorded signal from the memory 70 at a predetermined time. And output for playback. In addition, the gain 60 and the gain 62 can be individually adjusted with a control unit (not shown). In the configuration example shown in FIG. 1, a portion excluding the speaker 50 constitutes the signal processing circuit 100 and the signal processing circuit 100 is built in the electronic drum 200 as described later. 50 itself may also be incorporated in the electronic drum 200, and a striking sound may be emitted from a mesh member provided on the outer surface of the electronic drum 200.

  The resonance system signal processing unit 20 is configured to be supplied with an output from the pressure sensor 300. The pressure sensor 300 has a thin cylindrical shape in appearance, and when the striking surface 2 of the drum head 1 is pressed and its upper circular surface is pressed, a signal corresponding to the pressing force is output. It is configured. Specifically, when the pressure sensor 300 is pressed, the resistance value changes according to the strength of the pressing force, and the pitch, volume, etc. of the impact sound signal are changed according to the change in the resistance value. Be controlled. In the present embodiment, pitch control (pitch control) is described as an example, but volume control, tone color control, and the like may be performed. FIG. 5 is a configuration diagram illustrating a configuration example of the resonance system signal processing unit 20 of FIG. The resonance system signal processing unit 20 includes a variable delay circuit 320 whose delay time is variably controlled, a phase shifter 330 that shifts the phase of the variably controlled signal, and an output signal from the phase shifter 330. A filter 340 that executes a required filtering process, a multiplier 350 that multiplies the signal output from the filter 340 by a coefficient, an output signal from the multiplier 350 and a shock wave signal that is an output signal from the vibration pickup 15. The addition result of the adder 310 is the output of the resonance signal processing unit 20. The output signal of the pressure sensor 300 is supplied to the variable delay circuit 320, and the variable delay circuit 320 adjusts the delay amount of the input signal according to the signal from the pressure sensor 300, thereby enabling pitch control. Yes. Thus, the electronic drum is capable of pitch control based on a signal output when a pressing force is applied to the circular surface of the pressure sensor 300.

(Operation of signal processing system)
Next, the operation of the signal processing system will be described. Now, when the striking surface 2 is hit with a drum stick or a hand and the vibration pickup 15 detects a shock wave signal (Su), the shock wave signal (Su) is converted from analog to digital by the A / D converter 10, and both signals It is supplied to the processing units 20 and 30. The resonance system signal processing unit 20 performs noise removal processing on the shock wave signal (Su), and outputs, for example, a signal having a frequency matching the resonance frequency and a harmonic signal having the resonance frequency. Then, this is amplified by the gain 60 and input to the mixer 65. When the signal from the PCM signal processing unit 30 is also input to the mixer 65, both are mixed and the mixed signal is converted from digital to analog by the D / A converter 40, and the musical tone signal of the electronic drum is emitted from the speaker 50. It will be.

  Next, with reference to FIG. 2, the operation from when the PCM signal processor 30 receives the shock wave signal (Su) to when it is output will be described. First, in step S200, an envelope signal of a shock wave signal is generated. Next, in step S210, it is determined whether or not the generated envelope signal exceeds a predetermined threshold value (th). Only when it is determined that there is an object exceeding this threshold (th) (Yes in step S210), the process proceeds to step S220 to determine whether or not the peak has been detected. The process ends at (No in step S210).

  In step S220, when a peak is detected (Yes in step S220), the process proceeds to step S230. In other cases (No in step S220), the process ends. In step S230, a PCM trigger is generated and a PCM signal playback function is activated. In response to this, the recording signal in the memory 70 is reproduced and output to the gain 62, and the gain 62 amplifies the PCM signal and supplies it to the mixer 65. As described above, it is possible to reproduce and output the reverberant sound recorded by the PCM method after detecting a more accurate attack level after taking a sufficient time.

  FIG. 4 is a diagram schematically illustrating the above processing flow. When the shock wave signal (Su) is generated and supplied as indicated by symbol A, a resonance signal is generated as indicated by symbol B, and a PCM signal is also generated as indicated by symbol C. As shown in D, the sound is mixed and emitted as a musical tone signal of the electronic drum. In the signal waveform indicated by the symbol C, a reverberation signal such as a shell recorded by the PCM method is such that a sound signal appears after a silence period of a predetermined time T has elapsed since the PCM trigger was generated. Thus, by mixing the resonance system signal and the PCM system signal, it is possible to emit a realistic performance sound by the operation of the signal processing system.

(Construction)
Next, the structure of the electronic drum 200 will be described with reference to FIGS. 7, 8, 9, 10, and 12. FIG. 11 is a schematic explanatory view of the appearance of an electronic drum 200 according to an embodiment of the present invention. When the head board 4 on which the mute member 3 (elastic body) shown in FIG. 8 is mounted is incorporated in the bottom case 11 shown in FIG. 10, and the bottom case 11 is closed by the drum head portion 1 shown in FIG. Thus, an electronic drum 200 having an appearance as shown in FIG. The electronic drum 200 has a simple structure that can be configured with such a small number of parts.

  FIG. 9 is a schematic explanatory view of the appearance of the drum head unit 1. As shown in FIG. 9, the drum head portion 1 is configured to have a circular striking surface 2 in a plan view on its upper surface. A step 17 is provided below the outer periphery of the drum head portion 1, and the portion of the step 17 is configured to fit into a bottom case 11 described later.

  FIG. 7 is a schematic explanatory view of the appearance of the head board 4, and FIG. 12 is a plan view of the head board 4. The head board 4 also has a circular shape in plan view, and six holes 6 are formed substantially uniformly on the outer periphery thereof, and the holes 6 are also formed at the center position. This can be realized with steel plates and plastic materials. The head board 4 has seven notches 7 formed therein. As shown in FIG. 12, the cutout portion 7 includes an X portion that is a portion from the outer peripheral edge of the headboard 4 toward the center portion of the headboard 4 (substantially central portion: not necessarily strictly the center), A Y portion that is a portion that is directed in a direction substantially perpendicular to the X portion (in other words, circumferential direction: may not be strictly “vertical”), and a R portion that is a circular portion formed at the tip of the Y portion. 18, and as a result, a support portion 17 is formed in which a hole 6 penetrating through the tip end portion is provided. Thus, the outer peripheral portion of the headboard 4 has a structure in which a plurality of support portions 17 having a reverse L-shape in plan view (L-shaped upside down) are provided. Note that the number of the support portions 17 may be at least three, and the plan view may not be an inverted L shape but may be an L shape literally. In addition, a cutout portion 8 having a “U” shape in plan view is also formed in a part of the outer peripheral portion of the headboard 4.

FIG. 8 is a schematic explanatory view showing a state in which the circular mute member 3 is placed on the head board 4 in a plan view. At the center of the mute member 3, together with the hole 9 corresponding to the hole 6 of the center portion of the headboard 4 is formed, the position corresponding to the notch 8 of the headboard 4 straight to the circle A part of has been removed. The holes 6 and 9 are used for positioning the head board 4 and the mute member 3. Further, the notches 8 and the linear cuts of the mute member 3 corresponding to the cutouts 8 are considered in consideration of the mounting of a vibration pickup 15 described later. Basically, the mute member 3 has a circular shape in plan view. It is also preferable for manufacturing. The mute member 3 can be realized by an elastic body such as rubber or low-foam urethane, and the radius of the circular mute member 3 in plan view is set smaller than the radius of the striking surface of the drum head portion 1.

  FIG. 10 is a schematic explanatory view of the outer appearance of the bottom case 11 that becomes the trunk body (shell) of the electronic drum 200. The bottom case 11 is provided with a column 12 having a hole 12 formed at the tip so as to correspond to the seven through-holes 6 of the headboard 4, for example, injection molding using a plastic material or the like. Can be manufactured in one piece. The vibration pickup 15 is fixed on a base 14 provided in the bottom case 11, and the signal processing circuit 100 (see FIG. 1) described above is provided on the flat stage 16 existing inside the bottom case 11. Is fixed. Further, the pressure sensor 300 is disposed on the flat stage 18 present at the center position inside the bottom case 11. When the speaker 50 exists outside the electronic drum 200, the signal line from the signal processing circuit 100 extends to the outside through a through hole (not shown) provided in the outer wall of the bottom case 11, so that the external What is necessary is just to set it as the structure connected to the speaker 50 of this.

  The headboard 4 on which the mute member 3 shown in FIG. 8 is placed is placed from the upper side of the bottom case 11 configured in this manner, and the holes of the columns 12 corresponding to the holes 6 on the outer peripheral portion of the headboard 4. And screw. At this time, the vibration pickup 15 fixed to the base 14 provided on the bottom case 11 extends upward through the notch 8 (see FIGS. 7 and 8), and is opposite to the striking surface 2 of the drum head 1. Closely fixed to the surface of Then, from above, the drum head portion 1 shown in FIG. 9 is covered and fixed to the bottom case 11 by an appropriate method. As this fixing method, a screw is formed inside the stepped portion 17 of the drum head 1 and a screw corresponding to the formed screw is also formed on the outer peripheral portion of the bottom case 11 so that the entire drum head 1 is formed. Or a hole is provided in the step 17 portion of the drum head 1 and a corresponding hole is also provided in the bottom case 11 side, and both are screwed. It is done.

(Function)
When a pressing force is applied by hand or the like to the striking surface 2 of the electronic drum 200 having such a structure, the head board 4 is pressed through the mute member 3 as an elastic body. At this time, each support portion 17 of the headboard 4 is bent and lowered, but the circular area surrounded by the support portion 17 of the headboard 4 is lowered uniformly, and only the pressed region is lowered. Things will disappear. FIG. 13 is a schematic explanatory view of this state (however, the mute member 3 is not shown for easy understanding), and the horizontal dotted line shows the head board 4 before being pressed. When the head board 4 is pressed by the pressing of the striking surface 2 (see symbol F), the support portion 17 of the head board 4 bends downward, but the other surfaces are uniformly lowered as a whole. . At this time, the whole headboard 4 except the support portion 17 is uniformly lowered regardless of the location of the headboard 4 (striking surface 2). As a result, according to the electronic drum 200 of the embodiment of the present invention, as shown in FIG. 6 (b), the upper circular surface area of the pressure sensor 300 (see the hatched portion in FIG. 6 (b)) is a conventional device. It's much smaller and better. Moreover, when the headboard 4 is lowered, the pressing force concentrated on the support portion 17 can be diverged by the R portion 18 of the notch portion 7. As a result, the headboard 4 is made of a plastic material or the like and has sufficient strength. It can be secured.

  Therefore, according to the embodiment of the present invention, the outer periphery of the headboard 4 on which the mute member 3 (elastic body) that is in close contact with the surface opposite to the striking surface 2 of the drum head 1 is placed in an inverted L shape in plan view. Since three or more support portions 17 formed of the notch portion 7 (which may be L-shaped) are provided and each of the plurality of support portions 17 is fastened to the bottom case 11 with screws (fastening means). When the headboard 4 is pressed by pressing the striking surface 2, the support portion 17 fastened by the screw is lowered in a bent state while the entire headboard is integrally lowered in a flat state. Therefore, it is not necessary to provide the pressure sensor 300 having a surface area as large as the area of the striking surface 2. Thus, even if the small pressure sensor 300 is used, the electronic drum 200 having a simple configuration capable of easily performing various controls such as pitch control can be realized by pressing the striking surface 2 with a hand or the like.

  The number of support portions 17 provided on the head board 4 is not limited to seven, and may be three or more. Further, the shape of the mute member 3 does not need to be a complete circle in plan view, and may be another shape such as a slightly elliptical shape.

  As described above, the present invention can be used as an electronic drum.

DESCRIPTION OF SYMBOLS 1 Drum head part 2 Impact surface 3 Mute member 4 Head board 6 Hole 7 Notch part 8 Notch part 9 Hole 10 A / D converter 11 Bottom case 12 Support | pillar 13 Hole 15 Vibration pick-up 16 Stage 17 Support part 20 Resonance system signal processing part 30 PCM signal processor 40 D / A converter 50 Speaker 60 Gain 62 Gain 65 Mixer 100 Signal processing circuit 200 Electronic drum 300 Pressure sensor

Claims (3)

In an electronic drum capable of emitting a striking sound that has been subjected to required control based on a signal from a pressure sensor that is pressed by pressing a striking surface that is the upper surface of the drum head part
An elastic body in close contact with the surface opposite to the striking surface of the drum head part;
A headboard on which the elastic body is placed;
A bottom case provided with the pressure sensor so as to face the headboard,
Three or more support portions formed by L-shaped notches that are L-shaped or L-shaped in a plan view are provided on the outer periphery of the headboard, and each of the plurality of support portions is provided. An electronic drum, wherein the electronic drum is fastened to the bottom case by fastening means. The electronic drum according to claim 1,
A hole is provided on each distal end side of each of the plurality of support portions, and a pillar having holes corresponding to the respective holes is provided on the bottom case, and the holes on the distal end side of the support portion are formed using screws. An electronic drum, wherein a bottom case side support hole is fastened. The electronic drum according to claim 2,
The notch is
A portion (X portion) heading from the outer peripheral edge of the headboard to the substantially central portion of the headboard, a portion heading in a direction substantially perpendicular to the X portion (Y portion), and a circular shape formed at the tip of the Y portion A portion (R portion),
The electronic drum is characterized in that the support part is constituted by the notch part.

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