JP5245100B2 - Electronic drum - Google Patents

Description

  The present invention provides an electronic drum that detects vibration of a striking surface due to striking against a striking surface of a drum head unit as a shock wave signal by a vibration pickup, performs signal processing based on the detected shock wave signal, and emits a striking sound. Regarding improvement.

  Various proposals have been made for the mute function of an electronic drum. For example, an elastic body such as rubber (also referred to as “mute member” as appropriate) is provided in close contact with the back side of the drum head, and a vibration pickup is disposed below the elastic body. However, according to this configuration, the hitting sound on the high frequency side is removed by the presence of the elastic body, so that it is far from playing a live musical instrument. Therefore, a gap is provided on the back side of the drum head so that a low frequency component to a high frequency component of the hitting sound can be obtained uniformly, and the vibration pickup is connected to the drum main body (shell) side of the electronic drum, that is, the drum head. An electronic drum that has been improved in frequency characteristics by being provided on the end side has been proposed (see, for example, Patent Document 1).

JP 7-295561 A

  Certainly, according to this electronic drum, the frequency characteristics are improved and a low frequency component to a high frequency component of the hitting sound can be obtained uniformly, but in order to secure a gap on the back side of the drum head, It has been difficult to adjust the vertical position of the soundboard fixed to the support portion extending from the shell and the impact material provided on the soundboard, and costs and man-hours are required in the manufacturing process. In addition, since the impact material is made of foamed rubber or the like, static electricity is likely to be generated, and the impact material and the drum head may come into contact with each other due to the electrostatic force, and there may be no gap. As a result, the performance of electronic drums had to be lacking in reality.

  The present invention has been made to solve such a conventional problem, and an object thereof is to provide an electronic drum capable of enjoying a realistic performance with a simple configuration.

In order to achieve the above object, the present invention detects vibration caused by striking the striking surface, which is the upper surface of the drum head portion, as a shock wave signal by a vibration pickup, and performs signal processing based on the detected shock wave signal for sound emission. In the electronic drum that made possible,
A circular elastic body having a radius smaller than the radius of the opposite surface of the impact surface is concentrically formed with the opposite surface of the circular impact surface on a circular surface opposite to the impact surface of the drum head portion. , Close contact,
When the drum head portion is viewed in plan, the vibration body is in close contact with a surface opposite to the striking surface of the drum head portion in a hollow disk-like elastic body non-existing region, which is a region where the elastic body does not exist. Provided a pickup ,
A headboard is provided to place and fix the elastic body,
A plurality of holes are formed in the outer peripheral portion of the headboard to be incorporated into the bottom case serving as the drum body, and a hole is formed at the tip of the bottom case so as to correspond to each of the plurality of holes. It was made to be characterized by having the support | pillar which was made.

  According to this configuration, when hitting the elastic body absence region of the striking surface, the hitting sound includes a lot of high frequency components, while when hitting the elastic body existence region other than the elastic body absence region, the high frequency component is reduced. As a result, it is possible to emit a performance sound close to that of a live musical instrument. Thus, an electronic drum capable of enjoying a realistic performance can be realized with a simple configuration.

  According to the present invention, it is possible to realize an electronic drum that can enjoy a realistic performance with a simple configuration.

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. 2 is a schematic explanatory view of a cross section of an electronic drum 200. FIG. 2 is a schematic explanatory view of a plane of an electronic drum 200. FIG. 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.

  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.

(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 even by the operation of the signal processing system.

(Construction)
Next, the structure of the electronic drum 200 will be described with reference to FIG. 7, FIG. 8, FIG. 9, and FIG. 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 provided with the mute member 3 shown in FIG. 8 is incorporated in the bottom case 11 shown in FIG. 10, and the bottom case 11 is closed with the drum head 1 shown in FIG. 9, the bottom case 11 is closed as shown in FIG. An electronic drum 200 having an appearance can be realized. 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. 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. The notch 7 extends slightly from the outer peripheral edge of the headboard 4 toward the substantially central portion of the headboard 4, and the tip is longer than the slightly extended portion so as to be substantially perpendicular to the slightly extended portion. As a whole, the cutout portion 7 has an L shape in plan view. Further, a cutout portion 8 having a “U” shape in plan view is 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. A hole 9 corresponding to the hole 6 at the center of the head board 4 is formed at the center of the mute member 3, and the position corresponding to the notch 8 of the head board 4 is linearly circular. Some have been removed. The holes 6 and 9 are used for alignment between 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 support column 12 having a hole 12 formed at the tip so as to correspond to the seven holes 6 of the headboard 4. For example, the bottom case 11 is integrally formed by injection molding using a plastic material or the like. Can be manufactured. 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. 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, and the external speaker 50 may be configured to be connected.

  The headboard 4 on which the mute member 3 shown in FIG. 8 is placed and fixed is placed on the upper side of the bottom case 11 configured as described above, and each hole 6 and the corresponding hole of the column 12 are screwed. 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.

  Thus, the cross-sectional structure of the electronic drum 200 looks like the schematic cross-sectional view shown in FIG. 5 (note that the base 14, the bottom case 11 and the like are not shown in this figure for easy understanding). That is, the mute member 3 is provided in close contact with the surface opposite to the striking surface 2 of the drum head portion 1, and the head board 4 is further provided so that the mute member 3 is placed and fixed. The vibration pickup 15 is provided in close contact with the surface opposite to the striking surface 2 of the drum head 1 in an elastic body absence region where the mute member 3 does not exist. FIG. 6 is a schematic plan view of this structure. In the drawing, the hatched portion is an elastic body existence area, and the vibration pickup 15 is provided in an elastic body absence area other than this area. I understand.

  Therefore, according to the structure of the electronic drum 200 of the embodiment of the present invention, when the elastic body absence region of the striking surface 2 is struck, the striking sound contains a lot of high frequency components, while in the region other than this elastic body absence region. When a certain elastic body existence region is hit, the high frequency component decreases. That is, in the example of FIG. 6, when hitting the center of the hitting surface 2, a soft hitting sound is emitted, while when hitting a portion near the outer periphery of the hitting surface 2, a hard hitting sound is emitted. The As a result, it is possible to emit a performance sound close to that of a live musical instrument. Thus, an electronic drum capable of enjoying a realistic performance can be realized with a simple configuration. Further, since the mute member 3 is provided, a mute function for hitting is ensured.

  Note that 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. In short, any configuration may be employed in which the mute member 3 is present substantially at the lower center of the striking surface 2 and the region where the mute member 3 is absent is present in the lower portion near the outer periphery of the striking surface 2.

  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 20 Resonance system signal processing part 30 PCM system Signal processor 40 D / A converter 50 Speaker 60 Gain 62 Gain 65 Mixer 100 Signal processing circuit 200 Electronic drum

Claims (1)

In an electronic drum that detects vibration as a shock wave signal by a vibration pickup with respect to a striking surface that is an upper surface of the drum head portion, and performs signal processing based on the detected shock wave signal to enable sound emission.
A circular elastic body having a radius smaller than the radius of the opposite surface of the impact surface is concentrically formed with the opposite surface of the circular impact surface on a circular surface opposite to the impact surface of the drum head portion. , Close contact,
When the drum head portion is viewed in plan, the vibration body is in close contact with a surface opposite to the striking surface of the drum head portion in a hollow disk-like elastic body non-existing region, which is a region where the elastic body does not exist. Provided a pickup ,
A headboard is provided to place and fix the elastic body,
A plurality of holes are formed in the outer peripheral portion of the headboard to be incorporated into the bottom case serving as the drum body, and a hole is formed at the tip of the bottom case so as to correspond to each of the plurality of holes. An electronic drum characterized in that a support post is provided .

Images