CN114120944A - Hook type electronic drum triggering device and electronic drum - Google Patents

Hook type electronic drum triggering device and electronic drum Download PDF

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Publication number
CN114120944A
CN114120944A CN202111646691.9A CN202111646691A CN114120944A CN 114120944 A CN114120944 A CN 114120944A CN 202111646691 A CN202111646691 A CN 202111646691A CN 114120944 A CN114120944 A CN 114120944A
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China
Prior art keywords
drum
metal
hook
ring
electronic
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Pending
Application number
CN202111646691.9A
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Chinese (zh)
Inventor
林伯龙
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Shanghai Huaxin Musical Instrument Co ltd
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Shanghai Huaxin Musical Instrument Co ltd
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Publication date
Application filed by Shanghai Huaxin Musical Instrument Co ltd filed Critical Shanghai Huaxin Musical Instrument Co ltd
Priority to CN202111646691.9A priority Critical patent/CN114120944A/en
Publication of CN114120944A publication Critical patent/CN114120944A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H3/00—Instruments in which the tones are generated by electromechanical means
    • G10H3/12—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument
    • G10H3/14—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means
    • G10H3/146—Instruments in which the tones are generated by electromechanical means using mechanical resonant generators, e.g. strings or percussive instruments, the tones of which are picked up by electromechanical transducers, the electrical signals being further manipulated or amplified and subsequently converted to sound by a loudspeaker or equivalent instrument using mechanically actuated vibrators with pick-up means using a membrane, e.g. a drum; Pick-up means for vibrating surfaces, e.g. housing of an instrument
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10D—STRINGED MUSICAL INSTRUMENTS; WIND MUSICAL INSTRUMENTS; ACCORDIONS OR CONCERTINAS; PERCUSSION MUSICAL INSTRUMENTS; AEOLIAN HARPS; SINGING-FLAME MUSICAL INSTRUMENTS; MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR
    • G10D13/00—Percussion musical instruments; Details or accessories therefor
    • G10D13/10—Details of, or accessories for, percussion musical instruments
    • G10D13/26—Mechanical details of electronic drums
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
    • G10H1/00—Details of electrophonic musical instruments
    • G10H1/32—Constructional details

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Electrophonic Musical Instruments (AREA)

Abstract

The invention discloses a hook type electronic drum triggering device and an electronic drum, which comprise at least 4 drum edge impact triggering components distributed in a drum barrel; each drum edge impact triggering component comprises a sensor and a metal hook; the piezoelectric ceramic plate is fixed on the metal hook; the metal hook is arranged on the inner wall of the drum, and the sensor is indirectly connected with the inner wall of the drum; the metal hook is arranged between the sensor and the vibration component at the top of the electronic drum and is in hard connection with the vibration component on the electronic drum to form a vibration signal transmission path of the sensor. According to the scheme, the piezoelectric ceramic piece is hung on the inner wall of the drum through a metal hook type fixing method, and the metal has good signal conduction performance, so that the signal conduction performance is improved.

Description

Hook type electronic drum triggering device and electronic drum
Technical Field
The invention relates to the technical field of musical instrument manufacturing, in particular to an electronic drum of a hook type electronic drum disk triggering device.
Background
Drum discs of electronic drums on the market generally have functions of drum surface striking and drum edge striking, and the functions are usually realized by converting analog signals into electric signals through piezoelectric ceramic plates (sensors) arranged inside and then distinguishing the drum edge from the drum surface through distinguishing the signals through a sound source controller.
The existing electronic drum is provided with two piezoelectric ceramic pieces for sensing signals of a drum surface and a drum edge, and the piezoelectric ceramic pieces of the drum surface are arranged on the drum surface through connecting and fixing pieces. When the drumstick strikes the drumhead, the piezoelectric ceramic sheet of the drumhead can sense the vibration signal and then converts the vibration signal into an electric signal to be sent to the sound source controller, and the sound source controller distinguishes the striking of the drumhead through the built-in chip.
The piezoelectric ceramic plates on the drum edge are usually directly arranged on the inner wall of a drum cavity, the drum rod is used for beating a certain point of a drum rubber ring, then a vibration signal generated by beating of the drum rod is transmitted to a drum metal pressing ring through the rubber ring and then transmitted to the inner wall of the drum cavity through the metal pressing ring, the piezoelectric ceramic plates arranged on the inner wall of the drum cavity are converted into electric signals after sensing the vibration signal and then transmitted to a sound source controller, and the sound source controller distinguishes beating of drum edge beating through a built-in chip.
At present, the electric drum on the market basically adopts a single piezoelectric ceramic piece to sense a knocking signal, the piezoelectric ceramic piece on the edge of the drum is usually arranged on one side of the inner wall of a drum cavity, so that the size of the knocking signal is influenced by the distance between a knocking point and the piezoelectric ceramic piece when the electric drum is used for knocking, and when the knocking point is closer to the installation position of the piezoelectric ceramic piece, the sensed signal is stronger, and the sound can make a special sound. When the knocking point is far away from the installation position of the piezoelectric ceramic piece, the signal is weak, and the sound is particularly light. Therefore, when the drum is hit, the electric signals generated when the drum is hit at different positions have different magnitudes, so that signal conduction is uneven, and the beating effect of beating at the edge of the drum is not ideal.
Therefore, how to improve the conduction performance of the electronic drum trigger signal is a problem to be solved in the field.
Disclosure of Invention
Aiming at the technical problem that the signal conductivity of the existing electronic drum trigger signal is low, the technical scheme aims to provide the hook type electronic drum trigger device.
In order to achieve the purpose, the hook type electronic drum triggering device provided by the invention comprises at least 4 drum edge impact triggering components which are distributed in a drum barrel; each drum edge impact triggering component comprises a sensor and a metal hook; the piezoelectric ceramic plate is fixed on the metal hook; the metal hook is arranged on the inner wall of the drum, and the sensor is indirectly connected with the inner wall of the drum; the metal hook is arranged between the sensor and the metal component on the top of the electronic drum and is in hard connection with the metal component on the electronic drum to form a vibration signal transmission path of the sensor.
Further, the metal hook is divided into a bearing part and a hook part; the bearing part is connected with the hook part in a matching way; the bearing part is fixed with the sensor and fixed on the inner wall of the drum; the hook part is arranged on the edge of the upper port of the drum.
Further, the bearing part and the hook part are not in the same plane.
In order to achieve the above object, the present invention provides an electronic drum, which includes the above hook-type electronic drum triggering device.
Furthermore, the electronic drum also comprises a drum barrel, a drum surface and a metal drum ring; the drum surface is arranged on the drum, and an inner metal ring at the edge of the drum surface is attached to the hook part of the metal hook at the edge of the drum; the metal drum ring is sleeved on the drum surface; the metal hook, the metal inner ring at the edge of the drumhead and the metal drum ring are in hard connection to form a vibration signal transmission path of the sensor.
Furthermore, drum ring rubber is arranged on the metal drum ring; the drum ring rubber, the metal drum ring and the drum surface are connected in a matching mode to form an upper assembly of the electronic drum.
Further, a bottom drum surface is buckled at the bottom of the drum barrel; the bottom drum surface is sleeved with a bottom metal drum ring, and the bottom drum surface is connected with the drum barrel through the metal drum ring; and the bottom drum surface and the bottom metal drum ring are connected in a matching way to form a lower component of the electronic drum.
Furthermore, a plurality of drum lugs are symmetrically arranged outside the drum barrel and are respectively matched and connected with the metal drum ring and the bottom metal drum ring.
Furthermore, the inner wall of the drum is also provided with a signal output socket and a PCB; the PCB is connected with the signal output socket to form a signal processing and transmitting structure.
Furthermore, a drumhead trigger assembly is arranged inside the drum barrel and is connected with the PCB for signal transmission; the drumhead trigger assembly, the PCB and the signal output socket are connected to form a processing and transmitting structure of the drumhead trigger signal.
According to the hook type electronic drum triggering device provided by the invention, the piezoelectric ceramic piece is hung on the inner wall of the drum barrel by a metal hook type fixing method, and the signal conduction performance is improved by utilizing the good signal conduction performance of metal;
simultaneously, this scheme increases 1 original preforming potsherd to 4 to distribute in the different positions in drum limit, can guarantee that the drum dish is strikeed when beating, received signal's the degree of consistency.
Drawings
The invention is further described below in conjunction with the appended drawings and the detailed description.
Fig. 1 is a schematic structural diagram of a drum edge impact trigger component in the hook-type electronic drum triggering device;
fig. 2 is an exploded view of the structure of the drum edge impact trigger component in the hook-type electronic drum triggering device;
fig. 3 is an exploded view of the overall structure of the hook-type electronic drum triggering device;
fig. 4 is a schematic view of the overall structure of the drum in the hook-type electronic drum triggering device.
The following are labeled descriptions of the components in the drawings:
1. the drum comprises a drum rubber ring 2, a metal drum ring 3, a drum surface 4, a drum edge impact trigger component 5, a drum surface trigger component 6, a drum lug 7, a bottom drum surface 8, a bottom metal drum ring 9, a square head screw 10, a signal output socket 11, a drum 12, a PCB board 13, a piezoelectric ceramic piece 14, a double faced adhesive tape 15 and a metal hook.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Aiming at the technical problem that the signal conductivity of the existing electronic drum trigger signal is low, based on the technical problem, the scheme provides the hook type electronic drum trigger device.
The hook type electronic drum triggering device provided by the scheme is shown in the figures 1-2, and comprises at least 4 groups of drum edge impact trigger components 4 which are distributed in drums 11.
The drum edge beating trigger component 4 is used for conducting signals generated when the drum edge is beaten; compare in prior art adoption a sensor, this scheme adopts 4 at least drum limits to hit trigger subassembly 4, and the symmetry sets up respectively in the different positions of drum 11 inner wall, can guarantee that the signal size that can both guarantee the sensor received when beating the drum limit in different positions is even.
Each drum edge impact trigger component 4 has the same structure, and each drum edge impact trigger component 4 is composed of a piezoelectric ceramic piece 13, a double-sided adhesive tape 14 and a metal hook 15.
The piezoelectric ceramic sheet 13 is a sensor, is used for receiving a vibration signal generated when the edge of the drum is knocked, and is fixed on the metal hook 15 through a double-sided adhesive 14.
The metal hook 15 is divided into two parts, one part is a bearing part and is used for fixing the piezoelectric ceramic piece 13 and indirectly connecting the piezoelectric ceramic gasket 13 with the inner wall of the drum 11; the other part is a hook part for hanging on the drum 11. Wherein, the bearing part and the hook part are not on the same plane.
Meanwhile, the metal hook 15 is arranged between the piezoelectric ceramic gasket 13 and a metal component on the top of the electronic drum, and forms a hard connection with the metal component on the electronic drum to form a vibration signal transmission path of the piezoelectric ceramic gasket 13.
In summary, the metal hook 15 in the present scheme can play two roles, the piezoelectric ceramic plate 13 is fixed on the metal hook 15 and connected with the inner wall of the drum 11; on the other hand, when the metal hook 15 is installed, the arc surface on the hook part is in hard contact with the metal ring at the edge of the drum surface 3 and the metal drum ring 2 in sequence, and a transmission path of a vibration signal of the piezoelectric ceramic gasket can be formed.
Meanwhile, the double-sided adhesive tape 14 is preferably a 3M double-sided adhesive tape, which has an excellent adhesive effect and can further secure the connection between the piezoelectric ceramic plate 13 and the metal hook 15, thereby ensuring the reliability of the drum edge impact trigger assembly in application.
The drum edge beating trigger component 4 is composed of a piezoelectric ceramic piece 13, a double-sided adhesive tape 141 and a metal hook 15, and when the drum edge beating trigger component 4 with the structure is installed, the 4 drum edge beating trigger components 4 are symmetrically hung on the inner wall of the drum 11 respectively.
In order to further ensure good signal conduction between the edge impact trigger component 4 and the drum 11, after the edge impact trigger component 4 is suspended on the inner wall of the drum 11, the edge impact trigger component 4 needs to be tightly attached and fixed to the inner side of the drum 11 by using a double-sided adhesive tape 14.
When the hook type electronic drum triggering device is applied, the hook type electronic drum triggering device is distributed inside an electronic drum, and in order to better explain the triggering device, the electronic drum is introduced to carry out auxiliary explanation in the scheme.
The electronic drum comprises the hook type electronic drum trigger component 4, referring to fig. 3-4, and further comprises a drumhead trigger component 5, a drum barrel 11, a plurality of drum ears 6, a signal output socket 10, a drum rubber ring 1, a metal drum ring 2, a drumhead 3, a bottom drumhead 7, a bottom metal drum ring 8 and a PCB board 12.
The drum ears 6 are symmetrically arranged on the outer wall of the drum barrel 11, and can be conveniently carried by an operator through the drum ears 6.
The drumhead trigger component 5 is arranged in the drum 11 and fixed on the edge of the drum 11, and the PCB 12 is arranged at the bottom of the drumhead trigger component 5; the drumhead trigger component 5 is connected with the PCB 12 through a cable and is used for transmitting the drumhead trigger signal to the PCB 12 for signal processing and amplification.
The signal output socket 10 is arranged on the inner wall of the drum 11; the PCB 12 is connected to the socket on the signal output socket 10, and the drumhead trigger signal can be processed and amplified by the PCB 12 and then output.
Further, at least 4 drum edges hit the trigger component 4 and are symmetrically suspended on the inner wall of the drum 11; and 4 trigger subassembly 4 are hit to drum limit with the cable connection, connect the cable with PCB board 12 after connecting, can give PCB board 12 with the vibration signal transmission that the drum limit triggered and handle the amplification, PCB board 12 is connected with the plug wire seat on the signal output socket 10, can handle the amplification with the drum limit trigger signal through PCB board 12 and export.
4 drum limit hits trigger subassembly 4 symmetry and installs the back, presses drumhead 3 on drum 11 for the metal ring of drum face edge round is inboard to closely laminate with the arcwall face at metal hook 15 hanging edge in 4 drum limit hits trigger subassembly 4, keeps hard contact.
Meanwhile, the edge of the drum surface 3 and the edge of the drum barrel 11 are sleeved with the metal drum ring 2, the bottom of the metal drum ring 2 is correspondingly provided with a clamping groove, the arc-shaped surface of the metal hook 15 at the edge of the drum barrel 11 can be correspondingly clamped, and meanwhile, the drum surface 3 is tightly pressed.
After the pressing, 5 square-head screws 9 are used to be attached to the drum ears 6 through mounting holes in the metal drum ring 2, and then the drum rubber ring 1 is sleeved on the drum ears to complete the front mounting.
Here, the metal hook 15 structure is attached to the three of the drum surface metal inner ring and the metal drum ring 2 to form hard contact, so that conduction of the drum edge vibration signal is realized. Meanwhile, the three are made of metal, and the metal has excellent signal conductivity, so that the conductivity of the edge of the whole drum in the knocking process can be guaranteed.
The bottom drum surface 7 is buckled at the bottom of the drum barrel 11 and sleeved with a bottom metal drum ring 8, and 9 square-head screws 9 are attached to the drum ears 6 through mounting holes in the bottom metal drum ring 8 to complete the reverse side mounting.
The following illustrates the assembly process of the present solution in use; it should be noted that the following description is only a specific application example of the present solution and is not intended to limit the present solution.
Firstly, installing a signal output socket 10 and a drumhead trigger component 5 in a drum 11, and arranging a PCB 12 at the bottom of the drumhead trigger component 5 and connecting the PCB with the signal output socket 10; the drumhead trigger assembly 5 is connected to the PCB board 12.
Meanwhile, 4 drum edge trigger components 4 are symmetrically suspended on the inner wall of the drum 11 respectively, and the 4 drum edge trigger components 4 are connected with the PCB 12 after being connected through cables.
The drumhead 3 is pressed on the edge of the drum 11, and a metal inner ring inside the drumhead 3 is attached to a metal hook 15 in the drumhead trigger component 4; sleeving the metal outer ring 2, pressing and connecting the metal outer ring 2, the drum surface 3 and the drum 11 through screws, and simultaneously attaching the metal outer ring 2 to a metal hook 15 in the drum edge impact trigger component 4; the metal hard connection of the three parts realizes the conduction of the drum edge vibration signal.
Sleeving a drum rubber ring 1 on the metal drum ring 2 to finish front installation; and respectively buckling a bottom drum surface 7 and a bottom metal drum ring 8 at the bottom of the drum barrel 11 and locking the drum surfaces and the drum ears 6 to finish the reverse installation of the electric drum.
When the drumhead is knocked, the drumhead knocking trigger component 5 collects vibration signals and transmits the vibration signals to the PCB 12 for processing and amplification, and the vibration signals are output through the signal output socket 10 after being processed.
When beating the drum edge, 4 drum edge beating trigger subassemblies 4 of drum inner wall are based on beating different positions and are gathered and are transmitted the vibration signal for PCB board 12 and handle the amplification, export through signal output socket 10 after handling.
The hook type electronic drum triggering device comprises the piezoelectric ceramic piece, the piezoelectric ceramic piece is fixed on the inner wall of the cylinder body in a hook mode, the trigger of the metal hook structure is in hard contact with the drum surface metal inner ring and the metal drum ring, and meanwhile, metal per se has excellent signal conduction performance, so that the conduction performance of the whole drum edge in the knocking process can be guaranteed.
In addition, the number of the piezoelectric ceramic pieces on the drum edge is increased from the existing 1 to 4 or more, and when the drum edge is knocked at different positions, the signals received by the piezoelectric ceramic pieces can be ensured to be uniform in size, so that the knocking uniformity of the drum disc edge is ensured.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A hook type electronic drum triggering device is characterized by comprising at least 4 drum edge impact triggering components which are distributed in a drum barrel; each drum edge impact triggering component comprises a sensor and a metal hook; the piezoelectric ceramic plate is fixed on the metal hook; the metal hook is arranged on the inner wall of the drum, and the sensor is indirectly connected with the inner wall of the drum; the metal hook is arranged between the sensor and the metal component on the top of the electronic drum and is in hard connection with the metal component on the electronic drum to form a vibration signal transmission path of the sensor.
2. The hook-type electronic drum triggering device according to claim 1, wherein the metal hook is divided into a bearing part and a hook part; the bearing part is connected with the hook part in a matching way; the bearing part is fixed with the sensor and fixed on the inner wall of the drum; the hook part is arranged on the edge of the upper port of the drum.
3. The hook-type electronic drum triggering device according to claim 2, wherein the bearing portion and the hook portion are not in the same plane.
4. An electronic drum, comprising the hook-type electronic drum triggering device as set forth in any one of claims 1 to 3.
5. The electronic drum of claim 4, further comprising a drum shell, a drumhead, a metal drum rim; the drum surface is arranged on the drum, and an inner metal ring at the edge of the drum surface is attached to the hook part of the metal hook at the edge of the drum; the metal drum ring is sleeved on the drum surface; the metal hook, the metal inner ring at the edge of the drumhead and the metal drum ring are in hard connection to form a vibration signal transmission path of the sensor.
6. The electronic drum as claimed in claim 5, wherein a drum rim rubber is further provided on the metal drum rim; the drum ring rubber, the metal drum ring and the drum surface are connected in a matching mode to form an upper assembly of the electronic drum.
7. The electronic drum as claimed in claim 5, wherein the bottom of the drum is provided with a bottom drum surface; the bottom drum surface is sleeved with a bottom metal drum ring, and the bottom drum surface is connected with the drum barrel through the metal drum ring; and the bottom drum surface and the bottom metal drum ring are connected in a matching way to form a lower component of the electronic drum.
8. The electronic drum as claimed in claim 5, wherein a plurality of lugs are symmetrically arranged outside the drum barrel and are respectively connected with the metal drum ring and the bottom metal drum ring in a matching manner.
9. The electronic drum as claimed in claim 5, wherein the inner wall of the drum barrel is further provided with a signal output socket and a PCB board; the PCB is connected with the signal output socket to form a signal processing and transmitting structure.
10. The electronic drum as claimed in claim 4, wherein a drumhead trigger assembly is arranged inside the drum barrel and connected with the PCB for signal transmission; the drumhead trigger assembly, the PCB and the signal output socket are connected to form a processing and transmitting structure of the drumhead trigger signal.
CN202111646691.9A 2021-12-30 2021-12-30 Hook type electronic drum triggering device and electronic drum Pending CN114120944A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111646691.9A CN114120944A (en) 2021-12-30 2021-12-30 Hook type electronic drum triggering device and electronic drum

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111646691.9A CN114120944A (en) 2021-12-30 2021-12-30 Hook type electronic drum triggering device and electronic drum

Publications (1)

Publication Number Publication Date
CN114120944A true CN114120944A (en) 2022-03-01

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CN202111646691.9A Pending CN114120944A (en) 2021-12-30 2021-12-30 Hook type electronic drum triggering device and electronic drum

Country Status (1)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015138196A (en) * 2014-01-23 2015-07-30 ヤマハ株式会社 Electronic percussion instrument blow detection device
US20170236505A1 (en) * 2016-02-17 2017-08-17 Roland Corporation Electronic percussion instrument
CN111684520A (en) * 2018-02-05 2020-09-18 雅马哈株式会社 Signal output device
CN111785239A (en) * 2020-07-24 2020-10-16 上海华新乐器有限公司 Electronic drum structure with uniform output
CN214175672U (en) * 2020-07-27 2021-09-10 上海华新乐器有限公司 Sound sensing device for electronic drum
CN217405103U (en) * 2021-12-30 2022-09-09 上海华新乐器有限公司 Hook type electronic drum triggering device and electronic drum

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015138196A (en) * 2014-01-23 2015-07-30 ヤマハ株式会社 Electronic percussion instrument blow detection device
US20170236505A1 (en) * 2016-02-17 2017-08-17 Roland Corporation Electronic percussion instrument
CN111684520A (en) * 2018-02-05 2020-09-18 雅马哈株式会社 Signal output device
CN111785239A (en) * 2020-07-24 2020-10-16 上海华新乐器有限公司 Electronic drum structure with uniform output
CN214175672U (en) * 2020-07-27 2021-09-10 上海华新乐器有限公司 Sound sensing device for electronic drum
CN217405103U (en) * 2021-12-30 2022-09-09 上海华新乐器有限公司 Hook type electronic drum triggering device and electronic drum

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