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JP2018508838

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2018508838
A percussion instrument comprises a drum shell, a batter head held under tension by a rim fixed
to the top of the drum shell, a flexible member supported at the bottom end of the drum shell,
and a central portion of the flexible member. A contact microphone held in part, an acoustic
transmission structure in contact with the batter head, and a drive leg coupled to the lower end
of the acoustic transmission structure. The contact microphone may be coupled to the flexible
support member with a first double-sided adhesive tape member. The foam cushion disposed
between the drive leg and the contact microphone is coupled to the upper drive leg by the
second double-sided adhesive tape member and by the third double-sided adhesive member on
the opposite lower side , Reduce unwanted microphone effects and feedback, and allow for quick
recovery of the signal from the touch microphone.
Electronic drum
[0001]
This application claims the benefit of US Application No. 14/618130, filed February 10, 2015,
which is incorporated herein by reference.
[0002]
The present disclosure relates to music percussion instruments, in particular drum sets, and
electro-acoustic transducers that convert mechanical energy generated when the instrument
head is struck into electrical signals that can be processed to drive loudspeakers. To adopt.
[0003]
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1
Spectators and musicians generally prefer the appearance, sound and, in the case of
percussionists, the feel of an acoustic drum as compared to an electronic drum.
Electronic drums having a sound comparable to an acoustic drum and having the feel of an
acoustic drum are generally very expensive and usually do not have the appearance of an
acoustic drum.
[0004]
An important advantage of the electronic drum is that it eliminates the need to properly position
the drum's mylophone which is a cumbersome and time-consuming process.
Another important advantage of the electronic drum is that it is easy to change the sound of the
drum by adjusting the settings of the electronic controller or computer.
[0005]
Attempts have been made to provide a kit for converting an acoustic drum to an electronic drum.
Such modifications are relatively easy and inexpensive, but have associated disadvantages. Such
conversions generally require permanent changes to the drum shell, such as drilled mounting
holes that degrade the appearance of the drum. Durability and profitability are generally inferior.
The availability of triggers using Styrofoam rapidly deteriorates with use, resulting in
inconsistent trigger response and ultimately rendering the conversion drum non-renewable. The
trigger used in such a conversion kit provides a very small sweet spot of about 2 inches (5 cm) in
diameter that provides poor sound quality and an acceptable drum beat location.
[0006]
An electronic drum that can give the appearance, sound and feel of an acoustic drum will be
described. The disclosed drum can be manufactured as an electronic drum, or convert the
acoustic drum without requiring permanent changes to the drum shell or associated hardware
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2
(eg, stand, drum head fasteners etc) It can be made by
[0007]
In one aspect of the present disclosure, a striking instrument is secured to the drum shell, a
flexible batter head held in tension by a first rim secured to the top of the drum shell, and a
bottom portion of the drum shell. A flexible bottom head held in tension by a second rim, a
flexible elastically compressible member supported on the bottom head, and directly supported
by the drum shell And a contact microphone disposed in the drum shell between the batter head
and the lower head, the contact microphone being between the batter head and the bottom head.
Indirectly supported by This arrangement allows the contact microphone to be axially displaced
within the drum shell from the rest position when the batter head is struck, resiliently biasing the
rest position during multiple strikes to the batter head. Be done.
[0008]
In one aspect of the present disclosure, the percussion instrument comprises a drum shell, a
batter head maintained under tension by a rim fixed to the top of the drum shell, a flexible
member supported at the lower end of the drum shell, and elastic A contact microphone held in
the center of the flexible support member, an acoustic transmission structure contacting the
batter head, and a drive leg connected to the lower end of the acoustic transmission structure.
The sound transmitting structure and the drive leg are arranged on the percussion instrument
such that the drive leg is compressed between the batter head and the flexible member with the
drive leg disposed on the contact microphone. The force from the impact on the batter head is
transmitted from the batter head to the acoustic transmission structure and from the drive leg to
the contact microphone via the acoustic transmission structure and the drive leg. The contact
microphone converts the transmitted force or pressure into an electrical signal that can be
amplified, modulated or electronically corrected prior to driving the speaker.
[0009]
In certain aspects of the present disclosure, the drum shell can have a cylindrical or frustoconical shape.
[0010]
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In one aspect of the present disclosure, the batter head is comprised of a mesh fabric that allows
air to pass through.
The mesh batter head is selected to have the resilience characteristics of a conventional acoustic
batter head.
[0011]
In one aspect of the present disclosure, the flexible member has a disk shape and is
approximately coextensive with the opening at the bottom of the drum shell.
[0012]
In one aspect of the present disclosure, the contact microphone is a piezoelectric microphone.
[0013]
In an aspect of the present disclosure, the acoustic transmission structure comprises an upper
annular surface contacting the lower annular surface of the batter head, said acoustic
transmission structure tapering towards a central region of the bottom of the drum shell. It is
formed.
As an example, the acoustic transmission structure can have an inverted frusto-conical shape.
[0014]
In one aspect of the present disclosure, the coupling between the drive leg and the sound
transmission structure is adjustable, and the compression force applied to the sound
transmission structure and the drive leg is controlled by the batter head and the flexible support
member. It is configured to change.
[0015]
In one aspect of the present disclosure, the contact microphone is held between the bottom
surface of the drive leg and the top surface of the flexible support member, and the movement
across the top surface of the flexible support member is restricted. There is.
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[0016]
In one aspect of the present disclosure, the contact microphone is bonded or adhered to a
portion of the top surface of the flexible support member using, for example, a double sided
adhesive tape or other adhesive composition.
[0017]
In an aspect of the present disclosure, a foam cushion is disposed between the bottom of the
drive leg and the top of the contact microphone.
The foam cushion may be bonded or glued to the underside of the drive leg and / or to the
contact microphone, such as with a double sided adhesive tape or other adhesive composition.
[0018]
In one aspect of the present disclosure, the contact microphone is held between the flexible
support member and the foam cushion, and the drive leg is held between the foam cushion and
the compressed foam member. There is.
[0019]
In one aspect of the present disclosure, a contact microphone, a foam cushion, a drive leg and a
compression foam member have a plurality of pins with internal threaded holes at their upper
end, and a pressure plate with an opening through which the upper end of the pin passes.
Retained on the flexible support member by a plurality of screws which engage the threaded
holes of the pins and compress the foam cushion and the compressed foam member between the
pressure plate and the flexible support member; Ru.
[0020]
In an aspect of the present disclosure, the drive leg is adjustably coupled to the lower end of the
acoustic transmission structure by an externally threaded shank, the lower end of the acoustic
transmission structure for receiving and screwing the threaded shank. It has an internal screw
hole.
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[0021]
In an aspect of the present disclosure, the acoustic transmission structure is a hollow, inverted
conical component having an opening in a conical wall to reduce or eliminate the effect of air
pressure acting on the surface of the acoustic transmission structure.
[0022]
FIG. 1 is a perspective view of a drum according to the present disclosure.
[0023]
FIG. 2 is an enlarged perspective view showing a subassembly of the drum shown in FIG.
[0024]
FIG. 3 is a perspective view of another drum having an inverted frusto-conical shape.
[0025]
FIG. 1 shows a percussion instrument (10) according to the present disclosure.
A percussion instrument or drum (10) is fixed at the upper end of the drum shell, a batter head
(14), the drum shell (12), a flexible member (16) supported at the lower end of the drum shell,
and an electronic It comprises a pressure sensor or contact microphone (18), a drive leg (20) and
a focusing cone or acoustic transmission structure (22).
[0026]
A contact microphone (18) can be coupled to a portion of the top surface of the flexible support
member (16).
Non-rigid couplings such as adhesive tape members (23) can be used to limit the unwanted
movement of the contact microphone relative to the flexible support member, and unwanted
sound pickup Prevent sound) and feedback.
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A suitable double sided adhesive tape can be comprised of a pressure sensitive, non-curable
adhesive applied to both sides of a glass fiber / polyester scrim.
Such double-sided adhesive tapes have the ability to bond dissimilar materials and dampen
vibrations.
[0027]
The drum (10), when striking the batter head (14), contacts the lower annular surface of the
batter head (14) from the batter head (14) with the upper annular surface of the acoustic
transmission structure (22) It is designed such that force is transmitted to (24).
The force is transmitted down through the acoustic transmission structure (22) and directed or
focused towards the lower end of the structure (22), via the drive leg (20) to the contact
microphone (18) Transmitted to the sensing surface of the
[0028]
The drum shell (12) can take any form, including an open frame structure, as desired.
The drum shell (12) can support a conventional cylindrical shape, an inverted frusto-conical
shape (i.e., a large frusto-conical base at the top as shown in FIG. 3) or elements of the disclosed
drum It can have any other shape.
[0029]
The batter head (14) can be made of a mesh material that allows air to pass when the batter head
is hit and prevents the generation of pressure waves.
Mesh batter heads are commercially available that provide resilience and drum feel comparable
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to conventional batter heads, and standard standard drum volume is typically used during
problematic practice.
The batter head (14) is maintained under tension by the rim.
The batter head means that it is pre-tensioned on the drum hoop that can be fixed to the drum
shell, the batter head may be pre-tuned, or use the drum key to It may be tuned by adjusting a
tension rod that is fixed to a lug fixed to the outer surface of the drum shell.
[0030]
The flexible support member (16) may be a flat disc supporting the contact microphone (18).
The flexible support member (16) is usually less flexible than the batter head (14) and more
flexible than the acoustic transmission structure (22). The flexible support member (16) can
exhibit an excellent combination of elasticity, resilience and resilience. Examples of materials
suitable for the flexible support member can include thermoplastic elastomers such as styrene
block copolymers (e.g., Kraton polymers), polyolefin blends (TPE-o), and thermoplastic
polyurethanes (TPUs). The flexible support member (16) can also be made of thin plywood-like
wood. The flexible support member (16) can include other structures such as a narrow cross
member extending across the bottom of the drum shell (12). Air openings (26) may be provided
in the flexible support (16) to allow the pressure waves to be dissipated quickly.
[0031]
The contact microphone (18) may generally be any type of microphone designed to be sensitive
to acoustic or mechanical vibrations conducted through a solid object, while being less
susceptible to vibrations propagating in the air . For example, the contact microphone (18) can
be a piezoelectric transducer (eg, a piezoelectric microphone).
[0032]
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The sound transmitting structure (22) may be any solid structure capable of transmitting the
acoustic vibrations from the batter head (14) to the drive leg (20). In order to provide a constant
volume and sound quality over the entire area of the batter head (14), it is desirable that the
sound transmitting structure (22) be symmetrical along the cylindrical axis of the drum shell. The
upper end of the sound transmitting structure (22) preferably contacts the batter head (14) along
an annular area near the edge of the batter head (14). This feature ensures that striking to almost
any location on the batter's head produces substantially the same sound. The sound transmission
structure (22) has a small drive end at the bottom of the drum shell, a large drive end at the top
of the drum shell, and a large drive end and a small driven end in contact with the batter head
(14). It has an inverted truncated cone shape (i.e., a converging cone). The driven end of the
converging cone (inverted frusto-conical shaped acoustic structure (22)) is coupled to the drive
leg (20) and arranged to transmit voice vibrations to the contact microphone (18). The inverted
frusto-conical shape of the structure (22) is such that a force is transmitted from the large drive
end at the top of the drum to the small driven end at the bottom of the drum, and this convergent
line To make the batter head (14) misdirected strike the contact microphone as if it were a totally
directed hit towards the center of the batter head (14). Bring about a pressure approximately
equal to The sound transmitting structure (22) is provided with holes or openings (27) which
allow for a rapid equalization of the air pressure, preventing sound waves from echoing through
the air inside the drum. The structure (22) can be made of a relatively rigid plastic (less flexible
than the flexible member (16)) such as poly (meth) acrylate.
[0033]
A mesh bottom head (28) held in tension by the rim can be secured to the lower end of the drum
shell (12) to support the flexible member (16). The mesh bottom head (28) may be substantially
identical to the mesh batter head (14).
[0034]
A subassembly (25) for holding the contact microphone (18) on the flexible member (16) is
shown in FIG. The acoustic contact between the drive leg (20) and the contact microphone (18) is
between the two elastically compressible members, a foam (foam) cushion 30 and a compression
foam (foam) member 32. By maintaining the drive legs (20) compressible. In the illustrated
embodiment, six pins (34) extend upwardly through the openings in the flexible member (16).
The contact microphone (18) is disposed on the flexible member (16) and the pin (34) prevents
lateral movement along the upper surface of the flexible member (16). The foam cushion (30) is
placed on the contact microphone (18) and is also prevented from moving laterally by the pin
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(34). The foam cushion (30) can generally be composed of an elastically deformable elastomeric
foam material. Located between the foam cushion (30) and the compressed foam (32) is a drive
leg 20 connected to the acoustic transmission structure 22 by a threaded shank 36. The drive leg
20 can be made of a less flexible material than the flexible member (16), the foam cushion (30)
and the compression foam member (32). Similarly, the compression plate (38) can be composed
of a relatively rigid material. The compression plate (38) is biased towards the flexible member
(16) by a screw (40) received in an internal threaded hole in the upper end of the pin (34).
Alternatively, the pin (34) can have an external thread and can use a nut rather than a screw, the
contact microphone (18), the cushion (30), the legs (20) and the compression foam between
them The plate (38) is biased towards the member (16) to compress the member (32).
[0035]
The compression foam (32) contacts the bottom side of the compression plate (38) only by
surrounding the outer circumference of the pin (34), but only at the outer edge of the pin hole
location. The foam (32) is not resting on top of the legs (20). The pin (34) is of the correct height
to allow the leg (20) to move freely up 2 mm upon completion of assembly of the coupling
device, ie the leg (20) Go over the bottom of the compression plate (38) without intervention. The
cushion (32) surrounding the pin (34) reduces the vibration of the pin (34) and clamps the pin
(34) to the leg (20). Six pins (34) coincide with the hexagonal legs (20). This will prevent the legs
(20) from rotating during operation and detune the drum.
[0036]
A foam cushion (30) can be coupled to the underside of the drive leg (20). A non-rigid bond such
as a double-sided adhesive tape member (39) can be used to limit the unwanted movement of the
foam cushion (30) relative to the drive leg (20) and prevent unwanted microphone effects and
feedback. Let's do it. Also, the foam cushion (30) can be coupled to the upper side of the contact
microphone (18). A non-rigid bond such as double-sided adhesive tape member (40) can be used
to limit unwanted movement of the foam cushion (30) relative to the contact microphone (18)
and to prevent unwanted microfocks or feedback. . The double sided adhesive tape members (39,
40) can include pressure sensitive non-curable adhesives applied to both sides of the glass fiber /
polyester scrim to facilitate adhesion and help dampen vibrations.
[0037]
The use of double-sided adhesive tape members or other non-rigid coupling members helps to
04-05-2019
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restrain or relieve the pressure applied to the contact microphones (18) and the batter head (14)
can be a flexible support member (s) after impact. 16) Repel more quickly than possible, which
allows the signal from the contact microphone to be returned quickly.
[0038]
As shown in FIG. 2 and described above, the arrangement for coupling the drive leg (20) and the
microphone (18) unloads the contact microphone (18) and returns quickly to neutrality. to
enable.
This is achieved by the flexible member (16) rebounding rapidly to lift the drive leg 20, allowing
the contact microphone (18) to return its signal quickly.
[0039]
The flexible member (16) provides sufficient rigidity while at the same time providing a damping
effect to the microphone (18). This arrangement allows the microphone (18) to move freely or
float vertically with a controlled degree of resistance while suppressing or preventing
longitudinal or lateral movement.
[0040]
Electrical leads (42) electrically connect the output signal from the microphone (18) to a stereo
or mono jack (44) for an amplifier or other device.
[0041]
The drum described herein can have the feel, sound and appearance of an acoustic drum while
having the advantages of an electronic drum, eliminating the need for a microphone for playing
or recording, and for volume and tonality. Make it easy to adjust.
[0042]
Unlike a conventional drum pickup microphone rigidly attached to the drum shell, the contact
04-05-2019
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microphone (18) is not directly supported by the drum shell (12), but instead is a resilient batter
head ( 14) compressed or supported between the bottom head (28) and
This arrangement causes the so-called "stacking" problem associated with contact microphones,
such as piezoelectric microphones, where the pressure from a series of strikes can cause a
storage effect that generates a signal that does not indicate an actual strike on the batter head.
To prevent.
By compressing the contact microphone (18) between the heads (14) and (18) acting as spring
microphones, the batter head will move towards the drum axis when struck and between
multiple impacts Quickly return to the original resting position and quickly restore the signal to
avoid accumulated effects.
[0043]
In current designs, there is no way to imply a return effect on the contact microphone. A flexible
support member (16) is fixed to the drum shell (12) by the bottom drum head, the flexible
support member (16) being a compressible and resilient spring. The upper drum head has much
less mass than the assembly below, has less resistance to pressure, has more movement, and
rebounds faster after compression, relieving pressure from the sound transmitting structure. This
reduces the pressure exerted by the legs (20) on the contact microphone, which causes the signal
to return quickly, allowing the flexible support (16) to initiate a rebound. We show the degree of
back and forth control to quickly damp and control unwanted movements while the contact
microphone is excited to remove the vibrations that produce the microphone effect. The key
factors to accomplish this function are the springs and masses on each side of the contact
microphone.
[0044]
While the present invention is described herein with reference to the illustrated embodiments, it
should be understood that the present invention is not limited thereto. Those skilled in the art
will recognize additional modifications and embodiments within the scope by accessing the
teachings of the present specification. Accordingly, the present invention is limited only by the
appended claims.
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