JP3803187B2 - Electric drum - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric drum suitable for playing on a stage, for example.
[0002]
[Prior art]
Conventionally, as a method of loudening the sound of a drum on a stage, a microphone is installed near the hitting surface of an ordinary drum (hereinafter referred to as an acoustic drum), and the sound of the drum is collected and the sound is amplified by a loudspeaker. A method has been adopted in which the sound is amplified and emitted, and the drum sound is sufficiently heard by the audience even in large halls.
[0003]
[Problems to be Solved by the Invention]
The conventional drum sounding method uses a microphone to collect the sound of the acoustic drum as sound via air vibrations, and the sound signal is amplified and emitted by a sounding device. The surrounding noise is also collected, and not only the target drum sound but also the sounds of other drums in the drum set are picked up. It is not possible to separate and collect only the desired drum sound). In addition, when the volume of the loud sound is increased, the loud sound is picked up by the microphone and causes a howling.
[0004]
In addition, when an experiment was conducted to pick up the vibration of the drum head (skin) by installing a vibration pickup using a piezoelectric element or the like on the drum body, the sound could not be picked up well. Conventionally, the material of the head is made of a low-elasticity soft polyethylene terephthalate (PET) film, and the loss of vibration is large inside the material of the head, and the vibration transmitted to the cylinder is small. For this reason, when hitting a place far from the vibration pickup of the head, the sound level becomes extremely (extremely) small, and in particular, the central portion of the head has become the smallest. On the contrary, the acoustic drum is extremely unnatural because it produces the highest volume when it hits the center of the head (the center of the head sounds well).
[0005]
There is also an electronic drum that converts the vibration of hitting the pad into an electrical signal, activates the sound source circuit using this electrical signal as a trigger signal, and generates a drum signal from the sound source circuit. Since the sound is determined uniformly by the circuit, there is a drawback that it lacks expressiveness compared to an acoustic drum.
An object of the present invention is to provide an electric drum having a performance feeling and performance expression equivalent to those of an acoustic drum.
[0006]
[Means for Solving the Problems]
In the present invention, a mesh-like body knitted with a wire mesh or a hard wire material is used as a head, and a structure of a mesh-like drum head that itself does not produce sound is produced. Since the structure is such that the drum head vibration is detected as it is and the drum head vibration is directly used as a sound source to generate an electrical signal corresponding to the sound of the drum, the wire mesh or the hard wire that is the material of the mesh drum head Due to its high rigidity, the loss of vibration transmitted through the material is small, and the struck vibration is quickly transmitted to the whole and is knitted into a net-like body. Vibrate.
[0007]
Therefore, according to the electric drum of the present invention, when the hitting state of the head is changed by the stick, the sound also changes accordingly, and a performance feeling close to that of the acoustic drum is obtained as if it was mistaken for hitting the acoustic drum. be able to. In addition, since the sound changes depending on how it is hit, there is an advantage that a performance expression equivalent to that of an acoustic drum can be obtained.
[0008]
Furthermore, according to the present invention, the structure is such that the vibration of the mesh drum head is converted into an electric signal by the vibration pickup and the musical sound is generated by the electric signal, so that the loud sound is not picked up directly. Therefore, even if the performance is increased at a large hall or the like, howling is not generated, and there is an advantage that a stable performance can be performed.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows an embodiment of the present invention. In the figure, 100 is an electric drum according to the present invention, and 200 is a loudspeaker. That is, the loudspeaker 200 amplifies the electric drum signal DS output from the electric drum 100 according to the present invention by the amplifier 201, drives the speaker 202 by the amplified output, and emits the drum sound from the speaker 202.
[0010]
The basic configuration of the electric drum 100 according to the present invention includes a cylindrical drum 101, a mesh drum head 102 stretched on one end face of the drum 101, and tension means 103 that applies tension to the mesh drum head 102. And a vibration pickup 104 mounted on the body 101, and a connector 105 that outputs an electric signal from the electric drum 100 to the loudspeaker 200.
[0011]
The cylinder 101 can be made of a material such as wood, metal, or plastic, and the drum of an acoustic drum can be used as it is. The characteristic features of the present invention are that the drum head is a mesh drum head 102 and that the vibration of the mesh drum head 102 is electrically extracted by a vibration pickup 104.
[0012]
The material of the mesh drum head 102 is preferably a mesh composed of a wire material that is harder and more elastic than polyethylene terephthalate, which is the material of the head of the acoustic drum. For example, stainless steel wire, nickel wire, piano wire, etc., which have high steel properties among wire meshes, can be used. Further, other than the wire mesh, for example, a net-like material knitted with a wire material having a high steel property such as carbon fiber may be used.
[0013]
As in the case of an acoustic drum, the mesh drum head 102 is provided with an appropriate tension by a tension means 103 composed of a hoop 103A, a frame 103B, and a tension bolt 103C that clamps between the hoop 103A and the frame 103B disposed on the upper end side and the lower end side of the drum 101. Given, it is stretched to one open end face of the barrel 101.
The vibration pickup 104 can be a vibration pickup such as a piezoelectric element or an electromagnetic conversion element. In the case of a piezoelectric element, the vibration pickup 104 is directly mounted on the inner wall of the drum 101 or the joint surface between the mesh drum head 102 and the drum 101. Then, the vibration of the mesh drum head 102 is detected and output from the connector 105 as an electrical signal.
[0014]
When an electromagnetic transducer is used, the mesh drum head 102 is formed of a ferromagnetic metal mesh, and a vibration pickup 104 composed of an electromagnetic transducer is attached to face the vibration surface of the mesh drum head 102.
When the electric drum 100 configured as described above is struck by the stick 300, the mesh drum head 102 vibrates, and when the vibration pickup 104 is a piezoelectric element, the vibration is transmitted to the vibration pickup 104 via the body 101. The vibration is converted into an electric drum signal DS, the electric drum signal DS is output from the connector 105, and is emitted as sound by the loudspeaker 200.
[0015]
When the vibration pickup 104 is an electromagnetic transducer, a magnetic change is applied to the vibration pickup 104 by the vibration of the mesh drum head 102, and the vibration of the mesh drum head 102 is converted into an electric drum signal DS by the magnetic change and output from the connector 105. .
In this configuration, when a wire mesh composed of mesh # 30 (the number of eyes in 1 inch) is used as the mesh drum head 102 by a stainless steel wire having a diameter of 0.22 mmφ on a cylinder having a diameter of 10 inches, A natural (drum-like) tone that includes low to high frequencies was obtained. Moreover, a wide range of pitches was obtained from bass drum to snare drum when the tension was changed.
[0016]
On the other hand, when a wire mesh composed of a mesh # 50 made of stainless steel wire with a wire diameter of 0.14 mmφ is used as the mesh drum head 102, a thin drum in terms of an acoustic drum with many specific high-frequency overtones and low low-frequency. A drum with a head, a so-called tambourine tone, was obtained.
Next, when a wire mesh composed of mesh # 16 with a stainless steel wire having a wire diameter of 0.29 mmφ was used as the mesh drum head 102, a tone like a metal percussion containing a lot of metallic overtones was obtained. It was.
[0017]
For example, when a metal wire coated with a hard resin is used as the material of the net, a tone color with reduced metallic overtones can be obtained. Moreover, the same effect was acquired even if resin was coated to the wire mesh.
As described above, the tone color can be changed by subjecting the material of the mesh drum head 102 and the mesh to surface processing, or changing the diameter of the wire constituting the mesh and the mesh # of the mesh.
[0018]
From the above, the basic configuration of the electric drum according to the present invention can be understood. 2 to 20 show the configuration of each part of the electric drum according to the present invention and its modified embodiments. 2 to 12 show an embodiment in which the vibration pickup 104 is a piezoelectric element, and FIGS. 13 to 16 show an embodiment in which the vibration pickup 104 is an electromagnetic transducer.
FIG. 2 shows a case where the vibration pickup 104 is attached to the upper end of the cylinder 101, that is, the joining surface between the mesh drum head 102 and the cylinder 101. The body 101 can be made of wood, reinforced plastic or metal. In this embodiment, a notch 106 is formed at the upper end of the barrel 101 as shown in FIG. 2, and a vibration pickup 104 made of a piezoelectric element is accommodated in the notch 106, and a vibration receiving piece 107 is placed on the notch 106. A case in which the vibration of the mesh drum head 102 is transmitted to the vibration pickup 104 via the receiving piece 107 is shown.
[0019]
A detailed structure of the vibration pickup 104 is shown in FIG. In this example, the vibration pickup is constituted by a piezoelectric element 104A and common electrode 104B and electrode 104C mounted on the upper and lower sides thereof. The vibration receiving piece 107 can be formed of the same wood, reinforced plastic or metal as the body 101, and the tone color can be set according to the material. By the way, when it is made of wooden or reinforced plastic, it becomes a sound with emphasized low range, and when it is made of metal, it becomes a sound with emphasized high range.
[0020]
Among these, the metal is particularly effective when the vibration pickup 104 can be shielded electrically and mixing of noise and the like can be prevented.
The embodiment shown in FIG. 2 shows a case where notches 106 are formed at three positions at 120 ° angle intervals on the upper end of the cylinder 101 and the vibration pickup 104 is attached to each notch 106. Therefore, as shown in FIG. 4, the three vibration pickups 104 attached to each notch 106 can be connected in parallel, and the parallel connection point can be led out to the outside through the connector 105.
[0021]
By providing the plurality of vibration pickups 104 at equal intervals in this way, the sound intensity does not occur depending on the hit position, and a uniform volume can be obtained. Further, since a plurality of vibration pickups 104 are connected in parallel, even when the vicinity of a specific vibration pickup 104 is hit with a stick 300, a detection signal having a large amplitude is attenuated because other vibration pickups act as a load. Are output from the connector 105 at the same level.
[0022]
In FIG. 2, the tension means 103 is constituted by the hoop 103A, the frame 103B, and the tension bolt 103C as described above. The tension bolt 103C is passed between the hoop 103A and the frame 103B, and the hoop 103A and the frame 103B. By applying a tightening force therebetween, the hoop 103 </ b> A suppresses the ring 102 </ b> A attached to the periphery of the mesh drum head 102 and applies tension to the mesh drum head 102. The frame 103B is integrally formed with a holding fitting 103D for supporting the entire drum on a column (not shown). In the example shown in FIG. 2, the case where the body 101 and the frame 103B are formed separately is shown, but these may be formed integrally.
[0023]
5 and 6 show another example of the mounting structure of the vibration pickup 104. FIG. In this example, the case where the body 101 is divided into two parts, an upper half part 101A and a lower half part 101B, and the vibration pickup 104 is attached to the joint part is shown. Therefore, in this embodiment, the upper half 101A of the body 101 functions as a vibration receiving ring.
7 and 8 show still another example of the mounting structure of the vibration pickup 104. FIG. In this example, a notch is formed at the upper end of the barrel 101, the vibration pickup 104 is housed inside the notch, and a pickup cover 108 is placed thereon. The pickup cover 108 is fixed to the body 101 with an adhesive, for example, to protect the vibration pickup 104, and the pickup cover 108 is formed with a through hole 108A that leads from the upper surface to the mounting portion of the vibration pickup 104, and the vibration is generated in the through hole 108A. A case where a receiving piece 107 is inserted and the vibration of the mesh drum head 102 is transmitted to the vibration pickup 104 through the vibration receiving piece 107 is shown.
[0024]
In this case, the vibration receiving piece 107 is inserted so as to be freely movable in the through hole 108A, and is selected to protrude slightly upward from the upper surface of the through hole 108A, and is pressed against the vibration pickup 104 by the tension of the mesh drum head 102. Let As the material of the vibration receiving piece 107, zinc, aluminum die-cast, other metal, reinforced plastic, wood or the like can be used.
[0025]
By selecting the material of the vibration receiving piece 107, the timbre can be changed. For example, when a hard material such as metal or hard plastic is used, a high tone is emphasized, and when a soft reinforced plastic such as nylon is used, a high frequency component is reduced and a mid range is emphasized. When hard and light wood such as ebony or hard maple is used, the tone is emphasized in the low range.
[0026]
7 and 8 show only one vibration pickup 104, a plurality of vibration pickups 104 are provided as shown in FIGS. Also in this embodiment, the pickup cover 108 is made of metal, and the pickup pickup 108 can be shielded by the pickup cover 108 by contacting the pickup cover 108 with the electrode 104B on the common potential side of the pickup pickup 104. Therefore, according to the embodiment shown in FIGS. 7 and 8, the shield effect can be obtained as compared with the embodiments shown in FIGS. be able to.
[0027]
9 to 12 show still another embodiment of the installation structure of the vibration pickup 104. FIG. In this embodiment, the case where the vibration pickup 104 is attached to the inner wall surface of the barrel 101 is shown. The embodiment shown in FIGS. 9 and 10 shows a case where the body 101 is formed of a thick material. As the material, wooden or aluminum die-cast, reinforced plastic, or the like can be used, and the tone color can be selected depending on these materials. For example, when ABS foam resin is used, a soft tone with reduced high frequencies is produced, and when birch (wood) is used, a thick and round tone with emphasized mid and low frequencies. become.
[0028]
A flat surface 111 is formed on the inner wall surface of the body 101, and the vibration pickup 104 is attached to the flat surface 111.
The embodiment shown in FIGS. 11 and 12 shows a case where the body 101 is formed of an iron plate having a thickness of about 1 to 2 mm. When the iron plate is used in this way, the rising of the sound in which the high frequency component is emphasized becomes a sharp, hard tone.
[0029]
FIGS. 13 and 16 show an embodiment in which an electromagnetic transducer is used as the vibration pickup 104. FIG. The electromagnetic conversion element is constituted by a coil 104D and a permanent magnet 104E attached to the axis of the coil 104D. The vibration pickup 104 constituted by the coil 104D and the permanent magnet 104E is a pickup holder 112 in the examples of FIGS. The case where it mounts | wears with the inner wall surface of the trunk | drum 101 is shown. 13 and 14, only one vibration pickup 104 is shown. However, three, for example, 120 ° angular intervals are provided on the inner wall of the body 101, and three vibration pickups 104 are connected in parallel to each other (FIGS. 13 and 14). 14 can output the electric drum signal. When the vibration pickup 104 constituted by an electromagnetic transducer is used, the mesh drum head 102 is a wire mesh having magnetism. When the mesh drum head 102 vibrates, the magnetic flux passing through the coil 104D changes, and the change in the magnetic flux causes the coil 104D to change. Inductive electromotive force is generated in this, and this induced electromotive force is output as an electric drum signal.
[0030]
15 and 16 show a case where the vibration pickup 104 constituted by an electromagnetic conversion element is arranged in the central portion of the body 101. FIG. When the mesh drum 101 is arranged in the central portion of the body 101 in this way, the mesh drum head 102 vibrates most in the middle portion. Therefore, when the mesh drum head 102 is struck strongly, the mesh drum head 102 contacts the vibration pickup 104, Noise may be generated.
[0031]
For this reason, this embodiment shows a case where the position of the vibration pickup 104 is moved in the vertical direction and a configuration in which the interval G between the mesh drum head 102 and the vibration pickup 104 can be arbitrarily adjusted is added. For this purpose, a cylindrical boss 114 projecting in the axial direction is projected from a bobbin 113 that integrally supports the coil 104D and the permanent magnet 104E, and a female screw is formed on the inner wall of the hollow hole of the boss 114. The adjustment screw 115 is screwed into this female screw, and the adjustment screw 115 is rotated, whereby the vibration pickup 104 is moved up and down, and the distance G between the mesh drum head 102 can be adjusted. The vibration pickup 104 is configured to apply an elastic biasing force upward by a spring 116 so that the set position by the adjusting screw 115 is stably maintained.
[0032]
As shown in FIGS. 15 and 16, by placing the vibration pickup 104 at the center position of the body 101, a drum sound with a large volume can be obtained by hitting the center, and the volume gradually decreases as the distance from the center portion increases. The characteristic to do is obtained. This characteristic provides a performance feeling similar to that of an acoustic drum. Further, since the position of the vibration pickup 104 can be arbitrarily set, the distance G corresponds to the amplitude of the drum head central portion due to the difference in tension adjustment of the mesh drum head 102 and the average value of the player's tapping force. It is also possible to prevent the mesh drum head 102 from coming into contact with the vibration pickup 104 during vibration and generating noise.
[0033]
FIG. 17 shows an example in which the vibration pickups 104 of the respective types described so far are combined. That is, in FIG. 17, 104AA is the vibration pickup supported by the support structure of the vibration pickup 104 shown in FIG. 2, 104BB is the vibration pickup of the support structure shown in FIGS. 9 to 12, and 104CC is shown in FIGS. A vibration pickup constituted by an electromagnetic transducer is shown. The electric detection signals of the vibration pickups 104AA, 104BB, 104CC of each support structure are introduced into the mixer device 118, and the mixing ratio of the electric outputs of the vibration pickups 104AA, 104BB, 104CC is set by the mixer device 118. The case where the electric drum signal mixed by the mixing ratio is output through the connector 105 is shown. The mixer device is provided with knobs 118A, 118B, and 118C for adjusting the output level of the electric signal for each of the vibration pickups 104AA, 104BB, and 104CC. The knobs 118A, 118B, and 118C are appropriately set to adjust the mixing ratio. The case where it can be set freely is shown.
[0034]
In the embodiment of FIG. 17, the vibration pickup 104CC constituted by the electromagnetic conversion element is mixed, and the vibration pickup 104CC constituted by the electromagnetic conversion element has a different impedance from the vibration pickup constituted by the piezoelectric element. Cannot be connected in parallel. Therefore, as shown in FIG. 18, the output signals of the vibration pickups 104AA, 104BB, and 104CC are amplified by the buffer amplifiers BU1, BU2, and BU3 provided in the mixer device 118, are analog-added by the analog adder circuit ADD, and the addition is performed. A result is output through the connector 105, and the case where it is set as the structure which emits an electric drum sound from the loud speaker 200 is shown.
[0035]
In this case, an advantage that the tone color can be changed by changing the mixing ratio of the vibration pickups 104AA, 104BB, 104CC in the mixer device 118 is obtained.
19 and 20 show an embodiment in which a flexible film-like body 119 is attached to a part of the mesh drum head 102 in order to arbitrarily set a timbre. FIG. 19 shows a case where a circular film-like body 119 is attached to the central portion of the mesh drum head 102. FIG. 20 shows a case where a ring-shaped film-like body 119 is attached. As shown in FIG. 19, when the film-like body 119 is attached to the central portion of the mesh drum head 102, the timbre is emphasized in the low range, and in the case of FIG. 20, the timbre is emphasized in the mid range. As the material of the film-like body 119, a flexible polymer material or the like can be used. In addition, when a material having high hardness such as polyethylene terephthalate is used as the film-like body 119, a drum sound with a sharp rise in sound and a so-called attack can be obtained.
[0036]
From the above, the structure of the electric drum according to the present invention can be understood. According to each of the above-described embodiments, when the mesh drum head 102 is hit, the vibration is detected by the vibration pickup 104 and output as an electric drum signal to be supplied to the loudspeaker 200 to emit the drum sound. Even with this configuration, a drum sound with sufficiently good tone can be obtained. However, the timbre can be made closer to the sound of an acoustic drum by providing the timbre improvement electronic circuit described below.
[0037]
FIG. 21 and subsequent figures show an embodiment of a loudspeaker device 200 to which various circuits for further bringing the sound of an electric drum according to the present invention closer to an acoustic drum are added.
In FIG. 21, a buffer amplifier 203 and a timbre improvement electronic circuit 204 are cascaded and arranged on the upstream side of the amplifier 201 constituting the loudspeaker 200, and an adder 205 is provided to improve the timbre by the timbre improvement electronic circuit 204. The case where the original sound DS is added to the signal DDS, the addition result is amplified by the amplifier 201, and the speaker 202 is driven by the amplified output to emit sound as sound from the speaker 202 is shown.
[0038]
FIG. 22 shows an example of the timbre improvement electronic circuit 204. NL indicates a harmonic overtone generating circuit constituted by a non-linear circuit. A harmonic component is generated from the electric drum signal DS inputted from the electric drum 100 by the harmonic generation circuit NL, and this harmonic component is taken out through, for example, a band pass filter FL and added to the original sound DS by the analog adder 205, whereby the original sound is extracted. A signal having a tone color more like a drum can be obtained by adding a harmonic component to the electric drum signal DS.
[0039]
As a specific example of the overtone generating circuit NL, the simplest example can be constituted by a double-wave rectifier circuit or a single-wave rectifier circuit. It is also conceivable to generate a harmonic component by converting the signal of each cycle of the electric drum signal DS into a rectangular wave by an amplifier having a nonlinear input / output characteristic or a saturation amplifier.
As another example, the harmonic generation circuit NL can be configured by a multiplier as shown in FIG. According to this overtone generation circuit NL, the original sound DS (FIG. 24A) is multiplied together, a signal waveform (FIG. 24B) with a high distortion rate is generated as a result of the multiplication, and a harmonic overtone component is generated with this high waveform distortion signal. Can do.
[0040]
Other examples of the overtone generation circuit NL are shown in FIGS. FIG. 25 shows a case where the harmonic overtone generation circuit NL is configured by a variable delay circuit. In this case, the electric drum signal DS is supplied to the variable delay circuit, and the delay time of the variable delay circuit is made to correspond to the level of the electric drum signal DS to modulate the delay time, thereby modulating the signal on the output side of the analog adder 205. And the original sound DS are added, resulting in an increase in overtone components. As the variable delay circuit, a variable delay circuit can be configured by using a bucket brickade (charge transfer element) called BBD. Further, it may be performed digitally using an A / D converter, a D / A converter, a shift register, or the like.
[0041]
FIG. 26 shows a case where the overtone generation circuit NL is configured by a phase shifter. Even when a phase shifter is used, the electric drum signal is phase-shifted according to the level of the electric drum signal, and the analog adder 205 adds the signal that has undergone phase transition and the signal that has not undergone phase transition, thereby adding harmonics. Ingredients are doubled.
In FIG. 27, a noise generator NG is provided in addition to the tone color improvement circuit 204. White noise generated from the noise generator NG is extracted only at the rising edge of the electric drum signal, for example. A case is shown in which a high frequency component is included in the rise of the sound of the electric drum by adding to the component to improve the attack sound.
[0042]
For this purpose, a desired frequency component (audible frequency component) is extracted from the white noise generated by the noise generator NG, for example, by the band pass filter BFL, and the audible noise component is input to the multiplier JO. The multiplier JO multiplies the audible noise component by the harmonic component generated by the harmonic generator, and extracts only the rising edge of the electric drum signal. The audible noise component thus extracted is further added to the bandpass filter BFL2 as necessary. Are input to the analog adder 205. The analog adder 205 receives the electric drum signal DS and the harmonic component generated by the harmonic generator NL, and adds them together with the audible noise to the original sound DS.
[0043]
Accordingly, with this configuration, audible noise is added to the rising portion (attack portion) of the sound of the electric drum signal, so that the rising sound is brought closer to the acoustic drum.
In FIG. 27, as the filters FL1 and FL2 provided in the timbre improvement electronic circuit 204, either a band-pass filter or a low-pass filter is used, and an overtone component of an audible frequency is passed.
[0044]
【The invention's effect】
As described above, according to the present invention, since the drum head is the mesh drum head 102 made of a metal wire or a wire having a high hardness, the mesh drum head 102 vibrates without being subjected to a braking action by air. Can do. Therefore, vibration with a long reverberation (long sustain) can be obtained. Further, since the reticulated drum head 102 is rigid (steel) in itself, vibration with a long reverberation can be obtained even if the tension by the tension means 103 is low. That is, even with a net-like drum head 102 stretched with a low tension on the drum 101 having a small diameter, a drum sound having a low pitch and a long sustain can be obtained. Therefore, there is an advantage that a large-diameter drum sound can be generated even though the drum has a small diameter. That is, a drum sound with a long sustain can be obtained even with the mesh drum head 102 stretched on the drum 101 having a small diameter. Therefore, there is an advantage that a large-diameter drum sound can be generated even though the drum has a small diameter.
[0045]
Furthermore, since the vibration of the mesh drum head 102 is converted into an electric signal by the vibration pickup 104 and this electric signal is input to the loudspeaker 200 as the electric drum signal DS, the vibration of the mesh drum head 102 itself is converted into an electric signal. Since the sound is converted and emitted as a drum sound, depending on how the reticulated drum head 102 is struck, the vibration of the reticulated drum head 102 can be freely changed (depending on the performance technique) to express the change in vibration as a change in sound. can do. As a result, the performance can be performed without any difference from the playing method of the acoustic drum.
[0046]
Further, by adding the timbre improving electronic circuit 204 or the noise generator NG to the loudspeaker 200, there is also an advantage that the timbre of the electric drum sound emitted from the speaker 202 can be made closer to the timbre of the acoustic drum. .
[Brief description of the drawings]
FIG. 1 is a connection layout diagram for explaining a basic configuration of the present invention.
FIG. 2 is an exploded perspective view for explaining an embodiment of the electric drum according to the present invention.
3 is a cross-sectional view for explaining the structure of the main part of the embodiment shown in FIG. 2;
4 is a connection diagram for explaining the electrical connection structure of the embodiment shown in FIG. 2;
FIG. 5 is a cross-sectional view for explaining another embodiment of the main part of the electric drum according to the present invention.
6 is an exploded perspective view for explaining the entire implementation structure shown in FIG. 5;
FIG. 7 is a sectional view for explaining another embodiment of the main part of the electric drum according to the present invention.
8 is a perspective view for explaining details of the implementation structure of FIG. 7; FIG.
FIG. 9 is a cross-sectional view for explaining another embodiment of the main part of the electric drum according to the present invention.
10 is an exploded perspective view for explaining the entire implementation structure shown in FIG. 9;
FIG. 11 is a cross-sectional view for explaining another embodiment of the main part of the electric drum according to the present invention.
12 is an exploded perspective view for explaining the entire implementation structure shown in FIG. 11;
FIG. 13 is a cross-sectional view for explaining another embodiment of the main part of the electric drum according to the present invention.
14 is a perspective view for explaining details of the implementation structure shown in FIG. 13; FIG.
FIG. 15 is a cross-sectional view for explaining another embodiment of the main part of the electric drum according to the present invention.
FIG. 16 is a perspective view for explaining the entire implementation structure shown in FIG. 15;
FIG. 17 is an exploded perspective view for explaining another example of the main part of the electric drum according to the present invention.
18 is a connection diagram for explaining an electric circuit of the implementation structure shown in FIG. 17;
FIG. 19 is a perspective view for explaining a state in which the tone color adjusting means of the electric drum according to the present invention is applied.
20 is a perspective view similar to FIG.
FIG. 21 is a connection diagram for explaining an example of a loudspeaker for an electric drum according to the present invention.
22 is a connection diagram specifically showing a main part of the loudspeaker for the electric drum shown in FIG. 21. FIG.
23 is a connection diagram similar to FIG.
24 is a waveform diagram for explaining the operation of FIG.
25 is a connection diagram similar to FIG.
FIG. 26 is a connection diagram similar to FIG.
FIG. 27 is a connection diagram similar to FIG.

Claims (5)

A. A cylindrical body;
B. A net-like drum head composed of a wire that is stretched on one opening surface of the cylinder and has a hardness higher than that of polyethylene terephthalate;
C. Tensioning means for applying tension to the mesh drum head;
D. A vibration pickup of a piezoelectric transducer that is attached to a joining end surface of the drum with the mesh drum head and converts the vibration of the mesh drum head into an electric signal;
E. An electrical connector for taking out an electrical signal obtained by the vibration pickup from the inside of the body to the outside;
An electric drum comprising: A. A cylindrical body;
B. A net-like drum head composed of a wire that is stretched on one opening surface of the cylinder and has a hardness higher than that of polyethylene terephthalate;
C. Tensioning means for applying tension to the mesh drum head;
D. A structure in which the body can be divided in the axial direction, a vibration pickup of a piezoelectric transducer that is attached to the divided joint surface and converts vibration of the mesh drum head into an electric signal;
E. An electrical connector for taking out an electrical signal obtained by the vibration pickup from the inside of the body to the outside;
An electric drum comprising: In electric drum according to claim 1 or 2, wherein said vibration sensor was mounted multiple, electric drum, characterized in that the detection signals of the plurality of vibration pickups has a configuration which an analog addition removed from the electrical connector. In any of the electric drum of claims 1 to 3, wherein, by attaching a film-like body having a flexible part of the mesh drum head, electric drum, characterized in that to adjust the tone. In any of the electric drum of claims 1 to 3, wherein, by attaching a high film-like material hardness in a part of the mesh drum head, electric drum, characterized in that to adjust the tone.

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