JPS5939753Y2 - electric percussion instruments - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electric percussion instrument in which the vibration of the diaphragm is detected by a pickup provided between two diaphragms.

Because electric percussion instruments such as drums have a high volume, it is difficult to balance the volume when playing in ensemble with instruments that can freely adjust the volume, such as electric pianos and electric guitars.

To solve this problem, we installed a mute body that presses against the drum head to dampen its vibrations.
The same inventor is considering an electric percussion instrument in which a pickup is built into the mute body and the vibration of the drum head is detected by this pickup (
Utility Application No. 53-29083, Utility Application No. 133836, 1972
(see publication).

According to such electric percussion instruments, it is possible to significantly weaken the raw sound, and it is also possible to obtain a good electric sound with less noise without picking up the air vibration as a vibration transmission medium or the transmitted vibration of the body. The drawback was that the supporting structure of the main body was complicated and the cost was higher than conventional electric percussion instruments.

This idea was made in consideration of the above points, and its purpose is to reduce raw sound with a simple structure, and to easily adapt it to normal percussion instruments by simply replacing the head. Our goal is to provide such electric percussion instruments.

In order to achieve this objective in a distant manner, this invention is such that a cushioning material and a pickup are disposed between two vibrating membranes whose peripheries are in close contact with each other.

This invention will be explained in detail below based on the drawings.

FIG. 1 is a longitudinal sectional view of an embodiment of an electric percussion instrument according to this invention.

In the figure, an upper head 1 and a lower head 2 as the vibrating membrane of the drum are made of circular synthetic resin sheets, and a cushioning material 3 made of polyurethane resin foam sponge or the like is placed between the upper head 1 and the lower head 2. In addition, inside this cushion material 3 are an upper head 1 and a lower head 2.
A pickup 4 consisting of a piezoelectric element is located approximately at the center of the
is placed in a mold.

A shield wire 5 drawn out from the pickup 4 passes through the lower head 2 and extends downward.

The outer peripheries of the upper head 1 and the lower head 2 are stacked and assembled into a ring-shaped frame 6 made of synthetic resin and fixed.

As a result, the outer peripheries of the upper head 1 and the lower head 2 are brought into close contact with each other, and the cushion material 3 having the pickup 4 molded in the center thereof is housed between the upper head 1 and the lower head 2 in a sealed space.

Such a head assembly is placed in the opening of the drum body 7.

A tightening frame 8 formed in a ring shape on the peripheral frame body 6
The tightening bolt 9 passing through the tightening frame 8 is screwed into the lug 10 fixed to the outer surface of the body 7, and the tightening frame 8 is pushed downward.

As a result, the frame body 6 is pulled downward along the outer periphery of the body 7,
The upper head 1 and lower head 2 of the head assembly are stretched over the opening of the body 7.

In such a configuration, when the upper head 1 is hit with a stick, the vibration of the upper head 1 is transmitted to the lower head 2 via the cushioning material 3, and at the same time, the pickup 4 embedded in the cushioning material 3 detects this vibration. An electrical signal corresponding to the vibration is output from the shielded wire 5.

This electrical signal is processed by an electrical circuit as will be described later, and then produced by a speaker.

The vibrations of the upper head 1 and the lower head 2 are greatly attenuated because the cushioning material 3 is interposed between them, and the volume of so-called live sound becomes small.

Therefore, although the vibrations detected by the pickup 4 are smaller in amplitude than when the cushion material 3 is not used, the performance sound is not substantially lowered because the vibrations are converted into electrical signals and can be amplified to any desired volume.

FIG. 2 is a block circuit diagram of an electric circuit that processes electric signals output from the pickup 4.

In the figure, an electrical signal from a pickup 4 is input to a sample and halting circuit 11 and a gate circuit 12 in parallel.

The sample and hold circuit 11 samples and stores the intensity of the electrical signal, and its output is supplied to a voltage controlled amplifier (VCA) 13 as a control voltage signal.

The gate circuit 12 uses an electric signal to generate a trigger signal indicating that the drum has been hit, and this signal causes the envelope generator 14 to generate an envelope signal.

Generally, sounds played like percussion instruments have a long decay time and a short sustain time.

The envelope generator 14 generates an envelope signal with a waveform corresponding to the drum, and this signal is supplied to the voltage-controlled amplifier 13 as a control voltage signal.

This voltage controlled amplifier 13 is a voltage controlled oscillator (VC
O) 15, a voltage controlled filter (VCF) 16 and a speaker 17 constitute a synthesizer circuit.

The voltage-controlled amplifier 13 is always supplied with a drum sound source signal, and each time an electric signal is output from the pickup 4, the sound source signal is controlled according to its strength and a predetermined envelope, and the sound source signal is output from the speaker 17 to the drum system. A musical tone is pronounced.

In this embodiment, the electrical signal output from the pickup 4 is used only as a control signal, and a low-level electronic sound is used as the sound source signal. Of course, it is also possible to pronounce it as

The electric percussion instrument of this invention can be applied not only to drums but also to various other percussion instruments such as bongos and congas.

. As described above, according to the electric percussion instrument of this invention, the head of a conventional percussion instrument can be removed and the head consisting of two vibrating membranes sandwiching the pickup and cushioning material of this invention can be attached thereto. can be easily converted into an electric percussion instrument.

Moreover, since the structure is simple, costs are reduced and handling becomes easy.

In addition, since the volume of the live sound is low, the volume of the electric signal can be freely adjusted with a knob to balance the volume with other instruments in the ensemble.

Furthermore, if you reduce the volume of the electrical signal, you can practice without raising the volume, which is also effective in terms of the acoustic environment.

Furthermore, since the pickup is surrounded by a cushioning material, unnecessary transmitted vibrations are blocked and only pure vibrations of the head are detected, resulting in noise-free sound.

As described above, this invention has many excellent effects.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an embodiment of an electric percussion instrument according to this invention, and FIG. 2 is a block circuit diagram of its electric circuit. 1... Upper head (vibrating membrane), 2... Lower head (vibrating membrane), 3... Cushioning material, 4...
...Pickup, 6...Frame, 7...
...Torso.

Claims (1)

[Scope of utility model registration request] An electric percussion instrument characterized in that the outer peripheries of two vibrating membranes are brought into close contact with each other, and a cushioning material and a pickup are arranged between the vibrating membranes and stretched over an opening of a body.