Moving-coil erhu pickup

Abstract

The utility model discloses a moving-coil Erhu sound pickup, which comprises a sound pickup body, the sound pickup body comprises a shell and an outer screw sleeve, a cross beam is welded at the outer end of the outer screw sleeve, an inner screw sleeve is arranged on the outer side wall of the shell, the inner screw sleeve and the outer screw sleeve are mounted in a matched and threaded manner, and the cross beam is welded at the outer end of the outer screw sleeve. The moving-coil Erhu pickup directly picks up vibration frequency and amplitude signals of the skin and directly converts the vibration frequency and amplitude signals into electric signals, signal distortion is small, the pickup is directly installed in the sound tube, the pickup mode is simplified, and the signal transmission mode can be line transmission and can also be transmitted through a wireless transmitter. The playing postures can be played at will according to stage requirements, standing type playing, marching type playing and playing while dancing are carried out at will, the embarrassing situation that a wireless microphone needs to be hung on a belt on the waist or bound on an Erhu cylinder in the prior art is solved, a player must carefully fly, and sound transmission is interrupted once the microphone is touched, so that the player cannot play the wireless microphone at any time. The problem of howling during pickup of the microphone is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of electro-acousticization of a national musical instrument, the erhu, in particular to a dynamic coil erhu pickup. Background Art

[0002] The sound of the erhu, a national musical instrument, mainly relies on the vibration of the instrument skin. The player repeatedly pushes and pulls the bow, causing the horsetail fixed on the bow to rub against the strings, causing the strings to vibrate continuously. The vibration of the strings is transmitted to the instrument skin through the bridge, thereby driving the continuous vibration of the instrument skin. When the instrument skin vibrates, it pushes the air on both sides of the skin to compress and expand. The air waves with constantly changing density continue to spread to the distance, thus producing sound.

[0003] The main function of the sound box is to prevent low-frequency sound waves from short-circuiting, to make the sound more directional, and to amplify the volume of the erhu. When the skin vibrates, an extremely complex waveform will be generated in the sound box, including both fundamental waves and harmonics generated by the vibration of the skin. Therefore, it is difficult to capture the skin vibration waveform through a single-frequency instrument or device. For a long time, the sound of the erhu can only be captured by placing various microphones inside and outside the sound box. Although various types of electroacoustic erhu have appeared on the market, they are limited by the limitations of pickup technology, and electroacoustic pickup technology is difficult to satisfy people.

[0004] There are three commonly used pickup methods on the market:

[0005] (1) Various microphones are placed in front of and behind the sound box to pick up the sound of the erhu. This pickup technique has certain limitations. If the microphone is too close or too far from the sound box, the sound pickup effect will be affected. If it is too close, the sound distortion will be serious. If it is too far from the sound box, it will be easily disturbed by the background sound, resulting in unclean sound pickup. The biggest limitation of this pickup method is that the performer and the microphone must maintain a specific direction and a fixed distance, which limits the performer's range of movement and playing posture. For a long time, the erhu has been played only while sitting. The birth of wireless microphones has liberated the performer from playing while sitting, and the performer can play while dancing. However, wireless microphones can only be hung on the belt or tied to the sound box. The position between the microphone pickup head and the sound box is not ideal, which makes the picked-up sound distorted. The microphone is clamped outside the sound box or placed inside the sound box: This pickup technique causes serious signal distortion due to the interference of standing waves inside the sound box. Another biggest disadvantage of microphone pickup is the howling sound, especially when the microphone is close to the speaker or the microphone pickup head is aimed at the speaker, a high-frequency and harsh howling sound will suddenly occur.

[0006] (2) The sound of the erhu is picked up by placing a ceramic piezoelectric sensor between the bridge and the instrument skin. Since the mass of the ceramic piezoelectric sensor is attached to the instrument skin, the natural vibration frequency and amplitude of the instrument skin are changed, resulting in a decrease in the amplitude of the instrument skin and attenuation of the high-frequency signal, which reduces the volume of the erhu and narrows the frequency bandwidth. The loss of high-frequency signals makes the sound dull and loses the unique charm of the erhu. The electroacoustic sound after pickup is more seriously distorted than the original sound.

[0007] (3) By borrowing the sound pickup technology of electric guitars, a magnetic induction coil is installed near the strings to pick up the vibration signal of the strings; the sound of the erhu picked up by this technical means is too different from the original sound of the erhu, and it has a horse-head fiddle sound. Because the vibration frequency of the strings is detected, it has little to do with the vibration of the skin, so there is also an erhu without a skin.

[0008] It is necessary to preserve the sound characteristics of the erhu, a traditional national musical instrument, while ensuring that the sound signal of the erhu is not distorted after being picked up. How to provide a high-fidelity erhu pickup has become a bottleneck problem in the electro-acousticization of the erhu.

[0009] Therefore, we propose a dynamic erhu pickup to solve the above problems. Utility Model Content

[0010] In view of the problems existing in the prior art, the utility model discloses a dynamic coil erhu pickup, and the technical solution adopted is that the pickup body includes an outer shell and an outer thread sleeve, the outer end of the outer thread sleeve is welded with a crossbeam, the outer side wall of the outer shell is provided with an inner thread sleeve, the inner thread sleeve and the outer thread sleeve are threadedly installed in cooperation, a magnetic cylinder is installed inside the outer shell, a magnet is installed inside the magnetic cylinder, a centering elastic wave support piece is provided inside the outer shell, a voice coil is inserted into the central circular hole of the centering elastic wave support piece, a coil is wound around the outside of the voice coil, a pressure ring is provided at the upper end of the centering elastic wave support piece, and the pressure ring is bonded and installed in cooperation with the outer shell.

[0011] As a preferred technical solution of the utility model, four protrusions are arranged on the outer side of the shell and the protrusions are fitted and snap-fitted with the grooves on the side of the inner thread sleeve.

[0012] As a preferred technical solution of the utility model, the voice coil and the piano skin are bonded and installed with adhesive, an audio output socket is installed at the other end of the piano body, and the electrical signal generated by the pickup body is connected to the external mixing console and pre-signal processor through the audio socket.

[0013] As a preferred technical solution of the present invention, the crossbeam is fixed to the inner wall of the sound box by bolts.

[0014] As a preferred technical solution of the utility model, the wire diameter of the coil is 0.03 mm and the width is 5 mm.

[0015] The beneficial effects of the utility model are as follows: the dynamic coil erhu pickup directly picks up the vibration frequency and amplitude signals of the instrument skin and directly converts them into electrical signals, with low signal distortion. At the same time, the pickup is directly installed in the instrument tube, which simplifies the sound pickup method. The signal transmission method can be transmitted through lines or through wireless transmitters. The playing posture can be freely performed according to the needs of the stage, and standing performance, marching performance, and dancing performance are free to play. This solves the embarrassing situation that the wireless microphone needs to be hung on the belt around the waist or tied to the erhu instrument tube. The performer must be careful. Once the microphone is touched, the sound transmission is interrupted, which solves the problem of howling when the microphone picks up sound. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a three-dimensional diagram of the utility model;

[0018] Figure 2 It is a cross-sectional view of the utility model;

[0019] Figure 3 This is an exploded view of the utility model;

[0020] Figure 4 This is a schematic diagram of the installation position of the utility model;

[0021] Figure 5 It is a schematic diagram of the working principle of the utility model.

[0022] In the figure: 1, pickup body, 101 pressure ring, 102 voice coil, 103 centering spring support plate, 104 coil, 105 magnet, 106 magnetic cylinder, 107 inner thread sleeve, 108 outer shell, 109 outer thread sleeve, 110 crossbeam, 2 sound box, 21 sound skin, 22 sound window, 23 audio output socket, 3 magnetic lines of force. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] Example 1

[0025] like Figures 1 to 5 As shown, the utility model discloses a dynamic coil erhu pickup, and the technical scheme adopted is that the pickup body 1 includes a shell 108 and an outer thread sleeve 109, the outer end of the outer thread sleeve 109 is welded with a crossbeam 110, the outer wall of the shell 108 is bonded with an inner thread sleeve 107, the inner thread sleeve 107 and the outer thread sleeve 109 are threadedly installed, the inside of the shell 108 is bonded with a magnetic cylinder 106 by adhesive, the inside of the magnetic cylinder 106 is bonded with a magnet 105 by adhesive, the inside of the shell 8 is bonded with a centering spring support sheet 103 by adhesive, the center circle hole of the centering spring support sheet 103 is inserted with a voice coil 102 and the sound coil 102 is inserted with a voice coil 102. The ring 102 is bonded to the centering spring support piece 103 by adhesive, a coil 104 is wound around the outside of the voice coil 2, a pressure ring 101 is provided on the upper end of the centering spring support piece 103, and the pressure ring 101 is bonded and installed with the shell 108. This dynamic coil erhu pickup does not change the appearance and external structure of the erhu, does not affect the playing method of the erhu, and does not affect the unique sound quality and timbre of the erhu. It samples the analog electrical signal and converts it into a digital signal, which is then processed and processed by various digital effectors, and the missing frequency is supplemented. After the deformed waveform is corrected, the sound of the erhu becomes more pleasant and more charming.

[0026] As a preferred technical solution of the present utility model, four protrusions are provided on the outer side of the shell and the protrusions are fitted and snap-fitted with the grooves on the side of the inner thread sleeve. By fitting and snap-fitting the protrusions on the outer side of the shell 108 with the grooves on the side wall of the inner thread sleeve 107, the shell 108 and the inner thread sleeve 109 can be rotated together, and then the shell 108 can be rotated by a flat-blade screwdriver to adjust the depth of the coil 104 inserted into the magnetic field gap formed between the magnet 105 and the magnetic cylinder 106.

[0027] As a preferred technical solution of the utility model, the voice coil 102 and the piano skin 21 are bonded and installed with adhesive, and an audio output socket 23 is installed at the other end of the piano body 2. The electrical signal generated by the pickup body 1 is connected to the external mixing console and pre-signal processor through the audio socket.

[0028] As a preferred technical solution of the present invention, the crossbeam 110 is fixed to the inner wall of the sound box 2 by bolts.

[0029] As a preferred technical solution of the utility model, the wire diameter of the coil is 0.03 mm and the width is 5 mm.

[0030] The working principle of the utility model is as follows: when the erhu is played, the horsetail on the bow rubs against the strings to make them vibrate, and the strings vibrate while driving the skin of the instrument to vibrate through the bridge, and the front and rear vibrations of the skin of the instrument continuously compress or stretch the air in the instrument tube to generate sparse and dense longitudinal waves. The dynamic coil erhu pickup is achieved by bonding a particularly light voice coil 2 to the skin of the instrument, and a hollow coil 4 is wound around the other end of the voice coil, and the coil 4 is just in the strong magnetic field formed by the magnet 5 and the magnetic cylinder 6. Because the coil 4 is wound around the voice coil 2, the voice coil 2 and the skin of the instrument are firmly bonded together, so As the piano skin vibrates, it drives the coil 4 wound on the voice coil 2 to do reciprocating motion in the magnetic field, that is, it constantly cuts the magnetic lines of force. At this time, an alternating electromotive force will be generated in the coil 4, and the electromotive force will form a voltage signal at both ends of the coil. The alternating frequency of the voltage signal is the vibration frequency of the piano skin, and the voltage is the amplitude of the piano skin when it vibrates. It is through the reciprocating motion of the coil 4 that the physical movement frequency and amplitude of the piano skin are converted into electrical signals, which are transmitted to the pre-signal amplifier for processing and then sent to the power amplifier to drive the speaker to produce a higher-power sound.

[0031] The circuit connection involved in the utility model is a common means used by those skilled in the art, and technical inspiration can be obtained through a limited number of experiments, and it belongs to the widely used existing technology.

[0032] Components not described in detail herein are prior art.

[0033] Although the specific embodiments of the present invention are described in detail above, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention, and modifications or deformations without creative labor are still within the scope of protection of the present invention.

Claims

1. A dynamic erhu pickup, comprising a pickup body (1), characterized in that: The pickup body (1) comprises an outer shell (108) and an outer thread sleeve (109), the outer end of the outer thread sleeve (109) is welded with a crossbeam (110), the outer side wall of the outer shell (108) is provided with an inner thread sleeve (107), the inner thread sleeve (107) and the outer thread sleeve (109) are threadedly mounted together, a magnetic cylinder (106) is installed inside the outer shell (108), a magnet (105) is installed inside the magnetic cylinder (106), a centering spring support plate (103) is arranged inside the outer shell (108), a voice coil (102) is inserted into the central circular hole of the centering spring support plate (103), a coil (104) is wound around the outside of the voice coil (102), a pressing ring (101) is arranged at the upper end of the centering spring support plate (103), and the pressing ring (101) is mounted by bonding with the outer shell (108).

2. The dynamic coil erhu pickup according to claim 1, characterized in that: Four protrusions are arranged on the outer side of the outer shell (108), and the protrusions are engaged and mounted with the grooves on the side of the inner thread sleeve (107).

3. The dynamic coil erhu pickup according to claim 1, characterized in that: The voice coil (102) and the piano skin (21) are bonded and installed using an adhesive.

4. The dynamic coil erhu pickup according to claim 1, characterized in that: The crossbeam (110) is fixedly mounted to the inner wall of the instrument body (2) via bolts.

5. The dynamic coil erhu pickup according to claim 2, characterized in that: The wire diameter of the coil is 0.03 mm and the width is 5 mm.

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