Electro-acoustic sound amplification erhu

Abstract

The utility model discloses an electroacoustic sound amplification erhu, which comprises an erhu cylinder and an erhu rod vertically arranged on the erhu cylinder, an integrated power amplifier module is arranged in the erhu cylinder, one end of the erhu cylinder is provided with a piezoelectric ceramic piece, one side of the piezoelectric ceramic piece far away from the erhu cylinder is fixedly connected with an erhu bridge, and the erhu bridge is fixedly connected with the integrated power amplifier module. The piezoelectric ceramic piece is electrically connected with the integrated power amplifier module, the bottom of the sound box is fixedly connected with strings, the ends, away from the sound box, of the strings are fixedly connected with the rod, and the strings abut against the bridge. According to the utility model, the vibration of the strings drives the piezoelectric ceramic piece to generate vibration, an electric signal with the same frequency as the vibration frequency of the strings is generated through the piezoelectric effect, and the volume is amplified through the integrated power amplifier module, so that students in the back row can clearly hear the tone played by a teacher, and the sound can be visually demonstrated to be generated by the vibration of an object. The demonstration effect of the experiment is obviously enhanced, and the teaching experience is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the erhu technical field, especially relates to a sound amplification erhu of electric sound. BACKGROUND

[0002] Erhu is one of the musical instruments that have been spread for a long time in China and are loved and familiar to Chinese people. Using simple and easily available materials to make an "electric sound erhu" teaching aid for relevant demonstration experiments can achieve good teaching results.

[0003] The erhu made of simple materials has limited sound, and students sitting in the back row cannot specifically hear the tone played by the teacher during the demonstration, thereby affecting the teaching experience. Therefore, we propose a sound amplification erhu. UTILITY MODEL CONTENT

[0004] The utility model proposes the following technical scheme in view to the problems in the prior art:

[0005] A sound amplification erhu of electric sound, including the barrel and the vertical installation on the barrel rod, the inside of the barrel is provided with the integrated playback module, and one end of the barrel is provided with the piezoelectric ceramic sheet, the side of the piezoelectric ceramic sheet away from the barrel is fixedly connected with the bridge, and the piezoelectric ceramic sheet and the integrated playback module are electrically connected, the bottom of the barrel is fixedly connected with the string, the end of the string away from the barrel is fixedly connected with the rod, and the string and the bridge are in abutment.

[0006] As a preferred technical scheme of the above, the barrel includes a barrel body, the two ends of the barrel body are fixedly connected with a skin and a back plate respectively, and the axis of the piezoelectric ceramic sheet overlaps the axis of the skin.

[0007] As a preferred technical scheme of the above, the rod includes a rod body and a peg, the peg is in interference fit with the rod body, and the peg is arranged in parallel with the barrel body.

[0008] As a preferred technical scheme of the above, the barrel body is provided with a first circular hole, a second circular hole and a third circular hole, and one end of the rod body is threadedly connected with the third circular hole through the first circular hole.

[0009] As a preferred technical scheme of the above, the integrated playback module is electrically connected with a power supply, a loudspeaker and a potentiometer, the power supply, the loudspeaker and the potentiometer are all fixed on the inner wall of the barrel body, and the potentiometer penetrates through the second circular hole.

[0010] The utility model has the advantages of:

[0011] 1. The utility model discloses a string vibration drives piezoelectric ceramic sheet to produce vibration, through piezoelectric effect, and then produce the electric signal same with string vibration frequency, after again through the integrated amplification module amplification volume, make the student of back row also can clearly hear the tone that teacher plays out, can directly demonstrate that the sound is produced by the vibration of object, significantly enhanced the demonstration effect of experiment, improve teaching experience.

[0012] 2. The utility model discloses when the string applies external force to piezoelectric ceramic sheet and makes it vibrate deformation, the internal crystal lattice structure will change, thereby leading to the relative displacement of positive and negative charge center, make piezoelectric ceramic sheet surface appear polarized charge, and then on its electrode will produce electric signal. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The structure schematic diagram of a kind of electroacoustic sound amplification erhu in the embodiment is shown;

[0014] Figure 2 The structure schematic diagram of the string tube in the embodiment is shown;

[0015] Figure 3 The structure block diagram of the integrated amplification module in the embodiment is shown.

[0016] REFERENCE SIGNS:

[0017] 11, string tube; 111, barrel body; 112, first round hole; 113, second round hole; 114, third round hole; 115, string skin; 116, back plate; 12, string rod; 121, rod body; 122, string shaft; 13, piezoelectric ceramic sheet; 14, string weight; 15, string; 20, integrated amplification module; 21, power supply; 22, loudspeaker; 23, potentiometer. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the utility model embodiment more clear, the utility model technical scheme will be described clearly and completely below in combination with embodiment.

[0019] EMBODIMENT

[0020] As Figure 1 , Figure 2 and Figure 3As shown, an electrically amplified Erhu includes a tube 11 and a neck 12 vertically mounted on the tube 11, the inside of the tube 11 is provided with a integrated amplifier module 20, and one end of the tube 11 is provided with a piezoelectric ceramic sheet 13, the side of the piezoelectric ceramic sheet 13 away from the tube 11 is fixedly connected with a bridge 14, and the piezoelectric ceramic sheet 13 is electrically connected with the integrated amplifier module 20, the signal line of the piezoelectric ceramic sheet 13 is connected at the AUX input hole of the integrated amplifier module 20, the bottom of the tube 11 is fixedly connected with a string 15, the end of the string 15 away from the tube 11 is fixedly connected with the neck 12, and the string 15 abuts against the bridge 14.

[0021] Specifically, the vibration of the string 15 drives the piezoelectric ceramic sheet 13 to vibrate, and through the piezoelectric effect, an electric signal with the same frequency as the vibration of the string 15 is generated, and then the volume is amplified by the integrated amplifier module 20, which can directly demonstrate that sound is generated by the vibration of objects, and significantly enhances the demonstration effect of the experiment.

[0022] When the string 15 applies an external force to the piezoelectric ceramic sheet 13 to make it vibrate and deform, the crystal lattice structure inside the piezoelectric ceramic sheet 13 will change, causing the positive and negative charge centers to move relatively, so that polarization charges appear on the surface of the piezoelectric ceramic sheet 13, and then an electric signal will be generated on the electrode thereof.

[0023] As shown in Figure 1 and Figure 2 , the tube 11 includes a barrel 111, and the barrel 111 is fixedly connected with a skin 115 and a back plate 116 at both ends, respectively, and the axis of the piezoelectric ceramic sheet 13 overlaps the axis of the skin 115.

[0024] It should be noted that the diameter of the barrel 111 is 90mm, the height is 150mm, the distance between the first circular hole 112 and the skin 115 is 30mm, and the skin 115 is used as a "skin".

[0025] As shown in Figure 1 , the neck 12 includes a rod body 121 and a peg 122, the peg 122 is interference fit with the rod body 121, and the peg 122 is arranged in parallel with the barrel 111.

[0026] It should be noted that the distance between the barrel 111 and the closest peg 122 is 370mm, the tightness of the string 15 can be adjusted by rotating the peg 122, the string 15 is fixed on the bottom outer wall of the barrel 111 by a bolt, and the distance between the string 15 and the skin 115 is 10mm.

[0027] As shown in Figure 1 and Figure 2 , the barrel 111 is provided with a first circular hole 112, a second circular hole 113 and a third circular hole 114, and one end of the rod body 121 passes through the first circular hole 112 and is threadedly connected with the third circular hole 114.

[0028] It should be noted that the diameter of the first circular hole 112 is 16 mm, the diameter of the second circular hole 113 is 7 mm, the diameter of the third circular hole 114 is 10 mm, the diameter of the skin 115 is 90 mm, the thickness is 3 mm, the diameter of the back plate 116 is 90 mm, the thickness is 3 mm, and the diameter of the piezoelectric ceramic sheet 13 is 27 mm.

[0029] Specifically, the cylinder body 111 is made of PVC material, the skin 115 and the back plate 116 are both made of organic glass, the skin 115 is milky white, and the back plate 116 is transparent.

[0030] As shown in Figure 1 , Figure 2 and Figure 3 , the integrated amplifier module 20 is electrically connected with the power supply 21, the loudspeaker 22 and the potentiometer 23, the power supply 21, the loudspeaker 22 and the potentiometer 23 are all fixed on the inner wall of the cylinder body 111, and the potentiometer 23 penetrates through the second circular hole 113.

[0031] Specifically, when improved later, another potentiometer 23 can be added to further improve the sound effect of different frequency bands.

[0032] Working principle: first, check the line connection of the integrated amplifier module 20 with the string 15, the power supply 21, the loudspeaker 22 and the potentiometer 23, then adjust the tightness of the string 15, turn on the power supply 21 switch, and try to pull the bow, the bow can be rubbed back and forth with rosin to increase the friction, and the volume can be adjusted to an appropriate size through the potentiometer 23;

[0033] When demonstrating, pull the bow, the bow hair rubs the string 15 to produce vibration and sound, which shows that sound is produced by the vibration of objects;

[0034] The vibration of the string 15 drives the piezoelectric ceramic sheet 13 to vibrate, through the piezoelectric effect, and then generates an electric signal with the same frequency as the vibration of the string 15, and the volume can be greatly improved after being amplified by the integrated amplifier module 20, which significantly enhances the demonstration effect of the experiment;

[0035] The vibration produces regular and accurate high-pitched sound called music, and the vibration produces irregular, non-fixed pitch or non-obvious pitch sound called noise; this teaching aid can produce fixed pitch sound, so it is music; and the sound produced by similar cars passing or knocking on the table has no fixed pitch, so it is noise;

[0036] By changing the position of the fingers pressing the string 15 or rotating the peg 122, the length and tightness of the string 15 can be changed, and then the pitch of the string 15 can be adjusted, that is, the high and low of the tone; by regularly changing the length and tightness of the string 15, continuous music can be produced, and beautiful music can be played.

[0037] The above examples are only used to illustrate the technical solutions of the present application, and are not limiting.

Claims

1. An electro-acoustic Erhu, comprising a body (11) and a neck (12) vertically mounted on the body (11), characterized in that: The inside of the sound box (11) is provided with a integrated amplifier module (20), and one end of the sound box (11) is provided with a piezoelectric ceramic sheet (13), one side of the piezoelectric ceramic sheet (13) away from the sound box (11) is fixedly connected with a bridge (14), and the piezoelectric ceramic sheet (13) is electrically connected with the integrated amplifier module (20), the bottom of the sound box (11) is fixedly connected with a string (15), one end of the string (15) away from the sound box (11) is fixedly connected with a stick (12), and the string (15) is abutted with the bridge (14).

2. An electro-acoustic amplified erhu according to claim 1, wherein, The sound box (11) comprises a barrel (111), both ends of the barrel (111) are fixedly connected with a skin (115) and a back plate (116), respectively, the axis of the piezoelectric ceramic sheet (13) overlaps the axis of the skin (115).

3. An electro-acoustic amplified erhu according to claim 2, wherein, The stick (12) comprises a stick body (121) and a stick shaft (122), the stick shaft (122) is interference fit with the stick body (121), and the stick shaft (122) is arranged in parallel with the barrel (111).

4. An electro-acoustic amplified erhu according to claim 3, wherein, The barrel (111) is provided with a first circular hole (112), a second circular hole (113) and a third circular hole (114), one end of the stick body (121) is screwed through the first circular hole (112) and the third circular hole (114).

5. The electro-acoustic amplified erhu of claim 2, wherein, The integrated amplifier module (20) is electrically connected with a power supply (21), a loudspeaker (22) and a potentiometer (23), the power supply (21), the loudspeaker (22) and the potentiometer (23) are all fixed on the inner wall of the barrel (111), and the potentiometer (23) penetrates through the second circular hole (113).

Images