Sound recording equipment capable of reducing noise

Abstract

The invention discloses sound recording equipment capable of reducing noise, belongs to the technical field of sound recording, and aims to solve the problem that a sound outlet is possibly blocked by dust when sound recording is carried out on key occasions due to the fact that most users do not have the habit of cleaning the sound outlet once after using the sound outlet once. The sound recorder comprises a sound recorder body and a first control box and a second control box which are fixedly installed on the side wall of the sound recorder body, the sound recorder body is provided with a first cavity, the first cavity is provided with a buffer assembly for buffering a sound receiving box, the sound recorder body is provided with a plurality of fixing grooves, and the sound receiving box is arranged in the fixing grooves. According to the invention, under the cooperation of the displacement assembly and the blowing assembly, dust cleaning can be automatically carried out on the sound receiving pipe through the control of the second control box before each use, so that the situation that a user needs to manually clean the sound recording equipment before each use is avoided, and the use is convenient. Therefore, the user can use more comfortably.

Description

Technical Field

[0001] The present invention relates to the field of recording technology, and specifically to a recording device for reducing background noise. Background Art

[0002] Recording devices are devices used to capture and record sounds, and they are widely used in various scenarios such as meeting recording, music production, podcast production, audiobook recording, interviews, etc.

[0003] Most of the existing recording devices are portable for convenience, and the existing recording devices all have a certain effect of reducing background noise. However, portable recording devices are often placed in pockets, so the sound collection ports may be filled with dust, and we do not carry a device for cleaning the sound collection ports with us. At this time, noise will be generated during recording.

[0004] In view of the above problems, a recording device for reducing background noise is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a recording device for reducing background noise. By using this device for operation, the problems in the above background are solved. Most of them are portable for convenience, and the existing recording devices all have a certain effect of reducing background noise. However, portable recording devices are often placed in pockets, so the sound collection ports may be filled with dust, and we do not carry a device for cleaning the sound collection ports with us. At this time, noise will be generated during recording.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A recording device for reducing background noise, including a recorder body, a first control box and a second control box fixedly installed on the side wall of the recorder body. A first chamber is opened on the recorder body, and a buffer assembly for buffering the sound collection box is arranged on the first chamber. A number of fixing slots are opened on the recorder body, and a first spring is fixedly installed on each of the number of fixing slots. One end of each of the number of first springs is jointly provided with a sound collection box body. A number of funnel slots are opened on the recorder body, a second chamber is opened on the sound collection box body, a number of cylinders are fixedly installed on the second chamber, a limit slot is opened on each of the number of cylinders, a first electromagnet is fixedly installed on the limit slot, a second electromagnet is slidably installed on the limit slot, a second spring is arranged between the limit slot and the second electromagnet, a gyroscope is fixedly installed on the second chamber, a rubber seal is arranged on the first chamber, and a displacement assembly for cleaning the sound collection port is arranged on the sound collection box body.

[0007] Further, the displacement component includes a third chamber opened on the main body of the sound collection box. Two sliding grooves are opened on the third chamber, and two air storage boxes are slidably installed together on the two sliding grooves. A number of sound collection tubes are fixedly installed on the third chamber, and a first filter screen is fixedly installed on each of the number of sound collection tubes. Expansion tubes are fixedly installed between the two air storage boxes and the third chamber, and a third spring is arranged between the expansion tube and the air storage box. Third electromagnets are fixedly installed on the side walls of the two air storage boxes, and a purging component for blowing away the dust on the sound collection port is arranged at the upper end of the air storage box.

[0008] Further, the purging component includes a fixing plate fixedly installed at the upper end of the air storage box. A micro air pump is fixedly installed on the side wall of the fixing plate. A stamping tube is arranged between the micro air pump and the air storage box. A one-way intake valve is arranged on the axial side wall of the stamping tube. A fourth chamber is opened on the air storage box. Two exhaust pipes are fixedly installed at the lower end of the air storage box. A vibration component for shaking off the dust on the first filter screen is arranged on the sound collection tube.

[0009] Further, the vibration component includes a cross bar fixedly installed on one of the exhaust pipes. An arc-shaped block is fixedly installed at the lower end of the cross bar. Two fixing blocks are fixedly installed on the axial side wall of the sound collection tube. A rotating shaft is rotatably installed together between the two fixing blocks. An arc-shaped rod is fixedly installed on the axial side wall of the rotating shaft. A torsion spring is arranged between the arc-shaped rod and the fixing block. A detection component for detecting liquid is arranged on the main body of the tape recorder.

[0010] Further, the detection component includes an installation groove opened on the main body of the tape recorder. A liquid sensor is arranged on the installation groove. A second filter screen is fixedly installed on the installation groove.

[0011] Further, the distance between the two exhaust pipes is equal to the distance between the two sound collection tubes, and the sizes of the two exhaust pipes are consistent with the sizes of the sound collection tubes.

[0012] Further, the arc-shaped block can come into contact with the arc-shaped rod during displacement. When the arc-shaped block moves backward, the arc surfaces of the arc-shaped block and the arc-shaped rod correspond to each other.

[0013] Further, the size of the funnel-shaped groove is much larger than the size of the second electromagnet.

[0014] Further, the size of the main body of the sound collection box is smaller than the size of the first chamber.

[0015] Further, the two air storage boxes can enclose four sound collection tubes.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. Since the recording device is portable, users often directly put it into their pockets and take it out for use directly. Most people do not have the habit of cleaning the sound outlet every time they use it. This may cause the sound outlet of the recording device to be blocked by dust during recording in key situations, resulting in excessive noise during the recording process and affecting the recording quality. With the cooperation of the displacement component and the purging component, the dust in the sound receiving tube can be cleaned by controlling through the second control box before each use, avoiding the above situation during use and thus leading to low recording effect quality.

[0018] 2. With the cooperation of the second control box, the third electromagnet, the air storage box, the sliding groove, the telescopic tube, the third spring, the exhaust pipe, the sound receiving tube, the micro air pump, the stamping tube, the gas and the fourth chamber, the huge air pressure discharged from the exhaust pipe will clean all the dust adsorbed on the first filter screen, clean the dust in the sound receiving tube, and avoid the blockage of the sound receiving tube, resulting in noise during the recording process.

[0019] 3. With the cooperation of the second control box, the third electromagnet, the air storage box, the sliding groove, the exhaust pipe, the arc-shaped block and the arc-shaped rod, the arc-shaped block squeezes the arc-shaped rod. When the force is released, at this time, the arc-shaped rod vibrates the sound receiving tube through the action of the torsion spring, causing the difficult-to-clean dust adsorbed on the first filter screen to fall off, and then blowing away all the dust through the micro air pump to further clean the dust on the sound receiving port. When the recorder body falls into water, with the cooperation of water, the second filter screen, the installation groove, the liquid sensor, the second control box, the third electromagnet, the air storage box and the sliding groove, then the two air storage boxes form a sealed space, avoiding water from entering the first chamber through the sound receiving tube and finally causing damage to the recorder body.

[0020] 4. Under the action of the gyroscope, the signal, the first control box, the first electromagnet, the second electromagnet, the second spring, the limiting groove and the first spring, the impact force of the sound receiving box body can be greatly alleviated, avoiding the sound receiving port of the sound receiving box body from being damaged. There are gaps between the sound receiving box body and the upper, lower, left, right and rear ends of the first chamber, which can give sufficient displacement for the shaking of the sound receiving box body. The rubber seal outside the first chamber can further reduce the impact force of the sound receiving box body, protect the sound receiving box body, and at the same time avoid dust from entering the first chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the overall structural schematic diagram of the present invention;

[0022] Figure 2 is the partial cross-sectional view of the buffer component of the present invention;

[0023] Figure 3 is the cross-sectional view of the buffer component of the present invention;

[0024] Figure 4 The enlarged view of part A of Figure 3 of the present invention;

[0025] Figure 5 The sectional view of the buffer component of the present invention;

[0026] Figure 6 The sectional view of the displacement component of the present invention;

[0027] Figure 7 The sectional view of the purging component of the present invention;

[0028] Figure 8 The sectional view of the vibration component of the present invention;

[0029] Figure 9 The Figure 8 enlarged view of part B of the present invention;

[0030] Figure 10 The sectional view of the detection component of the present invention.

[0031] In the figure: 1. Recorder body; 11. First control box; 12. Second control box; 13. First chamber; 2. Buffer component; 21. Fixed groove; 22. First spring; 23. Radio cassette body; 24. Funnel groove; 25. Second chamber; 26. Cylinder; 27. Limiting groove; 28. First electromagnet; 29. Second electromagnet; 201. Second spring; 202. Gyroscope; 203. Rubber seal; 3. Displacement component; 31. Third chamber; 32. Slide groove; 33. Radio tube; 34. First filter screen; 35. Air storage box; 36. Telescopic tube; 37. Third spring; 38. Third electromagnet; 4. Purging component; 41. Fixed plate; 42. Micro air pump; 43. Stamping tube; 44. One-way intake valve; 45. Fourth chamber; 46. Exhaust pipe; 5. Vibration component; 51. Cross bar; 52. Arc-shaped block; 53. Fixed block; 54. Rotating shaft; 55. Arc-shaped rod; 56. Torsion spring; 6. Detection component; 61. Installation groove; 62. Liquid sensor; 63. Second filter screen. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] To solve the technical problem that the sound pickup port of the recorder body 1 is damaged when it falls to the ground, as Figures 1 - 5As shown in the figure, the following preferred technical solutions are provided: A recording device for reducing noise, including a recorder body 1, a first control box 11 and a second control box 12 fixedly installed on the side wall of the recorder body 1. A first chamber 13 is provided on the recorder body 1. A buffer assembly 2 for buffering the sound collection box is provided on the first chamber 13. A number of fixing slots 21 are provided on the recorder body 1, and a first spring 22 is fixedly installed on each of the number of fixing slots 21. One end of the number of first springs 22 is jointly provided with a sound collection box body 23. A number of funnel slots 24 are provided on the recorder body 1. A second chamber 25 is provided on the sound collection box body 23. A number of cylinders 26 are fixedly installed on the second chamber 25. A limit slot 27 is provided on each of the number of cylinders 26. A first electromagnet 28 is fixedly installed on the limit slot 27. A second electromagnet 29 is slidably installed on the limit slot 27. A second spring 201 is provided between the limit slot 27 and the second electromagnet 29. A gyroscope 202 is fixedly installed on the second chamber 25. When the gyroscope 202 generates a large deviation, for example, when the recorder body 1 falls from a high altitude, at this time, the gyroscope 202 transmits a signal to the first control box 11. The first control box 11 energizes the first electromagnet 28, so as to attract the second electromagnet 29, making the second electromagnet 29 be sucked into the limit slot 27, so that the sound collection box body 23 is disconnected from the hard connection with the first chamber 13. Under the action of the first spring 22, the impact force of the sound collection box body 23 can be greatly alleviated. A rubber seal 203 is provided on the first chamber 13. The function of the rubber seal 203 can not only reduce the shaking range of the sound collection box body 23, but also prevent the first chamber 13 from being filled with dust. A displacement assembly 3 for cleaning the sound collection port is provided on the sound collection box body 23.

[0034] The size of the funnel slot 24 is much larger than the size of the second electromagnet 29. When the second electromagnet 29 comes out of the limit slot 27, it can enter the funnel slot 24. Because the arc surface of the funnel slot 24 is the same as the arc surface of the second electromagnet 29, the second electromagnet 29 can be smoothly restored to its original position through the second spring 201.

[0035] The size of the sound collection box body 23 is smaller than the size of the first chamber 13, and there are gaps between the upper, lower, left, right and rear ends of the sound collection box body 23 and the first chamber 13.

[0036] Specifically, when the tape recorder body 1 carried with one accidentally drops, the suddenly generated huge downward impact force causes the gyroscope 202 to react, and then the signal is transmitted to the first control box 11. Then, the first electromagnet 28 is energized through the first control box 11, so that the first electromagnet 28 attracts the second electromagnet 29. At this time, the second electromagnet 29 compresses the second spring 201 and enters the limit groove 27. At this time, the radio cassette body 23 is disengaged from the hard connection with the first chamber 13. Under the action of the first spring 22, the impact force of the radio cassette body 23 can be greatly alleviated, avoiding the damage of the sound pickup port of the radio cassette body 23. There are gaps between the radio cassette body 23 and the first chamber 13 in the up, down, left, right and rear directions, which can provide sufficient shaking displacement for the radio cassette body 23. The rubber seal 203 outside the first chamber 13 can further reduce the impact force of the radio cassette body 23 and also protect the radio cassette body 23, while also preventing dust from entering the first chamber 13. When the tape recorder body 1 is in a stable state, the gyroscope 202 returns to its original state, and the first control box 11 de-energizes the first electromagnet 28. At this time, the first electromagnet 28 loses the suction force on the second electromagnet 29, so that the second electromagnet 29 enters the funnel groove 24 under the action of the second spring 201. Because the size of the funnel groove 24 is much larger than that of the second electromagnet 29, the second electromagnet 29 can enter the funnel groove 24, and finally the second electromagnet 29 returns to its original state.

[0037] To solve the technical problem that most people do not have the habit of cleaning the sound outlet once after each use, which may lead to the dust clogging of the recording sound outlet during recording in key occasions, resulting in excessive noise during recording and affecting the recording quality, as Figure 6 and Figure 7 shown, the following preferred technical solutions are provided: The displacement assembly 3 includes a third chamber 31 opened on the radio cassette body 23. Two sliding grooves 32 are opened on the third chamber 31. Two air storage boxes 35 are slidably installed on the two sliding grooves 32 together. A plurality of sound pickup tubes 33 are fixedly installed on the third chamber 31. First filter nets 34 are fixedly installed on the plurality of sound pickup tubes 33. Expansion tubes 36 are fixedly installed between the two air storage boxes 35 and the third chamber 31. A third spring 37 is arranged between the expansion tube 36 and the air storage box 35. Third electromagnets 38 are fixedly installed on the side walls of the two air storage boxes 35. A purging assembly 4 for blowing away the dust on the sound pickup port is arranged at the upper end of the air storage box 35.

[0038] The purging assembly 4 includes a fixing plate 41 fixedly installed at the upper end of the air storage box 35. A micro air pump 42 is fixedly installed on the side wall of the fixing plate 41. A stamping pipe 43 is arranged between the micro air pump 42 and the air storage box 35. A one-way intake valve 44 is arranged on the axial side wall of the stamping pipe 43. The model of the one-way intake valve 44 is 317010. When the micro air pump 42 moves backward in the stamping pipe 43, the one-way intake valve 44 can be opened to allow gas to enter the stamping pipe 43. A fourth chamber 45 is formed on the air storage box 35. Two exhaust pipes 46 are fixedly installed at the lower end of the air storage box 35. The stamping pipe 43 is communicated with the air storage box 35. Both of the two exhaust pipes 46 are communicated with the air storage box 35. A vibration assembly 5 for shaking off the dust on the first filter screen 34 is arranged on the sound receiving pipe 33.

[0039] The distance between the two exhaust pipes 46 is equal to the distance between the two sound receiving pipes 33. The sizes of the two exhaust pipes 46 are consistent with those of the sound receiving pipes 33. When the two exhaust pipes 46 are displaced above the two sound receiving pipes 33, the exhaust pipes 46 are in contact with the sound receiving pipes 33 at this time, and the gas in the exhaust pipes 46 can blow away the dust on the sound receiving pipes 33.

[0040] Specifically, before each use, the second control box 12 is started to energize the two third electromagnets 38. At this time, the two third electromagnets 38 attract each other, driving the two air storage boxes 35 to slide towards the middle through the sliding grooves 32, stretching the telescopic pipes 36 and the third springs 37. At this time, the two third electromagnets 38 come into contact with each other. At this time, the displacements of the four exhaust pipes 46 are all the same as those of the four sound receiving pipes 33. Subsequently, the micro air pump 42 is started to squeeze the gas in the stamping pipe 43 to form air pressure, so that the air pressure enters the fourth chamber 45 and is discharged from the exhaust pipes 46. The huge pressure will clean all the dust adsorbed on the first filter screen 34 and clean the dust in the sound receiving pipes 33, avoiding blockage of the sound receiving pipes 33 and causing poor recording quality. After cleaning, the second control box 12 is closed at this time to cut off the power supply of the two third electromagnets 38. At this time, the two air storage boxes 35 return to their original states through the two third springs 37, and then the tape recorder body 1 can be used continuously.

[0041] To solve the technical problem that the tape recorder body 1 accidentally falls into water and causes damage to the tape recorder body 1, as Figures 6 - 10 shown, the following preferred technical solution is provided: The vibration assembly 5 includes a cross bar 51 fixedly installed on one of the exhaust pipes 46. An arc-shaped block 52 is fixedly installed at the lower end of the cross bar 51. Two fixing blocks 53 are fixedly installed on the axial side wall of the sound receiving pipe 33. A rotating shaft 54 is rotatably installed between the two fixing blocks 53. An arc-shaped rod 55 is fixedly installed on the axial side wall of the rotating shaft 54. A torsion spring 56 is arranged between the arc-shaped rod 55 and the fixing block 53. A detection assembly 6 for detecting liquid is arranged on the tape recorder body 1.

[0042] The detection component 6 includes an installation groove 61 formed on the tape recorder body 1. A liquid sensor 62 is arranged on the installation groove 61. The model of the liquid sensor 62 is YTWD-A1. When the liquid sensor 62 comes into contact with liquid, it will transmit a signal to the second control box 12. At this time, the second control box 12 will energize the third electromagnet 38, causing the two air storage boxes 35 to move towards the middle, playing a role in sealing. A second filter screen 63 is fixedly installed on the installation groove 61. During the displacement process, the arc-shaped block 52 can come into contact with the arc-shaped rod 55. The arc-shaped block 52 can squeeze the arc-shaped rod 55, causing one end of the arc-shaped rod 55 to deviate from the sound collection tube 33. When the force is released, the arc-shaped rod 55 strikes the first filter screen 34 under the action of the torsion spring 56. When the arc-shaped block 52 moves backward, the arc surface of the arc-shaped block 52 corresponds to the arc surface of the arc-shaped rod 55. At this time, the arc-shaped block 52 will not squeeze the arc-shaped rod 55 either.

[0043] The two air storage boxes 35 can surround the four sound collection tubes 33, preventing water from entering the inner wall of the tape recorder body 1 through the sound collection tubes 33 and damaging the tape recorder body 1.

[0044] Specifically, when the second control box 12 is started to energize the two third electromagnets 38, at this time, the two third electromagnets 38 attract each other, driving the two air storage boxes 35 to slide towards the middle through the sliding grooves 32. At this time, the arc-shaped block 52 on the exhaust pipe 46 squeezes the arc-shaped rod 55, causing one end of the arc-shaped rod 55 to deviate from the sound collection tube 33. When the force is released, at this time, the arc-shaped rod 55 vibrates the sound collection tube 33 under the action of the torsion spring 56, causing the difficult-to-clean dust adsorbed on the first filter screen 34 to fall off, and then all the dust is blown away by the micro air pump 42, further cleaning the dust on the sound collection port. When the tape recorder body 1 falls into water, at this time, the water enters the installation groove 61 through the second filter screen 63. At this time, the liquid sensor 62 receives the signal and will start the second control box 12 to energize the two third electromagnets 38. At this time, the two third electromagnets 38 attract each other, driving the two air storage boxes 35 to slide towards the middle through the sliding grooves 32. Then the two air storage boxes 35 form a closed space, preventing water from entering the first chamber 13 through the sound collection tubes 33 and finally damaging the tape recorder body 1.

[0045] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0046] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A recording device for reducing noise, comprising a recording device body (1) and a first control box (11) and a second control box (12) fixedly mounted on the side wall of the recording device body (1), wherein the recording device body (1) is provided with a first chamber (13), characterized in that: The first chamber (13) is provided with a buffer component (2) for buffering the sound box, the recorder body (1) is provided with a plurality of fixing grooves (21), a plurality of first springs (22) are fixedly mounted on the fixing grooves (21), a sound box body (23) is commonly provided at one end of the plurality of first springs (22), the recorder body (1) is provided with a plurality of funnel grooves (24), the sound box body (23) is provided with a second chamber (25), a plurality of cylinders (26) are fixedly mounted on the second chamber (25), if A limiting groove (27) is provided on each of the cylinders (26), a first electromagnet (28) is fixedly mounted on the limiting groove (27), a second electromagnet (29) is slidably mounted on the limiting groove (27), a second spring (201) is arranged between the limiting groove (27) and the second electromagnet (29), a gyroscope (202) is fixedly mounted on the second chamber (25), a rubber seal (203) is arranged on the first chamber (13), and a displacement component (3) for cleaning the sound receiving port is arranged on the sound receiving box body (23).

2. A noise-reducing recording device according to claim 1, characterized in that: The displacement assembly (3) comprises a third chamber (31) provided on the sound receiving box body (23), two slide grooves (32) provided on the third chamber (31), two air storage boxes (35) slidably mounted on the two slide grooves (32), a plurality of sound receiving tubes (33) fixedly mounted on the third chamber (31), a first filter (34) fixedly mounted on each of the plurality of sound receiving tubes (33), a telescopic tube (36) fixedly mounted between the two air storage boxes (35) and the third chamber (31), a third spring (37) arranged between the telescopic tube (36) and the air storage box (35), a third electromagnet (38) fixedly mounted on the side walls of the two air storage boxes (35), and a purge assembly (4) for blowing away dust on the sound receiving port arranged at the upper end of the air storage box (35).

3. A noise-reducing recording device according to claim 2, characterized in that: The purge assembly (4) comprises a fixing plate (41) fixedly mounted on the upper end of the air storage box (35); a micro air pump (42) is fixedly mounted on the side wall of the fixing plate (41); a punching tube (43) is arranged between the micro air pump (42) and the air storage box (35); a one-way air inlet valve (44) is arranged on the axial side wall of the punching tube (43); a fourth chamber (45) is opened on the air storage box (35); two exhaust pipes (46) are fixedly mounted on the lower end of the air storage box (35); and a vibration assembly (5) for shaking off dust on the first filter screen (34) is arranged on the sound receiving tube (33).

4. A noise-reducing recording device according to claim 3, characterized in that: The vibration component (5) comprises a cross bar (51) fixedly mounted on one of the exhaust pipes (46), an arc block (52) fixedly mounted on the lower end of the cross bar (51), two fixed blocks (53) fixedly mounted on the axial side wall of the sound receiving tube (33), a rotating shaft (54) rotatably mounted between the two fixed blocks (53), an arc rod (55) fixedly mounted on the axial side wall of the rotating shaft (54), a torsion spring (56) arranged between the arc rod (55) and the fixed block (53), and a detection component (6) for detecting liquid is arranged on the recorder body (1).

5. A noise-reducing recording device according to claim 4, characterized in that: The detection component (6) comprises a mounting groove (61) provided on the recorder body (1), a liquid sensor (62) being arranged on the mounting groove (61), and a second filter screen (63) being fixedly mounted on the mounting groove (61).

6. A noise-reducing recording device according to claim 4, characterized in that: The distance between the two exhaust pipes (46) is equal to the distance between the two sound receiving pipes (33), and the size of the two exhaust pipes (46) is consistent with the size of the sound receiving pipes (33).

7. A noise-reducing recording device according to claim 4, characterized in that: The arc block (52) can come into contact with the arc rod (55) during the displacement process. When the arc block (52) is displaced backward, the arc surface of the arc block (52) corresponds to the arc surface of the arc rod (55).

8. The noise-reducing recording device according to claim 1, characterized in that: The size of the funnel groove (24) is much larger than the size of the second electromagnet (29).

9. The noise-reducing recording device according to claim 1, characterized in that: The size of the sound box body (23) is smaller than the size of the first chamber (13).

10. A noise-reducing recording device according to claim 2, characterized in that: The two air storage boxes (35) can surround the four sound receiving tubes (33).

Images