A square high-sensitivity microphone tube

Abstract

The present invention provides a square high-sensitivity microphone tube, comprising a square outer tube, a gain inner tube built into the square outer tube, and a microphone built into the gain inner tube, wherein the square outer tube comprises an outer shell, a top cover, and a bottom cover, and the gain inner tube comprises a lower sound inlet tube and an upper sound inlet tube fixed to the top of the lower sound inlet tube, wherein the outer shell comprises at least one sound inlet plane, a top sound inlet hole is provided at the top of the top cover, and at least one air inlet hole is provided on the wall of the lower sound inlet tube. The present invention arranges a gain inner tube in the square outer tube, so as to improve the sensitivity of the effective part of the language segment in a targeted manner, suppress the sensitivity of the high-frequency part of the frequency response of the microphone outside the human voice range, delay the time of sound feedback, and improve the physical characteristics of the original microphone sensitivity from 100Hz in the low-frequency part, so that it is easier to pick up the low-frequency band of the sound source when picking up sound, and the sound is fuller and rounder. The improvement of the sensitivity of the mid-frequency band makes the language segment more readable, and the overall microphone sensitivity is improved.

Description

Technical Field

[0001] The invention belongs to the field of microphone sound transmission, and in particular relates to a square high-sensitivity microphone tube. Background Art

[0002] Microphone tubes are widely used in many conference sites, remote video conferences or on-site sound reinforcement occasions. They mainly play the role of sound propagation and signal amplification. Especially in various conference occasions, the requirements for microphone tubes are becoming more and more stringent, including their appearance and effects.

[0003] As people's requirements for microphone tubes are getting higher and higher, square microphone tubes are being used more and more due to their novel and beautiful appearance. However, the overall sensitivity of square microphone tubes is not high and the sound quality is not good. The square tubular structure inside the microphone tube causes uneven air intake and exhaust inside, and the sound field is not ideal, resulting in the inability to bring out the characteristics of the original microphone. In order to improve the readability of the language, only 1000Hz forward sensitivity can be guaranteed, and the original microphone is deliberately required to attenuate the low-frequency sensitivity below 400Hz in the frequency response, which will make the sound dry and not full. The audience will feel harsh and irritable if they immerse themselves in this auditory environment for a long time. It is also impossible to overcome this problem by changing the physical structure of the square microphone tube itself, otherwise its appearance will be destroyed. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a square high-sensitivity microphone tube. By arranging a gain inner tube in the square outer tube, the sound field entering the microphone built in the gain inner tube is optimized and improved, the influence of the square outer tube on the sound field is reduced, and the sensitivity is only improved for the effective part of the language segment (250-5000Hz), the sensitivity of the high-frequency part of the frequency response of the microphone outside the human voice range is suppressed, and the howling of the high-frequency part is effectively avoided. The sensitivity of the low-frequency part of the microphone frequency response is improved from 100Hz. The physical characteristics of the original microphone sensitivity are improved, so that the microphone is easier to pick up the low-frequency band of the sound source (such as appropriate reflected sound) when picking up sound, but there is attenuation below 50Hz, which can reduce the noise of the picked up sound and improve the readability of the language segment. It has the characteristics of improving the microphone sensitivity and ensuring the sound restoration and quality.

[0005] The present invention provides a square high-sensitivity microphone tube, comprising a square outer tube, a gain inner tube built into the square outer tube, and a microphone built into the gain inner tube;

[0006] The square outer tube comprises an outer shell, a top cover and a bottom cover, wherein the top cover is arranged on the top of the outer shell and is fixedly connected with the top of the outer shell, the bottom cover is arranged on the bottom of the outer shell and is fixedly connected with the bottom of the outer shell, the outer shell comprises at least one sound inlet plane, the sound inlet plane is fixed with a side net of a porous structure for improving the uniformity and patency of airflow, and the top of the top cover is provided with a top-inlet sound hole, and the top-inlet sound hole is fixed with a top-inlet sound pipe net of a porous structure for improving the uniformity and patency of airflow;

[0007] The gain inner tube includes a lower sound inlet tube and an upper sound inlet tube fixed to the top of the lower sound inlet tube, the upper sound inlet tube and the lower sound inlet tube are both hollow tubular structures, the inner wall of the lower sound inlet tube is provided with a limiting inner boss for clamping and fixing the microphone, the outer wall of the lower sound inlet tube is provided with a limiting outer boss for clamping the top of the outer shell, at least one air inlet hole is provided on the wall surface of the lower sound inlet tube, and the top of the outer shell is provided with a limiting concave ring matching the limiting outer boss.

[0008] Furthermore, there are two sound input planes, namely a corresponding front sound input plane and a rear sound input plane.

[0009] Furthermore, an internal thread is provided inside the upper sound inlet pipe, and an external thread corresponding to the internal thread of the upper sound inlet pipe is provided on the top of the lower sound inlet pipe.

[0010] Furthermore, the top-inlet sound pipe network abuts against the top end of the upper-inlet sound pipe.

[0011] Furthermore, the distance between the top of the microphone fixed to the inner limiting boss and the top-injected sound pipe network is not less than 10 mm.

[0012] Furthermore, the lower sound inlet pipe is a circular tubular structure.

[0013] Furthermore, six air inlet holes are arranged on the wall surface of the lower sound inlet pipe and are evenly distributed along the circumference of the wall surface. The air inlet holes are oblong hole structures.

[0014] Furthermore, the total length of the air inlet hole of the oblong hole structure is 24.4 mm, and both ends are semicircles with a diameter of 4 mm.

[0015] Furthermore, the housing comprises an upper housing provided with a sound inlet plane and a lower housing fixedly connected to the upper housing, and the lower housing is fixed with a fixing plate for connecting with an external fixing base.

[0016] Furthermore, a fixed connection belt is provided between the upper shell and the lower shell, and the fixed connection belt includes at least one LED lamp.

[0017] Beneficial effects of the present invention:

[0018] The present invention provides a square high-sensitivity microphone tube, comprising a square outer tube, a gain inner tube built into the square outer tube and a microphone built into the gain inner tube, the square outer tube comprising an outer shell, a top cover and a bottom cover, the gain inner tube comprising a lower sound inlet tube and an upper sound inlet tube fixed to the top of the lower sound inlet tube, wherein the outer shell comprises at least one sound inlet plane, and a side net is fixed on the sound inlet plane, a top inlet sound hole is opened on the top of the top cover, and a top inlet sound pipe net is fixed at the top inlet sound hole, the lower sound inlet tube is clamped on the top of the outer shell and at least one air inlet hole is arranged on the wall surface thereof.

[0019] The present invention optimizes and improves the sound field of the microphone built in the gain inner tube by arranging a gain inner tube in the square outer tube, reduces the influence of the square outer tube on the sound field, improves the sensitivity of only the effective part (250-5000Hz) of the language segment, suppresses the sensitivity of the high-frequency part of the frequency response of the microphone outside the human voice range, effectively avoids the howling of the high-frequency part, and improves the physical characteristics of the original microphone sensitivity from 100Hz in the low-frequency part of the microphone frequency response, so that the microphone is easier to pick up the low-frequency band of the sound source (such as appropriate reflected sound) when picking up sound, but has attenuation below 50Hz, can reduce the noise of the picked up sound, improve the readability of the language segment, and has the characteristics of improving the sensitivity of the microphone and ensuring the sound restoration and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0021] Figure 1 It is a front view of the overall structure of the square high-sensitivity microphone tube provided by the present invention.

[0022] Figure 2 The figure is a side view of the overall structure of the square high-sensitivity microphone tube provided by the present invention.

[0023] Figure 3 The figure is a schematic diagram of the overall structure of the gain inner tube in the square high-sensitivity microphone tube provided by the present invention.

[0024] Figure 4 It is a side sectional view of the overall structure of the square high-sensitivity microphone tube provided by the present invention.

[0025] Figure 5 The square high-sensitivity microphone tube provided by the present invention is Figure 4 Enlarged view of part A in .

[0026] Figure 6 It is a frequency response curve diagram of the original microphone EM150-7P involved in the present invention.

[0027] Figure 7 It is the sensitivity curve measured at an angle of 0 degrees by the original microphone EM150-7P involved in the present invention.

[0028] Figure 8 It is a frequency response curve diagram of the original microphone EM150-7P involved in the present invention installed in the microphone tube provided by the present invention.

[0029] Fig. 9 It is a sensitivity curve measured at an angle of 0 degrees when the original microphone EM150-7P involved in the present invention is installed in the microphone tube provided by the present invention. DETAILED DESCRIPTION

[0030] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. 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.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] Reference Figures 1 to 5 This embodiment provides a square high-sensitivity microphone tube, comprising a square outer tube, a gain inner tube 2 built into the square outer tube, and a microphone 3 built into the gain inner tube 2;

[0033] The square outer tube includes an outer shell 11, a top cover 12 and a bottom cover 13. The top cover 12 is arranged at the top of the outer shell 11 and is clamped and fixed with the top of the outer shell 11. The bottom cover 13 is arranged at the bottom of the outer shell 11 and is clamped and fixed with the bottom of the outer shell 11. The outer shell 11 includes two sound intake planes, which are respectively a corresponding front sound intake plane 140 and a rear sound intake plane 141. The front sound intake plane 140 and the rear sound intake plane 141 are respectively fixed with a side net 15 with a porous structure for improving the uniformity and smoothness of airflow. A top sound hole is opened on the top of the top cover 12, and a top sound pipe net 16 with a porous structure for improving the uniformity and smoothness of airflow is fixed to the top sound hole.

[0034] The gain inner tube 2 includes a lower sound inlet tube 21 and an upper sound inlet tube 22 fixed to the top of the lower sound inlet tube 21. The upper sound inlet tube 22 and the lower sound inlet tube 21 are both hollow tubular structures. The inner wall of the lower sound inlet tube 21 is provided with a limiting inner boss 23 for clamping and fixing the microphone 3, and the outer wall of the lower sound inlet tube 21 is provided with a limiting outer boss 24 for clamping the top of the outer shell 11. At least one air inlet hole 25 is provided on the wall surface of the lower sound inlet tube 21, and a limiting concave ring 26 matching the limiting outer boss 24 is provided on the top of the outer shell 11.

[0035] It should be noted that the microphone 3 is placed in the gain inner tube 2, and the gain inner tube 2 is placed in the square outer tube, so that when the external sound enters the microphone 3, it must first pass through the sound inlet plane of the square outer tube, and undergo the first optimization processing through the side net 15 on the sound inlet plane, and then pass through the air inlet hole 25 of the lower sound inlet tube 21, and enter the microphone 3 from bottom to top; in another direction, the external sound first passes through the top sound hole of the square outer tube, and undergoes the first optimization processing through the top sound pipe net 16 on the top sound hole, and then passes through the upper sound inlet tube 22 with a hollow tubular structure, and enters the microphone 3 from top to bottom; the sound field in the square outer tube is optimized and improved from both the upper and lower directions, so that the entire sound field is improved, while the microphone sensitivity is improved, ensuring the sound restoration and quality.

[0036] In addition, an internal thread is provided inside the upper sound inlet tube 22, and an external thread corresponding to the internal thread of the upper sound inlet tube 22 is provided on the top of the lower sound inlet tube 21. The upper sound inlet tube 22 and the lower sound inlet tube 21 are connected by threads to be more tightly fastened. At the same time, the inner edge of the top opening of the upper sound inlet tube 22 is pressed and fixed to the microphone 3 after being tightened.

[0037] Reference Figures 4 to 5In this embodiment, the top-inlet sound pipe network 16 is in contact with the top of the upper sound pipe 22, which improves the stability of the top-inlet sound pipe network 16 during the sound transmission process; at the same time, since the distance between the top of the microphone 3 and the top-inlet sound pipe network 16 is one of the main factors affecting the performance of the microphone tube, if the distance between the top of the microphone 3 and the top-inlet sound pipe network 16 is too close, the high-frequency part will be compressed, and if the distance is too far, the reflected sound will be too small and the sound will not be full. It has been verified that the distance between the top of the microphone 3 fixed to the inner boss 23 and the top-inlet sound pipe network 16 is not less than 10 mm. The top of the microphone 3 and the top-inlet sound pipe network 16 directly form a good buffering area for high-frequency sounds, which can maximize the original characteristics of the microphone tube. Under this condition, the sensitivity of the effective part of the language segment (250-5000Hz) is improved, which suppresses the sensitivity of the high-frequency part of the microphone's frequency response outside the human voice range, effectively avoiding howling in the high-frequency part. The sensitivity of the low-frequency part of the microphone's frequency response is improved from 100Hz. The physical characteristics of the original microphone sensitivity make it easier for the microphone to pick up the low-frequency band of the sound source (such as appropriate reflected sound) when picking up sound, but there is attenuation below 50Hz, which can reduce the noise of sound pickup and improve the readability of the language segment.

[0038] Reference Figure 3 Preferably, the lower sound inlet pipe 21 is a circular tube structure, and the wall surface of the lower sound inlet pipe 21 is provided with six air inlet holes 25 evenly distributed along the circumference of the wall surface, and the air inlet holes 25 are oblong hole structures. It should be noted that, compared with the same square tube arranged inside the square outer tube, the gain effect will be better when the lower sound inlet pipe 21 is a circular tube structure, and at the same time, the six air inlet holes 25 evenly distributed circumferentially along the wall surface of the lower sound inlet pipe 21 can better ensure that no matter in which direction the user speaks, the sound can be transmitted to the microphone 3 more smoothly.

[0039] As a preferred solution, the total length of the air inlet 25 of the oblong hole structure is 24.4 mm, and the two ends are semicircles with a diameter of 4 mm. The diameter of the inner wall of the lower sound inlet tube 21 is 11 mm. The area of ​​the air inlet 25 of the lower sound inlet tube 21 and the volume of the chamber enclosed by the lower sound inlet tube 21 have a great influence on the microphone. It has been verified that when this microphone tube is matched with the original microphone EM150-7P, the use of the above parameters for design will achieve the best sound transmission effect. Of course, when matching with other microphones, changing the relevant dimensions accordingly according to this idea also falls within the protection scope of the present invention.

[0040] Reference Figure 1 to Figure 2In this embodiment, the housing 11 includes an upper housing 110 provided with a sound inlet plane and a lower housing 111 fixedly connected to the upper housing 110, and the lower housing 111 is fixed with a fixed mounting piece 112 for connecting to an external fixed base. The microphone tube is installed on a fixed base of different shapes and structures through the fixed mounting piece 112, and can be used in conference sites, remote video, broadcasting, recording, live broadcasting, and on-site sound reinforcement.

[0041] Preferably, a fixed connection belt 113 is provided between the upper shell 110 and the lower shell 111 , and the fixed connection belt 113 includes at least one LED light 114 , and the LED light is used to indicate different working states of the microphone tube, serving as a prompt.

[0042] The square high-sensitivity microphone tube of the above embodiment is used with the microphone EM150-7P, and the frequency response of the microphone EM150-7P itself is compared with the frequency response of the square high-sensitivity microphone tube installed in this embodiment. The test data shows that the square high-sensitivity microphone tube of this embodiment improves the microphone gain by 5.616dB, which means that the gain of the entire sound field is improved by nearly 2 times. What is more groundbreaking is that the frequency response curve of the original microphone EM150-7P is flattened in the effective part of the language segment (200-5000Hz), within a range of + / -2dB, which greatly reduces the pressure of the subsequent equipment to simulate sound feedback, ensures the sound restoration and quality, and saves the user some expenses of the subsequent equipment. The following is a comparison of different data:

[0043] 1. Frequency response of the original microphone EM150-7P

[0044] Reference Figure 6 and Figure 7 , Figure 6 The frequency response curve of the original microphone EM150-7P is shown in Figure 1. The dotted line is the frequency response curve measured when the original microphone is facing the sound source at a 0-degree angle, and the solid line is the frequency response curve measured when the original microphone is facing the sound source at a 180-degree angle. Figure 7 This is the sensitivity curve measured by the original microphone EM150-7P at an angle of 0 degrees.

[0045] The ratio of the forward sensitivity of the microphone EM150-7P at 0 degrees incident to the reverse sensitivity at 180 degrees incident from 400Hz to 5000Hz is 20dB at the maximum (2000Hz), but only 8dB at the minimum, with large fluctuations.

[0046] 2. Frequency response of the original microphone EM150-7P installed in the microphone tube of this embodiment

[0047] Reference Figure 8 and Fig. 9 , Figure 8: is a frequency response curve diagram of the original microphone EM150-7P installed in the microphone tube of this embodiment, wherein the dotted line is the frequency response curve measured when the original microphone is installed in the microphone tube in the positive direction facing the sound source at an angle of 0 degrees, and the solid line is the frequency response curve measured when the original microphone is installed in the microphone tube in the reverse direction facing the sound source at an angle of 180 degrees. Fig. 9 This is the sensitivity curve of the original microphone EM150-7P measured at an angle of 0 degrees when it is installed in the microphone tube.

[0048] The forward sensitivity at the entire 0-degree incident sound angle is increased by 5.616dB from -34.36dB of the original microphone EM150-7P to -28.744dB, and the sensitivity in the full frequency band of 100Hz-5000Hz can be increased by 5.616dB.

[0049] This shows that the microphone tube has done a good job in improving the sensitivity. Increasing the pickup sensitivity by 5.616dB means that when other conditions remain unchanged, the transmission gain of the entire sound field is nearly doubled compared to the original sound field.

[0050] The physical structure of the microphone tube also starts to attenuate from 5000Hz, attenuating the high-frequency band that is not needed for vocal amplification and delaying the howling in the high-frequency band.

[0051] Compared with the prior art, the present embodiment creatively arranges a gain inner tube 2 of a circular tubular structure in the square outer tube, optimizes and improves the sound field entering the microphone 3 built in the gain inner tube 2, reduces the influence of the square outer tube on the sound field, and only improves the sensitivity of the effective part of the language segment (250-5000Hz), suppresses the sensitivity of the high-frequency part of the frequency response of the microphone 3 outside the human voice range, effectively avoids the howling of the high-frequency part, and improves the physical characteristics of the original microphone sensitivity from 100Hz in the low-frequency part of the microphone frequency response, so that the microphone 3 is easier to pick up the low-frequency band of the sound source (such as appropriate reflected sound) when picking up sound, but there is attenuation below 50Hz, which can reduce the noise of picked up sound. The square high-sensitivity microphone tube in this embodiment achieves the following advantages after improving the overall sound intake airflow: simulating or delaying sound feedback, improving the signal-to-noise ratio of the system, increasing the number of microphones and saving the cost of subsequent equipment and improving the sound quality, improving the readability of the microphone, and having the characteristics of improving the sensitivity of the microphone and ensuring the sound restoration and quality.

[0052] Finally, it should be emphasized that the present invention is not limited to the above-mentioned implementation mode. The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A square high-sensitivity microphone tube, characterized in that: It comprises a square outer tube, a gain inner tube built in the square outer tube, and a microphone built in the gain inner tube; The square outer tube comprises an outer shell, a top cover and a bottom cover, wherein the top cover is arranged on the top of the outer shell and is fixedly connected with the top of the outer shell, the bottom cover is arranged on the bottom of the outer shell and is fixedly connected with the bottom of the outer shell, the outer shell comprises at least one sound inlet plane, the sound inlet plane is fixed with a side net of a porous structure for improving the uniformity and patency of airflow, and the top of the top cover is provided with a top-inlet sound hole, and the top-inlet sound hole is fixed with a top-inlet sound pipe net of a porous structure for improving the uniformity and patency of airflow; The gain inner tube comprises a lower sound inlet tube and an upper sound inlet tube fixed to the top of the lower sound inlet tube, the upper sound inlet tube and the lower sound inlet tube are both hollow tubular structures, the inner wall of the lower sound inlet tube is provided with a limiting inner boss for clamping and fixing the microphone, the outer wall of the lower sound inlet tube is provided with a limiting outer boss for clamping the top of the shell, at least one air inlet hole is provided on the wall surface of the lower sound inlet tube, and the top of the shell is provided with a limiting concave ring matched with the limiting outer boss; There are two sound intake planes, which are a corresponding front sound intake plane and a rear sound intake plane; The upper sound inlet pipe is provided with an internal thread inside, and the top of the lower sound inlet pipe is provided with an external thread corresponding to the internal thread of the upper sound inlet pipe.

2. A square high-sensitivity microphone tube as claimed in claim 1, characterized in that: The top-inlet sound pipe network is in contact with the top of the upper-inlet sound pipe.

3. A square high-sensitivity microphone tube as claimed in claim 2, characterized in that: The distance between the top of the microphone fixed to the inner limiting boss and the top-injected sound pipe network is not less than 10 mm.

4. A square high-sensitivity microphone tube as claimed in claim 3, characterized in that: The lower sound inlet pipe is a circular tubular structure.

5. A square high-sensitivity microphone tube as claimed in claim 4, characterized in that: The wall surface of the lower sound inlet pipe is provided with six air inlet holes evenly distributed along the circumference of the wall surface, and the air inlet holes are oblong hole structures.

6. A square high-sensitivity microphone tube as claimed in claim 5, characterized in that: The total length of the air inlet hole of the oblong hole structure is 24.4 mm, and both ends are semicircles with a diameter of 4 mm.

7. A square high-sensitivity microphone tube as claimed in any one of claims 1 to 6, characterized in that: The housing comprises an upper housing provided with a sound inlet plane and a lower housing fixedly connected to the upper housing, wherein the lower housing is fixed with a fixing installation sheet for connecting with an external fixing base.

8. A square high-sensitivity microphone tube as claimed in claim 7, characterized in that: A fixed connection belt is arranged between the upper shell and the lower shell, and the fixed connection belt includes at least one LED lamp.

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