Mesh cover fixing support and XY stereo pickup microphone

Abstract

The invention discloses a net cover fixing support suitable for an XY stereo pickup microphone and the XY stereo pickup microphone. The net cover fixing support suitable for the XY stereo pickup microphone comprises a bottom fixing base, a plurality of stand columns and a top fixing ring, the plurality of stand columns are the same in shape, the bottom ends of the plurality of stand columns are connected with the bottom fixing base, and the top ends of the plurality of stand columns are connected with the top fixing ring. The support column structure is arranged in the mesh enclosure fixing bracket, so that the lateral sound reflection of the microphone can be increased, and meanwhile, the backward incoming sound of the two sound heads is inhibited to a certain extent, so that the acoustic performance of the microphone can be improved. The mesh enclosure fixing support and the XY stereo pickup microphone also have the advantages of simple structure, easy assembly, strong external force impact resistance and the like.

Description

Technical Field

[0001] The invention relates to the field of acoustic equipment, in particular to a mesh cover fixing bracket suitable for an XY stereo sound pickup microphone and an XY stereo sound pickup microphone. Background Art

[0002] The XY stereo pickup microphone is a common stereo microphone used for recording. It uses two cardioid pickup microphones with an angle of 90 degrees between them and the positions of the microphones overlapping each other, such as Figure 1 As shown. One microphone points to the sound source, and the other microphone is perpendicular to it. This arrangement can provide more accurate sound positioning and stereoscopic effect, which is suitable for various recording scenarios, especially for recording music performances and sound effects. The XY stereo pickup system is relatively simple and practical, and is often used in the fields of field recording, TV broadcasting, music recording, etc. The existing XY stereo pickup microphone grille fixing bracket is as follows Figure 2A As shown, the mesh cover fixing bracket is combined with the mesh cover as shown in Figure 2B shown.

[0003] Existing XY stereo pickup microphones usually have problems such as phase distortion and unbalanced frequency response. Phase distortion refers to the phase distortion caused by the unreasonable position and layout of the microphone, which leads to inaccurate stereo image or phase interference. Unbalanced frequency response refers to the imbalance in the frequency response, that is, the response of some frequency bands is strong, while the response of other frequency bands is weak or inaccurate. Therefore, optimizing the frequency response and phase characteristics of stereo microphones is an important issue that needs to be considered in the process of designing stereo microphones. Summary of the invention

[0004] In view of this, the present invention proposes a mesh cover fixing bracket suitable for an XY stereo pickup microphone, and an XY stereo pickup microphone, which can solve the above existing technical problems. The present invention provides the following technical solutions:

[0005] A mesh cover fixing bracket suitable for an XY stereo pickup microphone comprises: a bottom fixing seat, a plurality of columns and a top fixing ring, wherein: the plurality of columns have the same shape, the bottom ends of the plurality of columns are connected to the bottom fixing seat, and the top ends of the plurality of columns are connected to the top fixing ring.

[0006] Optionally, the plurality of columns are perpendicular to the bottom fixing seat, and the plurality of columns are perpendicular to the top fixing ring.

[0007] Optionally, the height of the column is greater than 1 / 2 of the height of the mesh cover of the XY stereo pickup microphone.

[0008] Optionally, the number of the columns is 2 to 4.

[0009] Optionally, the bottom fixing seat includes: a bottom fixing outer ring and a bottom central piece, wherein: the bottom fixing outer ring is located at the periphery of the bottom central piece, the bottom of the bottom fixing outer ring and the bottom central piece are flush, the height of the bottom central piece is greater than the height of the bottom fixing outer ring, and the bottom central piece is shaped as a rotating body.

[0010] Optionally, the bottom central piece is a cylinder or a concave cone.

[0011] An XY stereo sound pickup microphone comprises: a high-position sound pickup microphone, a low-position sound pickup microphone, a mesh cover, and a mesh cover fixing bracket of the present invention, wherein: the top of the high-position sound pickup microphone and the top of the low-position sound pickup microphone are in contact with each other, and the placement direction of the high-position sound pickup microphone is perpendicular to the placement direction of the low-position sound pickup microphone; the mesh cover is arranged on the periphery of the high-position sound pickup microphone and the low-position sound pickup microphone; and the mesh cover fixing bracket is arranged on the outer surface of the mesh cover.

[0012] Optionally, the mesh shape of the mesh cover is circular or hexagonal, and the hollowing rate of the mesh cover is 40% to 60%.

[0013] Optionally, when the bottom fixing seat includes a bottom fixing outer ring and a bottom central piece, the bottom of the mesh cover is inserted between the bottom fixing outer ring and the bottom central piece.

[0014] Optionally, a sound absorbing material is attached to the inner surface of the mesh cover, and / or a sound absorbing material is attached to the outer surface of the bottom central piece.

[0015] According to the technical solution of the present invention, since the support structure is provided in the grille fixing bracket, the lateral sound reflection of the microphone can be increased, and the rearward sound of the two sound heads can be suppressed to a certain extent, thereby improving the acoustic performance of the microphone. The grille fixing bracket and the XY stereo pickup microphone also have the advantages of simple structure, easy assembly, strong resistance to external impact, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] For purposes of illustration and not limitation, the present invention will now be described in terms of preferred embodiments thereof, with particular reference to the accompanying drawings, in which:

[0017] Figure 1 It is a schematic diagram of the working principle of the existing XY stereo pickup microphone;

[0018] Figure 2A A schematic diagram of a mesh fixing bracket of an existing XY stereo pickup microphone;

[0019] Figure 2B for Figure 2A A physical picture of the combination of the grille fixing bracket and the grille is shown;

[0020] Figure 3A It is a schematic diagram of a mesh cover fixing bracket suitable for an XY stereo pickup microphone according to one embodiment of the present invention;

[0021] Figure 3B for Figure 3A A physical picture of the combination of the grille fixing bracket and the grille is shown;

[0022] Figure 4A It is a schematic diagram of a mesh cover fixing bracket applicable to an XY stereo pickup microphone according to a second embodiment of the present invention;

[0023] Figure 4B for Figure 4A A physical picture of the combination of the grille fixing bracket and the grille is shown;

[0024] Figure 5A It is a schematic diagram of a mesh cover fixing bracket applicable to an XY stereo pickup microphone according to a third embodiment of the present invention;

[0025] Figure 5B for Figure 5A A schematic cross-sectional view of the bottom center piece in the grille fixing bracket is shown.

[0026] In the figure:

[0027] 10. Existing mesh cover fixing bracket; 20. Mesh cover;

[0028] 110, first bottom fixing seat; 111, first bottom fixing outer ring; 112, first bottom central piece; 120, first column; 130, first top fixing ring;

[0029] 210, second bottom fixing seat; 211, second bottom fixing outer ring; 212, second bottom central piece; 220, second column; 230, second top fixing ring;

[0030] 310, third bottom fixing seat; 311, third bottom fixing outer ring; 312, bottom central piece; 320, third column; 330, third top fixing ring. DETAILED DESCRIPTION

[0031] 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.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms such as "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The top net support of the XY stereo pickup microphone has a hollow side panel, which facilitates lateral sound transmission and can improve the acoustic performance of the XY stereo pickup microphone.

[0034] The mesh cover fixing bracket suitable for an XY stereo pickup microphone according to an embodiment of the present invention comprises: a bottom fixing seat, a plurality of columns and a top fixing ring. The plurality of columns have the same shape, the bottom ends of the plurality of columns are connected to the bottom fixing seat, and the top ends of the plurality of columns are connected to the top fixing ring. Since the mesh cover fixing bracket is provided with a pillar structure, the lateral sound reflection of the microphone can be increased, and the rearward sound of the two sound heads can be suppressed to a certain extent, thereby improving the acoustic performance of the microphone. In addition, the pillar also enhances the mechanical stability, so that the mesh cover fixing bracket also has the advantages of simple structure, easy assembly, and strong resistance to external impact.

[0035] Preferably, the plurality of columns are perpendicular to the bottom fixing seat, and the plurality of columns are perpendicular to the top fixing ring. Compared with the solution of "the columns are not arranged vertically but extend obliquely", this design has better mechanical stability.

[0036] It is preferred that the height of the column is greater than 1 / 2 of the height of the mesh cover of the XY stereo pickup microphone. When the column is too short, on the one hand, it means that the increase in the lateral sound reflection of the microphone is not obvious, and the improvement in the acoustic performance is not obvious; on the other hand, it means that the distance between the bottom fixing seat and the top fixing ring is too close, in other words, the top fixing ring is relatively low, which means that the mesh cover above the plane where the top fixing ring is located lacks support and the mechanical stability is insufficient.

[0037] Too many pillars will block the side sound, so the number of pillars is preferably 2 to 4.

[0038] Figure 3A The two-pillar mesh cover fixing bracket is shown, and the mesh cover fixing bracket includes: a first bottom fixing seat 110, a first column 120, and a first top fixing ring 130. Among them: the first bottom fixing seat 110 includes a first bottom fixing outer ring 111 and a first bottom central piece 112; the number of the first columns 120 is 2; and the first bottom central piece 112 is cylindrical. Figure 3B for Figure 3A A physical picture of the two-pillar mesh fixing bracket and mesh combination is shown.

[0039] Figure 4A A four-pillar mesh cover fixing bracket is shown, which includes: a second bottom fixing seat 210, a second column 220, and a second top fixing ring 230. Among them: the second bottom fixing seat 210 includes a second bottom fixing outer ring 211 and a second bottom central piece 212; the number of second columns 220 is 4; and the second bottom central piece 212 is cylindrical. Figure 4B for Figure 4A A physical picture of the four-pillar mesh cover fixing bracket and the mesh cover combination is shown.

[0040] The bottom fixing seat may specifically include a bottom fixing outer ring and a bottom central piece. The bottom fixing outer ring is located at the periphery of the bottom central piece, the bottom fixing outer ring and the bottom of the bottom central piece are flush, and the height of the bottom central piece is greater than the height of the bottom fixing outer ring. The shape of the bottom central piece is a rotating body, specifically a cylinder (such as Figure 3A and Figure 4A shown) or a concave cone.

[0041] Figure 5A The concave cone-shaped mesh cover fixing bracket is shown, and the mesh cover fixing bracket includes: a third bottom fixing seat 310, a third column 320, and a third top fixing ring 330. Among them: the third bottom fixing seat 230 includes a third bottom fixing outer ring 311 and a third bottom central piece 312; the number of third columns 320 is 4; and the third bottom central piece 312 is a concave cone.

[0042] in, Figure 5B for Figure 5A The cross-sectional diagram of the bottom center piece 312 in the figure, the contour line of the cross-section conforms to the power law function curve, which can effectively control the reflection, absorption and scattering of sound and comprehensively improve the acoustic performance. This structure is also called a wedge structure. According to the analysis method of geometric acoustics, this structure is conducive to the sound wave to have a sound focusing effect or a sound diffusion effect: the concave surface forms a concentrated reflection on the sound wave, so that the reflected sound is focused on the side and bottom of the microphone structure, effectively transferring the sound energy to a designated area; the convex surface forms a diffuse reflection on the sound wave, preventing the reflected sound from concentrating in a certain area, effectively dispersing the sound energy and avoiding sound focusing. Power law curve formula: y = εx m , where the rotation center axis is the y-axis, the projection of the base radius is the x-axis, ε is the coefficient, and m is the power index. The specific values ​​can be: m=2, ε=1.

[0043] The XY stereo pickup microphone of the embodiment of the present invention comprises: a high-position pickup microphone, a low-position pickup microphone, a mesh cover, and a mesh cover fixing bracket of the embodiment of the present invention. Among them: the top of the high-position pickup microphone and the top of the low-position pickup microphone are in contact with each other, and the placement direction of the high-position pickup microphone is perpendicular to the placement direction of the low-position pickup microphone; the mesh cover is arranged on the periphery of the high-position pickup microphone and the low-position pickup microphone; the mesh cover fixing bracket is arranged on the outer surface of the mesh cover. Among them, when the bottom fixing seat includes a bottom fixed outer ring and a bottom central piece, the bottom of the mesh cover is inserted between the bottom fixed outer ring and the bottom central piece. Since the mesh cover fixing bracket in the XY stereo pickup microphone is provided with a pillar structure, the lateral sound reflection of the microphone can be increased, and the backward sound of the two sound heads can be suppressed to a certain extent, so that the acoustic performance of the microphone can be improved. In addition, the pillar also enhances the mechanical stability, so that the microphone also has the advantages of simple structure, easy assembly, and strong resistance to external impact.

[0044] The mesh shape of the grille can be circular or hexagonal, and the hollowing rate of the grille is 40% to 60%. The hollowing rate is the result of dividing the surface area of ​​the hollow part of the top grille bracket by the total surface area of ​​the bracket. If the hollowing rate is too small, it will be difficult to improve the side sound and reduce the side sound reflection, and the sound transmission effect will be poor; if the hollowing rate is too large, the mechanical strength is insufficient, and it is easy to be deformed or even damaged by force in the environment.

[0045] To further improve the product performance, the inner surface of the grille can be attached with sound absorbing material. In addition, the outer surface of the bottom center piece can be attached with sound absorbing material. This can increase the sound absorption capacity of the corresponding position, thereby improving the directional characteristics.

[0046] In order to enable those skilled in the art to better understand, the following is a detailed description in conjunction with experimental tests.

[0047] Experiment 1: Comparison experiment of XY stereo pickup microphones with mesh fixing brackets of different support types.

[0048] Put two high-position pickup microphones and low-position pickup microphones with basically the same performance into the same mesh cover, and then set them separately on the outer surface of the mesh cover: Figure 2AThe mesh cover fixing bracket without pillars shown in FIG. 3 , the mesh cover fixing bracket with two pillars shown in FIG. 4 , and the mesh cover fixing bracket with four pillars shown in FIG. Then the frequency response data of each sound head at the forward angle of 0°, 180°, and 135° were measured respectively, among which all the frequency response data with directivity were measured based on the acoustic axis of the sound head to be measured. According to the measurement results, it was verified that the shape of the mesh cover fixing bracket had a great influence on the frequency response consistency of the two sound heads: the reverse frequency response of the two sound heads was more consistent in the experimental case with the pillar structure compared with the experimental case without the pillar structure. In other words, the directivity difference of the two sound heads was greater in the case without the pillar. This may be because the pillar structure increases the lateral reflection of the reflected sound at the bottom. In addition, compared with the double pillars, the difference between the forward and reverse frequency responses of the mid-frequency of the four pillars increased by about 15dB to 20dB, and the directivity of the mid-frequency part was significantly enhanced, which may be because the pillar structure increased the lateral reflection while also suppressing the backward sound of the two sound heads to a certain extent.

[0049] Experiment 2: Comparison of XY stereo pickup microphones with different types of mesh covers.

[0050] The mesh diameters are 1.0mm and 1.5mm, and the mesh shapes are circular and hexagonal. Etched mesh models are made and assembled in the experimental mesh fixing bracket. Taking the low-position pickup unit as a reference, the frequency response data of the low-position pickup unit in different meshes at angles of 0°, 180°, and 135° with the sound head axis are measured and compared. It is found that: as the size of the mesh hole increases, the frequency response unevenness of the forward frequency response decreases, and the frequency response fluctuation of the high-frequency part above 10kHz decreases from 5dB to within 3dB; comparing the difference between the forward and reverse frequency responses, the frequency response difference in the 6kHz to 10kHz frequency band increases by about 3dB, that is, the directivity of the reverse in the mid-high frequency has been improved to a certain extent; comparing the difference between the forward and 135° frequency responses, the difference in the 500Hz to 2kHz frequency band and at 10kHz increases by about 5dB, that is, the directivity of the 135° mid-low frequency and high frequency has also been improved. Compared with the hexagonal holes in the mesh cover: the jitter of interference in the forward high frequency is reduced, the frequency response unevenness is smaller, and the frequency response fluctuation above 3kHz is reduced from 5dB to within 3dB; comparing the difference between the forward and reverse frequency responses, the frequency response difference in the 2kHz to 6kHz frequency band increases by about 3dB, and the difference at 10kHz increases by about 3dB, that is, the directivity of the reverse mid-frequency and high-frequency is improved to a certain extent; comparing the difference between the forward and 135° frequency responses, the difference at 1kHz and 6kHz increases by about 5dB, that is, the directivity of the 135° mid-frequency and high-frequency is also improved.

[0051] Experiment 3: Comparison experiment of XY stereo pickup microphones with and without sound-absorbing materials.

[0052] The control example uses a mesh fixing bracket as shown in Figure 5 that is not filled with sound absorbing material. The experimental example is filled with sound absorbing material based on the control example. The specific operations include: sticking sponge sheets around the inner wall of the mesh to reduce mesh reflection, and filling sponge on the outer edge of the cone of the bottom center piece to reduce cone and wall reflection. The frequency response data and comparison results show that the installation of sound absorbing material can improve high-frequency directivity to a certain extent.

[0053] Experiment 4: Comparison experiment of XY stereo pickup microphones with different shapes of bottom center pieces.

[0054] A microphone sample with a grille fixture having a cylindrical bottom center piece as shown in FIG4 is provided, and a microphone sample with a grille fixture having a concave cone bottom center piece as shown in FIG5 is provided. From the test comparison results, it can be verified that changing the cone shape to a concave shape can reduce the frequency response unevenness by about 3dB, and the difference between the forward and reverse frequency responses at 135° in the mid-low frequency range is improved by 5dB to 10dB.

[0055] From the above experiments, it can be seen that the acoustic performance of the XY stereo pickup microphone product can be optimized through structural improvement design and acoustic material filling, and the problems of frequency response imbalance, frequency response unevenness, directivity, etc. of the two pickup units can be improved in a targeted manner.

[0056] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A mesh cover fixing bracket suitable for an XY stereo pickup microphone, characterized in that: include: A bottom fixing seat, a plurality of columns and a top fixing ring, wherein: The plurality of columns have the same shape, the bottom ends of the plurality of columns are connected to the bottom fixing seat, and the top ends of the plurality of columns are connected to the top fixing ring.

2. The grille fixing bracket for an XY stereo pickup microphone according to claim 1, characterized in that: The plurality of columns are perpendicular to the bottom fixing seat, and the plurality of columns are perpendicular to the top fixing ring.

3. The grille fixing bracket for an XY stereo pickup microphone according to claim 2, characterized in that: The height of the column is greater than 1 / 2 of the height of the mesh cover of the XY stereo pickup microphone.

4. The grille fixing bracket for an XY stereo pickup microphone according to claim 1, characterized in that: The number of the columns is 2 to 4.

5. The grille fixing bracket for an XY stereo pickup microphone according to any one of claims 1 to 4, characterized in that: The bottom fixing seat comprises: a bottom fixing outer ring and a bottom central piece, wherein: The bottom fixed outer ring is located at the periphery of the bottom central piece, the bottom fixed outer ring is flush with the bottom of the bottom central piece, the height of the bottom central piece is greater than the height of the bottom fixed outer ring, and the bottom central piece is in the shape of a rotating body.

6. The grille fixing bracket for an XY stereo pickup microphone according to claim 5, characterized in that: The bottom central piece is a cylinder or a concave cone.

7. An XY stereo pickup microphone, characterized in that: include: A high-position pickup microphone, a low-position pickup microphone, a mesh cover, and a mesh cover fixing bracket according to any one of claims 1 to 6, wherein: The top of the high-position pickup microphone and the top of the low-position pickup microphone are in contact with each other, and the placement direction of the high-position pickup microphone and the placement direction of the low-position pickup microphone are perpendicular to each other; The mesh cover is arranged on the periphery of the high position pickup microphone and the low position pickup microphone; The mesh cover fixing bracket is arranged on the outer surface of the mesh cover.

8. The XY stereo pickup microphone according to claim 7, characterized in that: The mesh shape of the mesh cover is circular or hexagonal, and the hollowing rate of the mesh cover is 40% to 60%.

9. The XY stereo pickup microphone according to claim 7, characterized in that: When the bottom fixing seat comprises a bottom fixing outer ring and a bottom central piece, the bottom of the mesh cover is inserted between the bottom fixing outer ring and the bottom central piece.

10. The XY stereo pickup microphone according to claim 9, characterized in that: The inner surface of the mesh cover is affixed with a sound absorbing material, and / or the outer surface of the bottom central piece is affixed with a sound absorbing material.

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