Microphone structure and preparation method thereof

Abstract

The invention provides a microphone structure and a preparation method thereof. The microphone structure comprises a standard microphone and a three-dimensional elliptical sphere structure, the three-dimensional oval sphere structure comprises an oval sphere cavity and a cylinder neck. And the elliptical spherical cavity is packaged with a standard microphone through the cylindrical neck to form a microphone structure. According to the microphone structure, a microphone sensitivity enhancing system is formed through the structural design of the microphone structure, the capacity of capturing weak sound signals can be remarkably improved, and high recording definition can be kept even at a long distance. The sound captured by the microphone structure can maintain a high signal-to-noise ratio in a noise environment, thereby obtaining a purer audio frequency. In view of the advantages of the microphone structure, the microphone can be applied to application scenes such as large-scale conference room conference recording, long-distance outdoor sound acquisition and sound monitoring of safety departments.

Description

Technical Field

[0001] The present invention belongs to the technical field of acoustic signal processing, and in particular relates to a microphone structure and a preparation method thereof. Background Art

[0002] Ordinary microphones have limitations in design and performance, which can affect their performance in certain scenarios. For example, due to their low sensitivity, traditional microphones cannot capture clear sound when collecting sound from a long distance. Especially in noisy environments, they often have difficulty effectively distinguishing the target sound from background noise, resulting in reduced recording quality. Summary of the invention

[0003] In view of this, the present invention aims to overcome the deficiencies of the above-mentioned problems in the prior art, and proposes a microphone structure and a preparation method thereof to solve the problem in the prior art that the sound source signal is weak and it is difficult for the receiving end to receive effective information.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A first aspect of the present invention provides a microphone structure, comprising:

[0006] Standard microphone and three-dimensional ellipsoidal sphere structure;

[0007] The three-dimensional ellipsoidal spherical structure comprises an ellipsoidal spherical cavity and a cylindrical neck;

[0008] The elliptical spherical cavity forms a microphone structure through a cylindrical neck and a standard microphone package.

[0009] Furthermore, the elliptical spherical cavity has an outer shell made of plastic material, and the inside and outside of the outer shell are evenly coated with a metal aluminum film, so that the outer shell is packaged into an elliptical sphere to form a cavity.

[0010] Furthermore, the thickness of the metal aluminum film coating is 20 microns.

[0011] Furthermore, the cylindrical neck is made of plastic material.

[0012] Furthermore, the height of the cylindrical neck is 10 mm and the radius is 2 mm.

[0013] Furthermore, the upper part of the elliptical spherical cavity is a sphere with a diameter of 10 mm, the lower part is a cone with a height of 15 mm, and the generatrix angle is 30°.

[0014] A second aspect of the present invention provides a method for preparing a microphone structure, comprising:

[0015] Making an elliptical spherical cavity: making an elliptical shell, evenly applying a layer of metal aluminum film on the inner and outer surfaces of the shell, and encapsulating the shell coated with the metal aluminum film into a sphere to form a cavity;

[0016] Make the cylindrical neck;

[0017] Select microphone;

[0018] The opening of the elliptical spherical cavity is sealed with one end of the cylindrical neck, and the selected microphone is embedded in the other end of the cylindrical neck to complete the production of the microphone structure;

[0019] Perform performance tests on microphone structures.

[0020] Compared with the prior art, the microphone structure and the preparation method thereof described in the present invention have the following advantages:

[0021] The present invention can enhance the sound signal received by the microphone by using a three-dimensional elliptical sphere structure covered with metal aluminum at the receiving end. The structure designed by the present invention can capture and focus sound energy, improve the amplitude of the sound signal and the sensitivity of the microphone.

[0022] The present invention utilizes the reflection and focusing characteristics of sound and combines the acoustic properties of materials to greatly improve the performance and reliability of the sound transmission system.

[0023] The present invention can be applied to the following application scenarios, such as recording meetings in large conference rooms, collecting long-distance sounds outdoors, and monitoring sounds by security departments, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a schematic diagram of the structure of the microphone of the present invention;

[0026] Figure 2 This is a structural specification diagram of the microphone of the present invention;

[0027] Figure 3 A top view of the microphone structure of the present invention;

[0028] Figure 4 It is a schematic diagram of the RMS comparison results of the standard microphone of the present invention and the microphone structure receiving the same sound.

[0029] Description of Reference Numerals

[0030] 1-Elliptical spherical cavity; 2-Cylindrical neck; 3-Standard microphone. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying 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 the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 it can be indirectly connected 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 by specific circumstances.

[0034] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0035] Embodiment 1:

[0036] like Figure 1-3 As shown, the present invention provides a microphone structure, comprising:

[0037] Standard microphone and three-dimensional ellipsoidal sphere structure;

[0038] The three-dimensional ellipsoidal spherical structure comprises an ellipsoidal spherical cavity and a cylindrical neck;

[0039] The elliptical spherical cavity forms a microphone structure through a cylindrical neck and a standard microphone package.

[0040] Specifically, the elliptical spherical cavity is made of a plastic material shell, and the inside and outside of the shell are evenly coated with a metal aluminum film, and the shell is packaged into an elliptical sphere to form a cavity.

[0041] Specifically, the thickness of the metal aluminum film coating is 20 microns.

[0042] Specifically, the cylindrical neck is made of plastic material.

[0043] Specifically, the height of the cylindrical neck is 10 mm and the radius is 2 mm.

[0044] Specifically, the upper part of the elliptical spherical cavity is a sphere with a diameter of 10 mm, the lower part is a cone with a height of 15 mm, and the generatrix angle is 30°.

[0045] The microphone structure of the present invention is composed of an elliptical spherical cavity coated with metal aluminum through a cylindrical neck and a standard microphone package, and the external material of the elliptical spherical cavity is attached with a metal aluminum film. The core of the structural design of the present invention is: before the receiving microphone receives the sound signal, the sound signal will first pass through the three-dimensional elliptical spherical structure. Since the sphere is coated with metal aluminum, it has good sound absorption performance, and the energy loss of the sound signal when it is transmitted from the outside to the inside of the three-dimensional elliptical spherical structure is almost zero. Due to this special structure, the sound signal will continue to be transmitted to the cylindrical neck after reaching the inside of the elliptical spherical cavity, and the structure inside the cylindrical neck will cause the sound signal to be initially reflected and enhanced. The Pascal effect shows that the pressure generated by sound vibration will be evenly transmitted to the inside of the elliptical spherical cavity; in addition, due to the influence of the Helmholtz resonance principle, the sound enhancement phenomenon will occur when the sound signal inside the system structure matches the natural inherent resonance frequency of the space. The Pascal effect and the Helmholtz resonance principle make the sound pressure received in the neck of the cylinder much greater than the sound pressure of the sound source signal, which in turn makes the sound signal energy received by the microphone much greater than the signal emitted by the sound source.

[0046] like Figure 4 The figure shows the RMS comparison results of the same sound received by a standard microphone and the microphone structure of the present invention. The sound source is a 30-second white noise, and the distance between the sound source and the microphone is about 30 centimeters. According to the results of 25 measurements, the speech enhancement performance of the microphone structure of the present invention is about 3 times that of the standard microphone. After actual measurement, when the microphone is about 1 meter away from the sound source, the speech enhancement performance of the microphone structure of the present invention is still about 3 times that of the standard microphone.

[0047] Embodiment 2:

[0048] A method for preparing a microphone structure:

[0049] Step 1: Elliptical shell structure design

[0050] 1. Elliptical spherical cavity structure design: Design an elliptical outer body, which is made of plastic material. The geometry of the outer shell can effectively capture the sound and guide it to the microphone element inside.

[0051] 2. Metal aluminum film coating: A layer of metal aluminum film with a thickness of about 20 microns is evenly applied on the outer surface of the exterior.

[0052] Step 2: Design and manufacture of cylindrical neck

[0053] 1. The material of the cylinder neck is also plastic, which is consistent with the shell material, to facilitate subsequent connection.

[0054] 2. Size selection: The height of the cylinder neck is set to 10 mm and the radius is 2 mm.

[0055] Step 3: Microphone selection and parameter confirmation

[0056] The dimensions of the microphone are 5 mm in diameter (with an allowable error of ±0.1 mm) and 3 mm in height (with an allowable error of ±0.2 mm) to ensure that it can be embedded in the neck of the cylinder.

[0057] The operating voltage range of the microphone is 1-10V DC, the reference operating voltage is 3.3V DC, the impedance is 3kΩ, the operating frequency is 20-16000Hz, the maximum current consumption is 0.5mA, the offset voltage characteristic is -3dB, the sensitivity is -40±2dB, and the directivity is omnidirectional.

[0058] Step 4: MSES system assembly

[0059] 1. Elliptical shell and cylindrical neck packaging: After the elliptical shell and cylindrical cavity are manufactured according to the above specifications, the opening of the elliptical shell is connected to one end of the cylindrical cavity and sent to the workshop for 3D printing.

[0060] 2. Microphone embedding: embed the selected microphone into the other end of the cylindrical neck, thus completing the microphone structure.

[0061] Step 5: Overall testing and optimization

[0062] 1. Performance evaluation: A comprehensive performance test was conducted on the microphone structure that was manufactured. According to actual measurements, when the microphone was about 1 meter away from the sound source, the speech enhancement performance of the microphone structure of the present invention was about 3 times better than that of a standard microphone.

[0063] 2. Application verification: The microphone structure is applied to actual scenarios, such as meeting recording, long-distance sound collection, sound monitoring, etc., and it has been verified that it is reliable in actual applications.

[0064] Through the specific implementation of the above steps, the present invention can achieve a significant improvement in the sensitivity of the microphone at the receiving end of the traditional acoustic transmission system, and provide a more reliable and effective solution for receiving and processing sound signals.

[0065] The above description 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A microphone structure, characterized in that: include: Standard microphone and three-dimensional ellipsoidal sphere structure; The three-dimensional ellipsoidal spherical structure comprises an ellipsoidal spherical cavity and a cylindrical neck; The elliptical spherical cavity forms a microphone structure through a cylindrical neck and a standard microphone package.

2. A microphone structure according to claim 1, characterized in that: The elliptical spherical cavity is made of a plastic material shell, and the inside and outside of the shell are evenly coated with a metal aluminum film, so that the shell is packaged into an elliptical sphere to form a cavity.

3. A microphone structure according to claim 2, characterized in that: The thickness of the metal aluminum film coating is 20 microns.

4. The microphone structure according to claim 1, characterized in that: The cylindrical neck is made of plastic material.

5. A microphone structure according to claim 4, characterized in that: The cylinder neck has a height of 10 mm and a radius of 2 mm.

6. The microphone structure according to claim 1, characterized in that: The upper part of the elliptical spherical cavity is a sphere with a diameter of 10 mm, the lower part is a cone with a height of 15 mm, and the generatrix angle is 30°.

7. A method for preparing a microphone structure, characterized in that: include: Making an elliptical spherical cavity: making an elliptical shell, evenly applying a layer of metal aluminum film on the inner and outer surfaces of the shell, and encapsulating the shell coated with the metal aluminum film into a sphere to form a cavity; Make the cylindrical neck; Select microphone; The opening of the elliptical spherical cavity is sealed with one end of the cylindrical neck, and the selected microphone is embedded in the other end of the cylindrical neck to complete the production of the microphone structure; Perform performance tests on microphone structures.

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