Noise reduction device based on pickup microphone

Abstract

The embodiment of the utility model discloses a noise reduction device based on a pickup microphone. Comprising a pickup microphone used for collecting voice simulation signals of human voice and environmental noise; the pickup microphone is connected with the AD conversion module, and the AD conversion module is used for converting a collected sound analog signal into a sound digital signal; the AD conversion module is connected with a noise reduction processing module, and the noise reduction processing module is used for removing environmental noise digital signals in the sound digital signals; the noise reduction processing module is connected with a loudspeaker, and the loudspeaker is used for outputting an identified human voice signal; wherein the pickup microphone is provided with a vibrating diaphragm, the top and the bottom of the pickup microphone are provided with a first pickup hole and a second pickup hole, and the center line of the vibrating diaphragm coincides with the center line of the first pickup hole and the center line of the second pickup hole. The beneficial effects are that through the arrangement of the noise reduction processing module, the environment noise signals in the collected sound signals can be eliminated.

Description

Technical Field

[0001] This utility model relates to the field of sound noise reduction technology, and in particular to a noise reduction device based on a microphone. Background Technology

[0002] Currently, there are many noise reduction methods in the field of sound noise reduction, such as the traditional microphone array noise reduction technology. This technology relies on multiple microphones forming an array and uses principles such as beamforming to process sound signals. It suppresses noise and enhances the target sound (such as human voice) by adjusting parameters such as the phase and amplitude of the sound signals collected by each microphone. However, this technology is not very effective when dealing with complex, sudden, and non-steady-state noise in everyday scenarios, resulting in the final output sound still containing significant noise interference.

[0003] Furthermore, the microphones used in existing noise reduction devices typically have only one opening, which prevents them from directional sound acquisition.

[0004] Based on this, the present utility model is proposed. Utility Model Content

[0005] This utility model provides a noise reduction device based on a microphone to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a noise reduction device based on a microphone, comprising:

[0007] A microphone used to collect analog sound signals of human voice and ambient noise;

[0008] The microphone is connected to an AD conversion module, which is used to convert the acquired analog sound signal into a digital sound signal.

[0009] The AD conversion module is connected to the noise reduction processing module, which is used to remove environmental noise digital signals from the audio digital signal.

[0010] The noise reduction module is connected to a speaker, which is used to output the recognized human voice signal.

[0011] The microphone is equipped with a diaphragm, and a first pickup hole and a second pickup hole are provided at the top and bottom of the microphone. The center line of the diaphragm coincides with the center lines of the first pickup hole and the second pickup hole.

[0012] In an optional embodiment, the first pickup hole and the second pickup hole are located on both sides of the diaphragm, and the distance between the first pickup hole, the second pickup hole and the diaphragm is equal.

[0013] In an optional embodiment, the radius of the first pickup hole is equal to the radius of the second pickup hole.

[0014] In an optional embodiment, the microphone is a MEMS microphone.

[0015] In an optional embodiment, the noise reduction processing module includes a DSP, an MCU, and a storage unit.

[0016] In summary, this utility model embodiment provides a noise reduction device based on a microphone, which has significant advantages over traditional noise reduction technologies. The microphone uses a first and a second pickup hole on both sides of the diaphragm. When a sound signal comes from above or below (0° or 180°), it is collected normally. When a sound signal comes from the left or right (90° or 270°), the sound is split into two paths, reaching the diaphragm simultaneously from the top and bottom holes. At this point, the two identical sound signals are superimposed and at least partially canceled out. This microphone is highly sensitive to sound signals in the 0° and 180° directions, achieving approximate directional sound acquisition. Furthermore, by incorporating a noise reduction processing module, environmental noise signals in the collected sound signal can be eliminated. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a noise reduction device based on a microphone provided in an embodiment of this utility model;

[0019] Figure 2 This is a schematic diagram of the appearance of a noise reduction device based on a microphone provided in an embodiment of this utility model;

[0020] Figure 3 This is a schematic diagram of the noise reduction processing module provided in this embodiment of the utility model.

[0021] Figure 4 This is a schematic diagram of the structure of the directional microphone provided in this embodiment of the utility model. Figure 1 .

[0022] Figure 5 This is a schematic diagram of the structure of the directional microphone provided in this embodiment of the utility model. Figure 2 .

[0023] The attached figures are labeled as follows:

[0024] 1-Diaphragm, 2-First pickup hole, 3-Second pickup hole. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] See appendix Figure 1-5 The purpose of this embodiment is to provide a noise reduction device based on a microphone, comprising: a microphone for collecting analog sound signals of human voice and environmental noise; the microphone being connected to an AD conversion module for converting the collected analog sound signals into digital sound signals; the AD conversion module being connected to a noise reduction processing module for removing environmental noise digital signals from the digital sound signals; and the noise reduction processing module being connected to a speaker for outputting the recognized human voice signals.

[0029] It should be noted that the microphone is a MEMS microphone, and it is equipped with a diaphragm 1. A first pickup hole 2 and a second pickup hole 3 are located at the top and bottom of the microphone. The centerline of the diaphragm 1 coincides with the centerlines of the first pickup hole 2 and the second pickup hole 3. The first pickup hole 2 and the second pickup hole 3 are located on opposite sides of the diaphragm 1, and the distances between the first pickup hole 2, the second pickup hole 3, and the diaphragm 1 are equal. The radius of the first pickup hole 2 is equal to the radius of the second pickup hole 3.

[0030] Regarding the above structure of the microphone, please refer to the appendix. Figure 4 Normal acquisition occurs when the sound signal comes from above or below, i.e., 0° or 180°; see appendix. Figure 5 When a sound signal comes from the left or right, that is, 90° or 270°, the sound is split into two paths, reaching the diaphragm 1 simultaneously through the top and bottom holes. At this point, the two identical sound signals are superimposed and at least partially canceled out. This microphone is sensitive to sound signals in the 0° and 180° directions, achieving approximate directional sound acquisition.

[0031] Furthermore, the noise reduction processing module includes a DSP, an MCU, and a storage unit. In an optional embodiment, the noise reduction processing module includes a DSP, an MCU, and a storage unit. The DSP has high computing power but insufficient storage space, while the MCU has lower computing power. Therefore, the noise reduction model is stored in the MCU. During actual operation, the DSP retrieves the noise reduction model from the MCU for calculation. It should be noted that the noise reduction model uses a noise reduction model from the prior art. The noise reduction model has many parameters. Since the MCU's internal flash memory is prone to errors during read / write operations, these parameters are stored in the storage unit. By setting up the noise reduction processing module, environmental noise signals in the collected sound signal can be eliminated. In this embodiment, a high-fidelity speaker is used, which has a wide frequency response range and can accurately reproduce the sound quality of the human voice signal.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of this utility model.

Claims

1. A noise reduction device based on a microphone, characterized in that, include: A microphone used to collect analog sound signals of human voice and ambient noise; The microphone is connected to an AD conversion module, which is used to convert the acquired analog sound signal into a digital sound signal. The AD conversion module is connected to the noise reduction processing module, which is used to remove environmental noise digital signals from the audio digital signal. The noise reduction module is connected to a speaker, which is used to output the recognized human voice signal. The microphone is provided with a diaphragm (1), and the top and bottom of the microphone are provided with a first pickup hole (2) and a second pickup hole (3). The center line of the diaphragm (1) coincides with the center lines of the first pickup hole (2) and the second pickup hole (3).

2. The noise reduction device based on a microphone according to claim 1, characterized in that, The first pickup hole (2) and the second pickup hole (3) are located on both sides of the diaphragm (1), and the distance between the first pickup hole (2), the second pickup hole (3) and the diaphragm (1) is equal.

3. The noise reduction device based on a microphone according to claim 1, characterized in that, The radius of the first pickup hole (2) is equal to the radius of the second pickup hole (3).

4. The noise reduction device based on a microphone according to claim 1, characterized in that, The microphone used for pickup is a MEMS microphone.

5. The noise reduction device based on a microphone according to claim 1, characterized in that, The noise reduction processing module includes a DSP, an MCU, and a storage unit.

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