A microphone for classroom use

Abstract

This utility model relates to the field of audio acquisition equipment technology and discloses a microphone for classrooms, including a microphone body comprising a housing. This microphone for classrooms constructs a highly efficient dual noise reduction system by incorporating a noise-reducing cover and composite sound-absorbing cotton. The noise-reducing cover tightly wraps around the housing, utilizing its material properties to block most external environmental noise, such as noise from outside the window and footsteps outside the classroom. The composite sound-absorbing cotton, filled between the housing and the noise-reducing cover, further absorbs residual noise penetrating the cover while reducing noise generated by vibrations of internal components. This design allows the microphone to effectively filter out non-target sounds in complex classroom environments, significantly improving the clarity of target sounds such as teachers lecturing and students answering questions. It avoids the audio blurring problem caused by noise interference in traditional microphones, providing higher-quality sound materials for classroom recording, remote teaching, and other scenarios.

Description

Technical Field

[0001] This utility model relates to the field of audio acquisition equipment technology, specifically a microphone for use in a classroom. Background Technology

[0002] In modern teaching, microphones are widely used in classroom recording, live streaming of remote teaching, and other scenarios.

[0003] The existing patent document CN221842653U discloses a microphone for classrooms. This utility model uses the classroom ceiling to fix the Y-axis movement mechanism, thereby allowing the microphone body to move along the Y, X, and Z axes in cooperation with the Y-axis, X, and Z-axis movement mechanisms. In addition, the face recognition device can monitor the teacher's face in real time, making it convenient for the microphone body to follow the teacher's movement, thus better recording the teacher's voice and improving the recording quality.

[0004] However, existing microphones used in classrooms are not suitable for building an efficient dual noise reduction system. Existing microphones do not have a noise reduction cover that tightly wraps the shell, so they cannot use the material properties to block most of the external environmental noise, such as noise from outside the window and footsteps outside the classroom. In addition, the outside of the shell is not filled with composite sound-absorbing cotton, so it cannot further absorb the residual noise that penetrates, nor can it reduce the noise generated by the vibration of the internal components. Therefore, in the complex classroom environment, it is difficult to effectively filter non-target sounds, and the improvement in the clarity of target sounds such as teachers' lectures and students' answers to questions is limited. It is easy to have audio blurring problems caused by noise interference, which makes it difficult to meet the needs of high-quality sound materials in scenarios such as classroom recording and remote teaching. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] The purpose of this invention is to provide a microphone for classrooms, in order to solve the problem mentioned in the background art that existing microphones for classrooms are not convenient for building an efficient dual noise reduction system.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a microphone for classrooms, comprising a microphone body, the microphone body including a housing, a noise reduction cover fitted on the outer side of the housing, composite sound-absorbing cotton filled between the housing and the noise reduction cover, a signal processing module integrated inside the housing, a microphone embedded on one side of the housing, and the microphone and the signal processing module forming an electrical connection.

[0009] As a further improvement to the above solution, an inverted U-shaped mounting base is fitted on the outer side of the microphone body, and an adjustment motor is installed on the vertical section of one side of the inverted U-shaped mounting base. The transmission end of the adjustment motor passes through the side wall of the inverted U-shaped mounting base and is rigidly connected to the microphone body.

[0010] As a further improvement to the above solution, a connecting rod extends horizontally from the side of the microphone body away from the adjusting motor, and a connecting plate is correspondingly provided on the inner side of the other vertical section of the inverted U-shaped mounting base. The connecting rod and the connecting plate form a rotating fit structure.

[0011] As a further improvement to the above solution, mounting plates extend symmetrically from the top ends of both sides of the inverted U-shaped mounting base, and mounting holes for fixing are provided on the mounting plates.

[0012] As a further improvement to the above solution, a heat dissipation groove is provided on the side of the microphone body away from the microphone. At the corresponding position of the heat dissipation groove, both the noise reduction cover and the composite sound-absorbing cotton adopt a ring-shaped hollow design.

[0013] As a further improvement to the above solution, the annular hollow area of ​​the noise reduction cover is covered with an acoustic filter, and symmetrically distributed pickup holes are opened on the other side of the noise reduction cover. The microphone is embedded inside the pickup hole, and a thin layer of sound-absorbing cotton is pasted on the inner wall of the pickup hole.

[0014] As a further improvement to the above solution, the signal processing module includes a preamplifier, a filter, and an A / D converter. The preamplifier is electrically connected to the microphone, the filter is connected to the output of the preamplifier, and the A / D converter is connected to the output of the filter.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This microphone for classrooms utilizes a noise-reducing cover and composite sound-absorbing cotton to create a highly efficient dual noise reduction system. The noise-reducing cover tightly wraps around the shell, using its material properties to block most of the external environmental noise, such as noise from outside the window and footsteps outside the classroom. The composite sound-absorbing cotton is filled between the shell and the noise-reducing cover, which can further absorb residual noise that penetrates the noise-reducing cover, while also reducing noise generated by the vibration of internal components. This design allows the microphone to effectively filter out non-target sounds in complex classroom environments, significantly improving the clarity of target sounds such as teachers' lectures and students' answers to questions. It avoids the audio blurring problem caused by noise interference in traditional microphones, providing higher quality sound materials for classroom recording, remote teaching, and other scenarios.

[0017] 2. This microphone for classrooms features symmetrically distributed pickup holes on a noise-reducing cover, with the microphone precisely embedded inside each hole. Thin sound-absorbing cotton is then attached to the hole walls, creating a unique acoustic structure. This design ensures efficient transmission of the target sound to the microphone while the sound-absorbing cotton reduces sound wave reflection interference on the hole walls, significantly improving speech clarity. The special layout of the pickup holes combined with the sound-absorbing material effectively suppresses environmental noise, such as air conditioning operation and students turning pages, resulting in cleaner teacher speech and providing a clear audio foundation for classroom recording and remote teaching.

[0018] 3. This microphone for classrooms adopts a design that uses an adjustable motor to drive the microphone body to rotate around a coordinated structure, which enables flexible adjustment of the pickup angle. Teachers can dynamically adjust the pickup direction according to the classroom layout and teaching needs. Whether it is teaching in the front row of a tiered classroom or interactive scenarios in a roundtable discussion area, the best sound collection effect can be obtained. This multi-angle adjustment function expands the microphone's coverage range, ensuring accurate capture of sound signals in different teaching scenarios, and improving the applicability and flexibility of the equipment.

[0019] 4. This microphone for classrooms features an innovative design that combines heat dissipation and noise reduction. At the corresponding location of the heat dissipation slot, a ring-shaped hollow design of noise reduction cover and composite sound-absorbing cotton is used, which is covered with an acoustic filter. This forms a special structure that prioritizes heat channels and allows sound waves to bypass them. This design not only ensures effective heat dissipation inside the device and reduces the risk of performance degradation due to high temperature, but also minimizes the loss of noise reduction performance by attenuating the sound waves reflected from the heat dissipation holes through the acoustic filter. This structure allows the device to work stably in high-temperature environments while maintaining good noise reduction effect.

[0020] 5. This microphone for classrooms features a three-stage cascaded signal processing module that integrates a preamplifier, filter, and A / D converter. The preamplifier uses a low-noise operational amplifier, effectively reducing noise interference during signal amplification. The filter integrates power frequency notch filtering and voice enhancement bands, specifically filtering out power supply interference and enhancing the voice signal. The A / D converter supports high-precision sampling, accurately capturing subtle changes in sound. This modular design significantly improves the quality of the output signal, resulting in a wider frequency response range and higher sound quality reproduction, providing excellent audio support for remote teaching and classroom recording.

[0021] 6. This microphone for classrooms features an inverted U-shaped mounting base design that balances ease of installation with structural stability. The mounting holes on both sides allow for quick ceiling or wall mounting, simplifying the installation process. Simultaneously, the rigid connection of the adjusting motor and the rotating support of the connecting rod create a stable structure that effectively resists external vibrations, such as swaying caused by air conditioning airflow or slight wall vibrations. This design ensures the stability of the equipment during long-term use, reduces noise caused by mechanical vibration, and extends the equipment's lifespan. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0023] Figure 2 This is a three-dimensional structural diagram of the microphone body of this utility model;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the composite sound-absorbing cotton of this utility model;

[0025] Figure 4 This is a schematic diagram of the frame structure of this utility model.

[0026] In the diagram: 1. Microphone body; 2. Housing; 3. Noise reduction cover; 4. Composite sound-absorbing cotton; 5. Signal processing module; 6. Microphone; 7. Inverted U-shaped mounting base; 8. Adjustment motor; 9. Connecting rod; 10. Connecting plate; 11. Mounting plate; 12. Mounting hole; 13. Heat dissipation groove; 14. Acoustic filter; 15. Sound pickup hole; 16. Thin sound-absorbing cotton; 17. Preamplifier; 18. Filter; 19. A / D converter. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1 - Figure 4 This utility model provides a technical solution: a microphone for classrooms, including a microphone body 1, the microphone body 1 including a shell 2, a noise reduction cover 3 is fitted on the outside of the shell 2, composite sound-absorbing cotton 4 is filled between the shell 2 and the noise reduction cover 3, a signal processing module 5 is integrated inside the shell 2, a microphone 6 is embedded on one side of the shell 2, and the microphone 6 is electrically connected to the signal processing module 5.

[0029] The dual noise reduction structure formed by the noise reduction cover 3 and the composite sound-absorbing cotton 4 will block and absorb the interference noise in the surrounding environment (such as noise from outside the window, equipment operation noise, etc.), further highlighting the target sound. The sound signal collected by the microphone 6 will be transmitted to the signal processing module 5 inside the housing 2. The composite sound-absorbing cotton 4 between the housing 2 and the noise reduction cover 3 can also reduce the noise generated by the vibration of the internal components of the housing 2. Together with the noise reduction cover 3, they form multiple barriers to continuously block external environmental noise and ensure that the microphone maintains a high-quality sound pickup effect in the complex classroom environment.

[0030] The outer side of the microphone body 1 is fitted with an inverted U-shaped mounting base 7. An adjustment motor 8 is installed on the vertical section of one side of the inverted U-shaped mounting base 7. The transmission end of the adjustment motor 8 passes through the side wall of the inverted U-shaped mounting base 7 and is rigidly connected to the microphone body 1. A connecting rod 9 extends horizontally from the side of the microphone body 1 away from the adjustment motor 8. A connecting plate 10 is correspondingly provided on the inner side of the other vertical section of the inverted U-shaped mounting base 7. The connecting rod 9 and the connecting plate 10 form a rotating fit structure. Mounting plates 11 extend symmetrically from the top of both sides of the inverted U-shaped mounting base 7. Mounting holes 12 for fixing are provided on the mounting plates 11.

[0031] During installation, the microphone can be securely fixed to a suitable location such as the classroom ceiling or wall using bolts and other connectors via the mounting holes 12 on the mounting plates 11 on both sides of the inverted U-shaped mounting base 7. This ensures the overall installation of the equipment is firm and avoids vibration affecting the sound pickup stability. When in use, the adjustment motor 8 is started, and its transmission end drives the microphone body 1 to rotate flexibly around the rotational cooperation structure of the connecting rod 9 and the connecting plate 10, achieving precise adjustment of the sound pickup angle within a certain range. During this process, the connecting rod 9 rotates smoothly within the connecting plate 10, providing stable support for the angle adjustment of the microphone body 1, thereby ensuring that the microphone 6 can be accurately aimed at the teacher's teaching position or the student's speaking area, improving the capture efficiency of the target sound.

[0032] A heat dissipation groove 13 is provided on the side of the microphone body 1 away from the microphone 6. At the corresponding position of the heat dissipation groove 13, the noise reduction cover 3 and the composite sound-absorbing cotton 4 are both designed with a ring-shaped hollow. The ring-shaped hollow of the noise reduction cover 3 is covered with an acoustic filter 14. Symmetrically distributed pickup holes 15 are provided on the other side of the noise reduction cover 3. The microphone 6 is embedded in the pickup hole 15, and a thin layer of sound-absorbing cotton 16 is pasted on the inner wall of the pickup hole 15. The signal processing module 5 includes a preamplifier 17, a filter 18 and an A / D converter 19. The preamplifier 17 is electrically connected to the microphone 6. The filter 18 is connected to the output terminal of the preamplifier 17. The A / D converter 19 is connected to the output terminal of the filter 18.

[0033] When a teacher lectures or a student answers a question, the sound enters through the symmetrically distributed pickup holes 15 on the noise reduction cover 3. The thin sound-absorbing cotton 16 pasted on the inner wall of the pickup hole 15 effectively weakens the reflection of the sound waves inside the hole, reducing the noise interference caused by the sound waves reflecting back and forth inside the hole, so that the microphone 6 can collect the target sound more efficiently. The preamplifier 17 amplifies the weak sound signal and enhances the signal strength. Then, the filter 18 receives the amplified signal and selectively filters out non-target signals such as low-frequency noise and power frequency interference in the environment, purifying the sound signal. Finally, the A / D converter 19 converts the processed analog signal into a digital signal, which is convenient for subsequent storage, transmission or use in scenarios such as remote teaching. During the operation of the device, the heat generated by the internal components of the housing 2 is dissipated through the heat dissipation groove 13. Since the noise reduction cover 3 and the composite sound-absorbing cotton 4 at the corresponding position of the heat dissipation groove 13 adopt a ring-shaped hollow design, together with the covering acoustic filter 14, it can not only ensure that the heat is discharged smoothly and prevent the device from being affected by high temperature, but also effectively block the external noise from entering the device through the heat dissipation channel.

[0034] Working principle: During installation, the microphone can be securely fixed to a suitable location such as the classroom ceiling or wall using bolts and other connectors via the mounting holes 12 on the mounting plates 11 on both sides of the inverted U-shaped mounting base 7. This ensures the overall installation of the equipment is firm and avoids vibration affecting the microphone's stability. In use, the adjusting motor 8 is activated, and its transmission end drives the microphone body 1 to rotate flexibly around the rotating cooperation structure of the connecting rod 9 and the connecting plate 10, achieving precise adjustment of the microphone angle within a certain range. During this process, the connecting rod 9 rotates smoothly within the connecting plate 10, providing stable support for adjusting the angle of the microphone body 1. This ensures that microphone 6 can be accurately aimed at the teacher's lecturing position or the student's speaking area, improving the efficiency of capturing the target sound. When the teacher is lecturing or the student is answering a question, the sound enters through the symmetrically distributed pickup holes 15 on the noise reduction cover 3. The thin sound-absorbing cotton 16 pasted on the inner wall of the pickup hole 15 effectively weakens the reflection of sound waves inside the hole, reducing the noise interference caused by the back-and-forth reflection of sound waves inside the hole, allowing microphone 6 to collect the target sound more efficiently. The dual noise reduction structure formed by the noise reduction cover 3 and the composite sound-absorbing cotton 4 will reduce the interference noise in the surrounding environment (such as noise from outside the window, equipment operation noise, etc.). The microphone 6, through blocking and absorption, further highlights the target sound. The sound signal collected by the microphone 6 is transmitted to the signal processing module 5 inside the housing 2. First, the preamplifier 17 amplifies the weak sound signal to enhance its strength. Then, the filter 18 receives the amplified signal and selectively filters out non-target signals such as low-frequency noise and power frequency interference in the environment, purifying the sound signal. Finally, the A / D converter 19 converts the processed analog signal into a digital signal for subsequent storage, transmission, or use in scenarios such as remote teaching. During the operation of the device, the internal components of the housing 2 work... The generated heat is dissipated through the heat dissipation slot 13. Since the noise reduction cover 3 and the composite sound-absorbing cotton 4 at the corresponding position of the heat dissipation slot 13 adopt a ring-shaped hollow design, together with the covering acoustic filter 14, it can not only ensure that the heat is discharged smoothly and prevent the equipment from being affected by high temperature, but also effectively block external noise from entering the equipment through the heat dissipation channel. At the same time, the composite sound-absorbing cotton 4 between the housing 2 and the noise reduction cover 3 can also reduce the noise generated by the vibration of the internal components of the housing 2. Together with the noise reduction cover 3, they form multiple barriers to continuously block external environmental noise and ensure that the microphone maintains a high-quality sound pickup effect in the complex classroom environment.

[0035] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. A microphone for use in a classroom, comprising a microphone body (1), characterized in that: The microphone body (1) includes a housing (2), a noise reduction cover (3) is fitted on the outside of the housing (2), composite sound-absorbing cotton (4) is filled between the housing (2) and the noise reduction cover (3), a signal processing module (5) is integrated inside the housing (2), a microphone (6) is embedded on one side of the housing (2), and the microphone (6) is electrically connected to the signal processing module (5).

2. A microphone for a classroom according to claim 1, characterized in that: The outer side of the pickup body (1) is fitted with an inverted U-shaped mounting base (7). An adjustment motor (8) is installed on the vertical section of one side of the inverted U-shaped mounting base (7). The transmission end of the adjustment motor (8) passes through the side wall of the inverted U-shaped mounting base (7) and is rigidly connected to the pickup body (1).

3. A microphone for a classroom according to claim 2, characterized in that: A connecting rod (9) extends horizontally from the side of the pickup body (1) away from the adjusting motor (8), and a connecting plate (10) is correspondingly provided on the inner side of the other vertical section of the inverted U-shaped mounting base (7). The connecting rod (9) and the connecting plate (10) form a rotating fit structure.

4. A microphone for a classroom according to claim 2, characterized in that: Mounting plates (11) extend symmetrically from the top ends of both sides of the inverted U-shaped mounting base (7), and mounting holes (12) for fixing are provided on the mounting plates (11).

5. A microphone for a classroom according to claim 1, characterized in that: The pickup body (1) has a heat dissipation groove (13) on the side away from the microphone (6). At the corresponding position of the heat dissipation groove (13), the noise reduction cover (3) and the composite sound-absorbing cotton (4) are both designed with a ring-shaped hollow.

6. A microphone for a classroom according to claim 1, characterized in that: The annular cutout of the noise reduction cover (3) is covered with an acoustic filter (14). Symmetrically distributed pickup holes (15) are provided on the other side of the noise reduction cover (3). The microphone (6) is embedded inside the pickup hole (15), and a thin layer of sound-absorbing cotton (16) is pasted on the inner wall of the pickup hole (15).

7. A microphone for a classroom according to claim 1, characterized in that: The signal processing module (5) includes a preamplifier (17), a filter (18) and an A / D converter (19). The preamplifier (17) is electrically connected to the microphone (6). The filter (18) is connected to the output of the preamplifier (17). The A / D converter (19) is connected to the output of the filter (18).

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