Noise-reduction Y-type wireless Bluetooth microphone

Abstract

The utility model discloses a noise-reducing Y-shaped wireless Bluetooth microphone, which relates to the field of microphones and comprises a first shell, the first shell is in threaded connection with a second shell through screws, and a sound pickup device is embedded in a port where the first shell is connected with the second shell. The wireless microphone not only is smaller and more exquisite and hidden in form, but also technically solves a plurality of defects of the existing collar clamp wireless microphone technology in the aspects of audio acquisition quality, concealment, use convenience and signal stability, and through the unique Y-shaped design, the wireless microphone realizes convenient operation by a user, and meanwhile, the wireless microphone is more convenient to use. By optimizing the structural design and the audio processing algorithm, multi-directional sound signals can be effectively separated and processed, the noise reduction capability and the signal transmission stability are remarkably improved, clearer and more stable human voice audio acquisition, audio transmission and background noise elimination functions are realized, and the high-standard audio requirements of professional and individual users are met.

Description

Technical Field

[0001] The utility model relates to the field of microphones, and particularly to a noise-reducing Y-shaped wireless Bluetooth microphone. Background Art

[0002] High-quality human voice audio acquisition is not only very important for professional fields such as news reporting, interviews, and meeting records, but also increasingly becomes a demand in the public's daily life. Traditional recording devices, such as handheld microphones, desktop microphones, or microphones built into laptops and smartphones, although widely used, have significant limitations in terms of portability, sound quality clarity, concealability, and noise reduction effect.

[0003] Currently, handheld microphones and desktop microphones on the market are designed to focus more on recording effects. However, due to their large volume, they are not suitable for use in occasions where concealment or portability is required. The microphones built into laptops and smartphones are portable, but they are prone to capturing a large amount of background noise in a noisy environment, affecting the recording quality. In addition, the design of these microphones usually only considers the pickup of a single sound source, resulting in the final audio lacking a true stereo effect.

[0004] In some interview or recording occasions, in order to achieve transmission stability and durability, the existing lapel wireless Bluetooth microphones are usually large in volume and not easy to hide. In addition, in a noisy environment, these microphones will inevitably capture a large amount of background noise, further reducing the recording quality. Traditional single-microphone or dual-microphone systems often cannot effectively separate the sound source and background noise when processing stereo or multi-channel audio, thus reducing the clarity and quality of human voice audio.

[0005] In the existing wireless microphone solutions, the antenna part of the Bluetooth module is limited by the volume and design of the fuselage, and usually cannot achieve ideal performance. There is still significant room for improvement in the existing wireless microphone technology in terms of audio acquisition quality, concealability, ease of use, and signal stability.

[0006] Therefore, it is particularly necessary to develop a new type of noise-reducing Y-shaped wireless Bluetooth microphone for human voice to solve the problems of the existing wireless microphones in terms of concealability, true stereo effect, and background noise recognition and elimination. Summary of the Utility Model

[0007] A new type of portable Y-shaped noise-reducing lapel wireless Bluetooth microphone is provided to solve the problems of poor concealability of wireless microphones, insufficient true stereo effect, and insufficient background noise recognition and elimination in the existing human voice recording scenario technology.

[0008] To achieve the above object, the present utility model provides the following technical solution: a noise-reducing Y-shaped wireless Bluetooth microphone, including a first housing, the first housing and the second housing are fixedly connected by riveting and screw threads, and a sound pickup device is embedded inside the port where the first housing and the second housing are connected.

[0009] Preferably, a signal processor is built inside the cavity formed by the first housing and the second housing and is connected to three sound pickup devices, and the sound signal is processed through multi-channel sound signal capture, time difference and phase difference analysis, frequency domain analysis, signal strength and feature analysis, spatial filtering and signal fusion, inverse Fourier transform, voiceprint presetting, dynamic learning and adaptation algorithms. By comprehensively applying a variety of advanced algorithms, more stereoscopic and clear human voice pickup is achieved.

[0010] Preferably, both the first housing and the second housing are in a "Y" shape, and the length of the "Y" branches of the first housing and the second housing is 15 - 25 mm, the diameter is 7 - 12 mm, and the "Y" opening angle of the first housing and the second housing is designed to be 90 - 120 degrees. The "Y" shape structure design optimizes portability and operation comfort, and also takes into account structural strength and reasonable utilization of internal space.

[0011] Preferably, the "Y" - shaped cavity formed inside the first housing and the second housing ensures the reasonable utilization of internal space, and the internal antenna layout utilizes the space inside the "Y" - shaped structure main body to provide enhanced wireless signal transmission ability and ensure stable connection in various environments. And an integrated energy management system composed of a wireless coil and an antenna is equipped inside the "Y" - shaped cavity, which supports wired and wireless charging methods. The integrated energy management system is adopted to support direct charging through metal contacts and wireless charging function with an internal wireless coil.

[0012] Preferably, the number of the sound pickup devices is three, and the three sound pickup devices are respectively embedded inside the port formed by the "Y" - shaped first housing and the second housing, and are designed to optimize frequency response and signal - to - noise ratio, ensuring clear and rich - detail sound signals received from multiple directions.

[0013] Preferably, the diameter of the sound pickup device is about 4 - 6 mm, and the height is 3 - 5 mm.

[0014] In the above technical solution, the technical effects and advantages provided by the present utility model are:

[0015] The utility model is not only more compact and concealed in form, but also solves multiple defects of the existing clip-on wireless microphone technology in terms of audio acquisition quality, concealment, ease of use, and signal stability. Through its unique Y-shaped design, while facilitating user operation, the wireless microphone can effectively separate and process multi-directional sound signals and significantly improve the noise reduction ability and signal transmission stability by optimizing its structural design, audio processing algorithm, wireless technology, and user experience. Without sacrificing sound quality and portability, it provides high concealment while achieving clearer and more stable human voice audio acquisition, audio transmission, and background noise cancellation functions, ultimately providing high-quality audio recording effects and meeting the high-standard audio requirements of professional and individual users. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings.

[0017] Figure 1 is a perspective view of the overall structure of the present utility model from the first perspective;

[0018] Figure 2 is a perspective view of the overall structure of the present utility model from the second perspective;

[0019] Figure 3 is a structural diagram of the interior of the first housing of the present utility model;

[0020] Figure 4 is a perspective view of the wireless coil structure of the present utility model;

[0021] Figure 5 is a perspective view of the antenna structure of the present utility model.

[0022] Description of the reference numerals:

[0023] 1. First housing; 2. Second housing; 3. Screw; 4. Port; 5. Sound pickup device; 6. Battery pack; 7. Wireless coil; 8. Antenna. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the following will further introduce the present utility model in detail in conjunction with the drawings.

[0025] The present utility model provides as Figures 1-5A noise-canceling Y-shaped wireless Bluetooth microphone shown in the figure includes a first housing 1, the first housing 1 is fixedly connected to a second housing 2 by riveting and a screw 3 in a threaded manner, and a sound pickup device 5 is embedded inside a port 4 where the first housing 1 is connected to the second housing 2.

[0026] Inside the cavity formed by the first housing 1 and the second housing 2, a signal processor is built in and connected to three sound pickup devices 5. The sound signal is analyzed through multi-channel sound signal capture, time difference and phase difference analysis, frequency domain analysis, signal strength and feature analysis, spatial filtering and signal fusion, inverse Fourier transform, voiceprint presetting, dynamic learning and adaptation algorithms. Advanced algorithms are used to analyze the differences in the time and intensity of the sound signal to ensure better use effects.

[0027] Both the first housing 1 and the second housing 2 are in a "Y" shape, and the "Y"-shaped branch lengths of the first housing 1 and the second housing 2 are 15 - 25 mm, and the diameters are 7 - 12 mm. Moreover, the "Y"-shaped opening angle of the first housing 1 and the second housing 2 is designed to be 120 degrees. The "Y"-shaped structure design optimizes portability and operation comfort, and also takes into account structural strength and the rational use of internal space.

[0028] The "Y"-shaped cavity formed inside the first housing 1 and the second housing 2 ensures the rational use of internal space. The internal antenna layout utilizes the space inside the "Y"-shaped structure main body to provide enhanced wireless signal transmission ability and ensure stable connection in various environments. Moreover, an integrated energy management system composed of a wireless coil 7 and an antenna 8 is equipped inside the "Y"-shaped cavity, supporting wired and wireless charging methods. The integrated energy management system of the wireless coil 7 and the antenna 8 is adopted, supporting direct charging through metal contacts and the wireless charging function of the built-in wireless coil 7. The built-in wireless coil 7 realizes wireless charging through electromagnetic induction, providing a more convenient and flexible charging method.

[0029] The number of sound pickup devices 5 is set to three, and the three sound pickup devices 5 are respectively embedded inside the port 4 formed by the "Y"-shaped first housing 1 and the second housing 2, designed to optimize the frequency response and signal-to-noise ratio, ensuring clear and detailed sound signals received from multiple directions.

[0030] The diameter of the sound pickup device 5 is about 4 - 6 mm, and the height is 3 - 5 mm.

[0031] The specific working process is as follows:

[0032] 1. Sound collection:

[0033] The three sound pickup devices of the microphone are respectively located at the ends of the three branches of the "Y"-shaped structure and can capture sound signals from different directions (front, left, right).

[0034] The two pickup devices at the top process the left and right channel signals respectively, while the pickup device at the bottom enhances the recording effect of the third channel and captures background noise.

[0035] This multi-directional pickup design not only helps to hide the microphone, but also optimizes the capture of sound propagation and improves the recording quality.

[0036] 2. Sound signal processing:

[0037] Multi-channel sound signal capture: Each pickup device converts the captured analog sound signal into a digital signal and inputs it into the built-in signal processor.

[0038] Time difference and phase difference analysis: The signal processor calculates the time difference of arrival and phase difference of the same sound event on different pickup devices. This is achieved through the cross-correlation algorithm, which helps to distinguish sound sources in different directions.

[0039] Frequency domain analysis: The fast Fourier transform (FFT) is used to convert the sound signal in the time domain into a frequency domain signal, and the energy distribution of different frequency components is analyzed, so as to more accurately distinguish human voices and background noise.

[0040] Signal intensity and feature analysis: By analyzing the intensity and features (such as pitch, frequency range) of the sound signal, the target sound (such as human voice) and non-target sound (such as background noise) are further distinguished.

[0041] Spatial filtering and signal fusion: Adaptive spatial filtering technology is used to attenuate non-target noise according to direction and intensity information, and at the same time fuse the target sound signals from different directions to ensure the clarity of the human voice. 3. Noise suppression:

[0042] Preprocessing stage: At the initial recording, the microphone samples the human voice and background sound to establish a noise model.

[0043] Real-time noise reduction:

[0044] 1). Multi-channel sound signal processing

[0045] Sound acquisition: Through the three pickup devices of the microphone, sound signals are collected from different directions and the analog signals are converted into digital signals.

[0046] Time difference and phase difference calculation: The generalized cross-correlation (GCC) method is used to calculate the time difference of arrival (TDOA) and phase difference of the sound signal on different pickup devices.

[0047]

[0048] where, xi (t) and x j (t) are the signals captured by two pickup devices respectively, and τ is the time difference.

[0049] 2). Frequency domain analysis and signal processing

[0050] Fast Fourier Transform (FFT): Perform FFT on the time-domain signal of each pickup device to convert it into a frequency-domain signal.

[0051]

[0052] Frequency feature extraction: Analyze the energy distribution of each frequency component to identify the human voice frequency range (usually between 300 Hz and 3400 Hz).

[0053] Frequency domain filtering: Based on the frequency features, design an adaptive filter to suppress the background noise frequency components.

[0054] Use the Adaptive Noise Cancellation (ANC) algorithm:

[0055] y(t) = x(t) - α·n(t)

[0056] where x(t) is the original signal, n(t) is the estimated noise signal, α is the adaptive weight, and n(t) is the estimated noise signal.

[0057] 3). Spatial filtering and signal fusion

[0058] Beamforming: Utilize the spatial arrangement of the pickup devices to enhance the human voice signal in a specific direction and suppress the noise in other directions.

[0059] Use the Delay and Sum (DAS) beamforming:

[0060]

[0061] where is the signal of the i-th pickup device, and τ i is the corresponding delay.

[0062] Signal fusion: Fuse the processed multi-channel signals to generate the final clear human voice signal.

[0063] 4). Inverse Fourier Transform (IFFT)

[0064] Perform the Inverse Fourier Transform (IFFT) on the processed frequency-domain signal to convert it back to the time-domain signal.

[0065]

[0066] Finally, clear denoised audio is generated.

[0067] 4. Audio Output:

[0068] The processed denoised audio signal is wirelessly transmitted to a receiving device (such as a mobile phone, a voice recorder, etc.) through a built-in Bluetooth module.

[0069] During the transmission process, the Bluetooth module utilizes the enhanced antenna layout within the "Y"-shaped structure to enhance the signal stability and transmission distance.

[0070] 5. Wireless Transmission and Charging:

[0071] Antenna Layout: The built-in antenna layout of the microphone utilizes the space within the main body of the "Y"-shaped structure to provide enhanced wireless signal transmission capabilities and ensure stable connections in various environments.

[0072] Energy Management System: The device is equipped with an integrated energy management system that supports both wired and wireless charging methods. Wireless charging is achieved through an electromagnetic induction charging via a built-in wireless coil, providing a convenient charging experience for users.

[0073] Only some exemplary embodiments of the present utility model are described above by way of illustration. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present utility model, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present utility model.

Claims

1. A noise-canceling Y-shaped wireless Bluetooth microphone, comprising a first housing (1), characterized in that, The first housing (1) and the second housing (2) are fixedly connected by riveting and screw (3) threading, and a sound pickup device (5) is embedded inside the port (4) where the first housing (1) and the second housing (2) are connected. A signal processor is built inside the cavity formed by the first housing (1) and the second housing (2) and is connected to three sound pickup devices (5). The sound signals are analyzed through multi-channel sound signal capture, time difference and phase difference analysis, frequency domain analysis, signal strength and feature analysis, spatial filtering and signal fusion, inverse Fourier transform, voiceprint presetting, and dynamic learning and adaptation algorithms. Both the first housing (1) and the second housing (2) are in a "Y" shape, and the "Y" - shaped branch lengths of the first housing (1) and the second housing (2) are 15 - 25 mm, with a diameter of 7 - 12 mm. Moreover, the "Y" - shaped opening angle of the first housing (1) and the second housing (2) is designed to be 120 degrees. The "Y" - shaped cavity formed inside the first housing (1) and the second housing (2) is equipped with an integrated energy management system composed of a wireless coil (7) and an antenna (8), supporting both wired and wireless charging methods.

2. The noise-canceling Y-shaped wireless Bluetooth microphone according to claim 1, characterized in that, The number of the sound pickup devices (5) is set to three, and the three sound pickup devices (5) are respectively embedded inside the port (4) formed by the first housing (1) and the second housing (2) in a "Y" shape.

3. The noise-canceling Y-shaped wireless Bluetooth microphone according to claim 1, characterized in that, The diameter of the sound pickup device (5) is 4 - 4 - 6 mm, and the height is 3 - 5 mm.

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