TWS earphone capable of switching air conduction and active noise reduction functions

Abstract

The invention relates to the technical field of earphones, in particular to a TWS earphone capable of switching air conduction and active noise reduction functions, a circuit board is arranged in an earphone cavity, and the circuit board is integrated with an audio processing chip and a microphone array; the earphone can be switched to an OWS air conduction mode or a TWS in-ear active noise reduction mode by replacing ear caps of different structures, convenient switching between the OWS air conduction mode and the TWS active noise reduction mode is realized through linkage of the detachable ear caps and an audio algorithm, the wearing comfort of a motion scene and the noise reduction requirement of a noisy environment are considered, and the problem that a traditional earphone is single in function is solved.

Description

Technical Field

[0001] The present invention relates to the field of earphone technology, and specifically to a TWS earphone with switchable air conduction and active noise reduction functions. Background Art

[0002] Currently, OWS air conduction headphones use a non-in-ear design and are equipped with ear hooks to achieve long-term wearing comfort without affecting hearing. However, their inherent defects are sound leakage and music distortion (usually distortion rate > 5%), which leads to privacy leakage and reduced sound quality. TWS in-ear headphones achieve physical sound insulation by plugging the ear cap into the ear canal, which significantly improves the sound leakage problem and the sound distortion rate is ≤ 2%. However, long-term wearing can easily cause pressure on the ear canal, affecting hearing health, and they are not suitable for people with narrow ear canals. In the existing technology, there is a lack of a product that can take into account the advantages of both types of headphones, meet the noise reduction needs of different scenarios, solve the contradiction between wearing comfort and applicability, and avoid product stacking and waste due to single functions. Summary of the Invention

[0003] (1) Technical problems solved

[0004] In response to the shortcomings of the existing technology, the present invention provides a TWS headset with switchable air conduction and active noise reduction functions.

[0005] (2) Technical solution

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a TWS headset with switchable air conduction and active noise reduction functions, comprising a housing, a battery compartment, an ear hook, an earphone cavity, and a detachable ear cap;

[0007] The battery compartment is located inside the housing, the battery compartment is connected to the ear hook, the ear hook is connected to the earphone cavity, and the earphone cavity is detachably connected to the ear cap;

[0008] A circuit board is set in the earphone cavity, which integrates an audio processing chip and a microphone array; by replacing ear caps with different structures, it can switch to OWS air conduction mode or TWS in-ear active noise reduction mode.

[0009] Furthermore, the present invention is improved in that the ear caps include OWS-specific ear caps and TWS-specific ear caps;

[0010] The OWS ear cap has an open structure and a directional sound transmission groove on the surface;

[0011] The TWS-specific ear cap is an in-ear silicone structure with a sealing ring inside.

[0012] Furthermore, the present invention has been improved in that the microphone array includes a feedforward microphone and a feedback microphone for collecting ambient noise and transmitting it to an audio processing chip; the audio processing chip generates reverse sound waves through an LMS algorithm to achieve an ANC active noise reduction function.

[0013] Furthermore, the present invention has been improved in that the battery compartment supplies power to the earphone cavity through the circuit in the ear hook, and a low-latency DSP processing unit is provided on the circuit board to ensure that the noise reduction signal processing delay is less than 20 microseconds.

[0014] Furthermore, the present invention has been improved in that the ear hook is made of memory alloy and the surface is covered with a skin-friendly silicone layer, and a mode switching button is provided on the outside of the earphone cavity to control the linkage switching of the ear cap structure and the audio algorithm.

[0015] Furthermore, the present invention is improved in that the audio processing chip has a built-in anti-wind noise algorithm module, which automatically activates a high-pass filter to shield the wind noise frequency band when high-frequency random noise is detected.

[0016] (3) Beneficial effects

[0017] Compared with the prior art, the present invention provides a TWS headset with switchable air conduction and active noise reduction functions, which has the following beneficial effects:

[0018] Dual-mode adaptive switching: Through the linkage of detachable ear caps and audio algorithms, convenient switching between OWS air conduction and TWS active noise reduction modes is achieved, taking into account both the wearing comfort in sports scenes and the noise reduction needs in noisy environments, solving the problem of single function of traditional headphones.

[0019] Optimized noise reduction performance: Combining physical sealing with electronic ANC algorithms, the noise cancellation efficiency in TWS mode is 25% higher than that of traditional in-ear headphones, especially in low-frequency bands (such as subway engine sounds 100-500Hz). At the same time, the anti-wind noise algorithm reduces high-frequency noise interference during outdoor use.

[0020] Wearing comfort and applicability: OWS mode avoids ear canal pressure and is suitable for long-term wear; TWS ear caps provide multiple specifications to adapt to the ear canal structure of different people and expand the user group.

[0021] Environmentally friendly and portable design: Functional integration is achieved through a modular structure, reducing the stacking of single-function products and reducing electronic waste. The foldable storage design reduces the overall volume of the device by 40%, making it easier to carry.

[0022] Sound quality and delay control: Directional sound transmission algorithm and EQ compensation technology ensure stable sound quality in both modes, with distortion rate ≤ 3%; the low-latency DSP processing unit ensures real-time noise reduction and avoids audio and video synchronization issues. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the first perspective three-dimensional structure of the main body of the present invention;

[0024] Figure 2 A schematic diagram of the second perspective three-dimensional structure of the main body of the present invention;

[0025] Figure 3-5 This is a schematic diagram of the installation structure of the TWS ear cap in the present invention;

[0026] Figure 6-8 Schematic diagram of the installation structure of the OWS special ear cap in the present invention;

[0027] In the picture: 1. Storage case; 2. Ear hook; 3. Earphone battery compartment; 4. TWS ear cap; 5. Circuit board; 6. Earphone cavity; 7. OWS ear cap. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention 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 making creative efforts are within the scope of protection of the present invention.

[0029] See also Figures 1-8 The TWS earphones with switchable air conduction and active noise reduction functions of the present invention include a housing 1, a battery compartment 3, an ear hook 2, an earphone cavity 6 and a detachable ear cap;

[0030] The battery compartment 3 is located inside the housing 1, the battery compartment 3 is connected to the ear hook 2, the ear hook 2 is connected to the earphone cavity 6, and the earphone cavity 6 is detachably connected to the ear cap;

[0031] A circuit board 5 is arranged in the earphone cavity 6, and the circuit board 5 integrates an audio processing chip and a microphone array; by replacing ear caps with different structures, it can switch to OWS air conduction mode or TWS in-ear active noise reduction mode.

[0032] Furthermore, the present invention is improved in that the ear caps include an OWS-specific ear cap 7 and a TWS-specific ear cap 4;

[0033] The OWS ear cap 7 is an open structure with directional sound transmission grooves on the surface;

[0034] The TWS-specific ear cap 4 is an in-ear silicone structure with a sealing ring inside.

[0035] The microphone array includes a feedforward microphone and a feedback microphone, which are used to collect ambient noise and transmit it to the audio processing chip; the audio processing chip generates reverse sound waves through the LMS algorithm to realize the ANC active noise reduction function.

[0036] The battery compartment 3 supplies power to the earphone cavity 6 through the circuit in the ear hook 2, and a low-latency DSP processing unit is provided on the circuit board 5 to ensure that the noise reduction signal processing delay is less than 20 microseconds.

[0037] The ear hook 2 is made of memory alloy and is covered with a skin-friendly silicone layer. A mode switching button is set on the outside of the earphone cavity 6 to control the linkage switching of the ear cap structure and the audio algorithm.

[0038] The audio processing chip has a built-in anti-wind noise algorithm module, which automatically activates a high-pass filter to shield the wind noise frequency band when high-frequency random noise is detected.

[0039] Working mode switching principle:

[0040] (1) OWS gas conduction mode:

[0041] When the OWS-specific ear cap 7 is installed, its open structure, combined with the directional sound transmission grooves on its surface, focuses the sound waves emitted by the earphone cavity 6 at the entrance of the ear canal, achieving air conduction sound transmission. At this time, the audio processing chip activates the directional sound transmission algorithm, enhancing the directionality of mid- and high-frequency signals and reducing sound leakage. Actual measurement data shows that in this mode, sound leakage is reduced by 30% compared to traditional OWS earphones, and the distortion rate is kept within 4%, making it suitable for long-term wear in sports scenes.

[0042] (2) TWS in-ear active noise reduction mode:

[0043] When replaced with the TWS-specific ear cap 4, the in-ear silicone structure forms a sealed space with the ear canal, achieving preliminary physical sound isolation. At the same time, the audio processing chip automatically switches to ANC active noise reduction mode:

[0044] Noise collection and processing: The feedforward microphone collects ambient noise outside the ear canal, and the feedback microphone collects residual noise inside the ear canal. Both signals are converted into digital signals by the ADC and then input into the chip;

[0045] Reverse sound wave generation: The chip uses FFT (Fast Fourier Transform) to analyze the noise spectrum and calculates and generates a counteracting sound wave with opposite phase in real time based on the LMS (Least Mean Square) algorithm. The key formula is: y(t) = -n(t), ensuring that the original noise n(t) and the counteracting sound wave y(t) cancel each other out after superposition.

[0046] Adaptive optimization: When the microphone detects wind noise (such as high-frequency signals above 10kHz), the chip automatically activates the anti-wind noise algorithm and blocks the frequency band above 8kHz through the high-pass filter to avoid attenuation of the noise reduction effect;

[0047] Sound quality compensation: The chip has a built-in EQ equalizer to compensate for the low-frequency components that may be lost during the noise reduction process, maintaining the dynamic range of the original music.

[0048] 3. Key technical parameters:

[0049] Noise reduction depth: up to 30dB in the 100-2000Hz frequency band;

[0050] Delay time: The delay from noise collection to reverse sound wave output is 18 microseconds;

[0051] Battery life: 5 hours of continuous work in ANC mode, 7 hours in OWS mode;

[0052] Adaptive ear canal diameter: TWS ear caps are available in three sizes: S / M / L, suitable for ear canal inner diameters of 5-8mm.

[0053] In the description herein, it should be noted that relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "include," "comprise," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0054] While the embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and alterations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A TWS headset with switchable air conduction and active noise reduction functions, featuring: It comprises a housing (1), a battery compartment (3), an ear hook (2), an earphone cavity (6) and a detachable ear cap; The battery compartment (3) is located inside the housing (1), the battery compartment (3) is connected to the ear hook (2), the ear hook (2) is connected to the earphone cavity (6), and the earphone cavity (6) is detachably connected to the ear cap; A circuit board (5) is arranged in the earphone cavity (6), and the circuit board (5) integrates an audio processing chip and a microphone array; by replacing ear caps with different structures, it is possible to switch to the OWS air conduction mode or the TWS in-ear active noise reduction mode.

2. The TWS earphones with switchable air conduction and active noise reduction functions according to claim 1, characterized in that: The ear caps include an OWS-specific ear cap (7) and a TWS-specific ear cap (4); The OWS special ear cap (7) is an open structure, and a directional sound transmission groove is provided on the surface; The TWS dedicated ear cap (4) is an in-ear silicone structure with a sealing ring arranged inside.

3. The TWS earphones with switchable air conduction and active noise reduction functions according to claim 2, characterized in that: The microphone array includes a feedforward microphone and a feedback microphone, which are used to collect ambient noise and transmit it to the audio processing chip; the audio processing chip generates reverse sound waves through the LMS algorithm to realize the ANC active noise reduction function.

4. The TWS earphones with switchable air conduction and active noise reduction functions according to claim 3, characterized in that: The battery compartment (3) supplies power to the earphone cavity (6) via a circuit in the ear hook (2), and a low-latency DSP processing unit is provided on the circuit board (5) to ensure that the noise reduction signal processing delay is less than 20 microseconds.

5. The TWS earphones with switchable air conduction and active noise reduction functions according to claim 4, characterized in that: The ear hook (2) is made of memory alloy and is covered with a skin-friendly silicone layer. A mode switching button is provided on the outside of the earphone cavity (6) to control the linkage switching between the ear cap structure and the audio algorithm.

6. The TWS earphones with switchable air conduction and active noise reduction functions according to claim 5, characterized in that: The audio processing chip has a built-in anti-wind noise algorithm module, which automatically activates a high-pass filter to shield the wind noise frequency band when high-frequency random noise is detected.

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