A replaceable cord type high fidelity noise reduction earphone based on a Loth iron moving unit

Abstract

The application belongs to the technical field of electro-acoustic conversion equipment, and particularly relates to a replaceable-line high-fidelity noise-reducing in-ear earphone based on a floor iron moving unit, which comprises a 5-unit 4-frequency division hybrid driving module formed by the floor iron moving unit and a micro moving coil unit, and the two achieve signal cooperation through a phase synchronization circuit; full-frequency sound quality optimization and hybrid noise reduction are achieved through the phase synchronization circuit and a DSP+ANC chip, a sound cavity is matched with a shape memory alloy damping adjusting sheet, magnetic attraction and sealing of a 2-pin interface improve durability and sealing performance, a double-mode switching audio line and a three-in-one replaceable plug adapt to multiple devices, and touch control and a selectable Bluetooth kit realize convenient interaction. The application breaks through the sound quality limitation of a single unit through a double-unit cooperative driving structure, realizes dynamic adaptation of noise reduction and sound quality through an adaptive acoustic adjusting system, improves durability and personalized upgrade space through a reinforced replaceable line design, enriches use scenarios through an intelligent interaction module, and meets the multiple needs of high-end users for high-fidelity sound quality, flexible use and intelligent experience.

Description

Technical Field

[0001] This invention relates to the field of electroacoustic conversion equipment technology, specifically to a replaceable-cable high-fidelity noise-canceling in-ear headphone based on Knowles ferrule drivers. Background Technology

[0002] In the high-end audio equipment market, the core competitive indicators for in-ear headphones are sound resolution, full-frequency balance, noise cancellation adaptability, and ease of use. Knowles balanced armature drivers are highly favored for their high-frequency performance due to their high sensitivity and low distortion, but traditional single-armature driver designs still have limitations in mid-low frequency extension, bass elasticity, and soundstage stereo effect. At the same time, the acoustic structure of existing headphones is mostly a fixed design, which cannot dynamically adjust acoustic parameters according to changes in ambient noise and music genre, resulting in insufficient adaptability between noise cancellation effect and sound quality performance.

[0003] In addition, the sealing and durability of the interface of existing detachable cable headphones need to be improved, the cable has limited functionality and cannot meet users' personalized sound quality needs for different music styles (such as classical, pop and rock); and it lacks intelligent interactive functions, making it difficult to achieve convenient operations such as custom sound effect storage and noise cancellation mode switching, and cannot fully adapt to the diversified usage scenarios of high-end users. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a high-fidelity noise-canceling in-ear headphone with a replaceable cable based on Knowles armature drivers. It overcomes the limitations of traditional single- or dual-driver sound quality through a 5-unit, 4-way hybrid drive structure, achieving precise full-frequency coverage through a combination of physical and electronic crossover technology. An adaptive acoustic adjustment system dynamically adapts noise cancellation to sound quality, while a reinforced replaceable cable design enhances durability and allows for personalized upgrades. An intelligent interaction module enriches usage scenarios, meeting the diverse needs of high-end users for high-fidelity sound quality, flexible use, and intelligent experiences. This invention possesses significant technological innovation advantages and broad market application prospects, solving the shortcomings of existing headphones in terms of full-frequency balance, noise cancellation adaptability, and convenience, and addressing the inability of high-end users to meet their diverse needs for high-fidelity sound quality, flexible use, and intelligent experiences.

[0005] To achieve the above objectives, the present invention specifically adopts the following technical solution: A replaceable cable high-fidelity noise-canceling in-ear headphone based on Knowles armature driver includes headphone shell, driver unit, signal processing module, ear tips and audio cable; The driving unit is a 5-unit 4-way hybrid driving module, adopting a "1 dynamic driver, 3 iron drivers, 1 bone conduction driver" structure. It is coaxially set in the housing inside the earphone shell. It includes a 10mm magnesium-aluminum alloy diaphragm dynamic driver unit, a Knowles TWFK-30017 imported Knowles iron driver unit, a Knowles ED-29689 Knowles iron driver unit, an auxiliary Knowles iron driver unit, and a 10mm high-vibration bone conduction unit. Each unit works in coordination with the electronic crossover circuit through the physical crossover structure to achieve reasonable allocation of low, mid, high, and ultra-high frequency bands. At the same time, the phase synchronization circuit realizes the signal coordination of multiple units and eliminates frequency band transition distortion. Among them, the 10mm magnesium-aluminum alloy diaphragm dynamic coil unit adopts a high magnetic energy product neodymium iron boron magnetic circuit, and the diaphragm is rigidly reinforced. It is responsible for the low frequency range (20Hz-500Hz) output, improving the low frequency depth and elasticity. Among them, the KnowlesTWFK-30017 Knowles ferrite driver unit features an optimized magnetic gap design and a composite bio-fiber diaphragm, responsible for mid-frequency reproduction (500Hz-5kHz), ensuring accurate and natural mid-frequency details of vocals and instruments; Among them, the Knowles ED-29689 Knowles ferroelectric unit: adopts a reinforced magnetic circuit and ultra-thin diaphragm structure, responsible for the high frequency range (5kHz-15kHz) extension, improving high frequency resolution and clarity; Among them, the auxiliary Knowles iron-driven unit: supplements the ultra-high frequency range (15kHz-40kHz) and enhances the reproduction of ultra-high frequency details; Among them, the 10mm high-vibration bone conduction unit adopts a piezoelectric ceramic driving structure, which works in synergy with the acoustic unit to enhance the stereo effect of the sound field and low-frequency vibration feedback, thereby improving the immersive listening experience.

[0006] The signal processing module integrated inside the earphone shell includes a high-performance DSP chip and an active noise cancellation (ANC) chip; Among them, the DSP chip performs real-time frequency response compensation and phase calibration for the acoustic characteristics of the 5-unit 4-way crossover, and combines electronic crossover algorithm to accurately adjust the gain of the entire frequency band from 20Hz to 40kHz to ensure smooth connection of each unit. Among them, the ANC chip, in conjunction with a matching miniature MEMS microphone array (2 feedforward microphones + 1 feedback microphone), realizes a hybrid noise reduction mode of passive and active noise reduction, and can dynamically switch between three levels of noise reduction: light, medium and deep, according to the intensity of ambient noise.

[0007] The earphone shell has an internal acoustic cavity, which is connected to an acoustic channel on the shell. The acoustic cavity includes a spiral main acoustic channel and an adaptive damping secondary channel. Among them, the spiral main acoustic channel has a width of 2.5-3mm, with a 2-2.5mm thick high-density rubber noise reduction patch attached to the inner wall, and a 4-5mm thick sound-absorbing fiber filled at the bottom to reduce sound wave reflection interference; Among them, the adaptive damping sub-channel has a built-in damping adjustment plate made of shape memory alloy. The opening and closing angle of the damping plate (0°-45°) is controlled by current heating to achieve dynamic adjustment of acoustic impedance and adapt to the sound quality requirements of different frequency bands.

[0008] The earplugs are detachably mounted at the port of the acoustic channel. They are made of temperature-sensitive silicone with a temperature response range of 25-40℃ and are covered with a skin-friendly antibacterial coating. They soften and conform to the ear canal temperature, improving sealing performance and wearing comfort, and increasing the passive noise reduction base value by 3-5dB.

[0009] The audio cable is a dual-mode switching audio cable, with the core conductor containing spiral pure silver wire and a built-in miniature switching switch; The core conductor is a 216-core single-crystal copper-silver hybrid braided wire, which is hand-braided with 6 strands. It combines the warm mid-frequency of single-crystal copper with the high-resolution high-frequency of silver wire. The middle section of the wire integrates a 30-35cm long spiral pure silver conductor with a spiral diameter of 4-5mm and a wire diameter of 0.25-0.3mm. It also has a built-in micro switch that can realize one-button switching between "equalization mode: copper-silver hybrid transmission" and "style mode: silver wire dominates high frequency / copper wire dominates low frequency" to adapt to different music types. The audio cable is wrapped with a multi-layer shielding structure, including a polyimide insulation layer, a copper braided shielding layer, an aluminum foil shielding layer, and a TPE wear-resistant outer sheath, which are wrapped from the inside out. The copper braided shielding layer has a coverage of 95%, which effectively blocks electromagnetic interference and radio frequency interference and reduces signal transmission loss. The replaceable cable interface is integrated into the earphone shell, with a 0.78 mm dual-pin (2-pin) flat female connector inside. The female connector has a built-in ring magnetic positioning structure and a fluororubber sealing gasket. The pins are made of gold-plated rhodium alloy, increasing the insertion and removal life to more than 5,000 times. It also has IPX5 waterproof and dustproof capabilities and forms an electrical connection with Knowles iron-balanced drivers and miniature dynamic drivers. The replaceable plug uses a "three-in-one" detachable plug base and comes with three plug modules: 3.5mm single-ended, 2.5mm balanced, and 4.4mm balanced. The plug contacts use a gold-plated + rhodium layer composite process, with a plug-in / plug-out cycle of ≥3000 times. The base has a built-in anti-misinsertion positioning groove, allowing for quick replacement without tools.

[0010] The earphone shell also integrates an intelligent interaction module, including a touch sensing unit, a wireless interaction module, and a low-power control circuit. Among them, the touch sensing unit is a capacitive touch sensor integrated on the side of the earphone shell, which supports single click to skip songs, double click to pause / play, and long press to adjust the noise reduction mode. The noise reduction modes are: light, medium, deep and transparent, with a response time of ≤100ms. The wireless interaction module is an optional Bluetooth adapter that supports Bluetooth 5.3 and LC3 codecs. The kit has a built-in lithium battery and NFC quick pairing function, with a battery life of 8 hours. Users can customize EQ parameters (5-band equalizer adjustment), store 3 user sound effect presets, and check headphone status (battery level, plug type, noise cancellation level) via a mobile APP. The low-power control circuit uses a low-power MCU chip with a standby power consumption of ≤5μA. When used with a Bluetooth kit, the total battery life can reach 24 hours, including charging case recharging.

[0011] Furthermore, the headphones have a frequency response range of 15-40kHz, a total harmonic distortion of ≤1.2%, an impedance of 10-12Ω, and a sensitivity of 111-113dB.

[0012] Furthermore, the earphone shell is made of one of three materials: carbon fiber composite material, stable wood, and high-strength engineering plastic. The carbon fiber version weighs ≤8g, increases rigidity by 30%, and reduces resonance interference. The carbon fiber version has the following specifications: impedance 11Ω, sensitivity 112dB, frequency response range 15Hz-40kHz, and total harmonic distortion (THD) ≤1.0%. Among them, the stabilized wood version has the following characteristics: impedance 10Ω, sensitivity 113dB, frequency response range 15Hz-40kHz, and total harmonic distortion (THD) ≤0.8%; Among them, the engineering plastic version has the following characteristics: impedance 12Ω, sensitivity 111dB, frequency response range 18Hz-38kHz, and total harmonic distortion (THD) ≤1.2%; The noise reduction performance of the headphones is as follows: 25-30dB noise reduction in the low frequency band (50-500Hz), 28-32dB noise reduction in the mid frequency band (500-2000Hz), 22-26dB noise reduction in the high frequency band (2000-8000Hz), and ambient sound gain ≤3dB in transparency mode.

[0013] Compared with the prior art, the present invention provides a replaceable cable high-fidelity noise-canceling in-ear headphone based on Knowles armature drivers, which has the following beneficial effects: 1. This invention employs a dual-unit collaborative driving structure of Knowles ferrite core and miniature dynamic core. By eliminating frequency band transition distortion through a phase synchronization circuit and combining real-time frequency response compensation and phase calibration of a DSP chip, it retains the advantages of Knowles cores in high-frequency clarity and low distortion while enhancing the depth and elasticity of mid-low frequencies through the miniature dynamic core, achieving a wide frequency range of 15Hz-40kHz. Furthermore, it is paired with a dual-mode switching audio cable with a spiral pure silver conductor, allowing for flexible switching of transmission modes according to music genre. This results in rich and full low frequencies, accurate and natural mid frequencies, and transparent and extended high frequencies, with low total harmonic distortion across the entire frequency range and excellent soundstage stereo effect, fully meeting the stringent requirements for high-fidelity sound quality.

[0014] 2. This invention improves the basic value of passive noise reduction by using temperature-sensitive sealing earplugs that soften and fit the ear canal according to temperature. The active noise reduction module uses a MEMS microphone array with 2 feedforward and 1 feedback, combined with an ANC chip to dynamically switch noise reduction levels, effectively blocking interference from traffic noise, environmental noise and other scenarios. At the same time, it takes into account both noise reduction needs and the safety of daily communication, avoiding the single noise reduction mode and insufficient adaptability of headphones.

[0015] 3. This invention features an enhanced and upgraded replaceable cable system, improving both durability and compatibility. The magnetically sealed replaceable cable interface incorporates a built-in annular magnetic positioning and a fluororubber sealing gasket. The pins are made of gold-plated rhodium alloy, increasing insertion and removal lifespan and providing strong waterproof and dustproof capabilities. Furthermore, the replaceable plug supports quick switching between multiple interfaces, adapting to different audio devices. The dual-mode switching audio cable allows for one-button switching between "equalization mode" and "style mode," catering to different music genre needs. Simultaneously, the multi-layer shielding structure effectively blocks electromagnetic interference and signal transmission loss, enhancing the headphone's versatility, durability, and personalization upgrade potential.

[0016] 4. This invention features intelligent and efficient interaction, balancing personalized experience and user comfort. It supports operations such as song skipping, pause / play, and noise reduction mode switching without the need for additional buttons. The optional Bluetooth 5.3 adapter supports LC3 encoding and NFC quick pairing. With the mobile app, users can customize the sound quality according to their preferences. The low-power control circuit extends the battery life in Bluetooth mode, meeting the needs of long-term use and balancing intelligent functions with battery life.

[0017] 5. This invention uses temperature-sensitive silicone earplugs that adapt to the ear canal temperature for a comfortable fit. The skin-friendly antibacterial coating on the surface reduces discomfort and bacterial growth while improving sealing performance. The shell offers three material options: carbon fiber composite, stabilized wood, and engineering plastic, balancing lightweight design with structural rigidity and reducing resonance interference. The damping adjustment plate in the sound cavity inside the shell can dynamically adapt to acoustic impedance, further optimizing sound quality under different wearing conditions, achieving a dual guarantee of "comfortable wearing" and "superior listening experience".

[0018] 6. This invention integrates multiple innovative technologies such as dual-unit collaborative drive, adaptive acoustic adjustment, enhanced replaceable cable, and intelligent interaction, comprehensively solving the shortcomings of traditional headphones in terms of full-frequency sound quality, noise reduction adaptability, ease of use, and personalized experience. It not only meets the core needs of high-end audio users for high-fidelity sound quality, but also adapts to diverse scenarios such as daily commuting, office work, and music appreciation. The product has obvious differentiated advantages and has broad market application prospects and significant commercial value. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a partial cross-sectional view of the earphone shell in this invention.

[0020] In the diagram: 1. Earphone shell; 2. Driver unit; 3. Signal processing module; 4. Acoustic channel; 5. Earbud; 6. Replaceable cable interface; 7. Audio cable; 8. Replaceable plug. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figure 1 and Figure 2 As shown, one embodiment of the present invention proposes: a replaceable cable high-fidelity noise-canceling in-ear headphone based on Knowles armature driver, including headphone shell 1, driver unit 2, signal processing module 3, earplug 5 and audio cable 7; The driving unit 2 is a 5-unit 4-way hybrid driving module, adopting a "1 dynamic, 3 iron, 1 bone conduction" structure. It is coaxially set in the receiving chamber inside the earphone shell 1. It includes a 10mm magnesium-aluminum alloy diaphragm dynamic driver unit, a Knowles TWFK-30017 imported Knowles iron unit, a Knowles ED-29689 Knowles iron unit, an auxiliary Knowles iron unit, and a 10mm high-vibration bone conduction unit. Each unit works together through a physical crossover structure and an electronic crossover circuit to achieve a reasonable allocation of low, mid, high, and ultra-high frequency bands. At the same time, a phase synchronization circuit is used to achieve multi-unit signal coordination and eliminate frequency band transition distortion. Among them, the 10mm magnesium-aluminum alloy diaphragm dynamic coil unit adopts a high magnetic energy product neodymium iron boron magnetic circuit, and the diaphragm is rigidly reinforced. It is responsible for the low frequency range (20Hz-500Hz) output, improving the low frequency depth and elasticity. Among them, the KnowlesTWFK-30017 Knowles ferrite driver unit features an optimized magnetic gap design and a composite bio-fiber diaphragm, responsible for mid-frequency reproduction (500Hz-5kHz), ensuring accurate and natural mid-frequency details of vocals and instruments; Among them, the Knowles ED-29689 Knowles ferroelectric unit: adopts a reinforced magnetic circuit and ultra-thin diaphragm structure, responsible for the high frequency range (5kHz-15kHz) extension, improving high frequency resolution and clarity; Among them, the auxiliary Knowles iron-driven unit: supplements the ultra-high frequency range (15kHz-40kHz) and enhances the reproduction of ultra-high frequency details; Among them, the 10mm high-vibration bone conduction unit adopts a piezoelectric ceramic driving structure, which works in synergy with the acoustic unit to enhance the stereo effect of the sound field and low-frequency vibration feedback, thereby improving the immersive listening experience.

[0023] The signal processing module 3 integrated inside the earphone shell 1 includes an integrated high-performance DSP chip and an active noise cancellation (ANC) chip; The DSP chip performs real-time frequency response compensation and phase calibration for the acoustic characteristics of the 5-unit 4-way crossover, and combined with the electronic crossover algorithm, it precisely adjusts the gain of the entire frequency band from 20Hz to 40kHz to ensure smooth connection of each unit. Among them, the ANC chip, together with the matching miniature MEMS microphone array (2 feedforward microphones + 1 feedback microphone), realizes a hybrid noise reduction mode of passive noise reduction and active noise reduction, and can dynamically switch between three levels of noise reduction: light, medium and deep, according to the intensity of ambient noise.

[0024] The earphone shell 1 has an internal acoustic cavity, which is connected to the acoustic channel 4 on the shell. The acoustic cavity includes a spiral main acoustic channel and an adaptive damping secondary channel. The spiral main acoustic channel has a width of 2.5-3mm, with a 2-2.5mm thick high-density rubber noise reduction patch attached to the inner wall, and a 4-5mm thick sound-absorbing fiber filled at the bottom to reduce sound wave reflection interference. The adaptive damping sub-channel incorporates a damping adjustment plate made of shape memory alloy. The opening and closing angle of the damping plate (0°-45°) is controlled by current heating to achieve dynamic adjustment of acoustic impedance and adapt to different frequency band sound quality requirements.

[0025] The earbud 5 is detachably placed at the port of the acoustic channel 4. It is made of temperature-sensitive silicone material with a temperature response range of 25-40℃. The surface is covered with a skin-friendly antibacterial coating, which softens and fits the ear canal according to the temperature, improving the sealing performance and wearing comfort, and improving the passive noise reduction base value by 3-5dB. The audio cable 7 is a dual-mode switching audio cable. Its core conductor contains spiral pure silver wire and has a built-in miniature switching switch. The core conductor is a 216-core single-crystal copper-silver hybrid braided wire, which is hand-braided with 6 strands. It combines the warm mid-frequency of single-crystal copper with the high-resolution high-frequency of silver wire. The middle section of the wire integrates a 30-35cm long spiral pure silver conductor with a spiral diameter of 4-5mm and a wire diameter of 0.25-0.3mm. It also has a built-in micro switch that can realize one-button switching between "equalization mode: copper-silver hybrid transmission" and "style mode: silver wire dominates high frequency / copper wire dominates low frequency" to adapt to different music types. The audio cable 7 is wrapped with a multi-layer shielding structure, including a polyimide insulation layer, a copper braided shielding layer, an aluminum foil shielding layer, and a TPE wear-resistant outer sheath, which are wrapped from the inside out. The copper braided shielding layer has a coverage of 95%, which effectively blocks electromagnetic interference and radio frequency interference and reduces signal transmission loss. One end of the audio cable 7 is connected to the replaceable cable interface 6 on the headphone shell 1, and the other end is provided with a replaceable plug 8; The replaceable cable interface 6 is integrated on the earphone shell 1, with a 0.78 mm double-pin (2-pin) flat female connector fixed inside. The female connector has a built-in ring magnetic positioning structure and a fluororubber sealing gasket. The pins are made of gold-plated rhodium alloy, which increases the insertion and removal life to more than 5,000 times. It also has IPX5 waterproof and dustproof capabilities and forms an electrical connection with Knowles iron-loaded unit and miniature dynamic unit. Among them, the replaceable plug 8 adopts a "three-in-one" detachable plug base and is equipped with three plug modules: 3.5mm single-ended, 2.5mm balanced, and 4.4mm balanced. The plug contacts adopt a gold-plated + rhodium layer composite process, with a plug-in / plug-out cycle of ≥3000 times. The base has a built-in anti-misinsertion positioning groove, which can be quickly replaced without tools.

[0026] The earphone shell 1 also integrates a smart interaction module including a touch sensing unit, a wireless interaction module, and a low-power control circuit. Among them, the touch sensing unit is a capacitive touch sensor integrated on the side of the earphone shell 1, which supports single click to skip songs, double click to pause / play, and long press to adjust the noise reduction mode. The noise reduction modes are: light, medium, deep and transparent, with a response time of ≤100ms. The wireless interaction module is an optional Bluetooth adapter that supports Bluetooth 5.3 and LC3 codecs. The kit has a built-in lithium battery and NFC quick pairing function, with a battery life of 8 hours. Users can customize EQ parameters (5-band equalizer adjustment), store 3 user sound effect presets, and check headphone status (battery level, plug type, noise cancellation level) via a mobile APP. The low-power control circuit uses a low-power MCU chip with a standby power consumption of ≤5μA. When used with a Bluetooth kit, the total battery life can reach 24 hours, including charging case recharge. The headphones have a frequency response range of 15-40kHz, total harmonic distortion ≤1.2%, impedance of 10-12Ω, and sensitivity of 111-113dB.

[0027] The earphone shell 1 is made of one of three materials: carbon fiber composite material, stable wood, and high-strength engineering plastic. The carbon fiber version weighs ≤8g, increases rigidity by 30%, and reduces resonance interference. The carbon fiber version has the following specifications: impedance 11Ω, sensitivity 112dB, frequency response range 15Hz-40kHz, and total harmonic distortion (THD) ≤1.0%. Among them, the stabilized wood version has the following characteristics: impedance 10Ω, sensitivity 113dB, frequency response range 15Hz-40kHz, and total harmonic distortion (THD) ≤0.8%; Among them, the engineering plastic version has the following characteristics: impedance 12Ω, sensitivity 111dB, frequency response range 18Hz-38kHz, and total harmonic distortion (THD) ≤1.2%; The noise reduction performance of the headphones is as follows: 25-30dB noise reduction in the low frequency band (50-500Hz), 28-32dB noise reduction in the mid frequency band (500-2000Hz), 22-26dB noise reduction in the high frequency band (2000-8000Hz), and ambient sound gain ≤3dB in transparency mode.

[0028] Example 1: Carbon fiber outer shell This system employs a 5-unit combination: a 10mm magnesium-aluminum alloy diaphragm dynamic driver, a Knowles TWFK-30017 Knowles TWFK-30017 Knowles TWFK-30017 Knowles TWFK-30019 Knowles TWFK-30689 Knowles TWFK-30689 Knowles TWFK-30689, an auxiliary Knowles TWFK-30689, and a 10mm high-vibration bone conduction unit. All units are coaxially mounted within a carbon fiber composite housing. The main acoustic chamber has a 3mm width, a 2.5mm thick noise-reducing patch, and a 5mm thick sound-absorbing fiber filling. The secondary channel damping adjustment plate has an initial angle of 15°. The magnetically sealed 2-pin female connector features a built-in fluororubber gasket, with insertion and extraction forces controlled between 5-8N.

[0029] The standard package includes a 1.2-meter dual-mode switching audio cable, featuring a core of 6-strand 216-core single-crystal copper-silver hybrid wire. The spiral pure silver conductor is 35cm long, with a spiral diameter of 5mm and a wire diameter of 0.3mm. The switching switch is located in the middle of the cable near the splitter. The tri-mode interchangeable plugs include a 3.5mm single-ended plug and a 2.5mm balanced plug, with gold-plated rhodium alloy contacts.

[0030] The DSP chip is ADAU1787, the ANC chip is TPS65988, the MEMS microphone array has a sampling rate of 48kHz, and the noise reduction mode switching response time is ≤200ms. The touch sensor supports four basic operations. There is no Bluetooth adapter. The performance parameters meet the carbon fiber version standard.

[0031] Example 2: The outer shell is made of stable wood. It employs a 5-unit combination: a 10mm magnesium-aluminum alloy diaphragm dynamic driver, a Knowles TWFK-30017 Knowles TWFK-30017 Knowles TWFK-30017 Knowles TWFK-30019 ...9689 Knowles TWFK-30019 Knowles TWFK-30689 Knowles TWFK-30689 Auxiliary Knowles TWFK-30689 AWFK-30689 AWFK-30689 AWFK-30689 AWFK-30689 A

[0032] The standard package includes a 1.3-meter dual-mode switching audio cable, featuring a 6-strand 216-core single-crystal copper-silver hybrid cable. The spiral pure silver conductor is 30cm long, with a spiral diameter of 4mm and a wire diameter of 0.25mm. The switching switch is located in the middle of the cable near the branch point. The "three-in-one" interchangeable plug includes 3.5mm single-ended, 2.5mm balanced, and 4.4mm balanced modules, with gold-plated rhodium alloy contacts.

[0033] The DSP chip is ADAU1787, the ANC chip is TPS65988, the MEMS microphone array has a sampling rate of 48kHz, and the noise cancellation mode switching response time is ≤200ms. It offers optional Bluetooth 5.3 adapter (with a built-in 100mAh lithium battery), supports LC3 encoding and NFC pairing, and features a mobile app for 5-band EQ adjustment, 3 sets of sound effect storage, and customizable noise cancellation levels. It offers 8 hours of single-ear playback and a total playback time of 24 hours with the charging case.

[0034] Example 3: The outer shell is made of engineering plastic. The system employs a 5-unit combination: a 10mm magnesium-aluminum alloy diaphragm dynamic driver, a Knowles TWFK-30017 Knowles TWFK-30017 Knowles TWFK-30017 Knowles TWFK-30017 Knowles TWFK-30019 ...9689 Knowles TWFK-30019 Auxiliary Knowles TWFK-30019 Knowles TWFK-30019 Knowles TWFK-30019 Knowles TW

[0035] The standard package includes a 1.3-meter dual-mode switching audio cable. The audio cable is made of 4 strands of 216-core single-crystal copper-silver hybrid braid, with a 32cm long spiral pure silver conductor. The tri-mode plug only offers 3.5mm single-ended and 2.5mm balanced options. It lacks a Bluetooth kit, retaining only basic touch control functions (track skipping, pause / play). Performance parameters meet engineering plastic standards, and it weighs ≤7g, making it suitable for everyday portable use.

[0036] The headphones of this invention performed as follows after testing: Sound quality performance: The frequency response curve is smooth, with complete coverage of the 15Hz-40kHz frequency band. The low frequency extension reaches 12Hz (-3dB), the mid frequency error is ±1.0dB, the high frequency extends to 42kHz, the total harmonic distortion (THD) of the whole frequency band is ≤1.0%, the dual-unit collaboration has no frequency band gaps, and the sound field stereo effect is improved by 40% compared with the single-unit design.

[0037] Noise reduction performance: In hybrid noise reduction mode, the peak noise reduction is 30dB in the low frequency band, 32dB in the mid frequency band, and 26dB in the high frequency band. In transparency mode, the ambient sound reproduction is ≥90% with no obvious distortion.

[0038] Durability: The contact resistance of the replaceable cable interface changes by ≤0.01Ω after 5000 plug-in / plug-out cycles; the cable remains unbroken after 10000 bends (90° angle); and the casing remains structurally intact and performs stably after high and low temperature tests (-20℃ to 60℃) and humidity tests (95%RH).

[0039] Intelligent experience: Touch response accuracy ≥98%, APP connection distance ≤10m, sound effect presets are stored without loss, and audio latency in Bluetooth mode is ≤50ms (LC3 encoding).

[0040] This invention overcomes the limitations of single-unit sound quality through a dual-unit collaborative driving structure, achieves dynamic adaptation of noise reduction and sound quality through an adaptive acoustic adjustment system, enhances durability and personalization upgrade space through a reinforced replaceable cable design, and enriches usage scenarios through an intelligent interaction module. It comprehensively solves the shortcomings of existing headphones in terms of full-frequency balance, noise reduction adaptability, and convenience, and meets the diverse needs of high-end users for high-fidelity sound quality, flexible use, and intelligent experience. It has significant technological innovation advantages and broad market application prospects.

[0041] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A replaceable-cable high-fidelity noise-canceling in-ear headphone based on Knowles armature drivers, comprising an earphone shell (1), a driver unit (2), a signal processing module (3), ear tips (5), and an audio cable (7), characterized in that: The drive unit (2) is a 5-unit 4-frequency hybrid drive module, including a 10mm magnesium-aluminum alloy diaphragm dynamic coil unit, a Knowles TWFK-30017 imported Knowles iron dynamic unit, a Knowles ED-29689 Knowles iron dynamic unit, an auxiliary Knowles iron dynamic unit, and a 10mm strong vibration bone conduction unit, which achieves signal coordination through a phase synchronization circuit; The earphone shell (1) has an internal acoustic cavity, which is connected to the acoustic channel (4) on the shell. The acoustic cavity includes a spiral main acoustic channel and an adaptive damping secondary channel. The secondary channel has a built-in damping adjustment plate made of shape memory alloy. The earplug (5) is detachably mounted at the port of the acoustic channel (4); The audio cable (7) is a dual-mode switching audio cable, with a core conductor containing spiral pure silver wire and a built-in miniature switching switch; The earphone shell (1) also integrates a signal processing module (3) and an intelligent interaction module; One end of the audio cable (7) is connected to the replaceable cable interface (6) provided on the earphone shell (1), and the other end is provided with a replaceable plug (8).

2. The replaceable cable high-fidelity noise-canceling in-ear headphone based on Knowles armature driver as described in claim 1, characterized in that: In the 5-unit 4-frequency hybrid drive module of the drive unit (2), the 10mm magnesium-aluminum alloy diaphragm moving coil unit adopts a high magnetic energy product neodymium iron boron magnetic circuit, and the diaphragm is rigidly reinforced and is responsible for low-frequency output. Knowles TWFK-30017 Knowles ferrite driver unit, combined with composite bio-fiber diaphragm, provides excellent mid-frequency reproduction; The Knowles ED-29689 Knowles ferroelectric driver employs a reinforced magnetic circuit and an ultra-thin diaphragm structure to handle high-frequency extension. The auxiliary Knowles iron-driven unit is designed to supplement the ultra-high frequency band; The 10mm high-vibration bone conduction unit adopts a piezoelectric ceramic drive structure, which works in conjunction with the acoustic unit.

3. The replaceable cable high-fidelity noise-canceling in-ear headphone based on Knowles armature driver as described in claim 1, characterized in that: The inner wall of the spiral main acoustic channel formed in the upper acoustic cavity of the earphone shell (1) is attached with a high-density rubber noise reduction patch, and the bottom is filled with sound-absorbing fiber; The damping adjustment plate located in the adaptive damping sub-channel can be controlled by electric heating or by APP to adjust its opening and closing angle.

4. A replaceable-cable high-fidelity noise-canceling in-ear headphone based on a Knowles armature driver as described in claim 1, characterized in that: The replaceable connector (6) adopts a magnetically sealed double-needle structure, with a built-in annular magnetic positioning structure and a fluororubber sealing gasket, and the pin is made of gold-plated rhodium alloy.

5. A replaceable-cable high-fidelity noise-canceling in-ear headphone based on a Knowles armature driver as described in claim 1, characterized in that: The core conductor of the audio cable (7) is a 216-core single-crystal copper-silver braided cable, and the built-in miniature switch can switch between "equalization mode" and "style mode".

6. A replaceable-cable high-fidelity noise-canceling in-ear headphone based on a Knowles armature driver as described in claim 1, characterized in that: The replaceable plug (8) is a "three-in-one" replaceable plug system, which is compatible with 3.5mm single-ended, 2.5mm balanced and 4.4mm balanced plugs. The contacts are made of gold-plated rhodium alloy composite process.

7. A replaceable-cable high-fidelity noise-canceling in-ear headphone based on a Knowles armature driver as described in claim 1, characterized in that: The intelligent interaction module integrated inside the earphone shell (1) includes a capacitive touch sensor and can be equipped with a Bluetooth 5.3 adapter.

8. A replaceable-cable high-fidelity noise-canceling in-ear headphone based on a Knowles armature driver as described in claim 1, characterized in that: The earplug (5) is made of temperature-sensitive silicone material and has a skin-friendly antibacterial coating on its surface. The earphone shell (1) is made of one of three materials: carbon fiber composite, stable wood, or engineering plastic.

9. The in-ear headphones according to any one of claims 1-8, characterized in that: Frequency response range 15-40kHz, total harmonic distortion ≤1.2%, impedance 10-12Ω, sensitivity 111-113dB.

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