Automatic audio detection equipment

Abstract

The invention provides audio automatic detection equipment, and relates to the technical field of audio detection. The audio automatic detection equipment comprises a to-be-tested sound source assembly, and further comprises an air nozzle configured to provide air flow required by a wind noise test for the sound source assembly, and the air nozzle is in fluid communication with a pump set through an air guide pipeline; the artificial ear assembly is correspondingly arranged under the wind nozzle, a main body of the artificial ear assembly is a tubular outer shell, a limiting bayonet is formed in the top end of the outer shell and used for fixing the sound source assembly to be detected, and an audio detection piece is arranged in the bottom end of the outer shell to collect acoustic signals of the sound source assembly in the wind noise environment. According to the invention, a fitting degree quantification structure of deformation of the elastic soft film is matched with an airflow channel switching structure driven by the reversing plug, a test condition close to a real use scene is constructed, the structure can accurately reproduce actual working conditions of earphone wearing loosening and airflow interference, a multi-factor coupling test of ANC intervention and airflow injection under a fitting gap is realized, and the test efficiency is improved. And the influence degree of the airflow on the ANC noise reduction effect and the tone quality is quantified.

Description

An automatic audio detection device Technical Field

[0001] This invention relates to the field of audio detection technology, specifically to an automatic audio detection device. Background Technology

[0002] With the rapid development of consumer electronics technology, headphones have become a core portable audio device for daily commutes, work, and entertainment. Audio quality and noise cancellation performance have gradually become core indicators for users when making purchases. Therefore, accurate audio testing technology has become a crucial link in the research and development and mass production of headphones. Taking an artificial ear kit with authorization publication number CN118200835B as an example, it mainly connects the inside of the artificial ear to a noise-free environment through an equalization pressure guiding unit. This achieves air pressure balance while isolating external noise interference, improving the accuracy of noise-canceling headphone testing. However, this technology mainly focuses on testing basic noise cancellation effects and does not address the coupled testing needs of complex wearing scenarios and active noise cancellation (ANC) performance and sound quality.

[0003] Active Noise Cancellation (ANC) technology is a core feature of mid-to-high-end headphones. Its working principle involves the headphone's built-in microphone collecting ambient noise, which is then analyzed in real-time by a processor to generate compensating sound waves with the opposite phase and the same amplitude as the noise. These compensated sound waves are then released through the speaker to cancel out the ambient noise, providing users with a quiet listening environment. Due to the increasingly urgent need for noise isolation in commuting and office scenarios, ANC technology, which effectively isolates low-to-mid-frequency noise such as traffic rumble and office noise, has rapidly become widespread in various headphone products. The stability of ANC noise cancellation and its balance with audio quality directly determine a product's market competitiveness. Therefore, accurate testing of ANC performance has become a crucial aspect of headphone R&D and quality control. The authenticity and comprehensiveness of the test results directly affect product optimization and market acceptance.

[0004] However, in real-world usage scenarios, it's difficult to maintain an ideal seal and fit when wearing headphones. Factors such as ear canal shape differences, wearing methods, and movement can lead to loosening and gaps between the headphones and the ear canal. To address this, some high-end headphones are equipped with pressure-sensing units that can detect loosening and automatically increase ANC (Active Noise Cancellation) intensity to maintain noise reduction. However, increasing ANC intensity often comes at the cost of some audio quality, potentially causing audio distortion, frequency response curve shifts, and a decrease in signal-to-noise ratio. Existing headphone testing equipment often focuses on testing a single metric under ideal, sealed conditions, or can only independently test ANC noise reduction and audio quality. It cannot simulate the dynamic changes in fit during actual wear, nor can it accurately quantify the correlation between changes in fit, ANC adjustment, and sound quality loss. This makes it difficult for developers to obtain comprehensive coupled test data, hindering targeted optimization of ANC algorithms and product structure design.

[0005] Therefore, there is an urgent need for a new type of artificial ear canal device that can simulate changes in actual wearing fit and achieve coupling detection of ANC performance and sound quality. Summary of the Invention

[0006] Addressing the shortcomings of existing technologies, this invention provides an automatic audio detection device that utilizes a quantifiable structure based on the deformation of an elastic soft diaphragm, combined with an airflow path switching structure driven by a commutator, to construct test conditions closely resembling real-world usage scenarios. This quantifies the impact of airflow on ANC noise reduction and sound quality, providing intuitive data support for ANC algorithm optimization and shell sealing design, thereby improving the headphones' adaptability to actual user experience. Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution: an automatic audio detection device, comprising a sound source component to be tested, and further comprising: a nozzle configured to provide airflow required for wind noise testing to the sound source component, the nozzle being fluidly connected to a pump unit via an air duct; an artificial ear component, correspondingly disposed directly below the nozzle, the main body of which is a tubular outer shell, the top of the outer shell having a limiting bayonet for fixing the sound source component to be tested, and the bottom having an internal audio detection element for collecting acoustic signals of the sound source component under wind noise conditions; wherein, the bayonet adopts an inner and outer coaxial nested structure, including a fixing sleeve and a sealing test tube, the fixing sleeve axially covering the sound source component. The sound-emitting part forms a directional constraint channel for acoustic signal acquisition. The sealed test tube is sleeved on the outer periphery of the fixed sleeve, and its inner wall is circumferentially fitted with the outer shell of the sound source assembly. Multiple sets of elastic diaphragms that can elastically deform outward are arranged at intervals along the axial direction on the tube wall of the sealed test tube. The artificial ear assembly also includes a three-way pipe fixed to the outer wall of the outer shell. The first interface of the three-way pipe is connected to the inner cavity of the outer shell, and the second interface is connected to the soundproof box through the sound guide pipe. When the sound source assembly and the bayonet are engaged and fixed, the inner cavity of the outer shell is acoustically isolated from the external test environment. At the same time, the three-way pipe keeps the inner cavity of the outer shell and the soundproof box stably connected.

[0008] Preferably, a threaded tube assembly, including a cross-threaded tube, is coaxially nested within the inner cavity of the outer shell. A sliding sleeve is also slidably fitted onto the outer wall of the outer shell, and several through-type guide windows are evenly distributed circumferentially on the upper half of the outer shell. Several spirally distributed threaded grooves are machined on the outer wall of the cross-threaded tube, and several balls are embedded and installed on the inner wall of the sliding sleeve corresponding to the positions of each guide window. Preferably, each ball passes through the guide window of the outer shell and rolls into the threaded groove on the outer wall of the cross-threaded tube to form a transmission pair. When the cross-threaded tube rotates around its axis, the threaded groove drives the sliding sleeve to slide axially downward along the outer wall of the outer shell through rolling engagement with the balls. Each elastic diaphragm of the sealing test tube is connected to a corresponding pull rope between itself and the upper end face of the sliding sleeve. When the sliding sleeve slides axially downward, the pull rope applies a radially outward pulling force to the elastic diaphragm, driving the elastic diaphragm to deform outward.

[0009] Preferably, the audio detection component includes: an interface, the bottom of which is elastically supported by a spring at the bottom of the inner cavity of the housing, and a sealed sliding connection is formed between the outer wall of the interface and the inner wall of the housing, which allows the interface to slide adaptively along the axial direction of the housing and achieves an acoustic seal between the interface and the inner wall of the housing, blocking the transmission of external noise to the inner cavity; a sound transmission rod, the bottom end of which is rigidly connected to the signal acquisition end at the top of the interface, forming an axial transmission channel for acoustic signals; and a sound transmission diaphragm, which is fixed to the top of the sound transmission rod as an acoustic signal sensing end, for directly sensing the acoustic vibration signal of the sound-generating part of the sound source component; wherein, the inner wall of the housing extends radially into its inner cavity to form several radial support ribs, and the inner end of each radial support rib slides against the outer wall of the sound transmission rod to limit the radial movement of the sound transmission rod.

[0010] Preferably, an inner tube is rotatably fitted to the inner wall of the cross-threaded tube. The inner wall of the cross-threaded tube and the outer wall of the inner tube are each evenly provided with a plurality of protruding keys and grooves. The protruding keys and keyways form a matching limiting pair, allowing the protruding keys and keyways to engage with each other when the cross-threaded tube is subjected to axial pressure, thus achieving circumferential limiting of the cross-threaded tube and the inner tube. A fixed threaded tube is also fixedly connected to the inner wall of the outer shell. The inner wall of the fixed threaded tube is machined with internal threads, and the outer wall of the inner tube is correspondingly machined with external threads. The two are screwed together to form a threaded mating pair. A turntable is rotatably fitted to the bottom end of the inner tube. The bottom of the turntable extends axially downwards through the connection section between the fixed threaded tube and the outer shell, and its end is coaxially fixedly connected to a compression tube. The lower end face of the compression tube flexibly abuts against the upper end face of the interface of the audio detection component.

[0011] Preferably, the top end of the cross-threaded tube is rotatably connected to a bearing tube via a bearing, the bearing tube is axially limited and slidably connected to the inner wall of the outer shell, and an elastic soft membrane is coaxially sealed between the top end of the bearing tube and the bottom end of the fixed sleeve. The sound-transmitting diaphragm, the elastic soft membrane, the inner wall of the fixed sleeve, and the outer wall of the sound-emitting part of the sound source component together form a cavity.

[0012] Preferably, the third interface of the three-way conduit is acoustically connected to the external test environment of the artificial ear assembly. A reversing plug is axially slidably sealed in the inner cavity of the three-way conduit. A bifurcated flow channel is machined inside the reversing plug. The flow channel can achieve selective connection between the first interface and the second or third interface through the axial sliding of the reversing plug.

[0013] Preferably, the upper inner wall of the outer shell is elastically connected to the sliding sealing assembly via a return spring. The sliding sealing assembly includes a spring plate and a wedge-shaped sleeve, and the entire assembly is axially limited and slidably connected along the inner wall of the outer shell. The return spring between the spring plate and the upper inner wall of the outer shell is always in a pre-tightened state. The bottom end of the spring plate is coaxially fixed to the wedge-shaped sleeve via multiple axial shafts evenly distributed circumferentially. The wedge-shaped sleeve is sleeved on the outside of the sound transmission rod, and the end of the reversing plug extending into the inner cavity of the outer shell forms a wedge-shaped mating pair with the outer wall of the wedge-shaped sleeve with a sloped guide. The relative sliding of the sloped surfaces drives the spring plate and the wedge-shaped sleeve to slide downward.

[0014] Preferably, an airflow guiding channel is formed circumferentially between the inner wall of the sealing test tube and the outer wall of the fixed sleeve. Several exhaust ports are evenly opened circumferentially on the tube wall of the sealing test tube and are all connected to the airflow guiding channel. Several connecting slots are opened on the tube wall of the fixed sleeve corresponding to the positions of the airflow guiding channel. A sealing plug is fixedly connected to the top of the spring plate. When the sliding sealing kit is in the initial position, the sealing plug is engaged with the connecting slot to achieve sealing and blocking of the connecting slot.

[0015] This invention provides an automatic audio testing device. It possesses the following technical highlights and beneficial effects: The device utilizes a quantifiable fitting structure based on the deformation of an elastic soft diaphragm, combined with an airflow path switching structure driven by a commutator, to construct test conditions closely resembling real-world usage scenarios. This structure can accurately reproduce the actual working conditions of loose earphone fit and airflow interference, enabling multi-factor coupled testing of ANC intervention and airflow inflow under fitting gaps. This quantifies the impact of airflow on ANC noise reduction and sound quality, providing intuitive data support for ANC algorithm optimization and shell sealing design, and improving the earphone's adaptability to actual user experience.

[0016] The coaxial positioning and sealing structure with double-layer bayonet is combined with the sealed sliding connection between the interface and the outer shell. At the same time, the constant-flow design between the silent box and the outer shell forms a stable test environment protection system. This structure can achieve precise clamping of the audio source components, while achieving acoustic isolation and air pressure balance in the test environment. The controllable loosening design of the bayonet can simulate the sound quality reduction caused by loose wearing of the headphones, thereby optimizing the subsequent design of the headphones.

[0017] The dual-mode adjustment structure with cross-threaded tubes, combined with the path switching structure of three-way tubes and reversing plugs, and the linkage sealing structure of wedge sleeves and sealing plugs, achieves integrated coverage of multiple test scenarios. This structure can complete the requirements of conventional audio testing, eardrum distance influence testing, and coupling testing of ANC intervention and airflow interference under fit gap on the same platform without the need for additional devices or disassembly of audio source components, and can quickly switch test conditions. Attached Figure Description

[0018] Figure 1 is a structural schematic diagram of the present invention; Figure 2 is a structural schematic diagram of the artificial ear assembly in the present invention; Figure 3 is an isometric side sectional view of the artificial ear assembly in the present invention; Figure 4 is an enlarged schematic diagram of point A in Figure 3; Figure 5 is a schematic diagram of the cooperation between the sliding sealing kit and the reversing plug in the present invention; Figure 6 is a schematic diagram of the cooperation structure between the sliding sleeve, the connecting rope, and the sealing test tube in the present invention; Figure 7 is an isometric side sectional view of the lower half of the artificial ear assembly in the present invention; Figure 8 is an isometric side sectional view of the internal structure of the artificial ear assembly in the present invention; Figure 9 is an enlarged schematic diagram of point B in Figure 8; Figure 10 is a partial isometric side sectional view of the sliding sleeve and the cross-threaded tube in the present invention; Figure 11 is an enlarged schematic diagram of point C in Figure 10.

[0019] The components include: 1. Air nozzle; 2. Sound source assembly; 3. Artificial ear assembly; 4. Bayonet; 32. T-junction; 33. Outer shell; 34. Audio detection component; 35. Sliding sleeve; 36. Reversing plug; 37. Threaded tube assembly; 38. Sliding sealing kit; 39. Pull rope; 310. Ball bearing; 312. Sealing test tube; 342. Sound transmission diaphragm; 343. Interface; 371. Cross threaded tube; 372. Inner tube; 373. Extrusion tube; 374. Elastic diaphragm; 375. Fixed threaded tube; 376. Bearing tube; 381. Sealing plug; 382. Spring plate; 383. Wedge sleeve. Detailed Implementation

[0020] 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.

[0021] Example 1, as shown in Figures 1, 3, 4, and 7, provides an automatic audio detection device, including a sound source component 2 to be tested, and further including: a nozzle 1 configured to provide airflow required for wind noise testing to the sound source component 2, the nozzle 1 being fluidly connected to a pump group through an air duct; and an artificial ear component 3, correspondingly positioned directly below the nozzle 1, the artificial ear component 3 having a tubular outer shell 33, a limiting slot 31 at the top of the outer shell 33 for fixing the sound source component 2 to be tested, and an audio detection element 34 built into the bottom to collect the acoustic signal of the sound source component 2 in a wind noise environment, the audio detection element 34 including: an interface 343. The bottom of the interface 343 is elastically supported by a spring at the bottom of the inner cavity of the outer shell 33. A sealed sliding connection pair is formed between the outer wall of the interface 343 and the inner wall of the outer shell 33, which allows the interface 343 to slide adaptively along the axial direction of the outer shell 33 and can also achieve an acoustic seal between the interface and the inner wall of the outer shell, blocking the transmission of external noise to the inner cavity. The bottom end of the sound transmission rod 342 is rigidly connected to the signal acquisition end at the top of the interface 343, forming an axial transmission channel for acoustic signals. The sound transmission diaphragm 341 is fixed at the top of the sound transmission rod 342 as an acoustic signal sensing end, and is used to directly sense the acoustic vibration signal of the sound source component 2.

[0022] Regarding the detection principle of the audio detection component 34: The sound transmission diaphragm 341 is used to monitor the occurrence of sound source component 2. When the sound source component 2 emits sound, the vibration generated by it drives the sound transmission diaphragm 341 to vibrate. The interface 343 has a built-in signal conversion module. After receiving the mechanical vibration transmitted by the sound transmission rod 342, its signal acquisition end converts it into an electrical signal corresponding to the vibration frequency and amplitude, and finally outputs it to the outside through the interface for analysis by the subsequent testing system.

[0023] As shown in Figures 2 and 4, the bayonet 31 adopts an inner and outer coaxial nested structure, including a fixed sleeve 311 and a sealing test tube 312. The fixed sleeve 311 covers the sound-emitting part of the sound source component 2 along the axial direction to form a directional constraint channel for acoustic signal acquisition. The sealing test tube 312 is sleeved on the outer periphery of the fixed sleeve 311, and its inner wall is circumferentially fitted with the outer shell of the sound source component 2. Multiple sets of elastic diaphragms that can elastically deform outward are arranged at intervals along the axial direction on the tube wall of the sealing test tube 312. Through the controllable separation of the elastic diaphragms, the specific impact of the degree of looseness of the earphone wearing on the sound quality is simulated.

[0024] As shown in Figure 2, the artificial ear assembly 3 also includes a three-way pipe 32 fixed to the outer wall of the outer shell 33. The first interface of the three-way pipe 32 is connected to the inner cavity of the outer shell 33, and the second interface is connected to the soundproof box through the sound guide pipe. When the sound source assembly 2 and the bayonet 31 are engaged and fixed, the inner cavity of the outer shell 33 is acoustically isolated from the external test environment. At the same time, the inner cavity of the outer shell 33 and the soundproof box are stably connected through the three-way pipe 32. The soundproof box connected by the three-way pipe 32 is partially connected to the inner cavity of the outer shell 33. At this time, the gas inside the outer shell 33 is connected to the gas inside the soundproof box, balancing the air pressure inside the artificial ear assembly 3. At the same time, the static pressure box provides a gas environment that isolates external sound sources, thereby ensuring the audio detection quality.

[0025] Example 2, as shown in Figures 3, 6, 10, and 11, provides another technical solution based on Example 1. A threaded tube assembly 37, including a cross-threaded tube 371, is coaxially nested within the inner cavity of the outer shell 33. A sliding sleeve 35 is also slidably fitted onto the outer wall of the outer shell 33. Several through-type guide windows are evenly distributed circumferentially on the upper half of the outer shell 33. Several spirally distributed threaded grooves are machined on the outer wall of the cross-threaded tube 371. Several ball bearings 310 are embedded and installed on the inner wall of the sliding sleeve 35 corresponding to the positions of each guide window. The ball 310 passes through the guide window of the outer shell 33 and rolls into the threaded groove on the outer wall of the cross-threaded tube 371 to form a transmission pair. When the cross-threaded tube 371 rotates around its axis, the threaded groove drives the sliding sleeve 35 to slide axially downward along the outer wall of the outer shell 33 through rolling engagement with the ball 310. When the cross-threaded tube 371 is rotated alone, the ball 310 on the sliding sleeve 35 will roll along the cross-threaded groove on the cross-threaded tube 371. Since the sliding sleeve 35 and the outer shell 33 are in a limiting sliding engagement relationship, the sliding sleeve 35 will gradually slide downward.

[0026] As shown in Figure 6, each elastic diaphragm of the sealing test tube 312 is connected to a pull rope 39 between it and the upper end face of the sliding sleeve 35. When the sliding sleeve 35 slides axially downward, the pull rope 39 applies a radially outward pulling force to the elastic diaphragm, driving the elastic diaphragm to deform outward. In turn, the sliding sleeve 35 pulls the elastic soft membrane on the sealing test tube 312, causing the elastic soft membrane to deform outward.

[0027] As shown in Figures 8 and 9, an inner tube 372 is rotatably fitted to the inner wall of the cross-threaded tube 371. Several protruding keys and grooves are evenly distributed on the inner wall of the cross-threaded tube 371 and the outer wall of the inner tube 372, respectively. The protruding keys and keyways form a matching limiting pair, allowing the protruding keys and keyways to engage with each other when the cross-threaded tube 371 is subjected to axial pressure, thus achieving circumferential limiting of the cross-threaded tube 371 and the inner tube 372. A fixed threaded tube 375 is also fixedly connected to the inner wall of the outer shell 33. The inner wall of the fixed threaded tube 375 is machined with internal threads, and the outer wall of the inner tube 372 is correspondingly machined with external threads. The two are screwed together to form a threaded mating pair. The bottom end of the inner tube 372 is rotatably fitted with... The turntable extends axially downwards from its bottom, penetrating the connection between the fixed threaded tube 375 and the outer shell 33, and its end is coaxially fixedly connected to the extrusion tube 373. The lower end face of the extrusion tube 373 flexibly abuts against the upper end face of the interface 343 of the audio detection component 34. The top end of the cross threaded tube 371 is rotatably connected to the bearing tube 376 through the bearing. The bearing tube 376 is axially limited and slidably connected to the inner wall of the outer shell 33. The top end of the bearing tube 376 and the bottom end of the fixed sleeve 311 are coaxially sealed and connected to the elastic soft diaphragm 374. The sound transmission diaphragm 341, the elastic soft diaphragm 374, the inner wall of the fixed sleeve 311 and the outer wall of the sound-emitting part of the sound source component 2 together form a cavity.

[0028] Example 3, as shown in Figure 3, provides another technical solution based on Examples 1 and 2. The third interface of the three-way pipe 32 is acoustically connected to the external test environment of the artificial ear assembly 3. The inner cavity of the three-way pipe 32 is axially slidably sealed with a reversing plug 36. The reversing plug 36 is machined with a bifurcated flow channel. The flow channel can achieve selective connection between the first interface and the second or third interface through the axial sliding of the reversing plug 36.

[0029] As shown in Figures 3, 4, and 5, the upper inner wall of the outer casing 33 is elastically connected to the sliding sealing assembly 38 via a return spring. The sliding sealing assembly 38 includes a spring plate 382 and a wedge-shaped sleeve 383, and the entire assembly is axially limited and slidably connected along the inner wall of the outer casing 33. The return spring between the spring plate 382 and the upper inner wall of the outer casing 33 is always in a pre-tightened state. The bottom end of the spring plate 382 is coaxially fixed to the wedge-shaped sleeve 383 via multiple axial shafts evenly distributed circumferentially. The wedge-shaped sleeve 383 is sleeved on the outside of the sound transmission rod 342, and the end of the reversing plug 36 extending into the inner cavity of the outer casing 33 forms a wedge-shaped mating pair with a sloped guide with the outer wall of the wedge-shaped sleeve 383. The spring plate 38 is driven by the relative sliding of the sloped surfaces. 2. The wedge-shaped sleeve 383 slides downward. The inner wall of the sealing test tube 312 and the outer wall of the fixed sleeve 311 are circumferentially arranged to form an airflow guiding channel. Several exhaust ports are evenly opened circumferentially on the wall of the sealing test tube 312 and are all connected to the airflow guiding channel. Several connecting slots are opened on the wall of the fixed sleeve 311 corresponding to the position of the airflow guiding channel. The top of the spring plate 382 is fixedly connected to the sealing plug 381. When the sliding sealing kit 38 is in the initial position, the sealing plug 381 is engaged with the connecting slot to seal the connecting slot. The end of the reversing plug 36 squeezes the wedge-shaped sleeve 383, and the spring plate 382 drives the sealing plug 381 to slide downward, so that the airflow flows into the interior of the outer shell 33 through the channel.

[0030] Working Principle: This audio testing device is specifically designed for audio quality testing during the headphone testing phase. During testing, the sound source component 2 is engaged in the bayonet 31. The bayonet 31 employs a double-layer engagement structure, ensuring that the sound source component 2's generating portion is completely submerged inside the artificial ear component 3. During the routine audio testing phase, the sound source component 2 emits sound normally. At this time, the audio detection component 34 built into the artificial ear component 3 can detect the audio emitted by the sound source component 2. To prevent ambient noise from interfering with the audio detection, the three-way pipe 32 connects to the silencing chamber and the inner cavity of the outer shell 33. The gas inside the outer shell 33 is connected to the gas inside the silencing chamber, balancing the air pressure inside the artificial ear component 3. Simultaneously, the static pressure chamber provides a gaseous environment that isolates external sound sources, thereby ensuring audio detection quality. Furthermore, to investigate the relationship between audio quality and eardrum distance, the bottom of the cross-threaded tube 371 can be pressed, utilizing the convex key to engage the groove, ensuring that the cross-threaded tube 371 and the inner tube 372 rotate synchronously. At this time, the inner tube 372 will screw into the fixed threaded tube 375. Externally, the cross-threaded tube 371 rotates downwards. Since the cross-threaded grooves on the outside of the cross-threaded tube 371 rotate downwards synchronously, the sliding sleeve 35 will not be driven to move. While the cross-threaded tube 371 and the inner tube 372 rotate downwards, the pushing and squeezing tube 373 and the interface 343 move downwards, thereby driving the sound-transmitting diaphragm 341 to move downwards. At this time, the sound-transmitting diaphragm 341 is also moved, causing the distance between the sound source and the sound-transmitting diaphragm 341 to change. By using the monitoring parameters between the sound source and the sound-transmitting diaphragm 341 at different distances, the influence of the eardrum distance on key audio indicators such as the headphone frequency response curve, signal-to-noise ratio, and distortion can be accurately quantified. This provides direct and reliable experimental data support for the research and development of headphone sound unit structural layout optimization and acoustic cavity design. At the same time, the entire distance adjustment process does not require disassembly of the sound source component 2, ensuring that the detection process is in a uniform environment, avoiding the introduction of additional environmental interference or clamping errors during the adjustment process, and ensuring that the monitoring data at different distances have strict comparability and accuracy.

[0031] When monitoring the noise cancellation effect of the headphones, the pump is turned on, and airflow is blown out from the nozzle 1, causing wind noise around the audio source component 2. At the same time, the noise cancellation mode of the headphones is turned on. When testing the noise cancellation effect of the headphones on one side, the headphones do not play audio, and the internal cavity of the outer shell 33 remains connected to the silent box. The audio detection component 34 detects the sound noise inside the outer shell 33 and couples it with the external noise coefficient to obtain the noise cancellation effect of the headphones. At the same time, the headphones play audio while the noise cancellation mode is turned on, thereby detecting the impact of the noise cancellation effect on the sound quality.

[0032] Meanwhile, considering that the earphone cannot always be in contact with the ear canal during normal use, to detect the earphone sound quality under such circumstances, the cross-threaded tube 371 can be rotated independently. At this time, the ball bearing 310 on the sliding sleeve 35 will roll along the cross-threaded groove on the cross-threaded tube 371. Since the sliding sleeve 35 and the outer shell 33 have a limiting sliding fit relationship, the sliding sleeve 35 will gradually slide downwards. Then, the sliding sleeve 35 pulls the elastic diaphragm on 312, causing the elastic diaphragm to deform outwards. Based on the deformation of the elastic diaphragm, the fit rate between the earphone and the artificial ear assembly 3 can be obtained. At this time, the airflow will flow through the earphone shell except for the sound-producing part. At this time, the outer shell 33 still remains connected to the silent box, that is, the audio detection component 34 detects that the earphone is fully ANC. The sound quality during intervention is accurately measured to determine the degree of interference of airflow into the headphone's ANC performance. Then, maintaining the deformation of the elastic diaphragm, the commutator 36 is pressed, connecting the third interface to the first interface. Simultaneously, the end of the commutator 36 presses against the wedge-shaped sleeve 383, causing the sealing plug 381 to slide downwards via the spring plate 382, ​​allowing airflow to flow into the housing 33 through the channel. At this point, the audio detection component 34 detects the impact of airflow into the ear canal on the headphone's sound quality during ANC intervention. By comparing two sets of detection data, the degree of sound quality loss caused by excessive ANC intervention can be accurately quantified. This provides researchers with an intuitive basis for interference assessment in the context of a tight fit, precisely guiding the optimization direction of the ANC algorithm.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic audio detection device, comprising a sound source component (2) to be tested, characterized in that, Also includes: A nozzle (1) is configured to provide airflow required for wind noise testing to the sound source component (2). The nozzle (1) is fluidly connected to the pump group through a duct. An artificial ear component (3) is positioned directly below the nozzle (1). Its main body is a tubular outer shell (33). The top of the outer shell (33) is provided with a limiting slot (31) for fixing the sound source component (2) under test. The bottom is equipped with an audio detection element (34) to collect the acoustic signal of the sound source component (2) in a wind noise environment. The slot (31) adopts an inner and outer coaxial nesting structure, including a fixing sleeve (311) and a sealing test tube (312). The fixing sleeve (311) covers the sound-emitting part of the sound source component (2) along the axial direction to form a directional constraint channel for acoustic signal acquisition. The sealing test tube (312) is sleeved on the outer periphery of the fixed sleeve (311), and its inner wall is circumferentially fitted with the outer shell of the sound source assembly (2). Multiple sets of elastic diaphragms that can elastically deform outward are arranged at intervals along the axial direction on the tube wall of the sealing test tube (312). The artificial ear assembly (3) also includes a three-way pipe (32) fixed to the outer wall of the outer shell (33). The first interface of the three-way pipe (32) is connected to the inner cavity of the outer shell (33), and the second interface is connected to the soundproof box through the sound guide pipe. When the sound source assembly (2) and the bayonet (31) are locked together, the inner cavity of the outer shell (33) is acoustically isolated from the external test environment. At the same time, the inner cavity of the outer shell (33) and the soundproof box are stably connected through the three-way pipe (32).

2. The automatic audio detection device according to claim 1, characterized in that, A threaded tube assembly (37) is coaxially nested in the inner cavity of the outer shell (33), including a cross-threaded tube (371). A sliding sleeve (35) is also slidably sleeved on the outer wall of the outer shell (33). Several through-type guide windows are evenly opened circumferentially in the upper half of the outer shell (33). Several spirally distributed threaded grooves are processed on the outer wall of the cross-threaded tube (371). Several ball bearings (310) are embedded and installed on the inner wall of the sliding sleeve (35) corresponding to the positions of each guide window. Each ball bearing (310) passes through the guide window of the outer shell (33) and rolls. A transmission pair is formed in the threaded groove on the outer wall of the cross-threaded tube (371). When the cross-threaded tube (371) rotates around its axis, the threaded groove drives the sliding sleeve (35) to slide axially downward along the outer wall of the outer shell (33) by rolling engagement with the ball (310). Each elastic diaphragm of the sealing test tube (312) is connected to a pull rope (39) between it and the upper end face of the sliding sleeve (35). When the sliding sleeve (35) slides axially downward, the pull rope (39) applies a radially outward pulling force to the elastic diaphragm, driving the elastic diaphragm to deform outward.

3. The automatic audio detection device according to claim 2, characterized in that, The audio detection component (34) includes: an interface (343), the bottom of which is elastically supported by a spring at the bottom of the inner cavity of the outer shell (33), and a sealed sliding connection pair is formed between the outer wall of the interface (343) and the inner wall of the outer shell (33), which allows the interface (343) to slide adaptively along the axial direction of the outer shell (33) and can also achieve an acoustic seal between the interface and the inner wall of the outer shell, blocking the transmission of external noise to the inner cavity; a sound transmission rod (342), the bottom end of which is rigidly connected to the signal acquisition end at the top of the interface (343), forming an axial transmission channel for acoustic signals; a sound transmission diaphragm (341), which is fixed at the top of the sound transmission rod (342) as an acoustic signal sensing end, and is used to directly sense the acoustic vibration signal of the sound source component (2); wherein, the inner wall of the outer shell (33) extends radially into its inner cavity to form several radial support ribs, and the inner end of each radial support rib slides against the outer wall of the sound transmission rod (342) to limit the radial movement of the sound transmission rod (342).

4. The automatic audio detection device according to claim 3, characterized in that, An inner tube (372) is rotatably fitted to the inner wall of the cross-threaded tube (371). Several protruding keys and grooves are evenly distributed on the inner wall of the cross-threaded tube (371) and the outer wall of the inner tube (372). The protruding keys and grooves form a matching limiting pair, causing the protruding keys and grooves to engage with each other when the cross-threaded tube (371) is subjected to axial pressure, thus achieving circumferential limiting of the cross-threaded tube (371) and the inner tube (372). A fixed threaded tube (372) is also fixedly connected to the inner wall of the outer shell (33). 5) The inner wall of the fixed threaded tube (375) is machined with an internal thread, and the outer wall of the inner tube (372) is machined with an external thread. The two are screwed together to form a threaded mating pair. The bottom end of the inner tube (372) is rotatably fitted with a turntable. The bottom of the turntable extends axially downward through the connection section between the fixed threaded tube (375) and the outer shell (33), and its end is coaxially fixed to a compression tube (373). The lower end face of the compression tube (373) is flexibly abutted against the upper end face of the interface (343) of the audio detection component (34).

5. The automatic audio detection device according to claim 4, characterized in that, The top end of the cross-threaded tube (371) is rotatably connected to a bearing tube (376) via a bearing. The bearing tube (376) and the inner wall of the outer shell (33) are axially limited and slidably connected. The top end of the bearing tube (376) and the bottom end of the fixed sleeve (311) are coaxially sealed and connected with an elastic soft membrane (374). The sound-transmitting diaphragm (341), the elastic soft membrane (374), the inner wall of the fixed sleeve (311) and the outer wall of the sound-emitting part of the sound source assembly (2) together form a cavity.

6. The automatic audio detection device according to claim 1, characterized in that, The third interface of the three-way pipe (32) is acoustically connected to the test environment outside the artificial ear assembly (3). The inner cavity of the three-way pipe (32) is axially slidably sealed with a reversing plug (36). The reversing plug (36) is internally machined with a bifurcated flow channel. The flow channel can achieve selective connection between the first interface and the second or third interface through the axial sliding of the reversing plug (36).

7. An automatic audio detection device according to claim 6, characterized in that, The upper inner wall of the outer shell (33) is elastically connected to the sliding sealing kit (38) by a reset spring. The sliding sealing kit (38) includes a spring plate (382) and a wedge sleeve (383), and the whole is axially limited and slidably connected along the inner wall of the outer shell (33). The reset spring between the spring plate (382) and the upper inner wall of the outer shell (33) is always in a pre-tightened state. The bottom end of the spring plate (382) is coaxially fixed with the wedge sleeve (383) through multiple axial shafts evenly distributed in the circumference. The wedge sleeve (383) is sleeved on the outside of the sound transmission rod (342), and the end of the reversing plug (36) extending into the inner cavity of the outer shell (33) forms a wedge-shaped mating pair with inclined surface guidance with the outer wall of the wedge sleeve (383). The relative sliding of the inclined surface drives the spring plate (382) and the wedge sleeve (383) to slide downward.

8. The automatic audio detection device according to claim 7, characterized in that, An airflow guiding channel is formed circumferentially between the inner wall of the sealing test tube (312) and the outer wall of the fixed sleeve (311). Several exhaust ports are evenly opened circumferentially on the wall of the sealing test tube (312) and are all connected to the airflow guiding channel. Several connecting slots are opened on the wall of the fixed sleeve (311) corresponding to the position of the airflow guiding channel. A sealing plug (381) is fixedly connected to the top of the spring plate (382). When the sliding sealing kit (38) is in the initial position, the sealing plug (381) fits into the connecting slot to achieve sealing and blocking of the connecting slot.

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