CN210843053U - Be applied to audio signal collection system that pulmonary function detected - Google Patents

Abstract

The utility model relates to an audio signal collection system for pulmonary function detects, including a hollow interior casing, be provided with air inlet and gas outlet on the interior casing, interior inside at least gas circuit that is provided with of casing, each gas circuit all feeds through air inlet and gas outlet, and one of them gas circuit is main gas circuit, and other gas circuits are the side gas circuit, are provided with the dog on main gas circuit, and a sound wave conduction hole has been seted up on the dog towards the lateral wall of interior casing one side at the one end upper reaches of air inlet, sound wave conduction hole next-door neighbour dog, interior casing outside is provided with one with sound wave conduction hole just right audio collector. The utility model discloses the sound wave that the collection tester was blown the detector and is sent, consequently need not use hot type flowmeter in the aspect of data acquisition to greatly reduced the manufacturing cost of detector, so that the popularization of detector.

Description

Be applied to audio signal collection system that pulmonary function detected

The technical field is as follows:

the utility model relates to an audio signal collection system for pulmonary function detects.

Background art:

the lung function detection is one of necessary examinations of respiratory system diseases, is mainly used for detecting the unobstructed degree of a respiratory tract and the size of lung capacity, and has important clinical values in the aspects of early detection of lung and airway lesions, assessment of disease severity and prognosis of disease, evaluation of curative effect of drugs or other treatment methods, identification of respiratory difficulty reasons, diagnosis of lesion parts, assessment of tolerance of lung functions to operations or labor intensity tolerance, monitoring of critically ill patients and the like.

The lung function detection adopts the thermal flowmeter to detect the flow and the flow speed of the exhaled gas of a tester in a hospital, the flow and the flow speed data of the exhaled gas of the tester are collected, the data are analyzed through a computer to obtain lung function parameters, the thermal flowmeter adopted in the hospital is expensive again, the thermal flowmeter cannot be popularized according to families, respiratory system diseases caused by atmospheric pollution are high, if a lung function detector with the same price as the thermal flowmeter can be provided, the thermal flowmeter can be popularized, the lung function detector can be used for monitoring the lung functions of people at any time, the lung function parameters are discovered to be abnormal, the patient can be in time treated, and the respiratory system diseases are prevented from being worsened.

The utility model has the following contents:

the utility model discloses the technical problem that will solve is: the utility model provides an audio signal collection system for pulmonary function detects, the device simple structure, low in production cost can popularize, and the crowd of being convenient for gathers self pulmonary function data to supply the pulmonary function analysis device based on audio signal to carry out the analysis and reachs the pulmonary function parameter.

In order to solve the technical problem, the utility model discloses a technical scheme is: be applied to audio signal collection system that pulmonary function detected, including a hollow interior casing, be provided with air inlet and gas outlet on the interior casing, interior inside at least gas circuit that is provided with of casing, each gas circuit all communicates air inlet and gas outlet, and one of them gas circuit is main gas circuit, and other gas circuits are the side gas circuit, are provided with the dog on the main gas circuit, set up the sound wave conduction hole of a intercommunication main gas circuit on the lateral wall of interior casing one side on dog upper reaches, sound wave conduction hole next-door neighbour dog, interior casing outside is provided with an audio collector just right with sound wave conduction hole.

As a preferred scheme, the upstream section of the main gas path is a compression section which is gradually narrowed, the downstream section of the main gas path is an air cavity with the width not smaller than that of the compression section, a high-pressure nozzle is formed at the joint of the compression section and the air cavity of the main gas path, and the stop block is arranged in the air cavity and is opposite to the high-pressure nozzle.

As a preferred scheme, the interior of the inner shell is divided into three air paths by two clapboards, the air path between the two clapboards is a main air path, and the tail end of the main air path is communicated with the air outlet after being converged with the side air path.

As a preferable scheme, the interior of the inner shell is divided into a plurality of air paths by an isolating pipe arranged along the air flow direction and a connecting plate uniformly distributed on the outer wall of the isolating pipe in the circumferential direction, one end, far away from the isolating pipe, of the connecting plate is connected with the inner wall of the inner shell, the air path positioned in the isolating pipe is a main air path, the air path positioned outside the isolating pipe is a side air path, the isolating pipe comprises a conical pipe positioned at the upstream and a straight pipe sleeved outside the downstream end of the conical pipe, the opening area of the upstream end of the conical pipe is larger than that of the downstream end, the straight pipe is sleeved to the upstream end of the straight pipe from the downstream end of the conical pipe and is abutted against the outer wall of the conical pipe, the outer wall of the downstream end of the straight pipe extends outwards in the radial direction to form a supporting plate, one end, far away from the straight pipe, an air cavity is formed inside the straight pipe at the downstream of the conical pipe, the downstream end of the conical pipe is a high-pressure nozzle, the stop block is positioned in the air cavity and connected with the inner wall of the straight pipe, and the pipe wall of the straight pipe at the upstream side of the stop block is provided with an extension hole which penetrates through the support plate and is communicated with the sound wave guide hole in the side wall of the inner shell.

As a preferred scheme, a groove is formed in one face, opposite to the high-pressure nozzle, of the stop block, the groove is opposite to the high-pressure nozzle, and the sound wave conduction hole is close to the bottom of the groove.

As a preferable scheme, the air cavity is divided into two branch air paths by the stop block, and the sum of the flow areas of the narrowest parts of the two branch air paths is smaller than the area of an opening of the main air path at one end of the air inlet.

Preferably, the partitions on both sides of the high-pressure nozzle are convex in shape.

Preferably, the stop block is annular, an inner hole of the stop block is formed by connecting a straight hole section positioned at the upstream and a conical hole section positioned at the downstream, a downstream opening of the conical hole section is smaller than an upstream opening, an upstream end face of the stop block is a conical surface facing the outside of the stop block, the upstream end face of the stop block is intersected with an inner side face of the stop block to form a sharp annular edge, and the annular edge is opposite to the high-pressure nozzle or is positioned in a diffusion area of airflow sprayed by the high-pressure nozzle.

As a preferable scheme, a signal sending component for sending the audio signal collected by the audio collector is further arranged outside the inner shell.

As a preferred scheme, the audio collector comprises a sound collector, a circuit board and an output data line which are connected with each other, and the signal sending component comprises a processor connected with the output data line, a power supply connected with the processor and a wireless signal transmitting module.

The utility model has the advantages that: the utility model discloses gather the sound wave that the tester was blown and is sent to the detector to sound wave frequency and amplitude are as detecting the data source, provide the pulmonary function analytical equipment based on audio signal and carry out the analysis and reach the pulmonary function parameter, consequently need not use the thermal type flowmeter in the aspect of data acquisition, thereby greatly reduced the manufacturing cost of detector, so that the popularization of detector.

The utility model discloses further through setting main gas circuit to compression section, air cavity and high pressure nozzle, make the gas that enters into main gas circuit by compression stroke high-pressure gas before assaulting the dog, high-pressure gas assaults the dog and can send bigger sound wave to make the audio signal who gathers more obvious.

The utility model discloses further set up the recess on the dog to make gaseous shock in the recess, further improve the audio signal who gathers, the noise that produces outside the separation recess simultaneously.

The utility model discloses further flow area through the branch gas circuit of control makes the inside certain atmospheric pressure that keeps of air cavity, avoids the sound wave signal to run off at the excessive speed, reinforcing audio signal's collection plumpness.

The utility model discloses further through setting up the side gas circuit to ensure that unnecessary air current smoothly discharges, reduce the expiratory resistance, avoid producing the gas jam.

The utility model discloses further design into most advanced protruding form through the baffle that will be located high pressure nozzle both sides to eliminate the baffle and to the drainage effect that breaks away from the air current of high pressure nozzle, reduce the loss of high pressure nozzle spun air current, further strengthen sound wave signal.

The utility model discloses further through setting up signal transmission subassembly (power, treater and radio signal emission module), can realize being connected with analytical equipment's wireless communication.

The utility model discloses further adopt annular baffle, utilize the arris of baffle upper reaches end to make sound, make the audio signal of the gaseous maximum velocity of flow (PEF) of collection system collection more clear.

Description of the drawings:

the following detailed description of embodiments of the present invention is provided with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view of a half-section structure of the present invention;

FIG. 2 is a sectional view A-A of FIG. 1;

FIG. 3 is a schematic structural diagram of an audio signal acquisition device using wired communication;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;

FIG. 5 is a schematic structural diagram of another embodiment of the present invention;

fig. 6 is a schematic structural diagram of a collecting device adopting an annular stopper on the basis of fig. 5.

In fig. 1 to 6: 1. inner shell, 2, air inlet, 3, air outlet, 4, main air passage, 4-1, compression section, 4-2, air cavity, 4-3, high-pressure nozzle, 5, side air passage, 6, stop block, 6-1, groove, 7, sound wave guide hole, 8, branch air passage, 9, audio collector, 9-1, sound pick-up, 9-2, circuit board, 9-3, output data line, 10, power supply, 11, processor, 12, wireless signal transmitting module, 13, partition board, 14, fixed outer shell, 15, installation cavity, 16, assembly hole, 17, winding post, 18, storage chamber, 19, movable housing, 20, audio analysis device, 21, wire guide hole, 22, signal transmitting component, 23, isolation tube, 23-1, conical tube, 23-2, straight tube, 24, connecting plate, 25, supporting plate, 26, Extension hole, 27, straight hole section, 28, taper hole section, 29, conical surface, 30, arris.

The specific implementation mode is as follows:

the following describes in detail a specific embodiment of the present invention with reference to the drawings.

Example 1:

as shown in fig. 1 and 2, the audio signal acquisition device applied to lung function detection includes a hollow inner housing 1, an air inlet 2 and an air outlet 3 are arranged on the inner housing 1, the interior of the inner housing 1 is separated into three air paths by two partition plates 13, the air path between the two partition plates 13 is a main air path 4, the other air paths are side air paths 5, each air path is communicated with the air inlet 2 and the air outlet 3, the tail end (namely, the downstream end) of the main air path 4 is communicated with the air outlet 3 after being converged with the side air path 5, and the three air paths can be communicated with the air outlet 3 without being converged at the downstream end; the upstream section of the main gas path 4 is a compression section 4-1 which is gradually narrowed, the downstream section is an air cavity 4-2 with the width larger than that of the compression section 4-1, a high-pressure nozzle 4-3 is formed at the joint of the compression section 4-1 of the main gas path 4 and the air cavity 4-2, a stop block 6 is arranged in the air cavity 4-2, and the stop block 6 is opposite to the high-pressure nozzle 4-3. The baffle 6 is fixedly connected with two side walls of the inner shell 1, branch air channels 8 are formed on two sides of the baffle 6, a sound wave conducting hole 7 is formed in the side wall of one side of the inner shell 1, facing the upper stream of one end of the air inlet 2, of the baffle 6, the sound wave conducting hole is close to the baffle 6, as shown in fig. 2, an audio collector 9 opposite to the sound wave conducting hole 7 is arranged outside the inner shell 1, and the audio collector 9 is in communication connection with an audio analysis device 20.

In the specific implementation process, the width of the air cavity 4-2 can be adjusted according to actual needs, and the width of the air cavity can also be consistent with the width of the compression section 4-1.

One surface of the stop block 6, which is opposite to the high-pressure nozzle 4-3, is provided with a groove 6-1, the groove 6-1 is opposite to the high-pressure nozzle 4-3, and the sound wave guide hole 7 is closely adjacent to the bottom of the groove 6-1.

Although the sound emission is realized by the stopper 6 facing the high-pressure nozzle 4-3 in this embodiment, the sound emission may be realized by the annular stopper 6.

The stop block 6 divides the air cavity 4-2 into two branch air paths 8, and the sum of the flow areas of the narrowest parts of the two branch air paths 8 is smaller than the opening area of the main air path 4 at one end of the air inlet 2.

As shown in fig. 2, a signal sending component 22 for sending the audio signal collected by the audio collector 9 to the audio analysis device 20 in a wireless manner is further disposed outside the inner housing 1, the signal sending component is composed of a power source 10, a processor 11, and a wireless signal transmitting module 12, the audio collector 9 and the wireless signal transmitting module 12 are respectively electrically connected to the processor 11, the power source 10 is used for providing electric energy to the processor 11, the audio collector 9 and the wireless signal transmitting module 12, and the processor 11 sends the audio signal to the audio analysis device 20 through the wireless signal transmitting module 12.

As shown in fig. 1, the partitions 13 located on both sides of the high-pressure nozzle 4-3 are convex-pointed.

As shown in fig. 2, a fixed outer shell 14 is connected to the outer wall of one side of the inner shell 1, in which the sound wave conduction hole 7 is formed, a mounting cavity 15 is formed inside the fixed outer shell 14, the audio collector 9 is arranged in the mounting cavity 15, an assembly hole 16 opposite to the sound wave conduction hole 7 is formed in the side wall of one side, opposite to the fixed outer shell 14 and the inner shell 1, of the sound collector 9, the sound collector 9-1 is fixedly arranged in the assembly hole 16, a storage chamber 18 is arranged on the inner shell 1, a line passing hole 21 communicated with the storage chamber 18 is formed in the fixed outer shell 14, and the power supply 10, the processor 11 and the wireless signal transmitting module 12 are all arranged in the storage chamber 18.

The audio collector 9 is a microphone and is composed of a sound collector 9-1, a circuit board 9-2 and an output data line 9-3, the output data line 9-3 is connected to the circuit board 9-2, as shown in fig. 2, the circuit board 9-2 is fixedly connected in the mounting cavity 15, one end of the sound collector 9-1 is inserted into the assembling hole 16 while being electrically connected with the circuit board, and the output data line 9-3 penetrates through the wire passing hole 21 to be electrically connected with the processor 11.

A movable cover 19 covering the storage chamber 18 is provided on the outer wall of the other side of the inner housing 1, and one end of the movable cover 19 is hinged with the inner housing 1 or the fixed outer housing 14.

In the present embodiment, the partition plate 13 has a hollow structure, which can increase the intensity of the sound wave generated when the high-pressure air flow impacts the partition plate 13, and at the same time, can block the sound wave downstream of the partition plate 13, thereby reducing noise.

In the above embodiment, the audio collector 9 is in communication connection with the audio analysis device 20 in a wireless communication manner through the signal sending component 22, that is, through the power supply 10, the processor 11 and the wireless signal transmitting module 12, in a specific implementation process, the communication connection may also be implemented in a wired connection manner, and the specific connection structure is as follows: as shown in fig. 3 and 4, a fixed outer housing 14 is connected to an outer wall of one side of the inner housing 1, which is provided with the sound wave conducting hole 7, a mounting cavity 15 is provided inside the fixed outer housing 14, the audio collector 9 is disposed in the mounting cavity 15, an assembly hole 16, which is opposite to the sound wave conducting hole 7, is formed on a side wall of the fixed outer housing 14, which is opposite to the inner housing 1, a sound pickup 9-1 of the audio collector 9 is fixedly mounted in the assembly hole 16, a winding post 17 is further connected to an outer wall of one side of the fixed outer housing 14, which faces the inner housing 1, a storage chamber 18 corresponding to the winding post 17 is provided on the inner housing 1, the winding post 17 is inserted into the storage chamber 18, an annular winding space is formed between the storage chamber 18 and the winding post 17, a wire passing hole 21, which is communicated with the storage chamber 18, is provided on the fixed outer housing 14, an output data wire 9-3 of, stored in the winding space.

The utility model discloses the theory of operation is: as shown in fig. 1 and 2, a tester blows air into an air inlet 2 of a signal acquisition device through a mouth, the blown air is divided into three paths, two paths flow from a side air path 5 to an air outlet 3, and one path flows from a main air path 4 to the air outlet 3, wherein the air flow of the side air path 5 is not considered, the air flow in the main air path 4 is pressurized through a compression section 4-1 to form high-pressure air flow, the high-pressure air flow is sprayed into an air chamber 4-2 from a high-pressure nozzle 4-3 and collides with a stop block 6 arranged in the air chamber 4-2 to generate sound waves, the sound waves are transmitted outwards through a sound wave transmission hole 7, the transmitted sound waves are acquired by an audio acquisition device 9, when a wireless signal emission module 12 is not installed in the signal acquisition device, the audio acquisition device 9 is directly butted with an audio analysis device 20 through an output data line 9-3, and the audio signals are directly input into the, after receiving the audio signal, the audio analyzer 20 performs data processing and analysis according to the audio signal to obtain lung function parameters of the tester, such as FEV1(FEV1 is the volume of the air volume exhaled by the first second of the maximum exhalation after the maximum deep inhalation), PEF (maximum exhalation flow, which is the instantaneous flow rate when the exhalation flow rate is the fastest in the forced vital capacity determination process, also called peak exhalation flow rate, which mainly reflects the strength of respiratory muscles and the absence of obstruction in the airway), and FEV1/FVC (FVC: forced vital capacity, FVC) is the past time vital capacity, which is the maximum air volume exhaled as soon as possible after the maximum inhalation is performed.

When the signal acquisition device is installed with the wireless signal transmitting module, the audio signal is firstly transmitted to the processor 11, and the processor 11 controls the wireless signal transmitting module 12 to transmit the audio signal to the audio analysis device 20 in a wireless communication mode.

In the present embodiment, the audio analysis device 20 is a calculator, a mobile phone, a tablet computer, or the like, which is equipped with analysis software capable of calculating lung function parameters of the tester based on the audio signal, and is used for software installation and data processing analysis.

Example 2:

the audio signal acquisition device applied to lung function detection as shown in fig. 5 comprises a hollow inner shell 1, an air inlet 2 and an air outlet 3 are arranged on the inner shell 1, the inner part of the inner shell 1 is divided into a plurality of air paths by an isolation tube 23 arranged along the air flow direction and a connecting plate 24 uniformly distributed on the outer wall of the isolation tube 23 in the circumferential direction, one end of the connecting plate 24 far away from the isolation tube 23 is connected with the inner wall of the inner shell 1, wherein the air path positioned inside the isolation tube 23 is a main air path 4, the air path positioned outside the isolation tube 23 is a side air path 5, the isolation tube 23 is composed of a conical tube 23-1 positioned at the upstream and a straight tube 23-2 sleeved outside the downstream end of the conical tube 23-1, the opening area of the upstream end of the conical tube 23-1 is larger than that of the downstream end, the straight tube 23-2 is sleeved to the upstream end of the straight tube 23-2 from the downstream end of, the outer wall of the downstream end of the straight pipe 23-2 extends radially outwards to form a supporting plate 25, one end, away from the straight pipe 23-2, of the supporting plate 25 is connected with the inner shell 1, the downstream end of the straight pipe 23-2 is located at the downstream of the downstream end of the conical pipe 23-1, a compression section 4-1 is formed in the conical pipe 23-1, an air cavity 4-2 is formed in the straight pipe 23-2 at the downstream of the conical pipe 23-1, the downstream end of the conical pipe 23-1 is a high-pressure nozzle 4-3, the stop block 6 is located in the air cavity 4-2 and is connected with the inner wall of the straight pipe 23-2, and an extension hole 26 which penetrates through the supporting plate 25 and is communicated with the sound wave transmission hole 7 in the side wall of.

As shown in fig. 5, the stopper 6 is fixedly connected to the top wall of the straight tube 23-2, the lower end of the stopper 6 is suspended, a branch gas channel 8 is formed between the stopper 6 and the straight tube 23-2, the stopper 6 is opposite to the high pressure nozzle 4-3, an extension hole 26 is formed on the top wall of the straight tube 23-2 on the upstream side of the stopper 6, the extension hole 26 passes through a support plate 25 on the outer top surface of the straight tube 23-2 and extends to the sound wave guide hole 7 on the top wall of the inner housing 1, the outer part of the inner housing 1 is connected with a fixed outer housing 14 covering the sound guide hole 7, and an audio collector 9 opposite to the sound guide hole 7 is.

In this embodiment, the side of the stop 6 facing the high pressure nozzle 4-3 is a plane, and in the implementation process, the side of the stop facing the high pressure nozzle 4-3 may also be a rib or a combination of a rib and a plane, and the audio signal acquisition device applied to the lung function detection as shown in fig. 6 adopts a structure that sounds with a rib.

As shown in fig. 6, in the present technical solution, the stopper 6 is annular, an inner hole thereof is the branch gas path 8, the inner hole is formed by connecting a straight hole section 27 located at the upstream and a tapered hole section 28 located at the downstream, and the downstream opening of the tapered hole section 28 is smaller than the upstream opening, so as to avoid the rapid loss of the sound wave. The end face of the upstream end of the stop block 6 is a conical surface 29 facing the outside of the stop block 6, the conical surface 29 and the inner wall of the straight pipe 23-2 are in arc surface transition, the end face of the upstream end of the stop block 6 is intersected with the inner side surface of the stop block to form a sharp annular edge 30, and the annular edge 30 is opposite to the high-pressure nozzle 4-3 or is positioned in a diffusion area of airflow sprayed by the high-pressure nozzle 4-3.

In this embodiment 2, the transmission manner of the sound wave signal collected by the audio collector 9 to the audio analysis device 20 is the same as that in embodiment 1, and details are not repeated here, and the specific installation manner of the audio collector 9 and the signal sending component 22 may be determined according to the specific structure of the signal collection device.

In the present embodiment 2, the inner housing 1, the straight tube 23-2 and the support plate 25 can be integrally formed to simplify the coupling structure.

The working principle of this embodiment 2 is similar to that of embodiment 1, a user blows air into the inner housing 1 from the air inlet 2, a part of the air enters the main air passage 4, is compressed into high-pressure air in the compression section 4-1, is sprayed out through the high-pressure nozzle 4-3 to enter the air cavity 4-2, impacts on the blocking surface or the edge of the stop 6, and makes a sound, the sound is transmitted to the outside of the inner housing 1 through the extension hole 26 and the sound wave transmission hole 7, and is collected by the sound collector 9-1 of the audio collector 9 in the fixed outer housing 14, and the audio collector 9 sends an audio signal to the audio analysis device through the signal sending component 22.

The method for detecting the lung function based on the audio signal acquisition device comprises the steps of firstly sending an audio signal acquired by an audio acquisition device to an audio analysis device 20, forming a sound power and time map by the audio analysis device 20, further calculating values of lung function test items FEV1 ', PEF' and FEV1 '/FVC' based on the relation between the sound power and the time, then converting the values of the lung function test items FEV1 ', PEF' and FEV1 '/FVC' based on the audio into values of lung function test items FEV1, PEF and FEV1/FVC based on the gas flow according to a proportionality coefficient, and finally obtaining lung function data of a detector.

Each of the above lung function test items based on audio has a corresponding proportionality coefficient, and the method for determining the proportionality coefficient corresponding to each test item is the same.

Firstly, a thermal flowmeter lung function detection device and an audio signal acquisition device are connected in series, then a plurality of persons are tested, a pattern of exhalation flow and time obtained by the detection of the thermal flowmeter lung function detection device by the plurality of persons and a pattern of sound power and time obtained by the detection of an audio acquisition device by the plurality of persons are collected, PEF and PEF 'of each person are respectively calculated, then proportional coefficients k1, k2 and k3 … … kn between the PEF and the PEF' of each person are calculated through the PEF/PEF ', the proportional coefficients of the PEF and the PEF' calculated by each person may be different, therefore, an average proportional coefficient k0 is calculated to be used as the proportional coefficient between the final PEF and the PEF ', and when the proportional coefficients are used, the PEF is equal to PEF' k 0.

The calculation methods of the proportional coefficients corresponding to the other two test items are the same as above, and are not described herein again.

The above embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments in use, and are not intended to limit the invention; it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications belong to the protection scope of the present invention.

Claims (9)

1. Be applied to audio signal collection system that pulmonary function detected, a serial communication port, including a hollow interior casing (1), be provided with air inlet (2) and gas outlet (3) on interior casing (1), interior casing (1) inside is provided with an at least gas circuit, each gas circuit all communicates air inlet (2) and gas outlet (3), one of them gas circuit is main gas circuit (4), other gas circuits are side gas circuit (5), be provided with dog (6) on main gas circuit (4), set up sound wave conduction hole (7) of a intercommunication main gas circuit (4) on the lateral wall of interior casing (1) one side on dog (6) upper reaches, sound wave conduction hole (7) next-door neighbour dog (6), interior casing (1) outside is provided with one and sound wave conduction hole (7) just right audio collector (9).

2. The audio signal acquisition device according to claim 1, wherein the upstream section of the main air path (4) is a compression section (4-1) which is gradually narrowed, the downstream section is an air cavity (4-2) with a width not less than that of the compression section (4-1), a high pressure nozzle (4-3) is formed at the joint of the compression section (4-1) of the main air path (4) and the air cavity (4-2), and the stopper (6) is arranged in the air cavity (4-2) and is opposite to the high pressure nozzle (4-3).

3. The audio signal acquisition device according to claim 2, wherein the interior of the inner shell (1) is divided into three air passages by two partition plates (13), the air passage between the two partition plates (13) is a main air passage (4), and the tail end of the main air passage (4) is converged with the side air passage (5) and then communicated with the air outlet (3).

4. The audio signal acquisition device according to claim 2, wherein the interior of the inner housing (1) is divided into a plurality of air paths by an isolation tube (23) arranged along the air flow direction and a connecting plate (24) circumferentially and uniformly distributed on the outer wall of the isolation tube (23), one end of the connecting plate (24) far away from the isolation tube (23) is connected with the inner wall of the inner housing (1), wherein the air path inside the isolation tube (23) is a main air path (4), the air path outside the isolation tube (23) is a side air path (5), the isolation tube (23) comprises a tapered tube (23-1) positioned at the upstream and a straight tube (23-2) sleeved outside the downstream end of the tapered tube (23-1), the opening area of the upstream end of the tapered tube (23-1) is larger than that of the downstream end, and the straight tube (23-2) is sleeved from the downstream end to the upstream end of the tapered tube (23-1) to the upstream end of the straight tube (23-2) and the tapered tube (23 1) The outer wall of the straight pipe (23-2) is abutted, the outer wall of the downstream end of the straight pipe (23-2) extends outwards in the radial direction to form a support plate (25), one end, far away from the straight pipe (23-2), of the support plate (25) is connected with the inner shell (1) and is opposite to the sound wave transmission hole (7), the downstream end of the straight pipe (23-2) is located at the downstream end of the conical pipe (23-1), a compression section (4-1) is formed in the conical pipe (23-1), an air cavity (4-2) is formed in the straight pipe (23-2) at the downstream end of the conical pipe (23-1), a high-pressure nozzle (4-3) is arranged at the downstream end of the conical pipe (23-1), a stop block (6) is located in the air cavity (4-2) and is connected with the inner wall of the straight pipe (23-2), and the pipe wall, located at the upstream side of the straight pipe (23-2 An elongated hole (26).

5. The audio signal acquisition device according to claim 3 or 4, wherein a groove (6-1) is formed in one surface of the stop block (6) facing the high-pressure nozzle (4-3), the groove (6-1) is facing the high-pressure nozzle (4-3), and the sound wave conducting hole (7) is adjacent to the bottom of the groove (6-1).

6. The audio signal acquisition device according to claim 5, wherein the stopper (6) divides the air cavity (4-2) into two branch air paths (8), and the sum of the flow areas of the narrowest parts of the two branch air paths (8) is smaller than the opening area of the main air path (4) at one end of the air inlet (2).

7. The audio signal acquisition device as claimed in claim 3, characterized in that the partitions (13) on both sides of the high-pressure nozzle (4-3) are convex-pointed.

8. The audio signal acquisition device according to claim 3 or 4, wherein the stopper (6) is annular, the inner hole of the stopper is formed by connecting a straight hole section (27) located at the upstream and a conical hole section (28) located at the downstream, the downstream opening of the conical hole section (28) is smaller than the upstream opening, the upstream end surface of the stopper (6) is a conical surface (29) facing the outside of the stopper (6), the upstream end surface of the stopper (6) intersects with the inner side surface of the stopper to form a sharp annular edge (30), and the annular edge (30) is opposite to the high-pressure nozzle (4-3) or is located in a diffusion region of the air flow sprayed by the high-pressure nozzle (4-3).

9. The audio signal acquisition device according to claim 1, wherein a signal transmission assembly (22) for transmitting the audio signal acquired by the audio acquisition unit (9) is further arranged outside the inner shell (1), the audio acquisition unit (9) comprises a pickup (9-1), a circuit board (9-2) and an output data line (9-3) which are connected with each other, and the signal transmission assembly (22) comprises a processor (11) connected with the output data line (9-3), a power supply (10) connected with the processor (11) and a wireless signal transmission module (12).

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