CN113520450B

CN113520450B - Wireless stethoscope

Info

Publication number: CN113520450B
Application number: CN202010285972.5A
Authority: CN
Inventors: 李川涛; 谢长勇; 范晓强; 曹文; 姚永杰; 司高潮
Original assignee: Chinese Peoples Liberation Army Naval Characteristic Medical Center
Current assignee: Chinese Peoples Liberation Army Naval Characteristic Medical Center
Priority date: 2020-04-13
Filing date: 2020-04-13
Publication date: 2023-03-14
Anticipated expiration: 2040-04-13
Also published as: CN113520450A

Abstract

The invention discloses a wireless stethoscope, which comprises a sound source contact part, wherein the sound source contact part is used for being attached to a body to be auscultated, and comprises: the sound source transmission part is connected with the operating part, the operating part is used for a user to operate the sound source contact part, the distance from the top surface of the operating part to the bottom surface of the contact part is 20 mm-30 mm, and the operating part is made of metal; the sound source transmission part is provided with a cavity transmission channel, the cavity transmission channel is provided with a first end and a second end along the extension direction of the cavity transmission channel, the first end is connected with the sound source contact part, the length of the cavity transmission channel is between 35cm and 50cm, and the cavity transmission channel is a soft cavity transmission channel; the sound source collecting part is connected with the second end and can collect sound in a frequency range of 20Hz to 50 Hz; a sound source processing unit connected to the sound source collecting unit; and a sound source receiving unit wirelessly connected to the sound source processing unit. The invention can effectively realize doctor-patient isolation and the stethoscope has high signal-to-noise ratio.

Description

Wireless stethoscope

Technical Field

The invention relates to the technical field of auscultation, in particular to a wireless stethoscope.

Background

The stethoscope is a common tool for doctors, and has important application value in the aspects of respiratory system disease and cardiovascular disease diagnosis. With the development of more than two hundred years, the auscultation method has become an important diagnostic method for respiratory diseases.

Although the traditional stethoscope has the advantages of simple operation, low cost, wide application and the like, the traditional stethoscope cannot be used by medical staff after the medical staff wear protective clothing due to the high infectivity of respiratory diseases at present. Doctors urgently need but cannot use the stethoscope, and a large number of patients are delayed and misdiagnosed.

Some electronic stethoscopes are available in the market at present, but auscultation under the condition that a doctor wears a protective garment is not considered, and the structure of the stethoscope and the auscultation mode of the doctor are similar to those of the traditional stethoscope. The conventional electronic stethoscope also fails.

At present, related patents and patent applications of electronic auscultation are designed considering miniaturization, and audio collectors (resistive, capacitive, electromagnetic and piezoelectric) are placed in a stethoscope head, so that the stethoscope is miniaturized, but the noise is loud, and particularly in an intensive care unit, various noises exist, particularly the noises are extremely loud when the stethoscope head is attached to the body of a patient and the stethoscope head moves, and the noises come from the interference of electronic circuits at the back of the stethoscope on the one hand and the interference at the back of the sound pickup probe on the other hand, such as sounds at the back of the stethoscope head, finger joint motions of a user and other sounds collected by the sound pickup probe. These noises have a great influence on the correct diagnosis of the doctor, and therefore, it is important to reduce the noise of the stethoscope.

Chinese patent publication No. CN201480020262 discloses an electronic stethoscope device, including: a bioacoustic sensing part for sensing bioacoustics; a noise sensing section for sensing noise generated in the bioacoustic sensing process; a noise removing part for removing the sensed noise from the sensed bioacoustics and outputting the bioacoustics. This patent document provides a method of reducing noise, and a noise removing section calculates a noise signal by using a sensing value output from a motion sensor, and can output a detected bioacoustic by filtering using the frequency of the noise signal. For example, the bioacoustic detection portion detects bioacoustics; an electrocardiogram signal detection unit detects an electrocardiogram signal; the noise removing section estimates a position of a heart sound from the detected bioacoustics using the detected electrocardiogram signal, and removes noise from the bioacoustics. In order to reduce noise, a noise reduction algorithm for properly removing noise is provided, noise reduction is realized through software algorithm design, and the process is complex.

Disclosure of Invention

The invention aims to solve the technical problems of doctor-patient isolation and loud stethoscope noise. The invention provides a wireless stethoscope, which can effectively realize doctor-patient isolation and has high signal-to-noise ratio.

In order to solve the above technical problems, an embodiment of the present invention discloses a wireless stethoscope, including a sound source contact portion for attaching to a body to be auscultated; the sound source transmission part is provided with a cavity transmission channel, the cavity transmission channel is provided with a first end and a second end along the extending direction of the cavity transmission channel, the first end is connected with the sound source contact part, the length of the cavity transmission channel is between 35cm and 50cm, and the cavity transmission channel is a soft cavity transmission channel; the sound source collecting part is connected with the second end and can collect sound in a frequency range of 20Hz to 50 Hz; a sound source processing unit connected to the sound source collecting unit; a sound source receiving unit wirelessly connected to the sound source processing unit; the sound source contact portion includes: the operation portion and the contact site that are connected, sound source transmission portion with the operation portion is connected, the operation portion is used for supplying the user operation the sound source contact site, the contact site is used for laminating in by the auscultation body, the top surface of operation portion extremely the distance of the bottom surface of contact site is between 20mm to 30mm, the operation portion is the metal material.

Adopt above-mentioned technical scheme, when the doctor wore the protective clothing auscultation, sound source receiving part is worn to the ear, with the laminating of sound source contact site on one's body by the auscultation body (patient), sound source contact site transmits sound source collection portion with sound sources such as patient's heartbeats and breathing through the cavity transmission path of sound source transmission portion, sound source collection portion transmits these sound source signals for sound source processing portion, after handling, with in sending signal transmission again and the sound source receiving part that sound source processing portion wireless connection pairs, owing to use wireless transmission, thereby realized the doctor wear under the protective clothing condition and the patient between the auscultation of isolation.

Further, the following structure is provided: 1) The cavity transmission channel is connected with the sound source contact part and the sound source collecting part, compared with the mode that the sound source collecting part is directly arranged in the metal connecting pipe connected with the sound source contact part, the noise collected by the sound source collecting part is greatly reduced, the signal to noise ratio of the wireless stethoscope is improved, and thus the stethoscope sound heard by a doctor is very similar to the sound of the traditional stethoscope, so that the diagnosis accuracy of the doctor wearing the protective clothing is improved; 2) When the length of the cavity transmission channel is 35cm to 50cm, the strength of the audio signal is stable; 3) The sound source collecting part can collect 20Hz to 50Hz frequency band sounds, including 20Hz and 50Hz frequency bands, so that the sound source collecting part can prevent certain low frequency band sounds from being incapable of being collected by the stethoscope, and doctor misdiagnosis is avoided; 4) The distance range from the operated top surface to the bottom surface of the contact part can effectively reduce noise, so that the intensity of the audio signal is stable, and the sound source received by the sound source receiving part is clear, thereby being beneficial to diagnosis; 5) The operation portion uses the metal material, further plays the effect of making an uproar again for audio signal intensity is more stable, and the sound source through sound source receiving portion receipt is more clear, more does benefit to the diagnosis.

The combination of above-mentioned structure 1) to 5) can mutually support, the synergism, at the initial source of sound source (sound source contact site) and all can handle the sound source to final every step of transmitting before for the sound source receiving part, for example fall and make an uproar, promote wireless stethoscope's audio signal intensity, the noise reduction effect is good, and finally the doctor passes through the sound source that the sound source receiving part received clearly, has promoted doctor's diagnosis rate of accuracy greatly.

According to another embodiment of the invention, the distance from the top surface of the operating portion to the bottom surface of the contact portion in a direction perpendicular to the contact surface of the contact portion is between 20mm and 30 mm.

According to another specific embodiment of the present invention, the contact portion comprises a suspended membrane.

According to another specific embodiment of the present invention, the sound source processing unit is provided with a noise reduction MIC.

According to another embodiment of the present invention, the sound source device further comprises a metal connection pipe, one end of which is connected to the sound source contact part and the other end of which is connected to the first end.

According to another specific embodiment of the present invention, the sound source contact portion is a stethoscope probe, the sound source transmission portion is a hose, the sound source collection portion is a sound pickup, the sound source processing portion includes a control circuit board, the control circuit board is provided with a wireless communication module, the sound source receiving portion is a wireless earphone, and the wireless earphone is wirelessly connected to the wireless communication module.

According to another embodiment of the invention, the hose is a latex hose or a rubber hose.

According to another specific embodiment of the present invention, the wireless communication module is a bluetooth audio communication module, and the wireless headset is a bluetooth headset.

According to another embodiment of the present invention, the sound pickup is one of a resistive, capacitive, electromagnetic or piezoelectric based microphone.

According to another specific embodiment of the present invention, the sound pickup is a condenser electret microphone.

According to another embodiment of the present invention, the condenser electret microphone is a unidirectional condenser electret microphone.

According to another specific embodiment of the present invention, the control circuit board further includes a microprocessor, a storage module, a signal amplification filter circuit, a battery, a wireless connection status indication LED, a power-on status indication LED, a key, a charging or external power interface, the microprocessor is electrically connected to the storage module, the signal amplification filter circuit, the battery, the wireless connection status indication LED, the power-on status indication LED, the key, the charging or external power interface, the sound pickup is electrically connected to the signal amplification filter circuit, and the microprocessor of the wireless communication module is integrated in the microprocessor.

According to another specific embodiment of the present invention, the control circuit board further includes a microprocessor, a storage module, a signal amplification filter circuit, a battery, a wireless connection status indication LED, a power on status indication LED, a key, and a charging or external power interface, the microprocessor is electrically connected to the storage module, the signal amplification filter circuit, the battery, the wireless connection status indication LED, the power on status indication LED, the key, the charging or external power interface, and the wireless communication module, respectively, and the sound pickup is electrically connected to the signal amplification filter circuit.

According to another specific embodiment of the present invention, the control circuit board further comprises an audio output port, and the audio output port is connected to the microprocessor and/or the signal amplification filter circuit.

According to another specific embodiment of the invention, the microprocessor is internally integrated with a charging management microprocessor, a digital noise reduction microprocessor, a wireless connection state indication LED, a power-on state indication LED, a signal acquisition microprocessor and a key management microprocessor.

According to another embodiment of the present invention, there are at least two sound source receiving portions, each of the sound source receiving portions is capable of being wirelessly connected to the sound source processing portion, and each of the sound source receiving portions is adapted to be worn by a user.

According to another embodiment of the present invention, the sound source processing unit includes wireless audio transmitters, and each of the sound source receiving units is capable of wirelessly connecting with the wireless audio transmitter.

According to another embodiment of the present invention, each of the sound source receiving units is a wireless earphone, and each of the wireless earphones can be wirelessly connected to the wireless audio transmitter.

According to another specific embodiment of the present invention, the portable sound source further comprises at least one wireless audio receiver, the wireless audio receiver is wirelessly connected to the wireless audio transmitter, each sound source receiving unit is a wired earphone, and each wired earphone can be connected to the wireless audio receiver by a wire.

According to another specific embodiment of the present invention, the sound source device further comprises at least one wireless audio receiver, the wireless audio receiver is wirelessly connected to the wireless audio transmitter, one part of the at least two sound source receivers is a wired earphone, the other part of the at least two sound source receivers is a wireless earphone, the wireless earphone can be wirelessly connected to the wireless audio transmitter, and the wired earphone can be in wired connection with the wireless audio receiver.

According to another embodiment of the present invention, the wireless audio transmitter is embedded with a high-pass CRS8670 bluetooth chip or a high-pass CRS8675 bluetooth chip.

According to another embodiment of the present invention, the sound source processing unit comprises a signal amplifying and filtering circuit, the signal amplifying and filtering circuit comprises a pre-amplifying circuit and a band-pass filtering circuit, the passband cutoff frequency of the signal amplifying and filtering circuit is 24Hz to 3332Hz, and the overall passband amplification gain is 34.8dB.

According to another specific embodiment of the present invention, the preamplifier circuit includes a band-pass filter, the band-pass filter circuit includes at least one band-pass filter, and the band-pass filters have the same composition structure.

According to another embodiment of the present invention, the passband of the preamplifier circuit is cut to a frequency of 12Hz to 9500Hz, and the passband amplification gain is 24dB; the band-pass filter circuit comprises three band-pass filters, the cut-off frequency of the pass band of each band-pass filter is 10Hz to 7000Hz, and the amplification gain of the pass band is 3.6dB.

According to another embodiment of the invention, the stethoscope further comprises a sound insulation cover which is arranged around the sound source contact part and can be attached to the auscultated body.

According to another specific embodiment of the present invention, the stethoscope further includes an auscultation handle extending along a first direction, wherein the first direction is perpendicular to the direction in which the sound source contact portion is attached to the contact surface of the auscultation body, and along the first direction, one end of the auscultation handle extends into the sound-proof housing, and the other end of the auscultation handle is located outside the sound-proof housing for the user to operate the sound source contact portion.

According to another embodiment of the present invention, the auscultation handle is a hollow tubular body, and the hollow tubular body includes a first portion, a second portion and a third portion connected to each other along the first direction, the first portion is connected to the sound-collecting cavity of the sound source contact portion, the second portion is connected to the soundproof cover, and the third portion is connected to the sound source transmission portion.

Drawings

FIG. 1 is a schematic structural diagram of a wireless stethoscope according to an embodiment of the present invention;

FIG. 2 is a first perspective view of a wireless stethoscope according to an embodiment of the present invention;

FIG. 3 is a second perspective view of a wireless stethoscope according to an embodiment of the present invention;

FIG. 4 is a side view of a wireless stethoscope according to an embodiment of the present invention;

FIG. 5 is a first hardware block diagram of a control circuit board of the wireless stethoscope according to the embodiment of the present invention;

FIG. 6 is a second hardware block diagram of the control circuit board of the wireless stethoscope according to the embodiment of the present invention;

FIG. 7 is a graph of hose length versus audio signal strength for a wireless stethoscope according to an embodiment of the present invention;

FIG. 8 is a third perspective view of a stethoscope according to an embodiment of the present invention;

FIG. 9 is a top view of a stethoscope according to an embodiment of the present invention;

FIG. 10 isbase:Sub>A sectional view taken along line A-A of FIG. 9;

FIG. 11 is a perspective view of a auscultation handle of the stethoscope according to an embodiment of the present invention;

FIG. 12 is a diagram of a stethoscope according to a second embodiment of the present invention;

FIG. 13 is a third schematic structural diagram of a stethoscope according to an embodiment of the present invention;

FIG. 14 is a fourth structural diagram of a stethoscope according to an embodiment of the present invention;

FIG. 15 is a schematic diagram of a module connection of an electronic auscultation system according to an embodiment of the present invention;

FIG. 16 is a diagram of an adaptive filtering process of an electronic auscultation system according to an embodiment of the present invention;

FIG. 17 is a schematic diagram showing the intensity of sound signals before and after adaptive filtering in an electronic auscultation system according to an embodiment of the present invention;

FIG. 18 is a flow chart of an electronic auscultation method according to an embodiment of the present invention.

Detailed Description

The following description is given by way of example of the present invention and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description. While the invention will be described in conjunction with the preferred embodiments, it is not intended that the features of the invention be limited to that embodiment. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been omitted from the description in order not to obscure or obscure the focus of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

It should be noted that in this specification, like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements indicated must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the present invention.

The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present embodiment can be understood in specific cases by those of ordinary skill in the art.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to fig. 1, the present invention provides a wireless stethoscope including: a sound source contact part 1 for being attached to an auscultated body (e.g., a patient); a sound source transmission part 3, which is provided with a cavity transmission channel 30, wherein, along the extending direction of the cavity transmission channel 30, the cavity transmission channel 30 has a first end and a second end, optionally, the first end and the second end are the head and tail ends of the cavity transmission channel 30 of the sound source transmission part 3, wherein, the first end is connected with the sound source contact part 1; the sound source collecting part 4 is connected with the second end, and optionally, the sound source collecting part 4 is plugged into a cavity of the second end; a sound source processing unit 5 connected to the sound source collecting unit 4; and a sound source receiving unit 13 wirelessly connected to the sound source processing unit 5.

Optionally, the wireless stethoscope further includes a metal connection pipe 2, one end of the metal connection pipe 2 is connected to the sound source contact part 1, and the other end is connected to the first end. That is, the metal connection pipe 2 functions to connect the sound source contact part 1 and the sound source transmission part 3.

Adopt above-mentioned technical scheme, when the high infectious diseases of respiratory disease appear, for safe visit, medical personnel need wear protective clothing, when the doctor wears protective clothing to auscultate, sound source receiving part 13 is worn to the ear, with sound source contact site 1 laminating on by the auscultation body (patient), sound source contact site 1 transmits the sound source such as heartbeat and the breathing of patient to sound source collection portion 4 through the cavity transmission path 30 of sound source transmission portion 3, sound source collection portion 4 gives sound source processing part 5 with these sound source signal transmission, after the processing, in sending the signal to the sound source receiving part 13 that pairs with sound source processing part 5 wireless connection again, owing to use wireless transmission, thereby realized the auscultation of keeping apart between the doctor and the patient under the protective clothing circumstances, not only safe but also do not influence the auscultation.

Moreover, because the cavity transmission channel 30 is used to connect the sound source contact part 1 and the sound source collecting part 4 (structure 1), compared with the mode that the sound source collecting part 4 is directly installed in the metal connecting pipe 2 connected with the sound source contact part 1, the noise collected by the sound source collecting part 4 is greatly reduced, and the signal to noise ratio of the wireless stethoscope is improved, so that the stethoscope sound heard by a doctor is very similar to the sound of the traditional stethoscope, and the diagnosis accuracy of the doctor wearing the protective clothing is improved. Therefore, the noise is effectively reduced through the cavity transmission channel 30, the noise reduction is realized through the design of a mechanical structure without using a software algorithm like the prior art, the noise reduction process is simple, and the cost is reduced.

In addition, the curse of the university of inner Mongolia of the skilled person is thought in the Master academic thesis "design of electronic stethoscope" (subscript 12 pages): the shorter the sound guide tube is, the larger the amplitude of the output signal of the acquisition auditory head is, and the better the sound transmission effect is; i.e. the shorter the length of the cavity transmission channel 30, the better the sound transmission effect and the better the noise reduction effect.

However, the applicant of the present invention has studied to conclude that contrary to the idea of the above-mentioned paper, the applicant believes that the shorter the length of the cavity transmission channel 30 is, the more advantageous the noise reduction is. The applicant has used Power Lab software to perform a sample test by placing the wireless stethoscope of the present invention at the left chest and then acquiring the signal strength of the audio output port by adjusting the cavity transmission channel 30 at intervals of 5cm in the length range of 5cm to 70cm, respectively, as shown in fig. 7, and through this test, it can be seen that the audio signal strength is stable when the cavity transmission channel 30 is 35cm to 50cm in length (configuration 2), including 35cm and 50cm, such as 38cm, 42cm, etc., the inventor has found that when the cavity transmission channel 30 is greater than 50cm or less than 35cm in length, the audio signal strength becomes small, so that the optimum cavity transmission channel length range is selected when the cavity transmission channel 30 is between 35cm and 50cm, and in a specific application, other parameter ranges can be selected as desired.

Further, the cavity transmission channel 30 is a soft cavity transmission channel. That is, the sound source transmission part 3 is made of a soft material, and optionally, the sound source transmission part 3 is a latex hose or a rubber hose. This one side does benefit to auscultation and detects, and on the other hand uses soft cavity transmission path 30 also to fall to make an uproar and play beneficial effect for audio signal intensity is stable, and the sound source that receives through sound source receiving portion 13 is clear, does benefit to the diagnosis.

Further, the sound source collecting part 4 of the present invention can collect sounds in the 20Hz to 50Hz bands (structure 3), including the 20Hz and 50Hz bands. After setting up like this, can prevent that the sound of some low-frequency channels can't be gathered by the stethoscope, avoid doctor's misdiagnosis. Further alternatively, the sound source collecting part 4 of the present invention may collect sound in a frequency band of 20Hz to 10000 Hz.

Further, referring to fig. 2 to 4, the sound source contact part 1 includes: the sound source transmission part 3 is connected with the operation part 15, the operation part 15 is used for the user to operate the sound source contact part 1, the contact part 16 includes but is not limited to a suspension film for being attached to the body to be auscultated, the distance H from the top surface of the operation part 15 to the bottom surface of the contact part 16 is between 20mm and 30mm (structure 4), including 20mm and 30mm, for example 26mm. Alternatively, the distance from the top surface of the operating portion 15 to the bottom surface of the contact portion 16 in the direction perpendicular to the contact surface of the contact portion 16 (indicated by the X direction in fig. 4) is between 20mm and 30 mm.

When the doctor operates the operation portion 15 to auscultate, the noise is very loud when the contact portion 16 moves along the body of the patient and the sound source contact portion 1, and on one hand, the noise is caused by interference behind the sound source contact portion 1, for example, the sound source collection portion 4 collects sounds such as finger joint movement of the user at the operation portion 15. By setting the above distance range from the top surface of the operation portion 15 to the bottom surface of the contact portion 16, noise can be effectively reduced, so that the intensity of an audio signal is stable, and a sound source received by the sound source receiving portion 13 is clear, which is favorable for diagnosis.

Alternatively, referring to fig. 2, the operation portion 15 is "narrow on top and wide on bottom" and the "narrow" portion 152 is for the user to manipulate the operation portion 15, on the one hand, to facilitate the user's operation, and on the other hand, to reduce the weight of the sound source contact portion 1. The "wide" portion 151 is connected to the contact portion 16, and the shapes thereof match. In this embodiment, the "wide" portion 151 and the contact portion 16 are both cylindrical.

Further, the operation portion 15 is made of a metal material (structure 5). The metal material may be copper, stainless steel or other metal material. The operation portion 15 uses metal material, further plays the effect of making an uproar again for audio signal intensity is more stable, and the sound source that receives through sound source receiving portion 13 is more clear, more does benefit to the diagnosis.

Further, the sound source processing unit 5 is provided with a noise reduction MIC14 (structure 6). Optionally, sound source processing portion 5 is equipped with the casing, and the casing has the cavity of making an uproar of falling, and the MIC14 of making an uproar of falling is located and is fallen in the cavity of making an uproar, and the MIC14 of making an uproar of falling is set up and further is played the effect of making an uproar again for audio signal intensity is more stable, and the sound source of receiving through sound source receiving portion 13 is more clear, more does benefit to the diagnosis.

Above-mentioned each structure 1) to 5) or the combination of structure 1) to 6) can mutually support, synergism, initial source (sound source contact site 1) of sound source all can handle the sound source to final every step before transmitting for sound source receiving part 13, for example fall and make an uproar, promote wireless stethoscope's audio signal intensity, the noise reduction effect is good, and finally the doctor passes through the sound source that sound source receiving part received clearly, has promoted doctor's diagnosis rate of accuracy greatly.

In this embodiment, sound source contact site 1 is the stethoscope probe, sound source transmission portion 3 is the hose, sound source collection portion 4 is the adapter, sound source processing portion 5 includes control circuit board, control circuit board is equipped with wireless communication module, sound source receiving portion 13 is wireless earphone, wireless earphone with wireless communication module wireless connection. Stethoscope probe (sound source contact part 1) is connected with the one end of metal connecting pipe 2, and adapter (sound source collection part 4) is connected with control circuit board (sound source processing part 5) electricity, and the pot head of hose (sound source transmission part 3) is served at one of metal connecting pipe 2 keeping away from stethoscope probe (sound source contact part 1), and adapter (sound source collection part 4) has been filled to the other end stopper of latex hose (sound source transmission part 3).

Optionally, the hose is a latex hose or a rubber hose. Optionally, the wireless communication module is a bluetooth audio communication module, the wireless headset is a bluetooth headset, and the bluetooth headset (the sound source receiving portion 13) is paired with the bluetooth audio communication module for use.

The stethoscope is plugged into one end of the latex hose through the sound pick-up, the other end of the latex hose is connected with the metal connecting pipe 2 connected with the stethoscope probe, the stethoscope probe transmits heartbeat and respiration signals of a patient to the sound pick-up through the metal connecting pipe 2 and the latex hose, the sound pick-up converts the signals into electric signals, the electric signals are processed through an internal program of the microprocessor after passing through the signal amplifying and filtering circuit, and the signals are transmitted to the wireless earphone matched with the wireless microphone through the wireless communication module integrated in the microprocessor or the wireless communication module arranged independently. The adapter is connected to the stethoscope probe through the hose that length is 35cm to 50cm, compares in the mode of with adapter direct mount in the metal connecting pipe 2 that is connected with the stethoscope probe, greatly reduced the noise that the adapter gathered, the stethoscope sound that the doctor heard like this is very similar with traditional stethoscope sound to realize that the doctor is when diagnosing that there is not the obstacle to switch between traditional stethoscope and the electron stethoscope.

In an embodiment, the sound pickup (sound source collecting part 4) is selected from one of resistive, capacitive, electromagnetic or piezoelectric microphones, preferably a capacitive electret microphone, and more preferably a unidirectional capacitive electret microphone.

In a specific embodiment, as shown in fig. 1 and 5, the control circuit board (sound source processing portion 5) includes a microprocessor, a storage module, a signal amplification filter circuit, a battery, a key, an audio output port 11, a charging or external power interface 12, the LEDs shown in fig. 5 and 6 may include a wireless connection status indication LED 6 and a power-on status indication LED 7, the microprocessor is electrically connected to the storage module, the signal amplification filter circuit, the battery, the wireless connection status indication LED, the power-on status indication LED, the key, the audio output port 11, the charging or external power interface 12, the sound pickup (sound source collecting portion 4) is electrically connected to the signal amplification filter circuit, the key may include a power-on/off key 9, a volume-up key 8 and a volume-down key 10, the key may be a mechanical key, a touch key, a photosensitive key, etc., the power-on/off key 9 may control the power-on/off of the entire control circuit board, when the control circuit board is not in use, the doctor turns off the control circuit board, the ear may not be interfered by noise even if the wireless earphone is not taken off, the volume-on/off key 8 and the volume-off key 10 may adjust the hearing ability of the doctor clearly.

In some embodiments, the microprocessor is either a microprocessor that has integrated a bluetooth audio communication module, as shown in fig. 6; or a general microprocessor without an integrated bluetooth audio communication module is selected, as shown in fig. 5. When a common microprocessor without an integrated Bluetooth audio communication module is selected, the control circuit board also comprises an independent Bluetooth audio communication module, the Bluetooth audio communication module is connected with the common microprocessor, and the storage module preferably adopts a pluggable memory such as a removable storage device such as a U disk, a TF card, an SD card, a mobile hard disk and the like, and the battery can be a disposable battery or a rechargeable lithium battery. The storage module can store and export the auscultation information of the patient and perform subsequent analysis.

In the above embodiment, the audio output port 11 is connected to the microprocessor, and in some embodiments, the audio output port 11 may also be directly connected to the signal amplification filter circuit before signal acquisition of the microprocessor, that is, the audio output port is connected to the signal amplification filter circuit. In still other embodiments, the audio output port is connected to both the microprocessor and the signal amplification and filtering circuit

Set up audio output port 11, when being used for doctor-patient isolation state down doctor's use, also can be used to doctor's daily use, doctor's ear need be plugged up in order to reach two auscultation pipes of good auscultation effect to traditional stethoscope, the doctor is uncomfortable, wireless stethoscope can enlarge through the audio frequency, filtering treatment, the doctor inserts the earphone and just can come the auscultation through the earphone with the audio output port, the doctor both can hear the better case sound of tone quality like this, also relatively more comfortable during the auscultation.

In a specific embodiment, the microprocessor is internally integrated with indication control, signal acquisition and key management such as charging management, digital noise reduction, wireless connection state indication LED, startup state indication LED and the like.

There are many technical mature microprocessors on the market and finished products such as NRF52832 NRF52840 CSR8675 CSR8670 AP8048A BT321F AC690N/AC692N which integrate charging management, digital noise reduction, LED indication control, signal acquisition, key management and bluetooth audio communication modules inside, and their internal program setting relations can be referred to the technical specifications of these mature products, such as bluetooth hai-shisi 5.0 receiving transmitter, bluetooth greenbrier 5.0 transmitting receiver, etc., and will not be described in detail herein. For a common microprocessor without an integrated bluetooth audio communication module, microprocessors such as an STM32 series chip, an MSP430, an FPGA (programmable logic array) and the like can be selected, which are also very mature finished products, and the connection and composition between components of a control circuit board are also conventional circuits, which can be referred to specifically. For example, the practice of STM32 singlechip application and full case practice, the practical war guideline developed in STM32 library (2 nd edition): based on STM32F103, the books such as TMS320F28335 DSP principle, development and application have detailed introduction and routine.

The following are two specific applications of the invention:

(1) Under the condition of isolation of doctors and patients

The doctor wears the bluetooth headset, wears the protective clothing, and the bluetooth headset is worn with oneself and is belonged to the cleaning product. The stethoscope probe placing area does not have an isolation area and belongs to a pollutant. After the doctor enters the ward, the startup and shutdown key 9 on the wireless stethoscope is turned on, and after the Bluetooth headset and the stethoscope are automatically paired, the doctor can use the wireless stethoscope through the Bluetooth headset as a common stethoscope.

(2) The doctor and the patient do not need to be isolated

Under the condition that doctors and patients do not need to be isolated, doctors can auscultate by the aid of the wireless stethoscope through common earphones as well as common stethoscopes. For doctors with bad hearing for old people, the stethoscope can be preferentially used under the condition that the traditional stethoscope cannot be used.

Referring to fig. 8 to 11, the present invention also provides a stethoscope including: the sound source contact part 1 and the sound source transmission part 3 according to the foregoing embodiments, that is, the sound source contact part 1 is used to be attached to a body to be auscultated, and one end of the cavity transmission channel 30 of the sound source transmission part 3 is connected to the sound source contact part 1. The stethoscope may be a wireless stethoscope as described in the previous embodiments, or may be a conventional stethoscope. In this embodiment, the end of the sound source contact portion 1 includes a suspension film 1b, and the suspension film 1b corresponds to the sound pickup cavity 1a of the sound source contact portion 1, and can be attached to the body to be auscultated. The stethoscope of this embodiment further includes a soundproof cover 50 provided around the sound source contact portion 1, and can be attached to the body to be auscultated.

Adopt above-mentioned technical scheme, on the one hand, the sound-proof housing 50 completely cuts off the entering noise behind the sound source contact site 1, and on the other hand, sound-proof housing 50 with by the laminating back of the auscultation body, sound-proof housing 50 completely cuts off the noise and gets into the route of the auscultation MIC 70 that the stethoscope later-mentioned between the contact surface of the auscultation body from sound source contact site 1, can be effectively with sound source contact site 1 with external sound completely cut off, realize making an uproar falls to improve the auscultation effect of stethoscope.

In one embodiment, referring to fig. 10, the soundproof cover 50 includes a cover body 51 and a soft attaching portion 52, the cover body 51 is made of a material having a soundproof effect, such as silica gel, soft gel, etc., the soft attaching portion 52 is used for attaching to the auscultated body, and the soft attaching portion 52 is, but not limited to, a soundproof cotton ring, and may also be made of other soundproof materials. In some embodiments, the soft fitting portion 52 is perpendicular to the mask body 51, facilitating user manipulation to fit the sound isolation cover 50 to the body being auscultated. The shape of the soundproof cover 50 is not limited, and may be a shape capable of providing a soundproof function. In this example, referring to fig. 8 and 10, the cover body 51 has a hollow conical shape, and the soft bonding portion 52 has a hollow ring shape.

With continuing reference to fig. 8, 10 and 11 and with further reference to fig. 1-4, the stethoscope further includes a stethoscope handle 60 extending in a first direction (indicated by direction X in fig. 10) perpendicular to the direction in which the sound source contact portion 1 is attached to the contact surface of the auscultated body, wherein one end of the stethoscope handle 60 extends into the sound-proof housing 50 and the other end thereof is located outside the sound-proof housing 50 for the user to operate the sound source contact portion 1. That is, the auscultation handle 60 of the stethoscope of the present application is perpendicular to the sound source contact part 1.

Traditional stethoscope avoids the decay of audio frequency conduction in-process, and the stethoscope leading note pipe is than shorter, and medical personnel and patient's distance will press close to more has been decided to the structure of stethoscope sound pick-up head to guarantee that the stethoscope fully laminates patient skin, and closely contact the patient, lead to medical personnel to receive the infection easily. And this application sets up back with auscultation handle 60 perpendicular to sound source contact site 1, and the doctor exerts pressure perpendicularly through auscultation handle 60, adjusts the auscultation effect, compares in the parallel structure of traditional auscultation handle and pickup diaphragm, and the stethoscope structure of this application has increased doctor and patient's distance, has reduced the risk of infecting.

Specifically, referring to fig. 10 and 11, the auscultation handle 60 is a hollow tubular body including a first portion 63, a second portion 62 and a third portion 61 connected in the first direction, the first portion 63 is connected to the sound-collecting cavity 1a of the sound source contact part 1, the second portion 62 is connected to the soundproof cover 50, and the third portion 61 is connected to the sound source transmission part 3.

The specific connection manner of the components is not limited, in this embodiment, the first portion 63, the second portion 62 and the third portion 61 of the auscultation handle 60 are provided with external threads, the sound-collecting cavity 1a of the sound source contact portion 1 is provided with internal threads, the sound-insulating cover 50 is provided with internal threads, the sound source transmission portion 3 is provided with internal threads, and the auscultation handle 60 is respectively in threaded connection with the sound source contact portion 1, the sound-insulating cover 50 and the sound source transmission portion 3. In addition, the setting area of the external thread on the auscultation handle 60 is not limited, and the corresponding connection can be realized. In the present embodiment, referring to fig. 11, the entire area of the first portion 63 is provided with the external thread, the partial area of the second portion 62 is provided with the external thread, and the entire area of the third portion 61 is provided with the external thread.

In some embodiments, the first portion 63 is provided with an auscultation MIC 70 at an end of the sound-collecting cavity 1a, and the auscultation MIC 70 collects sounds, such as heart sounds, lung sounds, etc., after the sound source contact portion 1 contacts the body surface of the patient. The cavity of the auscultation handle 60 can communicate with the cavity transmission passage 30 of the sound source transmission part 3 to transmit sounds collected by the auscultation MIC 70, such as heart sounds, lung sounds, etc., to enable the auscultation of the patient by the doctor.

With continuing reference to fig. 1 and with reference to fig. 5, 6 and 12 to 14, in some embodiments, the difference between the above embodiments is that in this embodiment, there are at least two sound source receiving portions 13 (wired headphones and wireless headphones, which will be described later), each sound source receiving portion 13 can be wirelessly connected to the sound source processing portion 5, and each sound source receiving portion 13 is used for being worn by one user. For example, the number of the sound source receiving units 13 is five, and one sound source receiving unit 13 is worn by the teacher, and the remaining sound source receiving units 13 are worn by the students. After the stethoscope is arranged, when a teacher auscultates and gives lessons, the sound heard by the teacher through the stethoscope is the same as the sound heard by students, so that the sound such as cardiopulmonary sounds and the like described by the teacher is heard by the teacher, namely the sound such as cardiopulmonary sounds heard by the students, and therefore the students can also really know what the sound such as cardiopulmonary sounds and the like described by the teacher is, the stethoscope is favorable for auscultation and learning, and the stethoscope is convenient for the teacher to give lessons.

Referring to fig. 12, the sound source processing unit 5 includes wireless audio transmitters (i.e., the wireless communication modules of the foregoing embodiments), and each of the sound source receiving units 13 is capable of being wirelessly connected to the wireless audio transmitter. In this embodiment, each of the sound source receiving portions 13 is a wireless earphone, and specifically, may be a wireless bluetooth earphone, and each of the wireless earphones can be wirelessly connected to the wireless audio transmitter. That is, the teacher and the student both wear wireless headphones. As described in the foregoing embodiments, after the sound source contact portion is attached to the body to be auscultated, the sound source passes through the sound pickup, and then is processed by the signal amplification and filtering circuit, and the audio is transmitted to the teacher and the students through the wireless audio transmitter.

Referring to fig. 13, in some possible alternative embodiments, the sound source receiving unit further includes at least one wireless audio receiver, the wireless audio receiver is wirelessly connected to the wireless audio transmitter, one part of the at least two sound source receiving units 13 is a wired earphone, and the other part of the at least two sound source receiving units is a wireless earphone, the wireless earphone is wirelessly connected to the wireless audio transmitter, and the wired earphone is connected to the wireless audio receiver by a wire. Namely, wireless audio transmitter on the one hand directly with teacher or the wireless earphone that the student wore pair the connection wirelessly, on the other hand with wireless audio receiver wireless pair after being connected, wireless audio receiver exports the audio frequency, passes through wired earphone with audio frequency transmission student or teacher after power amplification respectively. In this embodiment, the teacher wears wireless earphones, and the students wear wired earphones respectively. In some embodiments, it is also possible that the teacher wears wireless earphones, part of the students wears wired earphones, and part of the students wears wireless earphones.

Referring to fig. 14, in some possible alternative embodiments, the stethoscope further includes at least one wireless audio receiver, two of which are shown in fig. 14, but the number is not limited thereto. Each of the wireless audio receivers is wirelessly connected to the wireless audio transmitter, each of the sound source receiving parts 13 is a wired earphone, and each of the wired earphones is capable of being wired to the wireless audio receiver. That is, after each wireless audio receiver is connected with the wireless audio receiver in a wireless pairing manner, each wireless audio receiver outputs audio, and the audio is transmitted to students or teachers through wired earphones after power amplification.

Those skilled in the art can understand that there are many combinations of the sound source contact part and the wireless audio transmitter, the wireless audio transmitter can be connected to only one wireless audio receiver, the wireless audio receiver outputs signals, and different power amplifying circuits amplify audio signals and output the signals to wired earphones (both teachers and students can use the same). Some wireless audio transmitters may connect two wireless audio receivers, or one wireless headset with one audio receiver, or two wireless headsets, and thus have multiple implementations.

The wireless audio transmitter described in the above embodiments has a high-pass CRS8670 bluetooth chip or a high-pass CRS8675 bluetooth chip built therein. However, the wireless audio transmitter is not limited to using the high-pass CRS8670 bluetooth chip or the high-pass CRS8675 bluetooth chip, and any chip capable of transmitting an audio signal to a plurality of sound source contacts at the same time by one wireless audio transmitter may be used.

In addition, as described in the previous embodiment, the sound source collecting part 4 of the present invention can collect sounds in 20Hz to 50Hz bands, including 20Hz and 50Hz bands. After setting up like this, can prevent that the sound of some low-frequency channels can't be gathered by the stethoscope, avoid doctor's misdiagnosis. The reason for this is explained in further detail:

due to the high infectivity of respiratory system diseases, a negative pressure isolation ward needs to be established, the stethoscope of the embodiment solves the problem that a doctor wears a protective clothing to use the stethoscope under the negative pressure isolation ward, the noise of the negative pressure isolation ward can reach A sound level noise (65 dB to 68 dB), the noise frequency is distributed in an extremely wide frequency band range of 60Hz to 8000Hz, and the decibels of different frequency bands are different. The applicant can know that the environmental interference is distributed in the range of 10Hz to 5000Hz by analyzing the critical illness interference data of the fire mountain hospital. The frequency range of the lung breath sound of the human body is 50Hz to 3000Hz, the frequency range of the bowel sound is 60Hz to 1200 Hz, the frequency range of the heart sound signal is 200 Hz to 400Hz, the first heart sound with large loudness and clear identification is the first heart sound, and the frequency of the second heart sound is concentrated in 20Hz to 100Hz. Therefore, the environmental interference signals and the audio signals emitted by the physiological activities of the human body are highly mixed, and the auscultation of doctors is seriously influenced.

In order to effectively enable the sound source collecting part 4 to collect sound in a frequency band of 20Hz to 50Hz, the signal amplifying and filtering circuit in the sound source processing part 5 comprises a preamplification circuit and a band-pass filtering circuit, the cut-off frequency of the pass band of the signal amplifying and filtering circuit is 24Hz to 3332Hz, and the whole pass band amplifying gain is 34.8dB. After the signal amplification and filtering circuit is arranged, the sounds such as heart sounds and breath sounds in the frequency range of 20Hz to 50Hz can be collected, the sounds in low frequency ranges can be prevented from being collected by the stethoscope, and misdiagnosis of doctors is avoided.

Specifically, the preamplifier circuit comprises a band-pass filter, the band-pass filter circuit comprises at least one band-pass filter, and the band-pass filters are identical in composition structure. Those skilled in the art will appreciate that the bandpass filter can be configured with corresponding circuit configurations based on the passband cut-off frequency and the passband amplification gain, including the use of resistors, capacitors, operational amplifiers, and the like. In one embodiment, the components are the same, and the connection mode of each component is the same. The band-pass filter has the same composition structure, and the circuit has the characteristic of convenient debugging, so that the aims of modifying the passband amplification gain and the passband cut-off frequency range can be fulfilled only by adjusting the resistance capacitance value without modifying the original structure of the circuit.

Furthermore, the passband cut-off frequency of the preamplifier circuit is 12Hz to 9500Hz, and the passband amplification gain is 24dB; the band-pass filter circuit comprises three band-pass filters, the cut-off frequency of the pass band of each band-pass filter is 10Hz to 7000Hz, and the amplification gain of the pass band is 3.6dB. By using Multisim simulation, after the signal amplification filter circuit is set in such a way, the passband of the signal amplification filter circuit is cut to the frequency of 24Hz to 3332Hz, the whole passband amplification gain is 34.8dB, and the whole passband gain is smooth.

As shown in fig. 15, an embodiment of the present invention provides an electronic auscultation system, including: a stethoscope including a sound source contact part 1, a first sound pickup 41 (the sound source collecting part 4 in the foregoing embodiment), the sound source contact part 1 being adapted to be attached to a body to be auscultated, the first sound pickup 41 being disposed in the sound source contact part 1, the first sound pickup 41 being adapted to collect a first sound signal; a connection part 80 including a second sound pickup 81, the second sound pickup 81 being configured to pick up a second sound signal; and the processor is in communication connection with the first sound pickup 41 and the second sound pickup 81, and is used for performing adaptive filtering on the first sound signal according to the second sound signal to obtain a third sound signal.

During the use of the existing electronic auscultation system, the applicant finds that the main cause of poor sound signal quality is interference of environmental sound signals. In order to eliminate the interference of the environmental sound signals, the applicant further finds that the noise elimination effect corresponding to the common filter circuit and the method is poor due to the fact that the electronic auscultation system has various use scenes, various corresponding environmental sound signal sound sources and unfixed frequency value. In this embodiment, the sound source contact portion 11 of the stethoscope is attached to the body to be auscultated, so that the sound pickup picks up the sound, and the first sound pickup 41 is used to pick up the first sound signal. It will be appreciated that, in use, the user wishes the first sound signal to be a clean sound signal that is desired to be acquired, for example clean cardiopulmonary sounds. However, during use, an ambient sound signal may be mixed into the sound, and the ambient sound signal may be an animal call, a human hum, a television sound, a rain sound, etc., and one or more ambient sound signals may be present depending on the particular use environment. Such ambient sound signals are unwanted noise interference signals for the user, i.e. the first sound signal comprises both the wanted signal and the unwanted ambient sound signal for the user. Therefore, a second sound pickup 81 is further provided in this embodiment, and the second sound pickup 81 is provided on the connecting portion 80 and picks up a corresponding ambient sound signal, that is, a second sound signal.

As shown in fig. 15 to 16, during the use of the electronic auscultation system, the first sound pickup 41 picks up the first sound signal, and the second sound pickup 81 picks up the second sound signal, and the processor performs adaptive filtering on the first sound signal by using the picked-up second sound signal to obtain a corresponding third sound signal. In the filtering process, the first sound signal comprises a useful signal

And an ambient sound signal introduced by a transfer function H

The second sound signal is the environmental sound signal collected by the second sound collector 81

. Since the first sound pickup 41 and the second sound pickup 81 are in the same large environment, they are located in the same space

And

correlated, but useful, signal

The sound volume and the possibility of the sound being transmitted to the second sound collector 81 are small, and therefore it is considered that the sound volume and the possibility of the sound being transmitted to the second sound collector are small

And

is not relevant. The first sound signal can eliminate noise without changing signal through adaptive filter in the processor, and the filter coefficient is the filter parameter automatically adjusting the current time to adapt to the change of noise, so as to realize optimal filtering. So as to output the third sound signal

Middle elimination

Is a relatively pure useful signal.

By adopting the technical scheme, the electronic auscultation system disclosed by the invention can effectively eliminate the interference of environmental sound signals, improve the quality of the collected sound signals and improve the signal-to-noise ratio of the sound signals.

Another embodiment of the present invention provides an electronic auscultation system, in which the first sound pick-up 41 and the second sound pick-up 81 are respectively disposed on different carriers, as compared to the previous embodiment. Set up second adapter 81 and gather the second sound signal and carry out adaptive filtering again and can effectively reduce the interference of environment sound signal, but if locate same carrier with second adapter 81 and first adapter 41, the second sound signal that second adapter 81 gathered has often contained the sound signal that hopes of coming by first adapter 41 through the carrier transmission, corresponding useful signal can be gathered at the pickup in-process to second adapter 81 promptly, for example cardiopulmonary sound, cause partial useful signal also to be filtered behind the adaptive filtering easily, thereby lead to signal distortion. Therefore, the two sound pickups are respectively arranged on different carriers, so that the environment sound signals can be effectively filtered, the distortion of useful signals can be reduced, and the quality of the sound signals is ensured.

In another embodiment of the present invention, an electronic auscultation system is provided, and compared with the previous embodiment, the adaptive filtering employs an LMS algorithm. The LMS algorithm can carry out iterative operation which forms a certain step length with an error through the error between a useful signal expected by a user and an actual signal and then through a steepest descent method, so that a result is closer to an optimal value, and the interference of an environmental sound signal is more effectively filtered in a third sound signal. The original accurate gradient estimation value is replaced by the instantaneous value of each weighting coefficient, so that the calculated amount corresponding to the LMS algorithm is greatly reduced, the operation load of a processor in the same sound signal processing process is smaller, and the size of the electronic auscultation system can be smaller in the application with strict requirements on the size.

Therefore, the invention effectively reduces noise through the cavity transmission channel, realizes double noise reduction through the design of the algorithm and the mechanical structure, has simple noise reduction process, reduces the cost and has better noise reduction effect.

As shown in fig. 17, the PowerLab multichannel data acquisition system is used to collect audio output of a subject group designed with a dual-microphone electronic auscultation system, during experiment, daytime recording in a critical ward is isolated from a fire mountain by negative pressure through a sound box playing as environmental sound, meanwhile, cardiopulmonary sound of an experimental object is collected, and the signal-to-noise ratio of signals can be adjusted by adjusting the volume of the sound box. Defining a first channel as a useful signal S in the first sound signal, defining a third channel as a third sound signal N, filtering by using an LMS algorithm, and calculating a formula according to the following signal-to-noise ratio:

it can be seen that the signal-to-noise ratio of the set of signals after the LMS filtering is improved by 10.442dB, and the signals are not changed, which indicates that the quality of the sound signal is effectively improved and is not distorted.

In some embodiments, the first microphone 41 is a unidirectional condenser electret microphone and the second microphone 81 is an omni-directional condenser electret microphone. Since it is desirable that the first sound pickup 41 picks up pure useful signals during the use of the electronic auscultation system, the first sound pickup 41 is configured as a unidirectional microphone, and the smaller pickup radius is beneficial to reduce the mixing of ambient sound signals. And the second sound pick-up 81 is used for collecting environmental sound signals, so that the second sound pick-up 81 is set to be an omnidirectional microphone, and a larger sound pick-up radius is beneficial to collecting as many environmental sound signals as possible in the use environment, thereby reducing omission. Therefore, when self-adaptive cancellation is carried out, the environmental sound signals existing in the first sound signals are effectively and completely filtered, and the signal-to-noise ratio and the quality of the third sound signals are improved.

In some embodiments, the sound pickup orientations of the first sound pickup 41 and the second sound pickup 81 are the same. Although sound signals are divergently propagated in the air, the microphone head of the sound pickup generally does not receive sound in 360 degrees in all directions, and the distance and the direction between the microphone head and a sound source influence the sound pickup effect. Therefore, the direction of the sound pickup alignment of the first sound pickup 41 and the second sound pickup 81 is set to be consistent, so that the second sound pickup 81 is beneficial to collecting as many environmental sound signals as possible in the use environment, and omission is reduced. Therefore, when self-adaptive cancellation is carried out, the environmental sound signals existing in the first sound signals are effectively and completely filtered, and the signal-to-noise ratio and the quality of the third sound signals are improved.

As shown in fig. 15 and 18, an embodiment of the present invention provides an electronic auscultation method applied to an electronic auscultation system including a stethoscope including a sound source contact portion 1 and a first sound pickup 41, a connection portion 80 including a second sound pickup 81, and a processor communicatively connected to the first sound pickup 41 and the second sound pickup 81. The electronic auscultation method of the sound source contact part 1, namely the sound contact part, comprises the following steps: s1: the sound contact part is attached to the auscultated body; s2: the first sound pickup 41 picks up a first sound signal while the second sound signal is picked up by the second sound pickup 81; s3: the processor performs adaptive filtering on the first sound signal according to the received second sound signal to obtain a third sound signal.

In one embodiment, the connection portion 80 is an electronic device, the second sound pickup 81 is a microphone of the electronic device, the processor is disposed in the electronic device, the stethoscope further includes a connector electrically connected to the first sound pickup 41, the connector includes a microprocessor, the electronic device includes a power interface, and the electronic auscultation method may further include, before S1, S0: the power interface is electrically connected with the connector 1; s4 and S5 may also be included between S2 and S3, where S4 is: the microprocessor preprocesses the first sound signal, wherein the preprocessing at least comprises A/D conversion; s5 is as follows: the power interface receives the preprocessed first sound signal and transmits the preprocessed first sound signal to the processor.

Optionally, the connecting portion 80 is provided with a housing having a noise reduction cavity, and the second sound pickup 81 is disposed in the noise reduction cavity, so that the intensity of the sound signal is more stable, the sound source received by the electronic device is clearer, and diagnosis is more facilitated.

It should be noted that the electronic auscultation method disclosed in the present invention is for collecting, processing and applying sound signals, and does not belong to diagnosis of diseases. According to the electronic auscultation method disclosed in the embodiment, the processor performs adaptive filtering on the sound signals collected by the first sound pickup 41 and the second sound pickup 81 which are arranged at intervals, so that the interference of the environmental sound signals can be effectively eliminated, the quality of the obtained sound signals is improved, and the signal to noise ratio of the sound signals is improved.

Another embodiment of the present invention provides an electronic auscultation method, and with respect to the foregoing embodiments, the electronic device includes a storage unit and a display unit, and the electronic auscultation method may further include the following steps after S3: s61: the storage unit stores the third sound signal; s62: the display unit displays the audio feature of the third signal. The third sound signal is stored through the storage unit, the display unit displays the corresponding audio features of the third sound signal, so that a user or a doctor can observe the characteristics of the third sound signal intuitively, and the application of the sound signal is facilitated. The specific display content may be a time domain waveform diagram corresponding to the third sound signal, or a frequency spectrum diagram, etc., which is not limited in the present invention and may be selected according to actual needs.

A further embodiment of the present invention provides an electronic auscultation method, which may further include, before S1, S7: the storage unit stores a standard sound signal library; s81 and S82 may also be included after S3, where S81 is: the processor identifies the third sound signal according to the standard sound signal library; s82 is as follows: the display unit displays the recognition result. It will be appreciated that the sound signals generated by different sound sources have different spectral characteristics, such as the frequency, amplitude, etc. of the sound played by the television and the user's cardiopulmonary sounds. The cardiopulmonary sounds and respiratory sounds of different users and the sound signals in multiple measurements of one user have the same point and also have differences. According to the difference, the electronic device with the storage unit can store the corresponding standard sound signal library in advance, and in the using process, according to the difference of the environment, the third sound signal can be subjected to processing such as matching identification, filtering and the like according to the characteristics of different sound source signals in the standard sound signal library, and the identification result is displayed through the display unit, so that a user can conveniently understand the characteristic information of the third sound signal. The identification result in this embodiment includes one or more types, which may be to identify the type of the third sound signal obtained this time according to the standard sound signal library, for example, cardiopulmonary sound or respiratory sound, or identify a user corresponding to the third sound signal obtained this time according to sound signal information of multiple users stored in the storage unit, so as to facilitate health management of the user, or may be to identify and judge whether the third sound signal acquired this time by a user is too different from previous similar sound signals of the user stored in the standard sound signal library, so as to assist the user in judging whether the third sound signal acquired this time is credible or has obvious change. For example, when the noise interference caused by the environmental sound signal is too large, the frequency and amplitude of the third sound signal obtained this time may be obviously different from those of the previously stored sound signal, the difference is quantized through AI or other conventional algorithms, the user may set a difference threshold as needed, the third sound signal exceeding the threshold range is identified as unavailable, and the user is prompted to re-collect the third sound signal. By the method, the effect of self health management of the user by using the electronic auscultation system can be greatly improved, and the method is particularly suitable for family life scenes, and the user can well observe and understand the obtained sound signals without professional auscultation technology and knowledge.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more particular description of the invention than is possible with reference to the specific embodiments, and the specific embodiments of the invention are not to be considered as limited to those descriptions. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. A wireless stethoscope, comprising:

a sound source contact part for being attached to a body to be auscultated;

the sound source transmission part is provided with a cavity transmission channel, the cavity transmission channel is provided with a first end and a second end along the extension direction of the cavity transmission channel, the first end is connected with the sound source contact part, the length of the cavity transmission channel is 42 cm-50 cm, and the cavity transmission channel is a soft cavity transmission channel;

the sound source collecting part is connected with the second end and can collect sound in a frequency range of 20Hz to 50 Hz;

a sound source processing unit connected to the sound source collecting unit;

a sound source receiving unit wirelessly connected to the sound source processing unit;

the sound source contact portion includes: the operation portion and the contact site that are connected, sound source transmission portion with the operation portion is connected, the operation portion is used for supplying the user operation the sound source contact site, the contact site is used for laminating in by the auscultation body, the top surface of operation portion extremely the distance of the bottom surface of contact site is between 20mm to 30mm, the operation portion is the metal material.

2. The wireless stethoscope of claim 1, wherein the distance from the top surface of said operating portion to the bottom surface of said contact portion in a direction perpendicular to the contact surface of said contact portion is between 20mm and 30 mm.

3. The wireless stethoscope of claim 1, wherein said contact portion comprises a suspended membrane.

4. The wireless stethoscope according to claim 1, wherein said sound source processing unit is provided with a noise reducing MIC.

5. The wireless stethoscope of claim 1, further comprising a metal connecting tube, said metal connecting tube being connected at one end to said sound source contact portion and at the other end to said first end.

6. The wireless stethoscope according to any one of claims 1 to 5, wherein said sound source contact portion is a stethoscope probe, said sound source transmission portion is a hose, said sound source collecting portion is a sound pick-up, said sound source processing portion comprises a control circuit board, said control circuit board is provided with a wireless communication module, said sound source receiving portion is a wireless earphone, and said wireless earphone is wirelessly connected to said wireless communication module.

7. The wireless stethoscope of claim 6 wherein said flexible tube is a latex or rubber flexible tube.

8. The wireless stethoscope of claim 6, wherein said wireless communication module is a bluetooth audio communication module and said wireless headset is a bluetooth headset.

9. The wireless stethoscope of claim 6, wherein said sound pick-up is one of a resistive, capacitive, electromagnetic or piezoelectric based microphone.

10. The wireless stethoscope of claim 9, wherein said sound pick-up is a capacitive electret microphone.

11. The wireless stethoscope of claim 10, wherein said condenser electret microphone is a unidirectional condenser electret microphone.

12. The wireless stethoscope according to claim 6, wherein said control circuit board further comprises a microprocessor, a memory module, a signal amplification filter circuit, a battery, a wireless connection status indication LED, a power-on status indication LED, a button, a charging or external power interface, said microprocessor is electrically connected to said memory module, said signal amplification filter circuit, said battery, said wireless connection status indication LED, said power-on status indication LED, said button, said charging or external power interface, said microphone is electrically connected to said signal amplification filter circuit, and said microprocessor of said wireless communication module is integrated into said microprocessor.

13. The wireless stethoscope according to claim 6, wherein said control circuit board further comprises a microprocessor, a memory module, a signal amplification filter circuit, a battery, a wireless connection status indication LED, a power-on status indication LED, a button, a charging or external power interface, said microprocessor is electrically connected to said memory module, said signal amplification filter circuit, said battery, said wireless connection status indication LED, said power-on status indication LED, said button, said charging or external power interface, said wireless communication module, and said microphone is electrically connected to said signal amplification filter circuit.

14. The wireless stethoscope of claim 12 or 13, wherein said control circuit board further comprises an audio output port, said audio output port being connected to said microprocessor and/or said signal amplification filter circuit.

15. The wireless stethoscope according to claim 12 or 13, wherein said microprocessor is integrated with a charging management, digital noise reduction, wireless connection status indication LED and power-on status indication LED, signal acquisition, and key management microprocessor.

16. The wireless stethoscope according to claim 1, wherein said sound source receiving unit comprises at least two sound source receiving units, each of said sound source receiving units being capable of being wirelessly connected to said sound source processing unit, each of said sound source receiving units being adapted to be worn by a user.

17. The wireless stethoscope according to claim 16, wherein said sound source processing unit comprises wireless audio transmitters, each of said sound source receiving units being capable of wirelessly connecting with said wireless audio transmitter.

18. The wireless stethoscope of claim 17, wherein each of said sound source receiving portions is a wireless earphone, each of said wireless earphones being capable of wirelessly connecting with said wireless audio transmitter.

19. The wireless stethoscope of claim 17, further comprising at least one wireless audio receiver, said wireless audio receiver being wirelessly connected to said wireless audio transmitter, each of said sound source receiving portions being a wired earphone, each of said wired earphones being capable of wired connection to said wireless audio receiver.

20. The wireless stethoscope of claim 17, further comprising at least one wireless audio receiver wirelessly connected to said wireless audio transmitter, one of said at least two sound source receivers being wired headphones and the other being wireless headphones, said wireless headphones being wirelessly connectable to said wireless audio transmitter, said wired headphones being wiredly connectable to said wireless audio receiver.

21. The wireless stethoscope of any one of claims 17-20, wherein said wireless audio transmitter incorporates a high-pass CRS8670 bluetooth chip or a high-pass CRS8675 bluetooth chip.

22. The wireless stethoscope according to claim 1, wherein said sound source processing unit comprises a signal amplifying and filtering circuit, said signal amplifying and filtering circuit comprising a pre-amplifying circuit and a band-pass filtering circuit, said signal amplifying and filtering circuit having a pass band cut-off frequency of 24Hz to 3332Hz and an overall pass band amplification gain of 34.8dB.

23. The wireless stethoscope of claim 22, wherein said preamplifier circuit includes a band pass filter, said band pass filter circuit including at least one band pass filter, each of said band pass filters being identical in composition.

24. The wireless stethoscope of claim 23, wherein said pre-amplification circuit has a passband cutoff frequency of 12Hz to 9500Hz and a passband amplification gain of 24dB; the band-pass filter circuit comprises three band-pass filters, the cut-off frequency of the pass band of each band-pass filter is 10Hz to 7000Hz, and the amplification gain of the pass band is 3.6dB.

25. The wireless stethoscope of claim 1, further comprising a sound-proof cover disposed around said sound source contact portion and adapted to be attached to said body to be auscultated.

26. The wireless stethoscope of claim 25, further comprising a stethoscope handle extending in a first direction perpendicular to the contact surface of said sound source contact portion and said stethoscope body, wherein said stethoscope handle extends into said sound-proof housing at one end and is positioned outside said sound-proof housing at the other end for manipulation of said sound source contact portion by a user.

27. The wireless stethoscope of claim 26, wherein said stethoscope handle is a hollow tubular body, said hollow tubular body comprising a first portion, a second portion and a third portion connected in said first direction, said first portion being connected to said sound-pick-up cavity of said sound source contacting portion, said second portion being connected to said sound-proof housing, said third portion being connected to said sound source transmitting portion.