CN219803729U - Noise reduction stethoscope - Google Patents

Abstract

The utility model discloses a noise reduction stethoscope, which comprises: a radio receiver, a conductive portion connected to the radio receiver, and a listening device connected to the radio receiver through the conductive portion, the radio receiver comprising: piezoelectric thin film sensor and signal processing circuit, the listening device includes: the earphone and the sound-proof earmuff, wherein the piezoelectric film sensor is connected with the signal processing circuit, the piezoelectric film sensor is configured to convert a pressure signal generated by a target object into an electric signal, and the signal processing circuit is configured to convert the electric signal into a digital signal; the earphone is connected with the signal processing circuit through the conducting part and is configured to convert the digital signal into an analog signal and amplify the analog signal; and the sound insulation earmuffs are wrapped outside the earphone and are configured to block external noise.

Description

Noise reduction stethoscope

Technical Field

The utility model relates to the field of medical instruments, in particular to a noise reduction stethoscope.

Background

With the continuous development of medical technology, the requirements on medical instruments are also increasing. The stethoscope is used as an initial sign of modern medicine, is not only a common tool for medical staff, but also one of the tools essential for the medical staff to diagnose diseases of patients.

The existing stethoscopes mostly consist of a radio, a conduction part and a listening device. The using method of the existing stethoscope comprises the following steps: first, the healthcare worker places the radio in the chest of the patient. Then, after the acoustic wave in the patient's body excites the membrane cavity, the aluminum membrane of the radio also vibrates, thereby generating an acoustic wave signal. Further, the acoustic wave signal is transmitted to the listening device through the transmitting portion, so that the medical staff can diagnose the abnormality in the patient's body through the listening device based on the frequency of the acoustic wave signal.

As can be seen from the above description, most of the stethoscopes currently used by medical staff transmit sound wave signals, so when the medical staff needs to use the stethoscopes to diagnose illness of patients in special environments (such as outdoors with noisy sound or on trains with large bombing sound), external noise may influence the transmission of sound wave signals of the stethoscopes, thereby affecting the diagnosis of illness by the medical staff.

For the above-mentioned prior art, most of the conventional stethoscopes transmit acoustic signals, so when medical staff needs to use the stethoscopes in special environments, external noise may affect the transmission of acoustic signals of the stethoscopes, thereby affecting the technical problem of diagnosing diseases of the medical staff, and no effective solution has been proposed at present.

Disclosure of Invention

The utility model provides a noise reduction stethoscope, which at least solves the technical problems that the transmission of sound wave signals of the stethoscope is possibly influenced by external noise when medical staff need to use the stethoscope in a special environment because most of the conventional stethoscopes transmit sound wave signals in the prior art, thereby influencing the diagnosis of diseases by the medical staff.

According to one aspect of the present utility model, there is provided a noise reducing stethoscope comprising: a radio receiver, a conductive portion connected to the radio receiver, and a listening device connected to the radio receiver through the conductive portion, the radio receiver comprising: piezoelectric thin film sensor and signal processing circuit, the listening device includes: the earphone and the sound-proof earmuff, wherein the piezoelectric film sensor is connected with the signal processing circuit, the piezoelectric film sensor is configured to convert a pressure signal generated by a target object into an electric signal, and the signal processing circuit is configured to convert the electric signal into a digital signal; the earphone is connected with the signal processing circuit through the conducting part and is configured to convert the digital signal into an analog signal and amplify the analog signal; and the sound insulation earmuffs are wrapped outside the earphone and are configured to block external noise.

Optionally, the signal processing circuit comprises: an a/D converter, a filter, and an audio processor, wherein the a/D converter is connected to the piezoelectric thin film sensor and configured to convert the electrical signal into a digital signal; the filter is connected with the A/D converter and is configured to filter noise; and the audio processor is connected with the filter and is configured for processing the digital signal.

Optionally, the piezoelectric thin film sensor includes: the piezoelectric device comprises a diaphragm, a silica gel column, a piezoelectric film, a metal shell and a first lead, wherein the diaphragm is connected with the piezoelectric film through the silica gel column; the piezoelectric film is arranged in the metal shell; and the piezoelectric film is connected with the first wire.

Optionally, the radio comprises: and the shell is of a circular structure with one side open.

Optionally, the piezoelectric thin film sensor and the signal processing circuit are disposed inside a housing configured to protect the piezoelectric thin film sensor and the signal processing circuit.

Optionally, the radio further comprises: a flexible protective film, wherein the flexible protective film is connected with the piezoelectric thin film sensor; the flexible protective film is lapped at the opening of the shell and is configured to protect the piezoelectric film sensor.

Optionally, the conductive portion comprises: and a second wire connected with the audio processor.

Optionally, the conductive portion further comprises: third wire and fourth wire, sound-proof earmuff includes: first sound-proof ear muff and second sound-proof ear muff, earphone includes: the first earphone and the second earphone, wherein one end of the third wire and one end of the fourth wire are respectively connected with the second wire; the other end of the third wire is connected with the first earphone through the first sound-insulation earmuff; and the other end of the fourth wire is connected with the second earphone through the second sound insulation earmuff.

Optionally, the listening device further comprises: and the flexible frame, wherein one end of the flexible frame is connected with the first sound-proof earmuff, and the other end of the flexible frame is connected with the second sound-proof earmuff and is configured to be connected with the first sound-proof earmuff and the second sound-proof earmuff.

The embodiment of the utility model provides a noise reduction stethoscope, and the radio of the noise reduction stethoscope is provided with a piezoelectric film sensor and a signal processing circuit. Different from the traditional stethoscope which collects and transmits sound wave signals, the piezoelectric film sensor can collect pressure signals generated at the measured position of a target object and convert the pressure signals into electric signals, and the signal processing circuit converts the electric signals into digital signals, so that when an operator auscultates by using the stethoscope of the stethoscope, external noise cannot influence the stethoscope, namely, the diagnosis of diseases by the operator cannot be influenced. Furthermore, because the stethoscope of the stethoscope is provided with the earphone and the sound-insulation earmuffs wrapped outside the earphone, an operator can isolate external noise from the outside when auscultates by using the stethoscope, and the influence of the external noise on disease diagnosis is avoided. Therefore, the technical effect that the diagnosis of the medical staff on the diseases is not influenced by external noise is achieved through the product structure. Therefore, the problem that the transmission of the sound wave signals of the stethoscope is possibly influenced by external noise when medical staff need to use the stethoscope in a special environment because most of the conventional stethoscopes transmit sound wave signals in the prior art is solved, and the technical problem of disease diagnosis of the medical staff is influenced.

The above, as well as additional objectives, advantages, and features of the present utility model will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present utility model when read in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the utility model will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:

FIG. 1 is a schematic diagram of a noise reducing stethoscope according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a radio receiver according to an embodiment of the present utility model;

FIG. 3 is a schematic view of an earphone and a sound-insulating earmuff wrapped around the earphone according to an embodiment of the utility model;

FIG. 4 is a schematic block diagram of a piezoelectric thin film sensor, a signal processing circuit and an earphone according to an embodiment of the present utility model;

fig. 5 is a schematic view of the internal structure of a piezoelectric thin film sensor according to an embodiment of the present utility model.

Description of the embodiments

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the utility model described herein are, for example, capable of operation in other environments. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

Fig. 1 is a schematic view of a noise reducing stethoscope according to an embodiment of the present utility model. Fig. 2 is a cross-sectional view of a radio receiver 100 according to an embodiment of the utility model. Fig. 3 is a schematic diagram of the earphones 311, 312 and the sound-proof earmuffs 321, 322 wrapped around the earphone according to the embodiment of the present utility model. Fig. 4 is a schematic block diagram of the piezoelectric thin film sensor 110, the signal processing circuit 120, and the ear phones 311, 312 according to an embodiment of the present utility model.

Referring to fig. 1, 2, 3 and 4, a noise reducing stethoscope includes: radio receiver 100, conductive portion 200 connected to radio receiver 100, and listening device 300 connected to radio receiver 100 through conductive portion 200, radio receiver 100 comprises: the piezoelectric thin film sensor 110 and the signal processing circuit 120, and the listening device 300 includes: headphones 311, 312 and soundproof earmuffs 321, 322, wherein the piezoelectric film sensor 110 is connected to the signal processing circuit 120, the piezoelectric film sensor 110 being configured to convert a pressure signal generated by a target object into an electrical signal, the signal processing circuit 120 being configured to convert the electrical signal into a digital signal; the headphones 311, 312 are connected to the signal processing circuit 120 through the conductive portion 200, configured to convert digital signals into analog signals, and amplify the analog signals; and sound-proof earmuffs 321, 322 are wrapped around the exterior of the earphones 311, 312 and configured to block external noise.

As described in the background, existing stethoscopes are mostly composed of a radio receiver, a conductive part, and a listening device. The using method of the existing stethoscope comprises the following steps: first, the healthcare worker places the radio in the chest of the patient. Then, after the acoustic wave in the patient's body excites the membrane cavity, the aluminum membrane of the radio also vibrates, thereby generating an acoustic wave signal. Further, the acoustic wave signal is transmitted to the listening device through the transmitting portion, so that the medical staff can diagnose the abnormality in the patient's body through the listening device based on the frequency of the acoustic wave signal.

As can be seen from the above description, most of the stethoscopes currently used by medical staff transmit sound wave signals, so when the medical staff needs to use the stethoscopes to diagnose illness of patients in special environments (such as outdoors with noisy sound or on trains with large bombing sound), external noise may influence the transmission of sound wave signals of the stethoscopes, thereby affecting the diagnosis of illness by the medical staff.

In view of this, the present utility model provides a noise reducing stethoscope. The sound receiver 100 of the noise reducing stethoscope includes a piezoelectric film sensor 110 and a signal processing circuit 120. The piezoelectric film sensor 110 is connected to the signal processing circuit 120, and the piezoelectric film sensor 110 is used for converting a pressure signal generated at a detected position of a target object (for example, a chest diaphragm of a patient) into an electrical signal, and the signal processing circuit 120 is used for converting the electrical signal into a digital signal. The headphones 311, 312 are connected to the signal processing circuit 120 through the conductive part 200 for converting the received digital signal into an analog signal and amplifying the analog signal. And the sound insulation earmuffs 321, 322 are wrapped outside the earphones 311, 312 for blocking external noise.

For example, the target object is the chest of a patient. First, the healthcare worker places the stethoscope's radio 100 at the chest of the patient. And because the patient's chest diaphragm generates a pressure signal due to physical activity (e.g., pressure signal due to heart beating or pressure signal due to respiration, etc.), the pressure membrane sensor 110 of the listening device 300 converts the acquired pressure signal into an electrical signal and transmits the electrical signal to the signal processing circuit 120 when the patient's chest diaphragm generates physical activity.

After receiving the electrical signal, the signal processing circuit 120 converts the electrical signal into a digital signal and processes the digital signal. The digital signal is transferred to the headphones 311, 312 through the conductive part 200, and the headphones 311, 312 convert the digital signal into an analog signal and amplify the analog signal. So that the health care provider can hear sounds generated in the chest of the patient due to physical activities through the headphones 311, 312.

Further, since the sound insulation earmuffs 321 and 322 are arranged outside the earphones 311 and 312, external noise can be further isolated, and the medical staff is ensured not to be interfered by the external noise when auscultating.

Unlike the conventional stethoscope which collects and transmits acoustic signals, the piezoelectric film sensor 110 can collect pressure signals generated at the measured position of the target object and convert the pressure signals into electrical signals, and the signal processing circuit 120 converts the electrical signals into digital signals, so that when an operator auscultates with the stethoscope 300, external noise does not affect the stethoscope 300, i.e., the diagnosis of diseases by the operator is not affected. Further, since the stethoscope 300 of the stethoscope is provided with the earphones 311 and 312 and the sound-proof earmuffs 321 and 322 wrapped outside the earphones 311 and 312, an operator can isolate external noise from the outside when auscultates by using the stethoscope, and the influence of the external noise on disease diagnosis is avoided. Therefore, the technical effect that the diagnosis of the medical staff on the diseases is not influenced by external noise is achieved through the product structure. Therefore, the problem that the transmission of the sound wave signals of the stethoscope is possibly influenced by external noise when medical staff need to use the stethoscope in a special environment because most of the conventional stethoscopes transmit sound wave signals in the prior art is solved, and the technical problem of disease diagnosis of the medical staff is influenced.

Optionally, the signal processing circuit 120 includes: an a/D converter 121, a filter 122, and an audio processor 123, wherein the a/D converter 121 is connected to the piezoelectric thin film sensor 110 and configured to convert an electrical signal into a digital signal; the filter 122 is connected to the a/D converter 121 and configured to filter noise; and an audio processor 123 is coupled to the filter 122 and configured to process the digital signal.

Specifically, referring to fig. 4, after receiving the electric signal transmitted by the piezoelectric thin film sensor 110, the a/D converter 121 converts the electric signal into a digital signal and transmits the digital signal to the filter 122 connected thereto. The filter 122 then leaves only the signal of a specific frequency among the digital signals, filters other signals than the signal of the specific frequency, and passes the filtered digital signal to the audio processor 123 connected thereto. The audio processor 123 performs a processing on the reserved digital signal on performance such as tone and the like, and delivers the digital signal to the headphones 311, 312 through the conductive portion 200.

Optionally, the piezoelectric thin film sensor 110 includes: the piezoelectric film comprises a diaphragm 111, a silica gel column 112, a piezoelectric film 113, a metal shell 114 and a first lead 115, wherein the diaphragm 111 is connected with the piezoelectric film 113 through the silica gel column 112; the piezoelectric film 113 is disposed inside the metal case 114; and the piezoelectric film 113 is connected to the first wire 115.

Specifically, fig. 5 is a schematic diagram of the internal structure of the piezoelectric thin film sensor 110 according to an embodiment of the present utility model. Referring to fig. 5, the piezoelectric film sensor 110 includes a diaphragm 111, a silica gel column 112, a piezoelectric film 113, a metal case 114, and a first wire 115.

First, since the diaphragm 111 is connected to the piezoelectric film 113 through the silica gel column 112, when the diaphragm 111 receives pressure due to vibration, a pressure signal is transmitted to the piezoelectric film 113 through the silica gel column 112. Then, the piezoelectric film 113 converts the pressure signal into an electrical signal, and transmits the electrical signal to the signal processing circuit 120 connected thereto through the first wire 115.

The metal case 114 is used to protect the piezoelectric film 113, and prevent the piezoelectric film 113 from being damaged by external force.

Optionally, the radio receiver 100 includes: and a housing 130, wherein the housing 130 has a circular structure with one side opened. Further alternatively, the piezoelectric thin film sensor 110 and the signal processing circuit 120 are provided inside the housing 130, and the housing 130 is configured to protect the piezoelectric thin film sensor 110 and the signal processing circuit 120. Further optionally, the radio receiver 100 further comprises: and a flexible protection film 140, wherein the flexible protection film 140 is connected with the piezoelectric thin film sensor 110, and the flexible protection film 140 is lapped at the opening of the shell 130 and is configured to protect the piezoelectric thin film sensor 110.

Specifically, the radio receiver 100 includes a housing 130, wherein the housing 130 has a circular structure with one side opened. And referring to fig. 2, the piezoelectric thin film sensor 110 and the signal processing circuit 120 connected to the piezoelectric thin film sensor 110 are disposed inside the housing 130, so that the housing 130 can protect the piezoelectric thin film sensor 110 and the signal processing circuit 120 from being pressed by the piezoelectric thin film sensor 110 and the signal processing circuit 120. And a flexible protective film 140 is further overlapped at the opening of the case 130. The flexible protective film 140 insulates the piezoelectric thin film sensor 110 and the signal processing circuit 120 inside the case 130, thereby achieving the technical effect of protecting the piezoelectric thin film sensor 110 and the signal processing circuit 120.

Further, the flexible protection film 140 is connected to the piezoelectric thin film sensor 110, so that the flexible protection film 140 can transmit a pressure signal to the piezoelectric thin film sensor 110.

Optionally, the conductive portion 200 includes: a second conductor 210 connected to the audio processor 123. Further optionally, the conductive portion 200 further includes: the third and fourth wires 220, 230, and the soundproof earmuffs 321, 322 include: the first sound-proof earmuffs 321 and the second sound-proof earmuffs 322, the headphones 311, 312 comprise: a first earphone 311 and a second earphone 312, wherein one ends of the third wire 220 and the fourth wire 230 are connected to the second wire 210, respectively; the other end of the third wire 220 is connected to the first earphone 311 through a first soundproof ear cup 321; and the other end of the fourth wire 230 is connected to the second earphone 312 through a second soundproof ear cup 322.

Specifically, referring to fig. 1, the conductive portion 200 includes a second conductive line 210, a third conductive line 220, and a fourth conductive line 230. One end of the second wire 210 is connected to the radio receiver 100, and the other end of the second wire 210 is connected to the third wire 220 and the fourth wire 230, respectively. Further, since the third wire 220 is connected to the first earphone 311 through the first soundproof earcap 321, the digital signal generated by the radio receiver 100 according to the pressure signal can be transferred to the first earphone 311 through the second wire 210 and the third wire 220.

As described above, since the fourth wire 230 is connected to the second earphone 312 through the second soundproof ear cup 322, the digital signal generated by the radio receiver 100 according to the pressure signal can be transferred to the second earphone 312 through the second wire 210 and the fourth wire 230.

Further, after the first earphone 311 and the second earphone 312 receive the digital signals, the digital signals are converted into analog signals. So that the medical staff can hear the sound made by the target object.

Optionally, the listening device 300 further comprises: and a flexible frame 330, wherein one end of the flexible frame 330 is connected to the first soundproof ear cup 321, and the other end of the flexible frame 330 is connected to the second soundproof ear cup 322, and is configured to connect the first soundproof ear cup 321 and the second soundproof ear cup 322.

Specifically, referring to fig. 1, listening device 300 further includes a flexible frame 330. One end of the flexible frame 330 is connected to the first sound-proof ear cup 321, and the other end is connected to the second sound-proof ear cup 322. So that the flexible carrier 330 can connect the first sound-insulating ear cup 321 and the second sound-insulating ear cup 322 together.

Further, since the flexible frame 330 is bendable, the flexible frame 330 can be adapted to the shape of the head of the medical staff to the maximum extent when the medical staff wears the listening device 300, thereby ensuring the comfort of the medical staff wearing the listening device 300.

The embodiment of the utility model provides a noise reduction stethoscope, and a radio 100 of the noise reduction stethoscope is provided with a piezoelectric film sensor 110 and a signal processing circuit 120. Unlike the conventional stethoscope which collects and transmits acoustic signals, the piezoelectric film sensor 110 can collect pressure signals generated at the measured position of the target object and convert the pressure signals into electrical signals, and the signal processing circuit 120 converts the electrical signals into digital signals, so that when an operator auscultates with the stethoscope 300, external noise does not affect the stethoscope 300, i.e., the diagnosis of diseases by the operator is not affected. Further, since the stethoscope 300 of the stethoscope is provided with the earphone and the sound-proof earmuffs 321 and 322 wrapped outside the earphone 311 and 312, an operator can isolate external noise from the outside when auscultating by the stethoscope, thereby avoiding influence of the external noise on disease diagnosis. Therefore, the technical effect that the diagnosis of the medical staff on the diseases is not influenced by external noise is achieved through the product structure. Therefore, the problem that the transmission of the sound wave signals of the stethoscope is possibly influenced by external noise when medical staff need to use the stethoscope in a special environment because most of the conventional stethoscopes transmit sound wave signals in the prior art is solved, and the technical problem of disease diagnosis of the medical staff is influenced.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims (9)

1. A noise reducing stethoscope comprising: radio receiver (100), a conductive part (200) connected to the radio receiver (100), and a listening device (300) connected to the radio receiver (100) through the conductive part (200), characterized in that the radio receiver (100) comprises: a piezoelectric thin film sensor (110) and a signal processing circuit (120), the listening device (300) comprising: earphone (311, 312) and sound-proof earmuff (321, 322), wherein

The piezoelectric thin film sensor (110) is connected with the signal processing circuit (120), the piezoelectric thin film sensor (110) is configured to convert a pressure signal generated by a target object into an electrical signal, and the signal processing circuit (120) is configured to convert the electrical signal into a digital signal;

the earphone (311, 312) is connected to the signal processing circuit (120) through the conducting portion (200) and is configured to convert a digital signal into an analog signal and amplify the analog signal; and

the sound-proof earmuffs (321, 322) are wrapped outside the earphones (311, 312) and are configured to block external noise.

2. The noise reducing stethoscope of claim 1, wherein said signal processing circuit (120) comprises: an A/D converter (121), a filter (122), and an audio processor (123), wherein

The A/D converter (121) is connected with the piezoelectric film sensor (110) and is configured to convert an electric signal into a digital signal;

the filter (122) is connected with the A/D converter (121) and is configured to filter noise; and

the audio processor (123) is connected to the filter (122) and is configured to process digital signals.

3. The noise reducing stethoscope according to claim 1, wherein the piezoelectric film sensor (110) comprises: a membrane (111), a silica gel column (112), a piezoelectric film (113), a metal housing (114) and a first wire (115), wherein

The membrane (111) is connected with the piezoelectric film (113) through the silica gel column (112);

the piezoelectric film (113) is provided inside the metal case (114); and

the piezoelectric film (113) is connected to the first wire (115).

4. The noise reducing stethoscope according to claim 1, wherein the radio (100) comprises: a housing (130) in which

The housing (130) has a circular structure with one side open.

5. The noise reducing stethoscope of claim 4, wherein the piezoelectric film sensor (110) and the signal processing circuit (120) are disposed inside the housing (130), the housing (130) being configured to protect the piezoelectric film sensor (110) and the signal processing circuit (120).

6. The noise reducing stethoscope of claim 5, wherein said radio (100) further comprises: a flexible protective film (140), wherein

The flexible protective film (140) is connected with the piezoelectric thin film sensor (110);

the flexible protective film (140) is lapped at the opening of the shell (130) and is configured to protect the piezoelectric film sensor (110).

7. The noise reducing stethoscope according to claim 2, wherein the conductive portion (200) comprises: a second wire (210) connected to the audio processor (123).

8. The noise reducing stethoscope of claim 7, wherein the conductive portion (200) further comprises: a third wire (220) and a fourth wire (230), the sound-proof earmuffs (321, 322) comprising: a first sound-proof earmuff (321) and a second sound-proof earmuff (322), the earphone (311, 312) comprising: a first earphone (311) and a second earphone (312), wherein

One end of the third wire (220) and one end of the fourth wire (230) are respectively connected with the second wire (210);

the other end of the third wire (220) is connected with the first earphone (311) through the first sound insulation earmuff (321); and

the other end of the fourth wire (230) is connected with the second earphone (312) through the second sound insulation earmuff (322).

9. The noise reducing stethoscope of claim 8, wherein said listening device (300) further comprises: a flexible carrier (330), wherein

One end of the flexible frame (330) is connected with the first sound-proof earmuff (321), the other end of the flexible frame (330) is connected with the second sound-proof earmuff (322), and the flexible frame is configured to connect the first sound-proof earmuff (321) and the second sound-proof earmuff (322).