CN109793533A - A kind of Simple electronic stethoscope - Google Patents
A kind of Simple electronic stethoscope Download PDFInfo
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- CN109793533A CN109793533A CN201910008027.8A CN201910008027A CN109793533A CN 109793533 A CN109793533 A CN 109793533A CN 201910008027 A CN201910008027 A CN 201910008027A CN 109793533 A CN109793533 A CN 109793533A
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- heart
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- auscultation
- lung sounds
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Abstract
The invention discloses a kind of Simple electronic stethoscopes, including auscultation head, the auscultation head auscultates switch connection with the first auscultation switch and second respectively by conduction sebific duct, the first auscultation switch is connect by conducting sebific duct with audition earplug, the second auscultation switch is connect by conducting sebific duct with sound collection sensor, and the sound collection sensor is connect with processing module aggregate device.The present invention can independently be selected convenient for user according to use habit and demand, and have simple structure, feature low in cost simultaneously using electronic auscultation and common auscultation both of which；Heart and lung sounds signal is transmitted to sound collection sensor in a manner of Air Coupling by electronic auscultation mode, and pass through digital data transmission module and human-computer interaction module, a variety of different terminals can be accessed, it reaches portable or high-precision and the different purposes such as uses, be suitable for the various aspects such as clinical diagnosis, medical teaching.
Description
Technical field
The present invention relates to the field of medical instrument technology, and in particular to a kind of Simple electronic stethoscope.
Background technique
Stethoscope is as more frequent medical instrument is used in modern medicine, in cardiovascular and cerebrovascular disease, respiratory system disease
It is of great significance in disease diagnosis.And because conventional stethoscope can not store playback, be unable to wirelessly transmitting data, environment resistant do
Disturb the disadvantages of ability is poor, limit stethoscope tele-medicine, in terms of use.Therefore, electronic auscultation device
Research has great importance.Current electronic auscultation device is studied by countries in the world, and is had some products and put goods on the market.
The country develops relatively slowly in terms of electronic auscultation device product, and domestic electronic auscultation device is very few on the market at present.Its
The middle safe company in Qinhuangdao has developed a series of multifunctional visible electronic auscultation devices, which listens
Examine, electrocardiogram acquisition, blood oxygen and pulse frequency are detected on one, export auscultated voice signal by earphone, auscultation volume is adjustable,
But do not have the functions such as storage playback, wireless transmission, and its " visual " is not necessarily referring to display heart and lung sounds waveform but ecg wave form,
More interference also it has been mingled in auscultatory sound simultaneously, also the host computer of signal does not handle the functions such as simple diagnosis.
External aspect, Think Labs company are proposed a electronic auscultation device, and configuration design breaches conventional acoustic
Stethoscopic appearance limitation, so that electronic auscultation device is more portable, beautiful, practical, but the electronic auscultation device function is relatively single,
And do not have wireless transmission function.The 3M company of conventional stethoscope field industry mark post also has developed a series of electronic auscultation devices,
Wherein with3200 type Bluetooth electronic stethoscopes are representative, which continues the stethoscopic surface structure of conventional acoustic,
An outstanding stethoscope family is formd with other stethoscopes of 3M.Electronic auscultation device has storage playback, wireless communication etc.
Function, while it being also added into environment resistant noise technique (Adaptive Noise Reduction, ANR), it utmostly can be by ring
Border noise reduces by 75%, greatly strengthens auscultation validity.Compared with most excellent conventional acoustic stethoscope, voice signal can be put
It is 24 times big.External electronic auscultation device product is more mature, but its price is also sufficiently expensive at the same time, the electronic auscultation device price
8800 yuan are up to about, while the electronic auscultation device is but extremely limited in the storage time and storage song quantity of auscultatory sound, together
When do not do signal analysis yet and realize the functions such as simple diagnosis exception heart sound.
Summary of the invention
Goal of the invention: it is an object of the present invention to provide a kind of Simple electronic stethoscopes, by crucial modules and the heart
Lung Sounds analysis processing etc. improves, and compared with prior art, can effectively solve the problem that more noise, storage time and storage are bent
Mesh is small, high cost problem, while realizing that the wire and wireless of cardiechema signals is transmitted and can be shown to heart and lung sounds signal data
Show and analyze the result for providing diagnosis.
Technical solution: a kind of Simple electronic stethoscope of the present invention, including auscultation head, the auscultation head pass through conduction sebific duct point
It is not connected with the first auscultation switch and the second auscultation switch, the first auscultation switch is connected by conduction sebific duct and audition earplug
It connects, the second auscultation switch is connect by conducting sebific duct with sound collection sensor, the sound collection sensor and processing
The connection of module collection device.
It further, include signal processing module, human-computer interaction module and number letter in the processing module aggregate device
Number transmission module, the human-computer interaction module are connect with signal processing module and digital signal transmission module respectively, the sound
Acquisition sensor is connect with signal processing module.
Further, the signal processing module is by pre-amplifier module, low pass filter blocks, operational amplifier mould
Block and coding/decoding module composition, the pre-amplifier module, low pass filter blocks, operational amplifier module and encoding and decoding mould
Block is sequentially connected, to realize the pretreatment and digitlization to original heart and lung sounds audio signal.
Further, the coding/decoding module includes analog-to-digital conversion module for exporting digital audio and video signals and for defeated
The D/A converter module of analog audio signal out.
Further, the digital data transmission module includes Bluetooth communication modules, Wifi transmission module and USB interface.
Further, the human-computer interaction module includes single-chip microcontroller and display, and single-chip microcontroller is handled it by the display
Heart and lung sounds signal waveform and heart rate afterwards is by indicator screen real-time display, and the single-chip microcontroller further includes timer, so that electric
Sub- stethoscope has the characteristics that portable and inexpensive.
Further, the human-computer interaction module includes computer, and the computer is to the heart after signal processing module processing
Lung Sounds real-time display waveform, and analysis and display parameters are carried out by algorithm；The algorithm carries out analytic process are as follows:
(1) heart and lung sounds signal after signal processing module processing is carried out at hard -threshold noise reduction using wavelet de-noising algorithm
Reason；
(2) by shannon energy algorithm extract noise reduction after heart and lung sounds signal envelope, obtain signal shannon energy figure and
Time gate figure；At the same time, the power spectrumanalysis under autoregression model is carried out to heart and lung sounds signal after noise reduction by Burg algorithm,
Obtain the spectrogram of signal；
(3) it by the heart and lung sounds separation algorithm based on blind source signal, is covered using Non-negative Matrix Factorization, clustering and time-frequency
Hum Lung Sounds in heart and lung sounds signal are separated, obtain cardiechema signals by the mode of code；
(4) by heart sound anomaly analysis algorithm, and existing spectrogram, shannon energy figure and time gate figure are combined, from upper
It states and extracts first heart sound and second heart sound in cardiechema signals, then calculate the time difference of adjacent peak in shannon energy figure, obtain
To the analysis result to heart sound.
The utility model has the advantages that compared with prior art, the present invention due to the improvement of sound collection sensor, the filter of audio coding decoding
Involve processing of the modules such as analog-to-digital conversion, human-computer interaction module to heart and lung sounds signal, can be realized heart and lung sounds double mode auscultation,
The wire and wireless transmission of heart and lung sounds signal, real-time display heart and lung sounds waveform, the heart and lung sounds based on PC machine show, heart and lung sounds separation and
Simple diagnosis has the characteristics that sound clarity, auscultation mode plurality of optional, diagnostic analysis accuracy rate are high.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the structural schematic diagram of processing module aggregate device.
Specific embodiment
The present invention is described further with reference to the accompanying drawings and examples:
As depicted in figs. 1 and 2, a kind of Simple electronic stethoscope of the present invention, including auscultation head 1, auscultation head 1 pass through conductive glue
Pipe is connect with the first auscultation switch 2 and the second auscultation switch 3 respectively, and the first auscultation switch 2 passes through conduction sebific duct and audition earplug 4
Connection, the second auscultation switch 3 are connect by conducting sebific duct with sound collection sensor 5, sound collection sensor 5 and processing module
Aggregate device 6 connects, and user can be simultaneously using electronic auscultation and common auscultation both of which, convenient for user according to use habit
It is independently selected with demand；Cardiopulmonary audio signal is transmitted to sound collection sensor 5, sound by auscultation head 1 by electronic auscultation mode
Sound acquisition sensor 5 has selected electret microphone, and electret microphone is converted two parts and formed by acoustic-electric conversion and impedance, sound
The key element of electricity conversion is electret vibrating membrane, when electret diaphragm encounters acoustic vibration, causes the electric field at capacitor both ends
It changes, to produce the alternating voltage for changing with sound wave and changing, cardiopulmonary audio signal can be converted to electric signal,
It is transferred to processing module aggregate device 6.
It include signal processing module 7, human-computer interaction module 8 and digital signal transmission module in processing module aggregate device 6
9, signal processing module 7 is by pre-amplifier module 71, low pass filter blocks 72, operational amplifier module 73 and encoding and decoding mould
Block 74 forms, and coding/decoding module 74 includes analog-to-digital conversion module for exporting digital audio and video signals and for exporting analogue audio frequency
The D/A converter module of signal, pre-amplifier module 71, low pass filter blocks 72, operational amplifier module 73 and encoding and decoding
Module 74 is sequentially connected, to realize the pretreatment and digitlization to heart and lung sounds signal；Human-computer interaction module 8 respectively with letter
Number processing module 7 and digital signal transmission module 9 connect, and sound collection sensor 5 is connect with signal processing module 7, i.e., with letter
Pre-amplifier module 71 in number processing module 7 connects.
Wherein signal processing module 7 use single fixed gain for 20dB, high s/n ratio, low energy consumption MAX9812 core
Piece carries out preposition amplification to heart and lung sounds signal；Then front-end voice acquisition sensor 5 is eliminated using first-order low-pass wave circuit to adopt
The high-frequency noise introduced when collecting signal；It has been further added by two-stage voltage follower, impedance matching can not only be played the role of, it is also suitable
When increasing ability of the circuit with dynamic load, and coding/decoding module is based on TLV320AIC3254 and carries out modulus to heart and lung sounds signal
Conversion and digital-to-analogue conversion, to realize the pretreatment and digitlization to heart and lung sounds signal.
Digital data transmission module 9 includes Bluetooth communication modules, Wifi transmission module and USB interface, Bluetooth communication modules
HC-08 Bluetooth communication modules have been selected, have had the characteristics that low in energy consumption, wireless transmission distance is long, size is small, Bluetooth transmission mould
Block, Wifi transmission module and USB interface realize the wire and wireless transmission of heart and lung sounds signal.
When human-computer interaction module 8 includes single-chip microcontroller and display, single-chip microcontroller selects STM32F405, passes through SPI serial line interface
0.96 cun of OLED display of connection, heart and lung sounds signal waveform after being handled by indicator screen real-time display single-chip microcontroller and
Heart rate, the single-chip microcontroller further include timer so that stethoscope have the characteristics that it is portable and inexpensive.
When human-computer interaction module 8 includes computer, computer shows the heart and lung sounds signal after the processing of signal processing module 7 in real time
Oscillography shape, and analysis and display parameters are carried out by algorithm；Its algorithm carries out analytic process are as follows:
(1) hard -threshold noise reduction is carried out using wavelet de-noising algorithm to the heart and lung sounds signal after the processing of signal processing module 7
Processing；
(2) by shannon energy algorithm extract noise reduction after heart and lung sounds signal envelope, obtain signal shannon energy figure and
Time gate figure；At the same time, the power spectrumanalysis under autoregression model is carried out to heart and lung sounds signal after noise reduction by Burg algorithm,
Obtain the spectrogram of signal；
(3) it by the heart and lung sounds separation algorithm based on blind source signal, is covered using Non-negative Matrix Factorization, clustering and time-frequency
Hum Lung Sounds in heart and lung sounds signal are separated, obtain cardiechema signals by the mode of code；
(4) by heart sound anomaly analysis algorithm, and existing spectrogram, shannon energy figure and time gate figure are combined, from upper
It states and extracts first heart sound and second heart sound in cardiechema signals, then calculate the time difference of adjacent peak in shannon energy figure, i.e.,
The time interval of splitting of heart sounds obtains the analysis to heart sound as a result, realizing the analysis to abnormal heart sound.
Compared with prior art, due to the improvement of sound collection sensor, the filtering of audio coding decoding and analog-to-digital conversion, people
Processing of the modules such as machine interactive module to heart and lung sounds signal can be realized the double mode auscultation of heart and lung sounds, heart and lung sounds signal has
Line wireless transmission, real-time display heart and lung sounds waveform, the heart and lung sounds based on PC machine are shown, heart and lung sounds separate and simple diagnosis, are had
Sound clarity, auscultation mode plurality of optional, the features such as diagnostic analysis accuracy rate is high.
Claims (7)
1. a kind of Simple electronic stethoscope, including auscultation head (1), the auscultation head (1) by conduction sebific duct respectively with first tin
Switch (2) and the second auscultation switch (3) connection are examined, described first auscultates switch (2) is connected by conduction sebific duct and audition earplug (4)
It connects, the second auscultation switch (3) is connect by conducting sebific duct with sound collection sensor (5), the sound collection sensor
(5) it is connect with processing module aggregate device (6).
2. a kind of Simple electronic stethoscope according to claim 1, it is characterised in that: the processing module aggregate device
It (6) include signal processing module (7), human-computer interaction module (8) and digital signal transmission module (9), the human-computer interaction mould in
Block (8) is connect with signal processing module (7) and digital signal transmission module (9) respectively, the sound collection sensor (5) and letter
The connection of number processing module (7).
3. a kind of Simple electronic stethoscope according to claim 2, it is characterised in that: the signal processing module (7) by
Pre-amplifier module (71), low pass filter blocks (72), operational amplifier module (73) and coding/decoding module (74) composition,
The pre-amplifier module (71), low pass filter blocks (72), operational amplifier module (73) and coding/decoding module (74)
It is sequentially connected.
4. a kind of Simple electronic stethoscope according to claim 3, it is characterised in that: the coding/decoding module (74) includes
D/A converter module for exporting the analog-to-digital conversion module of digital audio and video signals and for exporting analog audio signal.
5. a kind of Simple electronic stethoscope according to claim 2, it is characterised in that: the digital data transmission module
It (9) include Bluetooth communication modules, Wifi transmission module and USB interface.
6. a kind of Simple electronic stethoscope according to claim 2, it is characterised in that: human-computer interaction module (8) packet
Include single-chip microcontroller and display, the display single-chip microcontroller is handled after heart and lung sounds signal waveform and heart rate pass through display screen
Curtain real-time display, the single-chip microcontroller further includes timer.
7. a kind of Simple electronic stethoscope according to claim 2, it is characterised in that: human-computer interaction module (8) packet
Include computer, the computer signal processing module (7) are handled after heart and lung sounds signal real-time display waveform, and by algorithm into
Row analysis and display parameters；The algorithm carries out analytic process are as follows:
(1) heart and lung sounds signal after signal processing module (7) processing is carried out at hard -threshold noise reduction using wavelet de-noising algorithm
Reason；
(2) envelope that heart and lung sounds signal after noise reduction is extracted by shannon energy algorithm, obtains shannon energy figure and the time of signal
Men Tu；At the same time, the power spectrumanalysis under autoregression model is carried out to heart and lung sounds signal after noise reduction by Burg algorithm, obtained
The spectrogram of signal；
(3) by the heart and lung sounds separation algorithm based on blind source signal, Non-negative Matrix Factorization, clustering and time-frequency mask are utilized
Hum Lung Sounds in heart and lung sounds signal are separated, obtain cardiechema signals by mode；
(4) by heart sound anomaly analysis algorithm, and existing spectrogram, shannon energy figure and time gate figure are combined, from the above-mentioned heart
First heart sound and second heart sound are extracted in sound signal, then calculates the time difference of adjacent peak in shannon energy figure, are obtained pair
The analysis result of heart sound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910008027.8A CN109793533A (en) | 2019-01-04 | 2019-01-04 | A kind of Simple electronic stethoscope |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910008027.8A CN109793533A (en) | 2019-01-04 | 2019-01-04 | A kind of Simple electronic stethoscope |
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| CN109793533A true CN109793533A (en) | 2019-05-24 |
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| CN201910008027.8A Pending CN109793533A (en) | 2019-01-04 | 2019-01-04 | A kind of Simple electronic stethoscope |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110559012A (en) * | 2019-10-21 | 2019-12-13 | 江苏鹿得医疗电子股份有限公司 | Electronic stethoscope, control method thereof and control method of medical equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110559012A (en) * | 2019-10-21 | 2019-12-13 | 江苏鹿得医疗电子股份有限公司 | Electronic stethoscope, control method thereof and control method of medical equipment |
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