CN109498055A - Heart sound signal acquisition analysis system and signal analysis method - Google Patents
Heart sound signal acquisition analysis system and signal analysis method Download PDFInfo
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- CN109498055A CN109498055A CN201811589512.0A CN201811589512A CN109498055A CN 109498055 A CN109498055 A CN 109498055A CN 201811589512 A CN201811589512 A CN 201811589512A CN 109498055 A CN109498055 A CN 109498055A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B7/00—Instruments for auscultation
- A61B7/02—Stethoscopes
- A61B7/04—Electric stethoscopes
Abstract
The present invention is suitable for the field of medical instrument technology, provide a kind of heart sound signal acquisition analysis system and signal analysis method, including heart sound signal acquisition unit, environmental noise signal acquisition unit, electrocardio signal collecting unit, signal processing unit, signal transmission unit and host computer；Heart sound signal acquisition unit, environmental noise signal acquisition unit and electrocardio signal collecting unit are all connected with signal processing unit, signal processing unit connection signal transmission unit, and signal transmission unit connects host computer.The acquisition to cardiechema signals may be implemented in this system, and to analyzing after the processing of the cardiechema signals of acquisition, system has simple for structure, clear function, the characteristics of capable of effectively extracting and analyze cardiechema signals.
Description
Technical field
The invention belongs to the field of medical instrument technology more particularly to a kind of heart sound signal acquisition analysis systems and signal to analyze
Method.
Background technique
Heart sound is due to the diastole contraction of valvular switch, tendon and muscle, the impact of blood flow and the vibration of painstaking effort tube wall
A kind of dynamic and generation complex tone.It include about heart various pieces such as atrium, ventricle, big blood vessel, angiocarpy and each
A large amount of pathological informations of valvular function state are the most basic parameters of clinical assessment heart function state.When cardiovascular disease still
It does not develop to and was enough to generate clinical and pathological change (such as ECG Change) in the past, the noise and distortion occurred in heart sound is exactly weight
The diagnostic message wanted.Therefore, the important clinical Diagnostic Superiority that heart sound has electrocardio irreplaceable.
In recent years, since computer technology, modern signal processing, pattern-recognition etc. are widely applied, it is based on the heart
The heart disease intelligent diagnosis system research of sound signal becomes foreign study hot spot, and the country has only existed in step in this method
Section, and foreign study person although expand series and in-depth study, but largely use artificial neural network, support vector machines
Equal classifiers carry out single heart disease noise classification, and system structure is complicated.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of heart sound signal acquisition analysis system and signal analysis method, with
Solve the problems, such as that structure is complicated for heart sound acquisition analysis system in the prior art.
In order to solve the above technical problems, the first embodiment of the present invention provides a kind of heart sound signal acquisition analysis system,
Including heart sound signal acquisition unit, environmental noise signal acquisition unit, electrocardio signal collecting unit, signal processing unit, signal
Transmission unit and host computer；
The heart sound signal acquisition unit, the environmental noise signal acquisition unit and the electrocardio signal collecting unit are equal
The signal processing unit is connected, the signal processing unit connects the signal transmission unit, and the signal transmission unit connects
Connect the host computer；
The heart sound signal acquisition unit is for acquiring cardiechema signals, and the environmental noise signal acquisition unit is for acquiring
Environmental noise signal, the electrocardio signal collecting unit receive the heart for acquiring electrocardiosignal, the signal processing unit
Sound signal, the environmental noise signal and the electrocardiosignal, and to the cardiechema signals, the environmental noise signal and described
Electrocardiosignal is handled, described in treated the cardiechema signals, the environmental noise signal and electrocardiosignal process
Signal transmission unit is sent to the host computer, and the host computer is to the cardiechema signals, the environmental noise signal and described
Electrocardiosignal is analyzed.
Further, the signal processing unit includes analog to digital conversion circuit, first processor and several filter circuits,
Several filter circuits are all connected with analog-digital conversion circuit as described, and analog-digital conversion circuit as described connects the first processor, described
First processor connects the signal transmission unit.
Further, each filter circuit include amplifying circuit, 15Hz high-pass filtering circuit, 50Hz notch filter circuit and
2KHz low-pass filter circuit, the input terminal of the amplifying circuit connect the heart sound signal acquisition unit or environmental noise letter
The output end of number acquisition unit or the electrocardio signal collecting unit, the amplifying circuit connects the 15Hz high-pass filtering circuit
Input terminal, the output end of the 15Hz high-pass filtering circuit connects the input terminal of the 50Hz notch filter circuit, described
The output end of 50Hz notch filter circuit connects the input terminal of the 2KHz low-pass filter circuit, the 2KHz low-pass filter circuit
Output end connect analog-digital conversion circuit as described.
Further, it is eight that the signal processing unit, which includes the number of filter circuit,.
Further, the heart sound signal acquisition unit includes several sequentially connected auscultation heads, each auscultation head packet
Shell, clump weight, piezo and signal wire are included, the clump weight is mounted on the top of the enclosure interior, the piezo peace
Mounted in the bottom end of the enclosure interior, being total to for resonance can occur with the piezo between the piezo and the clump weight
Tymapanum, one end of the signal wire connect the piezo, and the side that the other end of the signal wire passes through the shell connects
The signal processing unit.
Further, the weight of the clump weight is not less than ten grams.
Further, the heart sound signal acquisition unit includes three auscultation heads.
Further, the host computer includes second processor and display unit, and the second processor is separately connected institute
State display unit and the signal transmission unit.
The second embodiment of the present invention provides a kind of signal based on heart sound signal acquisition analysis system described above
Analysis method, comprising:
De-noising and pretreatment are carried out to cardiechema signals；
Envelope extraction is carried out to de-noising and pretreated cardiechema signals；
It is smooth that envelope is carried out to the cardiechema signals after envelope extraction；
P wave positioning to electrocardiosignal；
Cardiechema signals figure is positioned and is segmented according to the P wave position location of electrocardiosignal；
Cardiechema signals figure diastole after segmentation is decomposed；
Calculate average instantaneous frequency and standard deviation；
Calculate Sample entropy.
The beneficial effects of adopting the technical scheme are that the present invention designs a kind of heart sound signal acquisition analysis system
System, heart sound signal acquisition unit are used to acquire environmental noise signal for acquiring cardiechema signals, environmental noise signal acquisition unit,
Electrocardio signal collecting unit receives cardiechema signals, environmental noise signal and electrocardio for acquiring electrocardiosignal, signal processing unit
Signal, and cardiechema signals, environmental noise signal and electrocardiosignal are handled, treated cardiechema signals, environmental noise letter
Number and electrocardiosignal be sent to host computer by signal transmission unit, host computer is to cardiechema signals, environmental noise signal and electrocardio
Signal is analyzed.The acquisition to cardiechema signals may be implemented in this system, and analyzes after handling the cardiechema signals of acquisition,
System has simple for structure, clear function, the characteristics of capable of effectively extracting and analyze cardiechema signals.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without any creative labor, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is the functional block diagram of heart sound signal acquisition analysis system provided in an embodiment of the present invention；
Fig. 2 is the circuit diagram of filter circuit provided in an embodiment of the present invention；
Fig. 3 is the circuit diagram of amplifying circuit provided in an embodiment of the present invention；
Fig. 4 is the circuit diagram of 15Hz high-pass filtering circuit provided in an embodiment of the present invention；
Fig. 5 is the circuit diagram of 50Hz notch filter circuit provided in an embodiment of the present invention；
Fig. 6 is the circuit diagram of 2KHz low-pass filter circuit provided in an embodiment of the present invention；
Fig. 7 is the structural schematic diagram of heart sound signal acquisition unit provided in an embodiment of the present invention；
Fig. 8 is the structural schematic diagram of auscultation head provided in an embodiment of the present invention；
Fig. 9 is the functional block diagram for the heart sound signal acquisition analysis system that another embodiment of the present invention provides；
Figure 10 is the flow chart of signal analysis method provided in an embodiment of the present invention.
In figure: 1, shell；2, clump weight；3, piezo；4, signal wire；5, resonator；6, auscultation head；100, amplification electricity
Road；200,15Hz high-pass filtering circuit；300,50Hz notch filter circuit；400,2KHz low-pass filter circuit.
Specific embodiment
In being described below, for illustration and not for limitation, the tool of such as particular system structure, technology etc is proposed
Body details, to understand thoroughly the embodiment of the present invention.However, it will be clear to one skilled in the art that there is no these specific
The present invention also may be implemented in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
The detailed description of road and method, in case unnecessary details interferes description of the invention.
In order to illustrate technical solutions according to the invention, the following is a description of specific embodiments.
As shown in Figure 1, heart sound signal acquisition analysis system includes heart sound signal acquisition unit, environmental noise signal acquisition list
Member, electrocardio signal collecting unit, signal processing unit, signal transmission unit and host computer；Heart sound signal acquisition unit, environment are made an uproar
Sound signal acquisition unit and electrocardio signal collecting unit are all connected with signal processing unit, and the transmission of signal processing unit connection signal is single
Member, signal transmission unit connect host computer；Heart sound signal acquisition unit is for acquiring cardiechema signals, environmental noise signal acquisition list
Member receives heart sound for acquiring electrocardiosignal, signal processing unit for acquiring environmental noise signal, electrocardio signal collecting unit
Signal, environmental noise signal and electrocardiosignal, and cardiechema signals, environmental noise signal and electrocardiosignal are handled, it handles
Cardiechema signals, environmental noise signal and electrocardiosignal afterwards is sent to host computer by signal transmission unit, and host computer is to heart sound
Signal, environmental noise signal and electrocardiosignal are analyzed.
The acquisition to cardiechema signals may be implemented in this system, and analyzes after handling the cardiechema signals of acquisition, system
With simple for structure, clear function, the characteristics of capable of effectively extracting and analyze cardiechema signals.
In one embodiment of the present of invention, signal processing unit include analog to digital conversion circuit, first processor and several
Filter circuit, several filter circuits are all connected with analog to digital conversion circuit, and analog to digital conversion circuit connects first processor, the first processing
Device connection signal transmission unit.
Cardiechema signals, the environmental noise signal acquisition unit environmental noise signal, electrocardio of heart sound signal acquisition unit acquisition
Signal acquisition unit electrocardiosignal passes through different filter circuits respectively, and the signal after processor is again through analog to digital conversion circuit
Digital signal is converted analog signals into, the digital signal after conversion is sent to first processor, and first processor believes number
It number is analyzed, carries out the diagnosis of disease.Using this system, the digital assay to cardiechema signals, medical staff can be realized
The diagnosis that the state of an illness is carried out by data avoids medical staff by experience and carries out the phenomenon that diagnosis causes mistaken diagnosis.
As shown in Fig. 2, each filter circuit include amplifying circuit 100,15Hz high-pass filtering circuit 200,50Hz power frequency fall into
Wave circuit 300 and 2KHz low-pass filter circuit 400, the input terminal connection heart sound signal acquisition unit or environment of amplifying circuit 100
The output end of noise signal acquisition unit or electrocardio signal collecting unit, amplifying circuit 100 connects 15Hz high-pass filtering circuit 200
Input terminal, 15Hz high-pass filtering circuit 200 output end connection 50Hz notch filter circuit 300 input terminal, 50Hz power frequency
The input terminal of the output end connection 2KHz low-pass filter circuit 400 of trap circuit 300, the output of 2KHz low-pass filter circuit 400
End connection analog to digital conversion circuit.
The cardiechema signals of heart sound signal acquisition unit acquisition or the environmental noise letter of environmental noise signal acquisition unit acquisition
Number or electrocardio signal collecting unit acquisition electrocardiosignal be sent in amplifying circuit 100, amplifying circuit 100 puts signal
Greatly, amplified signal enters in 15Hz high-pass filtering circuit 200, is filled into 15Hz signal below, then passes through 50Hz work
The power frequency component of 50Hz in signal is filtered, then through 2KHz low-pass filter circuit 400, will be above 2KHz by frequency trap circuit 300
Signal filtering, finally obtain the signal of 15Hz to 2KHz, realize the accurate extraction to signal.
As shown in figure 3, amplifying circuit 100 includes resistance R1, resistance R2, resistance R4, resistance R10, resistance R17, resistance
R18, resistance R19, capacitor C8, capacitor C5, capacitor C3, capacitor C11, capacitor C16, capacitor C17 and amplification chip, the one of resistance R1
End be separately connected one end of capacitor C8 and one end of heart sound signal acquisition unit or environmental noise signal acquisition unit one end or
One end of electrocardio signal collecting unit, the other end connection+2V power supply of resistance R1, the one of the other end connection resistance R2 of capacitor C8
End, the other end of resistance R2 are separately connected the third pin of one end of capacitor C5, one end of resistance R4 and amplification chip, capacitor C5
The other end be separately connected one end and ground of the other end of resistance R4, one end of capacitor C16, resistance R19, capacitor C16's is another
End is separately connected the other end, one end of resistance R18 and the second pin of amplification chip of resistance R19, and the other end of resistance R18 connects
Connect one end of capacitor C11, the other end of capacitor C11 be separately connected resistance R17 one end and heart sound signal acquisition unit it is another
The other end of the other end or electrocardio signal collecting unit of end or environmental noise signal acquisition unit, another termination of resistance R17
Ground, the 8th pin of one end connection amplification chip of resistance R10, the first pin of the other end connection amplification chip of resistance R10,
One end of capacitor C3 is separately connected the 7th pin and+2V power supply of amplification chip, and the other end of capacitor C3 is grounded, capacitor C17's
One end is separately connected the 4th pin and -2V power supply of amplification chip, and the other end of capacitor C17 is separately connected the 5th of amplification chip
Pin and ground, the input terminal of the 6th pin connection 15Hz high-pass filtering circuit 200 of amplification chip.
In one embodiment of the present of invention, amplification chip INA188ID.
Amplifying circuit 100 can amplify circuit.
As shown in figure 4,15Hz high-pass filtering circuit 200 includes capacitor C13, capacitor C14, capacitor C1, capacitor C21, resistance
R5, resistance R23, resistance R25, resistance R26 and the first filtering chip, the output of one end connection amplifying circuit 100 of capacitor C13
End, the other end of capacitor C13 are separately connected one end of capacitor C14 and one end of resistance R5, and the other end of capacitor C14 is separately connected
The third pin of one end of resistance R23 and the first filtering chip, the other end ground connection of resistance R23, the other end difference of resistance R5
One end of resistance R25 and the first pin of the first filtering chip are connected, the other end of resistance R25 is separately connected the one of resistance R26
The second pin at end and the first filtering chip, the other end ground connection of resistance R26, one end of capacitor C1 is separately connected the first filtering core
The other end of the 8th pin and+2V power supply of piece, capacitor C1 is grounded, and one end of capacitor C21 is separately connected the first filtering chip
The other end of 4th pin and -2V power supply, capacitor C21 is grounded, and the first pin of the first filtering chip connects 50Hz notch filter
The input terminal of circuit 300.
In one embodiment of the present of invention, the first filtering chip is OPA2188AIDGK.
The signal that 15Hz high-pass filtering circuit 200 will be less than 15Hz is filtered.
As shown in figure 5,50Hz notch filter circuit 300 includes resistance R20, resistance R6, resistance R21, resistance R7, resistance
R22, resistance R8, resistance R13, capacitor C6, capacitor C18, capacitor C7, capacitor C15 and the second filtering chip, one end point of resistance R8
Not Lian Jie the output end of 15Hz high-pass filtering circuit 200, one end of capacitor C6 and resistance R20 one end, the other end of capacitor C6
It is separately connected one end of resistance R6 and one end of capacitor C7, the other end of resistance R20 is separately connected one end and the resistance of capacitor C18
One end of R21, the other end of resistance R6 are separately connected the other end of capacitor C18, one end of resistance R22, second filtering chip
6th pin, the second filtering chip the 7th pin and resistance R13 one end, the other end of capacitor C7 is separately connected resistance R21
The other end, one end of resistance R7 and the 5th pin of the second filtering chip, the other end of resistance R7 is separately connected capacitor C15's
The other end of one end and resistance R22, the other end ground connection of capacitor C15, the other end of resistance R13 are separately connected the another of resistance R8
The input terminal at end and 2KHz low-pass filter circuit 400.
In one embodiment of the present of invention, the second filtering chip is OPA2188AIDGK.
The power frequency interference signals of 50Hz are filtered by 50Hz notch filter circuit 300.
As shown in fig. 6,2KHz low-pass filter circuit 400 includes resistance R3, resistance R11, resistance R12, resistance R24, resistance
R15, resistance R9, resistance R16, resistance R14, capacitor C4, capacitor C9, capacitor C2, capacitor C12, capacitor C19, capacitor C20, capacitor
C10 and third filtering chip, the output end of one end connection 50Hz notch filter circuit 300 of resistance R14, resistance R14's is another
End is separately connected one end of one end of resistance R15, one end of resistance R24 and capacitor C9, and the other end of capacitor C9 is separately connected electricity
Hinder one end, one end of resistance R12 and one end of resistance R3 of R11, the other end ground connection of resistance R11, the other end point of resistance R3
Not Lian Jie one end of capacitor C4, one end of capacitor C10, one end of resistance R9 and analog to digital conversion circuit first input end, capacitor
The other end of C4 is separately connected the other end of resistance R12 and the 8th pin of third filtering chip, one end connection of capacitor C12 the
7th pin of three filtering chips, the other end ground connection of capacitor C12, the second pin ground connection of third filtering chip, resistance R15's
The other end is separately connected one end of capacitor C19 and the first pin of third filtering chip, and the other end of resistance R24 is separately connected electricity
Hold the other end of C19, the other end of capacitor C10, one end of resistance R16 and the second input terminal of analog to digital conversion circuit, resistance R9
The other end connection third filtering chip the 5th pin, resistance R16 the other end connection third filtering chip the 4th pin,
One end of capacitor C20 is separately connected the 6th pin and -2V power supply of third filtering chip, and the other end of capacitor C20 is grounded, capacitor
One end of C2 is separately connected the third pin and+2V power supply of third filtering chip, and the other end of capacitor C2 is grounded.
In one embodiment of the present of invention, third filtering chip is LTC6363IMS8#PBF.
The signal that 2KHz low-pass filter circuit 400 will be above 2KHz is filtered, and finally obtains the signal of 15Hz to 2KHz.
In one embodiment of the present of invention, signal processing unit includes that the number of filter circuit is eight.This design can
It realizes six road heart sound signal acquisition units, all the way environmental noise signal acquisition unit and all the way electrocardio signal collecting unit while adopting
Collection, acquisition data are more, improve the accuracy of diagnosis.
As shown in Figure 7 and Figure 8, heart sound signal acquisition unit includes several sequentially connected auscultation heads 6, each auscultation head
6 include shell 1, clump weight 2, piezo 3 and signal wire 4, and clump weight 2 is mounted on the top inside shell 1, and piezo 3 is installed
Bottom end inside shell 1 is the resonator 5 that resonance can occur with piezo 3, signal wire 4 between piezo 3 and clump weight 2
One end connect piezo 3, the other end of signal wire 4 passes through the side connection signal processing unit of shell 1.
When being acquired to human heart sound signal, auscultation head 6 is placed on the designated position of human body, due to setting for clump weight 2
It sets, auscultation head 6 and human body can be made to be in close contact, human body heart sound passes in piezo 3 and is converted into electric signal, due to resonator
5 can with buzzer occur resonance, achieve the effect that increase acoustic pressure, the electric signal being converted into be sent to signal processing unit into
Row signal processing completes the acquisition of human heart sound signal.When being acquired using auscultation head 6 to human heart sound signal, it can capture
Faint cardiechema signals can increase the acoustic pressure under specific frequency by adjusting piezo 3 and resonator 5 and obtain specific band
Width can precisely obtain cardiechema signals, and by cardiechema signals display in wave shape, medical staff is examined by observing heart sound waveform
It is disconnected, it solves to listen to the phenomenon that heart sound causes mistaken diagnosis by ear due to medical staff.
In one embodiment of the present of invention, the weight of clump weight 2 is not less than ten grams.This design can guarantee 2 energy of clump weight
It enough plays and increases the whole quality of auscultation head 6, when guaranteeing that auscultation head 6 is placed on human body, auscultation head 6 can closely connect with human body
Touching, guarantees the good acquisition to human heart sound signal.
In one embodiment of the present of invention, heart sound signal acquisition unit includes three auscultation heads 6.
Human heart volume is little, and each heart sound signal acquisition unit includes three auscultation heads 6, is carrying out human body heart sound letter
Number acquisition when, the two sides of heart are individually positioned in using two heart sound signal acquisition units, heart can be surrounded completely, realize
Acquisition to cardiechema signals.The auscultation head 6 of different numbers can be set as needed simultaneously, such as be set as two or four.
In one embodiment of the present of invention, piezo 3 is piezoelectric ceramics piezo.Piezoelectric ceramics piezo includes one piece two
Face is printed with the piezoelectric ceramic plate and one piece of metal plate of electrode, and using adhesive, piezoelectric ceramic plate and metal plate bond together,
Heart sound sound wave, which passes to pack of ceramic piezoelectric plates, makes pack of ceramic piezoelectric plates generation electric signal be sent to signal processing unit progress signal processing.
Cardiechema signals band bandwidth can be obtained by the size of piezoelectricity singing piece 3 and resonator 5, i.e., is filtered from structure
Wave.Principle: piezo 3 is mounted in resonator Room 5, to generate high sound pressure.Utilize formula (helmholtz formula), Ke Yiji
Calculate the resonance frequency (f of resonator Room 5cav).Since piezo 3 and resonator Room 5 have resonance frequency appropriate, respectively
(f0) and (fcav), therefore, the acoustic pressure under specific frequency can be increased by the position of both control and obtain specific band
It is wide.
In one embodiment of the present of invention, the diameter of piezo 3 is 27 millimeters, and resonance frequency is two kHz.
Usual resonance frequency is lower, and the diameter of piezo 3 is bigger, and thickness is thinner, but due to the cardiac size of human body
Limitation, is detected using a group probe, so the diameter of buzzer cannot be too big, two aspect of synthetical resonance frequency and diameter
Factor, selecting diameter is 27 millimeters, and resonance frequency is the model of two kHz.
As shown in figure 9, host computer includes second processor and display unit, second processor be separately connected display unit and
Signal transmission unit.
Second processor receives treated cardiechema signals, environmental noise signal and electrocardio by signal transmission unit and believes
Number, then three signals are further processed, three kinds of signals are shown with waveform, medical staff according to the waveform of display into
Row diagnosis, improves the accuracy of diagnosis.
As shown in Figure 10, the signal analysis method based on heart sound signal acquisition analysis system, comprising:
Step S901 carries out de-noising and pretreatment to cardiechema signals；Using wavelet threshold denoising, high frequency noise is removed.
Step S902 carries out envelope extraction to de-noising and pretreated cardiechema signals；It is converted using Hilbert and extracts packet
Line.
It is smooth to carry out envelope to the cardiechema signals after envelope extraction by step S903；Abrupt local value is removed using averaging method.
Step S904 positions the P wave of electrocardiosignal；By electrocardiac channel data, given threshold and use window, positioning
P wave crest location.
Step S905 is positioned and is segmented to cardiechema signals figure according to the P wave position location of electrocardiosignal；Pass through P wave wave crest
Position positions S1 initial position, delays 120ms positioning S1 end position.In the initial position of adjacent S1 end position and S1,
Maximizing, rising to position using the position as S2.
Step S906 decomposes the cardiechema signals figure diastole after segmentation；Diastole signal data is decomposed using EEMD.
Step S907 calculates average instantaneous frequency and standard deviation；Instantaneous frequency is calculated to each layer after decomposition, is then calculated
Average instantaneous frequency and standard deviation.
Step S908 calculates Sample entropy；The low frequency part removed after EEMD is decomposed in layer is (low with original sample related coefficient
Part), reduce influence of this part to Sample Entropy calculated result.
By the method, the accurate analysis to cardiechema signals can be realized, due to the main accuracy for improving diagnosis.
Embodiment described above is merely illustrative of the technical solution of the present invention, rather than its limitations；Although referring to aforementioned reality
Applying example, invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution should all
It is included within protection scope of the present invention.
Claims (9)
1. a kind of heart sound signal acquisition analysis system, which is characterized in that adopted including heart sound signal acquisition unit, environmental noise signal
Collect unit, electrocardio signal collecting unit, signal processing unit, signal transmission unit and host computer；
The heart sound signal acquisition unit, the environmental noise signal acquisition unit and the electrocardio signal collecting unit are all connected with
The signal processing unit, the signal processing unit connect the signal transmission unit, and the signal transmission unit connects institute
State host computer；
The heart sound signal acquisition unit is for acquiring cardiechema signals, and the environmental noise signal acquisition unit is for acquiring environment
Noise signal, the electrocardio signal collecting unit receive the heart sound letter for acquiring electrocardiosignal, the signal processing unit
Number, the environmental noise signal and the electrocardiosignal, and to the cardiechema signals, the environmental noise signal and the electrocardio
Signal is handled, and treated, and the cardiechema signals, the environmental noise signal and the electrocardiosignal pass through the signal
Transmission unit is sent to the host computer, and the host computer is to the cardiechema signals, the environmental noise signal and the electrocardio
Signal is analyzed.
2. heart sound signal acquisition analysis system according to claim 1, which is characterized in that the signal processing unit includes
Analog to digital conversion circuit, first processor and several filter circuits, several filter circuits are all connected with analog-digital conversion circuit as described,
Analog-digital conversion circuit as described connects the first processor, and the first processor connects the signal transmission unit.
3. heart sound signal acquisition analysis system according to claim 2, which is characterized in that each filter circuit includes amplification
Circuit, 15Hz high-pass filtering circuit, 50Hz notch filter circuit and 2KHz low-pass filter circuit, the input terminal of the amplifying circuit
The heart sound signal acquisition unit or the environmental noise signal acquisition unit or the electrocardio signal collecting unit are connected, it is described
The output end of amplifying circuit connects the input terminal of the 15Hz high-pass filtering circuit, the output end of the 15Hz high-pass filtering circuit
The input terminal of the 50Hz notch filter circuit is connected, the output end of the 50Hz notch filter circuit connects the 2KHz low pass
The output end of the input terminal of filter circuit, the 2KHz low-pass filter circuit connects analog-digital conversion circuit as described.
4. heart sound signal acquisition analysis system according to claim 2, which is characterized in that the signal processing unit includes
The number of filter circuit is eight.
5. heart sound signal acquisition analysis system according to claim 1, which is characterized in that the heart sound signal acquisition unit
Including several sequentially connected auscultation heads, each auscultation head includes shell, clump weight, piezo and signal wire, the counterweight
Block is mounted on the top of the enclosure interior, and the piezo is mounted on the bottom end of the enclosure interior, the piezo and institute
It states for the piezo can be connected with the resonator of piezo generation resonance, one end of the signal wire between clump weight,
The side that the other end of the signal wire passes through the shell connects the signal processing unit.
6. heart sound signal acquisition analysis system according to claim 5, which is characterized in that the weight of the clump weight is not small
Yu Shike.
7. heart sound signal acquisition analysis system according to claim 5, which is characterized in that the heart sound signal acquisition unit
Including three auscultation heads.
8. heart sound signal acquisition analysis system according to claim 1, which is characterized in that the host computer includes at second
Reason device and display unit, the second processor are separately connected the display unit and the signal transmission unit.
9. a kind of signal analysis method based on the described in any item heart sound signal acquisition analysis systems of claim 1 to 8, special
Sign is, comprising:
De-noising and pretreatment are carried out to cardiechema signals；
Envelope extraction is carried out to de-noising and pretreated cardiechema signals；
It is smooth that envelope is carried out to the cardiechema signals after envelope extraction；
P wave positioning to electrocardiosignal；
Cardiechema signals figure is positioned and is segmented according to the P wave position location of electrocardiosignal；
Cardiechema signals figure diastole after segmentation is decomposed；
Calculate average instantaneous frequency and standard deviation；
Calculate Sample entropy.
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| Publication number | Priority date | Publication date | Assignee | Title |
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