CN105078435A - Fetal heart sound signal detection and processing device - Google Patents
Fetal heart sound signal detection and processing device Download PDFInfo
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Abstract
The invention provides a fetal heart sound signal detection and processing device. The fetal heart sound signal detection and processing device comprises a signal detection unit and a signal processing unit. The signal detection unit is used for collecting fetal heart sound acoustic signals and converting the fetal heart sound acoustic signals into fetal heart sound electric signals. The signal processing unit comprises a processing subunit, a feature identification subunit and a calculation subunit. The processing subunit is used for carrying out denoising processing on the fetal heart sound electric signals and extracting signal envelopes of the fetal heart sound electric signals undergoing denoising processing. The feature identification subunit is used for identifying positions of first heart sound waveforms and positions of second heart sound waveforms in the signal envelops. The calculation subunit is used for calculating duration between starting points or finishing points of every two adjacent first heart sound waveforms and of every two adjacent second heart sound waveforms, so that multiple heart rate values based on first heart sounds and multiple heart rate values based on second heart sounds are obtained, and the heart rate values are averaged so that the fetal heart rate can be obtained. According to the fetal heart sound signal detection and processing device, fetuses cannot be influenced when fetal heart sound signals are collected, and the collected fetal heart sound signals can be well processed.
Description
Technical field
The present invention relates to bio-signal acquisition technical field, be specifically related to a kind of fetal heart sound signal detection and treatment device.
Background technology
According to WHO, the world about has more than 300 ten thousand fetuses dead at gestation every year, dead in about more than 400 ten thousand babies surrounding after birth, if anemia of pregnant woman is at phenolics, foetus health situation can be checked on time, and obtain corresponding gestation, childbirth and postpartum care guidance, the mortality rate of fetus and baby will be greatly reduced.Generally, anemia of pregnant woman just starts hospital after 24 weeks and periodically accepts foetus health monitoring becoming pregnant, foetus health monitoring can detect that the heart disease of some fetus, fetus are by abnormal conditions such as suffocating of causing of cord entanglement and fetal distresss in advance, thus realize eugenic, with foetus health, safety precautions, can greatly reduce prenatal foetal and puerperal baby mortality rate.And, the health of fetus and the health of anemia of pregnant woman, nutrition and psychologic status closely bound up, therefore, when significant change appears in the health of fetus, doctor not only can consider the disease that fetus may suffer from, and also can consider the situation of anemia of pregnant woman itself, then overall merit, draw diagnostic recommendations, realize pregnant woman health, safely pregnancy, produce smoothly.
Heart of fetus is the same with human adult heart, comprises two ventricles, two atrium and four kinds of valves.In a cardiac cycle, heart occurs once to shrink and diastole, and namely a cardiac cycle comprises atrial systole, auricular diastole, ventricular systole and ventricular diastole Four processes.Before heart of fetus starts cardiac cycle, blood flows to atrium accumulation through vein and Placenta Hominis, then beats as human adult heart, in heart blood circulation, atrium starts to shrink, valve is opened, and blood flows into ventricle by atrium, thus the cardiac cycle that formation one is complete.In the process of each cardiac cycle, by the idiomuscular diastole of the heart, the closedown of valve and blood flow impact the sound produced and are called fetal heart sound.Fetal heart sound is just as the ticktack sound of mechanical watch, there is certain rule, each cardiac cycle can produce four fetal heart sounds, comprises first heart sound (S1), second heart sound (S2), third heart sound (S3) and fourth heart sound (S4).Wherein, first heart sound (S1) appears at Ventricular systole, and mark ventricle starts to shrink, the ventricle wall vibration formation of closing primarily of atrioventricular valves (A V valves) and accompanying, and its tone is lower, and the persistent period is longer; Second heart sound (S2) appears at ventricular diastole, and after namely appearing at first heart sound (s1), mark ventricle starts diastole, and primarily of formation such as arterial valve closedowns, its tone is higher, and the persistent period is shorter; It is early stage that third heart sound (S3) appears at ventricular diastole, and along with the opening of atrioventricular valves (A V valves), the blood in atrium flows rapidly into ventricle, causes the vibration of ventricle wall and chordae tendineae, thus form third heart sound, and its tone is lower, continues shorter; Fourth heart sound (S4) is by atrial systole, and blood flow fills the vibration caused by ventricle fast and formed, and also known as atrial heart sound, its tone is lower, continues shorter.For these four kinds of fetal heart sounds, first heart sound (S1) and second heart sound (S2) can only be heard, and third heart sound (S3) and fourth heart sound (S4) are due to too faint, are generally difficult to hear.
In foetus health monitoring (also referred to as fetal heart monitoring) technology, fetal heart sound figure (fetalphonocadiogram is called for short FPCG) monitoring is one of relatively easy technology realized.Be specially, gather fetal heart sound signal at her abdominal, and be depicted as fetal heart sound oscillogram, the much information such as Fetal Heart Rate, fetal movement can be obtained by this figure, and these information can be good at the health status of reacting fetus.
At present, do fetal heart monitoring at her abdominal and generally adopt ultrasonic doppler mode, which launches a certain amount of ultrasonication in heart of fetus by ultrasonic probe, can to ultrasonic generation reflection when heart of fetus is beaten, probe receives be reflected back ultrasonic and ultrasonicly does corresponding analysis to what receive, just can obtain the action message (as fetal heart sound) of heart of fetus, this mode possesses skills maturation, realize the advantages such as convenient, but, owing to needing to use ultrasonic coupling agent during using ultrasound, and when ultrasonication is in fetus, fetus can be stimulated, make its movable aggravation, these all can cause the error of testing result, in addition, fetal heart monitoring also can adopt stethoscopic mode, highly sensitive stethoscope is such as used to listen fetal heart sound in her abdominal appropriate position, this method is passive detection fetal heart sound, any impact can not be produced to fetus, but, because fetal heart sound is a kind of faint low frequency non-linear, non-stationary physiological signal, primary band is in 20-200Hz, common stethoscope is inapplicable, and highly sensitive stethoscope is too expensive again, and, adopt stethoscopic mode to find fetal rhythm location comparison difficulty, be difficult to popularize.Simultaneously, fetal heart sound is when outwards propagating by the her abdominal tissue such as amniotic fluid, uterus and organ, outside noise can be subject to, fetal movement, the hear sounds of anemia of pregnant woman, the interference of her abdominal blood flow sound, borborygmus etc., makes the fetal heart sound signal that collects at her abdominal very complicated, and existing ultrasonic doppler mode and stethoscope mode fairly simple to the processing method comprising the fetal heart sound signal of noise collected, the error of result is larger.
Therefore, how can not fetus can be had an impact when gathering fetal heart sound signal, and acquisition method is simple, cheap, well can process again to the fetal heart sound signal collected, reduce the error of result, become problem demanding prompt solution in industry.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned defect existing in prior art, thering is provided one both can not have an impact to fetus when gathering fetal heart sound signal, the fetal heart sound signal detection and treatment device of good process can be carried out again the fetal heart sound signal collected.
Solve the technical scheme that the technology of the present invention problem adopts:
Described fetal heart sound signal detection and treatment device comprises detecting signal unit and signal processing unit, and described signal processing unit comprises process subelement, feature identification subelement and computation subunit,
Described detecting signal unit is connected with the process subelement in signal processing unit, for gathering fetal heart sound acoustical signal from her abdominal, is sent to process subelement after converting described fetal heart sound acoustical signal to the fetal heart sound signal of telecommunication;
Described process subelement is also connected with feature identification subelement, for carrying out except process of making an uproar to the described fetal heart sound signal of telecommunication, extracting the signal envelope of the fetal heart sound signal of telecommunication after except process of making an uproar, and described signal envelope is sent to feature identification subelement;
Described feature identification subelement is also connected with computation subunit, for the position of the position He each second heart sound waveform of identifying each first heart sound waveform in described signal envelope respectively, and is sent to computation subunit;
Described computation subunit is used for according to the position of each first heart sound waveform in described signal envelope and the position of each second heart sound waveform, duration between the starting point/end point calculating often adjacent two first heart sound waveforms respectively, duration between the starting point/end point of every adjacent two second heart sound waveforms, obtain multiple heart rate value based on first heart sound and multiple heart rate value based on second heart sound, be averaging to draw Fetal Heart Rate to described multiple heart rate value based on first heart sound and multiple heart rate value based on second heart sound.
Preferably, described detecting signal unit comprises the coupling operatic tunes and acoustic-electric conversion subelement,
One end of the described coupling operatic tunes contacts with her abdominal, and the other end and acoustic-electric are changed subelement and be connected, for gathering fetal heart sound acoustical signal and sending acoustic-electric conversion subelement to;
Described acoustic-electric conversion subelement is connected with the process subelement in signal processing unit, after converting described fetal heart sound acoustical signal to the fetal heart sound signal of telecommunication, be sent to process subelement.
Preferably, described detecting signal unit also comprises preamplifier and frequency overlapped-resistable filter,
Described preamplifier is changed subelement with acoustic-electric respectively and is connected with frequency overlapped-resistable filter, carries out processing and amplifying, and the fetal heart sound signal of telecommunication after processing and amplifying is sent to frequency overlapped-resistable filter for the fetal heart sound signal of telecommunication exported acoustic-electric conversion subelement;
Described frequency overlapped-resistable filter is connected with the process subelement in signal processing unit with preamplifier respectively, for the high-frequency noise in the fetal heart sound signal of telecommunication after the processing and amplifying that filtering preamplifier exports, and the fetal heart sound signal of telecommunication after filter away high frequency noise is sent to process subelement.
Preferably, described signal processing unit also comprises display subelement,
Described display subelement is connected with computation subunit, for showing the Fetal Heart Rate that computation subunit exports.
Preferably, described signal processing unit also comprises coded sub-units and plays subelement, described coded sub-units respectively with process subelement with play subelement and be connected,
Described process subelement is also for being sent to coded sub-units by except the fetal heart sound signal of telecommunication after process of making an uproar;
Described coded sub-units is used for becoming audio file by except the fetal heart sound signal of telecommunication after process of making an uproar by digital coding, and described audio file is sent to broadcasting subelement;
Described broadcasting subelement is for playing described audio file.
Preferably, described signal processing unit also comprises storing sub-units,
Described storing sub-units is connected with coded sub-units and/or computation subunit, for the audio file that memory encoding subelement exports, and/or, the Fetal Heart Rate that computation subunit exports.
Preferably, described signal processing unit also comprises mutual subelement,
Described mutual subelement is connected with coded sub-units and/or computation subunit respectively, and for the audio file exported by coded sub-units, and/or the Fetal Heart Rate that computation subunit exports is sent to miscellaneous equipment.
Preferably, the signal transmission form between described mutual subelement and miscellaneous equipment is: any one in NFC transmission means, ZigBee transmission means, Wi-Fi transmission means, Bluetooth transmission mode, the ZigBee transmission means being guided pairing by NFC, the Wi-Fi transmission means being guided pairing by NFC, the Bluetooth transmission mode being guided pairing by NFC, USB transmission means and mail transmission mode.
Preferably, described feature identification subelement comprises coarse positioning module, thin locating module and searches module,
Described coarse positioning module is connected with thin locating module with process subelement respectively, described process subelement is used for the coarse positioning module be sent to by described signal envelope in feature identification subelement, described coarse positioning module is for obtaining first threshold T1, with the point found out all amplitudes and be greater than first threshold T1 to (N1-N) individual point for the N number of o'clock at described signal envelope, and preserve its positional information, to form coarse positioning signal, and described coarse positioning signal is sent to thin locating module, wherein
T1＝0.25*MAX1(1)
In formula (1), MAX1 be the N number of o'clock of described signal envelope to the amplitude maximum point in (N1-N) individual point, N1 is the length of described signal envelope, N=fs* (t1+t2), fs is sample frequency, t1 is the time limit of first heart sound, and t2 is the time limit of second heart sound;
Described thin locating module also with search module and be connected, described thin locating module is for obtaining Second Threshold T2, with the point found out all amplitudes and be greater than Second Threshold T2 to (N2-N) individual point for the N number of o'clock at described coarse positioning signal, and preserve its positional information, to form thin framing signal, and described thin framing signal is sent to searches module, wherein
T2＝0.05*MAX2(2)
In formula (2), MAX2 be the N number of o'clock of described coarse positioning signal to the amplitude maximum point in (N2-N) individual point, N2 is the length of coarse positioning signal, N=fs* (t1+t2), fs is sample frequency, t1 is the time limit of first heart sound, and t2 is the time limit of second heart sound;
Described searching in module is preset with the first step-length L1 and the second step-length L2, wherein,
L1＝fs*t1(3)
L2＝fs*t2(4)
In formula (3) and formula (4), fs is sample frequency, and t1 is the time limit of first heart sound, and t2 is the time limit of second heart sound;
Described module of searching also is connected with computation subunit, the waveform that all starting points to the duration of terminating point meets the first step-length L1 is searched backward successively for the top from described thin framing signal, and the waveform that all starting points to the duration of terminating point meets the second step-length L2 is searched backward successively from the top of described thin framing signal, with the position of the position He each second heart sound waveform of identifying each first heart sound waveform respectively, and be sent to computation subunit.
Preferably, described feature identification subelement also comprises screening module, described screening module respectively with search module and be connected with computation subunit, for screening the position of the position and each second heart sound waveform of searching each first heart sound waveform that Module recognition goes out, retain and allly meet the fetus Ventricular systole time in corresponding cardiac cycle and be less than the position of the first heart sound waveform of relaxing period time conditions and the position of second heart sound waveform, the described systole time be first heart sound waveform starting point and and its starting point being in the second heart sound waveform of same cardiac cycle between duration, the described relaxing period time be described second heart sound waveform starting point and be in next cardiac cycle adjacent first heart sound waveform starting point between duration.
Beneficial effect:
Fetal heart sound signal detection and treatment device of the present invention directly can gather fetal heart sound acoustical signal from her abdominal on the one hand, can't have an impact, thus can reduce the error of testing result to fetus; The fetal heart sound acoustical signal collected well can be processed again on the other hand, namely, convert fetal heart sound acoustical signal to the fetal heart sound signal of telecommunication, and carry out except process of making an uproar to it, obtain the clean fetal heart sound signal of telecommunication, then extract the signal envelope of the fetal heart sound signal of telecommunication after except process of making an uproar and carry out analyzing and calculate, thus drawing Fetal Heart Rate, this has important value and significance to foetus health monitoring.Meanwhile, the Fetal Heart Rate drawn can be shown; Also the laggard row of audio file can be become to play through digital coding by except the fetal heart sound signal of telecommunication after process of making an uproar; Also the audio file that the Fetal Heart Rate drawn and coding are formed can be shared by wired or wireless mode and miscellaneous equipment, realize the many monitoring of equipments to Fetal Heart Rate, be more conducive to carrying out real-time monitoring to fetus.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of fetal heart sound signal detection and treatment device described in the embodiment of the present invention 1;
Fig. 2 is the structured flowchart of fetal heart sound signal detection and treatment device described in the embodiment of the present invention 2;
Fig. 3 is the structural representation of the coupling operatic tunes in Fig. 2 and acoustic-electric conversion subelement;
Fig. 4 is through the analogous diagram except the fetal heart sound signal after process of making an uproar in the embodiment of the present invention 2;
Fig. 5, Fig. 6 analogous diagram of signal envelope for drawing after carrying out envelope extraction to fetal heart sound signal shown in Fig. 4.
In figure: 1-is coupled the operatic tunes; 2-acoustic-electric conversion subelement; 3-packing ring; S1-first heart sound; S2-second heart sound; The time limit of t1-first heart sound; The time limit of t2-second heart sound; The ts-fetus Ventricular systole time; The td-fetus ventricular diastole time; T-cardiac cycle.
Detailed description of the invention
For making those skilled in the art understand technical scheme of the present invention better, below in conjunction with drawings and Examples, the present invention is described in further detail.
Embodiment 1:
As shown in Figure 1, the present embodiment provides a kind of fetal heart sound signal detection and treatment device, comprises detecting signal unit and signal processing unit, and wherein, described signal processing unit comprises process subelement, feature identification subelement and computation subunit.It should be noted that, because fetal heart sound itself is a kind of acoustical signal, therefore " fetal heart sound signal " that occur in the present invention is actual, and what refer to is all " fetal heart sound acoustical signal ".
Described detecting signal unit is connected with the process subelement in signal processing unit, for gathering fetal heart sound acoustical signal from her abdominal, is sent to process subelement after converting described fetal heart sound acoustical signal to the fetal heart sound signal of telecommunication.Different from the ultrasonic doppler mode adopted at present, detecting signal unit described in the present embodiment is not obtain fetal heart sound acoustical signal by launching ultrasonic mode to fetus, but directly gather fetal heart sound acoustical signal from her abdominal, can't have an impact to fetus, thus the error of testing result can be reduced; Described detecting signal unit can adopt the equipment such as existing digital microphone.
Described process subelement is also connected with feature identification subelement, for carrying out except process of making an uproar to the described fetal heart sound signal of telecommunication, extracting the signal envelope of the fetal heart sound signal of telecommunication after except process of making an uproar, and described signal envelope is sent to feature identification subelement.Described process subelement can adopt existing special signal processing single chip, such as STM32, msp430 or ARM etc., extracts the signal envelope of the fetal heart sound signal of telecommunication after except process of making an uproar by the envelope detector in single-chip microcomputer.
Described feature identification subelement is also connected with computation subunit, for the position of the position He each second heart sound waveform of identifying each first heart sound waveform in described signal envelope respectively, thus the pseudo-peak of cancelling noise, obtain the exact position of first heart sound waveform and second heart sound waveform, and be sent to computation subunit.
Described computation subunit is used for according to the position of each first heart sound waveform in described signal envelope and the position of each second heart sound waveform, duration between the starting point/end point calculating often adjacent two first heart sound waveforms respectively, duration between the starting point/end point of every adjacent two second heart sound waveforms, obtain multiple heart rate value based on first heart sound and multiple heart rate value based on second heart sound
Particularly, based on the heart rate value FHR1 of first heart sound
i, i+1=60/t1
i, i+1, i gets the positive integer being more than or equal to 1 successively, t1
i, i+1for adjacent two first heart sound waveforms (i.e. i-th first heart sound waveform and (i+1) individual first heart sound waveform) starting point/end point between duration, unit is second; Based on the heart rate value FHR2 of second heart sound
i, i+1=60/t2
i, i+1, i gets the positive integer being more than or equal to 1 successively, t2
i, i+1for adjacent two second heart sound waveforms (i.e. i-th second heart sound waveform and (i+1) individual second heart sound waveform) starting point/end point between duration, unit is second;
To described multiple heart rate value FHR1 based on first heart sound
i, i+1with multiple heart rate value FHR2 based on second heart sound
i, i+1be averaging to draw Fetal Heart Rate FHR, i.e. the number of times of fetal heartbeat in a minute.
Visible, fetal heart sound signal detection and treatment device described in the present embodiment well can process the fetal heart sound acoustical signal collected, and draws Fetal Heart Rate.
It should be noted that, described in the present embodiment, detecting signal unit, process subelement, feature identification subelement and computation subunit all can adopt existing integrated circuit modules to realize, therefore not be described and restriction its concrete structure.
Embodiment 2:
As shown in Figure 2, the present embodiment provides a kind of fetal heart sound signal detection and treatment device, comprises detecting signal unit and signal processing unit.
Described detecting signal unit comprises the coupling operatic tunes, acoustic-electric conversion subelement, frequency overlapped-resistable filter and preamplifier, and wherein, frequency overlapped-resistable filter and preamplifier are Alternative devices;
Described signal processing unit comprises process subelement, feature identification subelement, computation subunit, display subelement, coded sub-units, broadcasting subelement, storing sub-units and mutual subelement, wherein, showing subelement, coded sub-units, broadcasting subelement, storing sub-units and mutual subelement is Alternative devices.
Particularly, in detecting signal unit, as shown in Figure 3, one end of the described coupling operatic tunes 1 is contacted with her abdominal by packing ring 3, and the other end and acoustic-electric are changed subelement 2 and be connected, for gathering fetal heart sound acoustical signal and sending acoustic-electric conversion subelement 2 to; The described coupling operatic tunes 1 can adopt the existing general coupling operatic tunes;
Described acoustic-electric conversion subelement is also connected with preamplifier, after converting described fetal heart sound acoustical signal to the fetal heart sound signal of telecommunication, be sent to preamplifier;
Described preamplifier is also connected with frequency overlapped-resistable filter, carries out processing and amplifying, and the fetal heart sound signal of telecommunication after processing and amplifying is sent to frequency overlapped-resistable filter for the fetal heart sound signal of telecommunication exported acoustic-electric conversion subelement;
Described frequency overlapped-resistable filter is also connected with the process subelement in signal processing unit, for the high-frequency noise in the fetal heart sound signal of telecommunication after the processing and amplifying that filtering preamplifier exports, and the fetal heart sound signal of telecommunication after filter away high frequency noise is sent to process subelement.
Described process subelement is also connected with coded sub-units with feature identification subelement respectively, again carry out except process of making an uproar for the fetal heart sound signal of telecommunication after the filter away high frequency noise that exports frequency overlapped-resistable filter, obtain the fetal heart sound signal of telecommunication after except process of making an uproar, described except making an uproar the fetal heart sound signal of telecommunication after processing as shown in Figure 4, then the described signal envelope except the fetal heart sound signal of telecommunication after process of making an uproar is extracted, described signal envelope is as Fig. 5, shown in 6, the figure of the signal envelope in Fig. 5 with Fig. 6 is identical, difference is only, the unit of the time shaft of Fig. 5 is second, the unit of the time shaft of Fig. 6 is a little, also be, by the unit of time shaft by being converted into second a little, the benefit done like this is, be conducive to the identification of subsequent characteristics recognin unit to the position of the position of each first heart sound waveform and each second heart sound waveform, described process subelement also by described except make an uproar process after the fetal heart sound signal of telecommunication be sent to coded sub-units, and described signal envelope is sent to feature identification subelement, described process subelement can adopt the special signal processing single chip such as STM32, msp430 or ARM, wherein containing envelope detector, in order to extract the signal envelope of the fetal heart sound signal of telecommunication after except process of making an uproar,
Described feature identification subelement is also connected with computation subunit, for the position of the position He each second heart sound waveform of identifying each first heart sound waveform in described signal envelope respectively, and is sent to computation subunit;
In the present embodiment, described feature identification subelement comprises coarse positioning module, thin locating module and searches module,
Described coarse positioning module is connected with thin locating module with process subelement respectively, described process subelement is used for the coarse positioning module be sent to by signal envelope shown in Fig. 6 in feature identification subelement, described coarse positioning module is for obtaining first threshold T1, with the point found out all amplitudes and be greater than first threshold T1 to (N1-N) individual point for the N number of o'clock at described signal envelope, and preserve its positional information, to form coarse positioning signal, thus eliminate the pseudo-peak of the noise that may exist, and described coarse positioning signal is sent to thin locating module, wherein
T1＝0.25*MAX1(1)
In formula (1), MAX1 be the N number of o'clock of described signal envelope to the amplitude maximum point in (N1-N) individual point, N1 is the length of described signal envelope, N=fs* (t1+t2), fs is sample frequency, t1 is the time limit of first heart sound, and t2 is the time limit of second heart sound, generally, t1=0.085s, t2=0.058s, and the value of t1 and t2 all belongs to common practise, fs can determine according to actual samples situation, generally, fs=2kHz, then N approximates 200, gets N=200 in the present embodiment;
Described thin locating module also with search module and be connected, described thin locating module is for obtaining Second Threshold T2, with the point found out all amplitudes and be greater than Second Threshold T2 to (N2-N) individual point for the N number of o'clock at described coarse positioning signal, and preserve its positional information, to form thin framing signal, thus substantially determine the position of each first heart sound waveform and the position of each second heart sound waveform, and described thin framing signal is sent to searches module, wherein
T2＝0.05*MAX2(2)
In formula (2), MAX2 be the N number of o'clock of described coarse positioning signal to the amplitude maximum point in (N2-N) individual point, N2 is the length of coarse positioning signal, gets N=200;
Described searching in module is preset with the first step-length L1 and the second step-length L2, wherein,
L1＝fs*t1(3)
L2＝fs*t2(4)
In formula (3) and formula (4), get fs=2kHz, t1=0.085s, t2=0.058s;
Described module of searching also is connected with computation subunit, the waveform that all starting points to the duration of terminating point meets the first step-length L1 is searched backward successively for the top from described thin framing signal, and the waveform that all starting points to the duration of terminating point meets the second step-length L2 is searched backward successively from the top of described thin framing signal, with the position of the position He each second heart sound waveform of identifying each first heart sound waveform respectively, thus finally determine the position of each first heart sound waveform and the position of each second heart sound waveform, and be sent to computation subunit;
Preferably, in order to improve the accuracy rate of searching the position of Module recognition first heart sound waveform and the position of second heart sound waveform in feature identification subelement, described feature identification subelement also comprises screening module, described screening module respectively with search module and be connected with computation subunit, for screening the position of the position and each second heart sound waveform of searching each first heart sound waveform that Module recognition goes out, retain and allly meet fetus Ventricular systole time ts in corresponding cardiac cycle T and be less than the position of the first heart sound waveform of relaxing period time td condition and the position of second heart sound waveform, thus eliminate ineligible first heart sound and the waveform of second heart sound, described systole time ts be first heart sound waveform starting point and and its starting point being in the second heart sound waveform of same cardiac cycle between duration, described relaxing period time td be described second heart sound waveform starting point and be in adjacent next cardiac cycle T first heart sound waveform starting point between duration.It should be noted that, fetus Ventricular systole time ts is shorter than relaxing period time td, and fetus Ventricular systole time ts relative constancy compared with relaxing period time td, all belongs to general knowledge known in this field;
Described computation subunit is used for according to the position of each first heart sound waveform in described signal envelope and the position of each second heart sound waveform, duration between the starting point/end point calculating often adjacent two first heart sound waveforms respectively, duration between the starting point/end point of every adjacent two second heart sound waveforms, obtain multiple heart rate value based on first heart sound and multiple heart rate value based on second heart sound, be averaging to draw Fetal Heart Rate to multiple heart rate value based on first heart sound and multiple heart rate value based on second heart sound;
Described display subelement is connected with computation subunit, for showing the Fetal Heart Rate that computation subunit exports;
Described coded sub-units is also connected with broadcasting subelement, for being become the audio file of the forms such as WAV or MP3 by described by digital coding except the fetal heart sound signal of telecommunication after process of making an uproar, and described audio file is sent to broadcasting subelement; Described coded sub-units can adopt existing audio coder;
Described broadcasting subelement is for playing described audio file;
Described storing sub-units is connected with computation subunit with coded sub-units respectively, for the audio file that memory encoding subelement exports, and stores the Fetal Heart Rate of computation subunit output; Described storing sub-units can adopt the memory devices such as SD card;
Described mutual subelement is connected with computation subunit with coded sub-units respectively, for the audio file that coded sub-units is exported, miscellaneous equipment is sent to the Fetal Heart Rate that computation subunit exports, such as described audio file and Fetal Heart Rate can be sent to anemia of pregnant woman and relatives and friends thereof, thus allow everybody all hear clean fetal heart sound clearly, share pregnant happy of anemia of pregnant woman, promote affection exchange, also described audio file and Fetal Heart Rate can be sent to other doctors, thus provide information for doctor, facilitate anemia of pregnant woman to obtain medical advice and help etc.
Preferably, the signal transmission form between described mutual subelement and miscellaneous equipment is: any one in NFC transmission means, ZigBee transmission means, Wi-Fi transmission means, Bluetooth transmission mode, the ZigBee transmission means being guided pairing by NFC, the Wi-Fi transmission means being guided pairing by NFC, the Bluetooth transmission mode being guided pairing by NFC, USB transmission means and mail transmission mode.
It should be noted that, acoustic-electric conversion subelement, frequency overlapped-resistable filter, preamplifier, process subelement, feature identification subelement, computation subunit, display subelement, coded sub-units, broadcasting subelement, storing sub-units and mutual subelement described in the present embodiment, existing integrated circuit modules all can be adopted to realize, therefore its concrete structure is not described and restriction.
Certainly, described in the present embodiment, fetal heart sound signal detection and treatment device also can adopt the mode that integrated circuit modules combines with mobile intelligent terminal, such as, acoustic-electric conversion subelement, frequency overlapped-resistable filter and preamplifier adopt existing integrated circuit to realize, process subelement, feature identification subelement, computation subunit, display subelement, coded sub-units, play subelement, storing sub-units and mutual subelement can adopt mobile intelligent terminal to realize, particularly, frequency overlapped-resistable filter export through amplify, except the fetal heart sound signal of telecommunication after process of making an uproar enters mobile intelligent terminal through audio transmission line by audio interface, display subelement, coded sub-units, play subelement, the function of storing sub-units and mutual subelement can adopt the hardware in mobile intelligent terminal to realize, and process subelement, the function of feature identification subelement and computation subunit by installing supporting APP to realize on mobile intelligent terminal.
Fetal heart sound signal detection and treatment device described in the present embodiment not only can not have an impact to fetus when gathering fetal heart sound acoustical signal, and can the fetal heart sound acoustical signal collected well be processed, obtain the information such as Fetal Heart Rate, the Fetal Heart Rate drawn can also be shown, broadcast encoder becomes the clean fetal heart sound signal of telecommunication of audio file, store Fetal Heart Rate and described audio file, and Fetal Heart Rate and described audio file are sent to miscellaneous equipment.
Other structures in the present embodiment and effect all identical with embodiment 1, repeat no more here.
Be understandable that, the illustrative embodiments that above embodiment is only used to principle of the present invention is described and adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (10)
1. a fetal heart sound signal detection and treatment device, comprises detecting signal unit and signal processing unit, it is characterized in that, described signal processing unit comprises process subelement, feature identification subelement and computation subunit,
Described detecting signal unit is connected with the process subelement in signal processing unit, for gathering fetal heart sound acoustical signal from her abdominal, is sent to process subelement after converting described fetal heart sound acoustical signal to the fetal heart sound signal of telecommunication;
Described process subelement is also connected with feature identification subelement, for carrying out except process of making an uproar to the described fetal heart sound signal of telecommunication, extracting the signal envelope of the fetal heart sound signal of telecommunication after except process of making an uproar, and described signal envelope is sent to feature identification subelement;
Described feature identification subelement is also connected with computation subunit, for the position of the position He each second heart sound waveform of identifying each first heart sound waveform in described signal envelope respectively, and is sent to computation subunit;
Described computation subunit is used for according to the position of each first heart sound waveform in described signal envelope and the position of each second heart sound waveform, duration between the starting point/end point calculating often adjacent two first heart sound waveforms respectively, duration between the starting point/end point of every adjacent two second heart sound waveforms, obtain multiple heart rate value based on first heart sound and multiple heart rate value based on second heart sound, be averaging to draw Fetal Heart Rate to described multiple heart rate value based on first heart sound and multiple heart rate value based on second heart sound.
2. device according to claim 1, is characterized in that,
Described detecting signal unit comprises the coupling operatic tunes and acoustic-electric conversion subelement,
One end of the described coupling operatic tunes contacts with her abdominal, and the other end and acoustic-electric are changed subelement and be connected, for gathering fetal heart sound acoustical signal and sending acoustic-electric conversion subelement to;
Described acoustic-electric conversion subelement is connected with the process subelement in signal processing unit, after converting described fetal heart sound acoustical signal to the fetal heart sound signal of telecommunication, be sent to process subelement.
3. device according to claim 2, is characterized in that,
Described detecting signal unit also comprises preamplifier and frequency overlapped-resistable filter,
Described preamplifier is changed subelement with acoustic-electric respectively and is connected with frequency overlapped-resistable filter, carries out processing and amplifying, and the fetal heart sound signal of telecommunication after processing and amplifying is sent to frequency overlapped-resistable filter for the fetal heart sound signal of telecommunication exported acoustic-electric conversion subelement;
Described frequency overlapped-resistable filter is connected with the process subelement in signal processing unit with preamplifier respectively, for the high-frequency noise in the fetal heart sound signal of telecommunication after the processing and amplifying that filtering preamplifier exports, and the fetal heart sound signal of telecommunication after filter away high frequency noise is sent to process subelement.
4. device according to claim 1, is characterized in that,
Described signal processing unit also comprises display subelement,
Described display subelement is connected with computation subunit, for showing the Fetal Heart Rate that computation subunit exports.
5. device according to claim 1, is characterized in that,
Described signal processing unit also comprises coded sub-units and plays subelement, described coded sub-units respectively with process subelement with play subelement and be connected,
Described process subelement is also for being sent to coded sub-units by except the fetal heart sound signal of telecommunication after process of making an uproar;
Described coded sub-units is used for becoming audio file by except the fetal heart sound signal of telecommunication after process of making an uproar by digital coding, and described audio file is sent to broadcasting subelement;
Described broadcasting subelement is for playing described audio file.
6. device according to claim 5, is characterized in that,
Described signal processing unit also comprises storing sub-units,
Described storing sub-units is connected with coded sub-units and/or computation subunit, for the audio file that memory encoding subelement exports, and/or, the Fetal Heart Rate that computation subunit exports.
7. device according to claim 5, is characterized in that,
Described signal processing unit also comprises mutual subelement,
Described mutual subelement is connected with coded sub-units and/or computation subunit respectively, and for the audio file exported by coded sub-units, and/or the Fetal Heart Rate that computation subunit exports is sent to miscellaneous equipment.
8. device according to claim 7, is characterized in that,
Signal transmission form between described mutual subelement and miscellaneous equipment is: any one in NFC transmission means, ZigBee transmission means, Wi-Fi transmission means, Bluetooth transmission mode, the ZigBee transmission means being guided pairing by NFC, the Wi-Fi transmission means being guided pairing by NFC, the Bluetooth transmission mode being guided pairing by NFC, USB transmission means and mail transmission mode.
9. the device according to any one of claim 1 ~ 8, is characterized in that,
Described feature identification subelement comprises coarse positioning module, thin locating module and searches module,
Described coarse positioning module is connected with thin locating module with process subelement respectively, described process subelement is used for the coarse positioning module be sent to by described signal envelope in feature identification subelement, described coarse positioning module is for obtaining first threshold T1, with the point found out all amplitudes and be greater than first threshold T1 to (N1-N) individual point for the N number of o'clock at described signal envelope, and preserve its positional information, to form coarse positioning signal, and described coarse positioning signal is sent to thin locating module, wherein
T1＝0.25*MAX1(1)
In formula (1), MAX1 be the N number of o'clock of described signal envelope to the amplitude maximum point in (N1-N) individual point, N1 is the length of described signal envelope, N=fs* (t1+t2), fs is sample frequency, t1 is the time limit of first heart sound, and t2 is the time limit of second heart sound;
Described thin locating module also with search module and be connected, described thin locating module is for obtaining Second Threshold T2, with the point found out all amplitudes and be greater than Second Threshold T2 to (N2-N) individual point for the N number of o'clock at described coarse positioning signal, and preserve its positional information, to form thin framing signal, and described thin framing signal is sent to searches module, wherein
T2＝0.05*MAX2(2)
In formula (2), MAX2 be the N number of o'clock of described coarse positioning signal to the amplitude maximum point in (N2-N) individual point, N2 is the length of coarse positioning signal, N=fs* (t1+t2), fs is sample frequency, t1 is the time limit of first heart sound, and t2 is the time limit of second heart sound;
Described searching in module is preset with the first step-length L1 and the second step-length L2, wherein,
L1＝fs*t1(3)
L2＝fs*t2(4)
In formula (3) and formula (4), fs is sample frequency, and t1 is the time limit of first heart sound, and t2 is the time limit of second heart sound;
Described module of searching also is connected with computation subunit, the waveform that all starting points to the duration of terminating point meets the first step-length L1 is searched backward successively for the top from described thin framing signal, and the waveform that all starting points to the duration of terminating point meets the second step-length L2 is searched backward successively from the top of described thin framing signal, with the position of the position He each second heart sound waveform of identifying each first heart sound waveform respectively, and be sent to computation subunit.
10. device according to claim 9, is characterized in that,
Described feature identification subelement also comprises screening module, described screening module respectively with search module and be connected with computation subunit, for screening the position of the position and each second heart sound waveform of searching each first heart sound waveform that Module recognition goes out, retain and allly meet the fetus Ventricular systole time in corresponding cardiac cycle and be less than the position of the first heart sound waveform of relaxing period time conditions and the position of second heart sound waveform, the described systole time be first heart sound waveform starting point and and its starting point being in the second heart sound waveform of same cardiac cycle between duration, the described relaxing period time be described second heart sound waveform starting point and be in next cardiac cycle adjacent first heart sound waveform starting point between duration.
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