CN105105742B - A kind of fetus movement of the foetus fetal heart rate signal monitoring system and method - Google Patents
A kind of fetus movement of the foetus fetal heart rate signal monitoring system and method Download PDFInfo
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- CN105105742B CN105105742B CN201510427488.0A CN201510427488A CN105105742B CN 105105742 B CN105105742 B CN 105105742B CN 201510427488 A CN201510427488 A CN 201510427488A CN 105105742 B CN105105742 B CN 105105742B
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Abstract
It is monitored the invention discloses a kind of fetus movement of the foetus fetal heart rate signal and is connected with monitoring unit on system and method, including CPU, CPU and for the power module of power supply；Monitoring unit is acquired respectively, is filtered using movement of the foetus observation circuit and fetal rhythm observation circuit, obtains Fetal Movement Signal and fetal heart rate signal；Fetal Movement Signal carries out digital sample by the AD1 pin of CPU；Fetal heart rate signal is by being directly connected to the AD2 pin of CPU after the bandpass filtering modules block in movement of the foetus observation circuit, digital sample is also carried out by the AD3 pin that the trapper module in movement of the foetus observation circuit is connected to CPU, the Hz noise for filtering out human body obtains clean fetal heart rate signal.The present invention realizes movement of the foetus and fetal rhythm acquisition and detection using piezoelectric transducer technology, parent and fetus will not be caused to radiate, the signal that pregnant woman's gurgling sound, abdomen blood flow sound etc. can interfere fetal rhythm and movement of the foetus can be removed, more accurate fetal rhythm and Fetal Movement Signal, application value with higher are detected simultaneously.
Description
Technical field
The invention belongs to medicine and hygiene fields, especially design the system of a kind of fetal rhythm for fetus and Fetal Movement Signal monitoring
And method.
Background technique
Pregnant woman other than needing periodically to arrive special hospital and check UP, also wants the carry out of not timing various certainly in the entire pregnancy period
Inspection.In various self-test projects, the fetal rhythm and movement of the foetus for measuring fetus are the important indicators for judging fetal vital sign, from pregnant early stage
Start daily require the fetal rhythm to fetus, movement of the foetus checks, to grasp the growth and development situation of fetus at any time.Especially
It is some advanced ages, high risk gravida, self-test may be needed multiple daily, and records from survey result.
Because fetal rhythm and Fetal Movement Signal are fainter, and heartbeat of the meeting such as pregnant woman's gurgling sound, abdomen blood flow sound to fetus
It is interfered with Fetal Movement Signal, only carries out fetal rhythm detection or the tire of unitem for the detection of fetus fetal rhythm movement of the foetus at present
Dynamic detection, cannot carry out detection simultaneously and fetal rhythm detection or movement of the foetus detection are inaccurate, and fault rate is high, therefore, present
Fetal rhythm and movement of the foetus detection technique are no longer satisfied current needs.
Summary of the invention
The object of the present invention is to provide a kind of fetus movement of the foetus fetal heart rate signals to monitor system and method, using piezoelectric transducer skill
Art come realize movement of the foetus and fetal rhythm acquisition and detection, parent and fetus will not be caused to radiate, pregnant woman's gurgling sound, abdomen can be removed
The signal that blood flow sound etc. can interfere fetal rhythm and movement of the foetus, while detecting more accurate fetal rhythm and Fetal Movement Signal.
In order to achieve the above objectives, the present invention, which adopts the following technical scheme that, is achieved：
Power module, for powering to whole system；
Piezoelectric transducer module, for acquiring the movement of the foetus fetal rhythm original signal of fetus；
Amplify filter module, the movement of the foetus fetal rhythm original signal for will receive is amplified and filtered (filters for the first time
Wave)；
Bandpass filtering modules block, for filtering interference signal, the movement of the foetus fetal heart rate signal needed；
Processing and control module, i.e. CPU, for carrying out digital sample respectively to movement of the foetus and fetal heart rate signal；
Comparator module, for filtering out Fetal Movement Signal；
Level switch module, the electrical characteristic for matching detection signal and CPU pin；
Trapper module obtains fetal heart rate signal for filtering out the Hz noise of human body；
Monitoring unit and the power module for power supply are connected on CPU；Monitoring unit mainly includes movement of the foetus observation circuit
With fetal rhythm observation circuit, movement of the foetus observation circuit includes sequentially connected piezoelectric transducer module, amplification filter module, bandpass filtering
Module, bandpass filtering modules block are directly connected to the AD1 pin of CPU, be also connected in turn after bandpass filtering modules block comparator module and
Level switch module, level switch module are connected to the external interrupt pin of CPU；Fetal rhythm observation circuit includes and movement of the foetus observation circuit
The identical piezoelectric transducer module of structure, amplification filter module and bandpass filtering modules block；Piezoelectric transducer module, amplification filtering mould
After block and bandpass filtering modules block are sequentially connected, bandpass filtering modules block is directly connected to the AD2 pin of CPU, goes back after bandpass filtering modules block
It is connected with trapper module, trapper module is connected to the AD3 pin of CPU.
Further, at least provided with one group, all monitoring unit are disposed adjacent around little Bai dot monitoring unit.
Further, monitoring unit array is arranged, in the horizontal direction, centered on little Bai dot, spaced set；
In vertical direction, centered on little Bai dot, spaced set.
Further, in the horizontal direction, the spacing of adjacent monitoring unit is 5CM；In vertical direction, adjacent monitoring is single
The spacing of member is 4CM.
Further, power module use USB or battery powered mode, processing and control module be equipped with USB interface and
Battery interface, USB interface are connected to USB 5V DC power supply.
A kind of fetus movement of the foetus fetal heart rate signal monitoring method, includes the following steps：
Step 1：Each monitoring unit is divided to two branch acquisition movement of the foetus fetal rhythm original signals, and amplifies filtering respectively,
Fetal Movement Signal and fetal heart rate signal are obtained by bandpass filtering again；
Step 2：In first branch, comparator and level conversion are passed through by the Fetal Movement Signal obtained after bandpass filtering again
Device filters out clean Fetal Movement Signal；
In Article 2 branch, trapper is passed through by the fetal heart rate signal obtained after bandpass filtering again and filters out clean fetal rhythm letter
Number；
Step 3：In first branch, CPU opens external interrupt, and external interrupt is waited to generate, and is turned by comparator and level
The Fetal Movement Signal obtained after parallel operation screening passes through the external interrupt pin that CPU is sent into the channel INT again, by what is obtained after bandpass filtering
Fetal Movement Signal is sent into the AD1 pin of CPU by the channel ADIN1, in conjunction with analog signal sampling and movement of the foetus monitoring algorithm, obtains tire
The movement of the foetus intensity of youngster；
In Article 2 branch, the AD2 pin for being sent into CPU in the channel ADIN2 is passed through by the fetal heart rate signal obtained after bandpass filtering
Digital sample is carried out, then the fetal heart rate signal obtained after being screened by trapper is sent into the AD3 pin of CPU by the channel ADIN3, then ties
Quasi- signal sampling and fetal rhythm monitoring algorithm are molded, the palmic rate of fetus is obtained.
Specifically, being in conjunction with the specific processing mode that movement of the foetus monitoring algorithm carries out digital sample in first branch：
1) the input sample window size in the channel ADIN1 is arranged in；
2) opens the input sample function in the channel ADIN1；
3) opens the external interrupt of CPU；
4) waits movement of the foetus interrupt signal, and judges whether to generate external interrupt；
5) closes external interrupt when there is external interrupt generation；Otherwise operation 4) is continued to execute；
6) after closes external interrupt, the shifting for interrupting ADIN1 channel sample signal when generating is calculated using rolling average algorithm
Dynamic average value, and judge whether the moving average of ADIN1 channel sample signal is greater than normal Fetal Movement Signal threshold value；
7) generates a movement of the foetus, and shake rails fatigue resistance if moving average is greater than normal Fetal Movement Signal threshold value；It is no
Then continue to execute operation 4).
Specifically, being in conjunction with the specific processing mode that fetal rhythm monitoring algorithm carries out digital sample in Article 2 branch：
1) the sampling window size in the channel ADIN2, the channel ADIN3 is arranged in；
2) opens the input sample function in the channel ADIN2, the channel ADIN3；
3) is successively sampled the sampled signal size in every road monitoring channel by sample frequency, and judges whether to reach sample window
Mouthful；
4) is calculated using rolling average algorithm when reaching sampling window and is interrupted ADIN2 channel sample signal when generating
Moving average, then judge whether the moving average of ADIN2 channel sample signal is greater than normal fetal heart rate signal threshold value；
5) is when the moving average of ADIN2 channel sample signal is greater than normal fetal heart rate signal threshold value, further according to movement of the foetus
Monitoring algorithm judges in epicycle sampling window with the presence or absence of effective Fetal Movement Signal；Otherwise, continue operation 3)；
6) is when being not present effective Fetal Movement Signal in epicycle sampling window, to the sampled data in the channel ADIN2, ADIN3
Fast Fourier Transform (FFT) is carried out, to obtain the frequency characteristic of sampled signal；Otherwise, continue operation 3)；
7) adds up the amplitude of the identical frequency component in the channel ADIN2, the channel ADIN3；
8) corresponding frequency of frequency component according to obtained in sampling window calculating 7)；
9) records the frequency being calculated in 8), this frequency is the palmic rate of fetus.
Rolling average algorithm is：
1) assumes that the window size of sample space is N, and moving window is equal to W, wherein N>=W, every W point calculate primary
The signal amplitude that the average value of sampled signal is sampled as this；
2) then. acquires a point of new W ' instead of most starting W point of acquisition in sample space again, and calculates its average value
As next round sampling signal amplitude, and so on.
Fast fourier transform algorithm is：
1) provides array A1(N), A2(N) and ω (N/2)；
2) is by the plural array { x of known recordkIt is input to unit A1(k) in, k value is 0 to N-1；
3) calculates ωm=exp (- i2 π m/N) is stored in unit ω (m), and m value is 0 to (N/2) -1；
4) 6) .q circulation, if q is 5) odd number executes, is otherwise executed from 1 to p；
5) .k circulation is from 0 to 2p-q-1, j circulation is from 0 to 2p-1- 1, it calculates
A2(k2q+ j)=A1(k2q-1+j)+A1(k2q-1+j+2p-1)
A2(k2q+j+2q-1)=[A1(k2q-1+j)-A2(k2q-1+j+2q-1)]ω(k2q-1) execute 7)；
6) .k circulation is from 0 to 2p-q- 1, j are recycled from 0 to 2q-1, calculate
A1(k2q+ j)=A2(k2q-1+j)+A2(k2q-1+j+2p-1)
A1(k2q+j+2q-1)=[A2(k2q-1+j)-A2(k2q-1+j+2q-1)]ω(k2q-1)
K, j circulation terminate, and perform the next step；
7) 8) if. q=p is executed, otherwise 4) q+1 → q is executed；
8) .q circulation terminates, if p=even number, by A1(j)→A2(j), then cj=A2(j) (j=0,1,2 ... N-1) is
It is required.
Compared with prior art, the invention has the advantages that：
Monitoring unit of the invention acquires movement of the foetus tire using movement of the foetus observation circuit and fetal rhythm observation circuit (dividing two-way) respectively
Heart original signal, then collected movement of the foetus fetal rhythm original signal is screened respectively, filter out pregnant woman's gurgling sound, abdomen blood flow
The interference signals such as sound have achieved the purpose that while having acquired Fetal Movement Signal and fetal heart rate signal；And wherein, movement of the foetus observation circuit pass through by
Piezoelectric transducer module is amplified after filter module, bandpass filtering modules block, comparator module and level switch module are sequentially connected again
It is connected to the external interrupt of CPU, the sampling branch constituted further through the AD1 pin for being directly connected to CPU after bandpass filtering modules block subtracts
Small external disturbance bring erroneous judgement, improves the detection accuracy of Fetal Movement Signal, compared to technology before, movement of the foetus letter of the invention
It is number cleaner, it is more acurrate；Fetal rhythm observation circuit by by piezoelectric transducer module, amplification filter module and bandpass filtering modules block according to
The sampling branch that also is provided with directly being connected to the AD2 pin of CPU after secondary connection, after bandpass filtering modules block and constitute, bandpass filtering mould
The AD3 pin of CPU is connected to after block further through trapper module；Wherein, the effect of trapper is the Hz noise for filtering out human body,
CPU samples the input signal on AD2 and AD3 pin, and AD2 sampled value is for judging signal threshold value, and AD3 sampled value is first
It is handled by rolling average algorithm, then uses Fourier transformation, signal is transformed into frequency domain from time domain, to obtain letter
Number frequency domain distribution, can be obtained by clean fetal heart rate signal in this way, compare between technology have very big improvement；And this hair
The bright rolling average algorithm used and Fourier transformation etc. also made positive contributions for filtering interference signals；Therefore, this hair
It is bright that movement of the foetus and fetal rhythm acquisition and detection are realized using piezoelectric transducer technology, parent and fetus will not be caused to radiate, it can
The signal that removal pregnant woman's gurgling sound, abdomen blood flow sound etc. can interfere fetal rhythm and movement of the foetus, while detecting more accurate tire
The heart and Fetal Movement Signal, application value with higher.
Detailed description of the invention
System structure diagram Fig. 1 of the invention；
Monitoring unit distribution map Fig. 2 of the invention；
Detection method schematic diagram Fig. 3 of the invention；
Movement of the foetus observation circuit figure Fig. 4 of the invention；
Fetal rhythm observation circuit figure Fig. 5 of the invention；
Movement of the foetus monitoring algorithm schematic diagram Fig. 6 of the invention；
Fetal rhythm monitoring algorithm schematic diagram Fig. 7 of the invention.
Specific embodiment
Illustrate the embodiment of the present invention with reference to the accompanying drawing.
The object of the present invention is to provide a kind of fetus movement of the foetus fetal heart rate signals to monitor system and method, using piezoelectric transducer skill
Art come realize movement of the foetus and fetal rhythm acquisition and detection, parent and fetus will not be caused to radiate, pregnant woman's gurgling sound, abdomen can be removed
The signal that blood flow sound etc. can interfere fetal rhythm and movement of the foetus, while detecting fetal rhythm and Fetal Movement Signal, and the fetal rhythm tire of fetus
Dynamic inspection is more accurate.
With reference to Fig. 1, a kind of fetus movement of the foetus fetal heart rate signal monitoring system, including：
Power module, for powering to whole system；
Piezoelectric transducer module, for acquiring the movement of the foetus fetal rhythm original signal of fetus；
Amplify filter module, the movement of the foetus fetal rhythm original signal for will receive is amplified and filtered (filters for the first time
Wave)；
Bandpass filtering modules block, for filtering interference signal, the movement of the foetus fetal heart rate signal needed；
Processing and control module, i.e. CPU, for carrying out digital sample respectively to movement of the foetus and fetal heart rate signal；
Comparator module, for filtering out Fetal Movement Signal；
Level switch module, the electrical characteristic for matching detection signal and CPU pin；
Trapper module obtains fetal heart rate signal for filtering out the Hz noise of human body；
With reference to Fig. 1, the specific structure of this monitoring system is：
Including processing and control module, processing and control module CPU, CPU are connected with the power module for power supply, power supply mould
For block by the way of USB power supply, processing and control module is equipped with USB interface, and USB interface is connected to 5V DC power supply；CPU is also connected with
There is monitoring unit；Monitoring unit is equipped with several groups, depending on the quantity of monitoring unit；Each group of monitoring unit mainly includes tire
Dynamic observation circuit and fetal rhythm observation circuit；Wherein movement of the foetus observation circuit includes sequentially connected piezoelectric transducer module, amplification filter
Wave module, bandpass filtering modules block, bandpass filtering modules block are directly connected to the AD1 pin (the first high-precision AD Sampling Interface) of CPU, band
Also it is connected with comparator module and level switch module after pass filtering module in turn, the I/O that level switch module is connected to CPU draws
Foot, the I/O pin are the external interrupt pin of software configuration；Fetal rhythm observation circuit includes identical as movement of the foetus observation circuit structure
The piezoelectric transducer module, amplification filter module and bandpass filtering modules block of (but the parameter of component is different)；Piezoelectric transducer mould
After block, amplification filter module and bandpass filtering modules block are sequentially connected, it also is provided with being directly connected to the AD2 of CPU after bandpass filtering modules block
Pin (the second high-precision AD Sampling Interface) and the sampling branch constituted, are also connected with trapper module after bandpass filtering modules block,
Trapper module is connected to the AD3 pin (third high-precision AD Sampling Interface) of CPU.
The piezoelectric transducer module of the present embodiment is original using the fetal rhythm movement of the foetus of HKY-06 type piezoelectric transducer acquisition fetus
Signal, acquisition signal frequency range is 0~600HZ, and amplitude output signal 0.5~1V, HKY-06 type piezoelectric transducer can be examined
Small vibration is measured, and the pressure signal that vibration is formed is converted into corresponding electric signal, its advantage is, radiationless,
Bandwidth, high sensitivity.
Since meeting persistent movement, cardiac position also can constantly change fetus in parent, and in different gestational period tires
Dynamic signal is different with the strong position of uterine contraction signal.It is more accurate when for signal extraction, each monitoring of the present embodiment
The layout of unit as shown in Fig. 2, monitoring unit array arranges that each small bullet is the identical monitoring unit of structure,
Centered on little Bai dot (i.e. pregnant woman's navel)；In the horizontal direction, it is provided with the small black circle for being 5CM with little Bai dot spacing
Point, the small bullet spacing on small bullet and other horizontal directions adjacent to little Bai dot is also 5CM；In vertical direction
On, it is provided with the small bullet for being 4CM with little Bai dot spacing, adjacent to the small bullet and other vertical direction of little Bai dot
On small bullet spacing be also 4CM；By above setting, this system can be from the movement of the foetus of multi pass acquisition pregnant woman foetus
And fetal heart rate signal, meanwhile, each monitoring unit can handle movement of the foetus and the fetal heart rate signal at respective position simultaneously, handle well
Afterwards, it is sent to respective high-precision AD Sampling Interface on CPU respectively and carries out digital sample.
Specifically, the movement of the foetus observation circuit figure of each monitoring unit, as shown in Figure 4：SENSOR is that piezoelectric transducer is defeated
Movement of the foetus fetal rhythm original signal out, the signal output end of the piezoelectric transducer of movement of the foetus observation circuit are connected with capacitor C1, capacitor C1
Cathode be connected with operational amplifier U1A, the cathode of capacitor C1 is connected to the non-inverting input terminal of operational amplifier U1A, capacitor C1
Cathode be also connected with the resistance R2 of the resistance R1 and ground connection that are connected to 5V voltage；The inverting input terminal of operational amplifier U1A according to
It is secondary to be connected with resistance R3 and capacitor C2, the cathode ground connection of capacitor C2；The inverting input terminal of operational amplifier U1A is also connected with size
Adjustable resistance R4 (slide rheostat), the cathode of resistance R4 are connected to the signal output end of operational amplifier U1A；Operation is put
The power end of big device U1A is connected to 5V voltage, the ground terminal ground connection of operational amplifier U1A；——————————→
Referred to herein as amplify filter module
The signal output end of operational amplifier U1A is connected with resistance R5, the cathode of resistance R5 be connected in turn capacitor C3 and
Operational amplifier U2A, capacitor C3 are connected to the inverting input terminal of operational amplifier U2A；The cathode of resistance R5 is also connected with resistance
R6, resistance R6 ground connection；The non-inverting input terminal of operational amplifier U2A is connected with resistance R8, and resistance R8 is connected to 5V voltage；Operation amplifier
The non-inverting input terminal of device U2A is also connected with resistance R9, resistance R9 ground connection；The signal output end of operational amplifier U2A is connected with electricity
Hold C4, the cathode of capacitor C4 is connected to the anode of capacitor C3；The output end of operational amplifier U2A is also connected with resistance R7, electricity
The other end of resistance R7 is connected to the inverting input terminal of operational amplifier U2A；The power end of operational amplifier U2A is connected to 5V electricity
Pressure, the ground terminal ground connection of operational amplifier U2A；As shown in Figure 1, the signal output end (ADIN1) of operational amplifier U2A is connected to
The AD1 pin of CPU；--- --- --- --- → it is referred to herein as bandpass filtering modules block
The signal output end (ADIN1) of operational amplifier U2A is connected with operational amplifier U3A, operational amplifier U2A connection
In the non-inverting input terminal of operational amplifier U3A；The reversed phase input terminal of operational amplifier U3A is connected with the resistance of adjustable section
R10 (slide rheostat), the other end of resistance R10 are connected to 5V voltage；The inverting input terminal of operational amplifier U3A is also connected with
Resistance R11, resistance R11 ground connection；The power end of operational amplifier U3A is connected to 5V voltage, the ground connection termination of operational amplifier U3A
Ground；--- --- --- --- → it is referred to herein as comparator module
The signal output end of operational amplifier U3A is connected with resistance R12, and the other end of resistance R12 is connected with the three of NPN type
Pole pipe Q1, resistance R12 are connected to the base stage of triode Q1, the emitter ground connection of triode Q1；The collector of triode Q1 is successively
It is connected with resistance R13, resistance R14 and resistance R15, resistance R15 ground connection；The collector of triode Q1 is also connected with triode Q2,
The collector of triode Q1 is connected to the base stage of triode Q2, the emitter ground connection of triode Q2；The collector of triode Q2
(INT) it is connected with resistance R16, resistance R16 is connected to the common end of resistance R14 and resistance R15；As shown in Figure 1, triode Q2
Collector (INT) is connected to the I/O pin (external interrupt that the I/O pin is CPU) of CPU；——————————
→ it is referred to herein as level switch module
The fetal rhythm observation circuit figure of each monitoring unit, (Fig. 4 is different circuit diagrams, label from Fig. 5 as shown in Figure 5
Identical component is independent of each other in respective circuit)：SENSOR is the original letter of movement of the foetus fetal rhythm of piezoelectric transducer output
Number, the signal output end of the piezoelectric transducer of movement of the foetus observation circuit is connected with capacitor C1, and the cathode of capacitor C1 is connected with operation and puts
Big device U1A, the cathode of capacitor C1 are connected to the non-inverting input terminal of operational amplifier U1A, and the cathode of capacitor C1 is also connected with connection
In the resistance R1 of the 5V voltage and resistance R2 of ground connection；The inverting input terminal of operational amplifier U1A is connected with resistance R3 and electricity in turn
Hold C2, the cathode ground connection of capacitor C2；The resistance R4 that the inverting input terminal of operational amplifier U1A is also connected with adjustable section is (sliding
Dynamic rheostat), the cathode of resistance R4 is connected to the signal output end of operational amplifier U1A；The power end of operational amplifier U1A connects
It is connected to 5V voltage, the ground terminal ground connection of operational amplifier U1A；--- --- --- --- → referred to herein as amplification filters mould
Block
The signal output end of operational amplifier U1A is connected with resistance R5, the cathode of resistance R5 be connected in turn capacitor C3 and
Operational amplifier U2A, capacitor C3 are connected to the inverting input terminal of operational amplifier U2A；The cathode of resistance R5 is also connected with resistance
R6, resistance R6 ground connection；The non-inverting input terminal of operational amplifier U2A is connected with resistance R8, and resistance R8 is connected to 5V voltage；Operation amplifier
The non-inverting input terminal of device U2A is also connected with resistance R9, resistance R9 ground connection；The signal output end of operational amplifier U2A is connected with electricity
Hold C4, the cathode of capacitor C4 is connected to the anode of capacitor C3；The output end of operational amplifier U2A is also connected with resistance R7, electricity
The other end of resistance R7 is connected to the inverting input terminal of operational amplifier U2A；The power end of operational amplifier U2A is connected to 5V electricity
Pressure, the ground terminal ground connection of operational amplifier U2A；As shown in Figure 1, the signal output end (ADIN2) of operational amplifier U2A is connected to
The AD2 pin of CPU；--- --- --- --- → it is referred to herein as bandpass filtering modules block
The signal output end of operational amplifier U2A is connected with capacitor R5, the cathode of capacitor R5 be connected in turn resistance R10 and
Resistance R11, the cathode of capacitor R5 are also connected with capacitor C6 and capacitor C7 in turn, and the cathode of resistance R11 and capacitor C7 are connected with fortune
Calculate amplifier U3A；The cathode of resistance R11 and capacitor C7 are connected to the inverting input terminal of operational amplifier U3A；Resistance R10 and electricity
The common end of resistance R11 is connected with capacitor C8, capacitor C8 ground connection；The common end of capacitor C6 and capacitor C7 are connected with resistance R12, resistance
R12 ground connection；The non-inverting input terminal of operational amplifier U3A is connected with resistance R13, resistance R13 ground connection；The electricity of operational amplifier U3A
Source is connected to 5V voltage, the ground terminal ground connection of operational amplifier U3A；The signal output end (ADIN3) of operational amplifier U3A is even
It is connected to resistance R14, resistance R14 is connected to the common end of the non-inverting input terminal of resistance R13 and operational amplifier U3A；Such as Fig. 1 institute
Show, the signal output end (ADIN3) of operational amplifier U3A is connected to the AD3 pin of CPU.——————————→
Referred to herein as bandpass filtering modules block
As shown in figure 3, a kind of fetus movement of the foetus fetal heart rate signal monitoring method, includes the following steps：
Step 1：Each monitoring unit is divided to two branch acquisition movement of the foetus fetal rhythm original signals, and amplifies filtering respectively,
Fetal Movement Signal and fetal heart rate signal are obtained by bandpass filtering again；
Step 2：In first branch, comparator and level conversion are passed through by the Fetal Movement Signal obtained after bandpass filtering again
Device filters out clean Fetal Movement Signal；
In Article 2 branch, trapper is passed through by the fetal heart rate signal obtained after bandpass filtering again and filters out clean fetal rhythm letter
Number；
Step 3：In first branch, CPU opens external interrupt, and external interrupt is waited to generate, and is turned by comparator and level
The Fetal Movement Signal obtained after parallel operation screening passes through the external interrupt pin that CPU is sent into the channel INT again, by what is obtained after bandpass filtering
Fetal Movement Signal is sent into the AD1 pin of CPU by the channel ADIN1, in conjunction with analog signal sampling and movement of the foetus monitoring algorithm, obtains tire
The movement of the foetus intensity of youngster；
In Article 2 branch, the AD2 pin for being sent into CPU in the channel ADIN2 is passed through by the fetal heart rate signal obtained after bandpass filtering
Digital sample is carried out, then the fetal heart rate signal obtained after being screened by trapper is sent into the AD3 pin of CPU by the channel ADIN3, then ties
Quasi- signal sampling and fetal rhythm monitoring algorithm are molded, the palmic rate of fetus is obtained.
After being sent into the high-precision AD Sampling Interface of CPU by the Fetal Movement Signal obtained after bandpass filtering, using rolling average
Algorithm carries out digital sample, and the basic method of sampling is：
1) assumes that the window size of sample space is N, and moving window is equal to W, wherein N>=W, every W point calculate primary
The signal amplitude that the average value of sampled signal is sampled as this；
2) then. acquires a point of new W ' instead of most starting W point of acquisition in sample space again, and calculates its average value
As next round sampling signal amplitude, and so on.
As shown in Fig. 1,4,6, hardware parameter appropriate is selected, effective Fetal Movement Signal is by circuit transformations in the channel INT
Effective low level signal is exported, to trigger the external interrupt of CPU, the external interrupt of CPU is triggered, and is denoted as a movement of the foetus；
In order to reduce the erroneous judgement of external disturbance bring, software samples the voltage value in the channel ADIN1 simultaneously, i.e. Fetal Movement Signal becomes by piezoelectricity
It changes (piezoelectric transducer module) and amplifies the numerical value after filtering (bandpass filtering), specific algorithm is as shown in Figure 5：
In first branch, it is in conjunction with the specific processing mode that movement of the foetus monitoring algorithm carries out digital sample：
1) the input sample window size in the channel ADIN1 is arranged in；
2) opens the input sample function in the channel ADIN1；
3) opens the external interrupt of CPU；
4) waits movement of the foetus interrupt signal, and judges whether to generate external interrupt；
5) closes external interrupt when there is external interrupt generation；Otherwise operation 4) is continued to execute；
6) after closes external interrupt, the shifting for interrupting ADIN1 channel sample signal when generating is calculated using rolling average algorithm
Dynamic average value, and judge whether the moving average of ADIN1 channel sample signal is greater than normal Fetal Movement Signal threshold value；
7) generates a movement of the foetus, and shake rails fatigue resistance if moving average is greater than normal Fetal Movement Signal threshold value；It is no
Then continue to execute operation 4).
As shown in Figure 1 and Figure 7, the frequency of trapper is 50HZ, and effect is exactly to filter out the Hz noise of human body to obtain
Clean fetal heart rate signal, CPU carry out number to the input signal on AD2 pin and AD3 pin using the sample frequency of 10HZ and adopt
Sample；For judging signal threshold value, the sampled value of AD3 pin first passes around rolling average algorithm and (believes with movement of the foetus AD2 pin sampled value
It is number identical) it is handled, Fourier transformation is then used, signal is transformed into frequency domain from time domain, to obtain fetal heart rate signal
Frequency domain distribution；Meanwhile fetal rhythm monitoring algorithm is contemplated that the interference that fetus movement of the foetus monitors fetal rhythm.The tool of fetal rhythm monitoring algorithm
Body algorithm is as shown in Figure 6：
In Article 2 branch, it is in conjunction with the specific processing mode that fetal rhythm monitoring algorithm carries out digital sample：
1) the sampling window size in the channel ADIN2, the channel ADIN3 is arranged in；
2) opens the input sample function in the channel ADIN2, the channel ADIN3；
3) is successively sampled the sampled signal size in every road monitoring channel by sample frequency, and judges whether to reach sample window
Mouthful；
4) is calculated using rolling average algorithm when reaching sampling window and is interrupted ADIN2 channel sample signal when generating
Moving average, then judge whether the moving average of ADIN2 channel sample signal is greater than normal fetal heart rate signal threshold value；
5) is when the moving average of ADIN2 channel sample signal is greater than normal fetal heart rate signal threshold value, further according to movement of the foetus
Monitoring algorithm judges in epicycle sampling window with the presence or absence of effective Fetal Movement Signal；Otherwise, continue operation 3)；
6) is when being not present effective Fetal Movement Signal in epicycle sampling window, to the sampled data in the channel ADIN2, ADIN3
Fast Fourier Transform (FFT) is carried out, to obtain the frequency characteristic of sampled signal；Otherwise, continue operation 3)；
7) adds up the amplitude of the identical frequency component in the channel ADIN2, the channel ADIN3；
8) after amplitude is cumulative, the frequency component of amplitude peak is recorded；
9) calculates the corresponding frequency of frequency component in 8) according to sampling window；
10) records the frequency being calculated in 9), this frequency is the palmic rate of fetus.
In Article 2 branch, above-mentioned steps 5) in combine in movement of the foetus monitoring algorithm i.e. first branch movement of the foetus monitoring algorithm into
The specific processing mode of row digital sample.
In addition, specifically, fast fourier transform algorithm is：
1) provides array A1(N), A2(N) and ω (N/2)；
2) is by the plural array { x of known recordkIt is input to unit A1(k) in, k value is from 0 to N-1；
3) calculates ωm=exp (- i2 π m/N) is stored in unit ω (m), and m value is from 0 to (N/2) -1；
4) 6) .q circulation, if q is 5) odd number executes, is otherwise executed from 1 to p；
5) .k circulation is from 0 to 2p-q-1, j circulation is from 0 to 2p-1- 1, it calculates
A2(k2q+ j)=A1(k2q-1+j)+A1(k2q-1+j+2p-1)
A2(k2q+j+2q-1)=[A1(k2q-1+j)-A2(k2q-1+j+2q-1)]ω(k2q-1) execute 7)；
6) .k circulation is from 0 to 2p-q- 1, j are recycled from 0 to 2q-1, calculate
A1(k2q+ j)=A2(k2q-1+j)+A2(k2q-1+j+2p-1)
A1(k2q+j+2q-1)=[A2(k2q-1+j)-A2(k2q-1+j+2q-1)]ω(k2q-1)
K, j circulation terminate, and perform the next step；
7) 8) if. q=p is executed, otherwise 4) q+1 → q is executed；
8) .q circulation terminates, if p=even number, by A1(j)→A2(j), then cj=A2(j) (j=0,1,2 ... N-1) is
It is required.
Referring to Fig. 1~7, the invention will be further elaborated：
The extraction of fetal rhythm and Fetal Movement Signal uses piezoelectric transducer, and piezoelectric transducer is able to detect that small vibration, and
Corresponding electric signal is converted to, its advantage is, radiationless, bandwidth, high sensitivity.Fetal heartbeat and Fetal Movement Signal mention
The pressure signal for being to identify the small vibration of heart of fetus and limbs using piezoelectric transducer, and vibration is formed is taken to convert
At electric signal.
Since fetal rhythm and Fetal Movement Signal are fainter, and heartbeat of the meeting such as pregnant woman's gurgling sound, abdomen blood flow sound to fetus
It is interfered with Fetal Movement Signal, therefore the present invention uses method of the hardware in conjunction with software to the collected signal of piezoelectric transducer
It is handled.
The AD1 pin, AD2 pin and AD3 pin are the high-precision AD Sampling Interface of CPU, the original letter of movement of the foetus fetal rhythm
Periodic signal, the approximate pulse signal for reacting movement of the foetus intensity and other high frequencies or low frequency for number carrying reaction fetal rhythm frequency are made an uproar
Sound, movement of the foetus fetal rhythm original signal are sent in sequence to amplification filter module after the acquisition of the piezoelectric transducer module of movement of the foetus observation circuit
Filtering, the purer movement of the foetus fetal heart rate signal obtained after amplification filtering are amplified with bandpass filtering modules block；
Amplify the AD1 pin progress digital sample that filtered Fetal Movement Signal is sent to CPU.Through testing, movement of the foetus fetal rhythm is former
Fetal Movement Signal amplitude is maximum in beginning signal, generally in 200mv or more, and the amplification factor of movement of the foetus observation circuit as shown in Figure 4
It is 11 times or so, therefore is greater than the signal component of 2V if there is amplitude after digital sample, the external interrupt pin of CPU is closed
After closing, if the average value of ADIN1 channel sample signal be greater than normality threshold, generate a movement of the foetus, and record the movement of the foetus time and
Intensity, what is obtained after handling in this way is the pulse signal (Fetal Movement Signal) for reflecting movement of the foetus intensity；
The AD2 pin that the fetal heart rate signal obtained after amplification filtering is sent to CPU through fetal rhythm observation circuit carries out digital sample；
Meanwhile amplifying the fetal heart rate signal obtained after filtering the clean sinusoidal signal (tire for reacting fetal rhythm frequency of the filtering through trapper again
Heart signal) filtered fetal heart rate signal be basic fitting fetal heartbeat frequency sinusoidal signal, thus obtained carrying tire
The sinusoidal signal of frequency of heart；The AD3 pin that filtered fetal heart rate signal through trapper is sent to CPU carries out digital sample.
The high-precision AD Sampling Interface that Fetal Movement Signal and fetal heart rate signal are sent to CPU respectively carries out digital sample.It samples
The fetal heart rate signal arrived passes through rolling average algorithm, Fast Fourier Transform, software frequency spectrum parser and signals revivification algorithm etc.,
Obtain fetal heartbeat frequency and waveform；And it samples the obtained amplitude of Fetal Movement Signal and then reflects the position of fetus movement of the foetus and strong
Degree.
In conclusion monitoring unit of the invention acquires movement of the foetus tire using movement of the foetus observation circuit and fetal rhythm observation circuit respectively
Heart original signal, then collected movement of the foetus fetal rhythm original signal is screened respectively, filter out pregnant woman's gurgling sound, abdomen blood flow
The interference signals such as sound have achieved the purpose that while having acquired Fetal Movement Signal and fetal heart rate signal；And wherein, movement of the foetus observation circuit pass through by
Piezoelectric transducer module is amplified after filter module, bandpass filtering modules block, comparator module and level switch module are sequentially connected again
It is connected to the external interrupt of CPU, the sampling branch constituted further through the AD1 pin for being directly connected to CPU after bandpass filtering modules block subtracts
Small external disturbance bring erroneous judgement, improves the detection accuracy of Fetal Movement Signal, compared to technology before, movement of the foetus letter of the invention
It is number cleaner, it is more acurrate；Fetal rhythm observation circuit by by piezoelectric transducer module, amplification filter module and bandpass filtering modules block according to
The sampling branch that also is provided with directly being connected to the AD2 pin of CPU after secondary connection, after bandpass filtering modules block and constitute, bandpass filtering mould
The AD3 pin of CPU is connected to after block further through trapper module；Wherein, the effect of trapper is the Hz noise for filtering out human body,
CPU samples the input signal on AD2 and AD3 pin, and AD2 sampled value is for judging signal threshold value, and AD3 sampled value is first
It is handled by rolling average algorithm, then uses Fourier transformation, signal is transformed into frequency domain from time domain, to obtain letter
Number frequency domain distribution, can be obtained by clean fetal heart rate signal in this way, compare between technology have very big improvement；And this hair
The bright rolling average algorithm used and Fourier transformation etc. also made positive contributions for filtering interference signals；
Therefore, the present invention realizes movement of the foetus and fetal rhythm acquisition and detection using piezoelectric transducer technology, will not to parent and
Fetus causes to radiate, and can remove the signal that pregnant woman's gurgling sound, abdomen blood flow sound etc. can interfere fetal rhythm and movement of the foetus, simultaneously
Detect more accurate fetal rhythm and Fetal Movement Signal, application value with higher.
Claims (8)
1. a kind of fetus movement of the foetus fetal heart rate signal monitors system, which is characterized in that including CPU, be connected with monitoring unit and use on CPU
In the power module of power supply；Monitoring unit mainly includes movement of the foetus observation circuit and fetal rhythm observation circuit, and movement of the foetus observation circuit includes
Sequentially connected piezoelectric transducer module, amplification filter module, bandpass filtering modules block, bandpass filtering modules block are directly connected to CPU's
AD1 pin is also connected with comparator module and level switch module in turn after bandpass filtering modules block, and level switch module is connected to
The external interrupt pin of CPU；Fetal rhythm observation circuit includes piezoelectric transducer module identical with movement of the foetus observation circuit structure, amplification
Filter module and bandpass filtering modules block；After piezoelectric transducer module, amplification filter module and bandpass filtering modules block are sequentially connected, band
Pass filtering module is directly connected to the AD2 pin of CPU, and trapper module is also connected with after bandpass filtering modules block, and trapper module connects
In the AD3 pin of CPU, at least provided with one group, all monitoring unit are disposed adjacent around little Bai dot monitoring unit, power supply mould
Block uses USB or battery powered mode, and CPU is equipped with USB interface and battery interface, and USB interface is connected to USB 5V direct current
Source.
2. a kind of fetus movement of the foetus fetal heart rate signal as described in claim 1 monitors system, which is characterized in that monitoring unit array
Arrangement, in the horizontal direction, centered on little Bai dot, spaced set；In vertical direction, centered on little Bai dot,
Spaced set.
3. a kind of fetus movement of the foetus fetal heart rate signal as claimed in claim 2 monitors system, which is characterized in that in the horizontal direction,
The spacing of adjacent monitoring unit is 5CM；In vertical direction, the spacing of adjacent monitoring unit is 4CM.
4. a kind of fetus movement of the foetus fetal heart rate signal monitoring method, which is characterized in that include the following steps：
Step 1：Each monitoring unit is divided to two branch acquisition movement of the foetus fetal rhythm original signals, and amplifies filtering respectively, then lead to
It crosses bandpass filtering and obtains Fetal Movement Signal and fetal heart rate signal；
Step 2：In first branch, comparator is passed through by the Fetal Movement Signal obtained after bandpass filtering again and level translator sieves
Select clean Fetal Movement Signal；
In Article 2 branch, trapper is passed through by the fetal heart rate signal obtained after bandpass filtering again and filters out clean fetal heart rate signal；
Step 3：In first branch, CPU opens external interrupt, waits external interrupt to generate, by comparator and level translator
The Fetal Movement Signal obtained after screening passes through the external interrupt pin that CPU is sent into the channel INT again, by the movement of the foetus obtained after bandpass filtering
Signal is sent into the AD1 pin of CPU by the channel ADIN1, in conjunction with analog signal sampling and movement of the foetus monitoring algorithm, obtains fetus
Movement of the foetus intensity；
In Article 2 branch, carried out by the fetal heart rate signal obtained after bandpass filtering by the AD2 pin that CPU is sent into the channel ADIN2
Digital sample, then the fetal heart rate signal obtained after being screened by trapper pass through the AD3 pin that CPU is sent into the channel ADIN3, in conjunction with mould
Quasi- signal sampling and fetal rhythm monitoring algorithm, obtain the palmic rate of fetus.
5. a kind of fetus movement of the foetus fetal heart rate signal monitoring method as claimed in claim 4, which is characterized in that
In first branch, it is in conjunction with analog signal sampling and the specific processing mode of movement of the foetus monitoring algorithm：
1) the input sample window size in the channel ADIN1 is arranged in；
2) opens the input sample function in the channel ADIN1；
3) opens the external interrupt of CPU；
4) waits movement of the foetus interrupt signal, and judges whether to generate external interrupt；
5) closes external interrupt when there is external interrupt generation；Otherwise operation 4) is continued to execute；
6) after closes external interrupt, the movement that ADIN1 channel sample signal when interrupting generation is calculated using rolling average algorithm is flat
Mean value, and judge whether the moving average of ADIN1 channel sample signal is greater than normal Fetal Movement Signal threshold value；
7) generates a movement of the foetus, and shake rails fatigue resistance if moving average is greater than normal Fetal Movement Signal threshold value；Otherwise after
The continuous operation executed 4).
6. a kind of fetus movement of the foetus fetal heart rate signal monitoring method as claimed in claim 4, which is characterized in that in Article 2 branch,
It is in conjunction with analog signal sampling and the specific processing mode of fetal rhythm monitoring algorithm：
1) the sampling window size in the channel ADIN2, the channel ADIN3 is arranged in；
2) opens the input sample function in the channel ADIN2, the channel ADIN3；
3) is successively sampled the sampled signal size in every road monitoring channel by sample frequency, and judges whether to reach sampling window；
4) calculates the movement for interrupting ADIN2 channel sample signal when generating using rolling average algorithm when reaching sampling window
Average value, then judge whether the moving average of ADIN2 channel sample signal is greater than normal fetal heart rate signal threshold value；
5) is monitored when the moving average of ADIN2 channel sample signal is greater than normal fetal heart rate signal threshold value further according to movement of the foetus
Algorithm judges in epicycle sampling window with the presence or absence of effective Fetal Movement Signal；Otherwise, continue operation 3)；
6) carries out the sampled data in the channel ADIN2, ADIN3 when effective Fetal Movement Signal is not present in epicycle sampling window
Fast Fourier Transform (FFT), to obtain the frequency characteristic of sampled signal；Otherwise, continue operation 3)；
7) adds up the amplitude of the identical frequency component in the channel ADIN2, the channel ADIN3；
8) corresponding frequency of frequency component according to obtained in sampling window calculating 7)；
9) records the frequency being calculated in 8), this frequency is the palmic rate of fetus.
7. such as a kind of described in any item fetus movement of the foetus fetal heart rate signal monitoring methods of claim 5,6, which is characterized in that mobile flat
Equal algorithm is：
1) assumes that the window size of sample space is N, and moving window is equal to W, wherein N>=W, every W point calculate primary sampling
The signal amplitude that the average value of signal is sampled as this；
2) then. acquires a point of new W ' instead of most starting W point of acquisition in sample space again, and calculates its average value conduct
The signal amplitude of next round sampling, and so on.
8. a kind of fetus movement of the foetus fetal heart rate signal monitoring method as claimed in claim 6, which is characterized in that Fast Fourier Transform (FFT)
Algorithm is：
1) provides array A1(N), A2(N) and ω (N/2)；
2) is by the plural array { x of known recordkIt is input to unit A1(k) in, the value of k is 0 to N-1；
3) calculates ωm=exp (- i2 π m/N) is stored in unit ω (m), and the value of m is 0 to (N/2) -1；
4) 6) .q circulation, if q is 5) odd number executes, is otherwise executed from 1 to p；
5) .k circulation is from 0 to 2p-q-1, j circulation is from 0 to 2p-1- 1, it calculates
A2(k2q+ j)=A1(k2q-1+j)+A1(k2q-1+j+2p-1)
A2(k2q+j+2q-1)=[A1(k2q-1+j)-A2(k2q-1+j+2q-1)]ω(k2q-1) execute 7)；
6) .k circulation is from 0 to 2p-q- 1, j are recycled from 0 to 2q-1, calculate
A1(k2q+ j)=A2(k2q-1+j)+A2(k2q-1+j+2p-1)
A1(k2q+j+2q-1)=[A2(k2q-1+j)-A2(k2q-1+j+2q-1)]ω(k2q-1)
K, j circulation terminate, and perform the next step；
7) 8) if. q=p is executed, otherwise 4) q+1 → q is executed；
8) .q circulation terminates, if p=even number, by A1(j)→A2(j), then cj=A2(j) (j=0,1,2 ... N-1) is required.
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|---|---|---|---|---|
| CN1148989A (en) * | 1995-10-25 | 1997-05-07 | 李晓森 | Computer apparatus for monitoring childbirth and analgesia |
| CN202078299U (en) * | 2011-04-27 | 2011-12-21 | 北京工业大学 | Array-type quickening signal and uterine contraction signal monitoring abdominal belt |
| CN102370496A (en) * | 2011-09-09 | 2012-03-14 | 北京大学深圳研究生院 | Fetal heart sound monitoring instrument based on piezoelectric thin-film sensor |
| CN104224226A (en) * | 2014-06-03 | 2014-12-24 | 甘欣悦 | Fetal heart sound and uterine contraction signal integrated sensor module |
| CN204971268U (en) * | 2015-07-20 | 2016-01-20 | 四川世鼎电子科技有限公司 | Foetus fetal movement child heart signal monitoring system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1148989A (en) * | 1995-10-25 | 1997-05-07 | 李晓森 | Computer apparatus for monitoring childbirth and analgesia |
| CN202078299U (en) * | 2011-04-27 | 2011-12-21 | 北京工业大学 | Array-type quickening signal and uterine contraction signal monitoring abdominal belt |
| CN102370496A (en) * | 2011-09-09 | 2012-03-14 | 北京大学深圳研究生院 | Fetal heart sound monitoring instrument based on piezoelectric thin-film sensor |
| CN104224226A (en) * | 2014-06-03 | 2014-12-24 | 甘欣悦 | Fetal heart sound and uterine contraction signal integrated sensor module |
| CN204971268U (en) * | 2015-07-20 | 2016-01-20 | 四川世鼎电子科技有限公司 | Foetus fetal movement child heart signal monitoring system |
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