CN105105742A - System and method of monitoring fetal movement and fetal heart signals of fetal - Google Patents
System and method of monitoring fetal movement and fetal heart signals of fetal Download PDFInfo
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- CN105105742A CN105105742A CN201510427488.0A CN201510427488A CN105105742A CN 105105742 A CN105105742 A CN 105105742A CN 201510427488 A CN201510427488 A CN 201510427488A CN 105105742 A CN105105742 A CN 105105742A
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Abstract
The invention discloses a system and a method of monitoring fetal movement and fetal heart signals of a fetal. The system comprises a CPU (Central Processing Unit), wherein the CPU is connected with a monitoring unit and a power supply module which is used for supplying power; the monitoring unit performs acquisition and filtration by adopting a fetal movement monitoring circuit and a fetal heart monitoring circuit to obtain a fetal movement signal and a fetal heart signal; the fetal movement signal is subjected to digital sampling through a pin AD1 of the CPU; the fetal heart signal is directly connected to a pin AD2 of the CPU after passing through a band-pass filter module in the fetal movement monitoring circuit, is also connected to a pin AD3 of the CPU through a trap filter module in the fetal movement monitoring circuit and is subjected to digital sampling, so that the power frequency interference of a human body is filtered, and clean fetal heart signal is obtained. According to the system and the method, the fetal movement and the fetal heart signal are acquired and detected by adopting a piezoelectric sensor technology; the body of the mother and the fetal cannot be radiated; the interference signals for the fetal heart signal and the fetal movement caused by intestinal sounds, abdominal blood flow sound and the like of a pregnant woman can be removed; meanwhile, the more accurate fetal heart signal and fetal movement signals can be detected; the system and the method have higher application value.
Description
Technical field
The invention belongs to medicine and hygiene fields, especially design the system and method for a kind of fetal rhythm for fetus and Fetal Movement Signal monitoring.
Background technology
Anemia of pregnant woman is in the whole pregnancy period except needs regularly check UP to special hospital, and that also wants variable interval carries out various self-inspection.In various self-inspection project, measure the fetal rhythm of fetus and fetal movement is the important indicator judging fetal vital sign, from pregnant in early days every day all needs the fetal rhythm to fetus, fetal movement checks, to grasp the growth promoter situation of fetus at any time.Particularly some advanced ages, high risk gravida, every day may need self-inspection repeatedly, and records result of testing oneself.
Because fetal rhythm and Fetal Movement Signal fainter, and anemia of pregnant woman's borborygmus, abdominal part blood flow sound etc. can cause interference to the heart beating of fetus and Fetal Movement Signal, the fetal rhythm that unitem is just carried out in the current detection for the fetal movement of fetus fetal rhythm detects or fetal movement detection, can not carry out detecting and fetal rhythm detects or fetal movement detects and is inaccurate simultaneously, fault rate is high, therefore, present fetal rhythm and fetal movement detection technique can not meet current needs.
Summary of the invention
The object of this invention is to provide a kind of fetus fetal movement fetal heart rate signal monitoring system and method, piezoelectric transducer technology is adopted to realize fetal movement and fetal rhythm collection and detection, radiation can not be caused to parent and fetus, anemia of pregnant woman's borborygmus, abdominal part blood flow sound etc. can cause interference signal to fetal rhythm and fetal movement can be removed, detect more accurately fetal rhythm and Fetal Movement Signal simultaneously.
For achieving the above object, the present invention takes following technical scheme to be achieved:
Power module, for powering to whole system;
Piezoelectric transducer module, for gathering the fetal movement fetal rhythm primary signal of fetus;
Amplification filtering module, the fetal movement fetal rhythm primary signal for receiving carries out amplification and filtering (first time filtering);
Bandpass filtering modules block, for filtering interfering signal, obtains the fetal movement fetal heart rate signal needed;
Processing and control module, i.e. CPU, for carrying out digital sample respectively to fetal movement and fetal heart rate signal;
Comparator module, for filtering out Fetal Movement Signal;
Level switch module, for the electrical characteristic of matching detection signal and CPU pin;
Wave trap module, for filtering out the Hz noise of human body, obtains fetal heart rate signal;
CPU is connected with monitoring means and the power module for powering; Monitoring means mainly comprises fetal movement observation circuit and fetal rhythm observation circuit, fetal movement observation circuit comprises the piezoelectric transducer module, amplification filtering module, the bandpass filtering modules block that connect successively, bandpass filtering modules block is directly connected to the AD1 pin of CPU, also be connected with comparator module and level switch module in turn after bandpass filtering modules block, level switch module is connected to the external interrupt pin of CPU; Fetal rhythm observation circuit comprises the piezoelectric transducer module identical with fetal movement observation circuit structure, amplification filtering module and bandpass filtering modules block; After piezoelectric transducer module, amplification filtering module are connected successively with bandpass filtering modules block, bandpass filtering modules block is directly connected to the AD2 pin of CPU, is also connected with wave trap module after bandpass filtering modules block, and wave trap module is connected to the AD3 pin of CPU.
Further, monitoring means is at least provided with one group, and all monitoring means are disposed adjacent around little Bai round dot.
Further, monitoring means array is arranged, in the horizontal direction, centered by little Bai round dot, and spaced set; In vertical direction, centered by little Bai round dot, spaced set.
Further, in the horizontal direction, the spacing of adjacent monitoring means is 5CM; In vertical direction, the spacing of adjacent monitoring means is 4CM.
Further, power module adopts USB or battery powered mode, and processing and control module is provided with USB interface and battery interface, and USB interface is connected to USB5V DC source.
A kind of fetus fetal movement fetal heart rate signal monitoring method, comprises the following steps:
Step one: each monitoring means divides two branch roads to gather fetal movement fetal rhythm primary signal, and carries out amplification filtering respectively, then obtains Fetal Movement Signal and fetal heart rate signal by bandpass filtering;
Step 2: in Article 1 branch road, filters out clean Fetal Movement Signal by comparator and level translator again by the Fetal Movement Signal obtained after bandpass filtering;
In Article 2 branch road, filter out clean fetal heart rate signal by wave trap again by the fetal heart rate signal obtained after bandpass filtering;
Step 3: in Article 1 branch road, CPU opens external interrupt, wait external interrupt produces, the Fetal Movement Signal obtained after being screened by comparator and level translator sends into the external interrupt pin of CPU again by INT passage, sent into the AD1 pin of CPU by ADIN1 passage by the Fetal Movement Signal obtained after bandpass filtering, again in conjunction with analogue signal sampling and fetal movement monitoring algorithm, obtain the fetal movement intensity of fetus;
In Article 2 branch road, the AD2 pin sending into CPU by ADIN2 passage by the fetal heart rate signal obtained after bandpass filtering carries out digital sample, the fetal heart rate signal obtained after being screened by wave trap again sends into the AD3 pin of CPU by ADIN3 passage, again in conjunction with analogue signal sampling and fetal rhythm monitoring algorithm, obtain the palmic rate of fetus.
Concrete, in Article 1 branch road, the concrete processing mode of carrying out digital sample in conjunction with fetal movement monitoring algorithm is:
1). the input sample window size of ADIN1 passage is set;
2). open the input sample function of ADIN1 passage;
3). open the external interrupt of CPU;
4). wait for fetal movement interrupt signal, and judge whether to produce external interrupt;
5). when there being external interrupt to produce, close external interrupt; Otherwise continue execution 4) operation;
6). after closing external interrupt, adopt rolling average algorithm to calculate the moving average of ADIN1 channel sample signal when interrupting generation, and judge whether the moving average of ADIN1 channel sample signal is greater than normal Fetal Movement Signal threshold value;
7) if. moving average is greater than normal Fetal Movement Signal threshold value, produces a fetal movement, and shake rails fatigue resistance; Otherwise continue execution 4) operation.
Concrete, in Article 2 branch road, the concrete processing mode of carrying out digital sample in conjunction with fetal rhythm monitoring algorithm is:
1). the sampling window size of ADIN2 passage, ADIN3 passage is set;
2). open the input sample function of ADIN2 passage, ADIN3 passage;
3). the sampled signal size of every road monitoring channel of sampling successively by sample frequency, and judge whether to arrive sampling window;
4). when arriving sampling window, adopting rolling average algorithm to calculate the moving average of ADIN2 channel sample signal when interrupting generation, then judging whether the moving average of ADIN2 channel sample signal is greater than normal fetal heart rate signal threshold value;
5). when the moving average of ADIN2 channel sample signal is greater than normal fetal heart rate signal threshold value, then judge whether there is effective Fetal Movement Signal in epicycle sampling window according to fetal movement monitoring algorithm; Otherwise, proceed 3) operation;
6). when there is not effective Fetal Movement Signal in epicycle sampling window, fast Fourier transform being carried out to the sampled data of ADIN2, ADIN3 passage, thus obtains the frequency characteristic of sampled signal; Otherwise, proceed 3) operation;
7). the amplitude of the same frequency component of ADIN2 passage, ADIN3 passage is added up;
8). calculate 7 according to sampling window) in frequency corresponding to the frequency component that obtains;
9). record 8) in the frequency that calculates, this frequency is the palmic rate of fetus.
Rolling average algorithm is:
1). the window size supposing sample space is N, and moving window equals W, wherein N>=W, the signal amplitude that the meansigma methods of an every W some calculating sampled signal is sampled as this;
2). and then gather W the point that the individual point of new W ' replaces starting most in sample space to gather, and calculate the signal amplitude that its meansigma methods samples as next round, by that analogy.
Fast fourier transform algorithm is:
1). provide array A
1(N), A
2and ω (N/2) (N);
2). by known record plural number array { x
kbe input to unit A
1in (k) (k is from 0 to N-1);
3). calculate ω
m=exp (-i2 π m/N) leaves (m is from 0 to (N/2)-1) in unit ω (m) in;
4) .q circulation is from 1 to p, if q is odd number perform 5), otherwise perform 6);
5) .k circulation is from 0 to 2
p-q-1, j circulation is from 0 to 2
p-1-1, calculate
A
2(k2
q+j)＝A
1(k2
q-1+j)+A
1(k2
q-1+j+2
p-1)
A
2(k2
q+j+2
q-1)＝[A
1(k2
q-1+j)-A
2(k2
q-1+j+2
q-1)]ω(k2
q-1)
Perform 7);
6) .k circulation is from 0 to 2
p-q-1, j circulation is from 0 to 2
q-1, calculate
A
1(k2
q+j)＝A
2(k2
q-1+j)+A
2(k2
q-1+j+2
p-1)
A
1(k2
q+j+2
q-1)＝[A
2(k2
q-1+j)-A
2(k2
q-1+j+2
q-1)]ω(k2
q-1)
K, j loop ends, performs next step;
7) if. q=p perform 8), otherwise q+1 → q perform 4);
8) .q loop ends, if p=even number, by A
1(j) → A
2(j), then c
j=A
2(j) (j=0,1,2 ... N-1) required by being.
Compared with prior art, the present invention has following beneficial effect:
Monitoring means of the present invention adopts fetal movement observation circuit and fetal rhythm observation circuit (point two-way) to gather fetal movement fetal rhythm primary signal respectively, again the fetal movement fetal rhythm primary signal collected is screened respectively, filter out the interfering signal such as anemia of pregnant woman's borborygmus, abdominal part blood flow sound, reach the object simultaneously gathering Fetal Movement Signal and fetal heart rate signal; And wherein, fetal movement observation circuit is by being connected to the external interrupt of CPU again after being connected successively with level switch module by piezoelectric transducer module, amplification filtering module, bandpass filtering modules block, comparator module, again by being directly connected to the AD1 pin of CPU after bandpass filtering modules block and the sampling branch road formed, reduce the erroneous judgement that external disturbance is brought, improve the accuracy of detection of Fetal Movement Signal, technology before comparing, Fetal Movement Signal of the present invention is cleaner, more accurately; Fetal rhythm observation circuit is by after being connected piezoelectric transducer module, amplification filtering module successively with bandpass filtering modules block, also be provided with the AD2 pin being directly connected to CPU after bandpass filtering modules block and the sampling branch road formed, after bandpass filtering modules block, be connected to again the AD3 pin of CPU by wave trap module; Wherein, the effect of wave trap is the Hz noise filtering out human body, CPU samples to the input signal on AD2 and AD3 pin, AD2 sampled value is for judging signal threshold value, and first AD3 sampled value processes through rolling average algorithm, then adopts Fourier transformation, signal is transformed into frequency domain from time domain, thus obtain the frequency domain distribution of signal, so just can obtain clean fetal heart rate signal, the technology between comparing has had very large improvement; And the rolling average algorithm that the present invention adopts and Fourier transformation etc. are also for filtering interference signals has made positive contribution; Therefore, the present invention adopts piezoelectric transducer technology to realize fetal movement and fetal rhythm collection and detection, radiation can not be caused to parent and fetus, anemia of pregnant woman's borborygmus, abdominal part blood flow sound etc. can cause interference signal to fetal rhythm and fetal movement can be removed, detect more accurately fetal rhythm and Fetal Movement Signal simultaneously, there is higher using value.
Accompanying drawing explanation
Fig. 1 system structure schematic diagram of the present invention;
Fig. 2 monitoring means scattergram of the present invention;
Fig. 3 detection method schematic diagram of the present invention;
Fig. 4 fetal movement observation circuit of the present invention figure;
Fig. 5 fetal rhythm observation circuit of the present invention figure;
Fig. 6 fetal movement monitoring algorithm of the present invention schematic diagram;
Fig. 7 fetal rhythm monitoring algorithm of the present invention schematic diagram.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the invention are described.
The object of this invention is to provide a kind of fetus fetal movement fetal heart rate signal monitoring system and method, piezoelectric transducer technology is adopted to realize fetal movement and fetal rhythm collection and detection, radiation can not be caused to parent and fetus, anemia of pregnant woman's borborygmus, abdominal part blood flow sound etc. can cause interference signal to fetal rhythm and fetal movement can be removed, detect fetal rhythm and Fetal Movement Signal, and the fetal rhythm fetal movement inspection of fetus is more accurate simultaneously.
With reference to figure 1, a kind of fetus fetal movement fetal heart rate signal monitoring system, comprising:
Power module, for powering to whole system;
Piezoelectric transducer module, for gathering the fetal movement fetal rhythm primary signal of fetus;
Amplification filtering module, the fetal movement fetal rhythm primary signal for receiving carries out amplification and filtering (first time filtering);
Bandpass filtering modules block, for filtering interfering signal, obtains the fetal movement fetal heart rate signal needed;
Processing and control module, i.e. CPU, for carrying out digital sample respectively to fetal movement and fetal heart rate signal;
Comparator module, for filtering out Fetal Movement Signal;
Level switch module, for the electrical characteristic of matching detection signal and CPU pin;
Wave trap module, for filtering out the Hz noise of human body, obtains fetal heart rate signal;
With reference to figure 1, the concrete structure of this monitoring system is:
Comprise processing and control module, processing and control module is the power module that CPU, CPU are connected with for powering, the mode that power module adopts USB to power, and processing and control module is provided with USB interface, and USB interface is connected to 5V DC source; CPU is also connected with monitoring means; Monitoring means is provided with some groups, determines according to the quantity of monitoring means; Each group monitoring means mainly comprises fetal movement observation circuit and fetal rhythm observation circuit; Wherein fetal movement observation circuit comprises the piezoelectric transducer module, amplification filtering module, the bandpass filtering modules block that connect successively, bandpass filtering modules block is directly connected to the AD1 pin (the first high-precision AD Sampling Interface) of CPU, comparator module and level switch module is also connected with in turn after bandpass filtering modules block, level switch module is connected to the I/O pin of CPU, and this I/O pin is the external interrupt pin of software arrangements; Fetal rhythm observation circuit comprises piezoelectric transducer module, amplification filtering module and the bandpass filtering modules block of identical from fetal movement observation circuit structure (but the parameter of components and parts is different); After piezoelectric transducer module, amplification filtering module are connected successively with bandpass filtering modules block, also the AD2 pin (the second high-precision AD Sampling Interface) that is directly connected to CPU is provided with and the sampling branch road that forms after bandpass filtering modules block, also be connected with wave trap module after bandpass filtering modules block, wave trap module is connected to the AD3 pin (third high Precision A/D Sampling Interface) of CPU.
The piezoelectric transducer module of the present embodiment adopts HKY-06 type piezoelectric transducer to gather the fetal rhythm fetal movement primary signal of fetus, acquired signal frequency range is 0 ~ 600HZ, amplitude output signal 0.5 ~ 1V, HKY-06 type piezoelectric transducer can detect small vibrations, and the pressure signal that vibrations are formed is converted to the corresponding signal of telecommunication, its advantage is, radiationless, bandwidth, highly sensitive.
Due to fetus meeting persistent movement in parent, its cardiac position also can constantly change, and different with the strong position of uterine contraction signal in difference trimester of pregnancy Fetal Movement Signal.In order to more accurate during signal extraction, the layout of each monitoring means of the present embodiment as shown in Figure 2, arrange, each little bullet is the monitoring means that structure is identical, centered by little Bai round dot (i.e. anemia of pregnant woman's umbilicus) by monitoring means array; In the horizontal direction, being provided with little Bai dot spacing is the little bullet of 5CM, is also 5CM adjacent to the little bullet spacing on the little bullet of little Bai round dot and other horizontal directions; In vertical direction, being provided with little Bai dot spacing is the little bullet of 4CM, is also 4CM adjacent to the little bullet spacing on the little bullet of little Bai round dot and other vertical direction; By above setting, native system can from the fetal movement of multi pass acquisition anemia of pregnant woman foetus and fetal heart rate signal, simultaneously, each monitoring means can process fetal movement and the fetal heart rate signal of respective position simultaneously, after handling well, deliver to high-precision AD Sampling Interface respective on CPU respectively and carry out digital sample.
Concrete, the fetal movement observation circuit figure of each monitoring means, as shown in Figure 4: SENSOR is the fetal movement fetal rhythm primary signal that piezoelectric transducer exports, the signal output part of the piezoelectric transducer of fetal movement observation circuit is connected with electric capacity C1, the negative pole of electric capacity C1 is connected with operational amplifier U1A, the negative pole of electric capacity C1 is connected to the in-phase input end of operational amplifier U1A, and the negative pole of electric capacity C1 is also connected with and is connected to the resistance R1 of 5V voltage and the resistance R2 of ground connection; The inverting input of operational amplifier U1A is connected with resistance R3 and electric capacity C2 in turn, the minus earth of electric capacity C2; The inverting input of operational amplifier U1A is also connected with the adjustable resistance R4 (slide rheostat) of size, and the negative pole of resistance R4 is connected to the signal output part of operational amplifier U1A; The power end of operational amplifier U1A is connected to 5V voltage, the earth terminal ground connection of operational amplifier U1A;------------→ be amplification filtering module herein
The signal output part of operational amplifier U1A is connected with resistance R5, and the negative pole of resistance R5 is connected with electric capacity C3 and operational amplifier U2A in turn, and electric capacity C3 is connected to the inverting input of operational amplifier U2A; The negative pole of resistance R5 is also connected with resistance R6, resistance R6 ground connection; The in-phase input end of operational amplifier U2A is connected with resistance R8, and resistance R8 is connected to 5V voltage; The in-phase input end of operational amplifier U2A is also connected with resistance R9, resistance R9 ground connection; The signal output part of operational amplifier U2A is connected with electric capacity C4, and the negative pole of electric capacity C4 is connected to the positive pole of electric capacity C3; The outfan of operational amplifier U2A is also connected with resistance R7, and the other end of resistance R7 is connected to the inverting input of operational amplifier U2A; The power end of operational amplifier U2A is connected to 5V voltage, the earth terminal ground connection of operational amplifier U2A; As shown in Figure 1, the signal output part (ADIN1) of operational amplifier U2A is connected to the AD1 pin of CPU;------------→ be bandpass filtering modules block herein
The signal output part (ADIN1) of operational amplifier U2A is connected with operational amplifier U3A, and operational amplifier U2A is connected to the in-phase input end of operational amplifier U3A; The reverse phase input of operational amplifier U3A is connected with the adjustable resistance R10 (slide rheostat) of size, and the other end of resistance R10 is connected to 5V voltage; The inverting input 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 earth terminal ground connection of operational amplifier U3A;------------→ be comparator module herein
The signal output part of operational amplifier U3A is connected with resistance R12, and the other end of resistance R12 is connected with the audion Q1 of NPN type, and resistance R12 is connected to the base stage of audion Q1, the grounded emitter of audion Q1; The colelctor electrode of audion Q1 is connected with resistance R13, resistance R14 and resistance R15 in turn, resistance R15 ground connection; The colelctor electrode of audion Q1 is also connected with audion Q2, and the colelctor electrode of audion Q1 is connected to the base stage of audion Q2, the grounded emitter of audion Q2; The colelctor electrode (INT) of audion Q2 is connected with resistance R16, and resistance R16 is connected to the common port of resistance R14 and resistance R15; As shown in Figure 1, the colelctor electrode (INT) of audion Q2 is connected to the I/O pin (this I/O pin is the external interrupt of CPU) of CPU;------------→ be level switch module herein
The fetal rhythm observation circuit figure of each monitoring means, (Fig. 4 and Fig. 5 is different circuit diagram as shown in Figure 5, the identical components and parts of label are in respective circuit, be independent of each other): SENSOR is the fetal movement fetal rhythm primary signal that piezoelectric transducer exports, the signal output part of the piezoelectric transducer of fetal movement observation circuit is connected with electric capacity C1, the negative pole of electric capacity C1 is connected with operational amplifier U1A, the negative pole of electric capacity C1 is connected to the in-phase input end of operational amplifier U1A, and the negative pole of electric capacity C1 is also connected with and is connected to the resistance R1 of 5V voltage and the resistance R2 of ground connection; The inverting input of operational amplifier U1A is connected with resistance R3 and electric capacity C2 in turn, the minus earth of electric capacity C2; The inverting input of operational amplifier U1A is also connected with the adjustable resistance R4 (slide rheostat) of size, and the negative pole of resistance R4 is connected to the signal output part of operational amplifier U1A; The power end of operational amplifier U1A is connected to 5V voltage, the earth terminal ground connection of operational amplifier U1A;------------→ be amplification filtering module herein
The signal output part of operational amplifier U1A is connected with resistance R5, and the negative pole of resistance R5 is connected with electric capacity C3 and operational amplifier U2A in turn, and electric capacity C3 is connected to the inverting input of operational amplifier U2A; The negative pole of resistance R5 is also connected with resistance R6, resistance R6 ground connection; The in-phase input end of operational amplifier U2A is connected with resistance R8, and resistance R8 is connected to 5V voltage; The in-phase input end of operational amplifier U2A is also connected with resistance R9, resistance R9 ground connection; The signal output part of operational amplifier U2A is connected with electric capacity C4, and the negative pole of electric capacity C4 is connected to the positive pole of electric capacity C3; The outfan of operational amplifier U2A is also connected with resistance R7, and the other end of resistance R7 is connected to the inverting input of operational amplifier U2A; The power end of operational amplifier U2A is connected to 5V voltage, the earth terminal ground connection of operational amplifier U2A; As shown in Figure 1, the signal output part (ADIN2) of operational amplifier U2A is connected to the AD2 pin of CPU;------------→ be bandpass filtering modules block herein
The signal output part of operational amplifier U2A is connected with electric capacity R5, and the negative pole of electric capacity R5 is connected with resistance R10 and resistance R11 in turn, and the negative pole of electric capacity R5 is also connected with electric capacity C6 and electric capacity C7 in turn, and the negative pole of resistance R11 and electric capacity C7 is connected with operational amplifier U3A; The negative pole of resistance R11 and electric capacity C7 is connected to the inverting input of operational amplifier U3A; The common port of resistance R10 and resistance R11 is connected with electric capacity C8, electric capacity C8 ground connection; The common port of electric capacity C6 and electric capacity C7 is connected with resistance R12, resistance R12 ground connection; The in-phase input end of operational amplifier U3A is connected with resistance R13, resistance R13 ground connection; The power end of operational amplifier U3A is connected to 5V voltage, the earth terminal ground connection of operational amplifier U3A; The signal output part (ADIN3) of operational amplifier U3A is connected with resistance R14, and resistance R14 is connected to the common port of the in-phase input end of resistance R13 and operational amplifier U3A; As shown in Figure 1, the signal output part (ADIN3) of operational amplifier U3A is connected to the AD3 pin of CPU.------------→ be bandpass filtering modules block herein
As shown in Figure 3, a kind of fetus fetal movement fetal heart rate signal monitoring method, comprises the following steps:
Step one: each monitoring means divides two branch roads to gather fetal movement fetal rhythm primary signal, and carries out amplification filtering respectively, then obtains Fetal Movement Signal and fetal heart rate signal by bandpass filtering;
Step 2: in Article 1 branch road, filters out clean Fetal Movement Signal by comparator and level translator again by the Fetal Movement Signal obtained after bandpass filtering;
In Article 2 branch road, filter out clean fetal heart rate signal by wave trap again by the fetal heart rate signal obtained after bandpass filtering;
Step 3: in Article 1 branch road, CPU opens external interrupt, wait external interrupt produces, the Fetal Movement Signal obtained after being screened by comparator and level translator sends into the external interrupt pin of CPU again by INT passage, sent into the AD1 pin of CPU by ADIN1 passage by the Fetal Movement Signal obtained after bandpass filtering, again in conjunction with analogue signal sampling and fetal movement monitoring algorithm, obtain the fetal movement intensity of fetus;
In Article 2 branch road, the AD2 pin sending into CPU by ADIN2 passage by the fetal heart rate signal obtained after bandpass filtering carries out digital sample, the fetal heart rate signal obtained after being screened by wave trap again sends into the AD3 pin of CPU by ADIN3 passage, again in conjunction with analogue signal sampling and fetal rhythm monitoring algorithm, obtain the palmic rate of fetus.
After sending into the high-precision AD Sampling Interface of CPU by the Fetal Movement Signal obtained after bandpass filtering, adopt rolling average algorithm to carry out digital sample, the basic method of sampling is:
1). the window size supposing sample space is N, and moving window equals W, wherein N>=W, the signal amplitude that the meansigma methods of an every W some calculating sampled signal is sampled as this;
2). and then gather W the point that the individual point of new W ' replaces starting most in sample space to gather, and calculate the signal amplitude that its meansigma methods samples as next round, by that analogy.
As shown in Fig. 1,4,6, select suitable hardware parameter, effective Fetal Movement Signal exports effective low level signal through circuit transformations at INT passage, thus triggers the external interrupt of CPU, and the external interrupt of CPU is triggered, and is designated as a fetal movement; In order to reduce the erroneous judgement that external disturbance is brought, software is sampled the magnitude of voltage of ADIN1 passage simultaneously, the i.e. numerical value of Fetal Movement Signal through piezoelectric transduction (piezoelectric transducer module) and after amplification filtering (bandpass filtering), specific algorithm as shown in Figure 5:
Article 1, in branch road, the concrete processing mode of carrying out digital sample in conjunction with fetal movement monitoring algorithm is:
1). the input sample window size of ADIN1 passage is set;
2). open the input sample function of ADIN1 passage;
3). open the external interrupt of CPU;
4). wait for fetal movement interrupt signal, and judge whether to produce external interrupt;
5). when there being external interrupt to produce, close external interrupt; Otherwise continue execution 4) operation;
6). after closing external interrupt, adopt rolling average algorithm to calculate the moving average of ADIN1 channel sample signal when interrupting generation, and judge whether the moving average of ADIN1 channel sample signal is greater than normal Fetal Movement Signal threshold value;
7) if. moving average is greater than normal Fetal Movement Signal threshold value, produces a fetal movement, and shake rails fatigue resistance; Otherwise continue execution 4) operation.
As shown in Figure 1 and Figure 7, the frequency of wave trap is 50HZ, and its effect is exactly that the Hz noise filtering out human body obtains clean fetal heart rate signal, and CPU adopts the sample frequency of 10HZ to carry out digital sample to the input signal on AD2 pin and AD3 pin; AD2 pin sampled value is for judging signal threshold value, first the sampled value of AD3 pin processes through rolling average algorithm (identical with Fetal Movement Signal), then adopt Fourier transformation, signal is transformed into frequency domain from time domain, thus obtain the frequency domain distribution of fetal heart rate signal; Meanwhile, fetal rhythm monitoring algorithm also will consider the interference that fetus fetal movement is monitored fetal rhythm.The specific algorithm of fetal rhythm monitoring algorithm is as shown in Figure 6:
In Article 2 branch road, the concrete processing mode of carrying out digital sample in conjunction with fetal rhythm monitoring algorithm is:
1). the sampling window size of ADIN2 passage, ADIN3 passage is set;
2). open the input sample function of ADIN2 passage, ADIN3 passage;
3). the sampled signal size of every road monitoring channel of sampling successively by sample frequency, and judge whether to arrive sampling window;
4). when arriving sampling window, adopting rolling average algorithm to calculate the moving average of ADIN2 channel sample signal when interrupting generation, then judging whether the moving average of ADIN2 channel sample signal is greater than normal fetal heart rate signal threshold value;
5). when the moving average of ADIN2 channel sample signal is greater than normal fetal heart rate signal threshold value, then judge whether there is effective Fetal Movement Signal in epicycle sampling window according to fetal movement monitoring algorithm; Otherwise, proceed 3) operation;
6). when there is not effective Fetal Movement Signal in epicycle sampling window, fast Fourier transform being carried out to the sampled data of ADIN2, ADIN3 passage, thus obtains the frequency characteristic of sampled signal; Otherwise, proceed 3) operation;
7). the amplitude of the same frequency component of ADIN2 passage, ADIN3 passage is added up;
8). after amplitude is cumulative, the frequency component of record amplitude peak;
9). calculate 8 according to sampling window) in frequency corresponding to frequency component;
10). record 9) in the frequency that calculates, this frequency is the palmic rate of fetus.
In Article 2 branch road, above-mentioned steps 5) in carry out the concrete processing mode of digital sample in fetal movement monitoring algorithm and Article 1 branch road in conjunction with fetal movement monitoring algorithm.
In addition, concrete, fast fourier transform algorithm is:
1). provide array A
1(N), A
2and ω (N/2) (N);
2). by known record plural number array { x
kbe input to unit A
1in (k) (k is from 0 to N-1);
3). calculate ω
m=exp (-i2 π m/N) leaves (m is from 0 to (N/2)-1) in unit ω (m) in;
4) .q circulation is from 1 to p, if q is odd number perform 5), otherwise perform 6);
5) .k circulation is from 0 to 2
p-q-1, j circulation is from 0 to 2
p-1-1, calculate
A
2(k2
q+j)＝A
1(k2
q-1+j)+A
1(k2
q-1+j+2
p-1)
A
2(k2
q+j+2
q-1)＝[A
1(k2
q-1+j)-A
2(k2
q-1+j+2
q-1)]ω(k2
q-1)
Perform 7);
6) .k circulation is from 0 to 2
p-q-1, j circulation is from 0 to 2
q-1, calculate
A
1(k2
q+j)＝A
2(k2
q-1+j)+A
2(k2
q-1+j+2
p-1)
A
1(k2
q+j+2
q-1)＝[A
2(k2
q-1+j)-A
2(k2
q-1+j+2
q-1)]ω(k2
q-1)
K, j loop ends, performs next step;
7) if. q=p perform 8), otherwise q+1 → q perform 4);
8) .q loop ends, if p=even number, by A
1(j) → A
2(j), then c
j=A
2(j) (j=0,1,2 ... N-1) required by being.
Referring to Fig. 1 ~ 7, the invention will be further elaborated:
The extraction of fetal rhythm and Fetal Movement Signal adopts piezoelectric transducer, and piezoelectric transducer can detect small vibrations, and is converted to the corresponding signal of telecommunication, and its advantage is, radiationless, bandwidth, highly sensitive.Namely the extraction of fetal heartbeat and Fetal Movement Signal is the small vibrations adopting piezoelectric transducer to identify heart of fetus and limbs, and converts the pressure signal that vibrations are formed to the signal of telecommunication.
Due to fetal rhythm and Fetal Movement Signal fainter, and anemia of pregnant woman's borborygmus, abdominal part blood flow sound etc. can cause interference to the heart beating of fetus and Fetal Movement Signal, and the method that therefore the present invention adopts hardware and software to combine processes the signal that piezoelectric transducer collects.
Described AD1 pin, AD2 pin and AD3 pin are the high-precision AD Sampling Interface of CPU, fetal movement fetal rhythm primary signal carries the periodic signal of reaction fetal rhythm frequency, the approximate pulse signal of reaction fetal movement intensity and other high frequencies or low-frequency noise, fetal movement fetal rhythm primary signal is sent to amplification filtering module successively after the piezoelectric transducer module acquires of fetal movement observation circuit and bandpass filtering modules block carries out amplification filtering, the purer fetal movement fetal heart rate signal obtained after amplification filtering;
The AD1 pin that Fetal Movement Signal after amplification filtering is sent to CPU carries out digital sample.Through experiment, in fetal movement fetal rhythm primary signal, Fetal Movement Signal amplitude is maximum, general at more than 200mv, and the amplification of fetal movement observation circuit is as shown in Figure 4 about 11 times, if therefore there is the component of signal that amplitude is greater than 2V after digital sample, after the external interrupt pin closedown of CPU, if the meansigma methods of ADIN1 channel sample signal is greater than normality threshold, then produce a fetal movement, and record fetal movement time and intensity, what obtain after process like this is the pulse signal (Fetal Movement Signal) reflecting fetal movement 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; Simultaneously, the fetal heart rate signal obtained after amplification filtering is the sinusoidal signal of basic matching fetal heartbeat frequency again through sinusoidal signal (fetal heart rate signal) the filtered fetal heart rate signal of the clean reaction fetal rhythm frequency of the filtering of wave trap, so just obtains the sinusoidal signal carrying fetal rhythm frequency; The AD3 pin that filtered fetal heart rate signal through wave trap is sent to CPU carries out digital sample.
Fetal Movement Signal and fetal heart rate signal are carried out digital sample by the high-precision AD Sampling Interface delivering to CPU respectively.The fetal heart rate signal that sampling obtains, through rolling average algorithm, fast fourier transform, software frequency spectrum parser and signals revivification algorithm etc., obtains fetal heartbeat frequency and waveform; The amplitude of the Fetal Movement Signal obtained of sampling then reflects position and the intensity of fetus fetal movement.
In sum, monitoring means of the present invention adopts fetal movement observation circuit and fetal rhythm observation circuit to gather fetal movement fetal rhythm primary signal respectively, again the fetal movement fetal rhythm primary signal collected is screened respectively, filter out the interfering signal such as anemia of pregnant woman's borborygmus, abdominal part blood flow sound, reach the object simultaneously gathering Fetal Movement Signal and fetal heart rate signal; And wherein, fetal movement observation circuit is by being connected to the external interrupt of CPU again after being connected successively with level switch module by piezoelectric transducer module, amplification filtering module, bandpass filtering modules block, comparator module, again by being directly connected to the AD1 pin of CPU after bandpass filtering modules block and the sampling branch road formed, reduce the erroneous judgement that external disturbance is brought, improve the accuracy of detection of Fetal Movement Signal, technology before comparing, Fetal Movement Signal of the present invention is cleaner, more accurately; Fetal rhythm observation circuit is by after being connected piezoelectric transducer module, amplification filtering module successively with bandpass filtering modules block, also be provided with the AD2 pin being directly connected to CPU after bandpass filtering modules block and the sampling branch road formed, after bandpass filtering modules block, be connected to again the AD3 pin of CPU by wave trap module; Wherein, the effect of wave trap is the Hz noise filtering out human body, CPU samples to the input signal on AD2 and AD3 pin, AD2 sampled value is for judging signal threshold value, and first AD3 sampled value processes through rolling average algorithm, then adopts Fourier transformation, signal is transformed into frequency domain from time domain, thus obtain the frequency domain distribution of signal, so just can obtain clean fetal heart rate signal, the technology between comparing has had very large improvement; And the rolling average algorithm that the present invention adopts and Fourier transformation etc. are also for filtering interference signals has made positive contribution;
Therefore, the present invention adopts piezoelectric transducer technology to realize fetal movement and fetal rhythm collection and detection, radiation can not be caused to parent and fetus, anemia of pregnant woman's borborygmus, abdominal part blood flow sound etc. can cause interference signal to fetal rhythm and fetal movement can be removed, detect more accurately fetal rhythm and Fetal Movement Signal simultaneously, there is higher using value.
Claims (10)
1. a fetus fetal movement fetal heart rate signal monitoring system, is characterized in that, comprise CPU, CPU is connected with monitoring means and the power module for powering; Monitoring means mainly comprises fetal movement observation circuit and fetal rhythm observation circuit, fetal movement observation circuit comprises the piezoelectric transducer module, amplification filtering module, the bandpass filtering modules block that connect successively, bandpass filtering modules block is directly connected to the AD1 pin of CPU, also be connected with comparator module and level switch module in turn after bandpass filtering modules block, level switch module is connected to the external interrupt pin of CPU; Fetal rhythm observation circuit comprises the piezoelectric transducer module identical with fetal movement observation circuit structure, amplification filtering module and bandpass filtering modules block; After piezoelectric transducer module, amplification filtering module are connected successively with bandpass filtering modules block, bandpass filtering modules block is directly connected to the AD2 pin of CPU, is also connected with wave trap module after bandpass filtering modules block, and wave trap module is connected to the AD3 pin of CPU.
2. a kind of fetus fetal movement fetal heart rate signal monitoring system as claimed in claim 1, it is characterized in that, monitoring means is at least provided with one group, and all monitoring means are disposed adjacent around little Bai round dot.
3. a kind of fetus fetal movement fetal heart rate signal monitoring system as claimed in claim 2, is characterized in that, monitoring means array is arranged, in the horizontal direction, centered by little Bai round dot, and spaced set; In vertical direction, centered by little Bai round dot, spaced set.
4. a kind of fetus fetal movement fetal heart rate signal monitoring system as claimed in claim 3, is characterized in that, in the horizontal direction, the spacing of adjacent monitoring means is 5CM; In vertical direction, the spacing of adjacent monitoring means is 4CM.
5. a kind of fetus fetal movement fetal heart rate signal monitoring system as claimed in claim 1, is characterized in that, power module adopts USB or battery powered mode, and processing and control module is provided with USB interface and battery interface, and USB interface is connected to USB5V DC source.
6. a fetus fetal movement fetal heart rate signal monitoring method, is characterized in that, comprise the following steps:
Step one: each monitoring means divides two branch roads to gather fetal movement fetal rhythm primary signal, and carries out amplification filtering respectively, then obtains Fetal Movement Signal and fetal heart rate signal by bandpass filtering;
Step 2: in Article 1 branch road, filters out clean Fetal Movement Signal by comparator and level translator again by the Fetal Movement Signal obtained after bandpass filtering;
In Article 2 branch road, filter out clean fetal heart rate signal by wave trap again by the fetal heart rate signal obtained after bandpass filtering;
Step 3: in Article 1 branch road, CPU opens external interrupt, wait external interrupt produces, the Fetal Movement Signal obtained after being screened by comparator and level translator sends into the external interrupt pin of CPU again by INT passage, sent into the AD1 pin of CPU by ADIN1 passage by the Fetal Movement Signal obtained after bandpass filtering, again in conjunction with analogue signal sampling and fetal movement monitoring algorithm, obtain the fetal movement intensity of fetus;
In Article 2 branch road, the AD2 pin sending into CPU by ADIN2 passage by the fetal heart rate signal obtained after bandpass filtering carries out digital sample, the fetal heart rate signal obtained after being screened by wave trap again sends into the AD3 pin of CPU by ADIN3 passage, again in conjunction with analogue signal sampling and fetal rhythm monitoring algorithm, obtain the palmic rate of fetus.
7. a kind of fetus fetal movement fetal heart rate signal monitoring system as claimed in claim 6, is characterized in that,
Article 1, in branch road, in conjunction with analogue signal sampling and the concrete processing mode of fetal movement monitoring algorithm be:
1). the input sample window size of ADIN1 passage is set;
2). open the input sample function of ADIN1 passage;
3). open the external interrupt of CPU;
4). wait for fetal movement interrupt signal, and judge whether to produce external interrupt;
5). when there being external interrupt to produce, close external interrupt; Otherwise continue execution 4) operation;
6). after closing external interrupt, adopt rolling average algorithm to calculate the moving average of ADIN1 channel sample signal when interrupting generation, and judge whether the moving average of ADIN1 channel sample signal is greater than normal Fetal Movement Signal threshold value;
7) if. moving average is greater than normal Fetal Movement Signal threshold value, produces a fetal movement, and shake rails fatigue resistance; Otherwise continue execution 4) operation.
8. a kind of fetus fetal movement fetal heart rate signal monitoring system as claimed in claim 6, is characterized in that, in Article 2 branch road, the concrete processing mode in conjunction with analogue signal sampling and fetal rhythm monitoring algorithm is:
1). the sampling window size of ADIN2 passage, ADIN3 passage is set;
2). open the input sample function of ADIN2 passage, ADIN3 passage;
3). the sampled signal size of every road monitoring channel of sampling successively by sample frequency, and judge whether to arrive sampling window;
4). when arriving sampling window, adopting rolling average algorithm to calculate the moving average of ADIN2 channel sample signal when interrupting generation, then judging whether the moving average of ADIN2 channel sample signal is greater than normal fetal heart rate signal threshold value;
5). when the moving average of ADIN2 channel sample signal is greater than normal fetal heart rate signal threshold value, then judge whether there is effective Fetal Movement Signal in epicycle sampling window according to fetal movement monitoring algorithm; Otherwise, proceed 3) operation;
6). when there is not effective Fetal Movement Signal in epicycle sampling window, fast Fourier transform being carried out to the sampled data of ADIN2, ADIN3 passage, thus obtains the frequency characteristic of sampled signal; Otherwise, proceed 3) operation;
7). the amplitude of the same frequency component of ADIN2 passage, ADIN3 passage is added up;
8). calculate 7 according to sampling window) in frequency corresponding to the frequency component that obtains;
9). record 8) in the frequency that calculates, this frequency is the palmic rate of fetus.
9. a kind of fetus fetal movement fetal heart rate signal monitoring system as described in any one of claim 7,8, it is characterized in that, rolling average algorithm is:
1). the window size supposing sample space is N, and moving window equals W, wherein N>=W, the signal amplitude that the meansigma methods of an every W some calculating sampled signal is sampled as this;
2). and then gather W the point that the individual point of new W ' replaces starting most in sample space to gather, and calculate the signal amplitude that its meansigma methods samples as next round, by that analogy.
10. a kind of fetus fetal movement fetal heart rate signal monitoring system as described in any one of claim 8, it is characterized in that, fast fourier transform algorithm is:
1). provide array A
1(N), A
2and ω (N/2) (N);
2). by known record plural number array { x
kbe input to unit A
1in (k) (k is from 0 to N-1);
3). calculate ω
m=exp (-i2 π m/N) leaves (m is from 0 to (N/2)-1) in unit ω (m) in;
4) .q circulation is from 1 to p, if q is odd number perform 5), otherwise perform 6);
5) .k circulation is from 0 to 2
p-q-1, j circulation is from 0 to 2
p-1-1, calculate
A
2(k2
q+j)＝A
1(k2
q-1+j)+A
1(k2
q-1+j+2
p-1)
A
2(k2
q+j+2
q-1)＝[A
1(k2
q-1+j)-A
2(k2
q-1+j+2
q-1)]ω(k2
q-1)
Perform 7);
6) .k circulation is from 0 to 2
p-q-1, j circulation is from 0 to 2
q-1, calculate
A
1(k2
q+j)＝A
2(k2
q-1+j)+A
2(k2
q-1+j+2
p-1)
A
1(k2
q+j+2
q-1)＝[A
2(k2
q-1+j)-A
2(k2
q-1+j+2
q-1)]ω(k2
q-1)
K, j loop ends, performs next step;
7) if. q=p perform 8), otherwise q+1 → q perform 4);
8) .q loop ends, if p=even number, by A
1(j) → A
2(j), then c
j=A
2(j) (j=0,1,2 ... N-1) required by being.
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