CN103211624A - Method and device for improving accuracy of Doppler fetal heart rate data - Google Patents
Method and device for improving accuracy of Doppler fetal heart rate data Download PDFInfo
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Abstract
The invention relates to a method and a device for improving the accuracy of Doppler fetal heart rate data. The method comprises steps of respectively performing hardware zero-crossing checking processing and self-correlation processing on preprocessed fetal heart Doppler envelope signals so as to obtain a first fetal heart rate and a second fetal heart rate; updating a corrected heart rate zone with the most second fetal heart rate occurrence probability through the first fetal heart rate; enabling a measured interval to be more accurate through updating the corrected heart rate zone with the most second fetal heart rate occurrence probability so as to obtain the more accurate and higher-statistic probability corrected heart rate zone with the most second fetal heart rate occurrence probability; and furthermore, obtaining the more accurate human body heart rate value. By utilizing the method, the monitoring intermediate data is adjusted and corrected so as to improve the detection accuracy, less hardware resources are needed, and the method is low in cost and easy to implement.
Description
Technical field
The present invention relates to the fetal heart rate signal process field, be specifically related to a kind of method and device thereof of the Doppler's of raising fetal rhythm rate data accuracy
Background technology
The fetal rhythm rate detects and has great importance in clinical diagnosis, and the especially monitoring of perinatal stage fetal rhythm rate more helps to improve fetus childbirth quality, reduces fetal anomaly rate and mortality rate.The fetal rhythm rate detects roughly two stages of branch, in early stage (preceding 28 pregnant week) mainly is to detect based on fetal rhythm Doppler, in the later stage (after 28 pregnant weeks) mainly is based on the fetal monitor detection, both main distinctions are continuous ultrasound Doppler for fetal rhythm Doppler, transmitting power is bigger, be used for short time fetal rhythm rate inspection, the equipment that is used to detect is generally lighter, small and exquisite, and price is relatively cheap; Fetal monitor is impulse ultrasound Doppler, and transmitting power is little, is used for long-time fetal rhythm rate and detects, and the equipment relative volume that is used to check is bigger, and price is more expensive relatively.
In the fetal rhythm rate of ultrasonic doppler is asked for, autocorrelation technique is one and generally acknowledges the maturation method that uses, it has can make periodic signal be strengthened and characteristic that random noise is weakened, can reduce the influence of interference to a certain extent to signal, so on fetal rhythm Doppler and fetal monitor, all generally use, but in the processing of self correlation back, both have bigger difference, the reason that this situation occurs is that fetal rhythm Doppler detects in short-term, several at least generally speaking seconds, at most a few minutes, so comparatively speaking, more pay attention to out the speed of value, and fetal monitor is long-time the detection, general minimum is 20 minutes, several hours or tens hours at most, so more pay attention to numerical stability comparatively speaking.
At present, fetal rhythm Doppler detects and fetal monitor detects all complexity comparatively of post processing comparatively speaking in the prior art, can use the processing method on fetal rhythm Doppler to be not suitable for being used on the fetal monitor, and the post-processing approach that fetal rhythm Doppler detects needs more hardware resource, causes cost too high
Summary of the invention
For overcoming above-mentioned defective, purpose of the present invention promptly is to provide a kind of implementation cost low, the method for the less and raising Doppler fetal rhythm rate data accuracy that is easy to realize of hardware resource requirements.
The present invention also aims to provide the device of this raising of a kind of application Doppler fetal rhythm rate data accuracy method.
The objective of the invention is to be achieved through the following technical solutions:
A kind of method that improves Doppler's fetal rhythm rate data accuracy of the present invention comprises:
Pretreated fetal rhythm Doppler envelope signal is carried out the hardware zero passage detection handle, the output impulse wave;
Try to achieve two interpulse intervals according to described impulse wave, and calculate the first fetal rhythm rate according to this interval;
Pretreated fetal rhythm Doppler envelope signal is carried out auto-correlation processing, obtain self correlation sequence as a result;
To self correlation as a result sequence carry out peak value and detect, determine the first main peak value, and try to achieve the fetal rhythm cycle, and then calculate the second fetal rhythm rate according to this first main peak value, utilize the first fetal rhythm rate that the second fetal rhythm rate is revised, obtain the revised second fetal rhythm rate;
Determine and obtain the heart rate interval of the revised second fetal rhythm rate probability of occurrence maximum.
As a kind of improvement of the present invention, described pretreated fetal rhythm Doppler envelope signal is carried out also comprising before the hardware zero passage detection treatment step default effective heart rate interval; The described heart rate interval of determining and obtaining the revised second fetal rhythm rate probability of occurrence maximum is: by the revised second fetal rhythm rate described default effective heart rate interval is upgraded, obtain the heart rate interval of the revised second fetal rhythm rate probability of occurrence maximum.
As another kind of improvement the of the present invention, the described step of utilizing the first fetal rhythm rate that the second fetal rhythm rate is revised is:
The first fetal rhythm rate and the second fetal rhythm rate are compared, judge whether the second fetal rhythm rate is effective multiple relation of the first fetal rhythm rate, if, with the second fetal rhythm rate as the revised second fetal rhythm rate, if not, calculate on the heart rate interval first which multiple value of fetal rhythm rate drops on the revised second fetal rhythm rate probability of occurrence maximum, the first fetal rhythm rate is multiplied by this multiple value as the revised second fetal rhythm rate.
As a further improvement on the present invention, the described step of utilizing the first fetal rhythm rate that the second fetal rhythm rate is revised is:
The first fetal rhythm rate and the second fetal rhythm rate are compared, if both differ less than predetermined threshold value, with the second fetal rhythm rate as the revised second fetal rhythm rate; If both differ by more than predetermined threshold value, judge then whether the second fetal rhythm rate is effective multiple relation of the first fetal rhythm rate, if, with the second fetal rhythm rate as the revised second fetal rhythm rate, if not, calculate on the heart rate interval first which multiple value of fetal rhythm rate drops on the second fetal rhythm rate probability of occurrence maximum, the first fetal rhythm rate is multiplied by this multiple value as the revised second fetal rhythm rate.
Further improve as of the present invention, the pretreatment in the described pretreated fetal rhythm Doppler envelope signal is: fetal rhythm Doppler envelope signal data are carried out denoising, Filtering Processing; Describedly pretreated fetal rhythm Doppler envelope signal is carried out the hardware zero passage detection be treated to: judge whether fetal rhythm Doppler envelope signal surpasses predetermined threshold value, if surpass predetermined threshold value, the output impulse wave, otherwise export 0.
A kind of device of using above-mentioned raising Doppler fetal rhythm rate data accuracy method, this device mainly comprises:
Hardware zero passage detection unit is used for pretreated fetal rhythm Doppler envelope signal is carried out zero passage detection, and the output impulse wave;
The pulse spacing computing unit is connected with hardware zero passage detection unit, and the impulse wave according to the output of hardware zero passage detection unit calculates two interpulse intervals;
The first fetal rhythm rate computing unit is connected with the pulse spacing computing unit, and the interpulse interval according to the pulse spacing computing unit calculates calculates the first fetal rhythm rate;
The auto-correlation processing unit is used for pretreated fetal rhythm Doppler envelope signal is carried out auto-correlation processing, obtains self correlation sequence as a result;
Peak detection unit is connected with the auto-correlation processing unit, according to the self correlation of auto-correlation processing unit output as a result sequence obtain the first main peak value;
The second fetal rhythm rate computing unit is connected with peak detection unit, and the first main peak value of exporting according to peak detection unit calculates second fetal heart frequency;
Calculating is handled according to the revised second fetal rhythm rate data value in the scheduled duration in heart rate interval probability statistics unit, determines the heart rate interval of the revised second fetal rhythm rate probability of occurrence maximum;
The second fetal rhythm rate amending unit is connected with the first fetal rhythm rate computing unit, the second fetal rhythm rate computing unit and heart rate interval probability statistics unit, and the first fetal rhythm rate and the second fetal rhythm rate are compared, and obtains the revised second fetal rhythm rate; According to the revised second fetal rhythm rate, calculating is handled to the revised second fetal rhythm rate data value again in described heart rate interval probability statistics unit, upgrades the heart rate interval of the revised second fetal rhythm rate probability of occurrence maximum.
As a kind of improvement of the present invention, described device also comprises pretreatment unit; Described pretreatment unit carries out denoising, Filtering Processing to fetal rhythm Doppler envelope signal.
As a further improvement on the present invention, described device also comprises data acquisition unit; Described data acquisition unit is responsible for gathering fetal rhythm Doppler envelope signal.
Further improve as of the present invention, described device also comprises:
Fetal rhythm rate determining unit, described fetal rhythm rate determining unit is connected with the second fetal rhythm rate amending unit, is used for the revised second fetal rhythm rate is treated to fetal rhythm rate video data;
Display unit, described display unit is connected with fetal rhythm rate determining unit, is used for fetal rhythm rate video data is exported demonstration.
A kind of method that improves Doppler's fetal rhythm rate data accuracy provided by the invention, the hardware zero passage detection is handled and auto-correlation processing obtains the first fetal rhythm rate and the second fetal rhythm rate by pretreated fetal rhythm Doppler envelope signal is carried out respectively, and upgrade by the heart rate interval of the first fetal rhythm rate to the revised second fetal rhythm rate probability of occurrence maximum, by renewal, make that the interval of measuring is more accurate to the heart rate interval of the revised second fetal rhythm rate probability of occurrence maximum; Make and the heart rate interval of the revised second fetal rhythm rate probability of occurrence maximum that the measurement data that device obtained is more accurate, its statistical probability value is higher of a kind of Doppler's of raising fetal rhythm of the present invention rate data accuracy can further obtain human heart rate's numerical value more accurately.The present invention is by adjusting the accuracy of correction improve to detect to the intermediate data of monitoring, and its needed hardware resource is few, and cost is low, is easy to realize.
Description of drawings
In order to be easy to explanation, the present invention is done to describe in detail by following preferred embodiment and accompanying drawing.
Fig. 1 is the fetal rhythm Doppler envelope signal that collects;
Fig. 2 is the pulse wave signal of hardware zero passage detection output;
Fig. 3 is a self correlation sequence as a result;
Fig. 4 is a kind of flow chart that improves Doppler's fetal rhythm rate data accuracy method of the present invention;
Fig. 5 is a kind of concrete implementing procedure figure that improves Doppler's fetal rhythm rate data accuracy method of the present invention;
Fig. 6 is a kind of definite flow chart of the revised second fetal rhythm rate in the inventive method;
Fig. 7 determines flow chart for the another kind of the revised second fetal rhythm rate in the inventive method;
Fig. 8 is a kind of raising of the present invention Doppler fetal rhythm rate data accuracy schematic representation of apparatus.
The specific embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
A kind of method that improves Doppler's fetal rhythm rate data accuracy, the signal of gathering and handling is the fetal rhythm Doppler envelope signal of ultrasonic echo.As shown in Figure 1, being the fetal rhythm Doppler envelope signal that collects, this fetal rhythm Doppler envelope signal is carried out pretreatment, mainly is that this fetal rhythm Doppler envelope signal is carried out processing such as denoising, filtering.As shown in Figure 4, this method comprises the steps:
Pretreated fetal rhythm Doppler envelope signal is divided into two-way, and one the tunnel is used for the hardware zero passage detection handles, and one the tunnel is used for auto-correlation processing.
, the hardware zero passage detection, with pretreated fetal rhythm Doppler envelope signal by the hardware zero passage detection, the output impulse wave, detailed process is: judge whether fetal rhythm Doppler envelope signal surpasses predetermined threshold value, if surpass predetermined threshold value, and the output impulse wave, otherwise export 0, as shown in Figure 2.
, calculate the pulse spacing, try to achieve two interpulse intervals by impulse wave.
, calculate the first fetal rhythm rate, calculate the first fetal rhythm rate according to two interpulse intervals.
, auto-correlation processing, pretreated fetal rhythm Doppler envelope signal is carried out auto-correlation processing, obtain self correlation sequence as a result, as shown in Figure 3.
, peak value detects, to the self correlation that obtains as a result sequence carry out peak value and detect, determine the first main peak value;
106, calculate the second fetal rhythm rate, according to self correlation as a result the first main peak value of sequence try to achieve the fetal rhythm cycle, and then the second fetal rhythm rate is calculated in conversion.
, determine and obtain the heart rate interval of the revised second fetal rhythm rate probability of occurrence maximum.The revised second fetal rhythm rate data value that obtains is carried out computing, determine the heart rate interval of the revised second fetal rhythm rate probability of occurrence maximum, if obtain the revised second fetal rhythm rate for the first time, then this revised second fetal rhythm rate data value quantity is one, be followed successively by the basis, this revised second fetal rhythm rate data value quantity progressively increases.Described method of the revised second fetal rhythm rate data value being carried out the heart rate interval of computing and then definite revised second fetal rhythm rate probability of occurrence maximum can be added up by the by stages also can be by carrying out the method that two numerical value differ comparison respectively to the revised second fetal rhythm rate data value, judge whether its difference determines that less than predetermined threshold value two numerical value are in the same heart rate interval, also can judge by the revised second fetal rhythm rate data values whole in the scheduled duration being carried out extreme value, obtain a maximum and a minima, calculate the difference of other data values and this maximum and minima and judge which heart rate interval this data value is positioned at, then obtain the heart rate interval of probability of occurrence maximum, in this specific embodiment, preferably use the by stages statistical method to try to achieve the heart rate interval of the revised second fetal rhythm rate probability of occurrence maximum.Compare by the first fetal rhythm rate and the second fetal rhythm rate, the second fetal rhythm rate is revised, obtain the revised second fetal rhythm rate.The revised second fetal rhythm rate that utilization at last obtains is upgraded the heart rate interval of the revised second fetal rhythm rate probability of occurrence maximum.
For the ease of understanding, present invention is described with another embodiment below, and referring to Fig. 5 and Fig. 6, the concrete step of implementing is as follows:
200, default effective heart rate interval in effective heart rate interval 30-240BPM scope, is that heart rate interval is an example with 10BPM, and default effective heart rate interval can be divided into 10-20BPM, 20-30BPM etc.
Pretreated fetal rhythm Doppler envelope signal is divided into two-way, and one the tunnel is used for the hardware zero passage detection handles, and one the tunnel is used for auto-correlation processing.
, the hardware zero passage detection.Pretreated fetal rhythm Doppler envelope signal by the hardware zero passage detection, is exported impulse wave, and detailed process is: judge whether fetal rhythm Doppler envelope signal surpasses predetermined threshold value, if surpass predetermined threshold value, and the output impulse wave, otherwise export 0, as shown in Figure 2.
, calculate the pulse spacing.Try to achieve two interpulse intervals by impulse wave.
, calculate the first fetal rhythm rate.Calculate the first fetal rhythm rate according to two interpulse intervals.
, auto-correlation processing.Pretreated fetal rhythm Doppler envelope signal is carried out auto-correlation processing, obtain self correlation sequence as a result.As shown in Figure 3.
, peak value detects.To the self correlation that obtains as a result sequence carry out peak value and detect, determine the first main peak value;
206, calculate the second fetal rhythm rate.According to self correlation as a result the first main peak value of sequence try to achieve the fetal rhythm cycle, and then the second fetal rhythm rate is calculated in conversion.
, statistics heart rate interval probability, according to default effective heart rate interval, to the distributed area of the revised second fetal rhythm rate result in nearest a period of time, statistics heart rate interval probability.Concrete is exactly that the revised second fetal rhythm rate result in nearest a period of time is carried out the by stages statistics, determine the heart rate interval of probability of occurrence maximum, such as with 10BPM as a heart rate interval, the result of calculation of 5 revised second fetal rhythm rates is respectively 125BPM, 125BPM, 124BPM, 144BPM, 145BPM, so just having heart rate interval is 120BPM-130BPM and 140BPM-150BPM, and the probability of appearance is respectively 3/5 and 2/5.The heart rate interval of probability of occurrence maximum is 120BPM-130BPM, and this default effective heart rate interval is between default constant region, simultaneously this heart rate interval begin and end value all in effective fetal rhythm scope 30-240BPM.
, obtain the revised second fetal rhythm rate, as described in Figure 6, obtain the flow chart of the revised second fetal rhythm rate, specifically comprise:
2081, judge whether the second fetal rhythm rate is effective multiple relation of the first fetal rhythm rate, be specially: judge whether the second fetal rhythm rate is the multiple of the first fetal rhythm rate, and whether the first fetal rhythm rate and the second fetal rhythm rate be all in effective fetal rhythm scope 30-240BPM, if, then enter step 2082, if not, then enter step 2083.
, with the second fetal rhythm rate as the revised second fetal rhythm rate.
, determine the revised second fetal rhythm rate according to the heart rate interval of probability maximum.If the second fetal rhythm rate is not effective multiple relation of the first fetal rhythm rate, so just the heart rate interval according to probability of occurrence maximum in the step 207 comes the second fetal rhythm rate is revised.The method of revising is: see which multiple of the first fetal rhythm rate drops on the heart rate interval of probability maximum, it is exactly the revised second fetal rhythm rate that the first fetal rhythm rate is multiplied by that multiple.According to the revised second fetal rhythm rate, enter step 207, again the revised second fetal rhythm rate data value is carried out the by stages statistics, upgrade the heart rate interval of the revised second fetal rhythm rate probability of occurrence maximum.As giving an example in above-mentioned 207 steps, if the existing revised second fetal rhythm rate data that obtain are 148BPM, the then revised second fetal rhythm rate result of calculation is respectively 125BPM, 124BPM, 144BPM, 145BPM, 148BPM, the revised second fetal rhythm rate data value 125BPM that obtains for the first time promptly is replaced before, and so just having heart rate interval is 120BPM-130BPM and 140BPM-150BPM, and the probability of appearance is respectively 2/5 and 3/5.The heart rate interval of probability of occurrence maximum promptly is updated to 140BPM-150BPM.
As shown in Figure 7, obtain the another kind of flow chart of the revised second fetal rhythm rate, specifically comprise:
2084, judge whether the first fetal rhythm rate is consistent with the second fetal rhythm rate, judge that promptly both differ whether less than predetermined threshold value.If both differ less than predetermined threshold value, enter step 2088; If both differ by more than predetermined threshold value, then enter step 2085.
, judge that whether the second fetal rhythm rate is effective multiple relation of the first fetal rhythm rate, be specially: judge whether the second fetal rhythm rate is the multiple of the first fetal rhythm rate, and whether the first fetal rhythm rate and the second fetal rhythm rate be all in effective fetal rhythm scope 30-240BPM, if, then enter step 2086, if not, then enter step 2087.
, with the second fetal rhythm rate as the revised second fetal rhythm rate.
, determine the revised second fetal rhythm rate according to the heart rate interval of probability maximum.If the first fetal rhythm rate, the second fetal rhythm rate differ by more than predetermined threshold value and the second fetal rhythm rate is not effective multiple relation of the first fetal rhythm rate, so just the heart rate interval according to probability of occurrence maximum in the step 207 comes the second fetal rhythm rate is revised.The method of revising is: see which multiple of the first fetal rhythm rate drops on the heart rate interval of probability maximum, it is exactly the revised second fetal rhythm rate that the first fetal rhythm rate is multiplied by that multiple.
, with the second fetal rhythm rate as the revised second fetal rhythm rate.
According to the revised second fetal rhythm rate, enter step 207, again the revised second fetal rhythm rate data value is carried out the by stages statistics, upgrade the heart rate interval of the revised second fetal rhythm rate probability of occurrence maximum.
As shown in Figure 7, a kind of device that improves Doppler's fetal rhythm rate data accuracy of the present invention, it is as follows that it forms framework:
Fetal rhythm Doppler envelope signal after the pretreatment unit processing is divided into two-way: the one tunnel gives hardware zero passage detection unit 303, a tunnel gives auto-correlation processing unit 306.
Hardware zero passage detection unit 303 is connected with pretreatment unit 302, is used for the fetal rhythm Doppler envelope signal that pretreatment unit 302 is handled is carried out zero passage detection, and the output impulse wave.
Pulse spacing computing unit 304 is connected with hardware zero passage detection unit 303, according to the impulse wave of hardware zero passage detection unit 303 outputs, calculates the interval of two pulses.
The first fetal rhythm rate computing unit 305 is connected with pulse spacing computing unit 304, in the pulse spacing according to pulse spacing computing unit 304 calculates, calculates the first fetal rhythm rate.
Auto-correlation processing unit 306 is connected with pretreatment unit 302, is used for pretreated fetal rhythm Doppler envelope signal is carried out auto-correlation processing, obtains self correlation sequence as a result.
The second fetal rhythm rate computing unit 308 is connected with peak detection unit 307, and the first main peak value according to peak detection unit 307 outputs calculates second fetal heart frequency.
Heart rate interval probability statistics unit 309, carry out the by stages statistics according to the revised second fetal rhythm rate data value in the scheduled duration, determine the heart rate interval of the revised second fetal rhythm rate probability of occurrence maximum, if obtain the revised second fetal rhythm rate score for the first time.The revised second fetal rhythm rate that obtains is stored as first revised second fetal rhythm rate data value, increase gradually and upgrade this revised second fetal rhythm rate data value.
The second fetal rhythm rate amending unit 310, be connected with the first fetal rhythm rate computing unit 305, the second fetal rhythm rate computing unit 308 and heart rate interval probability statistics unit 309, determine the revised second fetal rhythm rate according to the first fetal rhythm rate, the second fetal rhythm rate and heart rate interval probability, the revised second fetal rhythm rate result that while heart rate interval probability statistics unit 309 is determined according to the second fetal rhythm rate amending unit 310, the parameter of renewal heart rate interval probability statistics unit 309.The second fetal rhythm rate amending unit 310 mainly is that the first fetal rhythm rate, the second fetal rhythm rate are compared, if both differ less than predetermined threshold value, the second fetal rhythm rate is in the main true so, with the second fetal rhythm rate as the revised second fetal rhythm rate.If both differ by more than predetermined threshold value, then judge whether to satisfy multiple relation, if satisfy, with the second fetal rhythm rate as the revised second fetal rhythm rate.If both differ by more than predetermined threshold value and do not meet the multiple relation again, so just the heart rate interval according to the probability of occurrence maximum comes the second fetal rhythm rate result is revised.The method of revising is: see which multiple of the first fetal rhythm rate drops on the heart rate interval of probability maximum, it is exactly the revised second fetal rhythm rate that the first fetal rhythm rate is multiplied by that multiple.According to the revised second fetal rhythm rate that obtains, again heart rate interval probability statistics unit 309 is carried out the by stages statistics, upgrade the heart rate interval of the revised second fetal rhythm rate probability of occurrence maximum.
Fetal rhythm rate determining unit 311, described fetal rhythm rate determining unit 311 is connected with the second fetal rhythm rate amending unit 310, is used for the revised second fetal rhythm rate is treated to fetal rhythm rate video data; Show output because the revised second fetal rhythm rate that the second fetal rhythm rate amending unit 310 is obtained can not be directly used in, this fetal rhythm rate determining unit 311 is used for the revised second fetal rhythm rate is treated to the fetal rhythm rate video data that can be used to show output.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention
Claims (10)
1. a method that improves Doppler's fetal rhythm rate data accuracy is characterized in that, comprising:
Pretreated fetal rhythm Doppler envelope signal is carried out the hardware zero passage detection handle, the output impulse wave;
Try to achieve two interpulse intervals according to described impulse wave, and calculate the first fetal rhythm rate according to this interval;
Pretreated fetal rhythm Doppler envelope signal is carried out auto-correlation processing, obtain self correlation sequence as a result;
To self correlation as a result sequence carry out peak value and detect, determine the first main peak value, and try to achieve the fetal rhythm cycle, and then calculate the second fetal rhythm rate according to this first main peak value, utilize the first fetal rhythm rate that the second fetal rhythm rate is revised, obtain the revised second fetal rhythm rate;
Determine and obtain the heart rate interval of the revised second fetal rhythm rate probability of occurrence maximum.
2.
A kind of method that improves Doppler's fetal rhythm rate data accuracy according to claim 1 is characterized in that, described pretreated fetal rhythm Doppler envelope signal is carried out also comprising before the hardware zero passage detection treatment step default effective heart rate interval; The described heart rate interval of determining and obtaining the revised second fetal rhythm rate probability of occurrence maximum is: by the revised second fetal rhythm rate described default effective heart rate interval is upgraded, obtain the heart rate interval of the revised second fetal rhythm rate probability of occurrence maximum.
3.
A kind of method that improves Doppler's fetal rhythm rate data accuracy according to claim 1 is characterized in that, the described step of utilizing the first fetal rhythm rate that the second fetal rhythm rate is revised is:
The first fetal rhythm rate and the second fetal rhythm rate are compared, judge whether the second fetal rhythm rate is effective multiple relation of the first fetal rhythm rate, if, with the second fetal rhythm rate as the revised second fetal rhythm rate, if not, calculate on the heart rate interval first which multiple value of fetal rhythm rate drops on the revised second fetal rhythm rate probability of occurrence maximum, the first fetal rhythm rate is multiplied by this multiple value as the revised second fetal rhythm rate.
4.
A kind of method that improves Doppler's fetal rhythm rate data accuracy according to claim 1 is characterized in that, the described step of utilizing the first fetal rhythm rate that the second fetal rhythm rate is revised is:
The first fetal rhythm rate and the second fetal rhythm rate are compared, if both differ less than predetermined threshold value, with the second fetal rhythm rate as the revised second fetal rhythm rate; If both differ by more than predetermined threshold value, judge then whether the second fetal rhythm rate is effective multiple relation of the first fetal rhythm rate, if, with the second fetal rhythm rate as the revised second fetal rhythm rate, if not, calculate on the heart rate interval first which multiple value of fetal rhythm rate drops on the second fetal rhythm rate probability of occurrence maximum, the first fetal rhythm rate is multiplied by this multiple value as the revised second fetal rhythm rate.
5.
According to claim 3 or 4 described a kind of methods that improve Doppler's fetal rhythm rate data accuracy, it is characterized in that, describedly judge that whether the second fetal rhythm rate is that effective multiple of the first fetal rhythm rate closes and is: judge whether the second fetal rhythm rate is the multiple of the first fetal rhythm rate, and the first fetal rhythm rate and the second fetal rhythm rate are all whether in effective fetal rhythm scope 30-240BPM.
6.
A kind of method that improves Doppler's fetal rhythm rate data accuracy according to claim 1 is characterized in that, the pretreatment in the described pretreated fetal rhythm Doppler envelope signal is: fetal rhythm Doppler envelope signal data are carried out denoising, Filtering Processing; Describedly pretreated fetal rhythm Doppler envelope signal is carried out the hardware zero passage detection be treated to: judge whether fetal rhythm Doppler envelope signal surpasses predetermined threshold value, if surpass predetermined threshold value, the output impulse wave, otherwise export 0.
7.
A kind of application rights requires the device of 1 described raising Doppler fetal rhythm rate data accuracy method, it is characterized in that this device mainly comprises:
Hardware zero passage detection unit is used for pretreated fetal rhythm Doppler envelope signal is carried out zero passage detection, and the output impulse wave;
The pulse spacing computing unit is connected with hardware zero passage detection unit, and the impulse wave according to the output of hardware zero passage detection unit calculates two interpulse intervals;
The first fetal rhythm rate computing unit is connected with the pulse spacing computing unit, and the interpulse interval according to the pulse spacing computing unit calculates calculates the first fetal rhythm rate;
The auto-correlation processing unit is used for pretreated fetal rhythm Doppler envelope signal is carried out auto-correlation processing, obtains self correlation sequence as a result;
Peak detection unit is connected with the auto-correlation processing unit, according to the self correlation of auto-correlation processing unit output as a result sequence obtain the first main peak value;
The second fetal rhythm rate computing unit is connected with peak detection unit, and the first main peak value of exporting according to peak detection unit calculates second fetal heart frequency;
Calculating is handled according to the revised second fetal rhythm rate data value in the scheduled duration in heart rate interval probability statistics unit, determines the heart rate interval of the revised second fetal rhythm rate probability of occurrence maximum;
The second fetal rhythm rate amending unit is connected with the first fetal rhythm rate computing unit, the second fetal rhythm rate computing unit and heart rate interval probability statistics unit, and the first fetal rhythm rate and the second fetal rhythm rate are compared, and obtains the revised second fetal rhythm rate; According to the revised second fetal rhythm rate, calculating is handled to the revised second fetal rhythm rate data value again in described heart rate interval probability statistics unit, upgrades the heart rate interval of the revised second fetal rhythm rate probability of occurrence maximum.
8.
A kind of device that improves Doppler's fetal rhythm rate data accuracy according to claim 7 is characterized in that described device also comprises pretreatment unit; Described pretreatment unit carries out denoising, Filtering Processing to fetal rhythm Doppler envelope signal.
9.
A kind of device that improves Doppler's fetal rhythm rate data accuracy according to claim 7 is characterized in that described device also comprises data acquisition unit; Described data acquisition unit is responsible for gathering fetal rhythm Doppler envelope signal.
10.
According to each described a kind of device that improves Doppler's fetal rhythm rate data accuracy of claim 7-9, it is characterized in that described device also comprises:
Fetal rhythm rate determining unit, described fetal rhythm rate determining unit is connected with the second fetal rhythm rate amending unit, is used for the revised second fetal rhythm rate is treated to fetal rhythm rate video data;
Display unit, described display unit is connected with fetal rhythm rate determining unit, is used for fetal rhythm rate video data is exported demonstration
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| CN103494605A (en) * | 2013-10-09 | 2014-01-08 | 清华大学 | Heart rate detection method and device |
| CN104873222A (en) * | 2015-05-08 | 2015-09-02 | 浙江铭众生物医学创业投资有限公司 | Fetal heart rate detection method based on smart mobile terminal |
| CN105962973A (en) * | 2016-07-22 | 2016-09-28 | 深圳掌康科技有限公司 | Acquiring method of fetal heart rate and fetus-voice meter |
| CN106659409A (en) * | 2014-08-18 | 2017-05-10 | 卡梅伦保健公司 | Implantable medical device with self-correlation means and with peak selector means for estimating cardiac rate |
| CN110074816A (en) * | 2019-04-26 | 2019-08-02 | 深圳市理邦精密仪器股份有限公司 | Fetal Heart Rate determines method, apparatus and terminal device |
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| CN110074816A (en) * | 2019-04-26 | 2019-08-02 | 深圳市理邦精密仪器股份有限公司 | Fetal Heart Rate determines method, apparatus and terminal device |
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