CN103099615B - Method and device for eliminating exercise electrocardiosignal interference - Google Patents
Method and device for eliminating exercise electrocardiosignal interference Download PDFInfo
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Abstract
The invention relates to a method and a device for eliminating exercise electrocardiosignal interference. The method includes the following steps: collecting exercise electrocardiosignals and exercise reference signals; carrying out amplification and lowpass filtering on fixed gain of collected exercise electrocardiosignals; carrying out analog-digital conversion on amplified and lowpass filtered exercise electrocardiosignals and obtaining digital exercise electrocardiosignals; judging exercise interference degree of the digital exercise electrocardiosignals, and obtaining the exercise interference degree; carrying out self-adaptive elimination on the exercise electrocardiosignals and the exercise reference signals according to the exercise interference degree, and obtaining the exercise electrocardiosignals without interference. According to the method and the device, even when the exercise interference degree is very high, good exercise electrocardiosignals can still be obtained through offset of the exercise electrocardiosignals and the exercise reference signals, and accuracy and stability of eliminating exercise electrocardiosignal interference are improved.
Description
Technical field
The present invention relates to a kind of method and the device of eliminating electrocardiosignal interference, be specifically related to a kind of method and apparatus eliminating exercise ECG interference.
Background technology
At present, the ST section of exercise ECG waveform is the important indicator of assess cardiac sports load, and therefore in exercise ECG measuring process, the distortion reducing exercise ECG waveform ST section is extremely important.Typical exercise ECG DATA REASONING scheme has two kinds, the first motion measurement scheme is dull and stereotyped walking or road-work, its advantage is that everybody can do, shortcoming is that experimenter needs ceaselessly walking or running, cause the electrocardiographic wave baseline fluctuation that collects large, be sometimes even difficult to the ST section recognizing ecg wave form.The second motion measurement scheme is treadmill movement, the advantage of treadmill movement scheme is that experimenter's upper body can held stationary relatively, therefore the electrocardiographic wave baseline monitored is more steady, shortcoming be can not people's lower limb by bike can be very fast tired, overall movement quantity not sufficient, can not reach the target heart of setting.Comprehensive above 2 points, owing to adopting the motion scheme of treadmill, experimenter is not easy to reach target heart, and therefore current main flow exercise ECG testing scheme still adopts the scheme of treadmill exercise.
The testing scheme of treadmill exercise requires that experimenter ceaselessly moves in the process measured, and is convenient to make the heart rate of experimenter to reach setting value.Because human body is when strenuous exercise, the ecg wave form baseline drift collected is larger, and the degree of exercise ECG waveform baseline drift is by the movement velocity of human body and the impact of motion mode and frequency difference between each one, therefore measurement device needs to reduce motion artifacts to the impact of exercise ECG waveform.In human motion process, the ecg wave form collected superposes a large amount of irregular interference, the analysis of software to ST section can have been had a strong impact on.Traditional method is the mutually different digital filter of a series of cut-off frequency of setting, such as sets the high-pass digital filter that cut-off frequency is respectively 0.5Hz or 1Hz, the motion artifacts in filtering exercise electrocardiogram signal.When motion artifacts amplitude is larger, the digital filter that selective cut-off frequency is higher, carries out filtering to exercise electrocardiogram signal.But due to the interfering signal that human motion causes, its frequency is not fixing, and its highest frequency can easily exceed the cut-off frequency of high pass filter, cause the filter effect of high pass filter to interfering signal bad, can not baseline drift effectively in filtering exercise ECG waveform, the digital filter crossing higher cutoff frequency also can cause the ST section serious distortion of exercise ECG waveform, causes further occurring relatively large deviation using ST section waveform morphology, amplitude as evaluation index; Therefore to there is anti-movement effects poor for prior art, in exercise ECG measuring process, experimenter strenuous exercise, exercise electrocardiogram signal waveform significantly drifts about up and down, according to the digital filter that cut-off frequency is low, then cannot baseline drift in filtering exercise ECG waveform, also just cannot signal disturbing in filtering exercise electrocardiogram signal; According to the digital filter that cut-off frequency is higher, then cause the ST section distortion of ecg wave form, affect follow-up ST piecewise analysis, make analysis result there is relatively large deviation.
Summary of the invention
For overcoming above-mentioned defect, namely the technical problem to be solved in the present invention is to provide a kind of method and the device of eliminating exercise electrocardiogram signal interference;
The object of the invention is to be achieved through the following technical solutions:
A kind of method eliminating exercise electrocardiogram signal interference of the present invention, comprises the steps: to gather exercise electrocardiogram signal and motion reference signal; The carrying out of the exercise electrocardiogram signal fixed gain gathered is amplified and low-pass filtering treatment; Analog-to-digital conversion process is carried out to the exercise electrocardiogram signal after amplification and low-pass filtering treatment, obtains the exercise electrocardiogram signal of numeral; The judgement of motion artifacts width is carried out to the exercise electrocardiogram signal of numeral, judges the size of motion artifacts amplitude; According to the size of motion artifacts amplitude, self adaptation elimination is carried out to exercise electrocardiogram signal and motion reference signal, obtain the exercise electrocardiogram signal of filtering interfering; Wherein, when judging that motion artifacts amplitude is large, self adaptation elimination is carried out to exercise electrocardiogram signal and reference signal; Described to exercise electrocardiogram signal and step that motion reference signal carries out self adaptation elimination comprise: the motion reference signal of collection is divided into the identical motion reference signal of two-way and exports; Phase shift transform is carried out to the motion reference signal on a road, obtains the motion reference signal after phase shift transform; Delay disposal is carried out to another road motion reference signal, Shi Gai road motion reference signal and the motion reference signal synchronism output carried out after phase shift transform; Again summation process is weighted to this two-way motion reference signal, obtains and estimate motion reference signal; The exercise electrocardiogram signal of collection is divided into the identical exercise electrocardiogram signal of two-way to export; QRS complex wave check processing is carried out to a road exercise electrocardiogram signal; Delay disposal is carried out to another road exercise electrocardiogram signal, the exercise electrocardiogram signal on Shi Gai road with estimate motion reference signal synchronism output; To the exercise electrocardiogram signal after delay disposal with estimate motion reference signal ask difference process, acquisition filtering interfering exercise electrocardiogram signal.
Eliminate a method for exercise electrocardiogram signal interference, after wherein obtaining the exercise electrocardiogram signal of numeral, also comprise and high-pass filtering process and low-pass filtering treatment are carried out to the exercise electrocardiogram signal of mathematics.
Eliminate a method for exercise electrocardiogram signal interference, the wherein said size to motion artifacts width is carried out judgement and is comprised and carry out bandpass filtering treatment to digital exercise electrocardiogram signal, obtains motion disturbance signals; Carry out cumulative summation carrying out signal to the motion disturbance signals in a period of time, obtain interference magnitude value; Interference magnitude value and the interference magnitude threshold value preset are compared, judges the size of motion artifacts amplitude; When interference magnitude value is greater than default interference magnitude threshold value, then judge that motion artifacts amplitude is large; When interference magnitude value is less than default interference magnitude threshold value, then judge that motion artifacts amplitude is little.
Eliminate a method for exercise electrocardiogram signal interference, wherein when the motion artifacts amplitude hour judging exercise electrocardiogram signal, directly obtain exercise electrocardiogram signal.
A kind of method eliminating exercise electrocardiogram signal interference, wherein said to exercise electrocardiogram signal and step that motion reference signal carries out self adaptation elimination also comprise, result and the weight coefficient of QRS complex wave check processing result to weighted sum process according to asking difference process upgrade.
A kind of device eliminating exercise electrocardiogram signal interference, comprise the exercise ECG collecting unit gathering exercise electrocardiogram signal, gather the reference signal collecting unit of motion reference signal, exercise electrocardiogram signal is amplified and low-pass filtering treatment the amplification be connected with exercise ECG collecting unit and low-pass filter unit, the exercise electrocardiogram signal of simulation is converted to digital exercise electrocardiogram signal and the AD conversion unit be connected with amplification and low-pass filter unit, the size of the interference magnitude of exercise electrocardiogram signal is judged and the interference magnitude judging unit be connected with AD conversion unit and the size according to interference magnitude, self adaptation elimination is carried out to exercise electrocardiogram signal and motion reference signal and the signal adaptive be connected with interference magnitude judging unit with reference signal collecting unit respectively eliminates unit, wherein, described signal adaptive elimination unit comprises exercise electrocardiogram signal shunt module, motion reference signal shunt module, QRS complex wave detection module, the first Postponement module, the second Postponement module, phse conversion module, asks differential mode block and weighted sum module, described exercise electrocardiogram signal shunt module, exports for exercise electrocardiogram signal being divided into the identical exercise electrocardiogram signal of two-way, described motion reference signal shunt module, exports for motion reference signal being divided into the identical motion reference signal of two-way, described QRS complex wave detection module is connected with described exercise electrocardiogram signal shunt module, for carrying out QRS complex wave check processing to a road exercise electrocardiogram signal, described first Postponement module is connected with described exercise electrocardiogram signal shunt module, for carrying out delay disposal to the exercise electrocardiogram signal on another road, described phse conversion module is connected with described motion reference signal shunt module, for carrying out phase shift transform to a road motion reference signal, described second Postponement module is connected with described motion reference signal shunt module, for carrying out delay disposal to another road motion reference signal, described weighted sum module is connected with described second Postponement module and described phse conversion module respectively, for being weighted summation process to two-way motion reference signal, obtaining and estimates motion reference signal, described differential mode block of asking is connected with described first Postponement module and weighted sum module respectively, for the exercise electrocardiogram signal after delay disposal with estimate motion reference signal and carry out asking difference process, the exercise electrocardiogram signal of acquisition filtering interfering.
Eliminate a device for exercise electrocardiogram signal interference, between AD conversion unit and interference magnitude judging unit, wherein also comprise the filter processing unit for carrying out high-pass filtering and low-pass filtering treatment to digital exercise electrocardiogram signal.
Eliminate a device for exercise electrocardiogram signal interference, wherein said interference magnitude judging unit comprises bandpass filtering treatment module, Integral Processing module and interference magnitude judge module; Described bandpass filtering treatment module is connected with described AD conversion unit, for carrying out bandpass filtering treatment to digital exercise electrocardiogram signal, obtains motion disturbance signals; Described Integral Processing module is connected with described bandpass filtering treatment module, for carrying out cumulative summation process to the motion disturbance signals in a period of time, obtains interference magnitude value; Described interference magnitude judge module is connected with described Integral Processing module, for interference magnitude value and the interference magnitude threshold value preset being compared, judges the size of motion artifacts amplitude.
Eliminate a device for exercise electrocardiogram signal interference, wherein said signal adaptive is eliminated unit and is also comprised described right value update module; Described right value update module respectively with described QRS complex wave detection module, described in ask differential mode block and described weighted sum module to be connected, for the weight coefficient to weighted sum module upgrades according to difference signal and QRS complex wave check processing result.
Eliminate a device for exercise electrocardiogram signal interference, wherein said exercise ECG collecting unit is cardiac diagnosis lead-line; Described reference signal collecting unit is acceleration transducer.
The invention provides a kind of method and apparatus eliminating exercise electrocardiogram signal interference, human motion reference signal is gathered by arranging acceleration transducer, the baseline drift signal in motion reference signal and exercise ECG waveform is utilized to have identical variation tendency, realize motion reference signal can adaptively offset with the baseline drift interfering signal in exercise electrocardiogram signal, thus the exercise electrocardiogram signal after the motion artifacts that is eliminated; Wherein the present invention is compared with the prior art, the advantage had and beneficial effect are: 1, adopt acceleration transducer, the motion reference signal of Real-time Collection human body, utilizes the baseline drift interfering signal in motion reference signal and exercise electrocardiogram signal, can obtain good exercise electrocardiogram signal; 2, the interference magnitude threshold value preset and interference value threshold value compare, and can judge whether carry out adaptive Interference Cancellation preferably; Improve accuracy and the stability of Interference Cancellation; Even if 3, of the present invention a kind of eliminate exercise electrocardiogram signal interference method and device when motion artifacts amplitude is very large, still the counteracting of exercise electrocardiogram signal and motion reference signal can be passed through, obtain good exercise electrocardiogram signal, to facilitate the follow-up analyzing and processing for ecg wave form.
Accompanying drawing explanation
For ease of illustrating, the present invention is described in detail by following preferred embodiment and accompanying drawing.
Fig. 1 is a kind of flow chart eliminating exercise electrocardiogram signal interference method of the present invention;
Fig. 2 is a kind of point flow chart eliminating exercise electrocardiogram signal interference method of the present invention;
Fig. 3 is a kind of integral module schematic diagram eliminating exercise electrocardiogram signal countermeasure set of the present invention;
Fig. 4 is a kind of concrete module diagram eliminating exercise electrocardiogram signal countermeasure set of the present invention;
Fig. 5 is a kind of submodule schematic diagram eliminating exercise electrocardiogram signal countermeasure set of the present invention;
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Refer to Fig. 1, the invention provides a kind of method eliminating exercise electrocardiogram signal interference, specifically comprise the steps:
Step 101: gather motion reference signal and exercise electrocardiogram signal;
Detailed process is: gather the exercise electrocardiogram signal of human body by exercise ECG collecting unit and gather motion reference signal by reference to signal gathering unit; Wherein this exercise ECG collecting unit is cardiac diagnosis lead-line; This reference signal collecting unit is acceleration transducer.
Step 102: exercise electrocardiogram signal is amplified and low-pass filtering treatment;
Detailed process is: amplification exercise electrocardiogram signal being fixed to gain, and carries out low-pass filtering treatment to the exercise electrocardiogram signal after amplifying, and eliminates the interference of high frequency noise; Wherein this exercise electrocardiogram signal is analogue signal.
Step 103: analog digital conversion and Filtering Processing are carried out to exercise electrocardiogram signal;
Detailed process is: carry out analog-to-digital conversion process to exercise electrocardiogram signal, and the exercise electrocardiogram signal being about to simulation is converted to the exercise electrocardiogram signal of numeral; And high-pass filtering and low-pass filtering treatment are carried out to the exercise electrocardiogram signal of numeral, thus the interference of the low frequency eliminated in digital moving electrocardiosignal and high frequency noise.
Step 104: motion artifacts amplitude judges;
Detailed process is: carry out the judgement of motion artifacts width to the exercise electrocardiogram signal of numeral, judge the size of motion artifacts amplitude; Present embodiment preferred motion artifacts amplitude determining step is: first, bandpass filtering treatment is carried out to the digital moving electrocardiosignal after analog digital conversion and Filtering Processing, obtain motion disturbance signals, be namely motion disturbance signals by the exercise electrocardiogram signal after bandpass filtering treatment; Carry out Integral Processing to the motion disturbance signals in a period of time, obtain interference magnitude value, namely Integral Processing comprises and carries out signal to motion disturbance signals and carry out cumulative summation, and the result of summation is interference magnitude value; This interference magnitude value and the interference magnitude threshold value preset are compared, judges the size of motion artifacts amplitude; When interference magnitude value is greater than default interference magnitude threshold value, then judge that motion artifacts amplitude is large; When interference magnitude value is less than default interference magnitude threshold value, then judge that motion artifacts amplitude is little.
Step 105: self adaptation elimination is carried out to exercise electrocardiogram signal and motion reference signal;
Detailed process is: when judging that the motion artifacts amplitude of exercise electrocardiogram signal is large, then need to carry out self adaptation elimination to exercise electrocardiogram signal and motion reference signal.
Step 106: obtain final electrocardiosignal;
Detailed process is: when judging the motion artifacts amplitude hour of exercise electrocardiogram signal, then the digital moving electrocardiosignal after analog digital conversion and Filtering Processing is the final electrocardiosignal of acquisition; When judging that the motion artifacts amplitude of exercise electrocardiogram signal is large, then exercise electrocardiogram signal and motion reference signal carry out the result after self adaptation elimination, are final electrocardiosignal.
Please refer to Fig. 2, wherein a kind of specific implementation eliminating the step 105 of the method for exercise electrocardiogram signal interference of the present invention is step by step:
Step 151: the motion reference signal of collection is divided into two-way;
Detailed process is: the motion reference signal of collection is divided into the identical motion reference signal of two-way and exports.
Step 152: a road motion reference signal is carried out phase shift transform, and delay disposal is carried out on another road;
Detailed process is: carry out phase shift transform to a road motion reference signal, present embodiment preferably carries out 90 degree of phase shift transform to the motion reference signal on this road, obtains the motion reference signal after phase shift transform; Again delay disposal is carried out to another road motion reference signal, with Shi Gai road motion reference signal with carry out the motion reference signal synchronism output after phase shift transform.
Step 153: summation process is weighted to this two paths of signals, obtains and estimate signal;
Detailed process is: be weighted summation process to two-way motion reference signal, obtain and estimate motion reference signal and export.
Step 154: exercise electrocardiogram signal is divided into two-way;
Detailed process is: the exercise electrocardiogram signal of collection is divided into the identical exercise electrocardiogram signal of two-way and exports.
Step 155: a road exercise electrocardiogram signal is carried out the detection of QRS complex wave, and delay disposal is carried out on another road;
Detailed process is: carry out QRS complex wave check processing to a road exercise electrocardiogram signal, obtains the exercise electrocardiogram signal after detecting; Again delay disposal is carried out to another road exercise electrocardiogram signal, the exercise electrocardiogram signal on Shi Gai road with estimate motion reference signal synchronism output.
Step 156: to exercise electrocardiogram signal with estimate signal ask difference process, acquisition difference signal;
Detailed process is: to the exercise electrocardiogram signal after delay disposal with estimate motion reference signal ask difference process, acquisition difference signal; Again by this difference signal through stabilized treatment after a while, obtain the exercise electrocardiogram signal of filtering interfering;
Step 157: weight coefficient is upgraded;
Detailed process is: according to the difference signal obtained and QRS complex wave check processing result, upgrade the weight coefficient of weighted sum process.
Step 106: obtain final electrocardiosignal;
Detailed process is: the exercise electrocardiogram signal obtaining filtering interfering, and this electrocardiosignal is the final exercise electrocardiogram signal exported.
Refer to Fig. 3, the invention provides a kind of device eliminating exercise electrocardiogram signal interference, comprising: exercise ECG collecting unit 30, amplification and low-pass filter unit 31, analog digital conversion and filter unit 32, interference magnitude judging unit 33, reference signal collecting unit 34, signal adaptive elimination unit 35 and electrocardiosignal acquiring unit 37; Described exercise ECG collecting unit 30 gathers the exercise electrocardiogram signal of human body, and this exercise ECG collecting unit is cardiac diagnosis lead-line; Described amplification and low-pass filter unit 31 are connected with described exercise ECG collecting unit 30, for amplifying and low-pass filtering treatment exercise electrocardiogram signal; Described analog digital conversion and filter unit 32 are connected with described amplification and low-pass filter unit 31, for carrying out analog-to-digital conversion process to exercise electrocardiogram signal, the exercise electrocardiogram signal of simulation are converted to the exercise electrocardiogram signal of numeral; And high-pass filtering and low-pass filtering treatment are carried out to the exercise electrocardiogram signal of numeral; Described interference magnitude judging unit 33 is connected with described analog digital conversion and filter unit 32, and the size for the interference magnitude to exercise electrocardiogram signal judges.Described reference signal collecting unit 34 and signal adaptive are eliminated unit 35 and are connected, for gathering motion reference signal, wherein reference signal collecting unit is generally acceleration transducer, and this acceleration transducer can gather the motion reference signal of simulation usually, the motion reference signal of numeral also can be gathered; And the motion reference signal demand of collection simulation is through analog-converted process, be converted to digital moving reference signal; Described signal adaptive is eliminated unit 35 and is connected with described interference magnitude judging unit 33, for the size according to interference magnitude, carries out self adaptation elimination to exercise electrocardiogram signal and motion reference signal; Described electrocardiosignal acquiring unit 37 eliminates unit 35 with described signal adaptive respectively and interference magnitude judging unit 33 is connected, and for the size according to interference magnitude, obtains electrocardiosignal.
Refer to Fig. 4, a kind of device eliminating exercise electrocardiogram signal interference provided by the invention, wherein amplifies and comprises amplification module 311 and low-pass filtering treatment module 312 with low-pass filtering list 31 yuan; Described amplification module 30 is connected with exercise ECG collecting unit 311, and for being fixed the processing and amplifying of gain to the exercise electrocardiogram signal gathered, wherein amplification module is preferably amplifier; Described low-pass filtering treatment module 312 is connected with described amplification module 311, for carrying out low-pass filtering treatment to the exercise electrocardiogram signal after processing and amplifying; Described analog digital conversion and filter unit 32 comprise module converts module 321 and Filtering Processing module 322; Described analog-to-digital conversion module 321 is connected with low-pass filtering treatment module 312, for carrying out analog digital conversion to exercise electrocardiogram signal, skimulated motion electrocardiosignal is converted to digital moving electrocardiosignal; Described Filtering Processing module 322 is connected with described analog-to-digital conversion module 321, for carrying out high-pass filtering and low-pass filtering treatment to the digital moving electrocardiosignal after conversion; Wherein carry out high-pass filtering and low-pass filtering treatment uses high pass filter and low pass filter to process usually, and high pass filter is preferably the lower high pass filter of cut-off frequency, be conducive to the background signal removing slowly change like this, low pass filter is mainly used for the bandwidth of constrained motion electrocardiosignal simultaneously, thus reduces the noise of exercise electrocardiogram signal; Described interference magnitude judging unit 33 comprises bandpass filtering treatment module 331, Integral Processing module 332 and interference magnitude judge module 333; Described bandpass filtering treatment module 331 is connected with described analog digital conversion and filter unit 32, for carrying out bandpass filtering treatment to the digital moving electrocardiosignal after analog digital conversion and Filtering Processing, obtains motion disturbance signals; Described Integral Processing module 332 is connected with described bandpass filtering treatment module 331, for carrying out cumulative summation process to the motion disturbance signals in a period of time, obtains interference magnitude value; Described interference magnitude judge module 333 is connected with described Integral Processing module 332, for interference magnitude value and the interference magnitude threshold value preset being compared, judges the size of motion artifacts amplitude; When interference magnitude value is greater than default interference magnitude threshold value, then judge that motion artifacts amplitude is large; When interference magnitude value is less than default interference magnitude threshold value, then judge that motion artifacts amplitude is little; When judging motion artifacts amplitude hour, electrocardiosignal acquiring unit 37 directly obtains exercise electrocardiogram signal.
Refer to Fig. 5, a kind of device eliminating exercise electrocardiogram signal interference provided by the invention, wherein signal adaptive elimination unit 35 comprises exercise electrocardiogram signal shunt module 350, motion reference signal shunt module 351, QRS complex wave detection module 352, first Postponement module 353, second Postponement module 354, phse conversion module 355, asks differential mode block 356, weighted sum module 357 and right value update module 358; Described signal adaptive is eliminated unit 35 and is eliminated for the self adaptation of carrying out exercise electrocardiogram signal and motion reference signal according to motion artifacts amplitude size, and when judging that motion artifacts amplitude is little, shutdown signal self adaptation eliminates unit 35; When judging motion artifacts amplitude greatly, enabling signal self adaptation eliminates unit 35; Described exercise electrocardiogram signal shunt module 350, exports for exercise electrocardiogram signal being divided into the identical exercise electrocardiogram signal of two-way; Described motion reference signal shunt module 351, exports for motion reference signal being divided into the identical motion reference signal of two-way; Described QRS complex wave detection module 352 is connected with described exercise electrocardiogram signal shunt module 350, for carrying out QRS complex wave check processing to a road exercise electrocardiogram signal; Described first Postponement module 353 is connected with described exercise electrocardiogram signal shunt module 350, for carrying out delay disposal to the exercise electrocardiogram signal on another road; Described phse conversion module 355 is connected with described motion reference signal shunt module 351, for carrying out phase shift transform to a road motion reference signal; Described second Postponement module 354 is connected with described motion reference signal shunt module 351, for carrying out delay disposal to another road motion reference signal, and Shi Gai road motion reference signal and the motion reference signal synchronism output carried out after phase shift transform; Described weighted sum module 357 is connected with described second Postponement module 354 and described phse conversion module 355 respectively, for being weighted summation process to two-way motion reference signal, obtaining and estimates motion reference signal; Described differential mode block 356 of asking is connected with described first Postponement module 353 and weighted sum module 357 respectively, for the exercise electrocardiogram signal after delay disposal with estimate motion reference signal and carry out asking difference to process, obtain difference signal, export after stabilized treatment after a while; Described right value update module 358 respectively with described QRS complex wave detection module 352, described in ask differential mode block 356 and described weighted sum module 357 to be connected, for the weight coefficient to weighted sum module upgrades according to difference signal and QRS complex wave check processing result.
Wherein, exercise electrocardiogram signal comprises QRS wave band and non-QRS wave band, carries out check processing at QRS wave band by QRS complex wave detection module 352; And QRS complex wave detection module 352 and the first Postponement module 353 have identical delay, the exercise electrocardiogram signal on Ji Gai road can with the electrocardiosignal synchronism output by the first Postponement module 353.Then the exercise electrocardiogram signal after QRS complex wave detection module 352 processes is being exported to right value update module 358; And at non-QRS wave band, right value update module 358 obtains difference signal, then with acquisition QRS complex wave check processing result, weight coefficient is upgraded, so that can better pursuit movement interfering signal.
The invention provides a kind of elimination exercise electrocardiogram signal interference method and device, human motion reference signal is gathered by arranging acceleration transducer, the baseline drift signal in motion reference signal and exercise ECG waveform is utilized to have identical variation tendency, realize motion reference signal can adaptively offset with the baseline drift interfering signal in exercise electrocardiogram signal, thus the exercise electrocardiogram signal after the motion artifacts that is eliminated; Wherein the present invention is compared with the prior art, the advantage had and beneficial effect are: 1, adopt acceleration transducer, the motion reference signal of Real-time Collection human body, utilizes the baseline drift interfering signal in motion reference signal and exercise electrocardiogram signal, can obtain good exercise electrocardiogram signal; 2, the interference magnitude threshold value preset and interference value threshold value compare, and can judge whether carry out adaptive Interference Cancellation preferably; Improve accuracy and the stability of Interference Cancellation; Even if 3, of the present invention a kind of eliminate exercise electrocardiogram signal interference method and device when motion artifacts amplitude is very large, still the counteracting of exercise electrocardiogram signal and motion reference signal can be passed through, obtain good exercise electrocardiogram signal, to facilitate the follow-up analyzing and processing for ecg wave form.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. eliminate a method for exercise electrocardiogram signal interference, comprise the steps:
Gather exercise electrocardiogram signal and motion reference signal;
The carrying out of the exercise electrocardiogram signal fixed gain gathered is amplified and low-pass filtering treatment;
Analog-to-digital conversion process is carried out to the exercise electrocardiogram signal after amplification and low-pass filtering treatment, obtains the exercise electrocardiogram signal of numeral;
The judgement of motion artifacts amplitude is carried out to the exercise electrocardiogram signal of numeral, judges the size of motion artifacts amplitude;
According to the size of motion artifacts amplitude, self adaptation elimination is carried out to exercise electrocardiogram signal and motion reference signal, obtain the exercise electrocardiogram signal of filtering interfering;
It is characterized in that, when judging that motion artifacts amplitude is large, self adaptation elimination being carried out to exercise electrocardiogram signal and reference signal; Described to exercise electrocardiogram signal and step that motion reference signal carries out self adaptation elimination comprise: the motion reference signal of collection is divided into the identical motion reference signal of two-way and exports; Phase shift transform is carried out to the motion reference signal on a road, obtains the motion reference signal after phase shift transform; Delay disposal is carried out to another road motion reference signal, Shi Gai road motion reference signal and the motion reference signal synchronism output carried out after phase shift transform; Again summation process is weighted to this two-way motion reference signal, obtains and estimate motion reference signal; The exercise electrocardiogram signal of collection is divided into the identical exercise electrocardiogram signal of two-way to export; QRS complex wave check processing is carried out to a road exercise electrocardiogram signal; Delay disposal is carried out to another road exercise electrocardiogram signal, the exercise electrocardiogram signal on Shi Gai road with estimate motion reference signal synchronism output; To the exercise electrocardiogram signal after delay disposal with estimate motion reference signal ask difference process, acquisition filtering interfering exercise electrocardiogram signal;
Wherein, described exercise electrocardiogram signal is obtained by cardiac diagnosis lead-line, and described motion reference signal is obtained by acceleration transducer.
2. a kind of method eliminating exercise electrocardiogram signal interference according to claim 1, is characterized in that, after obtaining the exercise electrocardiogram signal of numeral, also comprise and carry out high-pass filtering process and low-pass filtering treatment to the exercise electrocardiogram signal of numeral.
3. a kind of method eliminating exercise electrocardiogram signal interference according to claim 1 and 2, is characterized in that, the described size to motion artifacts amplitude is carried out judgement and comprised and carry out bandpass filtering treatment to digital exercise electrocardiogram signal, obtains motion disturbance signals; Carry out cumulative summation carrying out signal to the motion disturbance signals in a period of time, obtain interference magnitude value; Interference magnitude value and the interference magnitude threshold value preset are compared, judges the size of motion artifacts amplitude; When interference magnitude value is greater than default interference magnitude threshold value, then judge that motion artifacts amplitude is large; When interference magnitude value is less than default interference magnitude threshold value, then judge that motion artifacts amplitude is little.
4. a kind of method eliminating exercise electrocardiogram signal interference according to claim 1, is characterized in that, when judging the motion artifacts amplitude hour of exercise electrocardiogram signal, directly obtaining exercise electrocardiogram signal.
5. a kind of method eliminating exercise electrocardiogram signal interference according to claim 1, it is characterized in that, described to exercise electrocardiogram signal and step that motion reference signal carries out self adaptation elimination also comprise, result and the weight coefficient of QRS complex wave check processing result to weighted sum process according to asking difference process upgrade.
6. one kind realizes the device of elimination exercise electrocardiogram signal interference method according to claim 1, comprise the exercise ECG collecting unit gathering exercise electrocardiogram signal, gather the reference signal collecting unit of motion reference signal, exercise electrocardiogram signal is amplified and low-pass filtering treatment the amplification be connected with exercise ECG collecting unit and low-pass filter unit, the exercise electrocardiogram signal of simulation is converted to digital exercise electrocardiogram signal and the AD conversion unit be connected with amplification and low-pass filter unit, the size of the interference magnitude of exercise electrocardiogram signal is judged and the interference magnitude judging unit be connected with AD conversion unit and the size according to interference magnitude, self adaptation elimination is carried out to exercise electrocardiogram signal and motion reference signal and the signal adaptive be connected with interference magnitude judging unit with reference signal collecting unit respectively eliminates unit, it is characterized in that,
Described signal adaptive is eliminated unit and is comprised exercise electrocardiogram signal shunt module, motion reference signal shunt module, QRS complex wave detection module, the first Postponement module, the second Postponement module, phse conversion module, asks differential mode block and weighted sum module; Described exercise electrocardiogram signal shunt module, exports for exercise electrocardiogram signal being divided into the identical exercise electrocardiogram signal of two-way; Described motion reference signal shunt module, exports for motion reference signal being divided into the identical motion reference signal of two-way; Described QRS complex wave detection module is connected with described exercise electrocardiogram signal shunt module, for carrying out QRS complex wave check processing to a road exercise electrocardiogram signal; Described first Postponement module is connected with described exercise electrocardiogram signal shunt module, for carrying out delay disposal to the exercise electrocardiogram signal on another road; Described phse conversion module is connected with described motion reference signal shunt module, for carrying out phase shift transform to a road motion reference signal; Described second Postponement module is connected with described motion reference signal shunt module, for carrying out delay disposal to another road motion reference signal; Described weighted sum module is connected with described second Postponement module and described phse conversion module respectively, for being weighted summation process to two-way motion reference signal, obtaining and estimates motion reference signal; Described differential mode block of asking is connected with described first Postponement module and weighted sum module respectively, for the exercise electrocardiogram signal after delay disposal with estimate motion reference signal and carry out asking difference process, the exercise electrocardiogram signal of acquisition filtering interfering;
Wherein, described exercise ECG collecting unit is cardiac diagnosis lead-line, and described reference signal collecting unit is acceleration transducer.
7. a kind of device eliminating exercise electrocardiogram signal interference according to claim 6, it is characterized in that, between AD conversion unit and interference magnitude judging unit, also comprise the filter processing unit for carrying out high-pass filtering and low-pass filtering treatment to digital exercise electrocardiogram signal.
8. a kind of device eliminating exercise electrocardiogram signal interference according to claim 6 or 7, it is characterized in that, described interference magnitude judging unit comprises bandpass filtering treatment module, Integral Processing module and interference magnitude judge module; Described bandpass filtering treatment module is connected with described AD conversion unit, for carrying out bandpass filtering treatment to digital exercise electrocardiogram signal, obtains motion disturbance signals; Described Integral Processing module is connected with described bandpass filtering treatment module, for carrying out cumulative summation process to the motion disturbance signals in a period of time, obtains interference magnitude value; Described interference magnitude judge module is connected with described Integral Processing module, for interference magnitude value and the interference magnitude threshold value preset being compared, judges the size of motion artifacts amplitude.
9. a kind of device eliminating exercise electrocardiogram signal interference according to claim 6, is characterized in that, described signal adaptive is eliminated unit and also comprised right value update module; Described right value update module respectively with described QRS complex wave detection module, described in ask differential mode block and described weighted sum module to be connected, for the weight coefficient to weighted sum module upgrades according to difference signal and QRS complex wave check processing result.
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