CN102988036A - Method for measuring pulse rate - Google Patents
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- CN102988036A CN102988036A CN2012105754190A CN201210575419A CN102988036A CN 102988036 A CN102988036 A CN 102988036A CN 2012105754190 A CN2012105754190 A CN 2012105754190A CN 201210575419 A CN201210575419 A CN 201210575419A CN 102988036 A CN102988036 A CN 102988036A
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Abstract
The invention provides a method for measuring pulse rate. The method comprises the steps of using a pulse sensor to acquire a time domain pulse signal; obtaining first pulse rate n1 according to the time domain pulse signal acquired by the pulse sensor; performing Fourier transform to the time domain pulse signal to obtain a frequent domain pulse signal; confirming a wave crest corresponding value of the frequency domain pulse signal in a frequency range from 0.65Hz-3.20Hz, namely a pulse frequency value, and obtaining a second pulse rate n2 through the pulse rate; and calculating final pulse rate of a tested object in unit time through the first pulse rate n1 and the second pulse rate n2. The method for measuring the pulse rate integrates a time domain analyzing method and a frequency domain analyzing method, uses acceleration information to perform feedback adjustment and control to a pulse value, and accordingly obtains accurate and reliable pulse information.
Description
Technical field
The present invention relates to the medical device field, relate in particular to a kind of method of measuring pulse frequency.
Background technology
Pulse signal is a kind of faint physiological signal of non-linear, non-stationary, and the integrated information of the aspects such as the form that the ripple of fighting presents, intensity, speed and the rhythm and pace of moving things can reflect the flow characteristic of many physiological and pathologicals in the cardiovascular system of human body.Often it is detected analysis, can reach prevention morning of cardiovascular disease and the purpose of early treatment.At present, no matter be Traditional Chinese Medicine or modern doctor trained in Western medicine, in the inspection to cardiovascular disease, all its wave character and change important evidence as evaluation cardiovascular system of human body physiology, pathological state.
Pulse frequency is carried out feature extraction in time domain to pulse signal mostly by static measurement at present.Temporal analysis carries out feature extraction to the pulse wave time-domain signal, calculates the per minute Pulse Rate, i.e. pulse frequency, and the advantage of his maximum is exactly that speed is fast, and real-time is high, meets the demands easily.Yet Time-Domain algorithm is very high to the prescription of signal, and is lower in the pulse signal quality, especially under the kinestate, adopts method of the prior art can not satisfy the Measurement accuracy pulse frequency.In addition, the Static Detection correspondence has significant limitation, if continuous record human body pulse frequency dynamically, will inevitably disclose some rule of human vas pathological changes, is more convenient for simultaneously monitoring healthy in people's daily life.
Summary of the invention
The technical problem that (one) will solve
For solving above-mentioned one or more problems, the invention provides a kind of method of measuring pulse frequency, to obtain exactly pulse frequency information.
(2) technical scheme
According to an aspect of the present invention, provide a kind of method of measuring pulse frequency.The method of this measurement pulse frequency comprises: gather the time domain pulse signal by pulse transducer; Time domain pulse signal according to the pulse transducer collection obtains the first pulse frequency n
1The time domain pulse signal is carried out Fourier transformation, obtain the frequency domain pulse signal; For the frequency domain pulse signal, determine its crest respective value in the 0.65Hz-3.20Hz frequency range, namely the pulse frequency value obtains the second pulse frequency n by this pulse frequency
2And by the first pulse frequency n
1With the second pulse frequency n
2Calculate the final pulse frequency of the unit interval of tested object: N=n
1* w
1+ n
2* w
2, wherein, w
1+ w
2=1, w
1And w
2Be respectively the weight of the first pulse frequency and the second pulse frequency, the acceleration statistical value class of living in of tested object is higher, the weight w of the second pulse frequency
2Larger.
(3) beneficial effect
Can find out that from technique scheme the method that the present invention measures pulse frequency has following beneficial effect:
(1) temporal analysis is combined with frequency domain analysis, and with acceleration information the pulse value is carried out feedback regulation, thereby the pulse information that obtains more accurately, reliably;
(2) can be under motion conditions and acquired signal situation of low quality under the measurement pulse frequency, stable performance, the result is accurate.
Description of drawings
Fig. 1 is the flow chart of measuring the pulse frequency method according to the embodiment of the invention;
Fig. 2 is in the described measurement pulse frequency of Fig. 1 method, is identified the sketch map of pulse wave by pulse wave master crest (A), dicrotic notch crest (B), dicrotic wave crest (C) and dicrotic wave trough (D).
The specific embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
Need to prove that in accompanying drawing or description description, similar or identical part is all used identical figure number.The implementation that does not illustrate in the accompanying drawing or describe is form known to a person of ordinary skill in the art in the affiliated technical field.In addition, although this paper can provide the demonstration of the parameter that comprises particular value, should be appreciated that parameter need not definitely to equal corresponding value, but can in acceptable error margin or design constraint, be similar to corresponding value.
In one exemplary embodiment of the present invention, provide a kind of method of measuring pulse frequency.As shown in Figure 1, this measurement pulse frequency method comprises:
Steps A is by the pulse transducer time domain pulse signal of collection 2s time;
This pulse transducer is installed with in the position of tested object pulse, such as chest, wrist, finger etc., the pulse of the tested object of Real-time Collection.Preferably, this pulse transducer is attached at tested object chest, carries out the pulse frequency monitoring with convenient tested object under kinestate.
In this step, the sampling duration of time domain pulse signal is 1-2s, and 2s is more quite a lot of, and sample frequency is fixed because for frequency domain algorithm, and sampling number is more, and frequency resolution is higher.Comprehensive requirement of real-time again, 2s is more quite a lot of.Certainly, in the not high situation of requirement of real-time, also can the proper extension data acquisition time, such as: 4s, 8s, 10s, 20s, 60s etc.
Step B, the acceleration signal of synchronous acquisition 2s is measured tested object at the acceleration of X, Y and three directions of Z: a by 3-axis acceleration sensor
x, a
yAnd a
z,, counting of collection is n; Then add up the value of three axial acceleration in [3,3], [6,6], [10,10], [15,15], counting between [20,20] is designated as respectively a
X1, a
X2, a
X3, a
X4, a
X5a
Y1, a
Y2, a
Y3, a
Y4, a
Y5a
Z1, a
Z2, a
Z3, a
Z4, a
Z5A wherein
X1, a
X2, a
X3, a
X4, a
X5For tested object at the acceleration of directions X respectively at [a1, a1], [a2, a2], [a3, a3], [a4, a4], counting between [a5, a5]; a
Y1, a
Y2, a
Y3, a
Y4, a
Y5For tested object at the acceleration of Y-direction respectively at [a1, a1], [a2, a2], [a3, a3], [a4, a4], counting between [a5, a5]; a
Z1, a
Z2, a
Z3, a
Z4, a
Z5For tested object at the acceleration of Z direction respectively at [a1, a1], [a2, a2], [a3, a3], [a4, a4], counting between [a5, a5].
In the present embodiment, the 3-axis acceleration sensor of employing can obtain the acceleration of tested object on three directions.It will be apparent to those skilled in the art that also and can adopt the sensor that can obtain the one direction acceleration, and needn't strictly distinguish three directions, thereby reduce cost.
In this enforcement, pulse transducer and 3-axis acceleration sensor are integrated on the equipment.
Step C judges that tested object is at the acceleration of X, Y and three directions of the Z statistical value a at the 5th class
X5, a
Y5, a
Z5Whether all greater than predetermined threshold value T
Min, if so, execution in step D, otherwise, re-execute steps A;
Generally, this predetermined threshold value T
MinGet 0.8n, n is for once gathering the number of acceleration information on each axle.In this step, a
X5, a
Y5, a
Z5Whether all greater than predetermined threshold value T, limit exactly acceleration and surpass [20,20] interval ratio data less than 0.2n, also just be equivalent to accekeration and be greater than 0.8n in [20,20] interval ratio.
Experiment showed, to surpass [20,20] interval ratio by acceleration more large-signal is poorer that signal just can not have been differentiated when surpassing 0.2n, the follow-up pulse value that draws will be very inaccurate.Therefore, the acceleration restriction of tested object is very necessary within the specific limits, otherwise will need resampling.
Step D, employing free transmission range are that the band filter of 0.65Hz-3.20Hz carries out filtering to the time domain pulse signal;
In the prior art, usually adopt the method for wavelet filtering that the time domain pulse signal is carried out filtering, but Wavelets Filtering Algorithm is comparatively complicated, holding time is long.And method processing procedure of the present invention is simple, and the time is short, is conducive to the Real-time Collection pulse data.
Step e to the time domain pulse signal, is identified each pulse wave by crest and the trough of pulse wave master ripple, dicrotic notch and dicrotic wave, obtains the first pulse frequency n according to the time domain pulse signal that gathers
1
As shown in Figure 2, adopt and identify pulse wave by the crest (C) of pulse wave master crest (A), dicrotic notch crest (B), dicrotic wave and the trough (D) of dicrotic wave, its advantage is to realize accurate identification.It will be apparent to those skilled in the art that and also can take the mode of Direct Recognition pulse wave master ripple to identify pulse wave, doing like this accuracy rate can be slightly poor, but can't affect enforcement of the present invention.
Step F is carried out Fourier (FFT) conversion with the time domain pulse signal, obtains the frequency domain pulse signal;
Step G for the frequency domain pulse signal, determines its crest respective value in the 0.65Hz-3.20Hz frequency range, and namely the pulse frequency value obtains the second pulse frequency n by this pulse frequency
2
Experiment showed, that the maximum characteristics of utilizing frequency domain method to carry out pulses measure are exactly good stability, capacity of resisting disturbance is strong, and still, if simple proportion method can make the real-time variation again, so present embodiment adopts the pulse algorithm of time-frequency mixing.
Step H utilizes following formula, by the first pulse frequency n
1With the second pulse frequency n
2Calculate the final pulse frequency of the unit interval of tested object:
N＝n
1×w
1+n
2×w
2
Wherein, w
1And w
2Be respectively the weight of the first pulse frequency and the second pulse frequency, both are relevant at each interval statistical value at the acceleration of X, Y and three directions of Z with tested object, and both sums are 1.
In the present embodiment, the present invention's degree of will speed up is divided into five class statistics, is respectively [3,3], and [6,6], [10,10], [15,15], [20,20] are again according to three axial acceleration statistical value a on each class
X1, a
X2, a
X3, a
X4, a
X5a
Y1, a
Y2, a
Y3, a
Y4, a
Y5a
Z1, a
Z2, a
Z3, a
Z4, a
Z5, and the sampling n that always counts determines the weights of corresponding the first pulse frequency and the second pulse frequency:
As min (a
X1, a
Y1, a
Z1During) 〉=0.8n, w
1=0.9, w
2=0.1;
Be false but min (a when above
X2, a
Y2, a
Z2During) 〉=0.8n, w
1=0.7, w
2=0.3;
Be false but min (a when above
X3, a
Y3, a
Z3During) 〉=0.8n, w
1=0.5, w
2=0.5;
Be false but min (a when above
X4, a
Y4, a
Z4During) 〉=0.8n, w
1=0.3, w
2=0.7;
Be false but min (a when above
X5, a
Y5, a
Z5During) 〉=0.8n, w
1=0.1, w
2=0.9.
So far, present embodiment is measured the end of pulse frequency process.
The invention provides a kind ofly applicable in people's daily life, especially under motion conditions, measure the method for pulse frequency.The data that the method utilizes the pulse transducer collection to come up in conjunction with the acceleration information of a 3-axis acceleration sensor, combine the calculating Pulse Rate with time domain pulse information and frequency domain pulse information again.The present invention has substantial degradation to the pulse prescription, and stable performance is calculated simply, and the result of calculation of pulse is also more accurate.
Need to prove that above-mentioned definition to each element is not limited in various concrete structures or the shape of mentioning in the embodiment, those of ordinary skill in the art can replace simply to it with knowing, for example:
The weighted value of (1) first pulse frequency and the second pulse frequency can be adjusted as required;
(2) number of acceleration class, upper lower limit value wherein can be adjusted as required;
(3) 3-axis acceleration sensor can replace with other multiaxis acceleration transducers.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a method of measuring pulse frequency is characterized in that, comprising:
Gather the time domain pulse signal by pulse transducer;
Described time domain pulse signal according to the pulse transducer collection obtains the first pulse frequency n
1
Described time domain pulse signal is carried out Fourier transformation, obtain the frequency domain pulse signal;
For described frequency domain pulse signal, determine its crest respective value in the 0.65Hz-3.20Hz frequency range, namely the pulse frequency value obtains the second pulse frequency n by this pulse frequency
2And
By described the first pulse frequency n
1With described the second pulse frequency n
2Calculate the final pulse frequency of the unit interval of tested object: N=n
1* w
1+ n
2* w
2, wherein, w
1+ w
2=1, w
1And w
2Be respectively the weight of the first pulse frequency and the second pulse frequency, it is higher that the acceleration of tested object is added up class of living in, the weight w of the second pulse frequency
2Larger.
2. method according to claim 1 is characterized in that, the acceleration of described tested object is by the acceleration transducer collection, and collection also comprises afterwards to be added up the acceleration of the tested object that gathers.
3. method according to claim 2 is characterized in that,
The acceleration that described acceleration transducer gathers tested object comprises: gather tested object at the acceleration of X, Y and three directions of Z: a by 3-axis acceleration sensor
x, a
yAnd a
z,, counting of collection is n;
Described acceleration to the tested object that gathers is added up and is comprised: add up tested object at the acceleration of X, Y and three directions of Z at 5 class [a1, a1], [a2, a2], [a3, a3], [a4, a4], counting between [a5, a5] is designated as respectively a
X1, a
X2, a
X3, a
X4, a
X5a
Y1, a
Y2, a
Y3, a
Y4, a
Y5a
Z1, a
Z2, a
Z3, a
Z4, a
Z5, a1＜a2＜a3＜a4＜a5 wherein.
4. method according to claim 3 is characterized in that, and is described by the first pulse frequency n
1With the second pulse frequency n
2Calculate in the step of final pulse frequency of unit interval of tested object:
As min (a
X1, a
Y1, a
Z1During) 〉=0.8n, w
1=0.9, w
2=0.1;
Be false but min (a when above
X2, a
Y2, a
Z2During) 〉=0.8n, w
1=0.7, w
2=0.3;
Be false but min (a when above
X3, a
Y3, a
Z3During) 〉=0.8n, w
1=0.5, w
2=0.5;
Be false but min (a when above
X4, a
Y4, a
Z4During) 〉=0.8n, w
1=0.3, w
2=0.7; And
Be false but min (a when above
X5, a
Y5, a
Z5During) 〉=0.8n, w
1=0.1, w
2=0.9.
5. method according to claim 4 is characterized in that, described described time domain pulse signal according to the pulse transducer collection obtains the first pulse frequency n
1Step before also comprise:
Judge that tested object is at the acceleration of X, Y and three directions of the Z statistical value a at [a5, a5]
X5, a
Y5, a
Z5Whether all greater than predetermined threshold value T
Min, if not, again gather the time domain pulse signal by pulse transducer.
6. method according to claim 5 is characterized in that, described T
Min=0.8n;
7. method according to claim 6 is characterized in that, described a1=3; A2=6; A3=10; A4=15; A5=20;
8. each described method in 5 according to claim 1 is characterized in that described described time domain pulse signal according to the pulse transducer collection obtains the first pulse frequency n
1Step comprise:
To the time domain pulse signal, identify each pulse wave by crest and the trough of pulse wave master ripple, dicrotic notch and dicrotic wave, obtain the first pulse frequency n wave period by pulse
1
9. each described method in 5 according to claim 1 is characterized in that described time domain pulse signal according to the pulse transducer collection obtains the first pulse frequency n
1Step before also comprise:
Adopt band filter that described time domain pulse signal is carried out filtering, the free transmission range of this band filter is 0.65Hz-3.20Hz.
10. each described method in 5 according to claim 1 is characterized in that, in the described step that is gathered the time domain pulse signal by pulse transducer, the duration of time domain pulse signal is between between the 1s to 2s.
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