CN106994010A - A kind of heart rate detection method and system based on PPG signals - Google Patents
A kind of heart rate detection method and system based on PPG signals Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
- A61B5/02416—Detecting, measuring or recording pulse rate or heart rate using photoplethysmograph signals, e.g. generated by infrared radiation
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
- A61B5/7207—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal of noise induced by motion artifacts
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7235—Details of waveform analysis
- A61B5/7253—Details of waveform analysis characterised by using transforms
- A61B5/7257—Details of waveform analysis characterised by using transforms using Fourier transforms
Abstract
The invention provides a kind of heart rate detection method based on PPG signals and system, it is related to medical communication technical field.This method includes：Corresponding heart rate waveform is exported according to the changes in heart rate of human body to be measured using PPG sensors；Fourier transformation is carried out to heart rate waveform, to obtain heart rate frequency spectrum corresponding with heart rate waveform；Three tops are positioned in the heart rate frequency range of heart rate frequency spectrum, and the frequency corresponding to three tops is compared with a preceding heart rate, frequency are regard as Current heart rate peak closest to the heart rate peak of a preceding heart rate；Exported the frequency corresponding to Current heart rate peak as the Current heart rate of human body to be measured.The present invention can overcome the problem of can not eliminating continuous motion artifacts present in prior art, and accurate heart rate can be also calculated under the interference of prolonged persistent movement.
Description
Technical field
The invention belongs to rhythm of the heart technical field, more particularly to a kind of heart rate detection side based on PPG signals
Method and system.
Background technology
Heart rate refers to the number of times of human heart pollex per minute, and in human parameters detection, heart rate is one non-
Often important physical signs, reference is provided for medical diagnosis.Meanwhile, heart rate can also be used as human motion physiology
The objective evaluation index of load, has been widely used in body building, the various aspects of athletics and physical training.
At present, heart rate monitor still has many limitations, and finger-clipped rhythm of the heart needs measured to be protected in measurement
Hold static, ECG electrode rhythm of the heart needs electrode slice being affixed on skin retention device monitor heart rate, it is difficult to full
The requirement of sufficient future electronic health monitoring, wearable device etc., therefore the heart rate data of people is extracted whenever and wherever possible
Just it is particularly important.
PPG (Photo Plethysmo Graphy, photoplethysmographic graphical method) is by photoelectricity means
A kind of non-invasive detection methods of volumetric blood change are detected in biological tissue.When the light beam of certain wavelength irradiates
During to skin surface, the light velocity will be sent to photelectric receiver by way of transmission-type or reflection, in this process
In, due to the attenuation by absorption effect by integumentary musculature and blood, the luminous intensity that detector is detected will weaken,
Wherein the absorption to light such as skin, muscle, tissue be to maintain in whole blood circulation it is invariable, and
Volumetric blood in skin changes under action of the heart in pulsation.When the heart contracts, external perihaemal canal blood
At most, absorbing amount is also maximum for capacity, and the luminous intensity detected is minimum；And in diastole, peripheral blood
Pipe blood volume is minimum, and the luminous intensity detected is maximum, and the luminous intensity for detecting photelectric receiver is in arteries and veins therewith
Dynamic formula changes.The signal of this intensity variation is converted into electric signal, volume pulse blood just can be obtained
Change, heart rate can be by analyzing calculating and obtaining to the rhythm and pace of moving things of electric signal, cycle, amplitude.PPG sensors
It is generally smaller, it is desirably integrated into wearable device.It is therefore possible to use wearable device by collection,
Analysis, the heart rate of processing PPG signal acquisition human bodies.
However, many challenges are still had by handling PPG signal of change hearts rate, because PPG signals are
From the bio signal of surface extraction, its signal intensity is weak, be easily disturbed, industrial frequency noise, ambient noise with
And motion artifacts can cause very big influence to the signal quality of collection, and it is difficult to filter out.Wherein, move
Noise jamming is caused by organizing interference, venous blood volume and change in optical path length in motion, because motion is made an uproar
The main frequency of sound can overlap with the frequency of heart rate under many circumstances, in a variety of noises, most be difficult to
Eliminate.
At present, along with the rise of wearable device, people study and propose some and eliminate in PPG signals
The scheme of motion artifacts, for example, using methods such as adaptive-filtering, wavelet analysis or independent component analysis
PPG signals are analyzed, and then calculating obtains heart rate, these schemes are for dry because moving in time domain
Disturb and the PPG signals of distortion are analyzed, and attempt to reconstruct the waveform produced with changes in heart rate, then basis
The waveshape of reconstruct obtains heart rate.The deficiency of these schemes is, due to the time span of the waveform of reconstruct
It is limited, therefore it can only restore when moving the short time and compare clearly waveform, be usually no more than 5
Second；And once run duration is more than 5 seconds, then the validity of the waveform after its reconstruct can then be substantially reduced, and be entered
And make it that the heart rate error that calculating is obtained is larger.
To sum up, the scheme of motion artifacts can not be eliminated in the above-mentioned elimination PPG signals proposed in the prior art
Continuous motion artifacts, it is impossible to accurate heart rate is obtained under continuous motion artifacts.
The content of the invention
The purpose of the embodiment of the present invention is offer a kind of heart rate detection method and system based on PPG signals,
Aiming to solve the problem that the scheme of motion artifacts in the above-mentioned elimination PPG signals proposed in the prior art can not eliminate
Continuous motion artifacts, it is impossible to the problem of obtaining accurate heart rate under continuous motion artifacts.
The embodiment of the present invention is achieved in that a kind of heart rate detection method based on PPG signals, including：
Corresponding heart rate waveform is exported according to the changes in heart rate of human body to be measured using PPG sensors；
Fourier transformation is carried out to the heart rate waveform, to obtain heart rate frequency spectrum corresponding with the heart rate waveform；
Three tops are positioned in the heart rate frequency range of the heart rate frequency spectrum, and three tops institute is right
The frequency answered is compared with a preceding heart rate, using frequency closest to the heart rate peak of a preceding heart rate as current
Heart rate peak；
Exported the frequency corresponding to the Current heart rate peak as the Current heart rate of the human body to be measured.
In the heart rate detection method based on PPG signals described in the embodiment of the present invention, in the heart rate frequency spectrum
Heart rate frequency range in three tops of positioning, and by the frequency corresponding to three tops and a preceding heart
Rate is compared, using frequency closest to the heart rate peak of a preceding heart rate as Current heart rate peak after also include：
Calculate the frequency corresponding to the Current heart rate peak and the difference of a preceding heart rate；
Judge whether the difference is more than preset value；
If the difference is more than the preset value, give up the frequency corresponding to the Current heart rate peak, and will
A preceding heart rate is exported as Current heart rate；
If the difference is less than or equal to the preset value, the frequency corresponding to the Current heart rate peak is made
Exported for the Current heart rate of the human body to be measured.
In the heart rate detection method based on PPG signals described in the embodiment of the present invention, the preset value is
30bpm。
In the heart rate detection method based on PPG signals described in the embodiment of the present invention, the use PPG
Sensor also includes after exporting corresponding heart rate waveform according to the changes in heart rate at human body appointed part to be measured：
Monitor whether the human body to be measured remains static using motion sensor, if at the human body to be measured
In inactive state, then the heart rate waveform directly exported according to the PPG sensors calculates the human body to be measured
Heart rate, and the heart rate is independently exported as Current heart rate.
In the heart rate detection method based on PPG signals described in the embodiment of the present invention, the PPG sensings
Device is reflective or transmission-type PPG sensors.
The another object of the embodiment of the present invention is to provide a kind of heart rate detection system based on PPG signals, bag
Include：
PPG sensors, for exporting corresponding heart rate waveform according to the changes in heart rate of human body to be measured；
FFT module, for carrying out Fourier transformation to the heart rate waveform, to obtain and the heart rate
The corresponding heart rate frequency spectrum of waveform；
Heart rate peak locating module, for positioning three tops in the heart rate frequency range of the heart rate frequency spectrum, and
Frequency corresponding to three tops is compared with a preceding heart rate, by frequency closest to it is preceding once
The heart rate peak of heart rate is used as Current heart rate peak；
Heart rate output module, for regarding the frequency corresponding to the Current heart rate peak as the human body to be measured
Current heart rate is exported.
In the heart rate detection system based on PPG signals described in the embodiment of the present invention, in addition to error calculation
Module, is used for：
Calculate the frequency corresponding to the Current heart rate peak and the difference of a preceding heart rate；
Judge whether the difference is more than preset value；
If the difference is more than the preset value, the heart rate output module is controlled to give up the Current heart rate
Frequency corresponding to peak, and a preceding heart rate is exported as Current heart rate；
If the difference is less than or equal to the preset value, control the heart rate output module will be described current
Frequency corresponding to heart rate peak is exported as the Current heart rate of the human body to be measured.
In the heart rate detection system based on PPG signals described in the embodiment of the present invention, the preset value is
30bpm。
In the heart rate detection system based on PPG signals described in the embodiment of the present invention, in addition to：
Motion sensor, for monitoring whether the human body to be measured remains static, if the human body to be measured
Remain static, then the heart rate waveform for controlling the heart rate output module to be exported according to the PPG sensors
The heart rate of the human body to be measured is calculated, and the heart rate is independently exported as Current heart rate.
In the heart rate detection system based on PPG signals described in the embodiment of the present invention, the PPG sensings
Device is reflective or transmission-type PPG sensors.
Implementing a kind of heart rate detection method and system based on PPG signals provided in an embodiment of the present invention has
Following beneficial effect：
The embodiment of the present invention due to using PPG sensors according to the output pair of the changes in heart rate of human body to be measured first
The heart rate waveform answered；Then Fourier transformation is carried out to the heart rate waveform, to obtain and the heart rate waveform
Corresponding heart rate frequency spectrum；Three tops are finally positioned in the heart rate frequency range of the heart rate frequency spectrum, and by institute
State the frequency corresponding to three tops to be compared with a preceding heart rate, by frequency closest to a preceding heart rate
Heart rate peak be used as the people to be measured as Current heart rate peak, and using the frequency corresponding to the Current heart rate peak
The Current heart rate output of body, continuous motion artifacts can not be eliminated so as to overcome present in prior art
The problem of, it can also calculate accurate heart rate under the interference of prolonged persistent movement.
Brief description of the drawings
Fig. 1 is a kind of the specific of heart rate detection method based on PPG signals that first embodiment of the invention is provided
Implementation process figure；
Fig. 2 is a kind of the specific of heart rate detection method based on PPG signals that second embodiment of the invention is provided
Implementation process figure；
Fig. 3 is a kind of structure for heart rate detection system based on PPG signals that third embodiment of the invention is provided
Schematic diagram.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with accompanying drawing and reality
Example is applied, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
Only to explain the present invention, it is not intended to limit the present invention.
Fig. 1 is a kind of the specific of heart rate detection method based on PPG signals that first embodiment of the invention is provided
Implementation process figure.It is shown in Figure 1, a kind of heart based on PPG signals that first embodiment of the invention is provided
Rate detection method, including：
In S101`, corresponding heart rate ripple is exported according to the changes in heart rate of human body to be measured using PPG sensors
Shape.
In the present embodiment, the PPG sensors can be embedded in wearable device, for example：Finger ring, wrist
In band or intelligent watch, corresponding heart rate waveform is exported according to the change of the blood volume at human body wrist to be measured.
Further, the PPG sensors can be reflective PPG sensors or transmission-type PPG sensors.
In S102, Fourier transformation is carried out to the heart rate waveform, it is corresponding with the heart rate waveform to obtain
Heart rate frequency spectrum.
Fig. 2 shows one section 30 seconds long not comprising motion artifacts heart rate frequency spectrum；Fig. 3 shows one section 30 seconds
It is long not include motion artifacts heart rate frequency spectrum.Referring to shown in Fig. 2 and Fig. 3, although on frequency domain heart rate also by
Motion artifacts, but heart rate still maintains a more clearly crest, we still have an opportunity to pass through
Position heart rate peak and obtain accurate heart rate.So, in the present embodiment, when we sense by PPG
Device collects it after the heart rate waveform of human body to be measured and to be converted to frequency-region signal by Fourier transformation, with after an action of the bowels
It is continuous to obtain accurate heart rate by positioning heart rate peak on frequency domain.
In S103, three tops are positioned in the heart rate frequency range of the heart rate frequency spectrum, and by described three
Frequency corresponding to top is compared with a preceding heart rate, by frequency closest to a preceding heart rate heart rate
Peak is used as Current heart rate peak.
In the present embodiment, the heart rate frequency range is 0.83~3.67HZ, so including fortune when we obtain
After the heart rate frequency spectrum of dynamic interference, three tops in 0.83~3.67HZ frequency ranges, Ran Houfen are positioned at first
Before the frequency corresponding to three tops is not exported with the heart rate detection system based on PPG signals once
Heart rate is compared, because the interval of rate calculation is 1 second, so the adjacent heart rate exported twice does not have
Larger change, so we regard frequency as Current heart rate peak closest to the heart rate peak of a preceding heart rate.Need
It is noted that in the present embodiment, the heart rate that heart rate detection system is exported first is kept in human body to be measured
The heart rate waveform exported in the case of static according to PPG sensors directly calculates what is obtained, the heart rate prison inspection
It is built-in with examining system for detecting the motion sensor whether human body to be measured remains static.
In S104, using the frequency corresponding to the Current heart rate peak as the human body to be measured Current heart rate
Output.
In embodiments of the present invention, after Current heart rate peak is obtained, we can be according to the Current heart rate peak
Corresponding frequency is obtained in the heart rate frequency spectrum, and to being treated after frequency progress unit conversion
Survey after the Current heart rate value of human body and export.
Above as can be seen that a kind of heart rate detection method based on PPG signals provided in an embodiment of the present invention,
Due to exporting corresponding heart rate waveform according to the changes in heart rate of human body to be measured using PPG sensors first；Then
Fourier transformation is carried out to the heart rate waveform, to obtain heart rate frequency spectrum corresponding with the heart rate waveform；Most
Three tops are positioned in the heart rate frequency range of the heart rate frequency spectrum afterwards, and by corresponding to three tops
Frequency be compared with a preceding heart rate, using frequency closest to the heart rate peak of a preceding heart rate as working as front center
Rate peak, and exported the frequency corresponding to the Current heart rate peak as the Current heart rate of the human body to be measured,
So as to overcome the problem of can not eliminating continuous motion artifacts present in prior art, when long
Between persistent movement interference under can also calculate accurate heart rate.
Fig. 2 is a kind of the specific of rhythm of the heart method based on PPG signals that second embodiment of the invention is provided
Implementation process figure.Shown in Figure 2, relative to embodiment illustrated in fig. 1, the present embodiment is in heart rate frequency
Three tops of positioning in the heart rate frequency range of spectrum, and by the frequency corresponding to three tops with it is preceding once
Heart rate is compared, using frequency closest to the heart rate peak of a preceding heart rate as Current heart rate peak after also include：
In S204, the frequency corresponding to the Current heart rate peak and the difference of a preceding heart rate are calculated；
In S205, judge whether the difference is more than preset value, if the difference is more than the preset value,
Then enter step S206-1；If the difference is less than or equal to the preset value, into step S206-2；
In S206-1, give up the frequency corresponding to the Current heart rate peak, and a preceding heart rate is made
Exported for Current heart rate；
In S206-2, the frequency corresponding to the Current heart rate peak is worked as into front center as the human body to be measured
Rate is exported.
When in embodiments of the present invention, due to positioning three tops in heart rate frequency range, there is the heart of small probability
Rate peak is not among these three heart rate peaks, if so once exported before the frequency and system at Current heart rate peak
Frequency difference be more than preset value, then give up the frequency corresponding to Current heart rate peak, will a preceding heart rate as ought
Preceding heart rate output, can so prevent heart rate innumerable, the accuracy of the further heart rate for ensureing system output.
It is preferred that, in the present embodiment, the preset value is 30bpm.
Further, in the present embodiment, defeated according to the changes in heart rate of human body to be measured using PPG sensors
Going out after corresponding heart rate waveform to include：
Monitor whether the human body to be measured remains static using motion sensor, if at the human body to be measured
In inactive state, then the heart rate waveform directly exported according to the PPG sensors calculates the human body to be measured
Heart rate, and the heart rate is independently exported as Current heart rate.
In the present embodiment, a heart rate is made can be quoted in the detection process of heart rate due to system every time before
For the reference value of Current heart rate, with error accumulation it is possible that heart rate peak not in three tops simultaneously
And the frequency at three tops and the difference of a preceding heart rate are respectively less than preset value, can so cause heart rate to export
Deviate actual value by a small margin, and follow-up calculating skew gradually adds up so that there is larger error, so,
Whether I the addition during heart rate is detected are in static shape using motion sensor senses human body to be measured
State, when detecting human body to be measured and remaining static, then the heart rate ripple directly exported according to PPG sensors
Shape calculates the heart rate for obtaining human body to be measured, and the heart rate is independently exported as Current heart rate, can so enter
One step ensures the accuracy of heart rate, reduces the error for measuring heart rate.
It should be noted that the step in the present embodiment in step S201~S203 and embodiment illustrated in fig. 1
S101~S103 is identical, therefore is not repeated herein.
Above as can be seen that relative to a upper embodiment, it is a kind of based on PPG signals that the present embodiment is provided
Heart rate detection method can not only eliminate prolonged continuous motion artifacts, but also can further ensure
The accuracy of heart rate is exported, the error for measuring heart rate is reduced.
Fig. 3 is a kind of structure for heart rate detection system based on PPG signals that third embodiment of the invention is provided
Schematic diagram, the system is used for the method that 1~embodiment illustrated in fig. 2 of service chart is provided, when implementing, should
System can be located in the wearable devices such as wrist strap, wrist-watch and finger ring.Illustrate only for convenience of description with
The related part of the present embodiment.
It is shown in Figure 3, a kind of heart rate detection system based on PPG signals that the present embodiment is provided, including：
PPG sensors 1, for exporting corresponding heart rate waveform according to the changes in heart rate of human body to be measured；
FFT module 2, for carrying out Fourier transformation to the heart rate waveform, to obtain and the heart
The corresponding heart rate frequency spectrum of rate waveform；
Heart rate peak locating module 3, for positioning three tops in the heart rate frequency range of the heart rate frequency spectrum,
And be compared the frequency corresponding to three tops with a preceding heart rate, by frequency closest to previous
The heart rate peak of secondary heart rate is used as Current heart rate peak；
Heart rate output module 4, for regarding the frequency corresponding to the Current heart rate peak as the human body to be measured
Current heart rate output.
Optionally, the heart rate detection system based on PPG signals also includes error calculating module 5, uses
In：
Calculate the frequency corresponding to the Current heart rate peak and the difference of a preceding heart rate；
Judge whether the difference is more than preset value；
If the difference is more than the preset value, controls the heart rate output module 4 to give up and described work as front center
Frequency corresponding to rate peak, and a preceding heart rate is exported as Current heart rate；
If the difference is less than or equal to the preset value, control the heart rate output module 4 described will work as
Frequency corresponding to preceding heart rate peak is exported as the Current heart rate of the human body to be measured.
Optionally, the preset value is 30bpm.
Optionally, the heart rate detection system based on PPG signals also includes：
Motion sensor 6, for monitoring whether the human body to be measured remains static, if the people to be measured
Body remains static, then the heart for controlling the heart rate output module 4 to be exported according to the PPG sensors 1
The heart rate of human body to be measured described in rate waveshape, and the heart rate is independently exported as Current heart rate.
Optionally, the PPG sensors 1 are reflective or transmission-type PPG sensors.
It should be noted that modules in said system provided in an embodiment of the present invention, due to the present invention
Embodiment of the method is based on same design, and its technique effect brought is identical with the inventive method embodiment, specifically
Content can be found in the narration in the inventive method embodiment, and here is omitted.
Therefore, it can be seen that a kind of heart rate detection system based on PPG signals provided in an embodiment of the present invention,
Also due to exporting corresponding heart rate waveform according to the changes in heart rate of human body to be measured using PPG sensors first；
Then Fourier transformation is carried out to the heart rate waveform, to obtain heart rate frequency spectrum corresponding with the heart rate waveform；
Three tops are finally positioned in the heart rate frequency range of the heart rate frequency spectrum, and three tops institute is right
The frequency answered is compared with a preceding heart rate, using frequency closest to the heart rate peak of a preceding heart rate as current
Heart rate peak, and exported the frequency corresponding to the Current heart rate peak as the Current heart rate of the human body to be measured,
So as to overcome the problem of can not eliminating continuous motion artifacts present in prior art, when long
Between persistent movement interference under can also calculate accurate heart rate.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in this hair
Any modifications, equivalent substitutions and improvements made within bright spirit and principle etc., should be included in the present invention
Protection domain within.
Claims (10)
1. a kind of heart rate detection method based on PPG signals, it is characterised in that including：
Corresponding heart rate waveform is exported according to the changes in heart rate of human body to be measured using PPG sensors；
Fourier transformation is carried out to the heart rate waveform, to obtain heart rate frequency spectrum corresponding with the heart rate waveform；
Three tops are positioned in the heart rate frequency range of the heart rate frequency spectrum, and three tops institute is right
The frequency answered is compared with a preceding heart rate, using frequency closest to the heart rate peak of a preceding heart rate as current
Heart rate peak；
Exported the frequency corresponding to the Current heart rate peak as the Current heart rate of the human body to be measured.
2. the heart rate detection method as claimed in claim 1 based on PPG signals, it is characterised in that described
Three tops are positioned in the heart rate frequency range of the heart rate frequency spectrum, and by corresponding to three tops
Frequency is compared with a preceding heart rate, regard frequency as Current heart rate closest to the heart rate peak of a preceding heart rate
Also include after peak：
Calculate the frequency corresponding to the Current heart rate peak and the difference of a preceding heart rate；
Judge whether the difference is more than preset value；
If the difference is more than the preset value, give up the frequency corresponding to the Current heart rate peak, and will
A preceding heart rate is exported as Current heart rate；
If the difference is less than or equal to the preset value, the frequency corresponding to the Current heart rate peak is made
Exported for the Current heart rate of the human body to be measured.
3. the heart rate detection method as claimed in claim 2 based on PPG signals, it is characterised in that described
Preset value is 30bpm.
4. the heart rate detection method as claimed in claim 1 based on PPG signals, it is characterised in that described
Using PPG sensors according to the changes in heart rate at human body appointed part to be measured export corresponding heart rate waveform it
Also include afterwards：
Monitor whether the human body to be measured remains static using motion sensor, if at the human body to be measured
In inactive state, then the heart rate waveform directly exported according to the PPG sensors calculates the human body to be measured
Heart rate, and the heart rate is independently exported as Current heart rate.
5. the heart rate detection method as claimed in claim 1 based on PPG signals, it is characterised in that described
PPG sensors are reflective or transmission-type PPG sensors.
6. a kind of heart rate detection system based on PPG signals, it is characterised in that including：
PPG sensors, for exporting corresponding heart rate waveform according to the changes in heart rate of human body to be measured；
FFT module, for carrying out Fourier transformation to the heart rate waveform, to obtain and the heart rate
The corresponding heart rate frequency spectrum of waveform；
Heart rate peak locating module, for positioning three tops in the heart rate frequency range of the heart rate frequency spectrum, and
Frequency corresponding to three tops is compared with a preceding heart rate, by frequency closest to it is preceding once
The heart rate peak of heart rate is used as Current heart rate peak；
Heart rate output module, for regarding the frequency corresponding to the Current heart rate peak as the human body to be measured
Current heart rate is exported.
7. the heart rate detection system as claimed in claim 6 based on PPG signals, it is characterised in that also wrap
Error calculating module is included, is used for：
Calculate the frequency corresponding to the Current heart rate peak and the difference of a preceding heart rate；
Judge whether the difference is more than preset value；
If the difference is more than the preset value, the heart rate output module is controlled to give up the Current heart rate
Frequency corresponding to peak, and a preceding heart rate is exported as Current heart rate；
If the difference is less than or equal to the preset value, control the heart rate output module will be described current
Frequency corresponding to heart rate peak is exported as the Current heart rate of the human body to be measured.
8. the heart rate detection system as claimed in claim 7 based on PPG signals, it is characterised in that described
Preset value is 30bpm.
9. the heart rate detection system as claimed in claim 6 based on PPG signals, it is characterised in that also wrap
Include：
Motion sensor, for monitoring whether the human body to be measured remains static, if the human body to be measured
Remain static, then the heart rate waveform for controlling the heart rate output module to be exported according to the PPG sensors
The heart rate of the human body to be measured is calculated, and the heart rate is independently exported as Current heart rate.
10. the heart rate detection system as claimed in claim 6 based on PPG signals, it is characterised in that institute
PPG sensors are stated for reflective or transmission-type PPG sensors.
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