CN104244127B - A kind of heart rate detection method applied to earphone and the earphone that heart rate can be detected - Google Patents
A kind of heart rate detection method applied to earphone and the earphone that heart rate can be detected Download PDFInfo
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- CN104244127B CN104244127B CN201410422936.3A CN201410422936A CN104244127B CN 104244127 B CN104244127 B CN 104244127B CN 201410422936 A CN201410422936 A CN 201410422936A CN 104244127 B CN104244127 B CN 104244127B
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Abstract
The invention discloses a kind of heart rate detection method applied to earphone and the earphone that can detect heart rate.This method includes：One cavity is set in earphone, microphone is arranged in the cavity；Acceleration transducer is also set up in earphone；The signal collected to acceleration transducer carries out adaptive-filtering processing, obtains the estimation signal of signal caused by the body kinematics due to wearer in the signal that microphone collects；The estimation signal is subtracted in the signal collected from microphone, obtains the related signal of heart rate；Heart rate detection is carried out according to the related signal of heart rate.Technical scheme, microphone is disposed using closed chamber, reduce the interference of outside noise, enhance the signal message that microphone collects, and the signal progress adaptive-filtering of acceleration transducer collection is obtained estimating signal, the estimation signal is subtracted from the signal of microphone collection, then carries out heart rate detection, so as to eliminate influence of the body kinematics of wearer to heart rate detection.
Description
Technical field
The present invention relates to earphone and heart rate detection technical field, more particularly to a kind of heart rate detection method applied to earphone
With the earphone that can detect heart rate.
Background technology
With the continuous social and economic development, the living standard of people increasingly improves, and people also increasingly pay close attention to certainly
Oneself health.And heart rate detection will be provided on healthy very important information to people.It is any different from normal cardiac rate
Display all shows that health there is a problem, can find whether our body there is a problem in time by heart rate detection.The heart
Rate detection can also reflect whether the exercise intensity of people is suitable to a certain extent, in order to obtain optimal exercise effect
Heart rate should be maintained at during the exercise in certain scope by fruit, people, and heart rate detection can be rational motion
Amount provides an index.
In addition, many people like listening music with earphone, in order to measure in motion process during motion
Heart rate, other equipment need not be carried with again, how people detects the correlation technique of heart rate using earphone if beginning one's study.
The technology of heart rate is detected, in addition to heart rate band, a kind of present and emerging technology that heart rate is detected using earphone,
Reach convenient accurate purpose.
Just occurred in recent years to detect the technology of heart rate using earphone.23 to 25 October in 2013, Japan are horizontal
In the health apparatus exhibition of shore, Kaiteki companies and Bifrostec companies have put on display a kind of skill that pulse wave can be determined with earphone
Art.The technology is close to duct using earphone and forms closing space, and due to ear vibration of membrane, certain pressure can be produced in duct,
And pressure changes with the change of vibration, using the change information of pressure in microphone collection duct, so as to reach detection
The purpose of heart rate.But because earphone can not occupy whole duct, the leakage of gas in duct can be caused, causes microphone to detect
Detection less than the change of pressure, and heart rate can be disturbed by outside noise.
Using headset detection heart rate, in addition to it above mentioned problem be present, an also key factor, the standard to heart rate is affected
Really detection, the i.e. body kinematics of people.Because the body kinematics of people will necessarily cause the vibration of ear wall, this vibration can equally cause
The change of pressure in duct, this pressure change can be collected by microphone simultaneously, so as to disturb the analysis to heart rate signal.
The content of the invention
In view of this, the invention provides a kind of heart rate detection method applied to earphone and the earphone that heart rate can be detected,
To solve the above problems or solve the above problems at least in part.
The invention discloses a kind of heart rate detection method applied to earphone, this method includes：
One cavity is set in earphone, microphone is arranged in cavity；The position that the mouth of cavity is bonded with ear casing
It is the position for the ear casing being bonded when earphone is worn with the auricle of human ear；There is perforate at the ear casing that the mouth of cavity is bonded,
When earphone is worn, cavity and the auricle being bonded with perforate form confined space；
Acceleration transducer is also set up in earphone；
When earphone is worn, as the signal as caused by pressure change in microphone acquisition cavity body, by acceleration sensing
Device is gathered due to signal caused by the body kinematics of wearer；
The signal collected to acceleration transducer carries out adaptive-filtering processing, obtains in the signal that microphone collects
The body kinematics due to wearer caused by signal estimation signal；
Estimation signal is subtracted in the signal collected from microphone, obtains the related signal of heart rate；
Heart rate detection is carried out according to the related signal of heart rate.
Alternatively, estimation signal is subtracted in the signal collected from microphone, should before obtaining the related signal of heart rate
Method further comprises：The signal collected to microphone carries out low-pass filtering treatment, obtains low-pass filter signal；
Estimation signal is subtracted in the above-mentioned signal collected from microphone, the related signal of heart rate is obtained and specifically includes：From
Estimation signal is subtracted in low-pass filter signal, obtains the related signal of heart rate.
Alternatively, the above-mentioned signal collected to acceleration transducer carries out adaptive-filtering processing, obtains Mike's elegance
The estimation signal of signal caused by the body kinematics due to wearer in the signal collected includes：
Signal, heart rate coherent signal and the default adaptive algorithm collected according to acceleration transducer calculates adaptive
Answer filtering parameter；
The signal collected according to adaptive-filtering parameters on acceleration sensor carries out adaptive-filtering and obtains estimation letter
Number.
Alternatively, carrying out heart rate detection according to the related signal of heart rate includes：
The cycle of the signal related to heart rate is detected；
Heart rate is obtained by the inverse in the cycle of the signal detected.
Alternatively, the above-mentioned acceleration transducer that also set up in earphone includes：
The position for not contacting wearer's skin acceleration transducer being arranged in earphone.
The invention also discloses a kind of earphone that can detect heart rate, the earphone includes：Subtrator, heart rate detection unit,
Acceleration transducer, adaptive-filtering unit, the cavity being arranged in earphone and the microphone in cavity；
Wherein, the position that the mouth of cavity is bonded with ear casing is the earphone being bonded when earphone is worn with the auricle of human ear
The position of shell；There is perforate at the ear casing that the mouth of cavity is bonded, cavity and the auricle being bonded with perforate when earphone is worn
Form confined space；
Microphone, for when earphone is worn, the signal as caused by pressure change in acquisition cavity body is simultaneously exported to subtracting
Method unit；
Acceleration transducer, for when earphone is worn, gathering due to signal caused by the body kinematics of wearer
And export and give adaptive-filtering unit；
Adaptive-filtering unit, the signal for being collected according to heart rate coherent signal to acceleration transducer carry out adaptive
Filtering process is answered, obtains the estimation letter of signal caused by the body kinematics due to wearer in the signal that microphone collects
Exported after number to subtrator；
Subtrator, for subtracting estimation signal in the signal that is collected from microphone, it is defeated to obtain the related signal of heart rate
Go out to heart rate detection unit and adaptive-filtering unit；
Heart rate detection unit, for carrying out heart rate detection according to the related signal of heart rate.
Alternatively, the earphone further comprises：Low pass filter, the signal for being collected to microphone carry out low pass filtered
Ripple processing, obtains low-pass filter signal and exports to subtrator；
Subtrator, for subtracting estimation signal from low-pass filter signal, the related signal output of heart rate is obtained to the heart
Rate detection unit.
Alternatively, adaptive-filtering unit includes：Parameter adjustable wave filter and parameter adaptive adjustment unit；
Acceleration transducer, it is single for the signal output collected to be adjusted to Parameter adjustable wave filter and parameter adaptive
Member；
Subtrator, parameter adaptive adjustment unit is given for heart rate coherent signal to be exported；
Parameter adaptive adjustment unit, for collected according to acceleration transducer signal, heart rate coherent signal and
Default adaptive algorithm removes the filtering parameter of adjusting parameter tunable filter；
Parameter adjustable wave filter, for adaptively being filtered to the signal that acceleration transducer gathers using filtering parameter
Ripple, the estimation signal of signal caused by the body kinematics due to wearer in the signal that microphone collects is exported to subtraction
Unit.
Alternatively, heart rate detection unit, the cycle for the signal related to heart rate is detected, by the signal detected
The inverse in cycle obtain heart rate.
Alternatively, acceleration transducer is arranged on the position for not contacting wearer's skin in earphone.
From above-mentioned, this technical scheme in the embodiment of the present invention, employ by the cavity and ear casing in earphone
The airtight cavity of composition disposes microphone, reduces the interference of outside noise, and enhances the signal letter that microphone collects
Breath.In addition, this method also adds acceleration transducer to gather the signal as caused by the body kinematics of wearer in earphone,
Adaptive-filtering is carried out to the signal of acceleration transducer collection, after subtracting adaptive-filtering from the signal of microphone collection
Acceleration transducer signals, then heart rate detection is carried out, so as to eliminate influence of the body kinematics of wearer to heart rate detection, reach
To the purpose for obtaining accurate heart rate.
Brief description of the drawings
Fig. 1 is a kind of structural representation of earphone that can detect heart rate in the embodiment of the present invention；
Fig. 2A is the side schematic view of the earphone 100 for being provided with cavity 110 in one embodiment of the invention；
If 2B is the schematic rear view of earphone 100 for being provided with cavity 110 in one embodiment of the invention；
Fig. 2 C are the side sectional views of the earphone 100 for being provided with cavity 110 in one embodiment of the invention；
Fig. 3 is the schematic diagram of the riding position of the acceleration transducer in one embodiment of the invention；
Fig. 4 is a kind of structural representation of earphone that can detect heart rate in another embodiment of the invention；
Fig. 5 is the general structure schematic diagram of sef-adapting filter；
Fig. 6 is a kind of flow chart of heart rate detection method applied to earphone in the embodiment of the present invention.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
Fig. 1 is a kind of structural representation of earphone that can detect heart rate in the embodiment of the present invention.As shown in figure 1, the energy
The earphone 100 of detection heart rate includes：Subtrator 150, heart rate detection unit 160, acceleration transducer 130, adaptive-filtering
Unit 140, the cavity 110 being arranged in earphone and the microphone 120 in cavity 110；
Wherein, the position that the mouth of cavity 110 is bonded with ear casing is the ear being bonded when earphone is worn with the auricle of human ear
The position of casing；There is perforate at the ear casing that the mouth of cavity 110 is bonded, cavity and be bonded when earphone is worn with perforate
Auricle forms confined space.
Microphone 120, for when earphone 100 is worn, gathering the signal as caused by pressure change in cavity 110 simultaneously
Export to subtrator 150.
Acceleration transducer 130, for when earphone is worn, gathering due to letter caused by the body kinematics of wearer
Number and export to adaptive-filtering unit 140.
Adaptive-filtering unit 140, the signal for being collected according to heart rate coherent signal to acceleration transducer 130 enter
The processing of row adaptive-filtering, obtain letter caused by the body kinematics due to wearer in the signal that microphone 120 collects
Number estimation signal after export to subtrator 150.
Subtrator 150, for subtracting the estimation of the output of adaptive-filtering unit 140 in the signal that is collected from microphone
Signal, the related signal output of heart rate is obtained to heart rate detection unit 160 and adaptive-filtering unit 140.
Heart rate detection unit 160, for carrying out heart rate detection according to the related signal of heart rate.
The signal detected in Fig. 1 to acceleration transducer 130 carries out adaptive-filtering processing so that can be passed from acceleration
The human motion signal that sensor 130 collects estimates the human motion signal that microphone 120 collects exactly, the purpose is to
Eliminate influence of the body kinematics to heart rate detection due to people.Microphone 120 and acceleration transducer 130 can all detect due to
Vibration signal caused by the body kinematics of people, although two kinds of signal periods are consistent, amplitude can be variant, it is therefore desirable to uses
Wave filter eliminates this species diversity, enabling disappears in the signal for collecting acceleration signal caused by human motion from microphone
Remove, to obtain effective heart rate information.
In the earphone 100 that can detect heart rate shown in Fig. 1, cavity 110 is set to dispose microphone 120 in earphone 100,
So as to reduce the interference of outside noise, and enhance the signal message that microphone 120 collects.In addition, this can detect heart rate
Earphone 100 in add acceleration transducer 130 to gather the signal as caused by the body kinematics of wearer, to acceleration pass
The signal that sensor 130 gathers carries out adaptive-filtering, and the acceleration after adaptive-filtering is subtracted from the signal of microphone collection
Sensor signal, then heart rate detection is carried out, so as to eliminate influence of the body kinematics of wearer to heart rate detection.
In one embodiment of the invention, the earphone shown in Fig. 1 further comprises low pass filter, for microphone
The signal collected carries out low-pass filtering treatment, is exported again to subtrator 150 after obtaining low-pass filter signal.That is subtrator
150, for subtracting the estimation signal of the output of adaptive-filtering unit 140 from low-pass filter signal, obtain the related letter of heart rate
Number export and to give heart rate detection unit.Because the frequency of pulsatile motion is relatively low (0.3Hz-3Hz or so), and outside noise frequency
It is higher, according to this feature, the influence of outside high-frequency noise can be eliminated by low pass filter.For example, low pass filter can
To select cut-off frequency as 5Hz FIR filter etc..
In the technology of existing headset detection heart rate, usual microphone is directly placed at the position of face duct in earphone
Put, for gathering ear cavity pressure change information caused by eardrum, but on the one hand due to earphone and the space of duct formation
It is larger, the leakage of gas in duct can be caused so that the pressure changing information of microphone collection is very faint, and another aspect earphone is past
Toward whole duct can not be occupied, directly microphone is placed in earphone, can be disturbed by outside noise.Therefore the figure of the present invention
The mounting means of another microphone is devised in earphone shown in 1, specifically may refer to Fig. 2A -2C.
Fig. 2A is the side schematic view of the earphone 100 for being provided with cavity 110 in one embodiment of the invention.If 2B is this
The schematic rear view of earphone 100 for being provided with cavity 110 in invention one embodiment.Fig. 2 C are in one embodiment of the invention
It is provided with the side sectional view of the earphone 100 of cavity 110.In order to preferably gather the useful signal related to heartbeat, the present invention
A kind of small cavity is devised to be used to place microphone.Referring to Fig. 2A and Fig. 2 B, the scope in figure shown in dotted line is internal cavity 110
Position signal.It is bonded referring to the opening and ear casing of Fig. 2 C cavitys 110.As can be seen that in this embodiment, cavity 110
Press close to the position of auricle positioned at earphone edge, earphone has individual perforate 111 at the position that it is bonded with cavity, worn in earphone
When, this perforate 111 and auricle are brought into close contact, and so, cavity 110 and the auricle part being adjacent to form a closed space.
Microphone is arranged in the cavity 110, the contraction vibration of auricle wall can cause the change of pressure in cavity 110, then Mike
Wind will collect the change information of pressure in cavity 110, and the information reflects the jumping frequency rate of heart to a certain extent, because
This can carry out heart rate detection accordingly.
Fig. 3 is the schematic diagram of the riding position of the acceleration transducer in one embodiment of the invention.Due to the fortune of human body
The dynamic skin that can make human body vibrates therewith, and acceleration sensor apparatus does not contact the portion of skin in earphone in the present embodiment
Position, so as to which the signal for avoiding skin vibrations from gathering acceleration transducer impacts, improve acceleration transducer collection signal
The degree of accuracy.Referring to Fig. 3, acceleration transducer 130 can be placed on any one for the earphone that dotted line frame shown in Fig. 3 illustrates
Position.
In physics, for closed space (not considering temperature), pressure and volume are inversely proportional, that is to say, that volume is got over
Small pressure is bigger, then the pressure acted on certain area is also bigger.After user takes earphone, formation one is close in duct
The space closed, because the pulse pressure fluctuation of blood vessel causes ear wall to shrink, then certain pressure change can be produced in cavity, the pressure
Power variable signal will be detected by microphone.In general the pulse pressure fluctuation of blood vessel is very faint, and closed space is bigger, that
The pressure change that microphone detects is smaller, in order to increase the pressure change intensity that microphone detects, by microphone apparatus
In a closed small cavity, duct is close in the part, shrinks vibration because the pulse pressure fluctuation of blood vessel causes ear wall to produce,
This vibrates the change for causing the microphone in small cavity to detect pressure.And the design of small cavity can reduce to a certain extent
The influence of external interference signal.
Even if earphone can occupy whole duct, completely enclosed cavity is formed, the body kinematics of people is to heart rate detection
Influence and inevitable.Because the body kinematics of people inevitably results in the vibration of ear wall, and cavity caused by this vibration
Interior pressure change can equally be detected by microphone.So, the data that microphone collects not only include due to blood vessel
Pressure changing information caused by pulse pressure fluctuation, while include the body kinematics of the people caused pressure changing information in duct.
In order to eliminate influence of the body kinematics of people to heart rate detection, the present invention adds acceleration transducer in earphone, and acceleration passes
Sensor arrangement does not contact the position of skin in earphone, than the earphone position shown in dotted line frame as shown in Figure 3.Utilize acceleration
Spend acceleration information caused by the body kinematics of sensor collection people.Caused by the body kinematics of people in duct pressure change
Changing information and acceleration has identical vibration frequency, and certain wave filter can be used to eliminate the body fortune of people based on this
Disturbed caused by dynamic.
According to analysis above, if can be filtered out from the signal that microphone detects due to produced by the body kinematics of people
Signal, then can be obtained by because blood flow causes signal caused by duct autogenous shrinkage, this signal and heartbeat
Frequency is relevant, and heart rate information is obtained based on this signal.
Microphone is collected including the ear canal pressure change information caused by the body kinematics of people, acceleration transducer collection
To be acceleration information corresponding to the body kinematics of people.Although two kinds of signals have the same vibration frequency, i.e. periodicity phase
Together, but amplitude can be different, it is impossible to remove in the signal for directly collecting the signal from microphone, therefore the present embodiment passes through
The method of adaptive-filtering come filter out due to caused by the body kinematics of people interference.
In summary, in the embodiment of the present invention：First, microphone is disposed using the airtight cavity of small volume, reduced
Outside noise interference, and enhance the signal message that microphone detects.Secondly, acceleration sensing is added in earphone
Device, transported for gathering due to signal caused by the body kinematics of people, and by designing sef-adapting filter to eliminate the body of people
The dynamic influence to heart rate detection.Furthermore according to the characteristics of pulsatile motion frequency, low pass filter is devised, is further reduced
The influence of outside noise.It is further detailed below by taking Fig. 4 as an example.
Fig. 4 is a kind of structural representation of earphone that can detect heart rate in another embodiment of the invention.Such as Fig. 4 institutes
Show, the earphone 400 that can detect heart rate includes：Subtrator 450, heart rate detection unit 460, low pass filter 470, acceleration
Sensor 430, adaptive-filtering unit 440, the cavity 410 being arranged in earphone and the microphone in cavity 410
420.Wherein, adaptive-filtering unit 440 includes：Parameter adjustable wave filter 441 and parameter adaptive adjustment unit 442.
Wherein, the position that the mouth of cavity 410 is bonded with ear casing is the ear being bonded when earphone is worn with the auricle of human ear
The position of casing；There is perforate at the ear casing that the mouth of cavity 410 is bonded, cavity and be bonded when earphone is worn with perforate
Auricle forms confined space.
Microphone 420, for when earphone 400 is worn, gathering the signal as caused by pressure change in cavity 410
And export to low pass filter 470.
Low pass filter 470, the signal for being collected to microphone 420 carry out low-pass filtering treatment, obtain low pass filtered
Exported again to subtrator 450 after ripple signal.
Acceleration transducer 430, for when earphone is worn, gathering due to letter caused by the body kinematics of wearer
Number and export to the Parameter adjustable wave filter 441 and parameter adaptive adjustment unit 442 in adaptive-filtering unit 440.
Parameter adaptive adjustment unit 442, for the related letter of signal, heart rate collected according to acceleration transducer 430
Number and default adaptive algorithm remove the filtering parameter of adjusting parameter tunable filter 441.
Parameter adjustable wave filter 441, the signal for being gathered using filtering parameter to acceleration transducer 430 carry out adaptive
It should filter, the estimation letter of signal caused by the body kinematics due to wearer in the signal that output Mike elegance 420 collects
Number give subtrator 450.
Subtrator 450, for subtracting estimating for the output of Parameter adjustable wave filter 441 in the signal that is exported from low pass filter
Signal is counted, obtains the related signal output of heart rate to heart rate detection unit 460；Subtrator 450, it is additionally operable to the related letter of heart rate
Number export to parameter adaptive adjustment unit 442.
Here the signal and subtraction that parameter adaptive adjustment unit 442 gathers according to the acceleration transducer 430 of input
The heart rate coherent signal that unit 450 feeds back, the filtering parameter of Parameter adjustable wave filter 441 is calculated using adaptive algorithm.
Heart rate detection unit 460, for carrying out heart rate detection according to the related signal of heart rate.
In one embodiment of the invention, heart rate detection unit 460, the cycle for the signal related to heart rate are carried out
Detection, heart rate is obtained by the inverse in the cycle of the signal detected.For example, heart rate detection unit 460, can utilize it is existing from
Correlation technique, threshold method etc. detect the cycle of the related signal of heart rate.
Fig. 5 is the general structure schematic diagram of sef-adapting filter.As shown in figure 5, sef-adapting filter mainly can by parameter
Parameter adaptive adjustment unit two parts of tunable filter and adjustment filter coefficient are formed.Sef-adapting filter design when not
Need to know in advance the knowledge for the statistical property for having OFF signal, it being capable of gradual " understanding " or estimation in the course of work of oneself
Go out required statistical property, and the parameter of adjust automatically oneself on this basis, to reach optimum filtering effect.In Fig. 5, Ex
(n) it is desired signal, In (n) is input signal, and Out (n) is output signal, and e (n) is evaluated error, e (n)=Ex (n)-Out
(n).The filter factor of sef-adapting filter is controlled by error signal, and e (n) is entered by predetermined adaptive algorithm to adaptation coefficient
Row adjustment, finally make it that e (n) mean square error is minimum, now output signal most approaches desired signal.
In the earphone shown in Fig. 4, employ sef-adapting filter and the signal that acceleration transducer collects is filtered
Ripple processing, accurately to estimate that microphone collects due to signal caused by human motion.As shown in figure 4, y1 (n) is to accelerate
The signal that degree sensor 430 collects, that is, correspond to the input signal in adaptive-filtering unit 440, y2 (n) is adaptive-filtering
The output signal of unit 440, desired signal corresponding to xL (n) expressions,Corresponding error signal (mainly including heart rate signal).
XL (n) and y1 (n) have certain correlation, can be by designing suitable transmission function, to cause y1 (n) devices after filtering
Output signal y2 (n) afterwards approaches xL (n).Such as can be according to minimum mean square error criterion, when the square expectation of error signal
When being worth minimum, output signal y2 (n) and desired signal xL (n) are closest, then can examines human motion to heart rate afterwards
Removed in the signal that the interference of survey collects from microphone, remove the influence of interference signal again.Microphone passes through LPF
Signal afterwards subtracts signal of the acceleration transducer after adaptive-filtering, obtains the signal message related to heart rate
The detection of heart rate is carried out based on this.The bounce of heart has certain periodicity, thenIt is with some cycles
Signal, in the cycle according to corresponding to autocorrelation method can obtain the signal, the inverse in cycle is heart rate.
Detailed process is as follows：
It is assumed that the signal that microphone detects is：X (n)=y (n)+d (n), the signal that acceleration transducer detects are y1
(n)。
Wherein, y (n) is represented because pressure change signal caused by the body kinematics of people, d (n) are represented due to blood stream
Pressure change signal caused by dynamic；Y1 (n) is represented because acceleration signal caused by the body kinematics of people, n represent sampling
Time point.
X (n) signals after LPF are changed into：XL (n)=yL (n)+dL (n).
Y1 (n) and y (n) is signal caused by same motion, is acceleration information corresponding to y1 (n), and y (n) is corresponding
Be pressure information, although amplitudes corresponding to both are different, there is identical vibration frequency.In order to which y (n) is disappeared from x (n)
Remove, select sef-adapting filter (shock response is h (n)) to be filtered y1 (n), obtain y2 (n)=y1 (n) * h (n), make y2
(n) the signal xL (n) close to x (n) after LPF.
So the signal caused by duct shrinks can be expressed as：
The auto-adaptive parameter of wave filter is obtained using adaptive algorithm, and the method for realizing adaptive algorithm is a lot, such as
The minimum method of mean square error can be used, that is, is causedTake the filter coefficient obtained during minimum value.
Try to achieveAfterwards, can be using autocorrelation method, threshold method etc. come to its week according to the periodic characteristics of the signal
Phase is detected, and the inverse in its cycle is exactly heart rate.
People can be obtained in various situations (quiet, motion etc.) by the earphone in Fig. 1 or embodiment illustrated in fig. 4
Heart rate, to obtain the health information of people, or people can be as the case may be by the motion of oneself on this basis
Amount control is in a suitable scope.
The heart rate detection method applied to earphone in the present invention, the inventive method embodiment are provided based on above-described embodiment
In the particular content of each step may refer to the associated descriptions of product embodiments of the present invention.
Fig. 6 is a kind of flow chart of heart rate detection method applied to earphone in the embodiment of the present invention.As shown in fig. 6, should
Method includes：
Step S601, a cavity is set in earphone, microphone is arranged in cavity；The mouth of cavity pastes with ear casing
The position of conjunction is the position for the ear casing being bonded when earphone is worn with the auricle of human ear；The ear casing that the mouth of cavity is bonded
There is perforate at place, and when earphone is worn, cavity and the auricle being bonded with perforate form confined space；Acceleration is also set up in earphone
Spend sensor.For example, acceleration transducer is arranged on to the position for not contacting wearer's skin in earphone.
Step S602, when earphone is worn, as the signal as caused by pressure change in microphone acquisition cavity body, by adding
Velocity sensor is gathered due to signal caused by the body kinematics of wearer；
Step S603, the signal collected to acceleration transducer carry out adaptive-filtering processing, obtain microphone collection
To signal in the body kinematics due to wearer caused by signal estimation signal.
Step S604, the estimation signal is subtracted in the signal collected from microphone, obtain the related signal of heart rate；
Step S605, heart rate detection is carried out according to the related signal of heart rate.
In one embodiment of the invention, the method shown in Fig. 6 subtracts estimation in the signal collected from microphone
Signal, obtain further comprising before the related signal of heart rate：The signal collected to microphone carries out low-pass filtering treatment, obtains
To low-pass filter signal.The estimation signal then is subtracted in the signal collected from microphone in step S604, obtains heart rate phase
The signal of pass specifically includes：The estimation signal is subtracted from low-pass filter signal, obtains the related signal of heart rate.
In one embodiment of the invention, the signal collected in step S603 to acceleration transducer carries out adaptive
Filtering process, obtain the estimation signal of signal caused by the body kinematics due to wearer in the signal that microphone collects
Including：
Signal, heart rate coherent signal and the default adaptive algorithm collected according to acceleration transducer calculates adaptive
Answer filtering parameter；
The signal collected according to adaptive-filtering parameters on acceleration sensor carries out adaptive-filtering and obtains the estimation
Signal.
In one embodiment of the invention, carrying out heart rate detection according to the related signal of heart rate in step S605 includes：
The cycle of the signal related to heart rate is detected, and heart rate is obtained by the inverse in the cycle of the signal detected.
The beneficial effect of technical solution of the present invention includes in summary：
(1) airtight cavity of small volume is employed to dispose microphone, reduces outside noise interference, and enhance wheat
The signal message that gram wind detects.
(2) acceleration transducer is added in earphone, for gathering due to signal caused by the body kinematics of people, and is led to
Design sef-adapting filter is crossed to eliminate influence of the body kinematics of people to heart rate detection.
(3) according to the characteristics of pulsatile motion frequency, a kind of low pass filter is devised, extraneous high frequency is further reduced and makes an uproar
The influence of sound.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent substitution and improvements made within the spirit and principles in the present invention etc., are all contained in protection scope of the present invention
It is interior.
Claims (10)
1. a kind of heart rate detection method applied to earphone, it is characterised in that methods described includes：
One cavity is set in earphone, microphone is arranged in the cavity；What the mouth of the cavity was bonded with ear casing
Position is the position for the ear casing being bonded when earphone is worn with the auricle of human ear；The ear casing that the mouth of the cavity is bonded
There is perforate at place, and when earphone is worn, the cavity and the auricle being bonded with the perforate form confined space；
Acceleration transducer is also set up in earphone；
When earphone is worn, the signal as caused by pressure change in the cavity is gathered as the microphone, added by described
Velocity sensor is gathered due to signal caused by the body kinematics of wearer；
The signal collected to the acceleration transducer carries out adaptive-filtering processing, obtains in the signal that microphone collects
The body kinematics due to wearer caused by signal estimation signal；
The estimation signal is subtracted in the signal collected from microphone, obtains the related signal of heart rate；
Heart rate detection is carried out according to the related signal of the heart rate.
2. the method as described in claim 1, it is characterised in that
The estimation signal is subtracted in the signal collected from microphone, before obtaining the related signal of heart rate, this method is entered
One step includes：The signal collected to the microphone carries out low-pass filtering treatment, obtains low-pass filter signal；
The estimation signal is subtracted in the signal collected from microphone, the related signal of heart rate is obtained and specifically includes：From
The estimation signal is subtracted in the low-pass filter signal, obtains the related signal of heart rate.
3. method as claimed in claim 1 or 2, it is characterised in that the signal collected to the acceleration transducer
Adaptive-filtering processing is carried out, obtains signal caused by the body kinematics due to wearer in the signal that microphone collects
Estimation signal include：
Signal, heart rate coherent signal and the default adaptive algorithm collected according to acceleration transducer calculates adaptive filter
Wave parameter；
Estimate according to obtaining the signal progress adaptive-filtering that the adaptive-filtering parameters on acceleration sensor collects
Count signal.
4. method as claimed in claim 1 or 2, it is characterised in that the signal related according to the heart rate carries out heart rate
Detection includes：
The cycle of the signal related to the heart rate is detected；
Heart rate is obtained by the inverse in the cycle of the signal detected.
5. the method as described in claim 1, it is characterised in that the acceleration transducer that also set up in earphone includes：
The position for not contacting wearer's skin acceleration transducer being arranged in earphone.
6. a kind of earphone that can detect heart rate, it is characterised in that the earphone includes：Subtrator, heart rate detection unit, acceleration
Sensor, adaptive-filtering unit, the cavity being arranged in earphone and the microphone in the cavity；
Wherein, the position that the mouth of the cavity is bonded with ear casing is the earphone being bonded when earphone is worn with the auricle of human ear
The position of shell；There is perforate at the ear casing that the mouth of the cavity is bonded, the cavity and opened when earphone is worn with described
The auricle of hole fitting forms confined space；
The microphone, for when earphone is worn, gathering the signal as caused by pressure change in the cavity and exporting
To subtrator；
The acceleration transducer, for when earphone is worn, gathering due to signal caused by the body kinematics of wearer
And export to the adaptive-filtering unit；
The adaptive-filtering unit, the signal for being collected according to heart rate coherent signal to the acceleration transducer are carried out
Adaptive-filtering processing, obtains estimating for signal caused by the body kinematics due to wearer in the signal that microphone collects
Exported after meter signal to the subtrator；
The subtrator, for subtracting the estimation signal in the signal that is collected from microphone, obtain the related letter of heart rate
Number export to the heart rate detection unit and the adaptive-filtering unit；
The heart rate detection unit, for carrying out heart rate detection according to the related signal of the heart rate.
7. earphone as claimed in claim 6, it is characterised in that the earphone further comprises：Low pass filter, for described
The signal that microphone collects carries out low-pass filtering treatment, obtains low-pass filter signal and exports to the subtrator；
The subtrator, for subtracting the estimation signal from the low-pass filter signal, obtain the related signal of heart rate
Export to the heart rate detection unit.
8. earphone as claimed in claims 6 or 7, it is characterised in that the adaptive-filtering unit includes：Parameter adjustable filters
Device and parameter adaptive adjustment unit；
The acceleration transducer, for the signal output collected is adaptive to the Parameter adjustable wave filter and the parameter
Answer adjustment unit；
The subtrator, for the heart rate coherent signal to be exported to the parameter adaptive adjustment unit；
The parameter adaptive adjustment unit, for collected according to acceleration transducer signal, heart rate coherent signal and
Default adaptive algorithm goes to adjust the filtering parameter of the Parameter adjustable wave filter；
The Parameter adjustable wave filter, for adaptively being filtered to the signal that acceleration transducer gathers using filtering parameter
Ripple, the estimation signal of signal caused by the body kinematics due to wearer in the signal that microphone collects is exported to described
Subtrator.
9. earphone as claimed in claims 6 or 7, it is characterised in that
The heart rate detection unit, the cycle for the signal related to the heart rate are detected, by the signal that detects
The inverse in cycle obtains heart rate.
10. earphone as claimed in claim 6, it is characterised in that
The acceleration transducer is arranged on the position for not contacting wearer's skin in earphone.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410422936.3A CN104244127B (en) | 2014-08-25 | 2014-08-25 | A kind of heart rate detection method applied to earphone and the earphone that heart rate can be detected |
| US14/901,581 US9579029B2 (en) | 2014-07-24 | 2015-05-25 | Heart rate detection method used in earphone and earphone capable of detecting heart rate |
| DK15810778.9T DK3009070T3 (en) | 2014-07-24 | 2015-05-25 | METHOD OF DETECTING HEART RATE IN HEADPHONE AND HEADPHONE THAT CAN DETECT HEART RATE |
| KR1020157036700A KR101660671B1 (en) | 2014-07-24 | 2015-05-25 | Heart rate detection method used in earphone and earphone capable of detecting heart rate |
| PCT/CN2015/079680 WO2016011843A1 (en) | 2014-07-24 | 2015-05-25 | Heartrate detection method applicable in headphone and headphone capable of detecting heartrate |
| EP15810778.9A EP3009070B1 (en) | 2014-07-24 | 2015-05-25 | Heartrate detection method applicable in headphone and headphone capable of detecting heartrate |
| JP2015563115A JP6174169B2 (en) | 2014-07-24 | 2015-05-25 | Heart rate detection method applied to earphone and earphone capable of detecting heart rate |
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| CN201410422936.3A CN104244127B (en) | 2014-08-25 | 2014-08-25 | A kind of heart rate detection method applied to earphone and the earphone that heart rate can be detected |
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| CN104244127B true CN104244127B (en) | 2017-12-19 |
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| JP6174169B2 (en) * | 2014-07-24 | 2017-08-02 | ゴーアテック インコーポレイテッドＧｏｅｒｔｅｋ Ｉｎｃ | Heart rate detection method applied to earphone and earphone capable of detecting heart rate |
| US9635458B2 (en) * | 2014-07-24 | 2017-04-25 | Goertek, Inc. | Heart rate detection method used in earphone and earphone capable of detecting heart rate |
| CN105232021A (en) * | 2015-08-25 | 2016-01-13 | 惠州Tcl移动通信有限公司 | Method for reminding exercise overload and earphone |
| CN106551682B (en) * | 2015-09-24 | 2020-03-27 | 华为终端有限公司 | Earphone for measuring human body vital signs |
| CN105982659A (en) * | 2016-03-17 | 2016-10-05 | 厦门鑫奥力电器有限公司 | Ear clip for measuring heart rate and control method thereof |
| CN105943013B (en) * | 2016-05-09 | 2020-03-06 | 安徽华米信息科技有限公司 | Heart rate detection method and device and intelligent wearable device |
| CN106851459A (en) * | 2017-03-22 | 2017-06-13 | 广州三星通信技术研究有限公司 | In-Ear Headphones |
| CN108429972B (en) * | 2018-05-28 | 2019-12-27 | Oppo广东移动通信有限公司 | Music playing method, device, terminal, earphone and readable storage medium |
| JP7317448B2 (en) * | 2018-12-18 | 2023-07-31 | 三星電子株式会社 | Biological information detector |
| US10917716B2 (en) * | 2019-06-19 | 2021-02-09 | Cirrus Logic, Inc. | Apparatus for and method of wind detection |
| CN111586522B (en) * | 2020-05-20 | 2022-04-15 | 歌尔科技有限公司 | Earphone noise reduction method, earphone noise reduction device, earphone and storage medium |
| DE102022206012B3 (en) * | 2022-06-14 | 2023-08-31 | Sivantos Pte. Ltd. | Method for measuring a person's heart rate using a hearing system |
| CN115177132A (en) * | 2022-07-08 | 2022-10-14 | 绍兴市盘领工艺品有限公司 | Graphene heating blanket |
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| EP1749477A1 (en) * | 2004-05-24 | 2007-02-07 | Pioneer Corporation | Bioinformation sensor |
| US8622919B2 (en) * | 2008-11-17 | 2014-01-07 | Sony Corporation | Apparatus, method, and computer program for detecting a physiological measurement from a physiological sound signal |
| CN102006528B (en) * | 2009-08-31 | 2014-01-08 | 幻音科技(深圳)有限公司 | Earphone device |
| CN102158780A (en) * | 2011-05-18 | 2011-08-17 | 瑞声声学科技(深圳)有限公司 | Earphone wire control component |
| BR112014005666A2 (en) * | 2011-09-16 | 2017-03-28 | Koninklijke Philips Nv | portable device, method and system for determining a person's heart rate; and computer program product |
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