CN104244125B - 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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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, the first microphone is arranged in the cavity；The position for not contacting skin in earphone also sets up second microphone；The signal collected to second microphone carries out adaptive-filtering processing, obtains the estimation signal of the external interference signal in the signal that the first microphone collects；The estimation signal is subtracted in the signal collected from the first microphone, obtains the related signal of heart rate；Heart rate detection is carried out according to the related signal of heart rate.Technical scheme, first microphone is disposed using closed chamber, reduce the interference of outside noise, and the signal progress adaptive-filtering of second microphone collection is obtained estimating signal, the estimation signal is subtracted from the signal of the first microphone collection, heart rate detection is carried out again, so as to further obviate influence of the external interference signal 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.
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
Less than the change of pressure.
In addition, using headset detection heart rate also exist one it is important the problem of, be just susceptible to external interference signal
Influence, this can largely effect on the detection of heart rate.
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, the first microphone is arranged in the cavity；The mouth and earphone of the cavity
The position of shell fitting is the position for the ear casing being bonded when earphone is worn with the auricle of human ear；The mouth of the cavity is bonded
Ear casing at have perforate, when earphone is worn, the cavity and the auricle that is bonded with the perforate form confined space；
The opening position for not contacting wearer's skin in earphone also sets up second microphone；
When earphone is worn, the signal as caused by pressure change in the cavity is gathered as first microphone,
External interference signal is gathered by the second microphone；
The signal collected to the second microphone carries out adaptive-filtering processing, obtains what the first microphone collected
The estimation signal of external interference signal in signal；
The estimation signal is subtracted in the signal collected from the first microphone, obtains the related signal of heart rate；
Heart rate detection is carried out according to the related signal of the heart rate.
Alternatively, the estimation signal is subtracted in the signal collected from the first microphone, obtains the related letter of heart rate
Before number, this method further comprises：The signal collected to first microphone carries out low-pass filtering treatment, obtains low pass
Filtering signal；
The estimation signal is subtracted in the signal collected from the first microphone, it is specific to obtain the related signal of heart rate
Including：The estimation signal is subtracted from the low-pass filter signal, obtains the related signal of heart rate.
Alternatively, the signal collected to the second microphone carries out adaptive-filtering processing, obtains the first wheat
The estimation signal of external interference signal in the signal that gram wind collects includes：
Signal, the related signal of heart rate and the default adaptive algorithm collected according to second microphone calculates adaptive
Answer filtering parameter；
According to obtaining the signal progress adaptive-filtering that the adaptive-filtering parameter collects to second microphone
Estimate signal.
Alternatively, the signal related according to the heart rate, which 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.
Alternatively, the opening position for not contacting wearer's skin in earphone, which also sets up second microphone, includes：
Second microphone is arranged in the engaging lug chain-drive section of earphone and the earphone handle of earphone cord.
The invention also discloses a kind of earphone that can detect heart rate, the earphone includes：Subtrator, heart rate detection unit,
Adaptive-filtering unit, the cavity being arranged in earphone, the first microphone in the cavity, and it is arranged on earphone
In the opening position for not contacting wearer's skin second microphone；
Wherein, the position that the mouth of the cavity is bonded with ear casing is to be bonded when earphone is worn with the auricle of human ear
The position of ear casing；Have perforate at the ear casing that the mouth of the cavity is bonded, when earphone is worn the cavity and with institute
The auricle for stating perforate fitting forms confined space；
First microphone, for when earphone is worn, gathering the letter as caused by pressure change in the cavity
Number and export to subtrator；
The second microphone, for when earphone is worn, gathering external interference signal and exporting to described adaptive
Filter unit；
The adaptive-filtering unit, for the signal collected according to the related signal of heart rate to the second microphone
Adaptive-filtering processing is carried out, is exported after obtaining the estimation signal of the external interference signal in the signal that the first microphone collects
To the subtrator；
The subtrator, for subtracting the estimation signal in the signal that is collected from the first microphone, obtain heart rate
Related signal output gives 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.
Alternatively, the earphone further comprises：Low pass filter, the signal for being collected to first microphone enter
Row low-pass filtering treatment, obtain low-pass filter signal and export to the subtrator；
The subtrator, for subtracting the estimation signal from the low-pass filter signal, obtain heart rate correlation
Signal output gives the heart rate detection unit.
Alternatively, the adaptive-filtering unit includes：Parameter adjustable wave filter and parameter adaptive adjustment unit；
The second microphone, for giving the signal output collected to the Parameter adjustable wave filter and the parameter certainly
Adapt to adjustment unit；
The subtrator, for giving the related signal output of the heart rate to the parameter adaptive adjustment unit；
The parameter adaptive adjustment unit, for signal, the signal of heart rate correlation collected according to second microphone
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 second microphone gathers using filtering parameter
Ripple, the estimation signal of external interference signal in the signal that the first microphone collects is exported to the subtrator.
Alternatively, the heart rate detection unit, the cycle for the signal related to the heart rate is detected, by detecting
The inverse in the cycle of the signal gone out obtains heart rate.
Alternatively, the second microphone is arranged in the engaging lug chain-drive section of earphone and the earphone handle of earphone cord.
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 the first microphone, reduces the interference of outside noise, and enhance the first microphone and collect
Signal message.But external interference signal still has, on the other hand, adding second microphone in earphone to gather external interference
Signal, the external interference letter in the first microphone collection signal is obtained to the signal progress adaptive-filtering of second microphone collection
Number estimation signal, subtract the estimation signal from the signal of the first microphone collection, then carry out heart rate detection, so as to further
Influence of the external interference signal to heart rate detection is eliminated, reaches 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 second microphone 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, adaptive-filtering unit 140, it is arranged on ear
Cavity 110 in machine and the first microphone 120 in cavity 110, and be arranged in earphone and do not contact wearer
The second microphone 130 of the opening position of skin；
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.
First microphone 120, for when earphone 100 is worn, gathering the letter as caused by pressure change in cavity 110
Number and export to subtrator 150.
Second microphone 130, adaptive-filtering list is given for when earphone is worn, gathering external interference signal and exporting
Member 140.
Adaptive-filtering unit 140, the signal for being collected according to the related signal of heart rate to second microphone 130 enter
The processing of row adaptive-filtering, obtain defeated after the estimation signal of external interference signal in the signal that the first microphone 120 collects
Go out 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.
First microphone 120 can collect the external world while signal as caused by pressure change in cavity 110 is gathered
Interference signal.Therefore, the signal that is detected in Fig. 1 to second microphone 130 carries out adaptive-filtering processing so that can be according to the
The external interference signal that two microphones 130 collect estimates the external world that the first microphone 120 is collected in signal and done exactly
Signal is disturbed, the purpose is to eliminate influence of the external interference signal to heart rate detection.First microphone 120 and second microphone 130
External interference signal will be detected, although both signal periods are consistent, amplitude can be variant, it is therefore desirable to using adaptive
Wave filter is answered to eliminate this species diversity, enabling eliminated in the signal for collecting external interference signal from the first microphone 120,
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 the first microphone in earphone 100
120, so as to reduce the interference of outside noise, and enhance the signal message that the first microphone 120 collects.But external interference
Still have, on the other hand, this, which can be detected, adds second microphone 130 to gather external interference signal in the earphone 100 of heart rate, it is right
The signal that second microphone 130 gathers carries out adaptive-filtering, and adaptive filter is subtracted from the signal of the first microphone 120 collection
Second microphone signal after ripple, then heart rate detection is carried out, so as to further obviate external interference signal to heart rate detection
Influence.
In one embodiment of the invention, the earphone shown in Fig. 1 further comprises low pass filter, for the first wheat
The signal that gram wind 120 collects carries out low-pass filtering treatment, is exported again to subtrator 150 after obtaining low-pass filter signal.I.e.
Subtrator 150, for subtracting the estimation signal of the output of adaptive-filtering unit 140 from low-pass filter signal, obtain heart rate
Related signal output is to heart rate detection unit 160.Because the frequency of pulsatile motion is relatively low (0.3Hz-3Hz or so), and
Outside noise frequency is higher, and according to this feature, the influence of outside high-frequency noise can be eliminated by low pass filter.For example,
Low pass filter can 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 (the first microphone in the application) 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
Devise a kind of small cavity be used for place the first microphone 120.Referring to Fig. 2A and Fig. 2 B, the scope in figure shown in dotted line is internal
The signal of the position of cavity 110.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 is located at the position that auricle is pressed close at earphone edge, and earphone has individual perforate 111 at the position that it is bonded with cavity, in earphone
When being worn, this perforate 111 and auricle are brought into close contact, so, cavity 110 and the auricle part that is adjacent to form one it is closed
Space.First microphone 120 is arranged in the cavity 110, the contraction vibration of auricle wall can cause the change of pressure in cavity 110
Change, then the first microphone 120 will collect the change information of pressure in cavity 110, and the information reflects to a certain extent
The jumping frequency rate of heart, therefore can carry out heart rate detection accordingly.
Fig. 3 is the schematic diagram of the riding position of the second microphone in one embodiment of the invention.Due to the motion of human body
The skin of human body can be made to vibrate therewith, the device of second microphone 130 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 second microphone impacts, improve the standard of second microphone collection signal
Exactness.Referring to Fig. 3, second microphone 130 can be arranged in the engaging lug chain-drive section of earphone and the earphone handle of earphone cord, such as schemed
Any one position for the earphone that dotted line frame shown in 3 illustrates.
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 the first microphone.In general the pulse pressure fluctuation of blood vessel is very faint, and closed space is got over
Greatly, then the pressure change that the first microphone detects is smaller, in order to increase the pressure change intensity that the first microphone detects,
By the first microphone apparatus in a closed small cavity, duct is close in the part, because the pulse pressure fluctuation of blood vessel causes
Ear wall, which produces, shrinks vibration, and this vibrates the change for causing the first microphone in small cavity to detect pressure.And small cavity
Design can reduce the influence of external interference signal to a certain extent.
Even if earphone can occupy whole duct, completely enclosed cavity is formed, the infrasound that the external world is widely present is to the heart
The influence of rate detection is also inevitable, because infrasound has the strong penetration power of body.Therefore this external interference signal meeting
Detected by the first microphone.So, the data that the first microphone collects not only include because the pulse pressure of blood vessel fluctuates production
Raw pressure changing information, while include external interference signal.Done to eliminate this by the external world that the first microphone collects
Disturb influence of the signal to heart rate detection, the present invention adds second microphone in earphone, second microphone device in earphone not
The position of skin is contacted, than the earphone position shown in dotted line frame as shown in Figure 3.External interference is gathered using second microphone
Signal.The external interference signal that the external interference signal and second microphone that first microphone collects collect has very strong
Correlation, certain wave filter can be used to eliminate the influence of external interference signal based on this.
According to analysis above, if external interference signal is filtered out in the signal that can be detected from the first microphone, then
It can be obtained by because blood flow causes signal caused by duct autogenous shrinkage, this signal is relevant with heartbeat frequency, base
Heart rate information is obtained in this signal.
The external interference signal that the external interference signal and the first microphone that second microphone collects collect has very
Strong correlation, but the two is not fully equivalent, it is impossible to remove in the signal for directly collecting the signal from the first microphone,
Therefore the present embodiment filters out interference caused by outside noise by the method for adaptive-filtering.
In summary, in the embodiment of the present invention：First, the first microphone is disposed using the airtight cavity of small volume,
Outside noise interference is reduced, and enhances the signal message that the first microphone detects.Secondly, second is added in earphone
Microphone, people's external interference is further eliminated to the heart for gathering external interference signal, and by designing sef-adapting filter
The influence of rate detection.Furthermore according to the characteristics of pulsatile motion frequency, low pass filter is devised, the external world is further reduced and makes an uproar
The influence of sound.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, it is arranged on
The second microphone 430 of the opening position for not contacting wearer's skin in earphone, adaptive-filtering unit 440, it is arranged on earphone
Interior cavity 410 and the first microphone 420 in cavity 410.Wherein, adaptive-filtering unit 440 includes：Parameter can
Tunable 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.
First microphone 420, for when earphone 400 is worn, gather in cavity 410 as caused by pressure change
Signal is simultaneously exported to low pass filter 470.As pressure change caused by signal of first microphone 420 in collection cavity 110
While can collect external interference signal.
Low pass filter 470, the signal for being collected to the first microphone 420 carry out low-pass filtering treatment, obtained low
Exported again to subtrator 450 after bandpass filtered signal.
Second microphone 430, adaptive-filtering list is given for when earphone is worn, gathering external interference signal and exporting
Parameter adjustable wave filter 441 and parameter adaptive adjustment unit 442 in member 440.
Parameter adaptive adjustment unit 442, for signal, the letter of heart rate correlation collected according to second microphone 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 second microphone 430 carry out adaptive
Filtering, the estimation signal of external interference signal in the signal that the first microphone 420 collects is exported to 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 heart rate correlation
Signal output is to parameter adaptive adjustment unit 442.
Here the signal and subtraction list that parameter adaptive adjustment unit 442 gathers according to the second microphone 430 of input
The signal of the heart rate correlation of the feedback of member 450, 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 second microphone collects is filtered
Processing, accurately to estimate the external interference signal that the first microphone collects.As shown in figure 4, y1 (n) is second microphone
430 signals collected, as answer the input signal in adaptive-filtering unit 440, and y2 (n) is adaptive-filtering unit 440
Output signal, xL (n) represent corresponding to desired signal,Corresponding error signal (mainly including heart rate signal).YL (n) and
Y1 (n) has certain correlation, can be by designing suitable transmission function, make it that y1 (n) is defeated after device after filtering
Go out signal y2 (n) and approach yL (n).Such as can be according to minimum mean square error criterion, when the square desired value of error signal is minimum
When, output signal y2 (n) can effectively estimate yL (n), then can does external interference noise to heart rate detection afterwards
Disturb and removed in the signal collected from the first microphone, remove the influence of external interference signal again.First microphone is through too low
Signal after pass filter subtracts signal of the second microphone after adaptive-filtering, obtains the signal message related to heart rateThe detection of heart rate is carried out based on this.The bounce of heart has certain periodicity, thenIt is that there is certain week
The signal of phase property, 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 the first microphone detects is：X (n)=y (n)+d (n), the signal that second microphone detects are
y1(n)。
Wherein, y (n) represents the external interference signal that the first microphone collects, and d (n) is represented by blood flow is produced
Raw pressure change signal；Y1 (n) represents the external interference signal that second microphone collects, and n represents sampling time point.
X (n) signals after LPF are changed into：XL (n)=yL (n)+dL (n).
Y1 (n) and y (n) is external interference signal, is the external interference letter of second microphone collection corresponding to y1 (n)
Number, the external interference signal that the first microphone corresponding to y (n) gathers, although amplitude is different corresponding to both, there is identical
Vibration frequency.In order to which y (n) is eliminated from x (n), sef-adapting filter (shock response is h (n)) is selected to filter y1 (n)
Ripple, y2 (n)=y1 (n) * h (n) are obtained, make external interference signals of the y2 (n) close to x (n) after LPF
yL(n)。
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.
The heart rate of people can be obtained by the earphone in Fig. 1 or embodiment illustrated in fig. 4, to obtain the health status of people letter
Breath, or people as the case may be can control the amount of exercise of oneself in a suitable scope on this basis.
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, the first microphone is arranged in cavity；The mouth and earphone of cavity
The position of shell fitting is the position for the ear casing being bonded when earphone is worn with the auricle of human ear；The ear that the mouth of cavity is bonded
There is perforate at casing, cavity and the auricle being bonded with perforate form confined space when earphone is worn；Not connecing in earphone
The opening position for touching wearer's skin also sets up second microphone.
For example, second microphone is arranged in the engaging lug chain-drive section of earphone and the earphone handle of earphone cord, referring to Fig. 3.
Step S602, when earphone is worn, as the signal as caused by pressure change in microphone acquisition cavity body, by
Two microphones gather external interference signal；
Step S603, the signal collected to second microphone carry out adaptive-filtering processing, obtain first Mike's elegance
The estimation signal of external interference signal in the signal collected.
Step S604, the estimation signal is subtracted in the signal collected from the first 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 in the signal collected from the first microphone
Estimate signal, obtain further comprising before the related signal of heart rate：The signal collected to the first microphone carries out low pass filtered
Ripple processing, obtains low-pass filter signal.Estimation letter is then subtracted in the signal collected from the first microphone in step S604
Number, obtain the related signal of heart rate and specifically include：The estimation signal is subtracted from low-pass filter signal, obtains the related letter of heart rate
Number.
In one embodiment of the invention, the signal collected in step S603 to second microphone is adaptively filtered
Ripple processing, obtaining the estimation signal of the external interference signal in the signal that the first microphone collects includes：
Signal, the related signal of heart rate and the default adaptive algorithm collected according to second microphone calculates adaptive
Answer filtering parameter；
The signal collected according to adaptive-filtering parameter to second microphone carries out adaptive-filtering and obtains estimation letter
Number.
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 the first microphone, reduces outside noise interference, and strengthen
The signal message that first microphone detects.
(2) second microphone is added in earphone, for gathering external interference signal, and by designing adaptive-filtering
Device further eliminates influence of the external interference signal 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, the first microphone is arranged in the cavity；The mouth of the 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 that the mouth of the cavity is bonded
There is perforate at casing, the cavity and the auricle being bonded with the perforate form confined space when earphone is worn；
The opening position for not contacting wearer's skin in earphone also sets up second microphone；
When earphone is worn, the signal as caused by pressure change in the cavity is gathered as first microphone, by institute
State second microphone collection external interference signal；
The signal collected to the second microphone carries out adaptive-filtering processing, obtains the signal that the first microphone collects
In external interference signal estimation signal；
The estimation signal is subtracted in the signal collected from the first 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 the first microphone, before obtaining the related signal of heart rate, the party
Method further comprises：The signal collected to first microphone carries out low-pass filtering treatment, obtains low-pass filter signal；
The estimation signal is subtracted in the signal collected from the first microphone, the related signal of heart rate is obtained and specifically wraps
Include：The estimation signal is subtracted from 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 second microphone enters
The processing of row adaptive-filtering, obtaining the estimation signal of the external interference signal in the signal that the first microphone collects includes：
Signal, the related signal of heart rate and the default adaptive algorithm collected according to second microphone calculates adaptive filter
Wave parameter；
The signal collected according to the adaptive-filtering parameter to second microphone carries out adaptive-filtering and obtains the estimation
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 opening position for not contacting wearer's skin in earphone
Also setting up second microphone includes：
Second microphone is arranged in the engaging lug chain-drive section of earphone and the earphone handle of earphone cord.
6. a kind of earphone that can detect heart rate, it is characterised in that the earphone includes：It is subtrator, heart rate detection unit, adaptive
Filter unit, the cavity being arranged in earphone, the first microphone in the cavity, and be arranged in earphone not
Contact the second microphone of the opening position of wearer's skin；
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；
First microphone, for when earphone is worn, gathering the signal as caused by pressure change in the cavity simultaneously
Export to subtrator；
The second microphone, for when earphone is worn, gathering external interference signal and exporting to the adaptive-filtering
Unit；
The adaptive-filtering unit, the signal for being collected according to the related signal of heart rate to the second microphone are carried out
Adaptive-filtering processing, is exported to institute after obtaining the estimation signal of the external interference signal in the signal that the first microphone collects
State subtrator；
The subtrator, for subtracting the estimation signal in the signal that is collected from the first microphone, obtain heart rate correlation
Signal output give 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 first 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 second microphone, for giving the signal output collected to the Parameter adjustable wave filter and the parameter adaptive
Adjustment unit；
The subtrator, for giving the related signal output of the heart rate to the parameter adaptive adjustment unit；
The parameter adaptive adjustment unit, the related signal of signal, heart rate for being collected according to second microphone and
Default adaptive algorithm goes to adjust the filtering parameter of the Parameter adjustable wave filter；
The Parameter adjustable wave filter, the signal for being gathered using filtering parameter to second microphone carry out adaptive-filtering,
The estimation signal of the external interference signal in the signal that the first microphone collects is exported to the 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 second microphone is arranged in the engaging lug chain-drive section of earphone and the earphone handle of earphone cord.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410422000.0A CN104244125B (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 |
| DK15810777.1T DK3010249T3 (en) | 2014-07-24 | 2015-05-29 | METHOD OF DETECTING HEART RATE IN HEADPHONE AND HEADPHONE THAT CAN DETECT HEART RATE |
| PCT/CN2015/080201 WO2016011848A1 (en) | 2014-07-24 | 2015-05-29 | Heartrate detection method applicable in headphone and headphone capable of detecting heartrate |
| KR1020157036699A KR101660670B1 (en) | 2014-07-24 | 2015-05-29 | Heart rate detection method used in earphone and earphone capable of detecting heart rate |
| US14/901,564 US9635458B2 (en) | 2014-07-24 | 2015-05-29 | Heart rate detection method used in earphone and earphone capable of detecting heart rate |
| JP2015563108A JP6082131B2 (en) | 2014-07-24 | 2015-05-29 | Heart rate detection method applied to earphone and earphone capable of detecting heart rate |
| EP15810777.1A EP3010249B1 (en) | 2014-07-24 | 2015-05-29 | Heartrate detection method applicable in headphone and headphone capable of detecting heartrate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410422000.0A CN104244125B (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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| CN104244125A CN104244125A (en) | 2014-12-24 |
| CN104244125B true CN104244125B (en) | 2018-01-09 |
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| JP6082131B2 (en) * | 2014-07-24 | 2017-02-15 | 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 |
| CN105451115B (en) | 2016-01-05 | 2019-04-30 | 深圳市汇顶科技股份有限公司 | A kind of earphone with biological characteristic detection function, interactive system and method |
| 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 |
| DE102017209767A1 (en) * | 2017-06-09 | 2018-12-13 | Neuroloop GmbH | Device for sensory detection of at least one human vital parameter |
| US10632278B2 (en) * | 2017-07-20 | 2020-04-28 | Bose Corporation | Earphones for measuring and entraining respiration |
| CN108391207A (en) * | 2018-03-30 | 2018-08-10 | 广东欧珀移动通信有限公司 | Data processing method, device, terminal, earphone and readable storage medium storing program for executing |
| CN113613134B (en) * | 2021-08-05 | 2023-11-07 | 北京安声浩朗科技有限公司 | earphone |
| CN113679345B (en) * | 2021-08-13 | 2022-06-14 | 珠海格力电器股份有限公司 | Sleep monitoring method, device and system and storage medium |
| CN114246572A (en) * | 2021-11-30 | 2022-03-29 | 歌尔科技有限公司 | Earphone set |
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