CN104244126B - A kind of heart rate detection method for being applied to earphone and the earphone that heart rate can be detected - Google Patents
A kind of heart rate detection method for being applied to earphone and the earphone that heart rate can be detected Download PDFInfo
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- CN104244126B CN104244126B CN201410422876.5A CN201410422876A CN104244126B CN 104244126 B CN104244126 B CN 104244126B CN 201410422876 A CN201410422876 A CN 201410422876A CN 104244126 B CN104244126 B CN 104244126B
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Abstract
The invention discloses a kind of heart rate detection method for being applied to earphone and the earphone that heart rate can be detected.The method includes：One cavity is set in earphone, the first microphone is arranged in the cavity；Second microphone is set in the earphone head of earphone；The signal collected to second microphone carries out adaptive-filtering treatment, obtains the estimation signal of the signal that the earphone horn in the signal that the first microphone is collected is produced；The estimation signal is subtracted in the signal collected from the first microphone, the related signal of heart rate is obtained；Heart rate detection is carried out according to the signal that heart rate is related.Technical scheme, the first microphone is disposed using closed chamber, reduce the interference of outside noise, and to second microphone collection signal carry out adaptive-filtering obtain estimate signal, the estimation signal is subtracted from the signal of the first microphone collection, heart rate detection is carried out again, so as to eliminate influence of the signal of earphone horn generation 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 for being 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 is increasingly improved, and people also increasingly pay close attention to certainly
Oneself health.And heart rate detection will give people to provide the very important information on health.It is any different from normal cardiac rate
Display all shows that health there is a problem, can in time find whether our body there is a problem by heart rate detection.The heart
Rate detection can also to a certain extent reflect whether the exercise intensity of people is suitable, in order to obtain optimal exercise effect
Really, should be maintained at for heart rate during the exercise in certain scope by 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.
Detect that the technology of heart rate just occurred in recent years using earphone.23 to 25 October in 2013, Japan is 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 and forms closing space using earphone, 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, cause microphone to detect
Less than the change of pressure.
Additionally, using headset detection heart rate also there is a problem of one it is important, be exactly inevitably be subject to earphone horn
The influence of the signal (such as music or voice etc.) of generation, 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 for being 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 for being applied to earphone, the method includes：
One cavity is set in earphone, the first microphone is arranged in the cavity；The mouth and earphone of the cavity
Shell laminating position be, the position of the ear casing fitted with the auricle of human ear when earphone is worn；The mouth of the cavity is fitted
Ear casing at have perforate, when earphone is worn, the cavity and the auricle fitted with the perforate constitute confined space；
Second microphone is also set up in the earphone head of earphone；
When earphone is worn, the signal produced by pressure change in the cavity is gathered by first microphone,
The signal produced by second microphone collection earphone head inner ear machine loudspeaker；
Adaptive-filtering treatment is carried out to the signal that the second microphone is collected, obtains what the first microphone was collected
The estimation signal of the signal that the earphone horn in signal is produced；
The estimation signal is subtracted in the signal collected from the first microphone, the related signal of heart rate is obtained；
Heart rate detection is carried out according to the signal that the heart rate is related.
Alternatively, the estimation signal is subtracted in the signal collected from the first microphone, the related letter of heart rate is obtained
Number before, the method is further included：Low-pass filtering treatment is carried out to the signal that first microphone is collected, low pass is obtained
Filtering signal；
The estimation signal is subtracted in the signal collected from the first microphone, the related signal of heart rate is obtained specific
Including：The estimation signal is subtracted from the low-pass filter signal, the related signal of heart rate is obtained.
Alternatively, it is described that adaptive-filtering treatment is carried out to the signal that the second microphone is collected, obtain the first wheat
The estimation signal of the signal that the earphone horn in the signal that gram wind is collected is produced includes：
Signal, the signal of heart rate correlation and the default adaptive algorithm collected according to second microphone calculate adaptive
Answer filtering parameter；
The signal collected to second microphone according to the adaptive-filtering parameter is carried out described in adaptive-filtering obtains
Estimate signal.
Alternatively, 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 for detecting.
Alternatively, also setting up second microphone in the earphone head in earphone includes：
Second microphone is arranged on the front of the vibrating diaphragm of earphone horn and there is gap between second microphone and vibrating diaphragm,
So that when second microphone is located at earphone horn sounding on the path of Acoustic Wave Propagation, and second microphone and the mutual not shadow of earphone horn
Ring.
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
Earphone head in second microphone；
Wherein, the position that the mouth of the cavity is fitted with ear casing is fitted with the auricle of human ear when earphone is worn
The position of ear casing；Have perforate at the ear casing that the mouth of the cavity is fitted, when earphone is worn the cavity and with institute
The auricle for stating perforate laminating constitutes confined space；
First microphone, for when earphone is worn, gathering the letter produced by pressure change in the cavity
Number and export to subtrator；
The second microphone, for when earphone is worn, the signal of collection earphone horn generation simultaneously to be exported to described
Adaptive-filtering unit；
The adaptive-filtering unit, for the signal collected to the second microphone according to the related signal of heart rate
Adaptive-filtering treatment is carried out, the estimation signal of the signal that the earphone horn in the signal that the first microphone is collected is produced is obtained
After export to the subtrator；
The subtrator, for subtracting the estimation signal in the signal that is collected from the first microphone, obtains 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 is further included：Low pass filter, for entering to the signal that first microphone is collected
Row 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, obtains 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 the signal output that will collect to the Parameter adjustable wave filter and the parameter from
Adapt to adjustment unit；
The subtrator, for giving the parameter adaptive adjustment unit by the related signal output of the heart rate；
The parameter adaptive adjustment unit, for the signal, the signal of heart rate correlation that are 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 carrying out self adaptation filter to the signal that second microphone is gathered using filtering parameter
Ripple, exports the estimation signal of the signal that the earphone horn in the signal that the first microphone is collected is produced 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 for going out obtains heart rate.
Alternatively, the second microphone is arranged on the front of the vibrating diaphragm of earphone horn and between second microphone and vibrating diaphragm
With gap, so that when second microphone is located at earphone horn sounding on the path of Acoustic Wave Propagation, and second microphone and earphone
Loudspeaker are independent of each other.
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 reduces the interference of outside noise, and enhances the first microphone and collect to dispose the first microphone
Signal message.But the first microphone can inevitably collect the signal of earphone horn generation, in this regard, being added in earphone
Second microphone gathers the signal of earphone horn generation, and carrying out adaptive-filtering to the signal of second microphone collection obtains
The estimation signal of the signal that the earphone horn in the first microphone collection signal is produced, subtracts from the signal of the first microphone collection
The estimation signal is removed, then carries out heart rate detection, so as to eliminate influence of the signal of earphone horn generation to heart rate detection, reached
Obtain the purpose of accurate heart rate.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the 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 the 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 the heart rate detection method for being applied to earphone in the embodiment of the present invention.
Specific 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 the earphone that can detect heart rate in the embodiment of the present invention.As shown in figure 1, the energy
Detecting the earphone 100 of 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 the earphone head of earphone
Two microphones 130；
Wherein, the position that the mouth of cavity 110 is fitted with ear casing is, the ear fitted with the auricle of human ear when earphone is worn
The position of casing；There is perforate at the ear casing that the mouth of cavity 110 is fitted, cavity and fitted with perforate when earphone is worn
Auricle constitutes confined space.
First microphone 120, for when earphone 100 is worn, gathering the letter produced by pressure change in cavity 110
Number and export to subtrator 150.
Second microphone 130, for when earphone is worn, the signal of collection earphone horn generation simultaneously to be exported to self adaptation
Filter unit 140.
Adaptive-filtering unit 140, for being entered to the signal that second microphone 130 is collected according to the related signal of heart rate
The treatment of row adaptive-filtering, obtains the estimation letter of the signal that the earphone horn in the signal that the first microphone 120 is collected is produced
Exported after number to subtrator 150.
Subtrator 150, the estimation for subtracting the output of adaptive-filtering unit 140 from the signal that microphone is collected
Signal, obtains the related signal output of heart rate 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 earphone while the signal produced by pressure change in cavity 110 is gathered
The signal that loudspeaker are produced.Therefore adaptive-filtering treatment is carried out to the signal that second microphone 130 is detected in Fig. 1 so that energy
The signal that the earphone horn collected according to second microphone 130 is produced estimates the first microphone 120 and collects letter exactly
The signal that earphone horn in number is produced, the purpose is to eliminate influence of the signal of earphone horn generation to heart rate detection.First
Microphone 120 and second microphone 130 can all detect the signal of earphone horn generation, although both signal periods are consistent,
But amplitude can be variant, it is therefore desirable to eliminate this species diversity using sef-adapting filter, enabling earphone horn is produced
Eliminated in the signal that signal is collected 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 in earphone 100 to dispose the first microphone
120, so as to reduce the interference of outside noise, and enhance the signal message that the first microphone 120 is collected.But the first Mike
Wind 120 inevitably collects the signal of earphone horn generation, in this regard, this is added in detecting the earphone 100 of heart rate
Second microphone 130 come gather earphone horn generation signal, to second microphone 130 collection signal carry out self adaptation filter
Ripple, subtracts the second microphone signal after adaptive-filtering, then carry out heart rate inspection from the signal of the collection of the first microphone 120
Survey, so as to further obviate influence of the signal of earphone horn generation to heart rate detection.
In one embodiment of the invention, the earphone shown in Fig. 1 further includes low pass filter, for the first wheat
The signal that gram wind 120 is collected carries out low-pass filtering treatment, is exported again to subtrator 150 after obtaining low-pass filter signal.I.e.
Subtrator 150, the estimation signal for subtracting the output of adaptive-filtering unit 140 from low-pass filter signal, obtains 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, 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 FIR filter that cut-off frequency is 5Hz etc..
In the technology of existing headset detection heart rate, usual microphone is directly placed in earphone just to the position of duct
Put, the ear cavity pressure change information for gathering eardrum generation, 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 figure of the invention
The mounting means of another microphone (the first microphone in the application) is devised in earphone shown in 1, specifically be 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.During Fig. 2 C are 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 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.Fitted referring to the opening of Fig. 2 C cavitys 110 and ear casing.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 itself and cavity are fitted, 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 constitute 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 accordingly carry out heart rate detection.
Fig. 3 is the schematic diagram of the riding position of the second microphone in one embodiment of the invention.Second in the present embodiment
The device of microphone 130 is in the earphone head of earphone.Referring to Fig. 3, second microphone 130 can be arranged on earphone 100 such as Fig. 3
Shown position, at this moment earphone horn and earphone outer covering mutual cooperation, a cavity, the second wheat are formed in the front of earphone horn
Gram wind 130 can be set in the cavity.It is preferred that second microphone 130 is arranged on the front of the vibrating diaphragm of earphone horn and
Between two microphones 130 and vibrating diaphragm have gap so that second microphone be located at earphone horn sounding when Acoustic Wave Propagation path
On, and second microphone is independent of each other with earphone horn.
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 is detected is smaller, in order to increase the pressure change intensity that the first microphone is detected,
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 is produced and shrinks vibration, and this vibration causes the first microphone in small cavity to detect the change of pressure.And small cavity
Design can reduce the influence of the signal of earphone horn generation to a certain extent.
Even if earphone can occupy whole duct, completely enclosed cavity, but the signal that earphone horn is produced are formed to the heart
The influence of rate detection is also inevitable, because earphone horn is included in earphone head.Therefore this earphone horn is produced
Signal inevitably detected by the first microphone.So, the data that the first microphone is collected not only include by
In the pressure changing information that the pulse pressure fluctuation of blood vessel is produced, while including the signal of earphone horn generation.In order to eliminate the quilt
Influence of the signal that the earphone horn that first microphone is collected is produced to heart rate detection, the present invention adds the second wheat in earphone
Gram wind, second microphone device in earphone head, than earphone position as shown in Figure 3.Ear is gathered using second microphone
The signal that machine loudspeaker are produced.The earphone that the signal and second microphone that the earphone horn that first microphone is collected is produced are collected
The signal that loudspeaker are produced has very strong correlation, and can eliminate earphone horn using certain wave filter based on this produces
Signal influence.
According to analysis above, if the letter of earphone horn generation is filtered in the signal that can be detected from the first microphone
Number, then can be obtained by due to the signal that blood flow causes duct autogenous shrinkage to produce, this signal and heartbeat frequency
It is relevant, heart rate information is obtained based on this signal.
The earphone horn that the signal and the first microphone that the earphone horn that second microphone is collected is produced are collected is produced
Signal there is very strong correlation, but the two is not fully equivalent, it is impossible to directly the signal is collected from the first microphone
Signal in remove, therefore the present embodiment filters the interference produced by outside noise by the method for adaptive-filtering.
In sum, 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 is detected.Secondly, second is added in earphone
Microphone, for gathering the signal of earphone horn generation, and eliminates earphone horn generation by designing sef-adapting filter
Influence of the signal to heart rate detection.Furthermore, according to the characteristics of pulsatile motion frequency, low pass filter is devised, further reduce
The influence of outside noise.It is further detailed by taking Fig. 4 as an example below.
Fig. 4 is a kind of structural representation of the earphone that can detect heart rate in another embodiment of the invention.Such as Fig. 4 institutes
Show, this can detect that the earphone 400 of heart rate includes：Subtrator 450, heart rate detection unit 460, low pass filter 470, it is arranged on
Second microphone 430, adaptive-filtering unit 440 in the earphone head of earphone, the cavity 410 being arranged in earphone and install
The first microphone 420 in cavity 410.Wherein, adaptive-filtering unit 440 includes：Parameter adjustable wave filter 441 and parameter
Self-adaptative adjustment unit 442.
Wherein, the position that the mouth of cavity 410 is fitted with ear casing is, the ear fitted with the auricle of human ear when earphone is worn
The position of casing；There is perforate at the ear casing that the mouth of cavity 410 is fitted, cavity and fitted with perforate when earphone is worn
Auricle constitutes confined space.
First microphone 420, for when earphone 400 is worn, in collection cavity 410 as produced by pressure change
Signal is simultaneously exported to low pass filter 470.The signal that by pressure change is produced of first microphone 420 in collection cavity 110
While can collect earphone horn generation signal.
Low pass filter 470, for carrying out low-pass filtering treatment to the signal that the first microphone 420 is collected, obtains low
Exported again to subtrator 450 after bandpass filtered signal.
Second microphone 430, for when earphone is worn, the signal of collection earphone horn generation simultaneously to be exported to self adaptation
Parameter adjustable wave filter 441 and parameter adaptive adjustment unit 442 in filter unit 440.
Parameter adaptive adjustment unit 442, for the signal, the letter of heart rate correlation that are 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, for carrying out self adaptation to the signal that second microphone 430 is gathered using filtering parameter
Filtering, exports the estimation signal of the signal that the earphone horn in the signal that the first microphone 420 is collected is produced to subtrator
450。
Subtrator 450, for subtracting estimating for the output of Parameter adjustable wave filter 441 from the signal that low pass filter is exported
Meter signal, obtains the related signal output of heart rate to heart rate detection unit 460；Subtrator 450, is additionally operable to heart rate correlation
Signal output is to parameter adaptive adjustment unit 442.
Here parameter adaptive adjustment unit 442 is gathered according to the second microphone 430 of input signal and subtraction list
The signal of the heart rate correlation of the feedback of unit 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 is carried out
Detection, heart rate is obtained by the inverse in the cycle of the signal for detecting.For example, heart rate detection unit 460, it is possible to use 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 is main can by parameter
Parameter adaptive adjustment unit two parts of tunable filter and adjustment filter coefficient are constituted.Sef-adapting filter design when not
The prior knowledge for knowing the statistical property for having OFF signal is needed, it " can gradually understand " or estimate 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 () 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 causes that the mean square error of e (n) is minimum, and now output signal most approaches desired signal.
In the earphone shown in Fig. 4, employ sef-adapting filter and the signal that second microphone is collected is filtered
Treatment, the signal that the earphone horn collected with accurately estimating the first microphone is produced.As shown in figure 4, y1 (n) is the second wheat
The signal that gram wind 430 is collected, as answers the input signal in adaptive-filtering unit 440, and y2 (n) is adaptive-filtering unit
440 output signal, xL (n) represents corresponding desired signal,Correspondence error signal (mainly including heart rate signal).yL
N () and y1 (n) have certain correlation, can cause y1 (n) after filtering after device by designing suitable transmission function
Output signal y2 (n) approach yL (n).Such as can be according to minimum mean square error criterion, when the square desired value of error signal
When minimum, output signal y2 (n) can be used to effectively estimate yL (n), then the signal that can just produce earphone horn afterwards
Removed in the signal that interference to heart rate detection is collected from the first microphone.First microphone is by the signal after LPF
Second microphone is subtracted by the signal after adaptive-filtering, the signal message related to heart rate is obtainedBased on this
Carry out the detection of heart rate.The bounce of heart has certain periodicity, thenIt is the signal with some cycles, according to
Autocorrelation method can obtain the signal corresponding cycle, and the inverse in cycle is heart rate.
Detailed process is as follows：
It is assumed that the signal that the first microphone is detected is：X (n)=y (n)+d (n), the signal that second microphone is detected is
y1(n)。
Wherein, y (n) represents the signal that the earphone horn that the first microphone is collected is produced, and d (n) is represented due to blood stream
Move produced pressure change signal；Y1 (n) represents the signal that the earphone horn that second microphone is collected is produced, and n is represented and adopted
Sample time point.
X (n) is changed into by signal after LPF：XL (n)=yL (n)+dL (n).
Y1 (n) and y (n) are the signals that earphone horn is produced, and it is the earphone loudspeaker of second microphone collection that y1 (n) is corresponding
The signal of generation, the signal of the earphone horn generation of the corresponding first microphone collections of y (n), although both corresponding amplitudes
Difference, but with identical vibration frequency.In order to y (n) is eliminated from x (n), (shock response is h to selection sef-adapting filter
(n)) y1 (n) is filtered, y2 (n)=y1 (n) * h (n) is obtained, make y2 (n) close to x (n) by LPF
Signal yL (n) that earphone horn afterwards is produced.
Can be so expressed as because duct shrinks the signal for producing：
The auto-adaptive parameter of wave filter is obtained using adaptive algorithm, and the method for realizing adaptive algorithm is a lot, such as
Can be caused using the minimum method of mean square errorTake the filter coefficient obtained during minimum value.
Try to achieveAfterwards, according to the periodic characteristics of the signal, it is possible to use autocorrelation method, threshold method etc. came to its week
Phase is detected that the inverse in its cycle is exactly heart rate.
The heart rate of people is obtained in that by the earphone in Fig. 1 or embodiment illustrated in fig. 4, so that the health status for obtaining people is believed
Breath, or people as the case may be can be controlled in a suitable scope amount of exercise of oneself on this basis.
The heart rate detection method for being applied to earphone in the present invention, the inventive method embodiment are given based on above-described embodiment
In the particular content of each step may refer to the associated description of product embodiments of the present invention.
Fig. 6 is a kind of flow chart of the heart rate detection method for being applied to earphone in the embodiment of the present invention.As shown in fig. 6, should
Method includes：
Step S601, sets a cavity in earphone, and the first microphone is arranged in cavity；The mouth and earphone of cavity
Shell laminating position be, the position of the ear casing fitted with the auricle of human ear when earphone is worn；The ear that the mouth of cavity is fitted
There is perforate at casing, cavity and the auricle fitted with perforate constitute confined space when earphone is worn；In the earphone heads of earphone
Second microphone is also set up in portion.
For example, the position of close loudspeaker louver second microphone being arranged in earphone head, referring to Fig. 3.
Step S602, when earphone is worn, by the signal produced by pressure change in microphone acquisition cavity body, by the
The signal that two microphones collection earphone head inner ear machine loudspeaker are produced；
Step S603, the signal collected to second microphone carries out adaptive-filtering treatment, obtains first Mike's elegance
The estimation signal of the signal that the earphone horn in the signal for collecting is produced.
Step S604, subtracts the estimation signal 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 signal that heart rate is related.
In one embodiment of the invention, the method shown in Fig. 6 is subtracted in the signal collected from the first microphone
Estimate signal, obtain being further included before the related signal of heart rate：Low pass filtered is carried out to the signal that the first microphone is collected
Ripple treatment, 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, the related letter of heart rate is obtained
Number.
In one embodiment of the invention, the signal for being collected to second microphone in step S603 carries out self adaptation filter
Ripple treatment, the estimation signal for obtaining the signal that the earphone horn in the signal that the first microphone is collected is produced includes：
Signal, the signal of heart rate correlation and the default adaptive algorithm collected according to second microphone calculate adaptive
Answer filtering parameter；
The signal collected to second microphone according to adaptive-filtering parameter 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 detected, heart rate is obtained by the inverse in the cycle of the signal for detecting.
In one embodiment of the invention, second microphone is also set up in the earphone head in earphone specifically can be with
For：Second microphone is arranged on the front of the vibrating diaphragm of earphone horn and there is gap between second microphone and vibrating diaphragm, so that
When second microphone is located at earphone horn sounding on the path of Acoustic Wave Propagation, and second microphone is independent of each other with earphone horn.
The beneficial effect of technical solution of the present invention includes in sum：
(1) employ the airtight cavity of small volume to dispose the first microphone, reduce outside noise interference, and strengthen
The signal message that first microphone is detected.
(2) second microphone is added in earphone, the signal for gathering earphone horn generation, and it is adaptive by designing
Wave filter is answered further to eliminate influence of the signal of earphone horn generation to heart rate detection.
(3) according to the characteristics of pulsatile motion frequency, a kind of low pass filter is devised, further reduces extraneous high frequency and make an uproar
The influence of sound.
Presently preferred embodiments of the present invention is the foregoing is only, 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 for being 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 is pasted with ear casing
The position of conjunction is, the position of the ear casing fitted with the auricle of human ear when earphone is worn；The ear that the mouth of the cavity is fitted
There is perforate at casing, the cavity and the auricle fitted with the perforate constitute confined space when earphone is worn；
Second microphone is also set up in the earphone head of earphone；
When earphone is worn, the signal produced by pressure change in the cavity is gathered by first microphone, by institute
State the signal that second microphone collection earphone head inner ear machine loudspeaker are produced；
Adaptive-filtering treatment is carried out to the signal that the second microphone is collected, the signal that the first microphone is collected is obtained
In earphone horn produce signal estimation signal；
The estimation signal is subtracted in the signal collected from the first microphone, the related signal of heart rate is obtained；
Heart rate detection is carried out according to the signal that the heart rate is related.
2. the method for 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 is further included：Low-pass filtering treatment is carried out to the signal that first microphone is collected, low-pass filter signal is obtained；
The estimation signal is subtracted in the signal collected from the first microphone, the related signal of heart rate is obtained and is specifically wrapped
Include：The estimation signal is subtracted from the low-pass filter signal, the related signal of heart rate is obtained.
3. method as claimed in claim 1 or 2, it is characterised in that described to enter to the signal that the second microphone is collected
The treatment of row adaptive-filtering, obtains the estimation signal bag of the signal that the earphone horn in the signal that the first microphone is collected is produced
Include：
Signal, the signal of heart rate correlation and the default adaptive algorithm collected according to second microphone calculate self adaptation filter
Wave parameter；
The signal collected to second microphone according to the adaptive-filtering parameter 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 for detecting.
5. the method for claim 1, it is characterised in that also set up the second Mike in the earphone head in earphone
Bellows chamber is included：
Second microphone is arranged on the front of the vibrating diaphragm of earphone horn and there is gap between second microphone and vibrating diaphragm, so that
When second microphone is located at earphone horn sounding on the path of Acoustic Wave Propagation, and second microphone is independent of each other with earphone horn.
6. a kind of earphone that can detect heart rate, it is characterised in that the earphone includes：Subtrator, heart rate detection unit, self adaptation
Filter unit, the cavity being arranged in earphone, the first microphone in the cavity, and the earphone for being arranged on earphone
Second microphone in head；
Wherein, the position that the mouth of the cavity is fitted with ear casing is, the earphone fitted with the auricle of human ear when earphone is worn
The position of shell；There is perforate at the ear casing that the mouth of the cavity is fitted, the cavity and opened with described when earphone is worn
The auricle of hole laminating constitutes confined space；
First microphone, for when earphone is worn, gathering the signal by pressure change generation in the cavity simultaneously
Export to subtrator；
The second microphone, for when earphone is worn, the signal of collection earphone horn generation simultaneously to be exported to described adaptive
Answer filter unit；
The adaptive-filtering unit, for being carried out to the signal that the second microphone is collected according to the related signal of heart rate
Adaptive-filtering treatment, obtains defeated after the estimation signal of the signal that earphone horn in the signal that the first microphone is collected is produced
Go out to the subtrator；
The subtrator, for subtracting the estimation signal in the signal that is collected from the first microphone, obtains heart rate related
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 is further included：Low pass filter, for described
The signal that first microphone is collected 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, obtains 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 is filtered
Device and parameter adaptive adjustment unit；
The second microphone, the Parameter adjustable wave filter and the parameter adaptive are given for the signal output that will collect
Adjustment unit；
The subtrator, for giving the parameter adaptive adjustment unit by the related signal output of the heart rate；
The parameter adaptive adjustment unit, for the related signal of the signal that is collected according to second microphone, heart rate and
Default adaptive algorithm goes to adjust the filtering parameter of the Parameter adjustable wave filter；
The Parameter adjustable wave filter, for carrying out adaptive-filtering to the signal that second microphone is gathered using filtering parameter,
The estimation signal of the signal that the earphone horn in the signal that the first microphone is collected is produced 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 detects, 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 on the front of the vibrating diaphragm of earphone horn and has gap between second microphone and vibrating diaphragm, with
When second microphone is located at earphone horn sounding on the path of Acoustic Wave Propagation, and second microphone and the mutual not shadow of earphone horn
Ring.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410422876.5A CN104244126B (en) | 2014-08-25 | 2014-08-25 | A kind of heart rate detection method for being applied to earphone and the earphone that heart rate can be detected |
| KR1020157036699A KR101660670B1 (en) | 2014-07-24 | 2015-05-29 | Heart rate detection method used in 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 |
| DK15810777.1T DK3010249T3 (en) | 2014-07-24 | 2015-05-29 | METHOD OF DETECTING HEART RATE IN HEADPHONE AND HEADPHONE THAT CAN DETECT 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 |
| PCT/CN2015/080201 WO2016011848A1 (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 |
|---|---|---|---|
| CN201410422876.5A CN104244126B (en) | 2014-08-25 | 2014-08-25 | A kind of heart rate detection method for being applied to earphone and the earphone that heart rate can be detected |
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| Publication Number | Publication Date |
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| CN104244126A CN104244126A (en) | 2014-12-24 |
| CN104244126B true CN104244126B (en) | 2017-06-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9635458B2 (en) * | 2014-07-24 | 2017-04-25 | Goertek, Inc. | Heart rate detection method used in earphone and earphone capable of detecting heart rate |
| 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 |
| CN108113706B (en) * | 2017-12-19 | 2021-01-05 | 清华大学无锡应用技术研究院 | Heart rate monitoring method, device and system based on audio signals |
| CH718023A1 (en) * | 2020-10-30 | 2022-05-13 | Rocket Science Ag | Device for detecting heart sound signals from a user and method for checking the heart activity of the user. |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6808473B2 (en) * | 2001-04-19 | 2004-10-26 | Omron Corporation | Exercise promotion device, and exercise promotion method employing the same |
| US7521623B2 (en) * | 2004-11-24 | 2009-04-21 | Apple Inc. | Music synchronization arrangement |
| WO2006033104A1 (en) * | 2004-09-22 | 2006-03-30 | Shalon Ventures Research, Llc | Systems and methods for monitoring and modifying behavior |
| US8652040B2 (en) * | 2006-12-19 | 2014-02-18 | Valencell, Inc. | Telemetric apparatus for health and environmental monitoring |
| US20080171945A1 (en) * | 2007-01-15 | 2008-07-17 | Dotter James E | Apparatus and method for measuring heart rate and other physiological data |
| 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 |
| US8705784B2 (en) * | 2009-01-23 | 2014-04-22 | Sony Corporation | Acoustic in-ear detection for earpiece |
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