CN104244127A - Heart rate detection method applied to ear phone and ear phone capable of detecting heart rate - Google Patents
Heart rate detection method applied to ear phone and ear phone capable of detecting heart rate Download PDFInfo
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- 230000002596 correlated effect Effects 0.000 claims description 7
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Abstract
The invention discloses a heart rate detection method applied to an ear phone and the ear phone capable of detecting the heart rate. The heart rate detection method comprises the steps that a cavity is formed in the ear phone, and a microphone is installed in the cavity; an acceleration sensor is further installed inside the ear phone; adaptive filtering processing is conducted on a signal acquired by the acceleration sensor, so that an estimation signal of a signal, generated by body movement of a wearer, in signals acquired by the microphone is obtained; the estimation signal is subtracted from the signals acquired by the microphone, and a signal related to the heart rate is obtained; heart rate detection is conducted according to the signal related to the heart rate. According to the technical scheme, the microphone is arranged in the airtight cavity, interference from external noise is reduced, signal information acquired by the microphone is intensified, the estimation signal is obtained by conducting adaptive filtering on the signal acquired by the acceleration sensor, the estimation signal is subtracted from the signals acquired by the microphone, then heart rate detection is conducted, and therefore the influence of the body movement of the wearer on heart rate detection can be eliminated.
Description
Technical field
The present invention relates to earphone and heart rate detection technical field, particularly a kind of heart rate detection method of earphone and the earphone of heart rate can be detected of being applied to.
Background technology
Along with socioeconomic development, the living standard of people day by day improves, and people also more and more pay close attention to oneself health.And the very important information that heart rate detection will provide to people about health.Any display being different from normal cardiac rate all shows that problem has appearred in health, whether can occur problem by our health of Timeliness coverage by heart rate detection.Heart rate detection can also reflect that whether the exercise intensity of people is suitable to a certain extent, in order to best train on can be obtained, heart rate should remain in certain scope by people in the process of taking exercise, and heart rate detection can provide an index for rational amount of exercise.
In addition, a lot of people is in the process of motion, and liking listening to the music with earphone, in order to record the heart rate in motion process, do not need again to carry with other equipment, how people utilizes earphone to detect the correlation technique of heart rate if beginning one's study.
Detect the technology of heart rate, except heart rate band, emerging a kind of earphone that utilizes, to detect the technology of heart rate, reaches convenient object accurately again now.
Earphone is utilized just to occur in recent years to the technology detecting heart rate.23 to 25 October in 2013, in the healthy apparatus exhibition in Japanese Yokohama, Kaiteki company and Bifrostec company have put on display a kind of technology that can measure pulse wave with earphone.This technology utilizes earphone to be close to duct and forms enclosure space, due to ear vibration of membrane, in duct, certain pressure can be produced, and pressure changes along with the change of vibration, utilize microphone to gather the change information of duct internal pressure, thus reach the object detecting heart rate.But because earphone can not occupy whole duct, the leakage of gas in duct can be caused, cause microphone to can't detect the change of pressure, and the detection of heart rate can be subject to the interference of outside noise.
Utilize headset detection heart rate, except there are the problems referred to above, also have a key factor, affect the accurate detection to heart rate, i.e. the body kinematics of people.Body kinematics due to people will inevitably cause the vibration of ear wall, and this vibration can cause the change of duct internal pressure equally, and this pressure change can be collected by microphone simultaneously, thus disturbs the analysis to heart rate signal.
Summary of the invention
In view of this, the invention provides a kind of heart rate detection method of earphone and the earphone of heart rate can be detected, to solve the problem or to solve the problem at least in part of being applied to.
The invention discloses a kind of heart rate detection method being applied to earphone, the method comprises:
A cavity is set in earphone, microphone is arranged in cavity; The position that the mouth of cavity and ear casing are fitted is, when earphone is worn and the auricle of the people's ear position of ear casing of fitting; There is perforate at the ear casing place that the mouth of cavity is fitted, the cavity and form confined space with the auricle that perforate is fitted when earphone is worn;
In earphone, also acceleration transducer is set;
When earphone is worn, gathered by microphone and change by pressure the signal produced in cavity, the signal produced due to the body kinematics of wearer by acceleration transducer collection;
Adaptive-filtering process is carried out to the signal that acceleration transducer collects, obtains the estimated signal of the signal produced due to the body kinematics of wearer in the signal that microphone collects;
From the signal that microphone collects, deduct estimated signal, obtain the signal that heart rate is relevant;
The signal relevant according to heart rate carries out heart rate detection.
Alternatively, in the signal collected from microphone, deduct estimated signal, before obtaining the relevant signal of heart rate, the method comprises further: carry out low-pass filtering treatment to the signal that microphone collects, obtain low-pass filter signal;
Above-mentionedly from the signal that microphone collects, deduct estimated signal, the signal obtaining heart rate relevant specifically comprises: from low-pass filter signal, deduct estimated signal, obtains the signal that heart rate is relevant.
Alternatively, above-mentionedly carry out adaptive-filtering process to the signal that acceleration transducer collects, the estimated signal obtaining the signal produced due to the body kinematics of wearer in the signal that microphone collects comprises:
Adaptive-filtering parameter is calculated according to signal, heart rate coherent signal and default adaptive algorithm that acceleration transducer collects;
The signal collected according to adaptive-filtering parameters on acceleration transducer carries out adaptive-filtering and obtains estimated signal.
Alternatively, relevant according to heart rate signal carries out heart rate detection and comprises:
The cycle of the signal that heart rate is correlated with is detected;
Heart rate is obtained by the inverse in the cycle of the signal detected.
Alternatively, the above-mentioned acceleration transducer that also arranges in earphone comprises:
The position that do not contact wearer's skin of degree of will speed up sensor setting in earphone.
The invention also discloses a kind of earphone that can detect heart rate, this earphone comprises: subtrator, heart rate detection unit, acceleration transducer, adaptive-filtering unit, the microphone being arranged on the cavity in earphone and being arranged in cavity;
Wherein, the position that the mouth of cavity and ear casing are fitted is, when earphone is worn and the auricle of the people's ear position of ear casing of fitting; There is perforate at the ear casing place that the mouth of cavity is fitted, the cavity and form confined space with the auricle that perforate is fitted when earphone is worn;
Microphone, for when earphone is worn, gathers changing the signal of generation by pressure and exporting to subtrator in cavity;
Acceleration transducer, for when earphone is worn, gathers signal that the body kinematics due to wearer produces and exports to adaptive-filtering unit;
Adaptive-filtering unit, for carrying out adaptive-filtering process according to heart rate coherent signal to the signal that acceleration transducer collects, after obtaining the estimated signal of the signal produced due to the body kinematics of wearer in the signal that microphone collects, export to subtrator;
Subtrator, deducts estimated signal in the signal that collects from microphone, and the signal obtaining heart rate relevant exports to heart rate detection unit and adaptive-filtering unit;
Heart rate detection unit, carries out heart rate detection for the signal relevant according to heart rate.
Alternatively, this earphone comprises further: low pass filter, carries out low-pass filtering treatment, obtain low-pass filter signal and export to subtrator for the signal collected microphone;
Subtrator, for deducting estimated signal from low-pass filter signal, the signal obtaining heart rate relevant exports to heart rate detection unit.
Alternatively, adaptive-filtering unit comprises: Parameter adjustable filter and parameter adaptive adjustment unit;
Acceleration transducer, for exporting to Parameter adjustable filter and parameter adaptive adjustment unit by the signal collected;
Subtrator, for exporting to parameter adaptive adjustment unit by heart rate coherent signal;
Parameter adaptive adjustment unit, signal, heart rate coherent signal and default adaptive algorithm for collecting according to acceleration transducer remove the filtering parameter adjusting Parameter adjustable filter;
Parameter adjustable filter, for utilizing filtering parameter to carry out adaptive-filtering to the signal of acceleration transducer collection, exports the estimated signal of the signal produced due to the body kinematics of wearer in the signal that collects of microphone to subtrator.
Alternatively, heart rate detection unit, the cycle for the signal of being correlated with to heart rate is detected, and obtains heart rate by the inverse in the cycle of the signal detected.
Alternatively, acceleration transducer is arranged on the position not contacting wearer's skin in earphone.
From above-mentioned, this technical scheme in the embodiment of the present invention, have employed the airtight cavity that is made up of the cavity in earphone and ear casing to settle microphone, reduces the interference of outside noise, and enhances the signal message that microphone collects.In addition, the method also adds acceleration transducer to gather the signal produced by the body kinematics of wearer in earphone, adaptive-filtering is carried out to the signal of acceleration transducer collection, the acceleration transducer signals after adaptive-filtering is deducted from the signal of microphone collection, carry out heart rate detection again, thus eliminate the impact of body kinematics on heart rate detection of wearer, reach the object obtaining accurate heart rate.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation that can detect the earphone of heart rate in the embodiment of the present invention;
Fig. 2 A is the side schematic view of the earphone 100 being provided with cavity 110 in one embodiment of the invention;
As earphone 100 schematic rear view being provided with cavity 110 that 2B is in one embodiment of the invention;
Fig. 2 C is the side sectional view of the earphone 100 being provided with cavity 110 in one embodiment of the invention;
Fig. 3 is the schematic diagram of the riding position of acceleration transducer in one embodiment of the invention;
Fig. 4 is a kind of structural representation that can detect the earphone of heart rate in another embodiment of the present invention;
Fig. 5 is the general structure schematic diagram of sef-adapting filter;
Fig. 6 is a kind of flow chart being applied to the heart rate detection method of earphone in the embodiment of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Fig. 1 is a kind of structural representation that can detect the earphone of heart rate in the embodiment of the present invention.As shown in Figure 1, this earphone 100 that can detect heart rate comprises: subtrator 150, heart rate detection unit 160, acceleration transducer 130, adaptive-filtering unit 140, the microphone 120 being arranged on the cavity 110 in earphone and being arranged in cavity 110;
Wherein, the position that the mouth of cavity 110 and ear casing are fitted is, when earphone is worn and the auricle of the people's ear position of ear casing of fitting; There is perforate at the ear casing place that the mouth of cavity 110 is fitted, the cavity and form confined space with the auricle that perforate is fitted when earphone is worn.
Microphone 120, for when earphone 100 is worn, gathers changing the signal of generation by pressure and exporting to subtrator 150 in cavity 110.
Acceleration transducer 130, for when earphone is worn, gathers signal that the body kinematics due to wearer produces and exports to adaptive-filtering unit 140.
Adaptive-filtering unit 140, for carrying out adaptive-filtering process according to heart rate coherent signal to the signal that acceleration transducer 130 collects, after obtaining the estimated signal of the signal produced due to the body kinematics of wearer in the signal that microphone 120 collects, export to subtrator 150.
Subtrator 150, for deducting the estimated signal that adaptive-filtering unit 140 exports in the signal that collects from microphone, the signal obtaining heart rate relevant exports to heart rate detection unit 160 and adaptive-filtering unit 140.
Heart rate detection unit 160, carries out heart rate detection for the signal relevant according to heart rate.
In Fig. 1, adaptive-filtering process is carried out to the signal that acceleration transducer 130 detects, the human motion signal making the human motion signal that can collect from acceleration transducer 130 estimate microphone 120 exactly to collect, its objective is and eliminate because the body kinematics of people is on the impact of heart rate detection.Microphone 120 and acceleration transducer 130 all can detect the vibration signal that the body kinematics due to people produces, although two kinds of signal periods are consistent, but amplitude can be variant, therefore need to adopt filter to eliminate this species diversity, the acceleration signal made it possible to human motion produces is eliminated, to obtain effective heart rate information from the signal that microphone collects.
In the earphone 100 that can detect heart rate shown in Fig. 1, cavity 110 is set in earphone 100 to settle microphone 120, thus reduces the interference of outside noise, and enhance the signal message that microphone 120 collects.In addition, this can detect and add acceleration transducer 130 in the earphone 100 of heart rate and gather the signal produced by the body kinematics of wearer, adaptive-filtering is carried out to the signal that acceleration transducer 130 gathers, the acceleration transducer signals after adaptive-filtering is deducted from the signal of microphone collection, carry out heart rate detection again, thus eliminate the impact of body kinematics on heart rate detection of wearer.
In one embodiment of the invention, the earphone shown in Fig. 1 comprises low pass filter further, carries out low-pass filtering treatment, export to subtrator 150 again after obtaining low-pass filter signal for the signal collected microphone.I.e. subtrator 150, for deducting the estimated signal that adaptive-filtering unit 140 exports from low-pass filter signal, the signal obtaining heart rate relevant exports to heart rate detection unit.This is because the frequency of pulsatile motion lower (about 0.3Hz-3Hz), and outside noise frequency is higher, according to this feature, can be eliminated the impact of outside high-frequency noise by low pass filter.Such as, low pass filter can selective cut-off frequency be the FIR filter etc. of 5Hz.
In the technology of existing headset detection heart rate, usual microphone is directly placed in earphone just to the position of duct, for gathering the ear cavity pressure change information that eardrum produces, but the space on the one hand due to earphone and duct formation is larger, can cause the leakage of gas in duct, the pressure changing information that microphone is gathered is very faint, and earphone often can not occupy whole duct on the other hand, directly microphone is placed in earphone, the interference of outside noise can be subject to.Therefore the mounting means of another microphone is devised in earphone shown in Fig. 1 of the present invention, specifically can see Fig. 2 A-2C.
Fig. 2 A is the side schematic view of the earphone 100 being provided with cavity 110 in one embodiment of the invention.As earphone 100 schematic rear view being provided with cavity 110 that 2B is in one embodiment of the invention.Fig. 2 C is the side sectional view of the earphone 100 being provided with cavity 110 in one embodiment of the invention.In order to gather the useful signal relevant with heartbeat better, the present invention devises a kind of little cavity for placing microphone.See Fig. 2 A and Fig. 2 B, the scope in figure shown in dotted line is the signal of the position of internal cavity 110.See opening and the ear casing laminating of Fig. 2 C cavity 110.Can find out, in this embodiment, cavity 110 is positioned at the position that auricle is pressed close at earphone edge, there is individual perforate 111 at the position that earphone is fitted at itself and cavity, when earphone is worn, this perforate 111 and auricle fit tightly, and like this, cavity 110 and the auricle part be adjacent to form an airtight space.Microphone is arranged in this cavity 110, the contraction vibration of auricle wall can cause the change of cavity 110 internal pressure, so microphone will collect the change information of cavity 110 internal pressure, and this information reflects the jumping frequency rate of heart to a certain extent, therefore can carry out heart rate detection accordingly.
Fig. 3 is the schematic diagram of the riding position of acceleration transducer in one embodiment of the invention.Athletic meeting due to human body makes the skin of human body vibrate thereupon, in the present embodiment, acceleration sensor apparatus does not contact the position of skin in earphone, thus avoid the signal of skin vibrations to acceleration transducer collection to impact, improve the accuracy of acceleration transducer collection signal.See Fig. 3, acceleration transducer 130 can be placed on any one position of the earphone that the frame of dotted line shown in Fig. 3 illustrates.
In physics, for airtight space (not considering temperature), pressure and volume are inversely proportional to, and that is the less pressure of volume is larger, and the pressure so acted on certain area is also larger.After user brings earphone, the space that in duct, formation one is airtight, because the pulse pressure fluctuation of blood vessel causes ear wall to shrink, so can produce certain pressure change in cavity, this pressure change signal will be detected by microphone.In general the pulse pressure fluctuation of blood vessel is very faint, airtight space is larger, the pressure that so microphone detects changes less, in order to increase the pressure change intensity that microphone detects, by microphone apparatus in an airtight little cavity, this part is close to duct, and the pulse pressure fluctuation due to blood vessel causes ear wall to produce contraction vibration, and this vibration causes the microphone in little cavity the change of pressure to be detected.And the design of little cavity can reduce the impact of external interference signal to a certain extent.
Even if earphone can occupy whole duct, formed totally enclosed cavity, the body kinematics of people is also inevitable on the impact of heart rate detection.Because the body kinematics of people will inevitably cause the vibration of ear wall, and the pressure change in the cavity that this vibration produces can be detected by microphone equally.So, the data that microphone collects not only include the pressure changing information of the pulse pressure fluctuation generation due to blood vessel, the pressure changing information that the body kinematics simultaneously including people produces in duct.In order to eliminate the impact of body kinematics on heart rate detection of people, the present invention adds acceleration transducer in earphone, and acceleration sensor apparatus does not contact the position of skin in earphone, than the earphone position shown in dotted line frame as shown in Figure 3.Utilize the acceleration information that the body kinematics of acceleration transducer collection people produces.The change information of the duct internal pressure that the body kinematics of people produces and acceleration have identical vibration frequency, the interference that the body kinematics that certain filter can be adopted based on this to eliminate people produces.
According to analysis above, if can filtering produces due to the body kinematics of people from the signal that microphone detects signal, so just can obtain the signal because blood flow causes duct autogenous shrinkage to produce, this signal is relevant with heartbeat frequency, obtains heart rate information based on this signal.
Microphone collects the ear canal pressure change information caused by the body kinematics comprising people, the acceleration information that the body kinematics of what acceleration transducer collected is people is corresponding.Although two kinds of signals have the same vibration frequency, namely periodically identical, but amplitude can be different, can not directly be removed from the signal that microphone collects by this signal, therefore the present embodiment carrys out by the method for adaptive-filtering the interference that filtering produces due to the body kinematics of people.
In sum, in the embodiment of the present invention: first, adopt the airtight cavity of small volume to settle microphone, reduce outside noise interference, and enhance the signal message that microphone detects.Secondly, in earphone, add acceleration transducer, the signal that the body kinematics for gathering due to people produces, and eliminate the impact of body kinematics on heart rate detection of people by designing sef-adapting filter.Moreover, according to the feature of pulsatile motion frequency, devise low pass filter, further reduce the impact of outside noise.Be further detailed for Fig. 4 below.
Fig. 4 is a kind of structural representation that can detect the earphone of heart rate in another embodiment of the present invention.As shown in Figure 4, this earphone 400 that can detect heart rate comprises: subtrator 450, heart rate detection unit 460, low pass filter 470, acceleration transducer 430, adaptive-filtering unit 440, the microphone 420 being arranged on the cavity 410 in earphone and being arranged in cavity 410.Wherein, adaptive-filtering unit 440 comprises: Parameter adjustable filter 441 and parameter adaptive adjustment unit 442.
Wherein, the position that the mouth of cavity 410 and ear casing are fitted is, when earphone is worn and the auricle of the people's ear position of ear casing of fitting; There is perforate at the ear casing place that the mouth of cavity 410 is fitted, the cavity and form confined space with the auricle that perforate is fitted when earphone is worn.
Microphone 420, for when earphone 400 is worn, gathers changing produced signal by pressure and exporting to low pass filter 470 in cavity 410.
Low pass filter 470, carries out low-pass filtering treatment for the signal collected microphone 420, exports to subtrator 450 again after obtaining low-pass filter signal.
Acceleration transducer 430, for when earphone is worn, gathers signal the Parameter adjustable filter 441 exported in adaptive-filtering unit 440 and parameter adaptive adjustment unit 442 that the body kinematics due to wearer produces.
Parameter adaptive adjustment unit 442, signal, heart rate coherent signal and default adaptive algorithm for collecting according to acceleration transducer 430 remove the filtering parameter adjusting Parameter adjustable filter 441.
Parameter adjustable filter 441, for utilizing filtering parameter to carry out adaptive-filtering to the signal that acceleration transducer 430 gathers, export the estimated signal of the signal produced due to the body kinematics of wearer in the signal that Mike elegance 420 collects to subtrator 450.
Subtrator 450, for deducting the estimated signal that Parameter adjustable filter 441 exports in the signal that exports from low pass filter, the signal obtaining heart rate relevant exports to heart rate detection unit 460; Subtrator 450, also for heart rate coherent signal is exported to parameter adaptive adjustment unit 442.
Here the signal of parameter adaptive adjustment unit 442 according to acceleration transducer 430 collection of input and the heart rate coherent signal of subtrator 450 feedback, adopt adaptive algorithm to calculate the filtering parameter of Parameter adjustable filter 441.
Heart rate detection unit 460, carries out heart rate detection for the signal relevant according to heart rate.
In one embodiment of the invention, heart rate detection unit 460, the cycle for the signal of being correlated with to heart rate is detected, and obtains heart rate by the inverse in the cycle of the signal detected.Such as, heart rate detection unit 460, can utilize existing autocorrelation method, threshold method etc. to detect the cycle of the signal that heart rate is correlated with.
Fig. 5 is the general structure schematic diagram of sef-adapting filter.As shown in Figure 5, sef-adapting filter is formed primarily of parameter adaptive adjustment unit two parts of Parameter adjustable filter and adjustment filter coefficient.Sef-adapting filter does not need the knowledge of the statistical property knowing relevant signals in advance when designing, it can in the course of work of oneself gradually " understanding " or estimate required statistical property, and automatically adjust the parameter of oneself on this basis, to reach optimum filtering effect.In Fig. 5, Ex (n) is desired signal, and 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 controls by error signal, and e (n) is adjusted adaptation coefficient by predetermined adaptive algorithm, finally makes the mean square error of e (n) minimum, now outputs signal and approach desired signal most.
In the earphone shown in Fig. 4, have employed sef-adapting filter and filtering process is carried out to the signal that acceleration transducer collects, accurately to estimate the signal due to human motion generation that microphone collects.As shown in Figure 4, y1 (n) is the signal that acceleration transducer 430 collects, the input signal namely in corresponding adaptive-filtering unit 440, and y2 (n) is the output signal of adaptive-filtering unit 440, xL (n) represents corresponding desired signal
corresponding error signal (mainly comprising heart rate signal).YL (n) and y1 (n) have certain correlation, can by the suitable transfer function of design, make the output signal y2 (n) of y1 (n) after filtering after device approach yL (n).Such as can according to minimum mean square error criterion, when the desired value that error signal is all square is minimum, output signal y2 (n) can be used for effectively estimating yL (n), just human motion can be removed the interference of heart rate detection from the signal that microphone collects so, again remove the impact of interference signal.The signal of microphone after low-pass filtering deducts the signal of acceleration transducer after adaptive-filtering, obtains the signal message relevant with heart rate
carry out the detection of heart rate based on this.Beating of heart has certain periodicity, so
be the signal with some cycles, can obtain cycle corresponding to this signal according to autocorrelation method, the inverse in cycle is heart rate.
Detailed process is as follows:
Assuming that the signal that microphone detects is: x (n)=y (n)+d (n), the signal that acceleration transducer detects is y1 (n).
Wherein, y (n) represents the pressure change signal because the body kinematics of people produces, and d (n) represents the pressure change signal because blood flow produces; Y1 (n) represents the acceleration signal because the body kinematics of people produces, and n represents sampling time point.
X (n) signal after low-pass filtering becomes: xL (n)=yL (n)+dL (n).
Y1 (n) and y (n) is the signal that same motion produces, what y1 (n) was corresponding is acceleration information, what y (n) was corresponding is pressure information, although the amplitude of both correspondences is different, has identical vibration frequency.In order to y (n) is eliminated from x (n), sef-adapting filter (impulse response is h (n)) is selected to carry out filtering to y1 (n), obtain y2 (n)=y1 (n) * h (n), make y2 (n) as much as possible close to pressure change signal yL (n) that due to the body kinematics of people produce of x (n) after low-pass filtering.
Can be expressed as because duct shrinks the signal produced like this:
The auto-adaptive parameter of filter utilizes adaptive algorithm to obtain, and the method realizing adaptive algorithm is a lot, such as can adopt the method that mean square error is minimum, namely make
the filter coefficient obtained when getting minimum value.
Try to achieve
after, according to the periodic characteristics of this signal, autocorrelation method, threshold method etc. can be utilized to detect its cycle, the inverse in its cycle is exactly heart rate.
By Fig. 1 or embodiment illustrated in fig. 4 in earphone can to obtain people (quiet in various situation, motion etc.) under heart rate, to obtain the health information of people, or the amount of exercise of oneself can control in a suitable scope by people as the case may be on this basis.
Provide the heart rate detection method being applied to earphone in the present invention based on above-described embodiment, in the inventive method embodiment, the particular content of each step can see the associated description of product embodiments of the present invention.
Fig. 6 is a kind of flow chart being applied to the heart rate detection method of earphone in the embodiment of the present invention.As shown in Figure 6, the method comprises:
Step S610, arranges a cavity, is arranged on by microphone in cavity in earphone; The position that the mouth of cavity and ear casing are fitted is, when earphone is worn and the auricle of the people's ear position of ear casing of fitting; There is perforate at the ear casing place that the mouth of cavity is fitted, the cavity and form confined space with the auricle that perforate is fitted when earphone is worn; In earphone, also acceleration transducer is set.Such as, the position that do not contact wearer's skin of degree of will speed up sensor setting in earphone.
Step S620, when earphone is worn, is gathered by microphone and changes by pressure the signal produced in cavity, the signal produced due to the body kinematics of wearer by acceleration transducer collection;
Step S630, carries out adaptive-filtering process to the signal that acceleration transducer collects, and obtains the estimated signal of the signal produced due to the body kinematics of wearer in the signal that microphone collects.
Step S640, deducts this estimated signal from the signal that microphone collects, and obtains the signal that heart rate is relevant;
Step S650, the signal relevant according to heart rate carries out heart rate detection.
In one embodiment of the invention, method shown in Fig. 6 deducts estimated signal in the signal collected from microphone, the taking a step forward of signal obtaining heart rate relevant comprises: carry out low-pass filtering treatment to the signal that microphone collects, obtain low-pass filter signal.From the signal that microphone collects, deduct this estimated signal then in step S640, the signal obtaining heart rate relevant specifically comprises: from low-pass filter signal, deduct this estimated signal, obtains the signal that heart rate is relevant.
In one embodiment of the invention, carry out adaptive-filtering process in step S630 to the signal that acceleration transducer collects, the estimated signal obtaining the signal produced due to the body kinematics of wearer in the signal that microphone collects comprises:
Adaptive-filtering parameter is calculated according to signal, heart rate coherent signal and default adaptive algorithm that acceleration transducer collects;
The signal collected according to adaptive-filtering parameters on acceleration transducer carries out adaptive-filtering and obtains this estimated signal.
In one embodiment of the invention, relevant according to heart rate in step S650 signal carries out heart rate detection and comprises: detect the cycle of the signal that heart rate is correlated with, obtain heart rate by the inverse in the cycle of the signal detected.
The beneficial effect of technical solution of the present invention comprises in sum:
(1) airtight cavity that have employed small volume, to settle microphone, reduces outside noise interference, and enhances the signal message that microphone detects.
(2) in earphone, add acceleration transducer, the signal that the body kinematics for gathering due to people produces, and eliminate the impact of body kinematics on heart rate detection of people by design sef-adapting filter.
(3) according to the feature of pulsatile motion frequency, devise a kind of low pass filter, further reduce the impact of outside high-frequency noise.
The foregoing is only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.
Claims (10)
1. be applied to a heart rate detection method for earphone, it is characterized in that, described method comprises:
A cavity is set in earphone, microphone is arranged in described cavity; The position that the mouth of described cavity and ear casing are fitted is, when earphone is worn and the auricle of the people's ear position of ear casing of fitting; There is perforate at the ear casing place that the mouth of described cavity is fitted, the described cavity and form confined space with the auricle that described perforate is fitted when earphone is worn;
In earphone, also acceleration transducer is set;
When earphone is worn, gathered by described microphone and change by pressure the signal produced, the signal produced due to the body kinematics of wearer by described acceleration transducer collection in described cavity;
Adaptive-filtering process is carried out to the signal that described acceleration transducer collects, obtains the estimated signal of the signal produced due to the body kinematics of wearer in the signal that microphone collects;
From the signal that microphone collects, deduct described estimated signal, obtain the signal that heart rate is relevant;
The signal relevant according to described heart rate carries out heart rate detection.
2. the method for claim 1, is characterized in that,
In the signal collected from microphone, deduct described estimated signal, before obtaining the relevant signal of heart rate, the method comprises further: carry out low-pass filtering treatment to the signal that described microphone collects, obtain low-pass filter signal;
Describedly from the signal that microphone collects, deduct described estimated signal, the signal obtaining heart rate relevant specifically comprises: from described low-pass filter signal, deduct described estimated signal, obtains the signal that heart rate is relevant.
3. method as claimed in claim 1 or 2, it is characterized in that, describedly carry out adaptive-filtering process to the signal that described acceleration transducer collects, the estimated signal obtaining the signal produced due to the body kinematics of wearer in the signal that microphone collects comprises:
Adaptive-filtering parameter is calculated according to signal, heart rate coherent signal and default adaptive algorithm that acceleration transducer collects;
The signal collected according to described adaptive-filtering parameters on acceleration transducer carries out adaptive-filtering and obtains described estimated signal.
4. method as claimed in claim 1 or 2, is characterized in that, the described signal relevant according to described heart rate carries out heart rate detection and comprise:
The cycle of the signal that described heart rate is correlated with is detected;
Heart rate is obtained by the inverse in the cycle of the signal detected.
5. the method for claim 1, is characterized in that, the described acceleration transducer that also arranges in earphone comprises:
The position that do not contact wearer's skin of degree of will speed up sensor setting in earphone.
6. can detect an earphone for heart rate, it is characterized in that, this earphone comprises: subtrator, heart rate detection unit, acceleration transducer, adaptive-filtering unit, the microphone being arranged on the cavity in earphone and being arranged in described cavity;
Wherein, the position that the mouth of described cavity and ear casing are fitted is, when earphone is worn and the auricle of the people's ear position of ear casing of fitting; There is perforate at the ear casing place that the mouth of described cavity is fitted, the described cavity and form confined space with the auricle that described perforate is fitted when earphone is worn;
Described microphone, for when earphone is worn, gathers changing the signal of generation by pressure and exporting to subtrator in described cavity;
Described acceleration transducer, for when earphone is worn, gathers signal that the body kinematics due to wearer produces and exports to described adaptive-filtering unit;
Described adaptive-filtering unit, for carrying out adaptive-filtering process according to heart rate coherent signal to the signal that described acceleration transducer collects, after obtaining the estimated signal of the signal produced due to the body kinematics of wearer in the signal that microphone collects, export to described subtrator;
Described subtrator, deducts described estimated signal in the signal that collects from microphone, and the signal obtaining heart rate relevant exports to described heart rate detection unit and described adaptive-filtering unit;
Described heart rate detection unit, carries out heart rate detection for the signal relevant according to described heart rate.
7. earphone as claimed in claim 6, it is characterized in that, this earphone comprises further: low pass filter, carries out low-pass filtering treatment for the signal collected described microphone, obtains low-pass filter signal and exports to described subtrator;
Described subtrator, for deducting described estimated signal from described low-pass filter signal, the signal obtaining heart rate relevant exports to described heart rate detection unit.
8. earphone as claimed in claims 6 or 7, it is characterized in that, described adaptive-filtering unit comprises: Parameter adjustable filter and parameter adaptive adjustment unit;
Described acceleration transducer, for exporting to described Parameter adjustable filter and described parameter adaptive adjustment unit by the signal collected;
Described subtrator, for exporting to described parameter adaptive adjustment unit by described heart rate coherent signal;
Described parameter adaptive adjustment unit, signal, heart rate coherent signal and default adaptive algorithm for collecting according to acceleration transducer remove the filtering parameter adjusting described Parameter adjustable filter;
Described Parameter adjustable filter, for utilizing filtering parameter to carry out adaptive-filtering to the signal of acceleration transducer collection, exports the estimated signal of the signal produced due to the body kinematics of wearer in the signal that collects of microphone to described subtrator.
9. earphone as claimed in claims 6 or 7, is characterized in that,
Described heart rate detection unit, the cycle for the signal of being correlated with to described heart rate is detected, and obtains heart rate by the inverse in the cycle of the signal detected.
10. earphone as claimed in claim 6, is characterized in that,
Described acceleration transducer is arranged on the position not contacting wearer's skin in earphone.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410422936.3A CN104244127B (en) | 2014-08-25 | 2014-08-25 | A kind of heart rate detection method applied to earphone and the earphone that heart rate can be detected |
| US14/901,581 US9579029B2 (en) | 2014-07-24 | 2015-05-25 | Heart rate detection method used in earphone and earphone capable of detecting heart rate |
| KR1020157036700A KR101660671B1 (en) | 2014-07-24 | 2015-05-25 | Heart rate detection method used in earphone and earphone capable of detecting heart rate |
| DK15810778.9T DK3009070T3 (en) | 2014-07-24 | 2015-05-25 | METHOD OF DETECTING HEART RATE IN HEADPHONE AND HEADPHONE THAT CAN DETECT HEART RATE |
| PCT/CN2015/079680 WO2016011843A1 (en) | 2014-07-24 | 2015-05-25 | Heartrate detection method applicable in headphone and headphone capable of detecting heartrate |
| EP15810778.9A EP3009070B1 (en) | 2014-07-24 | 2015-05-25 | Heartrate detection method applicable in headphone and headphone capable of detecting heartrate |
| JP2015563115A JP6174169B2 (en) | 2014-07-24 | 2015-05-25 | Heart rate detection method applied to earphone and earphone capable of detecting heart rate |
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| CN201410422936.3A CN104244127B (en) | 2014-08-25 | 2014-08-25 | A kind of heart rate detection method applied to earphone and the earphone that heart rate can be detected |
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| CN104244127A true CN104244127A (en) | 2014-12-24 |
| CN104244127B CN104244127B (en) | 2017-12-19 |
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