CN105877729B - Biological signal measurement system, method and earphone - Google Patents
Biological signal measurement system, method and earphone Download PDFInfo
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- CN105877729B CN105877729B CN201410751316.4A CN201410751316A CN105877729B CN 105877729 B CN105877729 B CN 105877729B CN 201410751316 A CN201410751316 A CN 201410751316A CN 105877729 B CN105877729 B CN 105877729B
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Abstract
It includes several light sources that the present invention, which discloses a kind of bio signal measurement system, method and earphone, the system, is irradiated respectively into testee's skin surface, several optical sensors, is received respectively to several light sources of external reflectance and being converted into several signals in skin；One processor module receives several signals and calculates the related coefficient between each signal to be combined into single PPG signals.Bio signal measurement system, method and the earphone of the present invention is conducive to measure during the motion, overcomes the error caused by light is made an uproar, improves the accuracy of dynamic biological measuring signal.
Description
Technical field
The present invention relates to bio signals to measure field, more particularly to a kind of raising bio signal accuracy of measurement
System, method and earphone.
Background technology
A kind of existing bio signal monitoring earphone, to monitor heart rate degree of variation and cardiac rate, including an earphone, a light
Source and an optical sensor, earphone have the earplug of a light-transmitting materials, and earplug is placed in duct to form dark place, light source is then enabled
Earplug is penetrated, the skin back reflection in irradiation duct, then light source is incuded in the variation in a period of time to obtain by optical sensor
Body of light product variable signal (Photoplethysmography, PPG) is obtained, understands cardiac rate (Heart Rate) whereby.
When movement, user wears monitoring of pulse earphone and monitors the variation of cardiac rate, to maintain preferable exercise intensity,
The training for reaching more safe and effective rate whereby, such as jogs, in order to run or maintain certain exercise intensity for a long time,
It can determine to run speed using the cardiac rate that monitoring of pulse earphone provides.
But body certainly will will produce vibrations when movement, earphone, can be intermittent when in duct with physical shocks at this time
With ear canal wall generate gap, the gap will make the light source outside duct enter in duct generate light make an uproar, make optical sensor can not
The accurate light volume change measured in duct, generates error.
Therefore bio signal measurement system, method and earphone of the present invention are exactly that can overcome light to overcome the defect
Error caused by making an uproar improves the accuracy of dynamic biological measuring signal.
Invention content
The purpose of the present invention is monitor the deficiency of earphone for the existing bio signal to propose that a kind of raising dynamic is raw
Bio signal measurement system, method and the earphone of the accuracy of object measuring signal.
To reach the purpose, the present invention discloses a kind of bio signal measurement system, including several light sources, respectively to tested
Irradiation in person's skin surface；Several optical sensors are received respectively to several light sources of external reflectance and being converted into several in skin
Signal；One processor module receives several signals and calculates the related coefficient between each signal to be combined into single PPG signals；
The calculation formula of the related coefficient is：
RxyThe related coefficient for being one group for each two signal, wherein x and y are respectively the signal value of corresponding sensing signal；If
All coefficient RsxyWhen in a feasible value, all sensing signals, which are added, becomes a PPG signals, if it is not, with following equation
Calculate several signal x, y and coefficient RxyTo generate signal S obtained by each groupxy：
Sxy=(1-Rxy)(x+y)
Then by signal S obtained by each groupxyIt is added and generates PPG signals.
As a further improvement, wherein PPG signals are by carrying out rhythm of the heart estimation and detection after Fast Fourier Transform.
In one embodiment, wherein several optical sensors input the first sensing letter including the first optical sensor
Number S1, the second optical sensor to input the second sensing signal S2 and third optical sensor to input third sensing signal S3,
After noise canceled, coefficient R can be obtained by executing the related coefficient between each signal of operation two-by-two12、R23And R31, calculate
It after related coefficient, sets when related coefficient is in feasible value, PPG signals is calculated with following equation：
PPG signals=S1+S2+S3
If it is not, calculating several signals and related coefficient with following equation：
PPG signals=(1-R12)(S1+S2)+(1-R23)(S2+S3)+(1-R31)(S1+S3)
Then Fast Fourier Transform and rhythm of the heart estimation and detection are carried out after obtaining PPG signals.
Further, bio signal measurement system includes a gravity sensor, to generate a motor message after sense shock
And be sent to processor module, processor module handle PPG signals so that amplitude close to motor message amplitude, post-processing
PPG signals and motor message with generate one it is mobilisation after PPG signals.
Further, one simulation of setting between the wherein described processor module of bio signal measurement system and several optical sensors
Front end sensors.
Further, bio signal measurement system includes that a fast flash memory and a wireless communication module, fast flash memory are held
The rhythm of the heart information of row storage processor module institute operation, wireless communication module execute the ditch of processor module and other electronic equipments
It is logical.
A kind of bio signal measurement earphone, including an ear casing；One enters ear, is set to the side of ear casing；One can
The earplug of light transmission is set to the free end into ear；Several light sources are set into ear, and light is respectively at the diameter for entering ear
Earplug is passed through with different angle upwards；Several optical sensors are set into ear, receive several light sources respectively to generate several letters
Number；One processor module, is set to ear casing, receives several signals and calculates the related coefficient between each signal to be combined into list
One PPG signals；Wherein, the related coefficient between each signal is：
RxyThe related coefficient for being one group for each two signal, wherein x and y are respectively the signal value of corresponding sensing signal；If
All coefficient RsxyWhen in a feasible value, all sensing signals, which are added, becomes a PPG signals, if it is not, with following equation
Calculate several signal x, y and coefficient RxyTo generate signal S obtained by each groupxy：
Sxy=(1-Rxy)(x+y)
Then by signal S obtained by each groupxyIt is added and generates PPG signals.
And further, the optical sensor is set as three, is evenly distributed on ear surface, and along entering ear's diameter
To interval 120 degree.
A kind of bio signal method for measurement, including：
(1) several light sensing signals are obtained, and high-pass filtering, low-pass filtering, DC filtering are carried out respectively to several signals
And generalization；
(2) several signals are calculated separately to generate related coefficient with combination in pairs, formula is：
Wherein, RxyThe related coefficient for being one group for each two signal, wherein x and y are respectively the signal of corresponding sensing signal
Value；
(3) if all coefficient RsxyWhen in a feasible value, all sensing signals, which are added, becomes a PPG signals, if
It is no, several signal x, y and coefficient R are calculated with following equationxyTo generate signal S obtained by each groupxy：
Sxy=(1-Rxy)(x+y)
Then by signal S obtained by each groupxyIt is added and generates a PPG signals.
In conclusion compared with prior art, bio signal measurement system, method and earphone of the invention are conducive to moving
It measures in the process, overcomes the error caused by light is made an uproar, improve the accuracy of dynamic biological measuring signal.
Description of the drawings
Fig. 1 is the circuit block diagram of bio signal measurement system of the present invention.
Fig. 2 is the step flow chart of bio signal method for measurement of the present invention.
Fig. 3 is the original sensing signal schematic diagram of the present invention.
Fig. 4 is signal schematic representation of the original sensing signal of the present invention after high-pass filtering.
Fig. 5 is the signal schematic representation after sensing signal of the present invention after high-pass filtering is low-pass filtered again.
Fig. 6 is the sensing signal signal schematic representation after DC filtering again after the present invention is low-pass filtered.
Fig. 7 is the detailed step flow chart of bio signal method for measurement of the present invention.
Fig. 8 is the stereogram that bio signal of the present invention measures earphone.
Fig. 9 is the stereogram exploded view that bio signal of the present invention measures earphone.
It is each in figure that the reference numerals are as follows.
1 light source 10 of bio signal measurement system
11 processor module 12 of optical sensor
13 AFE(analog front end) sensor 14 of gravity sensor
15 wireless communication module 16 of fast flash memory
Bio signal measures 2 ear casing 21 of earphone
Enter 22 earplug 221 of ear
23 optical sensor 24 of light source
First the second sensing signals of sensing signal S1 S2
Third sensing signal S3.
Specific implementation mode
For technology contents, construction feature, institute's reached purpose and effect that the present invention will be described in detail, hereby illustrates and coordinate below
Attached drawing is explained in detail.
The present invention discloses a kind of bio signal measurement system, method and earphone, be according to the related coefficient of multigroup signal with
Single PPG signals are combined into, improve the accuracy that bio signal measures whereby.
Referring to Fig. 1, bio signal measurement system 1 includes several light sources 10, several optical sensors 11 and a processor die
Block 12.
Several light sources 10 irradiate different blocks respectively to be irradiated respectively to testee's skin surface, and light source is made to penetrate
From organization internal to external reflectance after skin, then inside is received by the different blocks of skin outward through several optical sensors 11 respectively
The light source of reflection is simultaneously converted into several signals, obtains the sensing signal of skin different blocks whereby, if processor module 12 receives
Dry signal simultaneously generates a rhythm of the heart value after handling several signals.
Fig. 2 is please referred to Fig. 6, specifically, because sensing position is different between several signals received, and sensing process
In light make an uproar influence, will produce the difference of light source reception, therefore, each position can be understood by comparing the related coefficient of each signal
Light is made an uproar the difference of influence.
Bio signal method for measurement of the present invention is as follows：When receiving each sensing signal, it will first carry out noise elimination, make an uproar
Sound elimination includes carrying out high-pass filtering to sensing signal, then carries out low-pass filtering to signal, then carry out DC filtering, later
Sampling frequency (Down Sampling) is reduced respectively, then by each sensing signal generalization (Normalize PPG
Amplitude) so that amplitude and energy size are close, the close signal of amplitude energy size via the judgement of related coefficient with
A PPG signals are combined into, and the PPG signals obtained are subjected to Fast Fourier Transform, signal is switched into frequency domain from time domain,
PPG signal parameters are acquired into heart rate value by rhythm of the heart estimation with detection again.
The judgement of related coefficient is as follows with the combined method of several signals：First, if being calculated with following formula of correlation coefficient
Dry signal：
Wherein, RxyThe related coefficient for being one group for each two signal, wherein x and y are respectively the signal of corresponding sensing signal
Value.
If all coefficient RsxyWhen in a feasible value, such as all coefficient RsxyWhen more than or equal to feasible value,
All sensing signals, which are added, becomes a PPG signals, if it is not, calculating several signal x, y and coefficient R with following equationxyWith
Generate signal S obtained by each groupxy：
Sxy=(1-Rxy)(x+y)
Then by full income signal SxyIt is added and obtains a PPG signals, wherein SxyAfter being combined for each two signal
Signal.
Referring again to Fig. 1, further, the bio signal measurement system 1 includes a gravity sensor 13, and sense shock is used
To obtain a motor message and be sent to processor module 12, and to execute the generalization of motor message and PPG signals
(normalize), it is the error that the rhythm of the heart can be caused to measure if differing too many with the energy of motor message because of PPG signals,
Therefore in order to keep energy close, execute with can be obtained after motor message generalization it is mobilisation after PPG signals, make PPG signals
It is close with the amplitude size of motor message, improve the accuracy of rhythm of the heart estimation and detection.
Further, an AFE(analog front end) sensor 14 is set between processor module 12 and several optical sensors 11, to connect
The signal detected is amplified, and is converted into digital signal from analog signal by the sensing signal for receiving several optical sensors 11.
Further, bio signal measurement system 1 includes a fast flash memory 15 and a wireless communication module 16, flash storage
Device 15 executes the rhythm of the heart information of storage 12 operations of processor module, and wireless communication module 16 executes processor module 12 and other
The communication of electronic equipment.
As a further improvement, several optical sensors 11 input the first sensing signal including the first optical sensor
S1, the second optical sensor pass through to input the second sensing signal S2 and third optical sensor to input third sensing signal S3
After noise is eliminated, the related coefficient of combination of two can obtain coefficient R between execution each signal of operation12、R23And R31, wherein
R12For related coefficient, the R of the first sensing signal S1 and the second sensing signal S223For the second sensing signal S2 and third sensing letter
Related coefficient, the R of number S331For the related coefficient of third sensing signal S3 and the first sensing signal S1, after calculating related coefficient,
Setting when related coefficient is in feasible value, such as all related coefficients be all higher than or equal to 0.4 when, calculated with following equation
PPG signals, i.e., being added several signals becomes PPG signals：
PPG signals=S1+S2+S3
If all related coefficients have one non-when being greater than or equal to 0.4, several signals and related coefficient are calculated with following equation：
PPG signals=(1-R12)(S1+S2)+(1-R23)(S2+S3)+(1-R31)(S1+S3)
Then Fast Fourier Transform and rhythm of the heart estimation and detection are carried out after obtaining PPG signals.
Referring to Fig. 7, a kind of detailed step flow chart of bio signal method for measurement, includes the following steps：
(1) several light sensing signals are obtained, and high-pass filtering, low-pass filtering, DC filtering are carried out respectively to several signals
And generalization；
(2) several signals are calculated separately to generate related coefficient with combination in pairs, formula is：
Wherein, RxyThe related coefficient for being one group for each two signal, wherein x and y are respectively the signal of corresponding sensing signal
Value；
(3) if all coefficient RsxyWhen in a feasible value, all sensing signals, which are added, becomes a PPG signals, if
It is no, several signal x, y and coefficient R are calculated with following equationxyTo generate signal S obtained by each groupxy：
Sxy=(1-Rxy)(x+y)
Then by signal S obtained by each groupxyIt is added and generates a PPG signals.
(4) it executes and PPG signals is subjected to Fast Fourier Transform to estimate that the rhythm of the heart acquires heart rate value.
Please refer to Fig. 8 and Fig. 9, a kind of bio signal measures earphone 2 comprising an ear casing 21, one enters ear 22, several
Light source 23, several optical sensors 24 and the earplug 221 for capableing of light transmission.Wherein, enter the side 21 that ear 22 is set to ear casing, quilt
It is arranged to that testee's duct can be stretched into, earplug 221 is set into 22 free end of ear.Several light sources 23 are set into ear
22, light passes through earplug 221 with different angle respectively.Several optical sensors 24 are set into ear 22, are received respectively pleasant
In portion 22 different skin position to several light sources 23 of external reflectance to generate several signals.Processor module 12 is set to earphone
Shell 21 carries out several signals high-pass filtering, low-pass filtering, DC filtering and generalization after receiving several signals and calculates respectively
Related coefficient between each signal is to be combined into single PPG signals, finally, by after PPG signal Fast Fourier Transform with estimation
The rhythm of the heart.
The earplug 221 of the bio signal measurement earphone 2 can be chosen to the silica gel material of light transmission.
And further illustrate, when bio signal, which measures earphone 2, to be shaken, make an uproar the journey of influence in order to compare light in duct
Degree, several optical sensors 24 are set as being evenly distributed on 22 surface of ear, such as optical sensor 24 is set as three, edge
120 degree of 22 spaced radial of Zhe Ru ears, when bio signal, which measures earphone 2, to be shaken upwards, the optical sensor 24 of position above is then
Closer ear channel skin, the light of reception are made an uproar then weaker, and two groups of positions are in the optical sensor 24 of lower section, because far from skin, reception
Light is made an uproar relatively strong；Conversely, when earphone shakes downwards, light that optical sensor 24 of the position in lower section receives is made an uproar then weaker, and position is above
The light that receives of optical sensor 24 make an uproar relatively strong, whereby, the related coefficients of three optical sensors 24 can react light extraction and make an uproar shadow
Loud degree.
Compared with prior art, bio signal measurement system, method and earphone of the invention are conducive to measure during the motion
It surveys, overcomes the error caused by light is made an uproar, improve the accuracy of dynamic biological measuring signal.
In conclusion the present invention meets patent of invention important document, whence proposes patent application in accordance with the law.But the foregoing is merely
The preferable embodiments possible of the present invention, therefore, it does not limit the scope of the claims of the present invention, therefore use description of the invention such as
And the equivalent structure variation carried out by accompanying drawing content, it is similarly all included within the scope of the present invention, Chen Ming is given in conjunction.
Claims (10)
1. a kind of bio signal measurement system, it is characterised in that：Including：Several light sources shine into testee's skin surface respectively
It penetrates；Several optical sensors are received respectively to several light sources of external reflectance and being converted into several signals in skin；One processor die
Block receives several signals and calculates the related coefficient between each signal to be combined into single PPG signals, the meter of the related coefficient
Calculating formula is：
RxyThe related coefficient for being one group for each two signal, wherein x and y are respectively the signal value of corresponding sensing signal；If all
Coefficient RxyWhen in a feasible value, all sensing signals, which are added, becomes a PPG signals, if it is not, being calculated with following equation
Several signal x, y and coefficient RxyTo generate signal S obtained by each groupxy：
Sxy=(1-Rxy)(x+y)
Then by signal S obtained by each groupxyIt is added and generates PPG signals.
2. bio signal measurement system according to claim 1, it is characterised in that：PPG signals become by fast Flourier
Rhythm of the heart estimation and detection are alternatively carried out afterwards.
3. bio signal measurement system according to claim 1, it is characterised in that：Several optical sensors include first
Optical sensor is inputting the first sensing signal S1, the second optical sensor inputting the second sensing signal S2 and third light sensing
Device is to input third sensing signal S3, and after noise canceled, executing the related coefficient between each signal of operation two-by-two can obtain
Coefficient R12、R23And R31, after calculating related coefficient, set when related coefficient is in feasible value, calculated with following equation
PPG signals：
PPG signals=S1+S2+S3
If it is not, calculating several signals and related coefficient with following equation：
PPG signals=(1-R12)(S1+S2)+(1-R23)(S2+S3)+(1-R31)(S1+S3)
Then Fast Fourier Transform and rhythm of the heart estimation and detection are carried out after obtaining PPG signals.
4. bio signal measurement system according to claim 1, it is characterised in that：Further comprise a gravity sensor,
To generate a motor message after sense shock and be sent to processor module, processor module handles PPG signals so that amplitude
Close to the amplitude of motor message, post-processing PPG signals and motor message with generate one it is mobilisation after PPG signals.
5. bio signal measurement system according to claim 1, it is characterised in that：The processor module is passed with several light
One AFE(analog front end) sensor is set between sensor.
6. bio signal measurement system according to claim 1, it is characterised in that：Further comprise a fast flash memory and
One wireless communication module, fast flash memory execute the rhythm of the heart information of storage processor module institute operation, and wireless communication module executes
The communication of processor module and other electronic equipments.
7. a kind of bio signal measures earphone, it is characterised in that：Including：One ear casing；One enters ear, is set to the one of ear casing
Side；One is capable of the earplug of light transmission, is set to the free end into ear；Several light sources are set into ear, and light is respectively at entering
Ear radially passes through earplug with different angle；Several optical sensors are set into ear, receive several light sources respectively to produce
Raw several signals；One processor module, is set to ear casing, receive several signals and calculate the related coefficient between each signal with
It is combined into single PPG signals；Wherein, the related coefficient between each signal is：
RxyThe related coefficient for being one group for each two signal, wherein x and y are respectively the signal value of corresponding sensing signal；If all
Coefficient RxyWhen in a feasible value, all sensing signals, which are added, becomes a PPG signals, if it is not, being calculated with following equation
Several signal x, y and coefficient RxyTo generate signal S obtained by each groupxy：
Sxy=(1-Rxy)(x+y)
Then by signal S obtained by each groupxyIt is added and generates PPG signals.
8. bio signal according to claim 7 measures earphone, it is characterised in that：Further comprise a gravity sensor,
A motor message is obtained to sense shock and is sent to processor module, and processor module handles PPG signals so that amplitude connects
The amplitude of nearly motor message, post-processing PPG signals and motor message with generate one it is mobilisation after PPG signals.
9. bio signal according to claim 7 measures earphone, it is characterised in that：The optical sensor is set as three,
It is evenly distributed on ear surface, along entering 120 degree of ear's spaced radial.
10. a kind of bio signal method for measurement, it is characterised in that：Including,
(1) several light sensing signals are obtained, and several signals are carried out with high-pass filtering, low-pass filtering, DC filtering and one respectively
As change；
(2) several signals are calculated separately to generate related coefficient with combination in pairs, formula is：
Wherein, RxyThe related coefficient for being one group for each two signal, wherein x and y are respectively the signal value of corresponding sensing signal；
(3) if all coefficient RsxyWhen in a feasible value, all sensing signals, which are added, becomes a PPG signals, if it is not, with
Following equation calculates several signal x, y and coefficient RxyTo generate signal S obtained by each groupxy：
Sxy=(1-Rxy)(x+y)
Then by signal S obtained by each groupxyIt is added and generates a PPG signals.
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| CN108024168A (en) * | 2016-10-28 | 2018-05-11 | 台湾实优特电子有限公司 | Biological information senses wired earphone |
| KR20210155165A (en) | 2020-06-15 | 2021-12-22 | 삼성전자주식회사 | Wearable device and method for measuring bio-signal |
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| US7544168B2 (en) * | 2004-09-30 | 2009-06-09 | Jerusalem College Of Technology | Measuring systolic blood pressure by photoplethysmography |
| KR100871565B1 (en) * | 2006-05-30 | 2008-12-02 | 삼성전자주식회사 | Ppg signal detecting apparatus of removed motion artifact and method thereof |
| CN103027690B (en) * | 2012-11-28 | 2014-08-27 | 华中科技大学 | Hypoperfusion oxyhemoglobin saturation measuring method based on self-correlation modeling method |
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