CN106506004A - Bio electricity and the single channel harvester for raising level Quadrature square-wave frequency modulation multiple signals - Google Patents
Bio electricity and the single channel harvester for raising level Quadrature square-wave frequency modulation multiple signals Download PDFInfo
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/002—Provisions or arrangements for saving power, e.g. by allowing a sleep mode, using lower supply voltage for downstream stages, using multiple clock domains or by selectively turning on stages when needed
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
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- A—HUMAN NECESSITIES
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- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
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Abstract
The invention discloses a kind of bio electricity and the single channel harvester for raising level Quadrature square-wave frequency modulation multiple signals, microprocessor exports the quadrature square wave for raising predetermined level of different frequency, light-sensitive device is converted into current signal, and current signal is converted into default amplitude voltage signal；During light-sensitive device collection photosignal, noise level does not change, but as the quadrature square wave signal for driving due to having raised predetermined level, in the low level part of quadrature square wave signal, quadrature square wave signal improves substantially compared to noise, so as to improve in quadrature square wave signal low level section, light-sensitive device gets the signal to noise ratio of photosignal, and then improves the precision of the digital signal being input in microprocessor；Microprocessor is processed to digital signal, is isolated modulation orthogonal square-wave signal and low frequency bioelectrical signals, and is demodulated multichannel PPG signal from modulation orthogonal square-wave signal.
Description
Technical field
The present invention relates to Biomedical Signals Acquisition field, more particularly to a kind of bio electricity with raise level Quadrature square wave tune
The single channel harvester of multiple signals processed.
Background technology
The variable quantity of the carrying informations such as voltage signal, is represented in its relaxed state in an analogue form, but, in order to
It is easy to computer disposal, transmission and storage, generally digital signal will be transformed into by analog-digital converter, therefore in biological doctor
Learn in signal processing, analog digital conversion is requisite.
In existing multichannel Biomedical Signals Acquisition system, multi-disc ADC or multiway analog switch need to be generally adopted to arrange in pairs or groups
The scheme of monolithic ADC, the former have circuit complicated, the shortcoming that system power dissipation is high and circuit size is big；And the latter then can be in collection
During, due to the switching of variable connector, insertion switch noise, and as variable connector has setup time, phase can be caused
Interfere between adjacent channel signal.
In order to improve the acquisition quality of signal, notification number of the prior art is CN 104783778A, and the day for announcing is 2015
The patent application on July 22, in improves the quality of signals collecting by the use of quadrature square wave as pumping signal.
Inventor during the present invention is realized has found at least to suffer from the drawback that in above-mentioned prior art and not enough：
As existing harvester adopts analog-digital converter bar none, analog-digital converter is near input limits
When (maximum or minimum amplitude), presence is significantly non-linear, and the analog signal level of particularly input analog-to-digital converter is lower, obtains
The uncertainty of the digital conversion results for arriving is bigger.
Therefore, during using pure quadrature square wave as pumping signal, in the numeral that the low level part of quadrature square wave obtains
The signal to noise ratio of signal is just very low, so as to have impact on the acquisition precision of signal.
Content of the invention
For improve the deficiencies in the prior art, the invention provides a kind of bio electricity with raise level Quadrature square-wave frequency modulation multichannel
The single channel harvester of signal, the present invention realize analog digital conversion by single channel analog-digital converter to multichannel biomedicine signals, in detail
See below description：
A kind of bio electricity and the single channel harvester for raising level Quadrature square-wave frequency modulation multiple signals, the single channel collection dress
Put including：Microprocessor and at least 2 kinds light emitting diodes, the single channel harvester also include：Low frequency bioelectrical signals are detected
Circuit, adder operation circuit and single channel analog-digital converter,
The microprocessor exports the quadrature square wave for raising predetermined level of different frequency, raises the orthogonal side of predetermined level
Ripple drives at least 2 kinds light emitting diodes, and the light that light emitting diode sends is received by light-sensitive device after tested finger, described photosensitive
Device is converted into current signal, and current signal is converted into default amplitude voltage signal through current/voltage-converted amplifier；
During light-sensitive device collection photosignal, noise level does not change, but orthogonal as driven
, due to having raised predetermined level, in the low level part of quadrature square wave signal, quadrature square wave signal is compared to noise for square-wave signal
Improve substantially, so as to improve in quadrature square wave signal low level section, light-sensitive device gets the signal to noise ratio of photosignal, and then
Improve the precision of the digital signal being input in microprocessor；
The low frequency bioelectrical signals detection circuit obtains default amplitude bioelectrical signals, the default amplitude voltage signal
Mixed signal is obtained after being added through the adder operation circuit with the default amplitude bioelectrical signals, the mixed signal is by institute
State single channel analog-digital converter and be converted into digital signal；
The microprocessor is processed to digital signal, isolates modulation orthogonal square-wave signal with low frequency biology telecommunications
Number, and multichannel PPG signal is demodulated from modulation orthogonal square-wave signal.
Wherein, as the quadrature square wave signal for driving due to having raised predetermined level, in the high level of quadrature square wave signal
Part, improves the signal to noise ratio that light-sensitive device gets photosignal.
Wherein, the value of predetermined level is that more than half is optimal for the photosignal dynamic range of light-sensitive device collection.
Wherein, the low frequency bioelectrical signals are specially：Any one in ECG, EEG, EMG, EGG and EOG.
Wherein, the adder operation circuit includes：First resistor and second resistance, one end of the first resistor access the
One signal source, one end of the second resistance access secondary signal source, the other end of the first resistor and the second resistance
Another termination operational amplifier negative polarity input；One end of positive polarity input the 4th resistance of termination of operational amplifier,
The other end ground connection of the 4th resistance；The negative polarity input of the operational amplifier is also concurrently accessed the one of 3rd resistor
End, the outfan of another termination operational amplifier of the 3rd resistor, output signal voltage.
Another embodiment, the adder operation circuit include：First resistor and second resistance, one end of the first resistor
Access the first signal source, secondary signal source is accessed in one end of the second resistance, the other end of the first resistor and described the
The positive polarity input of another termination operational amplifier of two resistance；The negative polarity input of the operational amplifier connects the simultaneously
Three resistance and one end of the 4th resistance；The other end ground connection of the 4th resistance；Another termination computing of the 3rd resistor is put
The outfan of big device, output signal voltage.
Wherein, mixed signal is converted into digital signal by single channel analog-digital converter and sends into microprocessor；
Microprocessor carries out low-pass filtering treatment to digital signal and recovers low frequency bioelectrical signals；Microprocessor is to numeral
Signal carries out the bias light interference that separating treatment obtained in PPG signals and bioelectrical signals, and PPG signals and is eliminated；
The valley and peak value of PPG signal are calculated respectively；Again by corresponding to the valley and peak computational of PPG signals each wavelength
Absorbance difference Δ A, the spectral value being made up of absorbance difference Δ A can be obtained.
Wherein, the microprocessor carries out separating treatment and obtains PPG signals and bioelectrical signals, and PPG to digital signal
The step of bias light interference in signal is eliminated is specially：
In a cycle of the frequency for the quadrature square wave of 1f, respectively in each cycle of different frequency quadrature square wave
Sampled signal in positive and negative half period is added up, and positive half period accumulation result carries out asking poor with negative half-cycle accumulation result
Computing, to isolate the quadrature square wave signal of each road different frequency.
The beneficial effect of technical scheme that the present invention is provided is：The present invention is driven using the quadrature square wave for raising predetermined level
At least 2 kinds light emitting diodes, the light that light emitting diode sends are received by light-sensitive device after tested finger, so by electric current/
Voltage converting amplifiers are converted into default amplitude voltage signal；Microprocessor is to by default amplitude voltage signal and bioelectrical signals
The digital signal of composition is processed, and isolates the quadrature square wave signal of modulation and low frequency bioelectrical signals, and from modulation just
Hand in square-wave signal and demodulate multichannel PPG signal.Notification number in compared to background technology is 104783778A, and the day for announcing is
The patent application on July 22nd, 2015, invention significantly increases the photosignal in quadrature square wave signal low level section
Signal to noise ratio, improves default amplitude voltage signal；The precision of the digital signal that be input in microprocessor, micro- place are further improve
Reason device is demodulated separation and can obtain multichannel PPG signal to digital signal.The present invention improves and obtains in low level part
Signal to noise ratio, so that improve the precision of signals collecting；And when adder operation circuit is using the circuit of present invention design, can be with
The stable, mixed frequency signal of high precision, being easily integrated easily is got, and reduces circuit cost, expand the dynamic of signal
State scope, meets the multiple needs in practical application.
Description of the drawings
Fig. 1 is the structural representation of a kind of bio electricity and the single channel harvester for raising level Quadrature square-wave frequency modulation multiple signals
Figure；
Structural representations of the Fig. 2 for adder operation circuit；
Another structural representations of the Fig. 3 for adder operation circuit；
The schematic diagram of the quadrature square wave for raising predetermined level that Fig. 4 is provided for the present invention；
Fig. 5 is the flow chart of a kind of bio electricity and the single channel acquisition method for raising level Quadrature square-wave frequency modulation multiple signals.
In accompanying drawing, the list of parts representated by each label is as follows：
1：Microprocessor； 2：Light emitting diode；
3：Light-sensitive device； 4：Current/voltage-converted amplifier；
5：Low frequency bioelectrical signals detect circuit； 6：Adder operation circuit；
7：Single channel analog-digital converter.
Specific embodiment
For making the object, technical solutions and advantages of the present invention clearer, below embodiment of the present invention is made further
Ground is described in detail.
Embodiment 1
A kind of bio electricity and the single channel harvester for raising level Quadrature square-wave frequency modulation multiple signals, referring to Fig. 1, the single channel
Harvester includes：Microprocessor 1, at least 2 kinds light emitting diodes 2, light-sensitive device 3, current/voltage-converted amplifiers 4, low frequency
Bioelectrical signals detection circuit 5, adder operation circuit 6 and single channel analog-digital converter 7,
Microprocessor 1 exports the quadrature square wave for raising predetermined level of different frequency, raises the quadrature square wave of predetermined level
At least 2 kinds light emitting diodes 2, the light that light emitting diode 2 sends are driven to be received by light-sensitive device 3 after tested finger, photosensor
Part 3 is converted into current signal, and current signal is converted into default amplitude voltage signal through current/voltage-converted amplifier 4.
After the embodiment of the present invention raises predetermined level, during the collection photosignal of light-sensitive device 3, noise level does not have
Change, but as the quadrature square wave signal for driving due to having raised predetermined level, in the low level of quadrature square wave signal
Part, quadrature square wave signal improve substantially, so as to improve the optical telecommunications in quadrature square wave signal low level section compared to noise
Number signal to noise ratio；Notification number in compared to background technology is 104783778A, and the day for announcing is the patent Shen on July 22nd, 2015
Please using pure quadrature square wave as the patent application of pumping signal, the embodiment of the present invention is considerably improved in quadrature square wave signal
The signal to noise ratio of the photosignal of low level section, and then improve the quality that light-sensitive device 3 gets photosignal.
Further, since raising predetermined level, noise level is not changed in, in the high level part of quadrature square wave signal, just
Hand over square-wave signal also to have some improvement compared to noise, improve the letter of the photosignal in quadrature square wave signal high level section
Make an uproar ratio.
Further, the signal to noise ratio of the photosignal for being got due to light-sensitive device 3 is integrally strengthened, so improve be input to micro-
The precision of the digital signal in processor, microprocessor are demodulated separation and can obtain multichannel PPG signal to digital signal.
Wherein, the photosignal dynamic range of the value of predetermined level preferred light-sensitive device 3 collection more than half when, signal
During more than or equal to 1/2 dynamic range, the photosignal quality highest collected by light-sensitive device 3.
Low frequency bioelectrical signals detection circuit 5 obtains default amplitude bioelectrical signals, presets amplitude voltage signal and presets
Amplitude bioelectrical signals obtain mixed signal after the addition of adder operation circuit 6, and mixed signal is changed by single channel analog-digital converter 7
Into digital signal, microprocessor 1 is processed to digital signal, isolates modulation orthogonal square-wave signal with low frequency biology telecommunications
Number, and multichannel PPG signal is demodulated from modulation orthogonal square-wave signal.
Wherein, the quantity of light emitting diode 2 is more than or equal to 2.When implementing, the quantity of light emitting diode 2 is according to reality
Needs in application are set；The amplitude of default amplitude voltage signal and default amplitude bioelectrical signals is according in practical application
Needs set, when implementing, the embodiment of the present invention is without limitation.
Wherein, low frequency bioelectrical signals include：Any one in the bioelectrical signals such as ECG, EEG, EMG, EGG, EOG.
Microprocessor 1 can adopt any one in MCU, ARM, DSP or FPGA.Adder operation circuit 6 is using routine on the market
Addition device.
Wherein, bioelectrical signals detection circuit 5 gain and bandwidth by the bioelectrical signals for being detected amplitude and frequency
Scope determines.
In sum, due to the embodiment of the present invention relative to background technology in application documents, considerably improve just
The signal to noise ratio of the photosignal of square wave low level section is handed over, and also improves the photosignal in quadrature square wave signal high level section
Signal to noise ratio, and then the photosignal signal to noise ratio of whole level section is improve, improve the digital signal being input in microprocessor
Precision, microprocessor to digital signal be demodulated separation can obtain multichannel PPG signal.
Embodiment 2
A kind of bio electricity and the single channel harvester for raising level Quadrature square-wave frequency modulation multiple signals, referring to Fig. 1, the single channel
Harvester includes：Microprocessor 1, at least 2 kinds light emitting diodes 2, light-sensitive device 3, current/voltage-converted amplifiers 4, low frequency
Bioelectrical signals detection circuit 5, adder operation circuit 6 and single channel analog-digital converter 7.The embodiment is different from embodiment 1
Be, the adder operation circuit 6 that the adder operation circuit 6 is designed using the embodiment of the present invention realizing, referring to Fig. 2, addition fortune
Calculating circuit 6 includes：First resistor R1With second resistance R2,
First resistor R1One end access the first signal source V1, second resistance R2One end access secondary signal source V2, first
Resistance R1The other end and second resistance R2Another termination operational amplifier A negative polarity input；Operational amplifier A is just
Polarity input the 4th resistance R of termination4One end, the 4th resistance R4The other end ground connection；The negative polarity input of operational amplifier A
3rd resistor R is also concurrently accessed3One end, 3rd resistor R3Another termination operational amplifier A outfan, output signal electricity
Pressure Vo.
First signal source V1, secondary signal source V2Amplitude voltage signal and default amplitude bioelectrical signals are respectively preset；
Or, the first signal source V1, secondary signal source V2Amplitude bioelectrical signals and default amplitude voltage signal are respectively preset；Signal electricity
Pressure VoFor mixed signal.
In sum, due to the embodiment of the present invention relative to background technology in application documents, considerably improve just
The signal to noise ratio of the photosignal of square wave low level section is handed over, and also improves the photosignal in quadrature square wave signal high level section
Signal to noise ratio, and then the photosignal signal to noise ratio of whole level section is improve, improve the digital signal being input in microprocessor
Precision, microprocessor to digital signal be demodulated separation can obtain multichannel PPG signal.
Embodiment 3
A kind of bio electricity and the single channel harvester for raising level Quadrature square-wave frequency modulation multiple signals, referring to Fig. 1, the single channel
Harvester includes：Microprocessor 1, at least 2 kinds light emitting diodes 2, light-sensitive device 3, current/voltage-converted amplifiers 4, low frequency
Bioelectrical signals detection circuit 5, adder operation circuit 6 and single channel analog-digital converter 7.The embodiment is different from embodiment 1
It is that the adder operation circuit 6 can be realized using the adder operation circuit 6 of embodiment of the present invention design, referring to Fig. 3, should adds
Method computing circuit 6 includes：First resistor R1With second resistance R2,
First resistor R1One end access the first signal source V1, second resistance R2One end access secondary signal source V2, first
Resistance R1The other end and second resistance R2Another termination operational amplifier A positive polarity input；Operational amplifier A negative
Polarity input connects 3rd resistor R simultaneously3With the 4th resistance R4One end；4th resistance R4The other end ground connection；3rd resistor R3
Another termination operational amplifier A outfan, output signal voltage Vo.
First signal source V1, secondary signal source V2Amplitude voltage signal and default amplitude bioelectrical signals are respectively preset；
Or, the first signal source V1, secondary signal source V2Amplitude bioelectrical signals and default amplitude voltage signal are respectively preset；Signal electricity
Pressure VoFor mixed signal.
In sum, due to the embodiment of the present invention relative to background technology in application documents, considerably improve just
The signal to noise ratio of the photosignal of square wave low level section is handed over, and also improves the photosignal in quadrature square wave signal high level section
Signal to noise ratio, and then the photosignal signal to noise ratio of whole level section is improve, improve the digital signal being input in microprocessor
Precision, microprocessor to digital signal be demodulated separation can obtain multichannel PPG signal.
Embodiment 4
A kind of software flow of bio electricity and the single channel harvester for raising level Quadrature square-wave frequency modulation multiple signals, referring to
Fig. 4 and Fig. 5, the method are comprised the following steps：
101：Mixed signal is converted into digital signal by single channel analog-digital converter 7 and sends into microprocessor 1；
102：Microprocessor 1 carries out low-pass filtering treatment to digital signal and recovers low frequency bioelectrical signals；Microprocessor 1
Digital signal is carried out separating treatment obtain bias light in PPG signals and bioelectrical signals, and PPG signals etc. interference disappeared
Remove.
Wherein, the step is specially：
In a cycle of the frequency for the quadrature square wave of 1f, respectively in each cycle of different frequency quadrature square wave
Sampled signal in positive and negative half period is added up, and positive half period accumulation result carries out asking poor with negative half-cycle accumulation result
Computing, to isolate the quadrature square wave signal of each road different frequency.
Illustrate by taking the light emitting diode 2 of 4 kinds of wavelength as an example for the sake of concise explanation, it is assumed that λ 1, λ 2,4 wavelength of λ 3 and λ
The driving quadrature square wave frequency of light emitting diode be all 90 ° of 2f but phase, the light emitting diode 2 of 4 wavelength of λ 3 and λ drives
Quadrature square wave frequency is 90 ° of 1f but phase.
It is assumed that the sample frequency of single analog transducer 7 is fS, and fS=4Mf, it is assumed that with the highest frequency of drive signal
fmax(f in these casesmax=2f) 4M speeds photosignal is sampled, fs=8Mf, obtains sampled signal x
M (), wherein M are the positive integer more than or equal to 1；
It is assumed that sample frequency fSFar above modulation orthogonal square-wave signal and the change frequency of low frequency signal, letter is driven minimum
The a cycle of number frequency can be approximately considered the amplitude of each road quadrature square wave signal and the amplitude of low frequency signal is constant.Before most
As a example by 16M sampled data x (i)：
The optical signal of 2M times of wavelength X 1 is obtainedAnd completely eliminate low frequency signalImpact.
The optical signal of 2M times of wavelength X 2 is obtainedAnd completely eliminate low frequency signalImpact.
The optical signal of 2M times of wavelength X 3 is obtainedAnd completely eliminate low frequency signalImpact.
The optical signal of 2M times of wavelength X 4 is obtainedAnd completely eliminate low frequency signalImpact.
Wherein,WithRespectively the optical signal of wavelength X 1, λ 2, λ 3 and λ 4 and background are believed
Number amplitude, A for triangular wave drive signal amplitude.
103：The valley and peak value of PPG signal are calculated respectively；Again by each wavelength institute of the valley and peak computational of PPG signals
Corresponding absorbance difference Δ A, can obtain by Δ Aλ1、ΔAλ2……ΔAλnThe spectral value of composition.
Due to the pulsation phenomenon of tremulous pulse, it is in cyclically-varying to make blood flow in blood vessel, and blood is height opaque liquid,
Therefore the change of pulse beating necessarily causes the change of absorbance.
Consideration arteries fullness degree minimum state, the incident illumination from light source not by pulsatile arterial blood absorption, this
When output intensity ImaxMost strong, can be considered the incident illumination I of pulsatile arterial blood；And arteries fullness degree highest state is corresponding
The valley point of photoelectric sphyg ripple, i.e. pulsatile arterial blood effect maximum moment, output intensity I nowminMost weak, it is that pulsation is dynamic
The minimum output intensity I of arteries and veins blood.So, filled to maximum and arterial contraction to absorbance during minimum by recording tremulous pulse
Value, it is possible to which all have the human body component of constant absorption feature for the shadow of absorbance to eliminate skin histology, subcutaneous tissue etc.
Ring.
If incident intensity is I0, when detecting light intensity and arterial contraction when tremulous pulse is full, detection light intensity is respectively IminAnd Imax,
Absorbance difference during absorbance and arterial contraction when then tremulous pulse is full is：
Measure the valley I of each photoplethysmographicminAnd peak ImaxIt is obtained corresponding to photoplethysmographic
Absorbance difference Δ A, can obtain by Δ Aλ1、ΔAλ2……ΔAλnThe spectral value of composition.
That is, wavelength X 1, λ 2, the valley of the PPG signals of λ 3 and λ 4 and peak value are calculated respectively：Iminλ1、Imaxλ1、Iminλ2、
Imaxλ2、Iminλ3、Imaxλ3、Iminλ4And Imaxλ4.
To the model of each device in addition to specified otherwise is done, the model of other devices is not limited the embodiment of the present invention,
As long as the device of above-mentioned functions can be completed.
In sum, due to the embodiment of the present invention relative to background technology in application documents, considerably improve just
The signal to noise ratio of the photosignal of square wave low level section is handed over, and also improves the photosignal in quadrature square wave signal high level section
Signal to noise ratio, and then the photosignal signal to noise ratio of whole level section is improve, improve the digital signal being input in microprocessor
Precision, microprocessor to digital signal be demodulated separation can obtain multichannel PPG signal.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the embodiments of the present invention
Sequence number is for illustration only, does not represent the quality of embodiment.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvements that is made etc. should be included within the scope of the present invention.
Claims (8)
1. a kind of bio electricity and the quadrature square wave for raising level modulate the single channel harvester of multiple signals, single channel collection dress
Put including：Microprocessor and at least 2 kinds light emitting diodes, the single channel harvester also include：Low frequency bioelectrical signals are detected
Circuit, adder operation circuit and single channel analog-digital converter, it is characterised in that
The microprocessor exports the quadrature square wave for raising predetermined level of different frequency, and the quadrature square wave for raising predetermined level drives
At least 2 kinds light emitting diodes are moved, the light that light emitting diode sends is received by light-sensitive device after tested finger, the light-sensitive device
Current signal is converted into, current signal is converted into default amplitude voltage signal through current/voltage-converted amplifier；
During light-sensitive device collection photosignal, noise level does not change, but as the quadrature square wave for driving
Due to having raised predetermined level, in the low level part of quadrature square wave signal, quadrature square wave signal improves signal compared to noise
Substantially, so as to improve in quadrature square wave signal low level section, light-sensitive device gets the signal to noise ratio of photosignal, and then improves
The precision of the digital signal being input in microprocessor；
The low frequency bioelectrical signals detection circuit obtains default amplitude bioelectrical signals, the default amplitude voltage signal and institute
Stating default amplitude bioelectrical signals and mixed signal being obtained after adder operation circuit addition, the mixed signal is by the list
Road analog-digital converter is converted into digital signal；
The microprocessor is processed to digital signal, isolates modulation orthogonal square-wave signal and low frequency bioelectrical signals, and
Multichannel PPG signal is demodulated from modulation orthogonal square-wave signal.
2. a kind of bio electricity according to claim 1 gathers dress with the single channel for raising level Quadrature square-wave frequency modulation multiple signals
Put, it is characterised in that as the quadrature square wave signal for driving due to having raised predetermined level, in the high level of quadrature square wave signal
Part, improves the signal to noise ratio that light-sensitive device gets photosignal.
3. a kind of bio electricity according to claim 1 gathers dress with the single channel for raising level Quadrature square-wave frequency modulation multiple signals
Put, it is characterised in that the value of predetermined level is that more than half is optimal for the photosignal dynamic range of light-sensitive device collection.
4. a kind of bio electricity according to claim 1 gathers dress with the single channel for raising level Quadrature square-wave frequency modulation multiple signals
Put, it is characterised in that the low frequency bioelectrical signals are specially：Any one in ECG, EEG, EMG, EGG and EOG.
5. a kind of bio electricity according to claim 1 gathers dress with the single channel for raising level Quadrature square-wave frequency modulation multiple signals
Put, it is characterised in that the adder operation circuit includes：First resistor and second resistance,
The first signal source is accessed in one end of the first resistor, and secondary signal source is accessed in one end of the second resistance, and described the
The negative polarity input of another termination operational amplifier of the other end of one resistance and the second resistance；Operational amplifier is just
One end of polarity input the 4th resistance of termination, the other end ground connection of the 4th resistance；The negative polarity of the operational amplifier is defeated
Enter one end that end is also concurrently accessed 3rd resistor, the outfan of another termination operational amplifier of the 3rd resistor, output letter
Number voltage.
6. a kind of bio electricity according to claim 1 gathers dress with the single channel for raising level Quadrature square-wave frequency modulation multiple signals
Put, it is characterised in that the adder operation circuit includes：First resistor and second resistance,
The first signal source is accessed in one end of the first resistor, and secondary signal source is accessed in one end of the second resistance, and described the
The positive polarity input of another termination operational amplifier of the other end of one resistance and the second resistance；The operational amplifier
Negative polarity input simultaneously connect one end of 3rd resistor and the 4th resistance；The other end ground connection of the 4th resistance；Described
The outfan of another termination operational amplifier of three resistance, output signal voltage.
7. the quadrature square wave according to any claim in claim 1-6 modulates the single channel harvester of multiple signals,
Characterized in that, described device includes：
Mixed signal is converted into digital signal by single channel analog-digital converter and sends into microprocessor；
Microprocessor carries out low-pass filtering treatment to digital signal and recovers low frequency bioelectrical signals；Microprocessor is to digital signal
Carry out the bias light interference that separating treatment obtained in PPG signals and bioelectrical signals, and PPG signals to be eliminated；
The valley and peak value of PPG signal are calculated respectively；Again by the suction corresponding to the valley and peak computational of PPG signals each wavelength
Luminosity difference DELTA A, can obtain the spectral value being made up of absorbance difference Δ A.
8. quadrature square wave according to claim 7 modulates the single channel harvester of multiple signals, it is characterised in that described micro-
Processor carries out the bias light interference quilt that separating treatment is obtained in PPG signals and bioelectrical signals, and PPG signals to digital signal
The step of elimination, is specially：
In a cycle of the frequency for the quadrature square wave for raising predetermined level of 1f, respectively to the every of different frequency quadrature square wave
The sampled signal in positive and negative half period in the individual cycle is added up, and positive half period accumulation result is cumulative with negative half-cycle to be tied
Fruit carries out seeking difference operation, to isolate the quadrature square wave signal of each road different frequency.
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