CN110664386A

CN110664386A - Acquisition device and method for pulse wave signals

Info

Publication number: CN110664386A
Application number: CN201910832142.7A
Authority: CN
Inventors: 王怡珊
Original assignee: Shenzhen Institute of Advanced Technology of CAS
Current assignee: Shenzhen Institute of Advanced Technology of CAS
Priority date: 2019-09-04
Filing date: 2019-09-04
Publication date: 2020-01-10
Anticipated expiration: 2039-09-04
Also published as: CN110664386B

Abstract

A pulse wave signal is generated based on a photoplethysmography technology, the pulse wave signal is periodically sampled by a driving module, the sampled pulse wave signals in two adjacent sampling periods are compared to judge whether the pulse wave signal is at a turning point or a rising stage, and a level signal is output according to a comparison result. When the level signal jumps, the pulse wave signal is at the turning point, and when the level signal is a high level signal, the pulse wave signal is at the rising stage, and the control module correspondingly controls the acquisition module to acquire at the turning point or the rising stage. According to the acquisition device and the acquisition method, the driving module monitors and feeds back the state of the pulse wave signal, and the main control module controls the acquisition module to work only when the pulse wave signal is at the turning point or at the rising stage, so that the part of the pulse wave signal reflecting the physiological characteristics of the organism is reserved, the acquired data volume is reduced, and the power consumption of data transmission and processing is reduced.

Description

Acquisition device and method for pulse wave signals

Technical Field

The invention belongs to the technical field of photoplethysmography, and particularly relates to a pulse wave signal acquisition device and method.

Background

At present, in order to reduce the power consumption of an LED (Light-Emitting Diode), a conventional PPG (Photoplethysmography) technology generally uses a PWM (Pulse Width Modulation) signal to control a driving circuit of the LED, and controls the LED to periodically turn on and off, so as to reduce the power consumption of the LED, or uses a compression sampling mode to collect information, so as to further reduce the duty ratio of the PWM signal and reduce the power consumption of the LED. However, in order to ensure that a sufficient amount of information is collected, the duty ratio of the PWM signal cannot be reduced without limit, so that the power consumption reduction capability of the LED driving circuit controlled by the PWM signal is limited, and after the signal is compressed and sampled, a complicated optimized information reconstruction process needs to be applied to recover the original information, and there is a delay in information sampling.

Therefore, the conventional PPG technical scheme has the problems that the duty ratio of the PWM signal cannot be reduced without limit, and the original information needs to be restored by applying a complex optimized information reconstruction process after the signal is compressed and sampled, so that power consumption is large and the real-time performance of information sampling is low.

Disclosure of Invention

In view of this, embodiments of the present invention provide an acquisition apparatus and method for a pulse wave signal, which aim to solve the problems that the duty ratio of a PWM signal cannot be reduced without limit, and a complicated optimized information reconstruction process needs to be applied to recover original information after compression sampling of the signal, resulting in large power consumption and low information sampling real-time performance in the conventional technical solution.

A first aspect of an embodiment of the present invention provides an acquisition apparatus for pulse wave signals, including:

the device comprises a photoelectric sensing module, a filtering module, a driving module, an acquisition module and a main control module;

the photoelectric sensing module is connected with the filtering module, the filtering module is connected with the driving module and the acquisition module, and the main control module is connected with the driving module and the acquisition module;

the photoelectric sensing module is used for collecting pulse wave signals of an organism and transmitting the pulse wave signals to the filtering module;

the filtering module is used for outputting the pulse wave signals to the driving module and/or the acquisition module after filtering;

the acquisition module is used for sampling the pulse wave signals when receiving the control signals, converting the pulse wave signals into digital signals and feeding the digital signals back to the main control module;

the driving module is used for periodically collecting the pulse wave signals, comparing the pulse wave signals sampled in two adjacent sampling periods to judge whether the pulse wave signals are at a turning point or at a rising stage, and outputting level signals according to the comparison result;

the main control module is used for outputting periodic signals to the driving module so as to control the driving module to work, receiving the level signals and outputting the control signals to the acquisition module when the level signals are judged to be high level signals or level jump occurs.

A second aspect of an embodiment of the present invention provides an acquisition method for a pulse wave signal, including:

after the pulse wave signals are filtered by a filtering module, the pulse wave signals are output to the driving module and/or the acquisition module;

sampling the pulse wave signals by adopting an acquisition module when a control signal is received, converting the pulse wave signals into digital signals and feeding the digital signals back to the main control module;

the driving module is adopted to periodically collect the pulse wave signals, and the pulse wave signals sampled in two adjacent sampling periods are compared to judge whether the pulse wave signals are at a turning point or at a rising stage, and a level signal is output according to a comparison result;

and outputting a periodic signal to the driving module by adopting a main control module so as to control the driving module to work, receiving the level signal and outputting a control signal to the acquisition module when the level signal is judged to be a high level signal or level jump occurs.

The device and the method for acquiring the pulse wave signals generate the pulse wave signals through the photoelectric sensing module based on the photoplethysmography technology, periodically sample the pulse wave signals through the driving module, compare the pulse wave signals acquired in two adjacent sampling periods to judge whether the pulse wave signals are at turning points or at a rising stage, and output level signals according to the comparison result. The main control module receives the level signal, when the level signal jumps, the pulse wave signal is at the turning point, and when the level signal is a high level signal, the pulse wave signal is at the rising stage, so that the control module correspondingly controls the acquisition module to perform sampling at the turning point or the rising stage. Because the physiological characteristic information of the organism is embodied in the peak value rising stage of the pulse wave signal, the state of the pulse wave signal is monitored and fed back through the driving module, and the main control module controls the acquisition module to work only when the pulse wave signal is at the turning point or the rising stage, so that the part of the pulse wave signal reflecting the physiological characteristic is reserved, the acquired data volume is reduced, and the transmission power consumption and the data processing power consumption are reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a module of an acquisition device for pulse wave signals according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a module of an acquisition device for pulse wave signals according to another embodiment of the present invention;

FIG. 3 is a schematic diagram of a unit structure of the collecting device shown in FIG. 1;

FIG. 4 is an exemplary circuit schematic of a drive module in the acquisition device shown in FIG. 3;

FIG. 5 is a timing diagram of the various switches in the driver module shown in FIG. 4;

FIG. 6 is a schematic diagram of pulse wave signals acquired based on photoplethysmography;

fig. 7 is a flowchart illustrating a method for acquiring a pulse wave signal according to another embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1 is a schematic structural diagram of a module of an acquisition device for pulse wave signals according to an embodiment of the present invention, which only shows parts related to the embodiment for convenience of description, and the details are as follows:

an acquisition device for pulse wave signals comprises a photoelectric sensing module 10, a filtering module 20, a driving module 30, an acquisition module 50 and a main control module 40.

The photoelectric sensing module 10 is connected to the filtering module 20, the filtering module 20 is connected to the driving module 30 and the collecting module 50, and the main control module 40 is connected to the driving module 30 and the collecting module 50.

The photoelectric sensing module 10 is used for collecting pulse wave signals of a living body and transmitting the pulse wave signals to the filtering module 20.

Specifically, the photo-sensing module 10 utilizes PPG technology to irradiate a light signal with a certain wavelength on the skin of a living body, and receives the light reflected by the skin of the living body and converts the light into an electrical signal, where the electrical signal is an initial pulse wave signal, and the pulse wave signal includes a series of physiological characteristic information of the living body, including blood oxygen saturation information and blood pressure value information.

Please refer to fig. 6, which is a schematic diagram of pulse wave signals acquired based on the photoplethysmography. The pulse wave signal includes several important features: the maximum peak value, the minimum peak value, the maximum slope and the dicrotic point are all in the ascending stage of the pulse wave signal, and the maximum peak value and the minimum peak value are also in the turning point of the pulse wave signal.

When the blood oxygen saturation level of the living body needs to be checked, the maximum peak value and the minimum peak value of the pulse wave signal can be converted to obtain the blood oxygen saturation level. When the blood pressure value of the organism needs to be checked, the maximum writing, the maximum peak value, the minimum peak value and the dicrotic point of the pulse wave signal are used for conversion to obtain the blood pressure value. Therefore, the characteristics included in the rising phase of the pulse wave signal reflect the physiological characteristics of the living body, and the signal in the falling phase is an unnecessary signal.

How to control the acquisition module 50 to only acquire the part reflecting the physiological characteristics of the living body in the pulse wave signal and eliminate unnecessary parts, thereby reducing the acquired data volume, efficiently acquiring the physiological characteristic information of the living body, and reducing the transmission power consumption and the data processing power consumption is the core of the technical scheme of the invention.

The filtering module 20 is configured to filter the pulse wave signal and output the filtered pulse wave signal to the driving module 30 and/or the collecting module 50.

Specifically, the driving module 30 receives the pulse wave signal outputted from the filtering module 20 in real time, and the collecting module 50 collects, processes and outputs the pulse wave signal only when receiving the control signal outputted from the main control module 40.

Optionally, the filtering module 20 is configured to filter out a dc signal in the pulse wave signal, and retain a part of the ac signal.

The light signal emitted by the photoelectric sensing module 10 is reflected back to the photoelectric sensing module 10 after passing through the skin tissue of the nerve object, and is converted into an initial pulse wave signal (electric signal), the light absorption efficiency of the muscle, the bone, the vein and other connecting tissues of the living body is basically unchanged, and the blood in the artery has remarkable fluidity, so that the light absorption has periodic change. The filtering module 20 filters the dc signals from the pulse wave signals, and only keeps the ac signals to the driving module 30 and/or the collecting module 50.

The acquisition module 50 is configured to sample the pulse wave signal when receiving the control signal, convert the pulse wave signal into a digital signal, and feed back the digital signal to the main control module 40.

Optionally, since the acquiring module 50 is configured to acquire the pulse wave signal at the ascending stage or at the turning point, the pulse wave signal acquired by the acquiring module 50 includes the maximum peak value information, the minimum peak value information, the maximum slope information, and the dicrotic point information.

Specifically, the acquisition module 50 performs signal acquisition only when the pulse wave signal is in the rising phase or at the turning point, and does not work otherwise, so that the data volume received by itself is reduced, and the power consumption caused by acquiring, transmitting and processing unnecessary parts in the pulse wave signal is completely eliminated.

The driving module 30 is configured to sample the pulse wave signals periodically, compare the pulse wave signals sampled in two adjacent sampling periods, determine whether the pulse wave signals are at a turning point or at a rising stage, and output a level signal according to a comparison result.

Specifically, the sampling period of the driving module 30 can be set according to actual conditions, and for example, three adjacent sampling periods 001, 002 and 003 are taken as examples, and it is assumed that the sampling period 001 is the earliest sampling period, 002 times, and 003 is the latest sampling period of the three sampling periods. The driving module 30 samples the primary pulse wave signal 00A in the sampling period 001, samples the primary pulse wave signal 00B in the sampling period 002, and compares the two sampled pulse wave signals.

If the value of 00A is greater than 00B, it indicates that the pulse wave signal is in a falling phase, and the level signal output by the driving module 30 is 0 or a low level signal of other forms; if the value of 00A is less than 00B, which indicates that the pulse wave signal is in the rising phase, the level signal output by the driving module 30 is 1 or other forms of high level signal.

Meanwhile, the driving module 30 samples the pulse wave signal 00C once in the sampling period 003, and compares the value of 00B with the value of 00C, if the value of 00B is greater than 00C, it indicates that the pulse wave signal is in a falling stage, and the level signal output by the driving module 30 is a low level signal; if the value of 00B is less than 00C, it indicates that the pulse wave signal is in the rising phase, and the level signal output by the driving module 30 is a high level signal.

If the two comparison results show that the one-time output level signal is a low level signal and the one-time output level signal is a high level signal, that is, a level jump occurs, it indicates that 00B is a turning point of the pulse wave signal and 00B is a maximum peak value or a minimum peak value.

The main control module 40 is configured to output a periodic signal to the driving module 30 to control the driving module 30 to work, receive a level signal, and output a control signal to the acquisition module 50 when it is determined that the level signal is a high level signal or a level jump occurs.

Specifically, when the level signal is a high level signal, it indicates that the pulse wave signal is in a rising phase; when the level signal jumps, the pulse wave signal is at the turning point, when the level signal jumps from a low level signal to a high level signal, the pulse wave signal at the moment is the minimum peak value, and when the level signal jumps from the high level signal to the low level signal, the pulse wave signal at the moment is the maximum peak value.

In practical application, according to different physiological characteristics to be checked, different programs can be written into the main control module 40, so that the main control module 40 outputs a control signal to the acquisition module 50 only when the level signal is judged to jump, and the blood oxygen saturation information of the organism is finally determined; or the main control module 40 outputs a control signal to the collecting module 50 when the level signal is judged to be a high level signal, so as to finally measure the blood pressure value information and/or the blood oxygen saturation information of the living body.

In an optional embodiment, the main control module 40 is further configured to calculate a blood sample saturation and/or a blood pressure value of the living being according to the pulse wave signal.

Fig. 2 is a schematic structural diagram of a module of an acquisition device for pulse wave signals according to another embodiment of the present invention, which only shows the relevant parts of the embodiment for convenience of description, and the details are as follows:

in an optional embodiment, the above-mentioned collecting device further includes a wireless communication module 60, and the wireless communication module 60 is connected to the main control module 40 and is configured to receive the pulse wave signal uploaded by the main control module 40. Optionally, the wireless communication module 60 is further configured to output the blood oxygen saturation level and/or the blood pressure value calculated by the main control module 40.

In an optional embodiment, the above-mentioned collecting device further comprises a display module, and the display module is connected to the wireless communication module 60 and is configured to display the pulse wave signal and display the value of the blood sample saturation and/or the blood pressure value.

In an optional embodiment, the above-mentioned collecting device further includes a human-computer interaction module, where the human-computer interaction module is used for an operator to select to measure the blood oxygen saturation information and/or the blood pressure value information of the living body.

In an optional embodiment, the above-mentioned acquisition apparatus further includes a power module, the power module is connected to the sampling period photoelectric sensing module 10, the sampling period filtering module 20, the sampling period acquisition module 50, the sampling period driving module 30, and the sampling period main control module 40, and the power module is configured to supply power to the photoelectric sensing module 10, the sampling period filtering module 20, the sampling period acquisition module 50, the sampling period driving module 30, and the sampling period main control module 40.

Fig. 3 is a schematic diagram of a unit structure of the collecting device shown in fig. 1, and for convenience of description, only the parts related to the present embodiment are shown, and detailed as follows:

in an alternative embodiment, the driving module 30 includes a first switch unit 303, a second switch unit 304, a first sampling unit 301, a second sampling unit 302, and a comparing unit 305.

The first switch unit 303 is connected to the filtering module, the first sampling unit 301, the second sampling unit 302 and the second switch unit 304, the second switch unit 302 is connected to the comparing unit 305, and the first switch unit 303, the second switch unit 304 and the comparing unit 305 are all connected to the main control module 40;

the first switch unit 303 is configured to be turned on according to the first period signal, so as to correspondingly control the first sampling unit 301 and the second sampling unit 302 to respectively collect and store the pulse wave signal in two adjacent sampling periods.

The second switch unit 304 is configured to be turned on according to the second periodic signal to control the first sampling unit 301 and the second sampling unit 302 to transmit the pulse wave signals collected by themselves to the comparing unit 305 respectively.

The comparing unit 305 is configured to compare the pulse wave signals acquired in two adjacent sampling periods, and output a level signal according to a comparison result.

Specifically, the first periodic signal and the second periodic signal are both periodic square wave signals.

In an optional embodiment, the aforementioned photoelectric sensing module 10 includes a light emitting unit 101, a photosensitive unit 102, and an amplifying unit 103.

The light emitting unit 101 is connected with the photosensitive unit 102, the photosensitive unit 102 is connected with the amplifying unit 103, and the amplifying unit 103 is connected with the filtering module 20.

The light emitting unit 101 is used to generate an initial light signal and irradiate the skin of a living body.

The light sensing unit 102 is used for receiving the light signal reflected by the skin of the living body and generating a pulse wave signal accordingly.

The amplifying unit 103 is configured to amplify the pulse wave signal and output the amplified pulse wave signal to the filtering module 20.

Specifically, the collection device provided by this embodiment may combine with the conventional manner of using a PWM signal to control and drive the light-emitting unit 101 to periodically turn on and off, thereby reducing the power consumption of the light-emitting unit 101, and further reducing the power consumption of the collection device.

Optionally, the light emitting unit 101 is implemented by at least one light emitting diode, and the light emitting diode is tightly attached to the skin of the living body and emits a light signal with a certain wavelength. Specifically, the light emitting diode emits green or red light.

Optionally, the photosensitive unit 102 is implemented by using a photodiode or an optical coupler, and after the photodiode or the optical coupler senses the optical signal reflected by the skin, an electrical signal is correspondingly sensed, and the electrical signal is a pulse wave signal.

Optionally, the amplifying unit 103 is implemented by using a transimpedance amplifier, and in other optional embodiments, the amplifying unit 103 may also be implemented by using an operational amplifier.

In an optional embodiment, the main control module 40 is implemented by a single chip or a central processing unit.

In an alternative embodiment, the above-mentioned acquisition module 50 is implemented by an analog-to-digital converter.

Fig. 4 is a schematic diagram of an exemplary circuit of the driving module 30 in the collecting apparatus shown in fig. 3, which only shows the parts related to the present embodiment for convenience of description, and the details are as follows:

in an alternative embodiment, the first switch unit 303 includes a first analog switch f1 and a second analog switch f2, the second switch unit 304 includes a third analog switch f11 and a fourth analog switch f12, the first collecting unit includes a capacitor C2, the second collecting unit includes a capacitor C1, and the comparing unit 305 includes a comparator U1.

The inverting input of the comparator U1 serves as the first input of the comparing unit 305, the non-inverting input of the comparator U1 serves as the second input of the comparing unit 305, and the output of the comparator U1 serves as the output of the comparing unit 305.

The third analog switch f11 and the fourth analog switch f12 are both double-gate switches.

A first terminal of the first analog switch f1 and a first terminal of the second analog switch f2 are connected to the filtering module 20,

the second terminal of the first analog switch f1, the first terminal of the capacitor C2, the first input terminal of the third analog switch f11 and the first input terminal of the fourth analog switch f12 are connected in common, and the second terminal of the capacitor C2 is grounded. A first output of the third analog switch f11 is connected to an inverting input of the comparator U1. A first output terminal of the fourth analog switch f12 is connected to the non-inverting input terminal of the comparator U1.

The second terminal of the second analog switch f2, the first terminal of the capacitor C1, the second input terminal of the fourth analog switch f12 and the second input terminal of the third analog switch f11 are connected in common, and the second terminal of the capacitor C1 is grounded. A second output terminal of the third analog switch f11 is connected to the non-inverting input terminal of the comparator U1. A second output of the fourth analog switch f12 is connected to the inverting input of the comparator U1.

The first, second, third and fourth analog switches f1, f2, f11 and f12 are turned on when receiving a high level signal and turned off when receiving a low level signal.

Please refer to fig. 5, which is a timing chart of each switch in the driving module 30 shown in fig. 4. The first periodic signal outputted from the main control module 40 is used to control the first analog switch f1 and the second analog switch f2 to operate. The output second periodic signal is used for controlling the third analog switch f11 and the fourth analog switch f12 to work.

The first periodic signal includes a first sub-periodic signal for controlling the first analog switch f1 and a second sub-periodic signal for inverting the first sub-periodic signal and outputting the inverted signal to control the second analog switch f2, that is, the first sub-periodic signal and the second sub-periodic signal are inverted signals. The second periodic signal includes a third sub-periodic signal that controls the third analog switch f11 and a fourth sub-periodic signal that controls the fourth analog switch f 12.

The first sub-period signal, the second sub-period signal, the third sub-period signal and the fourth sub-period signal are periodic square wave signals and comprise a high level state and a low level state.

The working principle of the drive module 30 is detailed below:

first, the first sub-period signal is in a high level state, the first analog switch f1 is turned on, and the capacitor C1 samples the pulse wave signal; then, the third sub-period signal is converted to a high state, the third analog switch f11 is turned on, the pulse wave signal sampled by the capacitor C1 is output to the non-inverting input terminal of the comparator U1, and the stored pulse wave signal sampled in the previous sampling period is output by the capacitor C2 to the inverting input terminal of the comparator U1. The comparator U1 compares the two pulse wave signals received and outputs a level signal accordingly.

Secondly, the first sub-period signal is converted into a low level state, the second sub-period signal is converted into a high level state, the second analog switch f2 is switched on, and the capacitor C2 samples the pulse wave signal; thereafter, the third sub-period signal is switched to a low state, the third analog switch f11 is turned off, the fourth sub-period signal is switched to a high state, and the fourth analog switch f12 is turned on. The pulse wave signal sampled by the capacitor C2 is output to the non-inverting input terminal of the comparator U1, and the stored pulse wave signal sampled in the previous sampling period is output by the capacitor C1 to the inverting input terminal of the comparator U1. The comparator U1 compares the two pulse wave signals received and outputs a level signal accordingly.

And thirdly, repeating the first point and the second point.

The driving module 30 realizes real-time monitoring of the state of the pulse wave signal by comparing the magnitude of the pulse wave signals in two adjacent sampling periods, and when the pulse wave signal is in a rising stage, the level signal output by the comparator U1 is a high level signal in 1 or other forms; when the pulse wave signal is at the maximum peak value or the minimum peak value, the output level signal jumps.

Fig. 7 is a flowchart illustrating steps of a pulse wave signal acquisition method according to still another embodiment of the present invention, which only shows parts related to this embodiment for convenience of description, and the following details are described below:

an acquisition method for pulse wave signals, comprising the steps of:

s01: the photoelectric sensing module is used for collecting pulse wave signals of the organism and transmitting the pulse wave signals to the filtering module;

s02: after the pulse wave signals are filtered by the filtering module, the pulse wave signals are output to the driving module and/or the acquisition module;

s03: sampling the pulse wave signals by adopting an acquisition module when the control signals are received, converting the pulse wave signals into digital signals and feeding the digital signals back to the main control module;

s04: the driving module is adopted to periodically collect pulse wave signals, and the pulse wave signals sampled in two adjacent sampling periods are compared to judge whether the pulse wave signals are at a turning point or at a rising stage, and level signals are output according to the comparison result;

s05: the main control module is adopted to output periodic signals to the driving module so as to control the driving module to work, receive level signals and output control signals to the acquisition module when the level signals are judged to be high level signals or level jump occurs.

Specifically, the photoelectric sensing module comprises a light emitting diode, a photosensitive diode and a trans-impedance amplifier, the filtering module filters direct current components in pulse wave signals, the driving module comprises a comparator and a capacitor used for sampling the pulse wave signals, the acquisition module is realized by adopting an analog-to-digital converter, and the main control module is realized by adopting a single chip microcomputer or a central processing unit.

Optionally, the detection method further includes:

and receiving the pulse wave signals uploaded by the main control module by adopting a wireless communication module.

Optionally, the detection method further includes:

and a power supply module is adopted to supply power to the photoelectric induction module, the filtering module, the acquisition module, the driving module and the main control module.

Optionally, the detection method further includes:

the human-computer interaction module is used for an operator to select and measure the blood oxygen saturation information and/or the blood pressure value information of the organism.

In summary, embodiments of the present invention provide an acquisition apparatus and method for pulse wave signals, which generate pulse wave signals through a photo-electric sensing module based on a photoplethysmography technique, periodically sample the pulse wave signals through a driving module, compare the pulse wave signals acquired in two adjacent sampling periods to determine whether the pulse wave signals are at a turning point or at a rising stage, and output a level signal according to a comparison result. The main control module receives the level signal, when the level signal jumps, the pulse wave signal is at the turning point, and when the high level signal is received, the pulse wave signal is at the rising stage, so that the control module correspondingly controls the acquisition module to perform sampling at the turning point or the rising stage. Because the physiological characteristic information of the organism is embodied in the peak value rising stage of the pulse wave signal, the state of the pulse wave signal is monitored and fed back through the driving module, and the main control module controls the acquisition module to work only when the pulse wave signal is at the turning point or the rising stage, so that the part of the pulse wave signal reflecting the physiological characteristic is reserved, the acquired data volume is reduced, and the transmission power consumption and the data processing power consumption are reduced.

Various embodiments are described herein for various circuits, apparatus, and methods. Numerous specific details are set forth in order to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the description. It will be appreciated by those of ordinary skill in the art that the embodiments herein and shown are non-limiting examples, and thus, it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An acquisition device for pulse wave signals, comprising:

2. The acquisition device as set forth in claim 1, wherein the drive module comprises:

the device comprises a first switch unit, a second switch unit, a first sampling unit, a second sampling unit and a comparison unit;

the first switch unit is connected with the filtering module, the first sampling unit, the second sampling unit and the second switch unit, the second switch unit is connected with the comparison unit, and the first switch unit, the second switch unit and the comparison unit are all connected with the main control module;

the periodic signal comprises a first periodic signal and a second periodic signal;

the first switch unit is used for conducting according to the first period signal so as to correspondingly control the first sampling unit and the second sampling unit to respectively collect and store pulse wave signals in two adjacent sampling periods;

the second switch unit is used for conducting according to the second periodic signal so as to control the first sampling unit and the second sampling unit to respectively transmit the pulse wave signals acquired by the first sampling unit and the second sampling unit to the comparison unit;

the comparison unit is used for comparing the pulse wave signals collected in two adjacent sampling periods and outputting the level signal according to a comparison result.

3. The acquisition device as set forth in claim 1, wherein the photoelectric sensing module comprises:

the device comprises a light-emitting unit, a photosensitive unit and an amplifying unit;

the light-emitting unit is connected with the photosensitive unit, the photosensitive unit is connected with the amplifying unit, and the amplifying unit is connected with the filtering module;

the light-emitting unit is used for generating an initial light signal and irradiating the skin of the organism;

the photosensitive unit is used for receiving the optical signal reflected by the skin of the organism and correspondingly generating the pulse wave signal;

the amplifying unit is used for amplifying the pulse wave signal and outputting the pulse wave signal to the filtering module.

4. The acquisition device according to claim 1, wherein the filter module is configured to filter out a dc signal in the pulse wave signal.

5. The acquisition device as set forth in claim 1, further comprising:

and the wireless communication module is connected with the main control module and is used for receiving the pulse wave signals uploaded by the main control module.

6. The acquisition device as set forth in claim 1, further comprising:

and the power supply module is connected with the photoelectric sensing module, the filtering module, the acquisition module, the driving module and the main control module and is used for supplying power to the photoelectric sensing module, the filtering module, the acquisition module, the driving module and the main control module.

7. The acquisition device of claim 1, wherein the master module is further configured to:

at least one of a blood oxygen saturation level and a blood pressure value of the living organism is calculated from the pulse wave signal.

8. The acquisition device according to claim 1, wherein the pulse wave signals acquired by the acquisition module include: maximum peak information and minimum peak information.

9. The acquisition device according to claim 8, wherein the pulse wave signals acquired by the acquisition module further include: maximum slope information and dicrotic point information.

10. An acquisition method for a pulse wave signal based on the acquisition device according to claim 1, comprising: