CN110664386A - A kind of acquisition device and method for pulse wave signal - Google Patents

Abstract

A device and method for collecting pulse wave signals, generating pulse wave signals based on photoplethysmography technology, periodically sampling the pulse wave signals by a driving module, and comparing the pulse wave signals sampled in two adjacent sampling periods, To judge whether the pulse wave signal is in the turning point or rising stage, and output the level signal according to the comparison result. When the level signal jumps, it means that the pulse wave signal is at a turning point. When the level signal is a high level signal, it means that the pulse wave signal is in the rising stage. The control module controls the acquisition module to collect at the turning point or the rising stage accordingly. The above-mentioned acquisition device and 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 the rising stage, which not only retains the pulse wave signal reflecting the biological body. For the part of physiological characteristics, the amount of collected data is reduced, and the power consumption of data transmission and processing is reduced.

Description

A kind of acquisition device and method for pulse wave signal

technical field

The invention belongs to the technical field of photoplethysmography, and in particular relates to a collection device and method for pulse wave signals.

Background technique

At present, in the traditional PPG (Photoplethysmography, photoplethysmography) technology, in order to reduce the power consumption of LED (Light-Emitting Diode, light-emitting diode), PWM (Pulse Width Modulation, pulse width modulation) signal is usually used to control the drive circuit of the LED, control The LEDs turn on and off periodically, thereby reducing the power consumption of the LEDs, or using compressed sampling to collect information, thereby further reducing the duty cycle of the PWM signal and reducing the power consumption of the LEDs. However, in order to ensure the collection of sufficient information, the duty cycle of the PWM signal cannot be reduced indefinitely. Therefore, the ability to reduce power consumption by using the PWM signal to control the LED driving circuit is limited, and the signal needs to be compressed and sampled. The optimized information reconstruction process restores the original information, and there is a delay in information sampling.

Therefore, in the traditional PPG technical solution, the duty cycle of the PWM signal cannot be reduced indefinitely, and after the signal is compressed and sampled, it is necessary to use a complex optimized information reconstruction process to restore the original information, resulting in high power consumption and real-time information sampling. low problem.

SUMMARY OF THE INVENTION

In view of this, the embodiments of the present invention provide a pulse wave signal acquisition device and method, aiming to solve the problem that the duty cycle of the PWM signal in the traditional technical solution cannot be reduced indefinitely, and the signal is compressed and sampled. The problem of high power consumption and low real-time information sampling caused by the need to use a complex optimization information reconstruction process to restore the original information.

A first aspect of the embodiments of the present invention provides a device for collecting pulse wave signals, including:

Photoelectric induction module, filter module, drive module, acquisition module and main control module;

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

The photoelectric sensing module is used to collect the pulse wave signal of the living body and transmit it to the filtering module;

The filtering module is configured to filter the pulse wave signal and output it to the driving module and/or the acquisition module;

The acquisition module is configured to sample the pulse wave signal when receiving the control signal, convert the pulse wave signal into a digital signal, and then feed it back to the main control module;

The driving module is used to periodically collect the pulse wave signal, and compare the pulse wave signals sampled in two adjacent sampling periods to determine whether the pulse wave signal is at a turning point or a rising stage, and according to the comparison Result output level signal;

The main control module is used to output a periodic signal to the drive module to control the drive module to work, and to receive the level signal, and to determine that the level signal is a high level signal or a level is generated When jumping, output the control signal to the acquisition module.

A second aspect of the embodiments of the present invention provides a method for collecting pulse wave signals, including:

Adopt the photoelectric sensing module to collect the pulse wave signal of the living body and transmit it to the filtering module;

After the pulse wave signal is filtered by a filtering module, the pulse wave signal is output to the driving module and/or the acquisition module;

Adopt the acquisition module to sample the pulse wave signal when receiving the control signal, convert the pulse wave signal into a digital signal, and then feed it back to the main control module;

The pulse wave signal is periodically collected by the driving module, and the pulse wave signals sampled in two adjacent sampling periods are compared to determine whether the pulse wave signal is at a turning point or in a rising stage, and output electrical power according to the comparison result. flat signal;

The main control module is used to output a periodic signal to the drive module to control the drive module to work, and to receive the level signal, and when it is judged that the level signal is a high-level signal or a level jump occurs , and output the control signal to the acquisition module.

The above-mentioned acquisition device and method for pulse wave signals generates pulse wave signals based on photoplethysmography technology through a photoelectric sensing module, and then periodically samples pulse wave signals through a driving module, and collects the pulse wave signals in two adjacent sampling periods. The received pulse wave signal is compared to determine whether the pulse wave signal is at a turning point or in a rising stage, and a level signal is output according to the comparison result. The main control module receives the level signal. When the level signal jumps, it means that the pulse wave signal is at a turning point. When the level signal is a high level signal, it means that the pulse wave signal is in the rising stage. Therefore, the control module correspondingly controls the acquisition module at the turning point. Sampling at the lower or rising stage. Since the physiological characteristic information of the organism is reflected in the peak rising stage of the pulse wave signal, the state of the pulse wave signal is monitored and fed back by the driving module, and the main control module controls the acquisition module only when the pulse wave signal is at the turning point or rising stage. When working, it not only retains the part of the pulse wave signal that reflects the physiological characteristics, but also reduces the amount of data collected, and reduces the power consumption of transmission and data processing.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only for the present invention. In some embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

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

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

Fig. 3 is the unit structure schematic diagram of the acquisition device shown in Fig. 1;

FIG. 4 is an example circuit schematic diagram of the driving module in the acquisition device shown in FIG. 3;

Fig. 5 is the timing comparison diagram of each switch in the drive module shown in Fig. 4;

6 is a schematic diagram of a pulse wave signal collected based on photoplethysmography;

FIG. 7 is a flowchart of steps of a method for collecting a pulse wave signal according to still another embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

1 is a schematic structural diagram of a module of an apparatus for collecting pulse wave signals according to an embodiment of the present invention. For the convenience of description, only the parts related to this embodiment are shown, and the details are as follows:

A collection device for pulse wave signal includes a photoelectric sensing module 10 , a filtering module 20 , a driving module 30 , a collection 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 acquisition module 50 , and the main control module 40 is connected to the driving module 30 and the acquisition module 50 .

The photoelectric sensing module 10 is used to collect the pulse wave signal of the living body and transmit it to the filtering module 20 .

Specifically, the photoelectric sensing module 10 uses PPG technology to irradiate a light signal of a certain wavelength on the skin of the living body, and receives the light reflected from the skin of the living body, and converts it into an electrical signal correspondingly, and the electrical signal is the initial The pulse wave signal contains a series of physiological characteristic information of the organism, including blood oxygen saturation information and blood pressure value information.

Please refer to FIG. 6 , which is a schematic diagram of a pulse wave signal collected based on the photoplethysmography technique. The pulse wave signal includes the following important features: the maximum peak value, the minimum peak value, the maximum slope and the repulsion point. The above features are all in the rising stage of the pulse wave signal, and the maximum peak value and the minimum peak value are still at the turning point of the pulse wave signal. .

When it is necessary to check the blood oxygen saturation of the living body, it can be obtained by converting the maximum peak value and the minimum peak value of the pulse wave signal. When it is necessary to check the blood pressure value of the living body, it can be obtained by converting the maximum value, maximum peak value, minimum peak value and ectopic point of the pulse wave signal. Therefore, the characteristics contained in the rising phase of the pulse wave signal reflect the physiological characteristics of the living body, while the signals in the falling phase are unnecessary signals.

However, how to control the acquisition module 50 to only collect the part of the pulse wave signal that reflects the physiological characteristics of the living body, excluding unnecessary parts, thereby reducing the amount of collected data, efficiently obtaining the physiological characteristics information of the living body, and reducing transmission power consumption and data Processing power consumption is the core of the technical solution of the present invention.

The filtering module 20 is used for filtering and processing the pulse wave signal, and then outputting it to the driving module 30 and/or the acquisition module 50 .

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

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

After the light signal emitted by the photoelectric sensing module 10 passes through the skin tissue of the object, it is reflected back to the photoelectric sensing module 10 and converted into an initial pulse wave signal (electrical signal). The absorption efficiency of light is basically unchanged, and the blood in the artery has significant fluidity, so there is a periodic change in the absorption of light. When the light signal reflected by the skin is converted into an electrical signal, the obtained pulse wave signal has a DC part. And the AC part, the signal of the DC part reflects the absorption of light by muscles, bones, veins and other connecting tissues, and the signal of the AC part reflects the absorption of light by the blood in the arteries. The filtering module 20 filters out the DC signal in the pulse wave signal, and only retains the AC signal to the driving module 30 and/or the acquisition 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 then feed it back to the main control module 40 .

Optionally, since the collection module 50 is used to collect the pulse wave signal in the rising phase or at the turning point, the pulse wave signal collected by the collection module 50 includes maximum peak information, minimum peak information, and also includes maximum slope information and repetition. Beat information.

Specifically, the acquisition module 50 only performs signal acquisition when the pulse wave signal is in the rising stage or at the turning point, otherwise it does not work, thus reducing the amount of data received by itself, and completely eliminating the need for unnecessary parts of the pulse wave signal. Power consumption for acquisition, transmission, and processing.

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

Specifically, the sampling period of the driving module 30 can be set according to the actual situation. Taking the adjacent three sampling periods 001, 002 and 003 as examples, it is assumed that the sampling period 001 is the earliest sampling period among the three sampling periods, and the sampling period is 002 times. After all, 003 is the latest. The driving module 30 samples the pulse wave signal 00A once in the sampling period 001, samples the pulse wave signal 00B once in the sampling period 002, and compares the two sampled pulse wave signals.

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

At the same time, 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 means that the pulse wave signal is in the falling stage, and the electrical output of the driving module 30 The flat signal is a low-level signal; if the value of 00B is less than 00C, it means that the pulse wave signal is in the rising stage, and the level signal output by the driving module 30 is a high-level signal.

If, in the results of the above two comparisons, one output level signal is a low level signal, and one output level signal is a high level signal, that is, a level jump occurs, then it means that 00B is the turning point of the pulse wave signal, and 00B is the turning point of the pulse wave signal. Maximum peak or minimum peak.

The main control module 40 is used for outputting 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 when it is judged that the level signal is a high level signal or a level jump occurs to the acquisition module 50.

Specifically, when the level signal is a high level signal, it indicates that the pulse wave signal is in the rising stage; when the level signal jumps, it indicates that the pulse wave signal is at a turning point, and when the signal jumps from a low level to a high level When the signal is flat, it means that the pulse wave signal at this time is the minimum peak value, and when the signal jumps from a high level signal to a low level signal, it means that the pulse wave signal at this time is the maximum peak value.

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

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

FIG. 2 is a schematic structural diagram of a module of a device for collecting pulse wave signals provided by another embodiment of the present invention. For convenience of description, only the parts related to this embodiment are shown, and the details are as follows:

In an optional embodiment, the above-mentioned collection device further includes a wireless communication module 60 . The wireless communication module 60 is connected to the main control module 40 for receiving 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 and/or blood pressure value calculated by the main control module 40 .

In an optional embodiment, the above-mentioned collection device further includes a display module, which is connected to the wireless communication module 60 for displaying the pulse wave signal, and displaying the blood sample saturation value and/or the blood pressure value.

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

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

FIG. 3 is a schematic diagram of the unit structure of the acquisition device shown in FIG. 1 . For the convenience of description, only the parts related to this embodiment are shown, and the details are as follows:

In an optional 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 comparison unit 305 .

The first switch unit 303 is connected to the filter 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 comparison unit 305, the first switch unit 303, the second switch unit 304 Both the element and the comparison unit 305 are 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 control the first sampling unit 301 and the second sampling unit 302 to collect and store the pulse wave signal in two adjacent sampling periods respectively.

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

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

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

In an optional embodiment, the above-mentioned 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 to the photosensitive unit 102 , the photosensitive unit 102 is connected to the amplifying unit 103 , and the amplifying unit 103 is connected to the filtering module 20 .

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

The photosensitive unit 102 is used to receive the light signal reflected by the skin of the living body, and generate a pulse wave signal accordingly.

The amplifying unit 103 is used for amplifying the pulse wave signal and outputting it to the filtering module 20 .

Specifically, the collection device provided in this embodiment can be combined with the traditional way of using PWM signal to control and drive the light-emitting unit 101 to turn on and off periodically, 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 close to the skin of the living body and emits light signals of a certain wavelength. Specifically, light emitting diodes emit green or red light.

Optionally, the photosensitive unit 102 is implemented by a photosensitive diode or an optical coupler. After the photosensitive diode or the optical coupler senses the light signal reflected by the skin, an electrical signal is correspondingly induced, and the electrical signal is a pulse wave signal.

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

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

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

FIG. 4 is an example circuit schematic diagram of the driving module 30 in the acquisition device shown in FIG. 3 . For convenience of description, only the parts related to this embodiment are shown, and the details are as follows:

In an optional embodiment, the above-mentioned 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, and the first acquisition unit It includes a capacitor C2, the second acquisition unit includes a capacitor C1, and the comparison unit 305 includes a comparator U1.

The inverting input terminal of the comparator U1 is used as the first input terminal of the comparison unit 305 , the non-inverting input terminal of the comparator U1 is used as the second input terminal of the comparison unit 305 , and the output terminal of the comparator U1 is used as the output terminal of the comparison unit 305 .

Both the third analog switch f11 and the fourth analog switch f12 are double gate switches.

The first end of the first analog switch f1 and the first end 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. The first output terminal of the third analog switch f11 is connected to the inverting input terminal of the comparator U1. The 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. The second output terminal of the third analog switch f11 is connected to the non-inverting input terminal of the comparator U1. The second output terminal of the fourth analog switch f12 is connected to the inverting input terminal of the comparator U1.

The first analog switch f1, the second analog switch f2, the third analog switch f11, and the fourth analog switch 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 comparison diagram of each switch in the driving module 30 shown in FIG. 4 . The first periodic signal output by the main control module 40 is used to control the first analog switch f1 and the second analog switch f2 to work. The outputted second period signal is used to control the third analog switch f11 and the fourth analog switch f12 to work.

Wherein, the first period signal includes the first subperiod signal for controlling the first analog switch f1 and the second subperiod signal for inverting the first subperiod signal and outputting to control the second analog switch f2, that is to say, The first sub-period signal and the second sub-period signal are mutually inverse signals. The second period signal includes a third subperiod signal for controlling the third analog switch f11 and a fourth subperiod signal for controlling the fourth analog switch f12.

The first sub-period signal, the second sub-period signal, the third sub-period signal and the fourth sub-period signal are all periodic square wave signals, and all include two states of high level and low level.

The working principle of the drive module 30 is described in detail below:

1. The first sub-cycle 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-cycle signal is converted into a high-level state, and 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 capacitor C2 outputs the stored pulse wave signal sampled in the previous sampling period to the inverting input terminal of the comparator U1. The comparator U1 compares the two received pulse wave signals and outputs a level signal accordingly.

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

3. Repeat the first and second points.

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

FIG. 7 is a flowchart of steps of a method for collecting pulse wave signals provided by still another embodiment of the present invention. For convenience of description, only the parts related to this embodiment are shown, and the details are as follows:

A method for collecting pulse wave signals, comprising the following steps:

S01: adopt the photoelectric induction module to collect the pulse wave signal of the living body and transmit it to the filter module;

S02: the pulse wave signal is filtered and processed by the filtering module, and then output to the driving module and/or the acquisition module;

S03: adopt the acquisition module to sample the pulse wave signal when receiving the control signal, convert the pulse wave signal into a digital signal, and then feed it back to the main control module;

S04: Use the drive module to periodically collect the pulse wave signal, and compare the pulse wave signals sampled in two adjacent sampling periods to determine whether the pulse wave signal is at a turning point or a rising stage, and output a level signal according to the comparison result ;

S05: Use the main control module to output the periodic signal to the drive module to control the drive module to work and receive the level signal, and when it is judged that the level signal is a high level signal or a level jump occurs, output the control signal to the acquisition module.

Specifically, the photoelectric sensing module includes a light-emitting diode, a photosensitive diode and a transimpedance amplifier, the filtering module filters out the DC component in the pulse wave signal, the driving module includes a comparator and a capacitor for sampling the pulse wave signal, and the acquisition module adopts analog-to-digital conversion. The main control module is realized by a single chip or a central processing unit.

Optionally, the above-mentioned detection method also includes:

A wireless communication module is used to receive the pulse wave signal uploaded by the main control module.

Optionally, the above-mentioned detection method also includes:

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

Optionally, the above-mentioned detection method also includes:

The human-computer interaction module is used for the operator to choose to measure the blood oxygen saturation information and/or blood pressure value information of the living body.

To sum up, the embodiments of the present invention provide a device and method for collecting pulse wave signals. The photoelectric sensing module generates pulse wave signals based on photoplethysmography technology, and then periodically samples the pulse wave signals through the driving module. Compare the pulse wave signals collected in two adjacent sampling periods to determine whether the pulse wave signal is at a turning point or in a rising stage, and output a level signal according to the comparison result. The main control module receives the level signal. When the level signal jumps, it means that the pulse wave signal is at a turning point. When it receives a high level signal, it means that the pulse wave signal is in the rising stage. Therefore, the control module controls the acquisition module correspondingly at the turning point or at the turning point. Sampling during the rising phase. Since the physiological characteristic information of the organism is reflected in the peak rising stage of the pulse wave signal, the state of the pulse wave signal is monitored and fed back by the driving module, and the main control module controls the acquisition module only when the pulse wave signal is at the turning point or rising stage. When working, it not only retains the part of the pulse wave signal that reflects the physiological characteristics, but also reduces the amount of data collected, and reduces the power consumption of transmission and data processing.

Various embodiments are described herein for various circuits, apparatus, and methods. Numerous specific details are set forth to provide a thorough understanding of the general structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. It will be understood by those skilled in the art, however, that 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 implementations in the specification. It will be understood by those skilled in the art that the embodiments herein and shown are non-limiting examples, and therefore, it may be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the embodiments range.

In the foregoing embodiments, the description of each embodiment has its own emphasis. For parts that are not described or described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of the present invention.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. Inside.

Claims (10)

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

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.

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:

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

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.

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