CN108420411B - Signal processing method and electronic equipment - Google Patents
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Abstract
The invention relates to the technical field of health, in particular to a signal processing method and electronic equipment. The electronic equipment is provided with a PPG sensor, a humidity sensor, a temperature sensor and a processor, and the PPG sensor, the humidity sensor and the temperature sensor are all connected with the processor. The processor is used for receiving a PPG signal acquired by a PPG sensor and adjusting the PPG signal, the PPG signal comprises a DC signal, and in addition, the processor is also used for respectively receiving temperature data of a user and humidity data of the user, which are sent by a temperature sensor, and adjusting parameters of the PPG sensor according to the temperature data, the humidity data and the DC signal so as to adjust the PPG signal, and improve the quality of the PPG signal. In the scheme, the PPG signal is adjusted through the acquired temperature data and humidity data so as to further improve the quality of the PPG signal.
Description
Technical Field
The invention relates to the technical field of medicine, in particular to a signal processing method and electronic equipment.
Background
Photoplethysmography (PPG) is a method for obtaining a trace of the absorption change of light in specific human tissues by optical techniques. The principle of the work of the PPG module for measuring physiological signals is that a light emitting diode irradiates light on the surface layer of the detected skin, a light receiving diode detects how much light is reflected, and then the data waveform of blood flow change caused by pressure pulse is obtained through reshaping amplification processing. The change of the data waveform is obtained by that the heart of the human body delivers blood to each tissue of the human body in each cardiac cycle, and the artery and the blood vessel of the arteriole of the subcutaneous tissue of the detection part are obtained by that the blood pumping of the heart causes the perfusion of the blood to generate periodic expansion and contraction change. When the blood perfusion is increased and the blood vessel is dilated, more green light is absorbed, the photoelectric signal received by the receiving photodiode is weakened, and conversely, the photoelectric signal is strengthened. Further, the cardiovascular characteristics of the user are obtained by analyzing the waveform variations.
In the prior art, a data waveform is acquired by a photoelectric detection method, and then cardiovascular characteristics of a user are analyzed according to the acquired waveform. The device for performing photoelectric detection is susceptible to various factors, so that the measured PPG signal is not accurate, and the cardiovascular characteristics of the user cannot be accurately analyzed. Therefore, it is necessary to provide a method for improving the quality of PPG signals.
Disclosure of Invention
The invention aims to provide a signal processing method for acquiring a PPG signal with higher accuracy.
It is another object of the invention to provide an electronic device to enable acquiring PPG signals with a higher accuracy.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, an embodiment of the present invention provides a signal processing method, which is applied to an electronic device, where the electronic device is provided with a PPG sensor, a temperature sensor, and a humidity sensor, and the method includes: acquiring, by the PPG sensor, a PPG signal, the PPG signal comprising a DC signal; receiving temperature data of a user sent by the temperature sensor; receiving humidity data of a user sent by the humidity sensor;
adjusting a parameter of the PPG sensor according to the temperature data, humidity data, and DC signal to adjust a PPG signal.
In a second aspect, an embodiment of the present invention further provides an electronic device, where the electronic device is provided with a PPG sensor, a humidity sensor, a temperature sensor, and a processor, the PPG sensor, the humidity sensor, and the temperature sensor are all connected to the processor, and the processor is configured to receive a PPG signal acquired by the PPG sensor, where the PPG signal includes a DC signal; the processor is also used for receiving the temperature data of the user sent by the temperature sensor and the humidity data of the user sent by the humidity sensor; the processor is further configured to adjust a parameter of the PPG sensor based on the temperature data, humidity data, and DC signal to adjust a PPG signal.
The embodiment of the invention provides a signal processing method and electronic equipment. The electronic equipment is provided with a PPG sensor, a humidity sensor, a temperature sensor and a processor, and the PPG sensor, the humidity sensor and the temperature sensor are all connected with the processor. The processor is used for receiving a PPG signal acquired by a PPG sensor, wherein the PPG signal comprises a DC signal, and is also used for respectively receiving temperature data of a user and humidity data of the user, which are sent by a temperature sensor, and adjusting parameters of the PPG sensor according to the temperature data, the humidity data and the DC signal to adjust the PPG signal, so that the quality of the PPG signal is improved. In the scheme, the PPG signal is adjusted through the acquired temperature data and humidity data, so that the accuracy of the PPG is further improved.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Fig. 2 shows a waveform diagram of a PPG signal provided by an embodiment of the present invention.
Fig. 3 shows another waveform diagram of a PPG signal provided by an embodiment of the present invention.
Fig. 4 is a schematic flow chart illustrating a signal processing method according to an embodiment of the present invention.
Fig. 5 is a flow chart illustrating sub-steps of a signal processing method according to an embodiment of the present invention.
The figure is as follows: 10-an electronic device; 11-a temperature sensor; 12-a humidity sensor; 13-a pressure sensor; 14-a distance sensor; 15-a light emitting diode; 16-receiving photodiode.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
The device that carries out PPG signal acquisition among the prior art is the PPG module, this PPG module includes emitting diode and receiving photodiode, this emitting diode sends light to user's skin surface, light is received by receiving photodiode through tissue reflection such as skin (the blood flow of subcutaneous tissue pours into more, then it is more to absorb light, it is less to receive photodiode received light, the blood flow pours into less, then it is less to absorb light, it is more to receive photodiode received light), and further obtain the data waveform of PPG signal to received optical signal processing by the treater, obtain corresponding user's cardiovascular characteristic after carrying out analysis processes to this data waveform, like heart rate, blood pressure, blood oxygen etc. in order to monitor user's health index.
However, the accuracy of the PPG signal acquired by the PPG module is low, and the reason is that firstly, when the light signal acquired by the PPG module is strong, the light received by the receiving photodiode is easily in a saturated state, and it cannot be distinguished that the blood flow of the body of the user is small, the absorbed light is small, and further the reflected light is large, or the measurement fails because the reflected light is large due to the ambient light; secondly, the quantity of the reflected light is determined by the temperature and the humidity expressed by the skin of the user, namely, the temperature is high, the higher the humidity is, the less the skin absorbs, the light is emitted strongly, the lower the temperature is, the lower the humidity is, the larger the skin absorbs, and the weaker the light is emitted, so that the quality of the PPG signal can be influenced to a certain extent if the influence caused by the temperature and the humidity is not regulated and controlled; thirdly, if the PPG module is integrated in the wearable device, the wearing condition of the user will affect the quality of the PPG signal, such as whether the user wears, whether the wearing tightness is tight, whether the wearing is inclined, etc. In addition, in the prior art, the collected PPG signals with good accuracy are processed in the next step, and if the collected PPG signals are poor in quality, the quality cannot be used because the cardiovascular characteristics of the user cannot be accurately reflected, so that the workload is wasted to a certain extent.
In view of this, an embodiment of the present invention provides an electronic device, which adjusts a collected PPG signal according to collected temperature data and humidity data, and in addition, detects a situation that a user wears the electronic device in real time to prompt the user to reasonably adjust the electronic device, so as to further improve quality of the collected PPG signal.
Fig. 1 is a schematic structural diagram of an electronic device 10 according to an embodiment of the present invention. The electronic device 10 is a device wearable on the user, including but not limited to an electronic bracelet or the like. The electronic device 10 comprises a temperature sensor 11, a humidity sensor 12, a PPG sensor, and a processor (not shown in the figure), wherein the temperature sensor 11, the humidity sensor 12, and the PPG sensor are all connected with the processor.
The PPG sensor comprises two light emitting diodes 15 and one receiving light diode 16, the number of the light emitting diodes 15 and the number of the receiving light diodes 16 are shown in fig. 1, it is easy to understand that these are only exemplary, and the number of the light emitting diodes 15 and the receiving light diodes 16 can be set according to actual needs. The light emitting diodes 15 comprise one or a combination of green light emitting diodes and red light emitting diodes, and the light receiving diodes 16 comprise one or a combination of light receiving diodes sensitive to the green light spectrum and light receiving diodes sensitive to the red light spectrum. The light emitting diode 15 is used for emitting light to the skin surface of the user, and the receiving diode 16 is used for receiving the light reflected by the skin and other tissues of the user and generating a PPG signal which is sent to the processor, and the processor adjusts the PPG signal.
Because the collected PPG signal is susceptible to other factors in the collecting process, such as the temperature and humidity of the skin surface of the user, if the temperature or humidity of the skin surface of the user is too high, the absorption rate (how much light is absorbed) of the skin of the user is small, and the light received by the photodiode 16 is large, which results in a large waveform of the PPG signal; if the temperature on the surface of the skin of the user is too low or the humidity is low, the absorption rate of the skin of the user is high, the light received by the receiving photodiode 16 is low, and the waveform of the PPG signal is small. It is easy to understand that the waveform of the PPG signal is too large or too small to facilitate the waveform analysis of the PPG signal, so that more accurate cardiovascular data cannot be obtained. Therefore, the influence of temperature and humidity needs to be adjusted.
The temperature sensor 11 uses an infrared temperature measuring element, any object can emit infrared rays when the temperature is higher than absolute zero (-273 ℃), and the infrared temperature measuring element receives the infrared rays to obtain temperature data of the body of a user so as to realize non-contact body surface temperature measurement of the user. The temperature sensor 11 sends the measured temperature data to the processor.
The core element of the humidity sensor 12 is a humidity sensitive resistor or a humidity sensitive capacitor, the humidity sensitive resistor is characterized in that a substrate is covered with a film made of a humidity sensitive material, when water vapor in the air is adsorbed on the humidity sensitive film, the resistivity and the resistance of the humidity sensitive resistor are changed, and the humidity data can be measured by utilizing the characteristic; the humidity-sensitive capacitor is made of a high-molecular film capacitor, common high-molecular materials comprise polystyrene, polyimide, acetate butyrate and the like, when the environmental humidity changes, the dielectric constant of the humidity-sensitive capacitor changes, so that the capacitance of the humidity-sensitive capacitor also changes, and the capacitance change is in direct proportion to humidity data, so that the humidity data are detected. The moisture sensor 12 sends detected moisture data of the skin surface of the user to the processor.
It should be noted that, one measure is a Perfusion Index (PI), or called a blood vessel pulsatility Index (pbi), the PI value reflects the blood flow of the arteriole at the measured site, i.e. reflects the Perfusion of the local tissue, and can be calculated by the formula PI ═ AC amplitude/DC amplitude, and the larger the PI value, the larger the blood flow of the arteriole, the higher the quality of the collected PPG signal is.
The processor will adjust the acquired PPG signal to improve the quality of the PPG signal according to the received temperature and humidity data, wherein the PPG signal comprises an AC signal and a DC signal. The method specifically comprises the following steps: and if the temperature data is smaller than a preset temperature value and the amplitude of the DC signal is larger than a preset amplitude, or the humidity data is smaller than a preset humidity value and the amplitude of the DC signal is larger than a preset amplitude, controlling the current of the light-emitting diode to increase, and/or controlling the bias conversion parameter of the light-emitting diode to increase.
The preset temperature value and the preset humidity value are both the temperature value and the humidity value when the user wears the electronic equipment in advance, the PPG signal is collected for multiple times, the obtained temperature value and humidity value when the quality of the PPG signal is good are easy to understand, and the preset temperature value and the preset humidity value of different users are different. Furthermore, the amplitude of the DC signal is used to characterize the absorption of light by the skin of the user in a manner that: a 1-T-R, where a is the absorption rate, T is the transmittance, and R is the reflectance, the transmittance being determined by T being the intensity of light transmitted through the medium/intensity of output light, and when a skin tissue model is measured, T is 0; the reflectance is a ratio of light intensity detected by the PPG sensor to output light intensity, that is, R is received light intensity/output light intensity or R is received light density/output light density, and the reflectance can also be used as a determination index by using a DC signal, which is easily understood to be linear with the amplitude of the DC signal. In addition, it should be noted that the absorption rate is related to various factors such as skin color depth, skin tissue water saturation, and skin surface dryness and wetness of the user, wherein temperature and humidity are two factors having the greatest influence, and the temperature and humidity are approximately positively correlated, that is, when the temperature is higher, the blood flow of the tissue is higher, the tissue water saturation is higher, and the skin surface is correspondingly more moist, and conversely, when the temperature is lower, the tissue water saturation is lower, and the skin surface is drier.
If temperature data is less than preset temperature value and the amplitude of DC signal is greater than preset amplitude, or humidity data is less than preset humidity value and the amplitude of DC signal is greater than preset amplitude, because the temperature data of position that receives is less than preset temperature value, then the arteriole of position that receives reduces, the amplitude of DC signal is greater than preset amplitude this moment simultaneously, show that the absorption rate of position to light that receives to be measured increases, the light that receive photodiode 16 actually obtained this moment is less, the wave form of the PPG signal that generates is less, the wave form characteristic is typical inadequately, be unfavorable for analyzing cardiovascular characteristic, consequently need gather intervention means.
The intervention means is to control the current of the light emitting diode 15 to increase and/or to control the bias current conversion parameter of the light emitting diode 15 to increase. The current of the light emitting diode 15 is increased, the amplitude of the AC signal and the amplitude of the DC signal are both increased, the amplitude increase amplitude of the AC signal is greater than the amplitude increase amplitude of the DC signal, and the PI value is improved as known from the PI AC amplitude/DC amplitude formula, so that the quality of the PPG signal is improved. In addition, the bias current conversion parameter for controlling the light emitting diode 15 is increased, the amplitude of the AC signal is hardly affected, the amplitude of the DC signal is reduced, and the PI value is improved and the quality of the PPG signal is improved as can be known from the PI-AC amplitude/DC amplitude formula. It is easy to understand that the two regulation and control means can be used simultaneously or respectively to achieve the purpose of improving the quality of the PPG signal.
After the collected PPG signal is regulated, the PPG signal can be amplified to enable the waveform of the PPG signal to be clearer, and further, a quality index needs to be calculated for the regulated PPG signal to determine whether the quality of the PPG signal reaches the standard or not. The quality of the PPG Signal can be determined by calculating the Perfusion Index (PI) of the blood flow, and also by calculating the Signal-to-Noise Ratio (SNR). The PI value is calculated in a manner of PI ═ AC amplitude/DC amplitude, and the signal-to-noise ratio is calculated in a manner of
Wherein Psignal is the power of the AC effective signal, Pnoise is the power of the noise, Asigna is the amplitude of the AC effective signal, and Anoise is the amplitude of the noise. It should be noted that, the determination method of the PPG quality may adopt one calculation method alone or two calculation methods simultaneously, which is easy to understand that the more indicators that determine the PPG signal, the better the quality of the PPG signal.
If the PI value or the signal-to-noise ratio is larger than the threshold value, the quality of the adjusted PPG signal is better, the PPG signal is output as a target PPG signal, and the cardiovascular characteristics are analyzed according to the waveform of the target PPG signal. If the PI value or the signal-to-noise ratio is smaller than the threshold, it indicates that the quality of the adjusted PPG signal does not meet the standard, and further control of parameters of the PPG sensor is required, specifically, the current of the light emitting diode 15 and/or the light receiving diode 16 is controlled to increase, so that more light can be received, and the waveform of the obtained PPG signal is larger.
To make the effect of this modulation of the PPG signal more specific, the following is exemplified:
if the temperature data acquired by the temperature sensor 11 is 23 degrees, the preset temperature value is 28 degrees, and the DC amplitude in the acquired PPG signal is greater than the preset amplitude, the oscillogram of the PPG signal at this time is as shown in fig. 2, where the DC amplitude is greater and the AC amplitude is smaller, so that the oscillogram of the whole PPG signal is smaller, and the waveform characteristics are not typical enough, which is not favorable for cardiovascular characteristic parameter estimation such as heart rate, blood pressure, blood oxygen, and the like. Therefore, the acquired PPG signal is adjusted, that is, the current of the light emitting diode 15 is controlled to increase, and/or the bias current conversion parameter of the light emitting diode 15 is controlled to increase, and the waveform diagram of the adjusted PPG signal is shown in fig. 3.
On the other hand, if the temperature data is greater than the preset temperature value and the amplitude of the DC signal is smaller than the preset amplitude, or the humidity data is greater than the preset humidity value and the amplitude of the DC signal is smaller than the preset amplitude, the current of the light emitting diode 15 is controlled to be properly increased, and/or the bias current conversion parameter of the light emitting diode 15 is controlled to be unchanged, so as to improve the quality of the PPG signal. Because the temperature data of the measured part is greater than the preset temperature value, the arteriole of the measured part expands, and the amplitude of the DC signal is smaller than the preset amplitude, which indicates that the absorption rate of the measured part to light is reduced, at this time, the light actually acquired by the receiving photodiode 16 is more, and the waveform of the generated PPG signal is larger, even overflows, therefore, it is necessary to keep the current and bias current conversion parameters of the led 15 unchanged, or increase the current or bias current conversion parameters of the led 15, respectively, to properly reduce the waveform of the PPG signal, and improve the quality of the PPG signal.
In addition, the electronic device 10 further includes at least two distance sensors 14 and a plurality of pressure sensors 13, so that when the user wears the electronic device 10, the wearing condition of the user is detected in real time, the user can wear the electronic device well, and the quality of collecting the PPG signals is improved.
The plurality of pressure sensors 13 are disposed on a side of the electronic device 10 near the skin of the user, and the pressure sensors 13 are used for detecting the pressure between the electronic device 10 and the surface of the body of the user. If the pressure values measured by the pressure sensors 13 are almost equal and the pressure values are within a certain range, the wearing condition of the user is good; if the pressure values measured by the pressure sensors 13 are larger than a first preset pressure range, prompting a user to wear the clothes too tightly; if the pressure values measured by the pressure sensors 13 are smaller than a first preset pressure range, prompting the user to wear the clothes loosely; if the pressure values measured by the pressure sensors 13 are unequal, and the difference value between any two pressure values is larger than a second preset pressure range, the user is prompted to wear the inclination, and if the user wears the electronic equipment to incline, ambient light permeates into the electronic equipment, so that the quality of the collected PPG signal is affected.
The at least two distance sensors 14 are respectively disposed on two sides of a surface of the electronic device 10 close to the skin of the user, and the distance sensors 14 are configured to measure a distance from the electronic device 10 to the skin of the user, so as to determine a wearing condition according to the distance. The distance sensor 14 uses an infrared distance measurement method, and prompts the user to wear the electronic device 10 if the measured distance is greater than a first preset distance value, and prompts the user to wear the electronic device 10 to be inclined if the difference between any two of the measured distance values is greater than or equal to a second preset distance value, so that the position of the electronic device 10 needs to be adjusted. It will be readily appreciated that the second predetermined distance value is less than the first predetermined distance value.
In this scheme, set up pressure sensor 13 and distance sensor 14 simultaneously for the accessible is carried out dual verification to the condition that the user wore electronic equipment 10, whether wears slope etc. to reduce more and wear not good influence to the quality of gathering the PPG signal.
Fig. 4 is a flowchart illustrating a signal processing method according to an embodiment of the present invention, where the signal processing method is applied to an electronic device 10, and the signal processing method includes:
step S110, a PPG signal is obtained through a PPG sensor arranged on the electronic equipment, and the PPG signal comprises a DC signal.
The PPG sensor is used for collecting optical signals, and the collected optical signals are processed to obtain PPG signals.
Step S120, receiving the temperature data of the user sent by the temperature sensor.
Step S130, receiving the humidity data of the user sent by the humidity sensor.
And step S140, adjusting parameters of the PPG sensor according to the temperature data, the humidity data and the DC signal so as to adjust a PPG signal.
The PPG signal is adjusted by adjusting parameters of the PPG sensor according to the temperature data, the humidity data and the DC signal, so that the influence of the temperature and the humidity on the PPG signal is eliminated.
Referring to fig. 5, the step S140 includes:
step S141, if the temperature data is smaller than a preset temperature value and the amplitude of the DC signal is larger than a preset amplitude, or the humidity data is smaller than a preset humidity value and the amplitude of the DC signal is larger than a preset amplitude, the current of the light emitting diode is controlled to be increased, and/or the bias current conversion parameter of the light emitting diode is controlled to be increased, so that the quality of the PPG signal is improved.
And S142, if the temperature data is greater than a preset temperature value and the amplitude of the DC signal is smaller than a preset amplitude, or the humidity data is greater than a preset humidity value and the amplitude of the DC signal is smaller than a preset amplitude, controlling the current of the light-emitting diode to be reduced, and/or controlling the bias current conversion parameter of the light-emitting diode to be reduced so as to improve the quality of the PPG signal.
And step S150, calculating a quality index according to the adjusted PPG signal, and if the quality index is larger than a threshold value, outputting the PPG signal as a target PPG signal.
After the PPG signal is adjusted, the quality parameter of the PPG signal needs to be calculated to judge whether the quality of the PPG signal meets the requirement, and if the quality parameter is larger than a threshold value, the PPG signal is output as a target PPG signal.
Step S160, if the quality index is smaller than the threshold, controlling the current of the light emitting diode and/or the receiving photodiode to increase, and recalculating whether the quality index is larger than the threshold.
Since the signal processing method has already been explained in the description of the electronic device 10, it will not be described in detail here.
In summary, the signal processing method and the electronic device provided by the embodiments of the present invention are applied to the electronic device. The electronic equipment is provided with a PPG sensor, a humidity sensor, a temperature sensor and a processor, and the PPG sensor, the humidity sensor and the temperature sensor are all connected with the processor. The processor is used for receiving optical signals collected by the PPG sensor and processing the optical signals to obtain PPG signals, the PPG signals comprise DC signals, in addition, the processor is also used for respectively receiving temperature data of a user and humidity data of the user, which are sent by the temperature sensor, and the humidity data of the user, which are sent by the humidity sensor, and adjusting parameters of the PPG sensor according to the temperature data, the humidity data and the DC signals to adjust the PPG signals, so that the quality of the PPG signals is improved. In the scheme, the PPG signal is adjusted through the acquired temperature data and humidity data, so that the accuracy of the PPG is further improved.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
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| TWI828770B (en) * | 2018-09-28 | 2024-01-11 | 愛爾蘭商Ｑ生活全球有限公司 | Method and system for handling ppg signal to noise ratio |
| CN109863703B (en) * | 2019-01-24 | 2022-07-08 | 深圳市汇顶科技股份有限公司 | Signal conditioning method, device, chip, device and storage medium |
| CN113545757B (en) * | 2020-04-26 | 2024-10-18 | 广东小天才科技有限公司 | Core temperature measuring method, device, terminal and storage medium |
| CN113558595B (en) * | 2021-07-29 | 2025-01-21 | 歌尔科技有限公司 | A monitoring method, device and related components of a wearable device |
| CN116185101A (en) * | 2021-11-26 | 2023-05-30 | Oppo广东移动通信有限公司 | Control circuit, method, wearable device and readable storage medium |
| CN117481624B (en) * | 2022-07-25 | 2025-03-28 | 荣耀终端股份有限公司 | Blood pressure measurement method using wearable device and wearable device |
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