Method and apparatus for determining acquisition position of PPG signal

Abstract

The present invention discloses a method and device for determining the acquisition position of PPG signals, including: determining a plurality of first acquisition sensors that need to perform signal quality analysis from all target acquisition sensors; performing time-domain and frequency-domain analysis operations on the PPG signals acquired by each first acquisition sensor to obtain the time-domain and frequency-domain analysis results of the PPG signals; calculating the signal acquisition quality of each first acquisition sensor according to the time-domain and frequency-domain analysis results of the PPG signals corresponding to each first acquisition sensor; screening one acquisition sensor that meets the preset signal acquisition quality condition from all first acquisition sensors according to the signal acquisition quality of all first acquisition sensors, and determining the acquisition position where the selected acquisition sensor is located as the optimal PPG signal acquisition position. It can be seen that the present invention can intelligently determine the optimal acquisition position of PPG signals, improve the accuracy of the determined optimal acquisition position, and thus is beneficial to improving the acquisition accuracy of PPG signals.

Description

Technical Field

[0001] The present invention relates to the technical field of information acquisition, and particularly to a method and device for determining the acquisition position of PPG signals. Background Art

[0002] The PPG signal (i.e., photoplethysmogram signal) is the main source of biological information reflecting the functions of the cardiovascular and autonomic nervous systems, and has important value in reflecting the functions of the cardiovascular and autonomic nervous systems. Detecting the functions of the cardiovascular and autonomic nervous systems through the PPG signal is beneficial to realizing simulation experiments, experimental teaching, and the research and improvement of related medical devices in aspects such as the cardiovascular and autonomic nervous system functions.

[0003] In practical applications, relevant personnel's PPG signals of fingers are usually collected using corresponding collection devices (such as finger clip-type collection devices, wristband-type collection devices, or patch-type collection devices, etc.). The corresponding PPG signal collection points can be as Figure 1 shown Figure 1 which is a schematic diagram of PPG signal collection points disclosed in the prior art. Taking the finger clip-type collection device as an example, one side of the finger clip-type collection device is a light emission device, and the other side is a light reception device. Its corresponding PPG signal collection principle is: when light passes through tissues such as the skin, muscle, and capillaries of the human finger from the light emission device and enters the light reception device, due to the heartbeat causing changes in the volume of capillaries in the human finger tissue, it will affect the light passing rate, further causing the received light intensity to change periodically with the heartbeat cycle. The change in the volume of blood vessels in the human finger tissue is indirectly traced through the change in the intensity of the light received by the light reception device, and then the PPG signal is obtained.

[0004] However, it is found in practice that when collecting PPG signals, the collection position is usually selected depending on the operator's experience. However, due to the differences in the physiological structures of different people, such as the distribution, roughness, etc. of the hand skin, muscle, and blood vessels of each person being different, selecting the collection position depending on the operator's experience will result in inaccurate PPG signals. It can be seen that how to intelligently determine the optimal collection position of PPG signals and then improve the collection accuracy of PPG signals is particularly important. Summary of the Invention

[0005] The present invention provides a method and device for determining the acquisition position of PPG signals, which can intelligently determine the optimal acquisition position of PPG signals, improve the accuracy of the determined optimal acquisition position, and thus is beneficial to improving the acquisition accuracy of PPG signals.

[0006] To solve the above technical problems, a first aspect of the present invention discloses a method for determining the acquisition position of PPG signals, the method comprising:

[0007] The method is applied to a wearable acquisition device, and a plurality of acquisition sensors are arranged on the wearable acquisition device. After the user wears the wearable acquisition device, the acquisition sensors are used to perform signal acquisition operations; the method comprises:

[0008] Obtain the PPG signals collected by each target acquisition sensor, where the target acquisition sensor is an acquisition sensor in a working state among all the acquisition sensors;

[0009] Determine, from all the target acquisition sensors, a plurality of first acquisition sensors that need to perform signal quality analysis;

[0010] For each of the first acquisition sensors, perform time-domain analysis on the PPG signal collected by the first acquisition sensor to obtain the time-domain analysis result of the PPG signal corresponding to the first acquisition sensor, and perform frequency-domain analysis on the PPG signal collected by the first acquisition sensor to obtain the frequency-domain analysis result of the PPG signal corresponding to the first acquisition sensor;

[0011] For each of the first acquisition sensors, calculate the signal acquisition quality of the first acquisition sensor at the corresponding acquisition position according to the time-domain analysis result of the PPG signal corresponding to the first acquisition sensor and the frequency-domain analysis result of the PPG signal corresponding to the first acquisition sensor;

[0012] According to the signal acquisition quality of all the first acquisition sensors at the corresponding acquisition positions, screen out one acquisition sensor that meets the preset signal acquisition quality condition from all the first acquisition sensors, and determine the acquisition position where the screened-out one acquisition sensor is located as the optimal PPG signal acquisition position.

[0013] A second aspect of the present invention discloses a device for determining the acquisition position of PPG signals. The device is applied to a wearable acquisition device, and a plurality of acquisition sensors are arranged on the wearable acquisition device. After the user wears the wearable acquisition device, the acquisition sensors are used to perform signal acquisition operations; the device comprises:

[0014] A signal acquisition module, configured to obtain the PPG signals collected by each target acquisition sensor, where the target acquisition sensor is an acquisition sensor in a working state among all the acquisition sensors;

[0015] A determination module, configured to determine, from all the target acquisition sensors, a plurality of first acquisition sensors that need to perform signal quality analysis;

[0016] A signal quality analysis module is configured to, for each of the first acquisition sensors, perform time-domain analysis operations on the PPG signals acquired by the first acquisition sensor to obtain the time-domain analysis results of the PPG signals corresponding to the first acquisition sensor, and perform frequency-domain analysis operations on the PPG signals acquired by the first acquisition sensor to obtain the frequency-domain analysis results of the PPG signals corresponding to the first acquisition sensor; and calculate the signal acquisition quality of the first acquisition sensor at the corresponding acquisition position according to the time-domain analysis results of the PPG signals corresponding to the first acquisition sensor and the frequency-domain analysis results of the PPG signals corresponding to the first acquisition sensor.

[0017] A screening module is configured to screen, according to the signal acquisition qualities of all the first acquisition sensors at the corresponding acquisition positions, one acquisition sensor that meets the preset signal acquisition quality condition from all the first acquisition sensors, and determine the acquisition position where the selected one acquisition sensor is located as the optimal PPG signal acquisition position.

[0018] As an optional implementation manner, in the second aspect of the present invention, the device further includes:

[0019] A state acquisition module is configured to, after the screening module determines the optimal PPG signal acquisition position, acquire the first physiological structure state parameters corresponding to the adjacent area range of the optimal PPG signal acquisition position.

[0020] An expansion judgment module is configured to judge whether the optimal PPG signal acquisition position meets the acquisition position expansion condition according to the first physiological structure state parameters. When it is judged that the optimal PPG signal acquisition position meets the acquisition position expansion condition, perform an acquisition position expansion operation according to the optimal PPG signal acquisition position to obtain an expanded acquisition position.

[0021] As an optional implementation manner, in the second aspect of the present invention, the specific manner in which the expansion judgment module performs an acquisition position expansion operation according to the optimal PPG signal acquisition position to obtain an expanded acquisition position includes:

[0022] Determine the acquisition position expansion direction relative to the optimal PPG signal acquisition position according to the first physiological structure state parameters and the second physiological structure state parameters at the optimal PPG signal acquisition position;

[0023] In the adjacent area range, perform a physiological structure state traversal operation along the acquisition position expansion direction starting from the optimal PPG signal acquisition position to obtain the physiological structure state traversal results corresponding to different traversal positions.

[0024] Calculate the matching degree between the physiological structure state parameter in the physiological structure state traversal result corresponding to each traversal position and the second physiological structure state parameter, and obtain the first physiological structure state matching degree corresponding to each traversal position;

[0025] According to the first physiological structure state matching degree corresponding to each traversal position and the distance between each traversal position and the optimal PPG signal acquisition position, screen out the target traversal positions from all the traversal positions, where the corresponding first physiological structure state matching degree is greater than or equal to the preset physiological structure state matching degree threshold and the distance value from the optimal PPG signal acquisition position is greater than or equal to the preset distance threshold;

[0026] Determine the target traversal position as the extended acquisition position.

[0027] As an alternative implementation manner, in the second aspect of the present invention, the specific manner in which the extended judgment module determines the acquisition position extension direction relative to the optimal PPG signal acquisition position according to the first physiological structure state parameter and the second physiological structure state parameter at the optimal PPG signal acquisition position includes:

[0028] According to a preset angle, determine a plurality of direction lines with the center point of the optimal PPG signal acquisition position as the reference point, and the included angle between two adjacent direction lines is the preset angle;

[0029] For each direction line, determine the physiological structure state matching region corresponding to the direction line, and calculate the second physiological structure state matching degree between the physiological structure state corresponding to the physiological structure state matching region corresponding to the direction line and the second physiological structure state parameter;

[0030] Determine the target physiological structure state matching region corresponding to the highest physiological structure state matching degree among all the second physiological structure state matching degrees, and determine the direction corresponding to the direction line in the target physiological structure state matching region as the acquisition position extension direction relative to the optimal PPG signal acquisition position.

[0031] As an alternative implementation manner, in the second aspect of the present invention, for each direction line, the specific manner in which the extended judgment module determines the physiological structure state matching region corresponding to the direction line includes:

[0032] Determine the first angle bisector of the first included angle formed by the direction line and the adjacent previous direction line and the second angle bisector of the second included angle formed by the direction line and the adjacent next direction line;

[0033] Determine the first intersection range between the target included angle with the preset angle among the two included angles formed by the first angle bisector and the second angle bisector and the adjacent area range;

[0034] Determine the second intersection range between the area range corresponding to the optimal PPG signal acquisition position and the target included angle;

[0035] Determine the remaining intersection range within the first intersection range excluding the second intersection range as the physiological structure state matching area corresponding to this direction line.

[0036] As an alternative implementation manner, in the second aspect of the present invention, the device further includes:

[0037] A verification and judgment module, configured to perform a verification operation on the optimal PPG signal acquisition position according to the user information of the wearable user of the wearable acquisition device, the comprehensive physiological structure state information of the wearing position where the wearable user wears the wearable acquisition device, and a pre-trained acquisition position positioning model, to obtain a verification result; and determine whether the verification result indicates that the verification of the optimal PPG signal acquisition position is passed. When it is determined that the verification result indicates that the verification of the optimal PPG signal acquisition position is passed, determine the optimal PPG signal acquisition position as the actual PPG signal acquisition position for the wearable user;

[0038] The verification and judgment module is further configured to, when the verification result indicates that the verification of the optimal PPG signal acquisition position fails, perform an optimal acquisition position positioning operation on the wearing position according to the user information of the wearable user of the wearable acquisition device, the comprehensive physiological structure state information of the wearing position where the wearable user wears the wearable acquisition device, and the pre-trained acquisition position positioning model, to obtain an optimal acquisition position positioning result; determine the acquisition position in the optimal acquisition position positioning result as the new optimal PPG signal acquisition position; or, when the verification result indicates that the verification of the optimal PPG signal acquisition position fails, perform a correction operation on the optimal PPG signal acquisition position based on the extended acquisition position, to obtain a new optimal PPG signal acquisition position.

[0039] As an alternative implementation manner, in the second aspect of the present invention, the specific manner for the determination module to determine multiple first acquisition sensors that need to perform signal quality analysis from all the target acquisition sensors includes:

[0040] Determine the waveform parameters of the PPG signals collected by each of the target acquisition sensors;

[0041] According to the waveform parameters of the PPG signals collected by all the target acquisition sensors, all the acquisition sensors whose waveform parameters of the collected PPG signals meet the preset waveform parameter conditions are screened out from all the target acquisition sensors as a plurality of first acquisition sensors that need to perform signal quality analysis.

[0042] The third aspect of the present invention discloses another device for determining the acquisition position of PPG signals. The device is applied to a wearable acquisition device, and a plurality of acquisition sensors are arranged on the wearable acquisition device. After the user wears the wearable acquisition device, the acquisition sensors are used to perform signal acquisition operations. The device includes:

[0043] A memory storing executable program code;

[0044] A processor coupled to the memory;

[0045] The processor calls the executable program code stored in the memory and executes some or all of the steps in the method for determining the acquisition position of PPG signals disclosed in the first aspect of the present invention.

[0046] The fourth aspect of the present invention discloses a computer storage medium. The computer storage medium stores computer instructions, which are used to execute some or all of the steps in the method for determining the acquisition position of PPG signals disclosed in the first aspect of the present invention when called.

[0047] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0048] The embodiments of the present invention can perform time-domain analysis operations and frequency-domain analysis operations on the PPG signals collected by a plurality of first acquisition sensors in a working state and requiring signal quality analysis, obtain corresponding PPG signal time-domain analysis results and PPG signal frequency-domain analysis results, determine the signal acquisition quality corresponding to each first acquisition sensor based on the PPG signal time-domain analysis results and PPG signal frequency-domain analysis results corresponding to each first acquisition sensor, and then determine the optimal PPG signal acquisition position according to the signal acquisition quality. It can be seen that implementing the present invention can intelligently determine the optimal acquisition position of PPG signals, improve the accuracy of the determined optimal acquisition position, and thus is beneficial to improving the acquisition accuracy of PPG signals. In addition, based on the determined optimal acquisition position for signal acquisition, it is also possible to reduce unnecessary signal acquisition operations at other acquisition positions, reduce the acquisition complexity of PPG signals and the power consumption of signal acquisition devices. Description of the Drawings

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0050] Figure 1 is a schematic diagram of the acquisition point positions of a PPG signal disclosed in the prior art;

[0051] Figure 2 is a schematic flowchart of a method for determining the acquisition position of a PPG signal disclosed in an embodiment of the present invention;

[0052] Figure 3 is a schematic flowchart of another method for determining the acquisition position of a PPG signal disclosed in an embodiment of the present invention;

[0053] Figure 4 is a schematic structural diagram of a device for determining the acquisition position of a PPG signal disclosed in an embodiment of the present invention;

[0054] Figure 5 is a schematic structural diagram of another device for determining the acquisition position of a PPG signal disclosed in an embodiment of the present invention;

[0055] Figure 6 is a schematic structural diagram of yet another device for determining the acquisition position of a PPG signal disclosed in an embodiment of the present invention. Detailed implementation manners

[0056] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0057] The terms "first", "second", etc. in the specification and claims of the present invention and the above accompanying drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, device, product, or terminal that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or terminals.

[0058] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the invention. The phrase occurs in various places in the specification and is not necessarily referring to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive of other embodiments. Those skilled in the art will understand explicitly and implicitly that the embodiments described herein can be combined with other embodiments.

[0059] The present invention discloses a method and device for determining the acquisition position of a PPG signal, which can intelligently determine the optimal acquisition position of the PPG signal, improve the accuracy of the determined optimal acquisition position, and thus is beneficial to improving the acquisition accuracy of the PPG signal. In addition, performing signal acquisition based on the determined optimal acquisition position can also reduce unnecessary signal acquisition operations at other acquisition positions, reduce the acquisition complexity of the PPG signal, and the signal acquisition power consumption of the wearable acquisition device. The following will be described in detail respectively.

[0060] Embodiment 1

[0061] Please refer to Figure 2 , Figure 2 which is a schematic flowchart of a method for determining the acquisition position of a PPG signal disclosed in an embodiment of the present invention. Among them, Figure 2 the described method can be applied to an acquisition position determination device, and this acquisition position determination device is used to provide the optimal acquisition position for the PPG signal acquisition operation of the wearable acquisition device or provide a reference basis for determining the optimal acquisition position for the PPG signal acquisition operation of the wearable acquisition device. Moreover, this acquisition position determination device can be integrated in the wearable acquisition device or exist independently of the wearable acquisition device. For example, it can be integrated in the control device of the wearable acquisition device. The embodiments of the present invention do not make limitations. In addition, multiple acquisition sensors are provided on the wearable acquisition device. After the user wears the wearable acquisition device, the acquisition sensors on the wearable acquisition device are used to perform signal acquisition operations to acquire PPG signals. As Figure 2 shown, the method for determining the acquisition position of the PPG signal can include the following operations:

[0062] 101. Obtain the PPG signals acquired by each target acquisition sensor, where the target acquisition sensor is an acquisition sensor in a working state among all acquisition sensors.

[0063] In an embodiment of the present invention, after a user in need of state monitoring (such as vascular sclerosis state monitoring, psychological state monitoring, stress state monitoring, fatigue state monitoring, etc.) wears a wearable acquisition device (such as a wearable glove), all acquisition sensors on the wearable acquisition device can be activated and in a working state, or some acquisition sensors can be in a working state after being activated, and some sensors can be in a closed state or a standby state. When some acquisition sensors are in a working state after being activated, the acquisition sensors in the working state can be selected manually, or determined according to the user information of the user wearing the wearable acquisition device and / or the current wearing posture of the wearable acquisition device (such as wearing on the left hand, wearing on the right hand, wearing forward, wearing backward, etc.), or can be determined by combining the two. The embodiments of the present invention do not make any limitations.

[0064] 102. Determine a plurality of first acquisition sensors that need to perform signal quality analysis from all target acquisition sensors.

[0065] 103. For each first acquisition sensor, perform a time-domain analysis operation on the PPG signal collected by the first acquisition sensor to obtain the time-domain analysis result of the PPG signal corresponding to the first acquisition sensor, and perform a frequency-domain analysis operation on the PPG signal collected by the first acquisition sensor to obtain the frequency-domain analysis result of the PPG signal corresponding to the first acquisition sensor.

[0066] 104. For each first acquisition sensor, calculate the signal acquisition quality of the first acquisition sensor at the corresponding acquisition position according to the time-domain analysis result of the PPG signal corresponding to the first acquisition sensor and the frequency-domain analysis result of the PPG signal corresponding to the first acquisition sensor.

[0067] 105. According to the signal acquisition quality of all first acquisition sensors at the corresponding acquisition positions, select one of the first acquisition sensors that meet the preset signal acquisition quality conditions from all first acquisition sensors, and determine the acquisition position where the selected one of the first acquisition sensors is located as the optimal PPG signal acquisition position.

[0068] In an embodiment of the present invention, after determining the optimal PPG signal acquisition position, the wearable acquisition device can determine the optimal PPG signal acquisition position as the final PPG signal acquisition position, or use the optimal PPG signal acquisition position as a reference for determining the final PPG signal acquisition position.

[0069] It can be seen that implementing the method described in the embodiments of the present invention can intelligently determine the optimal acquisition position of the PPG signal, improve the accuracy of the determined optimal acquisition position, and thus contribute to improving the acquisition accuracy of the PPG signal. In addition, performing signal acquisition based on the determined optimal acquisition position can also reduce unnecessary signal acquisition operations at other acquisition positions, reduce the acquisition complexity of the PPG signal, and the signal acquisition power consumption of the wearable acquisition device.

[0070] In an alternative embodiment, determining, from all target acquisition sensors, a plurality of first acquisition sensors that need to perform signal quality analysis may include:

[0071] Determining all target acquisition sensors as the first acquisition sensors that need to perform signal quality analysis; or,

[0072] Determining the waveform parameters of the PPG signal acquired by each target acquisition sensor;

[0073] Based on the waveform parameters of the PPG signals acquired by all target acquisition sensors, screening all acquisition sensors whose waveform parameters of the acquired PPG signals meet the preset waveform parameter conditions from all target acquisition sensors as the plurality of first acquisition sensors that need to perform signal quality analysis.

[0074] In this alternative embodiment, further optionally, based on the waveform parameters of the PPG signals acquired by all target acquisition sensors, screening all acquisition sensors whose waveform parameters of the acquired PPG signals meet the preset waveform parameter conditions from all target acquisition sensors as the plurality of first acquisition sensors that need to perform signal quality analysis may include:

[0075] Based on the PPG signals acquired by all target acquisition sensors, determining the waveform continuity degree of the PPG signal acquired by each target acquisition sensor as the waveform parameter of the PPG signal acquired by each target acquisition sensor; optionally, the waveform continuity degree of the PPG signal is determined based on at least one of the number of continuous waveform segments of the PPG signal within its corresponding acquisition time range, the interval duration between all adjacent two continuous waveform segments, and the waveform amplitude difference situation between all adjacent two continuous waveform segments;

[0076] Screening all acquisition sensors whose waveform continuity degree of the acquired PPG signals is greater than or equal to the preset degree threshold from all target acquisition sensors as the plurality of first acquisition sensors that need to perform signal quality analysis;

[0077] Or,

[0078] Determine the waveform amplitude range of the PPG signals collected by each target acquisition sensor. According to the waveform amplitude range of the PPG signals collected by each target acquisition sensor and the pre-set state monitoring reference waveform amplitude range, calculate the waveform amplitude deviation degree of the waveform amplitude range of the PPG signals collected by each target acquisition sensor compared to the state monitoring reference waveform amplitude range, and use it as the waveform parameter of the PPG signals collected by each target acquisition sensor; optionally, the state monitoring reference waveform amplitude range corresponds to the user state to be monitored.

[0079] Screen out the acquisition sensors from all target acquisition sensors whose waveform amplitude deviation degree of the waveform amplitude range of the PPG signals collected compared to the state monitoring reference waveform amplitude range is less than or equal to the preset deviation degree threshold, and use them as multiple first acquisition sensors that need to perform signal quality analysis.

[0080] It can be seen that this optional embodiment provides diversified determination methods for the acquisition sensors that need to perform signal quality analysis. The first method directly determines all target sensors in the working state (i.e., the signal acquisition state) as the first acquisition sensors that need to perform signal quality analysis. This method is beneficial to improving the comprehensiveness of PPG signal analysis. The second method is to determine the acquisition sensors corresponding to the PPG signals with qualified waveform parameters as the first acquisition sensors that need to perform signal quality analysis according to the waveform parameters of the PPG signals collected by the target acquisition sensors. This method can filter out the PPG signals that do not need to perform signal quality analysis before performing signal quality analysis, reduce unnecessary signal quality analysis operations while improving the accuracy of signal quality analysis, and is beneficial to improving the efficiency of signal quality analysis, and thus beneficial to improving the determination efficiency of the optimal PPG signal acquisition position.

[0081] In another optional embodiment, for each of the first acquisition sensors, calculating the signal acquisition quality of the first acquisition sensor at the corresponding acquisition position according to the time-domain analysis result of the PPG signal corresponding to the first acquisition sensor and the frequency-domain analysis result of the PPG signal corresponding to the first acquisition sensor may include:

[0082] For each of the first acquisition sensors, calculate the time-domain score value of the waveform morphology of the PPG signal corresponding to the first acquisition sensor according to the time-domain analysis result of the PPG signal corresponding to the first acquisition sensor, and calculate the frequency-domain score value according to the time-domain analysis result of the PPG signal corresponding to the first acquisition sensor. According to the time-domain score value of the waveform morphology and the frequency-domain score value, calculate the signal acquisition quality score of the first acquisition sensor at the corresponding acquisition position. For example: calculate the average value of the two as the signal acquisition quality score of the first acquisition sensor at the corresponding acquisition position.

[0083] Optionally, the time-domain score value of the waveform morphology is specifically determined according to the ratio of the number of effective waveforms corresponding to the PPG signal to the total number of waveforms corresponding to the PPG signal.

[0084] Optionally, the frequency-domain score value of the waveform is determined according to the degree of spectral shift. Further, the degree of spectral shift is obtained by segmenting the waveform corresponding to the PPG signal, performing band-pass filtering, and then calculating the power ratio of the waveform power spectral density, main frequency position, and main frequency of the obtained waveform segment to the second harmonic and the third harmonic respectively. Still further, the degree of spectral shift is the percentage p, and the frequency-domain score value of the waveform is equal to (1 - p) * 100.

[0085] It can be seen that this optional embodiment provides an intelligent processing and analysis method for the signal acquisition quality of the first acquisition sensor at the corresponding acquisition position, which can comprehensively analyze the signal acquisition quality at different acquisition positions from both the frequency domain and the time domain, is beneficial to improving the accuracy of the calculated signal acquisition quality, and further is beneficial to improving the determination efficiency and determination accuracy of the optimal PPG signal acquisition position.

[0086] In yet another optional embodiment, the method may further include:

[0087] After determining the above optimal PPG signal acquisition position, the PPG signal collected by the acquisition sensor at the optimal PPG signal acquisition position is determined as the optimal PPG signal;

[0088] Based on the optimal PPG signal, the corresponding state of the wearable acquisition device's wearing user is analyzed to obtain an analysis result.

[0089] It can be seen that this optional embodiment can also, after determining the optimal PPG signal acquisition position, realize the intelligent analysis of the user's state (such as the user's mental state and the user's physiological state) based on the PPG signal collected by the acquisition sensor at the optimal PPG signal acquisition position, which is beneficial to improving the efficiency and accuracy of user state analysis based on the PPG signal.

[0090] Embodiment 2

[0091] Please refer to Figure 3 , Figure 3 which is a schematic flowchart of another method for determining the acquisition position of the PPG signal disclosed in the embodiments of the present invention. Among them, Figure 3The described method can be applied to a collection position determination device, and the collection position determination device is used to provide an optimal collection position for a wearable collection device to perform a PPG signal collection operation or provide a reference for determining the optimal collection position for the wearable collection device to perform a PPG signal collection operation. The collection position determination device can be integrated into the wearable collection device or exist independently of the wearable collection device. For example, it can be integrated into the control device of the wearable collection device. The embodiments of the present invention do not make limitations. In addition, a plurality of collection sensors are provided on the wearable collection device. After the user wears the wearable collection device, the collection sensors on the wearable collection device are used to perform a signal collection operation to collect PPG signals. As Figure 3 shown, the method for determining the collection position of the PPG signal may include the following operations:

[0092] 201. Obtain the PPG signals collected by each target collection sensor, where the target collection sensor is a collection sensor in a working state among all collection sensors.

[0093] 202. Determine a plurality of first collection sensors that need to perform signal quality analysis from all target collection sensors.

[0094] 203. For each first collection sensor, perform a time-domain analysis operation on the PPG signal collected by the first collection sensor to obtain the time-domain analysis result of the PPG signal corresponding to the first collection sensor, and perform a frequency-domain analysis operation on the PPG signal collected by the first collection sensor to obtain the frequency-domain analysis result of the PPG signal corresponding to the first collection sensor.

[0095] 204. For each first collection sensor, calculate the signal collection quality of the first collection sensor at the corresponding collection position according to the time-domain analysis result of the PPG signal corresponding to the first collection sensor and the frequency-domain analysis result of the PPG signal corresponding to the first collection sensor.

[0096] 205. According to the signal collection quality of all first collection sensors at the corresponding collection positions, screen out one of the collection sensors that meet the preset signal collection quality conditions from all first collection sensors, and determine the collection position where the selected one collection sensor is located as the optimal PPG signal collection position.

[0097] In the embodiments of the present invention, for the relevant detailed descriptions of steps 201 to 205, please refer to the relevant detailed descriptions of steps 101 to 105 in Embodiment 1, and the embodiments of the present invention will not be elaborated here.

[0098] 206. After determining the optimal PPG signal collection position, collect the first physiological structure state parameters corresponding to the adjacent area range of the optimal PPG signal collection position.

[0099] 207. Determine whether the optimal PPG signal acquisition position satisfies the acquisition position expansion condition according to the first physiological structure state parameter. When the judgment result of step 207 is yes, trigger the execution of step 208. When the judgment result of step 207 is no, trigger the execution of step 209.

[0100] 208. Perform an acquisition position expansion operation according to the optimal PPG signal acquisition position to obtain an expanded acquisition position.

[0101] In the embodiment of the present invention, after obtaining the expanded acquisition position, the expanded acquisition position can be determined as another optimal PPG signal acquisition position and jointly output the optimal PPG signal together with the optimal PPG signal acquisition position determined in step 205. Or the expanded acquisition position can be used as the new optimal PPG signal acquisition position. Or one of the optimal PPG signal acquisition position determined in step 205 and the expanded acquisition position with the highest user adaptability can be selected as the final PPG signal acquisition position. The embodiment of the present invention does not make a limitation.

[0102] 209. Use the PPG signal acquired at the above optimal PPG signal acquisition position as the optimal PPG signal, perform user state analysis based on the optimal PPG signal, or provide the optimal PPG signal to the user state monitoring device.

[0103] It can be seen that implementing the method described in the embodiment of the present invention can intelligently determine the optimal acquisition position of the PPG signal, improve the accuracy of the determined optimal acquisition position, and thus is beneficial to improving the acquisition accuracy of the PPG signal. In addition, performing signal acquisition based on the determined optimal acquisition position can also reduce unnecessary signal acquisition operations at other acquisition positions, reduce the acquisition complexity of the PPG signal and the signal acquisition power consumption of the wearable acquisition device. Further, it is also possible to perform position expansion based on the determined optimal PPG signal acquisition position to obtain an expanded acquisition position, which is beneficial to improving the comprehensiveness and accuracy of the determined optimal PPG signal acquisition position, and thus is beneficial to improving the accuracy of user state analysis.

[0104] In an alternative embodiment, the above performing an acquisition position expansion operation according to the optimal PPG signal acquisition position to obtain an expanded acquisition position may include:

[0105] Determine the acquisition position expansion direction relative to the optimal PPG signal acquisition position according to the first physiological structure state parameter and the second physiological structure state parameter at the optimal PPG signal acquisition position;

[0106] Within the adjacent area range, starting from the optimal PPG signal acquisition position, perform a traversal operation on the physiological structure state along the acquisition position expansion direction to obtain the traversal results of the physiological structure state corresponding to different traversal positions;

[0107] Calculate the matching degree between the physiological structure state parameters in the traversal results of the physiological structure state corresponding to each traversal position and the second physiological structure state parameters to obtain the first physiological structure state matching degree corresponding to each traversal position;

[0108] According to the first physiological structure state matching degree corresponding to each traversal position and the distance of each traversal position from the optimal PPG signal acquisition position, screen the target traversal positions from all traversal positions where the corresponding first physiological structure state matching degree is greater than or equal to the preset physiological structure state matching degree threshold and the distance value from the optimal PPG signal acquisition position is greater than or equal to the preset distance threshold;

[0109] Determine the target traversal position as the expansion acquisition position.

[0110] Optionally, the physiological structure state parameters involved above may include at least one of skin state parameters, muscle state parameters, blood vessel distribution parameters, etc. at the corresponding positions. Further, the skin state parameters may include skin roughness and / or skin flatness.

[0111] It can be seen that this optional embodiment provides an intelligent determination method for the expansion acquisition position, which can determine the position at a certain distance from the determined optimal PPG signal acquisition position and with a large matching degree between the physiological structure state parameters and the physiological structure state parameters at the optimal PPG signal acquisition position as the expansion acquisition position, which can not only reduce the repeated acquisition operation of the PPG signal to a certain extent, but also improve the comprehensiveness and accuracy of the finally determined optimal PPG signal acquisition position.

[0112] In this optional embodiment, further optionally, the above determination of the acquisition position expansion direction relative to the optimal PPG signal acquisition position according to the first physiological structure state parameters and the second physiological structure state parameters at the optimal PPG signal acquisition position may include:

[0113] According to the preset angle, determine a plurality of direction lines with the center point of the optimal PPG signal acquisition position as the reference point, and the included angle between two adjacent direction lines is the preset angle;

[0114] For each direction line, determine the physiological structure state matching area corresponding to the direction line, and calculate the second physiological structure state matching degree between the physiological structure state corresponding to the physiological structure state matching area corresponding to the direction line and the second physiological structure state parameters;

[0115] Determine a target physiological structure state matching area corresponding to the highest physiological structure state matching degree among all second physiological structure state matching degrees, and determine the direction corresponding to the direction line in the target physiological structure state matching area as the acquisition position expansion direction compared to the optimal PPG signal acquisition position.

[0116] It can be seen that this optional embodiment also provides an intelligent method for determining the expansion direction of the collection position, which is beneficial to improving the accuracy and efficiency of the determined expansion direction of the collection position, and further beneficial to improving the efficiency and accuracy of determining the expanded collection position.

[0117] In this optional embodiment, further optionally, for each direction line, the above-mentioned determination of the physiological structure state matching area corresponding to the direction line may include:

[0118] Determine a first angle bisector of a first angle formed by the direction line and a preceding adjacent direction line and a second angle bisector of a second angle formed by the direction line and a succeeding adjacent direction line;

[0119] Determine a first intersection range of a target angle whose angle is a preset angle among two angles formed by the first angle bisector and the second angle bisector and a range of an adjacent area;

[0120] Determine a second intersection range of the area range corresponding to the optimal PPG signal acquisition position and the target angle;

[0121] The remaining intersection range within the first intersection range except the second intersection range is determined as the physiological structure state matching area corresponding to the direction line.

[0122] It can be seen that this optional embodiment can also provide an intelligent determination method for the physiological structure state matching area corresponding to the direction line, that is: the remaining intersection range within the first intersection range except the second intersection range is determined as the physiological structure state matching area corresponding to the direction line, which is conducive to improving the efficiency of intelligent determination of the physiological structure state matching area corresponding to the direction line.

[0123] In another optional embodiment, the method may further include the following operations:

[0124] According to the user information of the user wearing the wearable acquisition device, the comprehensive physiological structure state information of the wearing position of the wearable acquisition device worn by the user, and the pre-trained acquisition position positioning model, a verification operation is performed on the optimal PPG signal acquisition position to obtain a verification result;

[0125] Determine whether the verification result indicates that the verification of the optimal PPG signal acquisition position is passed. When it is determined that the verification result indicates that the verification of the optimal PPG signal acquisition position is passed, determine the optimal PPG signal acquisition position as the actual PPG signal acquisition position for the wearable user;

[0126] When the verification result indicates that the verification of the optimal PPG signal acquisition position fails, perform an optimal acquisition position positioning operation on the wearing position according to the user information of the wearable user of the wearable acquisition device, the comprehensive physiological structure state information of the wearing position where the wearable user wears the wearable acquisition device, and the pre-trained acquisition position positioning model, and obtain an optimal acquisition position positioning result;

[0127] Determine the acquisition position in the optimal acquisition position positioning result as the new optimal PPG signal acquisition position; or,

[0128] When the verification result indicates that the verification of the optimal PPG signal acquisition position fails, perform a correction operation on the optimal PPG signal acquisition position based on the extended acquisition position to obtain a new optimal PPG signal acquisition position.

[0129] It can be seen that this optional embodiment can further perform a verification operation on the optimal PPG signal acquisition position based on the user information of the wearable user of the wearable acquisition device, the comprehensive physiological structure state information of the wearing position where the wearable user wears the wearable acquisition device, and the pre-trained acquisition position positioning model after determining the optimal PPG signal acquisition position based on the signal quality analysis method, which is beneficial to improving the accuracy of the finally determined optimal PPG signal acquisition position, and further beneficial to improving the accuracy of the optimal PPG signal.

[0130] It should be noted that for other related descriptions in the embodiments of the present invention, please specifically refer to the related descriptions in Embodiment 1, and the embodiments of the present invention will not be repeated.

[0131] Embodiment 3

[0132] Please refer to Figure 4 , Figure 4 which is a schematic structural diagram of a device for determining the acquisition position of a PPG signal disclosed in the embodiments of the present invention. Among them, Figure 4The described device is used to provide an optimal acquisition position for the PPG signal acquisition operation of a wearable acquisition device or to provide a reference for determining the optimal acquisition position for the PPG signal acquisition operation of a wearable acquisition device. Moreover, this device can be integrated into the wearable acquisition device or exist independently of the wearable acquisition device. For example, it can be integrated into the control device of the wearable acquisition device. The embodiments of the present invention do not make any limitations. In addition, multiple acquisition sensors are provided on the wearable acquisition device. After the user wears the wearable acquisition device, the acquisition sensors on the wearable acquisition device are used to perform signal acquisition operations to acquire PPG signals. As Figure 4 shown, the device for determining the acquisition position of the PPG signal may include:

[0133] A signal acquisition module 301, configured to obtain the PPG signals acquired by each target acquisition sensor, where the target acquisition sensor is an acquisition sensor in a working state among all the acquisition sensors;

[0134] A determination module 302, configured to determine, from all the target acquisition sensors, a plurality of first acquisition sensors that need to perform signal quality analysis;

[0135] A signal quality analysis module 303, configured to, for each first acquisition sensor, perform time-domain analysis on the PPG signal acquired by the first acquisition sensor to obtain the time-domain analysis result of the PPG signal corresponding to the first acquisition sensor, and perform frequency-domain analysis on the PPG signal acquired by the first acquisition sensor to obtain the frequency-domain analysis result of the PPG signal corresponding to the first acquisition sensor; and calculate the signal acquisition quality of the first acquisition sensor at the corresponding acquisition position according to the time-domain analysis result of the PPG signal corresponding to the first acquisition sensor and the frequency-domain analysis result of the PPG signal corresponding to the first acquisition sensor;

[0136] A screening module 304, configured to, according to the signal acquisition quality of all the first acquisition sensors at the corresponding acquisition positions, screen out one acquisition sensor that meets the preset signal acquisition quality condition from all the first acquisition sensors, and determine the acquisition position where the screened one acquisition sensor is located as the optimal PPG signal acquisition position.

[0137] It can be seen that implementing Figure 4 the described device can intelligently determine the optimal acquisition position of the PPG signal, improve the accuracy of the determined optimal acquisition position, and thus is conducive to improving the acquisition accuracy of the PPG signal. In addition, performing signal acquisition based on the determined optimal acquisition position can also reduce unnecessary signal acquisition operations at other acquisition positions, reduce the acquisition complexity of the PPG signal, and reduce the signal acquisition power consumption of the wearable acquisition device.

[0138] In an alternative embodiment, asFigure 5 As shown, the device may further include:

[0139] A status acquisition module 305, configured to acquire first physiological structure status parameters corresponding to a neighboring area range of the optimal PPG signal acquisition position after the screening module 304 determines the optimal PPG signal acquisition position;

[0140] An expansion judgment module 306, configured to judge whether the optimal PPG signal acquisition position meets the acquisition position expansion condition according to the first physiological structure status parameters. When it is judged that the optimal PPG signal acquisition position meets the acquisition position expansion condition, perform an acquisition position expansion operation according to the optimal PPG signal acquisition position to obtain an expanded acquisition position.

[0141] It can be seen that implementing Figure 5 The described device can also perform position expansion based on the determined optimal PPG signal acquisition position to obtain an expanded acquisition position, which is beneficial to improving the comprehensiveness and accuracy of the determined optimal PPG signal acquisition position, and further beneficial to improving the accuracy of user status analysis.

[0142] In another optional embodiment, the specific manner in which the expansion judgment module 306 judges whether the optimal PPG signal acquisition position meets the acquisition position expansion condition according to the first physiological structure status parameters and performs an acquisition position expansion operation according to the optimal PPG signal acquisition position to obtain an expanded acquisition position may include:

[0143] Determine an acquisition position expansion direction relative to the optimal PPG signal acquisition position according to the first physiological structure status parameters and the second physiological structure status parameters at the optimal PPG signal acquisition position;

[0144] Within the neighboring area range, perform a physiological structure status traversal operation starting from the optimal PPG signal acquisition position along the acquisition position expansion direction to obtain physiological structure status traversal results corresponding to different traversal positions;

[0145] Calculate the matching degree between the physiological structure status parameters in the physiological structure status traversal results corresponding to each traversal position and the second physiological structure status parameters to obtain a first physiological structure status matching degree corresponding to each traversal position;

[0146] According to the first physiological structure status matching degree corresponding to each traversal position and the distance between each traversal position and the optimal PPG signal acquisition position, screen target traversal positions from all traversal positions whose corresponding first physiological structure status matching degree is greater than or equal to a preset physiological structure status matching degree threshold and the distance value from the optimal PPG signal acquisition position is greater than or equal to a preset distance threshold;

[0147] Determine the target traversal position as the extended acquisition position.

[0148] It can be seen that this optional embodiment provides an intelligent method for determining the extended acquisition position, which can determine the position at a certain distance from the optimal PPG signal acquisition position determined and having a large matching degree between the physiological structure state parameters and the physiological structure state parameters at the optimal PPG signal acquisition position as the extended acquisition position. This can not only reduce the repeated acquisition operations of PPG signals to a certain extent, but also improve the comprehensiveness and accuracy of the finally determined optimal PPG signal acquisition position.

[0149] In another optional embodiment, the specific manner in which the extension judgment module 306 determines the acquisition position extension direction relative to the optimal PPG signal acquisition position according to the first physiological structure state parameter and the second physiological structure state parameter at the optimal PPG signal acquisition position may include:

[0150] According to a preset angle, determine a plurality of direction lines with the center point of the optimal PPG signal acquisition position as the reference point, and the included angle between two adjacent direction lines is the preset angle;

[0151] For each direction line, determine the physiological structure state matching region corresponding to the direction line, and calculate the second physiological structure state matching degree between the physiological structure state corresponding to the physiological structure state matching region corresponding to the direction line and the second physiological structure state parameter.

[0152] Determine the target physiological structure state matching region corresponding to the highest physiological structure state matching degree among all the second physiological structure state matching degrees, and determine the direction corresponding to the direction line in the target physiological structure state matching region as the acquisition position extension direction relative to the optimal PPG signal acquisition position.

[0153] It can be seen that this optional embodiment provides an intelligent method for determining the acquisition position extension direction, which is beneficial to improving the accuracy and efficiency of the determined acquisition position extension direction, and thus beneficial to improving the determination efficiency and accuracy of the extended acquisition position.

[0154] In another optional embodiment, for each direction line, the specific manner in which the extension judgment module 306 determines the physiological structure state matching region corresponding to the direction line may include:

[0155] Determine the first angle bisector of the first included angle formed by the direction line and the adjacent previous direction line and the second angle bisector of the second included angle formed by the direction line and the adjacent next direction line;

[0156] Determine the first intersection range of the target included angle with an angle of the preset angle and the adjacent region range among the two included angles formed by the first angle bisector and the second angle bisector;

[0157] Determine the second intersection range of the area range corresponding to the optimal PPG signal acquisition position and the target angle;

[0158] Determine the remaining intersection range within the first intersection range except the second intersection range as the physiological structure state matching area corresponding to this direction line.

[0159] It can be seen that this optional embodiment provides an intelligent determination method for the physiological structure state matching area corresponding to a direction line, that is: determine the remaining intersection range within the first intersection range except the second intersection range as the physiological structure state matching area corresponding to this direction line, which is beneficial to improving the intelligent determination efficiency of the physiological structure state matching area corresponding to the direction line.

[0160] In another optional embodiment, as Figure 5 shown, the device may further include:

[0161] A verification and judgment module 307, configured to perform a verification operation on the optimal PPG signal acquisition position according to the user information of the wearable acquisition device's wearing user, the comprehensive physiological structure state information of the wearing position where the wearing user wears the wearable acquisition device, and a pre-trained acquisition position positioning model, to obtain a verification result; and, determine whether the verification result indicates that the verification of the optimal PPG signal acquisition position is passed. When it is determined that the verification result indicates that the verification of the optimal PPG signal acquisition position is passed, determine the optimal PPG signal acquisition position as the actual PPG signal acquisition position for the wearing user;

[0162] The verification and judgment module 307 is further configured to, when the verification result indicates that the verification of the optimal PPG signal acquisition position fails, perform an optimal acquisition position positioning operation on the wearing position according to the user information of the wearable acquisition device's wearing user, the comprehensive physiological structure state information of the wearing position where the wearing user wears the wearable acquisition device, and a pre-trained acquisition position positioning model, to obtain an optimal acquisition position positioning result; determine the acquisition position in the optimal acquisition position positioning result as the new optimal PPG signal acquisition position; or, when the verification result indicates that the verification of the optimal PPG signal acquisition position fails, perform a correction operation on the optimal PPG signal acquisition position based on the expanded acquisition position, to obtain the new optimal PPG signal acquisition position.

[0163] It can be seen that, after determining the optimal PPG signal acquisition position based on signal quality analysis, this optional embodiment can further perform a verification operation on the optimal PPG signal acquisition position based on the user information of the wearable user of the wearable acquisition device, the comprehensive physiological structure state information of the wearable position where the wearable user wears the wearable acquisition device, and a pre-trained acquisition position positioning model, which is beneficial to improving the accuracy of the finally determined optimal PPG signal acquisition position, and further beneficial to improving the accuracy of the optimal PPG signal.

[0164] In another optional embodiment, the specific manner for the determining module 302 to determine, from all target acquisition sensors, a plurality of first acquisition sensors that need to perform signal quality analysis includes:

[0165] Determine the waveform parameters of the PPG signals collected by each target acquisition sensor;

[0166] According to the waveform parameters of the PPG signals collected by all target acquisition sensors, screen out all acquisition sensors whose waveform parameters of the collected PPG signals meet the preset waveform parameter conditions from all target acquisition sensors as a plurality of first acquisition sensors that need to perform signal quality analysis.

[0167] It can be seen that this optional embodiment can also filter out PPG signals that do not need to perform signal quality analysis before signal quality analysis, reduce unnecessary signal quality analysis operations while improving the accuracy of signal quality analysis, which is beneficial to improving the efficiency of signal quality analysis, and further beneficial to improving the efficiency of determining the optimal PPG signal acquisition position.

[0168] Embodiment 4

[0169] Please refer to Figure 6 , Figure 6 which is a schematic structural diagram of another PPG signal acquisition position determination device disclosed in the embodiments of the present invention. Among them, Figure 6 the described device is used to provide the optimal acquisition position for the PPG signal acquisition operation of the wearable acquisition device or provide a reference basis for determining the optimal acquisition position for the PPG signal acquisition operation of the wearable acquisition device, and this device can be integrated in the wearable acquisition device or exist independently of the wearable acquisition device. For example, it can be integrated in the control device of the wearable acquisition device. The embodiments of the present invention do not make limitations. In addition, a plurality of acquisition sensors are provided on the wearable acquisition device. After the user wears the wearable acquisition device, the acquisition sensors on the wearable acquisition device are used to perform signal acquisition operations to acquire PPG signals. As Figure 6 shown, the PPG signal acquisition position determination device may include:

[0170] A memory 401 storing executable program code;

[0171] A processor 402 coupled to the memory 401;

[0172] The processor 402 calls the executable program code stored in the memory 401 and executes the steps in the method for determining the acquisition position of the PPG signal described in Embodiment 1 or Embodiment 2 of the present invention.

[0173] Embodiment 5

[0174] Embodiment of the present invention discloses a computer storage medium, which stores computer instructions. When the computer instructions are called, they are used to execute the steps in the method for determining the acquisition position of the PPG signal described in Embodiment 1 or Embodiment 2 of the present invention.

[0175] Embodiment 6

[0176] Embodiment of the present invention discloses a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to execute the steps in the method for determining the acquisition position of the PPG signal described in Embodiment 1 or Embodiment 2.

[0177] Embodiment 7

[0178] Embodiment of the present invention discloses a signal acquisition device. Optionally, the signal acquisition device can be a wearable acquisition device, and the signal acquisition device can be used to execute the steps in the method for determining the acquisition position of the PPG signal described in Embodiment 1 or Embodiment 2, or can include the device for determining the acquisition position of the PPG signal described in any one of Embodiment 3.

[0179] The device embodiments described above are only illustrative. The modules described as separate components may or may not be physically separated. The components shown as modules may or may not be physical modules, that is, they may be located in one place, or may be distributed to multiple network modules. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative labor.

[0180] Through the specific descriptions of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, and the storage medium includes read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc memories, magnetic disk memories, tape memories, or any other medium that can be used to carry or store data and is computer-readable.

[0181] Finally, it should be noted that: The method and device for determining the acquisition position of a PPG signal disclosed in the embodiments of the present invention only disclose the preferred embodiments of the present invention, and are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining the acquisition position of PPG signals, characterized in that, the method is applied to a wearable acquisition device, and a plurality of acquisition sensors are arranged on the wearable acquisition device. After the user wears the wearable acquisition device, the acquisition sensors are used to perform signal acquisition operations; the method includes: Obtain the PPG signals acquired by each target acquisition sensor, where the target acquisition sensor is an acquisition sensor in a working state among all the acquisition sensors; Determine a plurality of first acquisition sensors that need to perform signal quality analysis from all the target acquisition sensors; For each of the first acquisition sensors, perform time-domain analysis on the PPG signal acquired by the first acquisition sensor to obtain the time-domain analysis result of the PPG signal corresponding to the first acquisition sensor, and perform frequency-domain analysis on the PPG signal acquired by the first acquisition sensor to obtain the frequency-domain analysis result of the PPG signal corresponding to the first acquisition sensor; For each of the first acquisition sensors, calculate the signal acquisition quality of the first acquisition sensor at the corresponding acquisition position according to the time-domain analysis result of the PPG signal corresponding to the first acquisition sensor and the frequency-domain analysis result of the PPG signal corresponding to the first acquisition sensor; According to the signal acquisition quality of all the first acquisition sensors at the corresponding acquisition positions, select one acquisition sensor that meets the preset signal acquisition quality condition from all the first acquisition sensors, and determine the acquisition position where the selected one acquisition sensor is located as the optimal PPG signal acquisition position; wherein, the determining a plurality of first acquisition sensors that need to perform signal quality analysis from all the target acquisition sensors includes: Determine the waveform parameters of the PPG signals acquired by each of the target acquisition sensors; According to the waveform parameters of the PPG signals acquired by all the target acquisition sensors, select all the acquisition sensors whose waveform parameters of the acquired PPG signals meet the preset waveform parameter conditions from all the target acquisition sensors as a plurality of first acquisition sensors that need to perform signal quality analysis.

2. The method for determining the acquisition position of PPG signals according to claim 1, characterized in that, the method further includes: After determining the optimal PPG signal acquisition position, acquire the first physiological structure state parameters corresponding to the adjacent area range of the optimal PPG signal acquisition position; Judge whether the optimal PPG signal acquisition position meets the acquisition position expansion condition according to the first physiological structure state parameters. When it is judged that the optimal PPG signal acquisition position meets the acquisition position expansion condition, perform an acquisition position expansion operation according to the optimal PPG signal acquisition position to obtain an expanded acquisition position.

3. The method for determining the acquisition position of PPG signals according to claim 2, characterized in that, the performing an acquisition position expansion operation according to the optimal PPG signal acquisition position to obtain an expanded acquisition position includes: Determine the acquisition position expansion direction relative to the optimal PPG signal acquisition position according to the first physiological structure state parameter and the second physiological structure state parameter at the optimal PPG signal acquisition position; Within the adjacent area range, perform a physiological structure state traversal operation starting from the optimal PPG signal acquisition position along the acquisition position expansion direction to obtain physiological structure state traversal results corresponding to different traversal positions; Calculate the matching degree between the physiological structure state parameter in the physiological structure state traversal result corresponding to each traversal position and the second physiological structure state parameter to obtain the first physiological structure state matching degree corresponding to each traversal position; According to the first physiological structure state matching degree corresponding to each traversal position and the distance between each traversal position and the optimal PPG signal acquisition position, screen out target traversal positions from all the traversal positions whose corresponding first physiological structure state matching degree is greater than or equal to a preset physiological structure state matching degree threshold and the distance value from the optimal PPG signal acquisition position is greater than or equal to a preset distance threshold; Determine the target traversal position as the expanded acquisition position.

4. The method for determining the acquisition position of the PPG signal according to claim 3, wherein, the determining the acquisition position expansion direction relative to the optimal PPG signal acquisition position according to the first physiological structure state parameter and the second physiological structure state parameter at the optimal PPG signal acquisition position includes: Determine a plurality of direction lines based on the center point of the optimal PPG signal acquisition position according to a preset angle, and the included angle between two adjacent direction lines is the preset angle; For each direction line, determine the physiological structure state matching area corresponding to the direction line, and calculate the second physiological structure state matching degree between the physiological structure state corresponding to the physiological structure state matching area corresponding to the direction line and the second physiological structure state parameter; Determine the target physiological structure state matching area corresponding to the highest physiological structure state matching degree among all the second physiological structure state matching degrees, and determine the direction corresponding to the direction line in the target physiological structure state matching area as the acquisition position expansion direction relative to the optimal PPG signal acquisition position.

5. The method for determining the acquisition position of the PPG signal according to claim 4, wherein, for each direction line, the determining the physiological structure state matching area corresponding to the direction line includes: Determine the first angle bisector of the first included angle formed by the direction line and the adjacent previous direction line and the second angle bisector of the second included angle formed by the direction line and the adjacent next direction line; Determine the first intersection range of the target included angle with an angle of the preset angle among the two included angles formed by the first angle bisector and the second angle bisector and the adjacent area range; Determine the second intersection range of the area range corresponding to the optimal PPG signal acquisition position and the target included angle; Determine the remaining intersection range within the first intersection range except the second intersection range as the physiological structure state matching area corresponding to the direction line.

6. The method for determining the acquisition position of the PPG signal according to any one of claims 2-5, wherein, the method further includes: Performing a verification operation on the optimal PPG signal acquisition position according to the user information of the wearable user of the wearable acquisition device, the comprehensive physiological structure state information of the wearing position where the wearable user wears the wearable acquisition device, and the pre-trained acquisition position positioning model, and obtaining a verification result; Judging whether the verification result indicates that the verification of the optimal PPG signal acquisition position is passed. When it is judged that the verification result indicates that the verification of the optimal PPG signal acquisition position is passed, determine the optimal PPG signal acquisition position as the actual acquisition position of the PPG signal for the wearable user; When the verification result indicates that the verification of the optimal PPG signal acquisition position fails, perform an optimal acquisition position positioning operation on the wearing position according to the user information of the wearable user of the wearable acquisition device, the comprehensive physiological structure state information of the wearing position where the wearable user wears the wearable acquisition device, and the pre-trained acquisition position positioning model, and obtain an optimal acquisition position positioning result; Determine the acquisition position in the optimal acquisition position positioning result as the new optimal PPG signal acquisition position; or, When the verification result indicates that the verification of the optimal PPG signal acquisition position fails, perform a correction operation on the optimal PPG signal acquisition position based on the extended acquisition position, and obtain a new optimal PPG signal acquisition position.

7. A device for determining the acquisition position of a PPG signal, wherein, the device is applied to a wearable acquisition device, and a plurality of acquisition sensors are arranged on the wearable acquisition device. After the user wears the wearable acquisition device, the acquisition sensors are used to perform signal acquisition operations; the device includes: A signal acquisition module, configured to acquire the PPG signals acquired by each target acquisition sensor, where the target acquisition sensor is an acquisition sensor in a working state among all the acquisition sensors; A determination module, configured to determine, from all the target acquisition sensors, a plurality of first acquisition sensors that need to perform signal quality analysis; A signal quality analysis module, configured to perform a time-domain analysis operation on the PPG signal acquired by each first acquisition sensor to obtain a time-domain analysis result of the PPG signal corresponding to the first acquisition sensor, and perform a frequency-domain analysis operation on the PPG signal acquired by the first acquisition sensor to obtain a frequency-domain analysis result of the PPG signal corresponding to the first acquisition sensor; and calculate the signal acquisition quality of the first acquisition sensor at the corresponding acquisition position according to the time-domain analysis result of the PPG signal corresponding to the first acquisition sensor and the frequency-domain analysis result of the PPG signal corresponding to the first acquisition sensor. A screening module, configured to screen, according to the signal acquisition quality of all the first acquisition sensors at corresponding acquisition positions, one acquisition sensor that meets a preset signal acquisition quality condition from all the first acquisition sensors, and determine the acquisition position where the screened one acquisition sensor is located as the optimal PPG signal acquisition position; Wherein, the specific manner for the determination module to determine, from all the target acquisition sensors, multiple first acquisition sensors that need to perform signal quality analysis includes: Determine the waveform parameters of the PPG signals acquired by each of the target acquisition sensors; According to the waveform parameters of the PPG signals acquired by all the target acquisition sensors, screen all the acquisition sensors whose waveform parameters of the acquired PPG signals meet the preset waveform parameter conditions from all the target acquisition sensors, and use them as multiple first acquisition sensors that need to perform signal quality analysis.

8. An apparatus for determining an acquisition position of a PPG signal Characterized in that The apparatus is applied to a wearable acquisition device, and a plurality of acquisition sensors are arranged on the wearable acquisition device. After the user wears the wearable acquisition device, the acquisition sensors are used to perform signal acquisition operations; the apparatus includes: A memory storing executable program code; A processor coupled to the memory; The processor calls the executable program code stored in the memory and executes the method for determining an acquisition position of a PPG signal according to any one of claims 1-6.

9. A computer-readable storage medium Characterized in that The computer-readable storage medium stores computer instructions, and when the computer instructions are called, they are used to execute the method for determining an acquisition position of a PPG signal according to any one of claims 1-6.

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