CN116616721B - Work and rest information determining method and device based on PPG (program G) signal and wearable equipment - Google Patents
Work and rest information determining method and device based on PPG (program G) signal and wearable equipment Download PDFInfo
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Abstract
The application discloses a work and rest information determining method and device based on a PPG signal and wearable equipment, wherein the method comprises the following steps: calculating to obtain first PPG signal quality data or second PPG signal quality data corresponding to each characteristic window; determining an alternative sleeping time interval from each preset time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval, and determining a sleeping time point of the target object based on the distribution state of the first PPG signal quality data in the alternative sleeping time interval; or, determining an alternative getting-up time interval from each preset time interval based on the first PPG signal quality data in the preset time interval, and determining the getting-up time point of the target object based on the distribution state of the first PPG signal quality data in the alternative getting-up time interval. The method is more sensitive and accurate in judging the sleeping/getting-up time.
Description
Technical Field
The application relates to the technical field of health monitoring, in particular to a work and rest information determining method based on a PPG signal. The application also relates to a work and rest information determining device based on the PPG signal and wearable equipment.
Background
Conventional sleep and wake-up recognition algorithms often use accelerometer (acclerometer, abbreviated to acc) and gyroscope (gyroscillope, abbreviated to gyro) data, and the principle is as follows: when the user is in a sleeping state, the body of the user usually keeps relatively static, whether the body of the user moves or not can be determined by detecting vibration in the acc, gyro and other data, and if the body of the user is in a relatively static state, the user can be inferred that the user is sleeping; when a person wakes up, the body of the person will often move greatly, and by analyzing the vibration and change in the acc and gyro data, it can be inferred whether the user is awake.
However, the above manner has the following drawbacks:
accelerometer or gyroscope can cause misjudgment of falling asleep and getting up time judgment due to mechanical noise and data drift problems of sensors.
Disclosure of Invention
The invention provides a work and rest information determining method and device based on a PPG signal and wearable equipment, and aims to solve the problem that in the prior art, due to the fact that mechanical noise and data drift of a sensor of an accelerometer or a gyroscope cause misjudgment on sleeping and getting-up time judgment.
In order to solve or improve the above technical problems to a certain extent, according to an aspect of the present invention, there is provided a work and rest information determining method based on PPG signals, including:
Sliding window is carried out on the PPG signal quality of a target object based on a preset characteristic window, and first PPG signal quality data or second PPG signal quality data corresponding to each characteristic window is obtained through calculation, wherein the first PPG signal quality data represents that the PPG signal quality is higher than a preset quality threshold value, and the second PPG signal quality data represents that the PPG signal quality is lower than the preset quality threshold value;
determining an alternative sleep time interval from each preset time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval, and determining a sleep time point of the target object based on the distribution state of the first PPG signal quality data or the distribution state of the second PPG signal quality data in the alternative sleep time interval;
or determining an alternative getting-up time interval from each preset time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval, and determining the getting-up time point of the target object based on the distribution state of the first PPG signal quality data or the distribution state of the second PPG signal quality data in the alternative getting-up time interval.
In some embodiments, the determining the alternative sleep time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval includes: and determining the first time interval as an alternative sleep time interval in response to the proportion of the first PPG signal quality data in a first time interval in each preset time interval being higher than a first threshold or the proportion of the second PPG signal quality data in the first time interval being lower than a second threshold, wherein the first threshold is not smaller than the second threshold.
In some embodiments, the determining a point in time of falling asleep of the target subject based on the distribution state of the first PPG signal quality data in the alternative falling asleep time interval comprises: determining a point in time at which the first PPG signal quality data starts to be steadily distributed in the alternative sleep-on time interval as a sleep-on time point of the target subject; or, in response to the first PPG signal quality data remaining steadily distributed from the starting position of the alternative sleep-on time interval, determining a point in time at which the first PPG signal quality data starts steadily distributed in the last time interval of the alternative sleep-on time interval as a sleep-on time point of the target subject.
In some embodiments, the determining a point in time of falling asleep of the target subject based on the distribution state of the second PPG signal quality data in the alternative falling asleep time interval comprises:
determining a starting point in time of the continuous zero distribution of the second PPG signal quality data in the alternative sleep onset time interval as a sleep onset time point of the target subject; alternatively, in response to the second PPG signal quality data maintaining a zero distribution from a starting position of the alternative sleep-on time interval, a starting point in time of the second PPG signal quality data continuing zero distribution in a previous time interval of the alternative sleep-on time interval is determined as a sleep-on time point of the target subject.
In some embodiments, the determining, based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time intervals, an alternative get-up time interval from each preset time interval includes:
and determining the second time interval as an alternative getting-up time interval in response to the proportion of the first PPG signal quality data in the second time interval being lower than a third threshold or the proportion of the second PPG signal quality data being higher than a fourth threshold, wherein the third threshold is not greater than the fourth threshold.
In some embodiments, the determining a time point of getting up of the target subject based on a distribution state of the first PPG signal quality data in the alternative time interval of getting up comprises:
determining a point in time at which the first PPG signal quality data starts to be discretely distributed in the alternative getting-up time interval as a getting-up time point of the target subject; alternatively, in response to the first PPG signal quality data remaining discretely distributed from a starting position of the alternative get-up time interval, a point in time at which the first PPG signal quality data starts discretely distributed in a previous time interval of the alternative fall-asleep time interval is determined as a get-up time point of the target subject.
In some embodiments, the determining a time point of getting up of the target subject based on a distribution state of the second PPG signal quality data in the alternative time interval of getting up comprises:
determining a point in time in the alternative get-up time interval at which the second PPG signal quality data starts to appear as a get-up time point of the target subject; or, in response to the starting position of the alternative get-up time interval being the second PPG signal quality data, determining a point in time at which the second PPG signal quality data starts to appear in a previous time interval of the alternative get-up time interval as a get-up time point of the target subject.
In some embodiments, the determining, based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time intervals, an alternative sleep-in time interval from each preset time interval includes:
and determining the first time interval as an alternative sleep time interval in response to the proportion of the first PPG signal quality data in the first time interval in each preset time interval being higher than a fifth threshold, or the proportion of the second PPG signal quality data in the first time interval being lower than a sixth threshold, and the average heart rate in the first time interval being lower than a preset heart rate, wherein the fifth threshold is not smaller than the sixth threshold.
According to another aspect of the present invention, there is provided a work and rest information determining apparatus based on a PPG signal, the apparatus comprising:
the signal quality obtaining unit is used for sliding window the PPG signal quality of the target object based on a preset characteristic window, calculating and obtaining first PPG signal quality data or second PPG signal quality data corresponding to each characteristic window, wherein the first PPG signal quality data represents PPG signal quality higher than a preset quality threshold, and the second PPG signal quality data represents PPG signal quality lower than the preset quality threshold;
A sleep time point determining unit, configured to determine an alternative sleep time interval from each preset time interval based on a proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval, and determine a sleep time point of the target object based on a distribution state of the first PPG signal quality data or a distribution state of the second PPG signal quality data in the alternative sleep time interval;
and the get-up time point determining unit is used for determining an alternative get-up time interval from each preset time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval, and determining the get-up time point of the target object based on the distribution state of the first PPG signal quality data or the distribution state of the second PPG signal quality data in the alternative get-up time interval.
According to another aspect of the invention, a wearable device is provided, which may perform the method as described above.
Compared with the prior art, the invention has the following advantages:
the invention provides a work and rest information determining method based on a PPG signal, which comprises the following steps: acquiring the PPG signal quality of a target object based on a preset characteristic window to obtain first PPG signal quality data or second PPG signal quality data corresponding to each acquisition period, wherein the first PPG signal quality data represents that the acquired PPG signal quality is higher than a preset quality threshold, and the second PPG signal quality data represents that the acquired PPG signal quality is lower than the preset quality threshold; determining an alternative sleep time interval from each preset time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval, and determining a sleep time point of a target object based on the distribution state of the first PPG signal quality data or the distribution state of the second PPG signal quality data in the alternative sleep time interval; or determining an alternative getting-up time interval from each preset time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval, and determining the getting-up time point of the target object based on the distribution state of the first PPG signal quality data or the distribution state of the second PPG signal quality data in the alternative getting-up time interval. According to the method, the characteristic that the PPG signal quality has poor motion disturbance resistance (namely, the PPG original data waveform is very easy to destroy in the activity state of a user) is utilized, the alternative sleeping time interval and the alternative getting-up time interval are determined according to the proportion of the PPG signal quality, and the sleeping and getting-up time of the user is accurately identified based on the distribution state of the PPG signal quality data.
Drawings
Fig. 1 is a flowchart of a method for determining information of interest based on PPG signals according to an embodiment of the present application;
fig. 2 is a block diagram of a unit of a rest information determining device based on PPG signals according to an embodiment of the present application;
fig. 3 is a schematic logic structure diagram of a wearable device according to an embodiment of the present application.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than those herein described, and those skilled in the art will readily appreciate that the present application may be similarly embodied without departing from the spirit or essential characteristics thereof, and therefore the present application is not limited to the specific embodiments disclosed below.
Aiming at a sleep detection scene of a user, in order to improve the judgment sensitivity and accuracy of sleeping/getting-up time, the application provides a work and rest information determining method based on a PPG signal, a work and rest information determining device based on the PPG signal and wearable equipment corresponding to the method. The following provides examples to describe the above methods, apparatuses, and wearable devices in detail.
The first embodiment of the application provides a work and rest information determining method based on a PPG signal, an application body of the method can be a computing device application for determining user work and rest information, and the computing device application can be operated on an intelligent wearable device or a network platform server for determining user work and rest information. Fig. 1 is a flowchart of a method for determining information of interest based on PPG signals according to a first embodiment of the present application, and the method provided in this embodiment is described in detail below with reference to fig. 1. The embodiments referred to in the following description are intended to illustrate the method principles and not to limit the practical use.
As shown in fig. 1, the work and rest information determining method based on PPG signals provided in this embodiment includes the following steps:
s101, sliding window is carried out on the PPG signal quality of a target object based on a preset characteristic window, and first PPG signal quality data or second PPG signal quality data corresponding to each characteristic window are obtained through calculation.
The method comprises the steps of carrying out sliding window on the PPG signal quality of a target object according to preset characteristic windows, and calculating to obtain first PPG signal quality data or second PPG signal quality data corresponding to each characteristic window, wherein the first PPG signal quality data represents that the PPG signal quality is higher than a preset quality threshold, and the second PPG signal quality data represents that the PPG signal quality is lower than the preset quality threshold. In this embodiment, the PPG signal quality of the target object is windowed with a window width of a predetermined time length, the PPG signal quality data in each feature window is calculated, when the PPG signal quality of a certain feature window is higher than a preset quality threshold, the PPG signal quality data is identified as first PPG signal quality data, and when the PPG signal quality of a certain feature window is lower than a preset quality threshold, the PPG signal quality data is identified as second PPG signal quality data. The PPG signal (photoplethysmogram) is similar to the ECG signal, can be obtained by a non-invasive means (such as measurement by a finger), can reflect the abundant microcirculation physiological information of a human body, has the unique physiological characteristics of the human body, is difficult to copy and imitate, and has higher safety. The quality of the PPG signal is obtained through calculation, the stability of the PPG signal is represented, the stability of the PPG signal is poor in a user awake state, and the stability of the PPG signal is good in a user sleep state or a resting state. In this embodiment, the PPG signal quality may be the proportion of the normal waveform with a smooth rule in the original waveform diagram corresponding to the window width (e.g. 1 minute) of the preset feature window. PPG photoplethysmography is a non-invasive method for measuring blood volume changes of a tissue micro-vascular bed, which is generally used for measuring heart rate and blood oxygen level, but has poor anti-motion disturbance capability due to its measurement principle being continuous blood volume changes, i.e. when the user is in a motion state, the corresponding PPG signal quality is poor, and when the user is in a rest state, the corresponding PPG signal quality is better, so that by utilizing the characteristic of poor anti-motion disturbance capability of the PPG signal quality, the user can be effectively distinguished from being in a rest state or an active state by identifying the PPG signal quality.
S102, determining an alternative sleep time interval from each preset time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval, and determining a sleep time point of a target object based on the distribution state of the first PPG signal quality data or the distribution state of the second PPG signal quality data in the alternative sleep time interval; or determining an alternative getting-up time interval from each preset time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval, and determining the getting-up time point of the target object based on the distribution state of the first PPG signal quality data or the distribution state of the second PPG signal quality data in the alternative getting-up time interval.
After the first PPG signal quality data or the second PPG signal quality data corresponding to each characteristic window are obtained through calculation in the step, the step is used for calculating the proportion of the first PPG signal quality data or the second PPG signal quality data in a preset time interval, determining an alternative sleeping time interval from each preset time interval based on the proportion, and then determining a sleeping time point of the target object based on the distribution state of the first PPG signal quality data or the distribution state of the second PPG signal quality data in the alternative sleeping time interval, wherein the alternative sleeping time interval refers to a time interval in which the target object is at least partially in a sleeping state and possibly comprises the sleeping time point of the target object, and after the alternative sleeping time interval is determined, further determining the sleeping time point of the target object based on the distribution state of the first PPG signal quality data or the distribution state of the second PPG signal quality data. Or determining an alternative getting-up time interval from each preset time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval, and determining the getting-up time point of the target object based on the distribution state of the first PPG signal quality data or the distribution state of the second PPG signal quality data in the alternative getting-up time interval, wherein the alternative getting-up time interval is a time interval in which the target object is at least partially not in a sleep state and possibly contains the getting-up time point of the target object, and after determining the alternative getting-up time interval, further determining the getting-up time point of the target object based on the distribution state of the first PPG signal quality data or the distribution state of the second PPG signal quality data.
In this embodiment, the determining, based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time intervals, the alternative sleep time interval from each preset time interval may refer to: and determining the first time interval as an alternative sleep time interval in response to the proportion of the first PPG signal quality data in the first time interval in each preset time interval being higher than a first threshold or the proportion of the second PPG signal quality data in the second time interval being lower than a second threshold, wherein the first threshold is not smaller than the second threshold.
The determining the sleeping time point of the target object based on the distribution state of the first PPG signal quality data in the alternative sleeping time interval may refer to: determining a time point at which the first PPG signal quality data starts to be stably distributed in the alternative sleep time interval as a sleep time point of the target object, for example, the first PPG signal quality and the second PPG signal quality are distributed in a cross manner or a random manner in an initial part interval of the alternative sleep time interval, if the target object is not in a sleep state in the initial part interval, and when the initial part interval is finished (i.e., the first PPG signal quality data starts to be stably distributed), the time point is the sleep time point of the target object; or in response to the first PPG signal quality data remaining stably distributed from the start position of the alternative sleep time interval, determining a time point at which the first PPG signal quality data starts to be stably distributed in the last time interval of the alternative sleep time interval as a sleep time point of the target object, that is, when the target object is in a resting state from the start position of the alternative sleep time interval, indicating that the sleep time point of the target object is not in the alternative sleep time interval, and taking the time point at which the target object starts to be in the resting state in the last time interval as the sleep time point.
The determining the sleeping time point of the target object based on the distribution state of the second PPG signal quality data in the alternative sleeping time interval may refer to: determining a starting time point of the continuous zero distribution of the second PPG signal quality data in the alternative sleep time interval as a sleep time point of the target object; alternatively, in response to the second PPG signal quality data maintaining a zero distribution from a starting position of the alternative fall asleep time interval, a starting time point in the last time interval of the alternative fall asleep time interval at which the second PPG signal quality data continues the zero distribution is determined as the fall asleep time point of the target subject.
The determining the alternative getting-up time interval from each preset time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval may refer to: and determining the second time interval as an alternative getting-up time interval in response to the proportion of the first PPG signal quality data in the second time interval in each preset time interval being lower than a third threshold or the proportion of the second PPG signal quality data being higher than a fourth threshold, wherein the third threshold is not greater than the fourth threshold.
The determining the time point of getting up of the target object based on the distribution state of the first PPG signal quality data in the alternative getting up time interval may refer to: determining a time point of the alternative getting-up time interval, at which the first PPG signal quality data starts to be discretely distributed, as a getting-up time point of the target object; alternatively, in response to the first PPG signal quality data remaining discretely distributed from the starting position of the alternative bedtime interval, a point in time at which the first PPG signal quality data starts discretely distributed in the last time interval of the alternative bedtime interval is determined as a start time point of the target subject.
The determining the time point of getting up of the target object based on the distribution state of the second PPG signal quality data in the alternative getting up time interval may refer to: determining a point in time at which the second PPG signal quality data starts to appear in the alternative getting-up time interval as a getting-up time point of the target subject; or, in response to the starting position of the alternative get-up time interval being the second PPG signal quality data, determining a point in time at which the second PPG signal quality data starts to appear in the previous time interval of the alternative get-up time interval as a get-up time point of the target subject.
It should be noted that, based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time intervals, the determining the alternative sleep time interval from each preset time interval may also refer to: and determining the first time interval as an alternative sleep time interval in response to the proportion of the first PPG signal quality data in the first time interval in each preset time interval being higher than a fifth threshold value or the proportion of the second PPG signal quality data in the first time interval being lower than a sixth threshold value, wherein the fifth threshold value is not lower than the sixth threshold value, and the fifth threshold value is lower than the first threshold value. That is, in addition to determining the alternative sleep time interval by comparing the proportion of the first PPG signal quality data to the first threshold as described above, the alternative sleep time interval may be determined by comparing the proportion of the first PPG signal quality data to a smaller threshold (fifth threshold) in combination with a preset heart rate.
According to the work and rest information determining method based on the PPG signals, firstly, the PPG signal quality of a target object is collected based on a preset characteristic window, first PPG signal quality data or second PPG signal quality data corresponding to each collection period are obtained, the first PPG signal quality data represent the collected PPG signal quality to be higher than a preset quality threshold, and the second PPG signal quality data represent the collected PPG signal quality to be lower than the preset quality threshold; secondly, determining an alternative sleeping time interval from each preset time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval, and determining a sleeping time point of a target object based on the distribution state of the first PPG signal quality data or the distribution state of the second PPG signal quality data in the alternative sleeping time interval; or determining an alternative getting-up time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval, and determining the getting-up time point of the target object based on the distribution state of the first PPG signal quality data or the distribution state of the second PPG signal quality data in the alternative getting-up time interval. According to the method, the characteristic that the PPG signal quality has poor motion disturbance resistance (namely, the PPG original data waveform is very easy to destroy in the activity state of a user) is utilized, the alternative sleep time interval is determined according to the proportion of the PPG signal quality, and the sleep time and the get-up time of the user are identified based on the distribution state of the PPG signal quality data.
The above-mentioned embodiments provide a method for determining information of interest based on PPG signals, and correspondingly, another embodiment of the present application further provides a device for determining information of interest based on PPG signals, and since the device embodiments are substantially similar to the method embodiments, the description is relatively simple, and the details of the relevant technical features should be referred to the corresponding descriptions of the method embodiments provided above, and the following descriptions of the device embodiments are merely illustrative.
Referring to fig. 2 for understanding the embodiment, fig. 2 is a block diagram of a unit of a device for determining information of interest based on PPG signals provided in the embodiment, and as shown in fig. 2, the device provided in the embodiment includes:
a signal quality obtaining unit 201, configured to perform sliding window on a PPG signal quality of a target object based on a preset feature window, calculate and obtain first PPG signal quality data or second PPG signal quality data corresponding to each feature window, where the first PPG signal quality data represents PPG signal quality higher than a preset quality threshold, and the second PPG signal quality data represents PPG signal quality lower than the preset quality threshold;
a sleep time point determining unit 202, configured to determine an alternative sleep time interval from each preset time interval based on a proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval, and determine a sleep time point of the target object based on a distribution state of the first PPG signal quality data or a distribution state of the second PPG signal quality data in the alternative sleep time interval;
A get-up time point determining unit 203, configured to determine an alternative get-up time interval from each preset time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval, and determine a get-up time point of the target object based on a distribution state of the first PPG signal quality data or a distribution state of the second PPG signal quality data in the alternative get-up time interval.
In some embodiments, the determining, based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time intervals, an alternative sleep-in time interval from each preset time interval includes: and determining the first time interval as an alternative sleep time interval in response to the proportion of the first PPG signal quality data in a first time interval in each preset time interval being higher than a first threshold or the proportion of the second PPG signal quality data in the first time interval being lower than a second threshold, wherein the first threshold is not smaller than the second threshold.
In some embodiments, the determining a point in time of falling asleep of the target subject based on the distribution state of the first PPG signal quality data in the alternative falling asleep time interval comprises: determining a point in time at which the first PPG signal quality data starts to be steadily distributed in the alternative sleep-on time interval as a sleep-on time point of the target subject; or, in response to the first PPG signal quality data remaining steadily distributed from the starting position of the alternative sleep-on time interval, determining a point in time at which the first PPG signal quality data starts steadily distributed in the last time interval of the alternative sleep-on time interval as a sleep-on time point of the target subject.
In some embodiments, the determining a point in time of falling asleep of the target subject based on the distribution state of the second PPG signal quality data in the alternative falling asleep time interval comprises:
determining a starting point in time of the continuous zero distribution of the second PPG signal quality data in the alternative sleep onset time interval as a sleep onset time point of the target subject; alternatively, in response to the second PPG signal quality data maintaining a zero distribution from a starting position of the alternative sleep-on time interval, a starting point in time of the second PPG signal quality data continuing zero distribution in a previous time interval of the alternative sleep-on time interval is determined as a sleep-on time point of the target subject.
In some embodiments, the determining, based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time intervals, an alternative get-up time interval from each preset time interval includes:
and determining the second time interval as an alternative getting-up time interval in response to the proportion of the first PPG signal quality data in the second time interval being lower than a third threshold or the proportion of the second PPG signal quality data being higher than a fourth threshold, wherein the third threshold is not greater than the fourth threshold.
In some embodiments, the determining a time point of getting up of the target subject based on a distribution state of the first PPG signal quality data in the alternative time interval of getting up comprises:
determining a point in time at which the first PPG signal quality data starts to be discretely distributed in the alternative getting-up time interval as a getting-up time point of the target subject; alternatively, in response to the first PPG signal quality data remaining discretely distributed from a starting position of the alternative get-up time interval, a point in time at which the first PPG signal quality data starts discretely distributed in a previous time interval of the alternative fall-asleep time interval is determined as a get-up time point of the target subject.
In some embodiments, the determining a time point of getting up of the target subject based on a distribution state of the second PPG signal quality data in the alternative time interval of getting up comprises:
determining a point in time in the alternative get-up time interval at which the second PPG signal quality data starts to appear as a get-up time point of the target subject; or, in response to the starting position of the alternative get-up time interval being the second PPG signal quality data, determining a point in time at which the second PPG signal quality data starts to appear in a previous time interval of the alternative get-up time interval as a get-up time point of the target subject.
In some embodiments, the determining, based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time intervals, an alternative sleep-in time interval from each preset time interval includes:
and determining the first time interval as an alternative sleep time interval in response to the proportion of the first PPG signal quality data in the first time interval in each preset time interval being higher than a fifth threshold, or the proportion of the second PPG signal quality data in the first time interval being lower than a sixth threshold, and the average heart rate in the first time interval being lower than a preset heart rate, wherein the fifth threshold is not smaller than the sixth threshold.
According to the work and rest information determining device based on the PPG signal, provided by the embodiment of the application, by utilizing the principle that the waveform of the PPG original data is very easy to destroy in the activity state of a user, the alternative sleep time interval is determined according to the proportion of the PPG signal quality, and the sleep time and the get-up time of the user are identified based on the distribution state of the PPG signal quality data.
In the above-mentioned embodiments, a method for determining information of interest based on PPG signals and a device for determining information of interest based on PPG signals are provided, and in addition, another embodiment of the present application further provides a wearable device, which may perform the method for determining information of interest based on PPG signals as shown above, or perform the device for determining information of interest based on PPG signals as shown above, and since the device embodiments are substantially similar to the method embodiments, the description is relatively simple, and the details of the relevant technical features should be found in the corresponding descriptions of the method embodiments provided above, and the description of the wearable device embodiments below is merely illustrative. The wearable device embodiment is as follows:
fig. 3 is a schematic diagram of the wearable device provided in the present embodiment.
As shown in fig. 3, the wearable device provided in this embodiment includes: a processor 301 and a memory 302;
the memory 302 is used to store computer instructions for data processing which, when read and executed by the processor 301, perform the following operations:
sliding window is carried out on the PPG signal quality of a target object based on a preset characteristic window, and first PPG signal quality data or second PPG signal quality data corresponding to each characteristic window is obtained through calculation, wherein the first PPG signal quality data represents that the PPG signal quality is higher than a preset quality threshold value, and the second PPG signal quality data represents that the PPG signal quality is lower than the preset quality threshold value;
Determining an alternative sleep time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in a preset time interval, and determining a sleep time point of the target object based on the distribution state of the first PPG signal quality data or the distribution state of the second PPG signal quality data in the alternative sleep time interval;
or determining an alternative getting-up time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in a preset time interval, and determining the getting-up time point of the target object based on the distribution state of the first PPG signal quality data or the distribution state of the second PPG signal quality data in the alternative getting-up time interval.
In some embodiments, the determining the alternative sleep time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval includes: and determining the first time interval as an alternative sleep time interval in response to the proportion of the first PPG signal quality data in a first time interval in each preset time interval being higher than a first threshold or the proportion of the second PPG signal quality data in the first time interval being lower than a second threshold, wherein the first threshold is not smaller than the second threshold.
In some embodiments, the determining a point in time of falling asleep of the target subject based on the distribution state of the first PPG signal quality data in the alternative falling asleep time interval comprises: determining a point in time at which the first PPG signal quality data starts to be steadily distributed in the alternative sleep-on time interval as a sleep-on time point of the target subject; or, in response to the first PPG signal quality data remaining steadily distributed from the starting position of the alternative sleep-on time interval, determining a point in time at which the first PPG signal quality data starts steadily distributed in the last time interval of the alternative sleep-on time interval as a sleep-on time point of the target subject.
In some embodiments, the determining a point in time of falling asleep of the target subject based on the distribution state of the second PPG signal quality data in the alternative falling asleep time interval comprises:
determining a starting point in time of the continuous zero distribution of the second PPG signal quality data in the alternative sleep onset time interval as a sleep onset time point of the target subject; alternatively, in response to the second PPG signal quality data maintaining a zero distribution from a starting position of the alternative sleep-on time interval, a starting point in time of the second PPG signal quality data continuing zero distribution in a previous time interval of the alternative sleep-on time interval is determined as a sleep-on time point of the target subject.
In some embodiments, the determining the alternative get-up time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval includes:
and determining the second time interval as an alternative getting-up time interval in response to the proportion of the first PPG signal quality data in the second time interval being lower than a third threshold or the proportion of the second PPG signal quality data being higher than a fourth threshold, wherein the third threshold is not greater than the fourth threshold.
In some embodiments, the determining a time point of getting up of the target subject based on a distribution state of the first PPG signal quality data in the alternative time interval of getting up comprises:
determining a point in time at which the first PPG signal quality data starts to be discretely distributed in the alternative getting-up time interval as a getting-up time point of the target subject; alternatively, in response to the first PPG signal quality data remaining discretely distributed from a starting position of the alternative get-up time interval, a point in time at which the first PPG signal quality data starts discretely distributed in a previous time interval of the alternative fall-asleep time interval is determined as a get-up time point of the target subject.
In some embodiments, the determining a time point of getting up of the target subject based on a distribution state of the second PPG signal quality data in the alternative time interval of getting up comprises:
determining a point in time in the alternative get-up time interval at which the second PPG signal quality data starts to appear as a get-up time point of the target subject; or, in response to the starting position of the alternative get-up time interval being the second PPG signal quality data, determining a point in time at which the second PPG signal quality data starts to appear in a previous time interval of the alternative get-up time interval as a get-up time point of the target subject.
In some embodiments, the determining the alternative sleep time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval includes:
and determining the first time interval as an alternative sleep time interval in response to the proportion of the first PPG signal quality data in the first time interval in each preset time interval being higher than a fifth threshold, or the proportion of the second PPG signal quality data in the first time interval being lower than a sixth threshold, and the average heart rate in the first time interval being lower than a preset heart rate, wherein the fifth threshold is not smaller than the sixth threshold.
By using the wearable device provided by the embodiment, the alternative sleep time interval is determined by utilizing the principle that the PPG original data waveform is very easy to be destroyed under the activity state of the user, and the sleep time and the get-up time of the user are identified based on the distribution state of the PPG signal quality data.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.
1. Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer readable media, as defined herein, does not include non-transitory computer readable media (transmission media), such as modulated data signals and carrier waves.
2. It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
While the application has been described in terms of preferred embodiments, it is not intended to be limiting, but rather, it will be apparent to those skilled in the art that various changes and modifications can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (10)
1. A method for determining information of work and rest based on PPG signals, comprising:
sliding window is carried out on the PPG signal quality of a target object based on a preset characteristic window, and first PPG signal quality data or second PPG signal quality data corresponding to each characteristic window is obtained through calculation, wherein the first PPG signal quality data represents that the PPG signal quality is higher than a preset quality threshold value, and the second PPG signal quality data represents that the PPG signal quality is lower than the preset quality threshold value;
Determining an alternative sleep time interval from each preset time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval, and determining a sleep time point of the target object based on the distribution state of the first PPG signal quality data or the distribution state of the second PPG signal quality data in the alternative sleep time interval;
or determining an alternative getting-up time interval from each preset time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval, and determining the getting-up time point of the target object based on the distribution state of the first PPG signal quality data or the distribution state of the second PPG signal quality data in the alternative getting-up time interval.
2. The method of claim 1, wherein the determining an alternative sleep-in time interval from each of the preset time intervals based on the proportion of the first PPG signal quality data or the second PPG signal quality data within the preset time interval comprises: and determining the first time interval as an alternative sleep time interval in response to the proportion of the first PPG signal quality data in a first time interval in each preset time interval being higher than a first threshold or the proportion of the second PPG signal quality data in the first time interval being lower than a second threshold, wherein the first threshold is not smaller than the second threshold.
3. The method of claim 1, wherein the determining a point in time of falling asleep of the target subject based on a distribution state of the first PPG signal quality data in the alternative falling asleep time interval comprises: determining a point in time at which the first PPG signal quality data starts to be steadily distributed in the alternative sleep-on time interval as a sleep-on time point of the target subject; or, in response to the first PPG signal quality data remaining steadily distributed from the starting position of the alternative sleep-on time interval, determining a point in time at which the first PPG signal quality data starts steadily distributed in the last time interval of the alternative sleep-on time interval as a sleep-on time point of the target subject.
4. The method of claim 1, wherein the determining a point in time of falling asleep of the target subject based on a distribution state of the second PPG signal quality data in the alternative falling asleep time interval comprises:
determining a starting point in time of the continuous zero distribution of the second PPG signal quality data in the alternative sleep onset time interval as a sleep onset time point of the target subject; alternatively, in response to the second PPG signal quality data maintaining a zero distribution from a starting position of the alternative sleep-on time interval, a starting point in time of the second PPG signal quality data continuing zero distribution in a previous time interval of the alternative sleep-on time interval is determined as a sleep-on time point of the target subject.
5. The method of claim 1, wherein the determining an alternative get-up time interval from each of the preset time intervals based on the proportion of the first PPG signal quality data or the second PPG signal quality data within the preset time interval comprises:
and determining the second time interval as an alternative getting-up time interval in response to the proportion of the first PPG signal quality data in the second time interval in each preset time interval being lower than a third threshold or the proportion of the second PPG signal quality data being higher than a fourth threshold, wherein the third threshold is not greater than the fourth threshold.
6. The method according to claim 1, wherein the determining the time point of getting up of the target object from each of the preset time intervals based on the distribution state of the first PPG signal quality data in the alternative time interval of getting up comprises:
determining a point in time at which the first PPG signal quality data starts to be discretely distributed in the alternative getting-up time interval as a getting-up time point of the target subject; alternatively, in response to the first PPG signal quality data remaining discretely distributed from a starting position of the alternative get-up time interval, a point in time at which the first PPG signal quality data starts discretely distributed in a previous time interval of the alternative fall-asleep time interval is determined as a get-up time point of the target subject.
7. The method of claim 1, wherein the determining the time point of getting up of the target subject based on the distribution state of the second PPG signal quality data in the alternative time interval of getting up comprises:
determining a point in time in the alternative get-up time interval at which the second PPG signal quality data starts to appear as a get-up time point of the target subject; or, in response to the starting position of the alternative get-up time interval being the second PPG signal quality data, determining a point in time at which the second PPG signal quality data starts to appear in a previous time interval of the alternative get-up time interval as a get-up time point of the target subject.
8. The method of claim 1, wherein the determining an alternative sleep-in time interval from each of the preset time intervals based on the proportion of the first PPG signal quality data or the second PPG signal quality data within the preset time interval comprises:
and determining the first time interval as an alternative sleep time interval in response to the proportion of the first PPG signal quality data in the first time interval in each preset time interval being higher than a fifth threshold, or the proportion of the second PPG signal quality data in the first time interval being lower than a sixth threshold, and the average heart rate in the first time interval being lower than a preset heart rate, wherein the fifth threshold is not smaller than the sixth threshold.
9. A work and rest information determining device based on PPG signals, the device comprising:
the signal quality obtaining unit is used for sliding window the PPG signal quality of the target object based on a preset characteristic window, calculating and obtaining first PPG signal quality data or second PPG signal quality data corresponding to each characteristic window, wherein the first PPG signal quality data represents PPG signal quality higher than a preset quality threshold, and the second PPG signal quality data represents PPG signal quality lower than the preset quality threshold;
a sleep time point determining unit, configured to determine an alternative sleep time interval from each preset time interval based on a proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval, and determine a sleep time point of the target object based on a distribution state of the first PPG signal quality data or a distribution state of the second PPG signal quality data in the alternative sleep time interval;
and the get-up time point determining unit is used for determining an alternative get-up time interval from each preset time interval based on the proportion of the first PPG signal quality data or the second PPG signal quality data in the preset time interval, and determining the get-up time point of the target object based on the distribution state of the first PPG signal quality data or the distribution state of the second PPG signal quality data in the alternative get-up time interval.
10. A wearable device, characterized in that the wearable device is executable to perform the method of any of claims 1-8.
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