KR102256287B1 - Apparatus and method for measuring a heart rate using photoplethysmography in a electronic device - Google Patents

Abstract

The heart rate processing method of the electronic device includes an operation of detecting a PPG signal, an operation of generating a first heart rate from the measured PPG signal, an operation of generating a second heart rate from the measured PPG signal, and the first heart rate. And an operation of determining an output heart rate by analyzing the second heart rate and an operation of displaying the output heart rate. Also, other embodiments are possible.

Description

Heart rate measuring device and method of electronic device {APPARATUS AND METHOD FOR MEASURING A HEART RATE USING PHOTOPLETHYSMOGRAPHY IN A ELECTRONIC DEVICE}

Various embodiments of the present disclosure relate to an apparatus and method capable of calculating and displaying a heart rate by measuring the amount of optical blood flow in an electronic device.

Electronic devices are equipped with various functions. For example, an electronic device can calculate a heart rate by measuring photoplethysmography (PPG). As the heart repeats contraction/relaxation, the blood flow in the peripheral blood vessels changes and the volume of the blood vessels changes. The optical blood flow test (hereinafter referred to as PPG) is a technique that shows the heartbeat in a waveform by measuring the transmission amount of light according to changes in blood vessels, and can be used to measure changes in blood volume or oxygen saturation in blood vessels.

In order to calculate the heart rate using the PPG, the amount of light received from the photodiode is measured, converted into an ADC, and then the heart rate (hereinafter referred to as HR) may be calculated. However, it may take some time for the device to stabilize when starting to measure heart rate. For example, in order to calculate the HR value, it may take time to remove noise caused by the inflow of ambient light mixed with the PPG signal detected by the sensor, and effects caused by motion of the device. Therefore, when the electronic device starts measuring heart rate, it is possible to output an incorrectly measured HR result value for a period of time during which a stable measurement result value can be processed.

Various embodiments of the present invention propose a method of providing appropriate HR output data by analyzing a PPG signal.

The heart rate processing method of an electronic device according to various embodiments of the present disclosure includes an operation of detecting a PPG signal, generating a first heart rate from the measured PPG signal, and generating a second heart rate from the measured PPG signal. And determining an output heart rate by analyzing the first heart rate and the second heart rate, and displaying the output heart rate.

A heart rate processing method of an electronic device according to various embodiments includes an operation of generating and outputting a first heart rate from a PPG signal at the start of heart rate measurement, detecting a movement of the device, and correcting the PPG signal according to the detected movement. Thereafter, generating a second heart rate from the corrected PPG signal, analyzing the first heart rate and the second heart rate, and determining the second heart rate as an output heart rate when the second heart rate is stable output, and And displaying the output heart rate.

An electronic device according to various embodiments includes an optical sensor detecting a PPG signal, a sensor unit detecting a device state, and generating a first heart rate and a second heart rate from the measured PPG signal, and generating the first heart rate and the second heart rate. 2 A control unit for determining an output heart rate by analyzing the heart rate, and a display unit for displaying the determined heart rate may be included.

The method and apparatus according to various embodiments of the present disclosure may provide a method of measuring HR using PPG. In the HR display method, the PPG signal measured from the sensor is displayed as an output HR until stable HR values are acquired, and when the stable HR values are acquired, a method of providing the corresponding value as an output is provided. It is possible to minimize the operation of displaying erroneous information that differs greatly from the actual value until the HR value of is displayed.

1 illustrates a network environment 100 including an electronic device 101 according to various embodiments.
2 is a diagram showing the configuration of an electronic device including a heart rate measurement module.
3A is a diagram illustrating an example of measuring PPG using an LED and a photodiode.
3B is a diagram illustrating calculation of a PPG signal and a PPI output from an optical sensor.
3C is a diagram for explaining a relationship between an actual heart rate and a measured heart rate when measuring heart rate in an electronic device
4 is a diagram illustrating a configuration of a control unit for measuring heart rate in an electronic device.
5A and 5B are diagrams for explaining a method of generating an initial heart rate HR1 in a first HR generation unit.
6 is a diagram illustrating a block diagram of an electronic device according to various embodiments.
7 is a flowchart illustrating a method of measuring a heart rate in an electronic device.
8 is a flowchart illustrating a method of calculating a heart rate using a PPG signal in an electronic device.
9 is a flowchart illustrating a method of calculating a heart rate using a PPG signal and a sensor in an electronic device.
10 is a flowchart illustrating an HR measurement procedure in an electronic device.
11 is a flowchart illustrating another example of an HR measurement procedure in an electronic device.

Hereinafter, various embodiments of the present invention will be described in connection with the accompanying drawings. Various embodiments of the present invention may be modified in various ways and may have various embodiments, and specific embodiments are illustrated in the drawings and related detailed descriptions are described. However, this is not intended to limit the various embodiments of the present invention to specific embodiments, it should be understood to include all changes and/or equivalents or substitutes included in the spirit and scope of the various embodiments of the present invention. In connection with the description of the drawings, similar reference numerals have been used for similar elements.

Expressions such as “include” or “may include” that may be used in various embodiments of the present invention indicate the existence of a corresponding function, operation, or component that has been disclosed, and an additional one or more functions, operations, or It does not limit the components, etc. In addition, in various embodiments of the present invention, terms such as "comprises" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, It is to be understood that it does not preclude the possibility of the presence or addition of one or more other features or numbers, steps, actions, components, parts, or combinations thereof.

In various embodiments of the present invention, expressions such as "or" include any and all combinations of words listed together. For example, "A or B" may include A, may include B, or may include both A and B.

Expressions such as “first,” “second,” “first,” or “second,” used in various embodiments of the present invention may modify various elements of various embodiments, but limit the corresponding elements. I never do that. For example, the expressions do not limit the order and/or importance of corresponding elements. The above expressions may be used to distinguish one component from another component. For example, a first user device and a second user device are both user devices and represent different user devices. For example, without departing from the scope of the rights of various embodiments of the present invention, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component.

When a component is referred to as being "connected" or "connected" to another component, the component is directly connected to or may be connected to the other component, but the component and It should be understood that new other components may exist between the other components. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it will be understood that no new other component exists between the component and the other component. Should be able to.

The terms used in various embodiments of the present invention are only used to describe specific embodiments, and are not intended to limit the various embodiments of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

Unless otherwise defined, all terms including technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless explicitly defined in various embodiments of the present invention, ideal or excessively formal It is not interpreted in meaning.

An electronic device according to various embodiments of the present disclosure may be a device including a heart rate measurement function. For example, electronic devices include smart phones, tablet personal computers (PCs), mobile phones, video phones, e-book readers, desktop personal computers (desktop personal computers), and laptops. Laptop personal computer (PC), netbook computer, personal digital assistant (PDA), portable multimedia player (PMP), MP3 player, mobile medical device, camera, or wearable device (e.g.: It may include at least one of a head-mounted-device (HMD) such as electronic glasses, an electronic clothing, an electronic bracelet, an electronic necklace, an electronic appcessory, an electronic tattoo, or a smart watch.

According to some embodiments, the electronic device may be a smart home appliance having a heart rate measurement function. Smart home appliances, for example, include televisions, digital video disk (DVD) players, audio, refrigerators, air conditioners, vacuum cleaners, ovens, microwave ovens, washing machines, air purifiers, set-top boxes, and TVs. It may include at least one of a box (eg, Samsung HomeSync™, Apple TV™, or Google TV™), game consoles, electronic dictionary, electronic key, camcorder, or electronic frame.

According to some embodiments, the electronic device includes various medical devices (eg, magnetic resonance angiography (MRA), magnetic resonance imaging (MRI), computed tomography (CT)), an imager, an ultrasound device, etc.), a navigation device, and a GPS receiver. (global positioning system receiver), EDR (event data recorder), FDR (flight data recorder), automobile infotainment device, marine electronic equipment (e.g. marine navigation equipment and gyro compass, etc.), avionics, It may include at least one of a security device, a vehicle head unit, an industrial or domestic robot, an automatic teller's machine (ATM) of a financial institution, or a point of sales (POS) of a store.

According to some embodiments, the electronic device is a piece of furniture or building/structure including a heart rate measurement function, an electronic board, an electronic signature receiving device, a projector, Alternatively, it may include at least one of various measuring devices (eg, water, electricity, gas, or radio wave measuring devices). An electronic device according to various embodiments of the present disclosure may be a combination of one or more of the aforementioned various devices. Also, an electronic device according to various embodiments of the present disclosure may be a flexible device. In addition, it is obvious to those skilled in the art that the electronic device according to various embodiments of the present disclosure is not limited to the above-described devices.

Hereinafter, electronic devices according to various embodiments will be described with reference to the accompanying drawings. The term user used in various embodiments may refer to a person using an electronic device or a device (eg, an artificial intelligence electronic device) using an electronic device.

1 illustrates a network environment 100 including an electronic device 101 according to various embodiments. Referring to FIG. 1, the electronic device 101 may include a bus 110, a processor 120, a memory 130, an input/output interface 140, a display 150, a communication interface 160, and a heart rate measurement module 170.

The bus 110 may be a circuit that connects the above-described components to each other and transmits communication (eg, a control message) between the above-described components.

The processor 120, for example, from the other components described above (eg, the memory 130, the input/output interface 140, the display 150, the communication interface 160, or the heart rate measurement module 170, etc.) through the bus 110 By receiving an instruction, it is possible to decrypt the received instruction, and perform an operation or data processing according to the decrypted instruction.

The memory 130 may be received from the processor 120 or other components (eg, the input/output interface 140, the display 150, the communication interface 160, or the heart rate measurement module 170), or to the processor 120 or other components. Can store commands or data generated by The memory 130 may include programming modules such as a kernel 131, a middleware 132, an application programming interface (API) 133 or an application 134, for example. Each of the above-described programming modules may be composed of software, firmware, hardware, or a combination of at least two or more of them.

The kernel 131 includes system resources (e.g., the bus 110, the processor 120) used to execute an operation or function implemented in the other programming modules, for example, the middleware 132, the API 133, or the application 134. Alternatively, the memory 130, etc.) may be controlled or managed. In addition, the kernel 131 may provide an interface through which the middleware 132, the API 133, or the application 134 can access and control or manage individual components of the electronic device 101.

The middleware 132 may serve as an intermediary so that the API 133 or the application 134 communicates with the kernel 131 to exchange data. In addition, the middleware 132 provides a system resource (eg, the bus 110, the processor 120, or the electronic device 101) to at least one application among the applications 134 in relation to the job requests received from the application 134. Control (eg, scheduling or load balancing) on a work request may be performed by using a method such as assigning a priority that can use the memory 130 or the like.

The API 133 is an interface for the application 134 to control functions provided by the kernel 131 or the middleware 132, for example, at least one interface or function for file control, window control, image processing or text control, etc. (Example: command) can be included.

According to various embodiments, the application 134 is an SMS/MMS application, an email application, a calendar application, an alarm application, a health care application (eg, an application that measures exercise amount or blood sugar), or an environmental information application (eg: An application that provides information on atmospheric pressure, humidity, or temperature), etc. may be included. Additionally or alternatively, the application 134 may be an application related to information exchange between the electronic device 101 and an external electronic device (eg, the electronic device 104). The application related to the information exchange may include, for example, a notification relay application for delivering specific information to the external electronic device, or a device management application for managing the external electronic device. I can.

For example, the notification delivery application transmits notification information generated from another application (eg, SMS/MMS application, email application, health management application, environment information application, etc.) of the electronic device 101 to an external electronic device (eg, electronic device 104). ) Can be included. Additionally or alternatively, the notification delivery application may receive notification information from an external electronic device (eg, electronic device 104) and provide it to a user. The device management application includes, for example, a function for at least a part of an external electronic device (eg, electronic device 104) communicating with the electronic device 101 (eg, turning on/on of the external electronic device itself (or some component parts)). Turn off or adjust the brightness (or resolution) of the display), manage applications running on the external electronic device or services (eg, call service or message service) provided by the external electronic device (eg, install, delete, or update) )can do.

According to various embodiments, the application 134 may include an application designated according to a property (eg, type of electronic device) of the external electronic device (eg, electronic device 104). For example, when the external electronic device is an MP3 player, the application 134 may include an application related to music playback. Similarly, when the external electronic device is a mobile medical device, the application 134 may include an application related to health management. According to an embodiment, the application 134 may include at least one of an application designated to the electronic device 101 or an application received from an external electronic device (eg, the server 106 or the electronic device 104).

The input/output interface 140 includes commands or data input from a user through an input/output device (eg, a sensor, a keyboard, or a touch screen), for example, the processor 120, the memory 130, and the communication interface 160 through the bus 110. Or it may be transmitted to the heart rate measurement module 170. For example, the input/output interface 140 may provide data on a user's touch input through a touch screen to the processor 120. In addition, the input/output interface 140 may transmit commands or data received from the processor 120, the memory 130, the communication interface 160, or the heart rate measurement module 170 through the bus 110 to the input/output device (eg: Speaker or display). For example, the input/output interface 140 may output voice data processed through the processor 120 to a user through a speaker.

The display 150 may display various types of information (eg, multimedia data or text data) to a user.

The communication interface 160 may connect communication between the electronic device 101 and an external device (eg, the electronic device 104 or the server 106). For example, the communication interface 160 may be connected to a network 162 through wireless communication or wired communication to communicate with the external device. The wireless communication is, for example, Wifi (wireless fidelity), BT (Bluetooth), NFC (near field communication), GPS (global positioning system) or cellular communication (e.g., LTE, LTE-A, CDMA, WCDMA, UMTS , WiBro or GSM, etc.). The wired communication may include, for example, at least one of a universal serial bus (USB), a high definition multimedia interface (HDMI), a recommended standard 232 (RS-232), or a plain old telephone service (POTS).

According to an embodiment, the network 162 may be a telecommunications network. The communication network may include at least one of a computer network, the Internet, the Internet of things, and a telephone network. According to an embodiment, a protocol for communication between the electronic device 101 and an external device (eg, transport layer protocol, data link layer protocol, or physical layer protocol) is an application 134, an application programming interface 133, the middleware 132, and a kernel 131. Alternatively, it may be supported by at least one of the communication interfaces 160.

2 is a diagram showing the configuration of an electronic device including a heart rate measurement module. The electronic device may include a control unit 200, a storage unit 210, an optical sensor 220, a sensor unit 230, a display unit 240, and an input unit 250.

Referring to FIG. 2, the optical sensor 220 includes a light emitting unit that generates light for measuring the amount of light blood flow, and a light receiving unit that receives light that changes according to the relaxation and contraction of blood vessels. The amount of light blood flow can be detected according to the light change accordingly. The sensor unit 230 may include sensors that detect movement of the device and sensors that detect brightness around the device. Here, the sensor for detecting the movement of the device may be a 3-axis acceleration sensor. In addition, when the electronic device is a wearable electronic device (for example, a watch type device), a sensor for detecting whether the electronic device is worn may be further included. In the following description, the optical sensor 220 will be used with the same meaning as the PPG sensor.

The control unit 200 generates a first heart rate from the optical blood flow amount measured by the optical sensor 220, corrects the optical blood flow amount output from the optical sensor 220 according to the movement of the device detected by the sensor unit 230, and then the corrected optical blood flow amount. The second heart rate can be generated from. In addition, the controller 200 may determine a heart rate by analyzing the first heart rate and the second heart rate, and control to display the determined heart rate.

The storage 210 may store programs and data for controlling the operation of the electronic device. In addition, the storage unit 210 may store heart rate values corresponding to the amount of light blood flow.

The display unit 240 may display a heart rate under the control of the controller 200. The input unit 250 may generate an operation command of the portable terminal and key data for communication. Here, the display unit 240 and the input unit 250 may be implemented as an integrated touch screen.

3A is a diagram showing an example of measuring PPG using an LED and a photodiode. The blood flow test (PPG: Photoplethysmography) uses light to measure the amount of blood in a blood vessel at a body part through an artery such as a fingertip. It can be a technique to measure change or oxygen saturation. For example, the volume of peripheral blood vessels that are changed while the heart repeats contraction and relaxation may be changed, and the optical sensor 220 may generate a PPG signal by detecting the amount of light transmitted according to the volume change of the blood vessel. The photosensor 220 may include a light emitting unit 310 generating light and a light receiving unit 315 receiving light. For example, the light emitting unit 310 may be a light emitting diode, and the light receiving unit 315 may be a photodiode. When the finger of the optical sensor 220 is positioned, the skin 320 surrounding the bone 325 may contact the optical sensor 220 as shown in FIG. 3A. In this case, the light emitted from the light emitting diode 310 of the photosensor 220 may be applied to the photodiode 315 through the skin 320, and the photodiode 315 may detect a change in the amount of light transmitted. For example, when the finger is in close contact with the part of the photosensor 220, light emitted from the light emitting diode 310 spreads and spreads widely as it passes through various media of the finger, and a part of the light can be detected through the photodiode 315. The optical sensor 220 is a transmissive method in which light emitted from the LED 310 passes through the body part 320 to be measured, and then detects a signal from the photodiode 315 on the opposite side, or the body part to measure the light emitted by the LED 310. One of the reflective methods can be used to detect the reflected signal after incident. Green, red, or infrared may be used as a light source of the light emitting diode 310 for measuring the PPG.

3B is a diagram illustrating a PPG signal output from an optical sensor and a peak to peak interval (PPI) calculation.

Referring to FIG. 3B, the photosensor 220 may detect a change in which the finger becomes brighter as the blood is discharged during the systolic phase and becomes slightly darker in the systolic phase according to the heart rate. In the systolic phase, the amount of light detected by the photodiode 315 decreases as 345, and in the diastolic phase, the PPG signal in which the amount of light detected by the photodiode 315 increases as such as 340 can be output. The control unit 200 may analyze the amount of change in the detected amount of light to output a PPG signal, and determine a heart rate by analyzing the PPG signal and detecting a PPI of the detected peak of the PPG signal. For example, the control unit 200 may determine the heart rate by measuring the interval (e.g., the period of the pulse) having a minimum value such as PPI 350 or 345 of the PPG signal such as 340, and calculating how many pulses per second are generated as a result. have.

3C is a diagram illustrating a relationship between an actual heart rate and a measured heart rate when measuring heart rate in an electronic device.

Referring to FIG. 3C, when measuring heart rate, accurate heart rate can be measured only when noise caused by the inflow of ambient light included in the PPG signal output from the optical sensor 220 and the effect of movement of the device are removed. Therefore, when measuring heart rate, it may require time to measure a stable PPG signal while removing these external factors. For example, as shown in FIG. 3C, when the HR value by signal processing measures the heart rate in the initial heart rate measurement section, the HR value measured by the signal processing as at 370 at the initial driving point is reference number 370 and It can have the same actual HR value and a difference value equal to 380. Therefore, when measuring the heart rate, the heart rate is determined and displayed using the PPG signal output from the optical sensor 220 at the initial driving time, and the movement of the device and external noise factors are determined at the time when the electronic device is stabilized after a certain period of time has elapsed. A method of outputting a heart rate using the removed PPG signal may be effective.

In various embodiments of the present invention, in the HR measurement method, in order to obtain a stable HR value, an external environment analysis process or an adaptive filter process may be included. As the number of processors increases, a stable HR output generation delay may occur. The HR can be output by a method with a small number of processes until the stable HR value is obtained. 4 is a diagram illustrating a configuration of a control unit for measuring heart rate in an electronic device. The control unit 200 may include a conversion unit 410, a first HR generation unit 420, a second HR generation unit 430, and an HR processing unit 400.

Referring to FIG. 4, the conversion unit 410 may amplify the PPG signal output from the photosensor 220 and process it as a digital signal. The conversion unit 410 may be located between the control unit 200 and the optical sensor 220. The first HR generation unit 420 may generate a HR1 signal by calculating a PPI of the PPG signal output from the conversion unit 410. Further, the second HR generation unit 430 filters a motion component of the device output from the sensor unit 230 using an adaptive filter, and the output of the adaptive filter is a PPG signal output from the conversion unit 410. It is possible to generate HR2 by using a PPG signal that compensates for the motion of the device by applying it to. For example, the sensor unit 230 may be an acceleration sensor.

The HR processing unit 400 may analyze the generated HR1 and HR2 and output a final HR. The HR processing unit 400 may determine an output HR by analyzing a difference value between HR1 and HR2 during initial driving. In an electronic device including a heart rate measurement module, the optical sensor 220 may generate a PPG signal. For example, the photosensor 220 may generate a PPG signal by generating light from an LED, and after the light from the LED is transmitted into the user's skin, a photodiode detects a part of the light. In addition, the PPG signal may be amplified by a conversion unit 410 and converted into digital data through ADC conversion. The PPG data may be converted into compensated PPG data through an algorithm that compensates for the influence of motion of the electronic device, and an HR signal may be generated and output using the compensated PPG data.

The electronic device according to various embodiments of the present disclosure may include a configuration for generating HR1 and a configuration for generating HR2, which is a stable HR value, when generating and outputting the HR. The large difference between HR1 and HR2 may mean that a stable HR value is not calculated in an initial state. Therefore, the final HR is determined by comparing the HR1 and HR2 values. For example, if the difference between HR1 and HR2 has a value equal to or greater than a predetermined threshold (threshold or reference value), HR1 is displayed as an output value, and if the difference value has a value within a predetermined threshold, a stable value is calculated. The HR2 value can be displayed as an output value. After starting to display the HR2 value as an output, the HR processing unit displays the continuously calculated HR2 value as an output, and in some cases enters a stable state. The value of the next moment can be displayed continuously as output.

5A and 5B are diagrams for explaining a method of generating HR1 in a first HR generation unit.

5A, the HR processing unit 400 may select the output of the first HR generator 420 that calculates and generates HR1 through peak detection of the PPG signal (HR raw data) output from the optical sensor 220 through signal processing. have. The first HR generator 420 may include a peak detector, and after detecting a peak value of the PPG data, may generate HR1 by calculating an interval PPI of the detected peak values. The PPI interval becomes an interval in the time domain state, and when the interval is changed to a frequency, the main frequency band may be checked and outputted without measuring a separate interval. The peak detector may constitute a negative peak or positive peak detector. In this case, if the peak value is detected quickly as shown in 510 of FIG. 5A, the heart rate may be generated as a high value, and if the peak value is detected slowly as shown in 520 of FIG. 5A, the heart rate may be generated as a relatively low value. Referring to FIG. 5B, the HR processing unit 400 may measure a slope of PPG data (HR raw data) by signal processing and select an output of the first HR generator 420 that generates an HR period as HR1. To this end, the storage unit 210 may store HR values corresponding to the slope, and the first HR generator 420 may include a slope detector. The slope detector of the first HR generator 420 may detect the slope of the PPG data as in 555 or 565, and then access the HR value corresponding to the detected slope from the storage unit 210 and output it as HR1. . 550 of FIG. 5B shows an example of using a tendency of a large HR value in case of a steep slope, and 560 of FIG. 5B shows an example of using a tendency of a small HR value in case of a gentle slope.

The second HR generation unit 430 may input the PPG data output from the conversion unit 410 and the output of the sensor unit 230, and may remove noise that may be introduced into the PPG data due to movement of the device and external factors. In addition, HR2 may be generated by calculating PPG data from which noise of the second HR generator 430 is removed. Here, the sensor may be a 3-axis acceleration sensor, and the noise may be a frequency of illumination (for example, 60 Hz) due to the external factor.

The second HR generator 420 may generate HR2 using an adaptive filter using an accelerometer. When measuring the PPG, the PPG signal may be distorted due to external factors (eg, movement of the device and/or the surrounding lighting environment). For example, when the examiner moves, the LED of the optical sensor 220 and the photo diode (photo detector) of the optical sensor 220 are also moved, and thus the PD of the optical sensor 220 transmits reflected or back scattered light. It may not be accurately detected. That is, when the device is placed in an unstable state, the PPG signal detected by the photosensor 220 may be distorted. Accordingly, the HR generator 420 may remove background noise from useful signals using an adaptive noise cancellation method.

The second HR generation unit 430 includes a motion detection unit that detects a state of the device (eg, a motion component) from an output of the sensor unit 230 (eg, an acceleration sensor), and an adaptive filter to which the output of the motion detection unit is applied. filter), a compensator (e.g., a subtractor) that generates a compensated PPG signal by using (for example, subtracting) the output of an adaptive filter from the PPG signal output from the photosensor 230, and calculates the compensated PPG data. Thus, it may include an HR calculator that calculates HR2.

When the movement of the electronic device occurs while the PPG signal is measured by the optical sensor 220, the optical sensor 220 generates a true signal and motion noise (the movement of the device and external lighting, etc.). It is possible to detect a mixed signal (mixture signal) including possible distortion). In addition, the sensor unit 230 (for example, an acceleration sensor of three or more axes) may detect motion of the device. Then, the adaptive filter may estimate the dynamics of the distortion process and calculate an estimate of the distortion signal in response to the measured acceleration. And the estimated distortion can be compensated by the compensator. The compensator may generate a compensated PPG signal by subtracting the estimated distortion from the output of the photosensor 220. The adaptive filter may include a dynamic model that predicts how a distorted signal component is generated in response to acceleration.

As described above, during the initial measurement of HR, the HR processing unit 400 may determine and output HR1 output from the first HR generation unit 220 as the final HR until the stable HR2 of the second HR generation unit 430 is generated. When the second HR generation unit 430 generates a stable HR2, the HR processing unit 400 maintains an operation of outputting the HR2 as a final HR.

When the HR is initially driven, the HR processing unit 400 compares the HR1 and HR2 to output a difference value when the HR processing unit 400 compares the difference value with a set reference value and outputs the HR1 when it is greater than the reference value. If it is smaller than the reference value, it may include a determination unit 450 that outputs the HR2. The HR processing unit 400 selects and outputs the HR1 from the time when the HR measurement starts until the second HR generation unit 430 generates a stable HR2 signal, and when the operation of the second HR generation unit 430 is stabilized (e.g. For example, if the difference between the HR1 and HR2 has a value within the set reference value), the HR2 is selected and output. And when the second HR generation unit 430 outputs a stable HR2, the HR processing unit 400 maintains the output of HR2.

In addition, when a sudden change in condition is detected, the HR processing unit 400 may determine and output HR1 output from the first HR generation unit 220 as a final HR until a stable HR2 of the second HR generation unit 430 is generated. For example, if the electronic device is a watch or band type electronic device that can be worn on a wrist, etc., when the electronic device is removed and worn again, the time that the HR2 generator 430 converges until the operation is stabilized. It can take a lot. In this case, the HR processing unit 400 may output HR under the same conditions as in the initial HR measurement. In this case, a method of detecting the sudden change in condition may use a PPG signal or a separate sensor. For example, in the case of a watch or band type electronic device, the DC level is sensed relatively higher when the device is worn than when the device is not worn. Therefore, the HR processing unit 400 measures the DC level of the PPG signal, and if the measured DC level changes abruptly (for example, when the electronic device is taken off while wearing or worn while the electronic device is worn), the initial HR HR can be determined and output in the same way as for measurement.

As described above, the electronic device capable of measuring HR according to various embodiments includes an optical sensor 220 including an LED and a photodiode that generates light, a conversion unit 410 that processes a signal sensed by the optical unit, and information about motion. It may include an acceleration sensor unit 230 provided, and a control unit that receives the output of the conversion unit 410 and the acceleration sensor output and performs digital calculation.

In addition, the optical sensor 220 may include a Photo Detector, IR, and Red LED. In addition, the optical sensor 220 may include a Photo Detector and a Green LED. In addition, the optical sensor 220 may include Green, IR, and Red LEDs together.

The conversion unit 410 may include an amplifier and an ADC. The sensor unit 230 may use an acceleration sensor having three or more axes. The control unit 200 may include a first HR generation unit 420, a second HR generation unit 430 that may include a motion removal algorithm and an HR calculation algorithm, and an HR processing unit 400 that determines and outputs a final HR by determining HR1 and HR2.

6 is a block diagram of an electronic device according to various embodiments. The electronic device may constitute, for example, all or part of the electronic device 101 illustrated in FIG. 1. Referring to FIG. 6, the electronic device includes at least one application processor (AP) 610, a communication module 620, a subscriber identification module (SIM) card 624, a memory 630, a sensor module 640, an input device 650, a display 660, and an interface. 670, an audio module 680, a camera module 691, a power management module 695, a battery 696, an indicator 697, and a motor 698.

The AP 610 may control a plurality of hardware or software components connected to the AP 610 by driving an operating system or an application program, and may perform various data processing and operations including multimedia data. The AP 610 may be implemented with, for example, a system on chip (SoC). According to an embodiment, the AP 610 may further include a Graphic Processing Unit (GPU) (not shown).

The communication module 620 (eg, the communication interface 160) performs data transmission/reception in communication between the electronic device (eg, the electronic device 101) and other electronic devices (eg, the electronic device 104 or the server 106) connected through a network. can do. According to an embodiment, the communication module 620 may include a cellular module 621, a Wifi module 623, a BT module 625, a GPS module 627, an NFC module 628, and a radio frequency (RF) module 629.

The cellular module 621 may provide a voice call, a video call, a text service, or an Internet service through a communication network (eg, LTE, LTE-A, CDMA, WCDMA, UMTS, WiBro, GSM, etc.). In addition, the cellular module 621 may distinguish and authenticate electronic devices within a communication network using, for example, a subscriber identification module (eg, a SIM card 624). According to an embodiment, the cellular module 621 may perform at least some of the functions that the AP 610 can provide. For example, the cellular module 621 may perform at least a part of a multimedia control function.

According to an embodiment, the cellular module 621 may include a Communication Processor (CP). In addition, the cellular module 621 may be implemented as an SoC, for example. In FIG. 6, components such as the cellular module 621 (for example, a communication processor), the memory 630, or the power management module 695 are shown as separate components from the AP 610, but according to an embodiment, the AP and The 610 may be implemented to include at least some of the above-described components (eg, the cellular module 621).

According to an embodiment, the AP 610 or the cellular module 621 (for example, a communication processor) loads and processes commands or data received from at least one of a nonvolatile memory or other components connected to each of the volatile memory. can do. In addition, the AP 610 or the cellular module 621 may store data received from at least one of the other components or generated by at least one of the other components in a nonvolatile memory.

Each of the Wifi module 623, the BT module 625, the GPS module 627, or the NFC module 628 may include, for example, a processor for processing data transmitted and received through a corresponding module. In FIG. 6, the cellular module 621, the Wifi module 623, the BT module 625, the GPS module 627 or the NFC module 628 are shown as separate blocks, respectively, but according to an embodiment, the cellular module 621, the Wifi module 623, the BT module 625, GPS At least some (eg, two or more) of the module 627 or the NFC module 628 may be included in one integrated chip (IC) or IC package. For example, at least some of the processors corresponding to each of the cellular module 621, the Wifi module 623, the BT module 625, the GPS module 627, or the NFC module 628 (e.g., a communication processor corresponding to the cellular module 621 and a communication processor corresponding to the Wifi module 623) Wifi processor) can be implemented with one SoC.

The RF module 629 may transmit/receive data, for example, transmit/receive an RF signal. Although not shown, the RF module 629 may include, for example, a transceiver, a power amp module (PAM), a frequency filter, or a low noise amplifier (LNA). In addition, the RF module 629 may further include a component for transmitting and receiving electromagnetic waves in free space in wireless communication, for example, a conductor or a conducting wire. In FIG. 6, the cellular module 621, the Wifi module 623, the BT module 625, the GPS module 627, and the NFC module 628 are shown to share one RF module 629 with each other, but according to one embodiment, the cellular module 621, the Wifi module 623 At least one of the BT module 625, the GPS module 627, and the NFC module 628 may transmit/receive an RF signal through a separate RF module.

The SIM card 624 may be a card including a subscriber identification module, and may be inserted into a slot formed at a specific location of the electronic device. The SIM card 624 may include unique identification information (eg, integrated circuit card identifier (ICCID)) or subscriber information (eg, international mobile subscriber identity (IMSI)).

The memory 630 (for example, the memory 130) may include an internal memory 632 or an external memory 634. The internal memory 632 may be, for example, a volatile memory (e.g., dynamic RAM (DRAM), static RAM (SRAM), synchronous dynamic RAM (SDRAM), etc.)) or non-volatile memory (e.g., , At least one of OTPROM (one time programmable ROM), PROM (programmable ROM), EPROM (erasable and programmable ROM), EEPROM (electrically erasable and programmable ROM), mask ROM, flash ROM, NAND flash memory, NOR flash memory, etc.) It may include.

According to an embodiment, the internal memory 632 may be a solid state drive (SSD). The external memory 634 is a flash drive, for example, compact flash (CF), secure digital (SD), micro secure digital (Micro-SD), mini secure digital (Mini-SD), extreme digital (xD), or a Memory Stick. And the like may be further included. The external memory 634 may be functionally connected to the electronic device through various interfaces. According to an embodiment, the electronic device 101 may further include a storage device (or storage medium) such as a hard drive.

The sensor module 640 may measure a physical quantity or detect an operating state of the electronic device 101 and convert the measured or detected information into an electric signal. The sensor module 640 is, for example, a gesture sensor 640A, a gyro sensor 640B, an atmospheric pressure sensor 640C, a magnetic sensor 640D, an acceleration sensor 640E, a grip sensor 640F, a proximity sensor 640G, a color sensor 640H (e.g., RGB (red, green, blue) sensor), a biometric sensor 640I, a temperature/humidity sensor 640J, an illuminance sensor 640K, or an ultra violet (UV) sensor 640M.

Here, the biosensor 640I may be a heart rate measurement sensor. The heart rate sensor may include an LED and a photodiode. The LED can work to generate light. After the light from the LED is transmitted into the user's skin, the photodiode can detect a part of the light. The detected light is amplified through an amplifier, and a digital value can be transferred to the processor through ADC conversion. In addition, the acceleration sensor 840E can separately transmit information of the acceleration sensor from the processor.

Then, the AP 810 may perform an algorithm for compensating for the influence of the motion measured through the acceleration sensor, and may perform a process of calculating HR using the digitally converted input signal. When measuring and outputting the HR value, the AP810 calculates the HR1 value, calculates the HR2 value, compares the HR1 value and the HR2 value to determine an output HR value, and outputs the determined HR value. .

Additionally or alternatively, the sensor module 640 may include, for example, an olfactory sensor (E-nose sensor, not shown), an EMG sensor (electromyography sensor, not shown), an EEG sensor (electroencephalogram sensor, not shown), and an ECG sensor ( An electrocardiogram sensor, not shown), an infrared (IR) sensor (not shown), an iris sensor (not shown), or a fingerprint sensor (not shown). The sensor module 640 may further include a control circuit for controlling at least one or more sensors included therein.

The input device 650 may include a touch panel 652, a (digital) pen sensor 654, a key 656, or an ultrasonic input device 658. The touch panel 652 may recognize a touch input using at least one of, for example, a capacitive type, a pressure sensitive type, an infrared type, or an ultrasonic type. In addition, the touch panel 652 may further include a control circuit. In the case of capacitive type, physical contact or proximity recognition is possible. The touch panel 652 may further include a tactile layer. In this case, the touch panel 652 may provide a tactile reaction to a user.

The (digital) pen sensor 654 may be implemented using, for example, a method identical or similar to that of receiving a user's touch input or a separate recognition sheet. The key 656 may include, for example, a physical button, an optical key, or a keypad. The ultrasonic input device 658 is a device capable of checking data by detecting sound waves with a microphone (eg, a microphone 688) in the electronic device 101 through an input tool generating an ultrasonic signal, and wireless recognition is possible. According to an embodiment, the electronic device 801 may receive a user input from an external device (eg, a computer or a server) connected thereto by using the communication module 620.

The display 660 (eg, the display 150) may include a panel 662, a hologram device 664, or a projector 666. The panel 662 may be, for example, a liquid-crystal display (LCD) or an active-matrix organic light-emitting diode (AM-OLED). The panel 662 may be implemented to be flexible, transparent, or wearable, for example. The panel 662 may be configured with the touch panel 652 as a single module. The hologram device 664 may show a 3D image in the air by using interference of light. The projector 666 may display an image by projecting light onto a screen. The screen may be located inside or outside the electronic device 101, for example. According to an embodiment, the display 660 may further include a control circuit for controlling the panel 662, the hologram device 664, or the projector 666.

The interface 670 may include, for example, a high-definition multimedia interface (HDMI) 672, a universal serial bus (USB) 674, an optical interface 676, or a D-subminiature (D-sub) 678. The interface 670 may be included in, for example, the communication interface 160 illustrated in FIG. 1. Additionally or alternatively, the interface 670 includes, for example, a mobile high-definition link (MHL) interface, a secure digital (SD) card/multi-media card (MMC) interface, or an infrared data association (IrDA) standard interface. can do.

The audio module 680 may bidirectionally convert sound and electrical signals. At least some components of the audio module 680 may be included in, for example, the input/output interface 140 illustrated in FIG. 1. The audio module 680 may process sound information input or output through, for example, a speaker 682, a receiver 684, an earphone 686, or a microphone 688.

The camera module 691 is a device capable of photographing still images and moving pictures, and according to an embodiment, one or more image sensors (eg, a front sensor or a rear sensor), a lens (not shown), an image signal processor (ISP, not shown) ) Or flash (not shown) (eg, LED or xenon lamp).

The power management module 695 may manage power of the electronic device 101. Although not shown, the power management module 695 may include, for example, a power management integrated circuit (PMIC), a charger integrated circuit (IC), or a battery or fuel gauge.

The PMIC may be mounted in, for example, an integrated circuit or an SoC semiconductor. Charging methods can be divided into wired and wireless. The charger IC may charge a battery and prevent overvoltage or overcurrent from flowing from a charger. According to an embodiment, the charger IC may include a charger IC for at least one of a wired charging method or a wireless charging method. The wireless charging method includes, for example, a magnetic resonance method, a magnetic induction method, or an electromagnetic wave method, and additional circuits for wireless charging, for example, a circuit such as a coil loop, a resonance circuit, or a rectifier may be added. have.

The battery gauge may measure, for example, the remaining amount of the battery 696, voltage, current, or temperature during charging. The battery 696 may store or generate electricity, and supply power to the electronic device 101 by using the stored or generated electricity. The battery 696 may include, for example, a rechargeable battery or a solar battery.

The indicator 697 may display a specific state of the electronic device 101 or a part thereof (eg, the AP 610), for example, a boot state, a message state, or a charging state. The motor 698 may convert an electrical signal into mechanical vibration. Although not shown, the electronic device 101 may include a processing device (eg, a GPU) for supporting mobile TV. The processing device for supporting mobile TV may process media data according to standards such as digital multimedia broadcasting (DMB), digital video broadcasting (DVB), or media flow. Each of the above-described components of an electronic device according to various embodiments of the present disclosure may be composed of one or more components, and the name of the corresponding component may vary according to the type of the electronic device. An electronic device according to various embodiments of the present disclosure may include at least one of the above-described components, and some components may be omitted or additional other components may be further included. In addition, some of the constituent elements of an electronic device according to various embodiments of the present disclosure are combined to form a single entity, so that functions of the corresponding constituent elements before the combination may be performed in the same manner.

Electronic devices according to various embodiments include an optical sensor detecting a PPG signal, a sensor unit detecting a device state, and generating a first heart rate and a second heart rate from the measured PPG signal, and generating the first heart rate and the second heart rate. A control unit configured to analyze the heart rate to determine an output heart rate, and a display unit to display the determined heart rate.

The control unit may include a first heart rate generator that generates a first heart rate using the PPG signal, a second heart rate generator, and a heart rate processor that compares and analyzes the first heart rate and the second heart rate.

The heart rate processing unit compares the absolute value (eg, analysis processing value) of the difference between the first heart rate and the second heart rate with a set reference value, and when the absolute value (analysis processing value) of the difference is greater than the reference value, It may include a determination unit that outputs one heart rate and outputs the second heart rate when it is less than the reference value.

The optical sensor may include a light-emitting unit that generates light for measuring a PPG signal, and a light-receiving unit that receives light that changes according to relaxation and contraction of blood vessels.

The first heart rate generator may detect a peak value of the PPG signal to obtain a PPI, and may generate the first heart rate by calculating the PPI at a reference time.

The first heart rate generator may further include a memory for storing heart rate values corresponding to the slope of the PPG signal, and the first heart rate generator detects the slope of the PPG signal and corresponds to the measured slope in the memory. The corresponding heart rate value can be determined.

The second heart rate generator comprises a state detection unit that detects the state of the device from the output of the sensor unit, an adaptive filter that reflects the state information of the device from the detection unit, and compensates the PPG signal using an adaptive filter. A compensator for generating the obtained PPG, and a second heart rate calculator for calculating a second heart rate by analyzing the compensated PPG signal.

The state detection unit may include at least one of an acceleration sensor and a temperature sensor.

After determining the output heart rate as the second heart rate, the controller maintains the output of the second heart rate, and when the level change of the PPG signal exceeds a set reference value, the first heart rate may be determined as the output heart rate.

After determining the second heart rate, the controller may continue to maintain the output of the second heart rate.

The controller analyzes the PPG signal while maintaining the second heart rate, and may determine the first heart rate as the output heart rate when the change in the PPG signal exceeds a reference value.

7 is a flowchart illustrating a method of measuring a heart rate in an electronic device.

Referring to FIG. 7, the control unit 200 generates HR1 by calculating the PPG signal output from the optical sensor 220 in operation 711, and uses the PPG signal output from the optical sensor 220 and the output of the sensor unit 230 in operation 713. Thus, the HR2 signal is generated. In operation 715, the control unit 200 checks whether the device is in a stabilized state. At this time, the control unit 200 calculates a difference value between the HR1 and HR2 at the initial driving time when heart rate measurement starts, and then compares the difference value with a set reference value, and if the difference value is greater than the reference value, the device is determined to be in an unstable state. If the difference value has a value within the reference value range, the device can be determined to be in a stable state. In addition, during the initial driving, the second HR generator 430 that generates the HR2 signal measures a time for generating a stable output, and the control unit 200 may determine that the device is in a stable state when the measured time elapses. The controller 200 may output HR1 in operation 717 when it is determined that the device is in an unstable state in operation 715, and output HR2 in operation 719 when it is determined that the device is in a stable state.

In addition, if the device is in a stable state and sudden movement occurs, the device may become unstable. For example, in a wearable electronic device, when the electronic device is worn or taken off, the PPG signal generated by the optical sensor 220 may be greatly distorted, and the second HR generator 430 may not completely compensate for the distortion of the motion component. I can. For example, when the device is in contact with the blood vessel and the contact is released or the contact is released while the device is in contact with the blood vessel, or if movement occurs while the device is close to the blood vessel, the device may be in an unstable state. The controller 200 may change the DC level of the PPG signal detected by the optical sensor 220 according to the movement of the device (for example, the device contacts a blood vessel, close contact, or spaced a predetermined distance, etc.). Accordingly, if the DC level of the PPG signal is significantly changed, the control unit 100 may determine that the device is in an unstable state in operation 715. In addition, if it is determined in operation 715 that the device is in an unstable state, the control unit 200 may output HR1 in operation 717.

8 is a flowchart illustrating a method of calculating a heart rate using a PPG signal in an electronic device. 8 illustrates a method of generating HR by detecting a peak value of a PPG signal.

Referring to FIG. 8, the electronic device receives a PPG signal output from the photosensor 220 in operation 811, and amplifies and converts the PPG signal into digital data in operation 813. Here, operations 811 and 813 may be processed by a signal processing unit (eg, an analog signal processing unit) that may be located between the control unit 200 and the optical sensor 220. Thereafter, the control unit 200 detects the peak value of the PPG data in operation 815, and calculates the peak value interval (PPI) in operation 817 to generate HR1. In operation 819, the controller 200 outputs the HR1 if the device is not stabilized.

The method of calculating HR1 by the control unit 200 may include a method of calculating HR1 by detecting a peak value of PPG data as in operation 815 of FIG. 8, and a method of calculating HR1 by detecting a slope of PPG data. First, the former method may generate HR1 by detecting a peak value of the PPG data, and then calculating an interval PPI (eg, frequency) between the detected peak values. The peak detection method may use a negative peak or a positive peak detection method. In this case, when the peak value is detected quickly, the heart rate may be generated as a high value, and when the peak value is detected slowly, the heart rate may be generated as a relatively low value. In addition, the controller 200 may determine an HR cycle by measuring a slope of PPG data (HR raw data), and generate the determined HR as HR1. For example, after detecting the slope of the PPG data, the control unit 200 may access the HR value corresponding to the detected slope from the storage unit 210 and output it as HR1. At this time, if the PPG data has a steep slope, the HR1 value can be estimated as a large value, and when the PPG data has a gentle slope, the HR1 value can be estimated as a small value.

9 is a flowchart illustrating a method of calculating a heart rate using a PPG signal and a sensor in an electronic device.

Referring to FIG. 9, the electronic device receives a PPG signal output from the photosensor 220 in operation 911, and amplifies and converts the PPG signal into digital data in operation 913. Here, operations 911 and 913 may be processed by a signal processing unit (eg, an analog signal processing unit) that may be located between the control unit 200 and the optical sensor 220. At this time, the PPG signal output from the photosensor 220 may be a mixture signal including motion noise in the pure PPG signal. To remove this, the control unit 200 controls the sensor unit 230 (for example, 3) in operation 917. The motion of the device is detected by receiving the output of the acceleration sensor (above the axis), and in response to the acceleration measured in operation 919, the dynamics of the distortion process can be estimated, and an estimate of the distortion signal can be calculated. The controller 200 generates the compensated PPG data by subtracting the estimated value of the distortion signal from the PPG data in operation 915, and calculates the compensated PPG data to generate HR2. The HR2 is outputted at.

10 is a flowchart illustrating an HR measurement procedure in an electronic device.

Referring to FIG. 10, when HR measurement is requested, the controller 200 detects it in operation 1011 and calculates HR1 and HR2 while performing operations 1013 and 1015. Here, the HR1 may be an HR calculated using a PPG signal output from the optical sensor 220, and the HR2 may be an HR calculated using a PPG signal compensated for distortion occurring in a motion component of the device. . In operation 1017, the controller 200 calculates a difference value between HR1 and HR2, and then compares the difference value with a set reference value to check the state of the device. At this time, if the difference value has a value greater than the reference value, the control unit 200 determines that it is unstable in operation 1017 and selects and outputs HR1 in operation 1017. In the unstable state of the device as described above, the controller 200 outputs the HR1. Thereafter, the HR2 outputs a stable value, and in this case, the difference value has a value smaller than the reference value. Then, the controller 200 detects this in operation 1017 and outputs the HR2 in operation 1021. In addition, when the device is in a stable state, the control unit 200 can know this in operation 1017, and thus the control unit 200 can maintain the output of HR2 in operation 1021. When the HR measurement is requested, the controller 200 calculates HR1 and HR2. In addition, HR2, which is calculated in an unstable state of the device, such as initial driving, may not be able to generate a stable signal. Here, the state of the device may take into account the movement of the device, the ambient temperature, the amount of ambient light, and the sudden change of the PPG sensor. Accordingly, the controller 200 may display HR1 using the PPG signal in an initial state in which HR measurement is not stable in consideration of the state of the device, and may display HR2 calculated in consideration of the state of the device when the device becomes stable. .

11 is a flowchart illustrating another example of an HR measurement procedure in an electronic device.

Referring to FIG. 11, operation 1019 in operation 1111 may be performed in the same manner as operation 1019 in operation 1011 in FIG. 10. In addition, when the device is stable, the controller 200 may detect this in operation 1117 and output the HR2 in operation 1131. For example, the control unit 200 calculates the difference between HR1 and HR2 in step 1117, and compares the absolute value of the calculated difference value with the set reference value Th (Diff(abs(HR1-HR2))>Th?). In addition, if the comparison result is greater than the reference value, the controller 200 may determine that the device is in an unstable state, and output and display the HR1 value in step 1119. In addition, if the comparison result is smaller than the reference value, the controller 200 may determine that the device is in a stable state, and output and display the HR1 value in step 1131.

In addition, when the device is stable, the controller 200 maintains the output of HR2, and when the output of HR2 is maintained, the controller 200 may generate the HR1 and HR2 in operations 1133 and 1135.

In operation 1137, the controller 200 checks the state of the device. This is to output HR1 until the HR2 is stably generated when the device changes from the outputting HR2 to an unstable state. The condition for determining the state of the device may be a movement of the device or a change in ambient temperature or light intensity or an output of a PPG sensor. For example, if the electronic device is a watch type electronic device that can be worn on a wrist or the like, when the electronic device is removed and then worn again, it may take a long time to converge until the device is stabilized. When the controller 200 detects the sudden movement of the device through the acceleration sensor, it may sense it in step 1137 and output the HR under the same conditions as the initial HR measurement. In this case, a method of detecting the sudden change in condition may use a PPG signal or a separate sensor. For example, in the case of a watch-type electronic device, the DC level is detected relatively higher in the wearing state than in the unworn state. Therefore, the controller 200 measures the DC level of the PPG signal, and if the measured DC level changes abruptly (for example, when the electronic device is removed while wearing or worn while the electronic device is worn), the device becomes unstable. It can be judged by the state. Accordingly, when the device transitions to an unstable state, the controller 200 detects it in operation 1137 and returns to the operation 1113. Accordingly, the electronic device can determine and output HR in the same manner as in the initial HR measurement. However, if the device maintains a stable state, the controller 200 may detect this in operation 1137 and maintain the output state of HR2 in operation 1141. In addition, the electronic device may further include a temperature sensor that senses the surrounding temperature. In addition, when the output of the temperature sensor has a sudden change (for example, when the device moves from a cold place to a hot place (when entering from outdoors in winter)), the control unit 200 detects this in step 1137. The above operation can be performed. In addition, the electronic device may further include an illuminance sensor that senses the amount of light around it. If there is a sudden change in the amount of ambient light, the control unit 200 may detect it in step 1137 and perform the same operation as described above. In addition, the electronic device may determine that the device is in an unstable state even when the output of the PPG sensor changes significantly. The above operation may be performed until the HR measurement operation is terminated, and the HR measurement is terminated. When is requested, the controller 200 may detect it in operation 1139 and terminate the HR measurement.

As described above, the electronic device may be equipped with an optical sensor (a PPG sensor or a sensor for measuring a heart rate) to measure HR using PPG. In the HR method of various embodiments of the electronic device according to the present disclosure, the HR1 value may be provided as an output until stable HR values are acquired, and then the HR2 may be output when the stable HR2 value is acquired. Accordingly, the HR measuring device is configured to have an unstable device. In the state, until the actual HR value is displayed, it is possible to minimize the provision of false information that differs greatly from the actual value.

A heart rate processing method of an electronic device according to various embodiments includes an operation of detecting a PPG signal, an operation of generating a first heart rate from the measured PPG signal, an operation of generating a second heart rate from the measured PPG signal, and , An operation of determining an output heart rate by analyzing the first heart rate and the second heart rate, and an operation of displaying the output heart rate.

The determining of the output heart rate includes an operation of comparing an absolute value of the difference between the first heart rate and the second heart rate with a set reference value, determining the first heart rate when the absolute value of the difference is greater than the reference value, and If the absolute value of the difference is less than the reference value, an operation of determining the second heart rate may be included.

The determining of the output heart rate may further include an operation of continuously maintaining the output of the second heart rate after determining the second heart rate.

The determining of the output heart rate further includes an operation of analyzing the PPG signal while maintaining the second heart rate, and determining the first heart rate as an output heart rate when a change in the PPG signal exceeds a reference value. I can.

The operation of generating the first heart rate may include an operation of converting a change of the PPG signal into a frequency, and an operation of generating a first heart rate by analyzing the frequency at a reference time.

The operation of generating the first heart rate may include an operation of detecting a peak value of the PPG signal and generating a peak-to-peak interval (PPI) as a first heart rate through an operation. The operation of detecting an interval between the peak values may detect an interval between a positive peak or a negative peak value of the PPG signal.

The generating of the first heart rate may include measuring a slope of the PPG signal, storing heart rate values corresponding to the slope, and determining a heart rate value corresponding to the measured slope.

The operation of generating the second heart rate may include an operation of detecting a state of the device and correcting the PPG signal according to the state of the device to obtain a second heart rate from the corrected PPG signal.

The generating of the second heart rate includes measuring a state of the device, generating an adaptive filter according to the state, and generating a PPG compensated for the PPG signal using an adaptive filter. And, it may include an operation of generating a second heart rate through the compensated PPG.

The operation of generating the second heart rate may be measured using at least one of an output of an acceleration sensor or an output of a temperature sensor.

The heart rate processing method of an electronic device according to various embodiments includes an operation of generating and outputting a first heart rate from a PPG signal at the start of heart rate measurement, sensing movement of the device, and correcting the PPG signal according to the detected movement. , Generating a second heart rate from the corrected PPG signal, analyzing the first heart rate and the second heart rate, and determining the second heart rate as an output heart rate when the second heart rate is stable output, It may include an operation of displaying the output heart rate.

The determining of the output heart rate may further include an operation of continuously maintaining the output of the second heart rate after determining the second heart rate.

The determining of the output heart rate further includes an operation of analyzing the PPG signal while maintaining the second heart rate, and determining the first heart rate as an output heart rate when a change in the PPG signal exceeds a reference value. I can.

The term "module" used in various embodiments of the present invention may mean a unit including one or a combination of two or more of hardware, software, or firmware, for example. “Module” may be used interchangeably with terms such as unit, logic, logical block, component, or circuit. “Module” may be the smallest unit or part of an integrally configured part. A “module” may be a minimum unit or a part of one or more functions. The “module” can be implemented mechanically or electronically. For example, the "module" according to various embodiments of the present invention is known or developed in the future, an application-specific integrated circuit (ASIC) chip, field-programmable gate arrays (FPGAs), or programmable logic that performs certain operations. It may include at least one of programmable-logic devices.

According to various embodiments, at least a part of an apparatus (eg, modules or functions thereof) or a method (eg, operations) according to various embodiments of the present disclosure may be computer-readable in the form of, for example, a programming module. It can be implemented as a command stored in a computer-readable storage media. When the command is executed by one or more processors (eg, the processor 210), the one or more processors may perform a function corresponding to the command. The computer-readable storage medium may be, for example, the memory 220. At least a part of the programming module may be implemented (for example, executed) by the processor 210, for example. At least a part of the programming module may include, for example, a module, a program, a routine, a set of instructions or a process for performing one or more functions.

The computer-readable recording medium includes magnetic media such as hard disks, floppy disks, and magnetic tapes, and optical recording media such as Compact Disc Read Only Memory (CD-ROM) and Digital Versatile Disc (DVD). Media), Magnetic-Optical Media such as a floptical disk, and program commands such as read only memory (ROM), random access memory (RAM), flash memory, etc. A hardware device specially configured to store and perform modules). Further, the program instruction may include not only machine language codes such as those produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The above-described hardware device may be configured to operate as one or more software modules to perform operations of various embodiments of the present invention, and vice versa.

A module or a programming module according to various embodiments of the present disclosure may include at least one or more of the above-described components, some of the above-described components may be omitted, or additional other components may be further included. Operations performed by a module, a programming module, or other components according to various embodiments of the present disclosure may be executed sequentially, in parallel, repeatedly, or in a heuristic manner. In addition, some operations may be executed in a different order, omitted, or other operations may be added.

In addition, the embodiments of the present invention disclosed in the specification and drawings are only provided to provide specific examples to easily explain the technical content of according to the embodiments of the present invention and to aid in understanding of the embodiments of the present invention, and the scope of the embodiments of the present invention I am not trying to limit it. Therefore, the scope of various embodiments of the present invention should be interpreted as being included in the scope of various embodiments of the present invention in addition to the embodiments disclosed herein, all changes or modified forms derived based on the technical idea of various embodiments of the present invention. .

101, 104: electronic device
200: control unit 210: storage unit
220: optical sensor 230: sensor unit
240: display unit 250: input unit

Claims (24)

In the heart rate processing method of an electronic device,
An operation of detecting a light blood flow (PPG) signal using an optical sensor, and
An operation of detecting a state of the electronic device using a sensor unit,
When starting heart rate measurement, generating a first heart rate from the detected optical blood flow signal,
Correcting the optical blood flow signal detected through the optical sensor according to the state of the electronic device detected through the sensor unit, and generating a second heart rate from the corrected optical blood flow signal,
An operation of checking whether the electronic device is in a stabilized state based on the signal detected through the sensor unit, and
The control unit calculates a difference value between the first heart rate and the second heart rate, and when the calculated difference value is less than a set reference value, the electronic device determines that the electronic device is in a stable state and displays the second heart rate on the display unit. ,
If the calculated difference value is greater than a set reference value, determining that the electronic device is in an unstable state and displaying the first heart rate on a display unit,
When the heart rate measurement starts, the first heart rate is displayed on the display unit, and after a predetermined time elapses after the measurement is started, the second heart rate is displayed on the display unit when the electronic device is in a stable state. delete The method of claim 1,
After the second heart rate is displayed through the display, the method further comprises an operation of continuously maintaining the display of the second heart rate. The method of claim 3,
Analyzing the optical blood flow signal while maintaining the second heart rate, and
The method further comprising determining the first heart rate as an output heart rate when the change in the optical blood flow signal exceeds a reference value. The method of claim 1, wherein the operation of generating the first heart rate,
An operation of converting the change in the optical blood flow signal into a frequency,
And generating the first heart rate by analyzing the frequency at a reference time. The method of claim 1, wherein the operation of generating the first heart rate,
And generating a first heart rate by detecting a peak value of the optical blood flow signal and detecting a peak-to-peak interval (PPI). The method of claim 6,
The detecting of the interval between the peak values may include detecting an interval between a positive peak or a negative peak value of the optical blood flow signal. The method of claim 1, wherein the operation of generating the first heart rate,
Measuring the slope of the optical blood flow signal,
And determining a heart rate value corresponding to the measured slope based on heart rate values corresponding to the slope stored in the memory. delete The method of claim 1,
The operation of generating the second heart rate,
An operation of measuring the state of the electronic device, and
Filtering the state of the electronic device using an adaptive filter; and
Generating a compensated optical blood flow signal using the adaptive filter; and
And generating a second heart rate through the compensated PPG. The method of claim 10,
The operation of generating the second heart rate,
A method of using at least one of an output of an acceleration sensor in the electronic device, an output of a temperature sensor, or an illuminance sensor. In the electronic device,
With the display,
An optical sensor that detects a light blood flow (PPG) signal,
A sensor unit that detects a state of the electronic device,
At the start of heart rate measurement, comprising a control unit for generating a first heart rate and a second heart rate from the detected optical blood flow signal, and analyzing the first heart rate and the second heart rate,
The control unit,
Correcting the optical blood flow signal detected through the optical sensor according to the state of the electronic device detected through the sensor unit, and generating the second heart rate from the corrected optical blood flow signal,
Based on the signal detected through the sensor unit, it is checked whether the electronic device is in a stabilized state,
A difference value between the first heart rate and the second heart rate is calculated, and if the calculated difference value is less than a set reference value, the electronic device is determined to be in a stable state and the second heart rate is displayed on the display unit,
If the calculated difference value is greater than a set reference value, the electronic device is determined to be in an unstable state and the first heart rate is displayed on a display unit,
An electronic device configured to display the first heart rate on the display unit when the heart rate measurement starts, and display the second heart rate on the display unit when the electronic device is in a stable state after a predetermined period of time has elapsed after the measurement is started. The method of claim 12,
The control unit,
A first heart rate generator and a second heart rate generator for generating the first heart rate using the optical blood flow signal,
An electronic device comprising a heart rate processor for comparing and analyzing the first heart rate and the second heart rate. The method of claim 13,
The heart rate processing unit,
A comparison unit for comparing the analysis processing value of the first heart rate and the second heart rate with a set reference value,
And a determination unit configured to output the first heart rate when the analysis processing value is greater than the reference value and output the second heart rate when it is less than the reference value. The method of claim 12,
The optical sensor,
A light emitting unit that generates light for measuring the optical blood flow signal,
An electronic device including a light receiving unit that receives light that changes according to relaxation and contraction of blood vessels. The method of claim 13,
The first heart rate generator detects a peak value of the optical blood flow signal to obtain a PPI, and calculates the PPI at a reference time to generate the first heart rate. The method of claim 13,
The first heart rate generator further includes a memory for storing heart rate values corresponding to a slope of the optical blood flow signal,
The first heart rate generator detects a slope of the optical blood flow signal and determines a heart rate value corresponding to the measured slope in the memory. The method of claim 13,
The second heart rate generator,
A state detection unit that detects a state of the electronic device from an output of the sensor unit,
An adaptive filter that reflects state information of the electronic device;
A compensator for generating a PPG compensated for the optical blood flow signal by using an adaptive filter,
An electronic device comprising a second heart rate calculator configured to calculate a second heart rate by analyzing the compensated optical blood flow signal. The method of claim 18,
The state detection unit electronic device including at least one of an acceleration sensor, a temperature sensor, and an illuminance sensor. The method of claim 12,
The control unit maintains the display of the second heart rate through the display unit, and determines the first heart rate as an output heart rate when a level change of the optical blood flow signal exceeds a set reference value. delete delete delete delete

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