Electronic device, method for predicting cause of reliability degradation, and program

Abstract

To estimate causes of reliability decrease, only when reliability of biological information is decreased.SOLUTION: An electronic apparatus 100 includes a first detection part, for detecting biological information which is information of a living body, a second detection part for detecting information other than biological information detected by the first detection part, and a processing part 110. The processing part 110 calculates reliability of the biological information based on the biological information detected by the first detection part, and if the calculated reliability is below reference reliability, estimates causes why the reliability is below the reference reliability, based on information detected by the second detection part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an electronic device, a method for predicting the cause of a decrease in reliability, and a program. [Background technology]

[0002] In recent years, electronic devices that can measure biometric information such as pulse rate using sensors such as optical sensors have been developed for wearable electronic devices, such as wristwatches. While such electronic devices can easily measure biometric information, the reliability of the measured biometric information can be reduced depending on how the device is used, for example, if the device is not worn securely on the wrist. Unreliable biometric information may have a large error, and displaying information with a large error may cause unnecessary anxiety to the user. Therefore, a device that displays instructions for use that prevent a decrease in reliability is desirable. For example, Patent Document 1 discloses an electronic device and method that, when a decrease in the reliability of biometric information is predicted, displays the cause of the decrease in reliability and countermeasures for the decrease. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-41088 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the prior art, as shown in Figure 14 of Patent Document 1, for example, the message "Wipe away sweat" is displayed by inferring a decline in the reliability of biometric information from the detection values ​​of various sensors other than the biometric sensor that detects biometric information, and then displaying an instruction to encourage the user to adjust the detection value of the sensor that did not detect an appropriate value (in this case, the sweat rate sensor) to an appropriate value. In other words, even if the biometric sensor actually detects highly reliable biometric information, if the detection value of the other sensors is not within an appropriate range, the cause of the decline in the reliability of the biometric information and a countermeasure for that decrease are displayed, forcing the user to take unnecessary countermeasures.

[0005] The present invention has been made in consideration of the above-mentioned situation, and aims to provide an electronic device, a method for inferring the cause of a decrease in reliability, and a program that can infer the cause of a decrease in reliability only when the reliability of biometric information has decreased. [Means for solving the problem]

[0006] In order to achieve the above object, one aspect of the electronic device according to the present invention is to a first detection unit that detects biometric information that is information about a living body; a second detection unit that detects information other than the biological information detected by the first detection unit; a display unit that displays the detected biological information in text or graphs; a processing unit; Equipped with The processing unit calculating reliability of the biometric information based on the biometric information detected by the first detection unit; If the calculated reliability is less than the reference reliability, the second detection unit detects the Reliability Guess the reason why the reliability is below the standard death, When the reliability is low, the characters or graphs are displayed on the display unit in a manner that makes them less visible than when the reliability is high. . [Effects of the Invention]

[0007] According to the present invention, only when the reliability of biometric information is reduced, the cause of the reduction in reliability can be inferred. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a block diagram illustrating an example of a functional configuration of an electronic device according to an embodiment. [Figure 2] FIG. 1 is a diagram illustrating an example of an external appearance of an electronic device as viewed from the front. [Figure 3] FIG. 1 is a diagram illustrating an example of the appearance of an electronic device from the rear side. [Figure 4] 10 is a diagram showing a first example in which the pulse rate display unit displays the pulse rate in an output format according to the reliability of the pulse rate. FIG. [Figure 5] 10 is a diagram showing a second example in which the pulse rate display unit displays the pulse rate in an output format according to the reliability of the pulse rate. FIG. [Figure 6] 10 is a diagram showing a third example in which the pulse rate display unit displays the pulse rate in an output format according to the reliability of the pulse rate. FIG. [Figure 7] 10 is a diagram showing a fourth example in which the pulse rate display unit displays the pulse rate in an output mode according to its reliability. FIG. [Figure 8] FIG. 10 is a diagram showing a fifth example in which the pulse rate display unit displays the pulse rate in an output format according to its reliability. [Figure 9] FIG. 10 is a diagram showing a sixth example in which the pulse rate display unit displays the pulse rate in an output format according to its reliability. [Figure 10] FIG. 10 is a diagram showing another example of the appearance of the electronic device as seen from the front. [Figure 11] FIG. 10 is a diagram showing yet another example of the appearance of the electronic device from the front. [Figure 12] FIG. 10 is a diagram showing a seventh example in which the pulse rate display unit displays the pulse rate in an output format according to its reliability. [Figure 13] 10 is a table showing examples of various output modes when displaying a pulse rate. [Figure 14] 10 is a table showing an example of the magnitude of vibration when the pulse rate is displayed by a pointer. [Figure 15] 10 is a flowchart illustrating an example of a pulse rate display process according to an embodiment. [Figure 16]10 is a flowchart illustrating an example of a needle vibration process according to an embodiment. [Figure 17] 10 is a flowchart illustrating an example of a countermeasure output process according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Electronic devices and the like according to embodiments will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals.

[0010] (Embodiment) The electronic device according to the embodiment is a wristwatch-type device, such as a smartwatch, that can measure the user's pulse rate by being worn on the user's wrist.

[0011] As shown in FIG. 1, the electronic device 100 according to the embodiment includes a processing unit 110, a memory unit 120, a sensor unit 130, a display unit 140, an operation unit 150, an output unit 155, a timing unit 160, a communication unit 170, and a position acquisition unit 180.

[0012] The processing unit 110 is configured with a processor such as a CPU (Central Processing Unit). The processing unit 110 executes pulse rate display processing (described later) and the like using a program stored in the storage unit 120. The processing unit 110 also supports multi-thread processing and can execute multiple processes in parallel.

[0013] The storage unit 120 stores programs executed by the processing unit 110 and necessary data. The storage unit 120 may include, but is not limited to, a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, etc. Note that the storage unit 120 may be provided inside the processing unit 110.

[0014] Sensor unit 130 includes pulse wave sensor 131, acceleration sensor 132, pressure sensor 133, and temperature sensor 134. However, as long as sensor unit 130 includes at least one sensor (e.g., pulse wave sensor 131) constituting a first detection unit that detects biological information and at least one sensor (e.g., pressure sensor 133) constituting a second detection unit that detects information other than biological information, sensor unit 130 does not need to include other sensors. Furthermore, sensor unit 130 may include sensors other than pulse wave sensor 131, acceleration sensor 132, pressure sensor 133, and temperature sensor 134.

[0015] The pulse wave sensor 131 includes an LED (Light Emitting Diode) and a PD (Photodiode). The LED emits light toward a living body and the light is reflected by the living body and received by the PD. The pulse wave sensor 131 detects a pulse wave based on temporal changes in the intensity of the received light. The processing unit 110 acquires a value (AD value) obtained by AD-converting the intensity of the light received by the PD using an AD (Analog-to-Digital) converter as a biological detection value, and calculates the pulse rate based on temporal changes in the AD value. The pulse wave sensor 131 may also include an AFE (Analog Front End). Even if the intensity of the light received by the PD (analog signal) is too weak to be AD-converted as is, the analog signal can be adjusted by the AFE to enable AD conversion. Furthermore, since the pulse rate and the heart rate are basically the same, the heart rate will also be referred to as the pulse rate.

[0016] The acceleration sensor 132 is a triaxial acceleration sensor that detects motion in three orthogonal axial directions. For example, when a user wearing the electronic device 100 moves, the processing unit 110 can acquire from the acceleration sensor 132 the direction and degree of acceleration of the movement.

[0017] The pressure sensor 133 measures the pressure of the electronic device 100 when worn on the arm. For example, when the user wears the electronic device 100 tightly on the arm, the pressure sensor 133 detects high pressure, and when the user wears the electronic device 100 loosely, the pressure sensor 133 detects low pressure.

[0018] The temperature sensor 134 includes, for example, a thermistor or a resistance temperature detector, and measures the ambient temperature of the electronic device 100 .

[0019] Display unit 140 includes a display device such as physical hands, a liquid crystal display, or an organic EL (Electro-Luminescence) display. Display unit 140 displays the pulse rate measured by pulse wave sensor 131, the time measured by timing unit 160, and the like. Display unit 140 may also include physical hands (second hand, minute hand, hour hand) and a date indicator, as well as an analog time display unit using a motor driver, motor, and gear train mechanism. Display unit 140 may also display analog time by displaying images of hands on a display device such as a liquid crystal display, rather than a physical analog time display unit.

[0020] The operation unit 150 is a user interface such as a crown or a push button switch, and receives operation input from the user. The processing unit 110 can acquire what operation input the user has performed based on the detection results of the rotation of the crown of the operation unit 150, the pressed state of the switches, etc. If the electronic device 100 is equipped with a touch panel integrated with the display unit 140, this touch panel also serves as the operation unit 150 and receives tap operations and the like from the user.

[0021] Output unit 155 includes a speaker and outputs voice announcements and sound effects. Note that electronic device 100 may include an LED (light emitting unit) or a vibrator (vibration unit) as output unit 155 instead of or in addition to a speaker.

[0022] The timing unit 160 measures the time that the electronic device 100 displays on the display unit 140. The timing unit 160 also has a function as a timer that measures a specified time. The timing unit 160 may be configured by software that changes a value stored in a predetermined address in the storage unit 120 every predetermined time (for example, every second), or may be configured by dedicated hardware. The timing unit 160 may also be provided inside the processing unit 110.

[0023] The communication unit 170 is a communication interface for the electronic device 100 to communicate data with external devices (e.g., smartphones, tablets, PCs (Personal Computers), other smartwatches, etc.) and to acquire information from the Internet. The communication unit 170 may include, but is not limited to, a wireless communication interface for communicating via Bluetooth (registered trademark) or a wireless LAN (Local Area Network).

[0024] The position acquisition unit 180 receives satellite signals transmitted from GPS (Global Positioning System) satellites to acquire the current position of the electronic device 100. Since the position acquisition unit 180 cannot receive satellite signals indoors, the processing unit 110 can also determine whether the current position is outdoors or indoors based on whether the position acquisition unit 180 can receive satellite signals.

[0025] 2, the electronic device 100 has an external display unit 140 on the front surface, which includes an hour hand 141, a minute hand 142, a second hand 143, a date indicator 144, a pulse rate display unit 145, and a small hand display unit 146. The electronic device 100 displays the time with the hour hand 141, the minute hand 142, and the second hand 143, the date with the date indicator 144, and the user's pulse rate with the pulse rate display unit 145. The small hand display unit 146 can display various information depending on the function of the electronic device 100, and may display, for example, the reliability of the pulse rate displayed on the pulse rate display unit 145.

[0026] 2, electronic device 100 has crown 151 and push button switches 152 and 153 on the side for accepting user operations. Electronic device 100 also has pulse wave sensor 131 and pressure sensor 133 on the back, as shown in Fig. 3. Processing unit 110 acquires the user's pulse rate based on the pulse wave signal detected by pulse wave sensor 131, and acquires the wearing pressure (wearing pressure) on the user's arm using pressure sensor 133.

[0027] Electronic device 100 acquires the user's pulse rate based on temporal changes in the received light intensity (AD value) obtained by pulse wave sensor 131. At this time, if electronic device 100 is not worn properly or the blood flow is low, the received light intensity will be low and the accuracy of acquiring the pulse rate will be poor.

[0028] In electronic device 100, the pulse rate is displayed on pulse rate display unit 145, and the acquisition accuracy is displayed as a three-level reliability index on small hand display unit 146. In the example shown in Fig. 2, the pulse rate is displayed as 76 bpm (beats per minute) and its reliability index is 2 (normal acquisition accuracy). In the example of Fig. 2, by displaying the pulse rate as numbers (letters), the pulse rate can be easily grasped even when it is difficult to read the scale of an analog display.

[0029] 2, electronic device 100 equipped with small hand display unit 146 can display a reliability index on small hand display unit 146. However, if the specifications are such that only the pulse rate is displayed on pulse rate display unit 145 and only the reliability index is displayed on small hand display unit 146, the user cannot grasp the pulse rate together with its reliability unless he or she checks both the pulse rate display unit 145 and the small hand display unit 146.

[0030] In electronic device 100, when the pulse rate is displayed on pulse rate display unit 145, it is displayed in an output format according to the reliability index so that the user can also understand the reliability index simply by checking pulse rate display unit 145.

[0031] For example, if the reliability index is 3 (good acquisition accuracy), the pulse rate is displayed in large letters on pulse rate display unit 145 as shown in Fig. 4. If the reliability index is 2 (normal acquisition accuracy), the pulse rate is displayed in medium-sized letters on pulse rate display unit 145 as shown in Fig. 5. If the reliability index is 1 (poor acquisition accuracy), the pulse rate is displayed in small letters on pulse rate display unit 145 as shown in Fig. 6.

[0032] 4 to 6 show examples in which the reliability index of the pulse rate is represented by the size of the characters displaying the pulse rate, but the output manner in which the reliability index is represented is not limited to the size of the characters. Electronic device 100 may represent the reliability index by changing at least one attribute, for example, whether or not the pulse rate is displayed, or the size, darkness, color, font, etc. of the characters displaying the pulse rate. In this way, the user can understand the pulse rate and its reliability simply by looking at pulse rate display unit 145.

[0033] Furthermore, the electronic device 100 may display marks representing the reliability index on the pulse rate display unit 145. For example, if the reliability index is 3 (good acquisition accuracy), three marks may be displayed to indicate that the reliability index is 3, as in mark 201 in FIG. 7. If the reliability index is 2 (normal acquisition accuracy), two marks may be displayed to indicate that the reliability index is 2, as in mark 202 in FIG. 8. If the reliability index is 1 (poor acquisition accuracy), one mark may be displayed to indicate that the reliability index is 1, as in mark 203 in FIG. 9. Note that although the reliability index is indicated by the number of marks in FIGS. 7 to 9, the reliability index may be indicated by changing the size, density, color, type, etc. of the marks according to the reliability, without changing the number of marks.

[0034] Furthermore, in electronic device 100 that does not include small hand display unit 146, while the pulse rate is being displayed, second hand 143 may stop displaying the seconds and instead display the reliability index instead. For example, as shown in FIG. 10, second hand 143 may point in a good reliability direction (e.g., the 6 o'clock direction in FIG. 10) to indicate that the reliability index is 1. Although not shown, second hand 143 may similarly point in a normal reliability direction (e.g., the 3 o'clock direction) to indicate that the reliability index is 2, and second hand 143 may point in a bad reliability direction (e.g., the 0 o'clock direction) to indicate that the reliability index is 1. By displaying the reliability index with a mark or hand, the reliability index can be displayed in a way that is easier for the user to understand than when the reliability index is displayed only by the output mode.

[0035] Furthermore, the display of the pulse rate on pulse rate display unit 145 is not limited to a digital display. Electronic device 100 may be provided with pulse rate display unit 145 that displays the pulse rate in analog form using pointer 148, as shown in Fig. 11. By displaying the pulse rate using pointer 148, the user can visually grasp the magnitude of the pulse rate from the angle of pointer 148 without having to recognize the numbers.

[0036] Furthermore, in electronic device 100 that does not include pulse rate display unit 145, the display of seconds with second hand 143 may be suspended while the pulse rate is being displayed, and the pulse rate may instead be displayed with second hand 143. In this case, the correspondence between the pulse rate and the scale (the scale corresponding to one second) may be determined arbitrarily. For example, if the step width of second hand 143 when rotating is set to 1 / 4 scale (second) and one scale (for one second) corresponds to a pulse rate of 4 bpm, the scale from 0 to 60 seconds can correspond to a pulse rate of 0 to 240 bpm. Alternatively, if the step width of second hand 143 when rotating is set to 1 / 3 scale (second) and one scale (for one second) corresponds to a pulse rate of 3 bpm, the scale from 0 to 60 seconds can correspond to a pulse rate of 40 to 220 bpm. In these cases, too, the user can visually grasp the magnitude of the pulse rate from the angle of second hand 143 without having to recognize the numbers.

[0037] The reliability index of the pulse rate may be indicated by the vibration (shaking) of the hand 148 (or the second hand 143). For example, the electronic device 100 may not vibrate the hand 148 (or the second hand 143) if the reliability index is 3 (good acquisition accuracy), may vibrate the hand 148 (or the second hand 143) slightly if the reliability index is 2 (normal acquisition accuracy), and may vibrate the hand 148 (or the second hand 143) more strongly if the reliability index is 1 (poor acquisition accuracy), thereby enabling the user to grasp the reliability index. By varying the magnitude of the vibration depending on the reliability index, the user can visually grasp not only the pulse rate but also the reliability of the pulse rate.

[0038] Furthermore, the display of the pulse rate on the pulse rate display unit 145 is not limited to a digital or analog display. The electronic device 100 may display the pulse rate as a graph on the pulse rate display unit 145, as shown in FIG. 12 . By displaying a graph, the user can easily grasp the change in the pulse rate over time. Note that if a graph is displayed on the display unit 140 of a wristwatch-type electronic device 100, the graph may be very small and difficult to read. However, the electronic device 100 may transmit information about the pulse rate and its reliability index to another device such as a smartphone or PC via the communication unit 170, and display the pulse rate as a graph on the other device.

[0039] When the electronic device 100 or the other device displays the pulse rate in a graph, the reliability index may be expressed by changing at least one attribute of whether or not the graph is plotted, the type of line (solid, dotted, dashed, etc.) that plots the graph, the thickness (line width), color, darkness, etc.

[0040] 12, the reliability index for time period tz1 is 3 (good acquisition accuracy), so the graph is plotted with a solid line 301, the reliability index for time period tz2 is 2 (normal acquisition accuracy), so the graph is plotted with a closely spaced dotted line 302, the reliability index for time period tz3 is 1 (poor acquisition accuracy), so the graph is plotted with a widely spaced dotted line 303, and the reliability index for time period tz4 is 3 (good acquisition accuracy), so the graph is plotted with a solid line 304. In this way, the user can grasp the temporal change in pulse rate as well as the temporal change in the reliability of the pulse rate.

[0041] The output modes according to the reliability index of the pulse rate explained above are summarized in a table in Fig. 13. Regarding the magnitude of the vibration of the hand, various settings are possible for the frequency (vibration frequency) and amplitude (amplitude of vibration of the hand), but if the reliability index is 1 (poor acquisition accuracy), processing unit 110 sets the vibration frequency to a first vibration frequency (e.g., 3 Hz) and the amplitude to a first amplitude value (e.g., 2), respectively; if the reliability index is 2 (normal acquisition accuracy), the vibration frequency is set to a second vibration frequency (e.g., 3 Hz) and the amplitude to a second amplitude value (e.g., 1); and if the reliability index is 3 (good acquisition accuracy), the setting is such that the hand is not vibrated (amplitude is 0).

[0042] For example, Figure 14 shows an example in which the pointer does not vibrate if the reliability index is 3 (good acquisition accuracy), and vibrates at a vibration frequency of 3 Hz if the reliability index is 2 (normal acquisition accuracy) or 1 (poor acquisition accuracy), with the pointer's swing range (amplitude) set to ±1 if the reliability index is 2 and ±2 if the reliability index is 1.

[0043] In this embodiment, the output mode is described when the reliability index is divided into three levels, 1 to 3, but using three levels for the reliability index is merely an example. The acquisition accuracy may be divided more finely, and the reliability index may be set to four or more levels. This allows for more precise setting of the size and darkness of the characters displaying the pulse rate, and more precise setting of the vibration frequency of the pointer displaying the pulse rate and the amplitude of the pointer's swing. Conversely, the reliability index may be divided into two levels, 1 (bad) and 2 (good).

[0044] Furthermore, electronic device 100 may not only display the pulse rate on pulse rate display unit 145 (first output unit) in an output mode according to its reliability, but also display a reliability indicator on small hand display unit 146 (second output unit). By displaying the reliability on small hand display unit 146, the user can easily understand the correspondence between the reliability indicator and the "output mode according to the reliability." After understanding this correspondence, the user can simultaneously understand the pulse rate and its reliability simply by looking at pulse rate display unit 145.

[0045] Next, a pulse rate display process in which the electronic device 100 displays the pulse rate in an output format corresponding to its reliability will be described with reference to Fig. 15. The output format may be set in advance (for example, character size) based on the specifications of the pulse rate display unit 145 of the electronic device 100, or may be changeable by a user operation. This pulse rate display process is started when the user instructs the electronic device 100 to display the pulse rate via the operation unit 150. Furthermore, when the electronic device 100 is started, this pulse rate display process may be started in parallel with other processes.

[0046] When the pulse rate display process is started, first, processing unit 110 causes the LED of pulse wave sensor 131 to emit light (step S101). Light emitted from the LED and reflected by the living body is received by the PD of pulse wave sensor 131, and processing unit 110 obtains an AD value obtained by converting the intensity of light received by the PD using an AD converter (step S102).

[0047] The processing unit 110 then calculates the pulse rate and its reliability from the AD value (step S103). Any method can be used to calculate the reliability of the pulse rate from the AD value. For example, the reliability can be calculated based on the magnitude of the change in the AD value (the difference between the maximum and minimum AD values ​​over a predetermined period (e.g., 10 seconds)), the signal-to-noise (SN) ratio, or the like. Because hemoglobin present in blood has the property of absorbing light, the intensity of light received by the PD (=AD value) decreases when the blood flow rate is high. However, when the change in the AD value is small, the difference in the AD value between when the blood flow rate is high and when it is low decreases, making it difficult to detect the pulse. Therefore, the smaller the change in the AD value, the lower the reliability of the pulse rate. Conversely, the greater the change in the AD value, the more accurately the change in the blood flow rate can be grasped, resulting in a higher reliability of the pulse rate. The same is true for the S / N ratio; the higher the S / N ratio, the more accurately changes in blood flow can be grasped, resulting in a more reliable pulse rate. However, if the S / N ratio is low, it becomes difficult to detect the pulse, resulting in a less reliable pulse rate.

[0048] Next, the processing unit 110 converts the reliability into a three-level reliability index (step S104). This three-level conversion method is also arbitrary, but for example, if the reliability is expressed as a numerical value between 0 and 100, the reliability index is set to 1 if the reliability is less than a first threshold (e.g., 50), to 2 if the reliability is equal to or greater than the first threshold and less than a second threshold (e.g., 80), and to 3 if the reliability is equal to or greater than the second threshold.

[0049] Then, the processing unit 110 displays the pulse rate on the pulse rate display unit 145 in an output format according to the reliability index (step S105), and the process returns to step S101.

[0050] By the above pulse rate display process, the electronic device 100 calculates the reliability of the pulse rate and displays the pulse rate on the pulse rate display unit 145 in an output format related to the calculated reliability, so that the user can understand not only the pulse rate but also its reliability just by looking at the pulse rate.

[0051] Next, the needle vibration process, which is a process for displaying the pulse rate in an output mode in which the pointer vibrates according to the reliability index of the pulse rate, will be described with reference to Fig. 16. This needle vibration process is executed in parallel with the pulse rate display process described above when the pulse rate display unit 145 displays the pulse rate using the pointer and displays the pulse rate in an output mode in which the pointer vibrates according to the reliability index of the pulse rate. It is assumed that the vibration frequency and the amplitude of the pointer are stored in advance in the storage unit 120 (as in the example shown in Fig. 14).

[0052] First, the processing unit 110 acquires the pulse rate and reliability index calculated in the pulse rate display process described above (step S201). Then, the processing unit 110 calculates the width MAX and width MIN using the following formulas based on the pulse rate, the reliability index, and the amplitude of the needle (step S202). Maximum width = pulse rate + "variation range relative to the pointer" corresponding to the reliability index Width MIN = Pulse rate - "Variation width relative to the pointer" corresponding to the reliability index

[0053] For example, if the pulse rate is 100 bpm, the reliability index is 1, and the amplitude of the needle is the value shown in FIG. 14, then the amplitude MAX=100+2=102 and the amplitude MIN=100-2=98.

[0054] Next, the processing unit 110 calculates the vibration operating frequency using the following formula based on the width MAX, width MIN and the swing width (amplitude) of the pointer (step S203). Operating frequency during vibration = (maximum width - minimum width) x 2 x vibration frequency The vibration operating frequency is the frequency that advances the pointer by an angle corresponding to a pulse rate of 1. Also, (maximum width - minimum width) is doubled because the pointer moves back and forth between maximum width and minimum width at the frequency set in the "vibration frequency."

[0055] For example, if the maximum width is 102, the minimum width is 98, and the vibration frequency is 3 Hz, the operating frequency during vibration is (102-98) x 2 x 3 = 24 Hz.

[0056] Next, the processing unit 110 fast-forwards the pointer to the MAX or MIN width position based on the current pointer position (step S204). Specifically, the processing unit 110 fast-forwards the pointer to the width MAX or MIN, whichever is closer to the current pointer position (either width is fine if they are the same, but for example, width MIN). For example, if the current pointer position is 90, the MAX width is 102, and the MIN width is 98, the processing unit 110 fast-forwards the pointer to the MIN width position.

[0057] Then, the processing unit 110 determines whether or not the current timing is the vibration-time operating frequency timing (step S205). If the current timing is not the vibration-time operating frequency timing (step S205; No), the processing returns to step S205.

[0058] If it is the vibration operating frequency timing (step S205; Yes), the processing unit 110 determines whether the current pointer position is at the MAX width position (step S206). If the current pointer position is at the MAX width position (step S206; Yes), the processing unit 110 assigns "MaxToMin" to the variable representing the state (step S207), and proceeds to step S210.

[0059] If the current pointer position is not at the width MAX position (step S206; No), the processing unit 110 determines whether the current pointer position is at the width MIN position (step S208). If the current pointer position is at the width MIN position (step S208; Yes), the processing unit 110 assigns "MinToMax" to the variable representing the state (step S209) and proceeds to step S210. If the current pointer position is not at the width MIN position (step S208; No), the processing unit 110 proceeds to step S210.

[0060] In step S210, the processing unit 110 determines whether the value of the variable representing the state is “MaxToMin.” If the value of the variable representing the state is “MaxToMin” (step S210; Yes), the processing unit 110 rotates the pointer to a position that is one position less than the current position (step S211), and proceeds to step S213.

[0061] If the value of the variable representing the state is not "MaxToMin" (step S210; No), the processing unit 110 rotates the pointer to a position that is the current position + 1 (step S212), and proceeds to step S213.

[0062] In step S213, the processing unit 110 determines whether the current timing is the pulse rate update timing (step S213). If it is the pulse rate update timing (step S213; Yes), the processing unit 110 returns to step S201.

[0063] If the current timing is not the pulse rate update timing (step S213; No), the processing unit 110 returns to step S205.

[0064] By the above needle vibration process, the hand vibrates around the current "pulse rate" at the frequency set in the "vibration frequency" and the amplitude set in the "deflection amplitude for the hand" based on the pulse rate reliability index. Therefore, the user can simultaneously grasp the pulse rate and its reliability index by simply checking the hand.

[0065] (Measures to prevent decline in reliability) There are various possible reasons why the reliability of the pulse rate may decrease, but basically, when the AD value is small, that is, when the light intensity received by the PD decreases, the reliability of the pulse rate decreases. There are several possible reasons why the light intensity received by the PD may decrease, but the most common are inappropriate wearing pressure (too tight or too loose) and weak blood flow that reflects the LED light. In addition, when people feel cold, blood vessels near the surface of the body generally constrict, weakening blood flow.

[0066] Since electronic device 100 is equipped with pressure sensor 133 and temperature sensor 134, it can use these to determine whether the wearing pressure is appropriate, whether the ambient temperature is too cold, etc. Electronic device 100 can also obtain meteorological information (temperature, humidity, wind speed, etc.) for the current location from the Internet via communication unit 170 and calculate the sensible temperature outdoors, and can therefore determine whether the calculated sensible temperature is too cold for the user. Therefore, if the reliability of the pulse rate is low, it is possible to infer the cause of the low reliability based on these determination results.

[0067] A countermeasure output process in which electronic device 100 infers the cause of a decrease in the reliability of the pulse rate and outputs a countermeasure to prevent the decrease in reliability will be described with reference to Fig. 17. This countermeasure output process is started when a user instructs electronic device 100 to output a countermeasure to prevent a decrease in reliability via operation unit 150. Furthermore, when electronic device 100 is started up or pulse rate display process is started, this countermeasure output process may be started in parallel with other processes.

[0068] When the countermeasure output process is started, first, the processing unit 110 determines whether the reliability value of the currently acquired pulse rate is less than the reference reliability (for example, 50, assuming that the reliability is a numerical value between 0 and 100) (step S301). If the reliability value is equal to or greater than the reference reliability (step S301; No), the process returns to step S301.

[0069] If the reliability value is less than the reference reliability (step S301; Yes), the processing unit 110 determines whether or not the user is currently performing vigorous exercise based on the acceleration detected by the acceleration sensor 132 (step S302). For example, the processing unit 110 determines that the user is performing vigorous exercise if the acceleration detected by the acceleration sensor 132 (acceleration detection unit) is greater than an acceleration threshold value.

[0070] Next, the processing unit 110 determines whether the pressure detected by the pressure sensor 133 exceeds the upper pressure threshold (step S303). The upper pressure threshold is set in advance as the minimum pressure value at which the electronic device 100 is attached too tightly to the arm, preventing the pulse wave sensor 131 from properly detecting the pulse wave.

[0071] If the pressure detected by the pressure sensor 133 exceeds the upper pressure threshold (step S303; Yes), the processing unit 110 infers that the low reliability is due to tightness of the device, and causes the output unit 155 to output an instruction to loosen the device, such as a voice announcement such as "Please loosen the device" (step S304). At this time, if the processing unit 110 determined in step S302 that the device was "performing vigorous exercise," the instruction content includes content suggesting that high acceleration (exercise) may be the cause. For example, the voice announcement may be "Please loosen the device when exercising." Then, the process returns to step S301.

[0072] If the pressure detected by pressure sensor 133 is equal to or less than the upper pressure threshold (step S303; No), processing unit 110 determines whether the pressure detected by pressure sensor 133 is less than the lower pressure threshold (step S305). The lower pressure threshold is set in advance as the maximum pressure value at which the electronic device 100 is attached too loosely to the arm and pulse wave sensor 131 may not be able to properly detect the pulse wave.

[0073] If the pressure detected by the pressure sensor 133 is less than the lower pressure threshold (step S305; Yes), the processing unit 110 infers that the low reliability is due to loose fitting, and causes the output unit 155 to output a notification instructing the wearer to wear the device tighter, such as a voice announcement such as "Please wear it securely" (step S306). At this time, if the processing unit 110 determined in step S302 that the wearer is "performing vigorous exercise," the notification content includes content suggesting that high acceleration (exercise) may be the cause. For example, the voice announcement may be "Please wear it securely when exercising." Then, the process returns to step S301.

[0074] If the pressure detected by the pressure sensor 133 is equal to or greater than the lower pressure threshold (step S305; No), the processing unit 110 determines whether the temperature detected by the temperature sensor 134 is less than the temperature threshold (step S307). The temperature threshold is set in advance to the highest temperature (e.g., 10°C) at which the user's blood flow may become so small that the pulse wave sensor 131 may not be able to properly detect the pulse wave.

[0075] If the temperature detected by the temperature sensor 134 is below the temperature threshold (step S307; Yes), the processing unit 110 infers that the reason for the low reliability is that the low temperature has reduced blood flow, and causes the output unit 155 to output a notification such as an instruction to increase blood flow, for example, a voice announcement such as "Please warm up and warm up your body" (step S308). At this time, if the processing unit 110 determined in step S302 that "you are performing vigorous exercise," the notification content includes content suggesting that high acceleration (exercise) may be the cause. For example, the voice announcement may be "Make sure to warm up thoroughly before performing vigorous exercise." Then, the process returns to step S301.

[0076] If the temperature detected by the temperature sensor 134 is equal to or higher than the temperature threshold (step S307; No), the processing unit 110 determines whether the current location is outdoors and whether the sensible temperature is below the sensible temperature threshold (step S309). The processing unit 110 can determine whether the current location is outdoors based on whether the position acquisition unit 180 can receive satellite signals. Regarding the sensible temperature, the processing unit 110 acquires climate data (temperature, humidity, wind speed) for the current location (acquired by the position acquisition unit 180) from the Internet via the communication unit 170, and calculates the sensible temperature from the climate data. The sensible temperature threshold is preset to a maximum sensible temperature (e.g., 10°C) at which the user's blood flow may decrease and the pulse wave sensor 131 may not be able to properly detect the pulse wave.

[0077] If the current location is outdoors and the sensible temperature is below the sensible temperature threshold (step S309; ​​Yes), the processing unit 110 infers that the low reliability is due to the low sensible temperature and reduced blood flow, and causes the output unit 155 to output a notification such as an instruction to increase blood flow, for example, a voice announcement such as "Please warm up and warm up your body" (step S310). At this time, if the processing unit 110 determined in step S302 that the user is "performing vigorous exercise," the notification content may include content suggesting that high acceleration (exercise) is the cause. For example, the voice announcement may be "Make sure to warm up thoroughly before engaging in vigorous exercise." Then, the process returns to step S301.

[0078] If the current location is indoors or the sensible temperature is equal to or higher than the sensible temperature threshold (step S309; ​​No), the processing unit 110 determines whether the AD value obtained from the pulse wave sensor 131 is less than the AD threshold (step S311). The AD threshold is preset to a maximum value at which the AD value is too small and the pulse rate may not be calculated properly.

[0079] If the AD value obtained from the pulse wave sensor 131 is less than the AD threshold (step S311; Yes), the processing unit 110 infers that the low reliability is due to improper wearing, and causes the output unit 155 to output a notification such as an instruction to encourage proper wearing, for example, a voice announcement such as "Please wear it securely" (step S312). At that time, if the processing unit 110 determined in step S302 that "you are performing vigorous exercise," the notification content includes content suggesting that high acceleration (exercise) may be the cause. For example, the voice announcement may be "Please wear it securely when exercising." Then, the process returns to step S301.

[0080] If the AD value obtained from the pulse wave sensor 131 is equal to or greater than the AD threshold (step S311; No), the processing unit 110 infers that the cause of the low reliability is unknown, and causes the output unit 155 to output a notification such as general instructions on countermeasures, for example, a voice announcement such as "Please wear the device properly and warm up to keep your body warm" (step S313). At this time, if the processing unit 110 determined in step S302 that the user is "exercising vigorously," the notification content includes content suggesting that high acceleration (exercise) may be the cause. For example, the voice announcement may be "Please wear the device properly when exercising and warm up thoroughly." Then, the process returns to step S301.

[0081] Through the above countermeasure output process, electronic device 100 infers the cause of the decrease in the reliability of the pulse rate and outputs a notification related to the inferred cause (e.g., a countermeasure to prevent the reliability from decreasing). By following the output countermeasure, the user can improve the reliability of the pulse rate. Furthermore, because the countermeasure is announced by voice, the user can understand the countermeasure without checking display unit 140. Furthermore, since the determination in step S308 and subsequent steps is made after determining that there is no problem with the attachment pressure in steps S303 to S306, if multiple causes are considered to be the cause of the decrease in reliability, the user is first prompted to attach the device correctly. In this way, even if there are multiple causes, the causes can be steadily eliminated one by one.

[0082] Note that the electronic device 100 may include a body temperature sensor that measures the user's body temperature, instead of or in addition to the temperature sensor 134 that measures the ambient air temperature. In this case, in the countermeasure output process, the processing unit 110 determines whether the body temperature measured by the body temperature sensor is below a body temperature threshold (e.g., 35°C). If the body temperature is below the body temperature threshold, the processing unit 110 infers that the reason for the low reliability is that the body temperature is low and blood flow is reduced, and causes the output unit 155 to output a notice such as an instruction to increase blood flow, for example, a voice announcement such as "Please warm up and warm your body."

[0083] Furthermore, electronic device 100 may include a sound output unit that outputs sound effects, and the type of sound output from the sound output unit may indicate the cause of the decrease in reliability. For example, if it is estimated that the device is too tight, a sound effect indicating that the device is too tight (e.g., a "beep") may be output; if it is estimated that the device is too loose, a sound effect indicating that the device is loose (e.g., a "beep") may be output; and if it is estimated that the temperature is low, a sound effect indicating that the temperature is low (e.g., a "boo"). By outputting sound effects instead of voice announcements, it is possible to reduce the manufacturing costs of electronic device 100 and the processing load of processing unit 110. Even with such simple sound effects, if a user hears a "beep" sound, they can take measures such as thinking, "Since the device is loose, it seems I should tighten it up."

[0084] Furthermore, the output of electronic device 100 is not limited to audio announcements and sound effects. Electronic device 100 may be provided with, for example, a character display unit capable of displaying characters, and measures may be displayed on the character display unit. By displaying measures on the character display unit, the user can understand measures to prevent a decrease in reliability even in a situation where the audio announcement cannot be heard, such as in a noisy environment.

[0085] Furthermore, electronic device 100 may include a vibration unit that vibrates electronic device 100 as output unit 155, and the type of vibration produced by the vibration unit may indicate the cause of the decrease in reliability. For example, if it is estimated that the device is worn too tightly, it may vibrate (e.g., "buzz") to indicate that the device is worn too tightly; if it is estimated that the device is worn too loosely, it may vibrate (e.g., "buzz") to indicate that the device is worn loosely; and if it is estimated that the temperature is low, it may vibrate (e.g., "buzz") to indicate that the temperature is low. By vibrating instead of issuing a voice announcement, the processing load of processing unit 110 can be reduced, and the user can take measures to prevent a decrease in reliability even in noisy situations.

[0086] Furthermore, electronic device 100 may include a light-emitting unit (e.g., an LED) as output unit 155, and the type of light emitted by the light-emitting unit may indicate the cause of the reliability degradation. For example, if it is estimated that the device is too tight, it may emit light indicating that the device is too tight (e.g., by repeatedly lighting for 0.1 seconds at 0.1 second intervals); if it is estimated that the device is too loose, it may emit light indicating that the device is loose (e.g., by repeatedly lighting for 0.5 seconds at 0.5 second intervals); and if it is estimated that the temperature is low, it may emit light indicating that the temperature is low (e.g., by repeatedly lighting for 1 second at 1 second intervals). By emitting light instead of issuing a voice announcement, the processing load of processing unit 110 can be reduced, and the user can take measures to prevent reliability degradation by checking the type of light emitted, even in noisy situations.

[0087] Furthermore, if the electronic device 100 does not have an acceleration sensor 132, the processing of step S302 does not need to be performed, and in this case, the notification to the user in steps S304, S306, S308, S310, S312, and S313 does not need to include content suggesting that high acceleration (exercise) may be the cause.

[0088] Furthermore, if the electronic device 100 does not include the pressure sensor 133, the processes of steps S303 to S306 do not need to be performed.

[0089] Furthermore, if the electronic device 100 does not include the temperature sensor 134, the processes of steps S307 and S308 do not need to be performed.

[0090] Furthermore, if the electronic device 100 does not include the communication unit 170 and the position acquisition unit 180, the processes of steps S309 and S310 do not need to be performed.

[0091] In the embodiment described above, electronic device 100 calculates the pulse rate and its reliability based on the AD value obtained from the output value of PD, and displays the pulse rate in an output format corresponding to the reliability. However, the information output by electronic device 100 is not limited to the pulse rate. For example, pulse wave sensor 131 can also measure arterial blood oxygen saturation (SpO2) using two wavelengths, infrared and red light, but the reliability of this measurement also decreases under the same conditions as the pulse rate (e.g., inappropriate attachment pressure). Therefore, electronic device 100 can display the user's arterial blood oxygen saturation in an output format corresponding to the reliability, or output measures to prevent the reliability from decreasing.

[0092] In addition, electronic device 100 may increase or decrease the number of sensors included in sensor unit 130 as needed, and may display any biometric information obtained from sensor unit 130 in an output format corresponding to its reliability, or output measures to prevent a decrease in reliability.

[0093] Furthermore, information obtained from the sensor unit 130 (for example, the AD value obtained from the pulse wave sensor 131), pulse rate, arterial blood oxygen saturation, etc. calculated based on information from the sensor unit 130 are biological information, but various other information that can be calculated from these pieces of information (for example, stress level, vascular age) can also be considered biological information. The electronic device 100 may output any of these pieces of biological information in an output format according to its reliability.

[0094] In this case as well, the reliability of the given biometric information can be calculated based on the reliability of the information used for the calculation (originally information from the sensor unit 130 such as AD values), so the electronic device 100 can display the given biometric information in an output format according to its reliability. And, since the reliability of the given biometric information depends on the reliability of the information used for the calculation (for example, AD values), the electronic device 100 can output measures to prevent a decrease in reliability by processing similar to the above-mentioned measures output processing.

[0095] Furthermore, the electronic device 100 does not necessarily output the biometric information in the form of a display on a display unit. The electronic device 100 may output the biometric information, for example, by voice, in an output mode according to the reliability of the biometric information. When outputting by voice, for example, the electronic device 100 may output the biometric information in an unclear voice when the reliability of the biometric information is low, and output the biometric information in a clear voice when the reliability is high.

[0096] The electronic device 100 can also be realized by a wearable computer that can be worn on the user's body, or a computer such as a smartphone, tablet, or PC that can acquire detection values ​​detected by sensors worn on the user's body. Specifically, in the above embodiment, the program for the pulse rate display process and the like executed by the electronic device 100 has been described as being pre-stored in the storage unit 120. However, the program may be stored and distributed on a computer-readable recording medium such as a flexible disk, a CD-ROM (Compact Disc Read Only Memory), a DVD (Digital Versatile Disc), an MO (Magneto-Optical disc), a memory card, or a USB memory, and the program may be read and installed on a computer to configure a computer that can execute each of the above-mentioned processes.

[0097] Furthermore, the program may be superimposed on a carrier wave and applied via a communication medium such as the Internet. For example, the program may be posted and distributed on a bulletin board system (BBS) on a communication network. The program may then be started and executed under the control of an operating system (OS) in the same way as other application programs, thereby enabling the above-described processes to be performed.

[0098] In addition, the processing unit 110 may be configured by any single processor such as a single processor, multiprocessor, or multi-core processor, or may be configured by combining any of these processors with processing circuits such as an ASIC (Application Specific Integrated Circuit) or FPGA (Field-Programmable Gate Array).

[0099] While the preferred embodiments of the present invention have been described above, the present invention is not limited to such specific embodiments, and includes the inventions set forth in the claims and their equivalents. The inventions set forth in the original claims of this application are set forth below.

[0100] (Appendix 1) a first detection unit that detects biometric information that is information about a living body; a second detection unit that detects information other than the biological information detected by the first detection unit; a processing unit; Equipped with The processing unit calculating reliability of the biometric information based on the biometric information detected by the first detection unit; If the calculated reliability is lower than the reference reliability, a reason why the reliability is lower than the reference reliability is inferred based on the information detected by the second detection unit. electronic equipment.

[0101] (Appendix 2) The processing unit outputting a notification related to the inferred cause; 1. The electronic device described in Appendix 1.

[0102] (Appendix 3) the second detection unit detects a pressure at which the electronic device is attached to the living body; The processing unit If the pressure detected by the second detection unit is greater than the upper pressure threshold, it is inferred that the reason why the reliability is less than the reference reliability is that the wearing is too tight, If the pressure detected by the second detection unit is smaller than the lower pressure threshold, it is inferred that the reason why the reliability is lower than the reference reliability is because the wearing is loose. 3. An electronic device according to claim 1 or 2.

[0103] (Appendix 4) the second detection unit detects an ambient temperature of the electronic device; The processing unit If the temperature detected by the second detection unit is lower than the temperature threshold, it is inferred that the reason why the reliability is lower than the reference reliability is because the temperature is low. 4. The electronic device according to any one of claims 1 to 3.

[0104] (Appendix 5) The second detection unit acquires a pressure at which the electronic device is attached to the living body and an ambient temperature of the living body, The processing unit If the pressure detected by the second detection unit is greater than the upper pressure threshold, it is inferred that the reason why the reliability is less than the reference reliability is that the wearing is too tight, If the pressure detected by the second detection unit is smaller than the lower pressure threshold, it is inferred that the reason why the reliability is lower than the reference reliability is because the wearing is loose, If the pressure detected by the second detection unit is equal to or greater than the lower pressure threshold and equal to or less than the upper pressure threshold, and if the air temperature detected by the second detection unit is lower than the air temperature threshold, it is inferred that the reason why the reliability is lower than the reference reliability is because the air temperature is low. 3. An electronic device according to claim 1 or 2.

[0105] (Appendix 6) a location acquisition unit that acquires a current location; The Communications Department and Furthermore, The processing unit If the current location acquired by the location acquisition unit is outdoors, the communication unit acquires weather information about the current location; Calculating the perceived temperature from the acquired weather information; If the calculated sensible temperature is smaller than the sensible temperature threshold, it is inferred that the reason why the reliability is lower than the reference reliability is that the sensible temperature is low. 6. The electronic device according to any one of claims 1 to 5.

[0106] (Appendix 7) an acceleration detection unit for detecting acceleration; If the acceleration detected by the acceleration detection unit is greater than an acceleration threshold, it is inferred that the reason why the reliability is less than the reference reliability is that the acceleration is large. 7. The electronic device according to any one of claims 1 to 6.

[0107] (Appendix 8) an output unit for outputting audio; The processing unit When the cause of the reliability being lower than the reference reliability is inferred, measures to eliminate the inferred cause are output by voice from the output unit. 8. The electronic device of any one of appendices 1 to 7.

[0108] (Appendix 9) an output unit that outputs sound effects; The processing unit When a reason why the reliability is less than the reference reliability is inferred, a sound effect corresponding to the inferred reason is output from the output unit. 9. The electronic device of any one of appendices 1 to 8.

[0109] (Appendix 10) a vibration unit that vibrates the electronic device, The processing unit When a reason why the reliability is lower than the reference reliability is inferred, the electronic device is vibrated by the vibration unit in accordance with the inferred reason. 10. The electronic device of any one of appendices 1 to 9.

[0110] (Appendix 11) The biological information is a heart rate. 11. The electronic device of any one of appendices 1 to 10.

[0111] (Appendix 12) A method for estimating a cause of a decrease in reliability in an electronic device including a first detection unit that detects biometric information that is information about a living body, a second detection unit that detects information other than the biometric information detected by the first detection unit, and a processing unit, The processing unit calculating reliability of the biometric information based on the biometric information detected by the first detection unit; If the calculated reliability is lower than the reference reliability, a reason why the reliability is lower than the reference reliability is inferred based on the information detected by the second detection unit. A method for predicting the cause of reliability decline.

[0112] (Appendix 13) A computer of an electronic device including a first detection unit that detects biometric information that is information about a living body, a second detection unit that detects information other than the biometric information detected by the first detection unit, and a processing unit, calculating reliability of the biometric information based on the biometric information detected by the first detection unit; If the calculated reliability is lower than the reference reliability, a reason why the reliability is lower than the reference reliability is inferred based on the information detected by the second detection unit. A program that executes a process. [Explanation of symbols]

[0113] 100...electronic device, 110...processing unit, 120...storage unit, 130...sensor unit, 131...pulse wave sensor, 132...acceleration sensor, 133...pressure sensor, 134...temperature sensor, 140...display unit, 141...hour hand, 142...minute hand, 143...second hand, 144...date indicator, 145...pulse rate display unit, 146...small hand display unit, 148...hand, 150...operation unit, 151...crown, 152, 153...push button switch, 155...output unit, 160...timekeeping unit, 170...communication unit, 180...position acquisition unit, 201, 202, 203...mark, 301, 304...solid line, 302, 303...dotted line, tz1, tz2, tz3, tz4...time zone

Claims

1. a first detection unit that detects biometric information that is information about a living body; a second detection unit that detects information other than the biological information detected by the first detection unit; a display unit that displays the detected biological information in text or graphs; a processing unit; Equipped with The processing unit calculating reliability of the biometric information based on the biometric information detected by the first detection unit; If the calculated reliability is less than the reference reliability, inferring a reason why the reliability is less than the reference reliability based on the information detected by the second detection unit; When the reliability is low, the characters or graphs are displayed on the display unit in a manner that makes them less visible than when the reliability is high. electronic equipment.

2. The processing unit outputting a notification related to the inferred cause; The electronic device according to claim 1 .

3. the second detection unit detects a pressure at which the electronic device is attached to the living body; The processing unit If the pressure detected by the second detection unit is greater than the upper pressure threshold, it is inferred that the reason why the reliability is less than the reference reliability is that the wearing is too tight, If the pressure detected by the second detection unit is smaller than the lower limit pressure threshold, it is inferred that the reason why the reliability is lower than the reference reliability is because the wearing is loose.

3. The electronic device according to claim 1 or 2.

4. the second detection unit detects an ambient temperature of the electronic device; The processing unit If the temperature detected by the second detection unit is lower than the temperature threshold, it is inferred that the reason why the reliability is lower than the reference reliability is because the temperature is low. The electronic device according to claim 1 .

5. The second detection unit acquires a pressure at which the electronic device is attached to the living body and an ambient temperature of the living body, The processing unit If the pressure detected by the second detection unit is greater than the upper pressure threshold, it is inferred that the reason why the reliability is less than the reference reliability is that the wearing is too tight, If the pressure detected by the second detection unit is smaller than the lower pressure threshold, it is inferred that the reason why the reliability is lower than the reference reliability is that the wearing is loose, If the pressure detected by the second detection unit is equal to or greater than the lower pressure threshold and equal to or less than the upper pressure threshold, and if the air temperature detected by the second detection unit is lower than the air temperature threshold, it is inferred that the reason why the reliability is lower than the reference reliability is because the air temperature is low.

3. The electronic device according to claim 1 or 2.

6. a location acquisition unit that acquires a current location; The Communications Department and Furthermore, The processing unit If the current location acquired by the location acquisition unit is outdoors, the communication unit acquires weather information about the current location; Calculating the perceived temperature from the acquired weather information; If the calculated sensible temperature is smaller than the sensible temperature threshold, it is inferred that the reason why the reliability is lower than the reference reliability is that the sensible temperature is low. The electronic device according to claim 1 .

7. an acceleration detection unit for detecting acceleration; If the acceleration detected by the acceleration detection unit is greater than an acceleration threshold, it is inferred that the reason why the reliability is less than the reference reliability is that the acceleration is large. The electronic device according to claim 1 .

8. an output unit for outputting audio; The processing unit When the cause of the reliability being lower than the reference reliability is inferred, measures to eliminate the inferred cause are output by voice from the output unit. The electronic device according to claim 1 .

9. an output unit that outputs sound effects; The processing unit When a reason why the reliability is less than the reference reliability is inferred, a sound effect corresponding to the inferred reason is output from the output unit. The electronic device according to claim 1 .

10. a vibration unit that vibrates the electronic device, The processing unit When a reason why the reliability is lower than the reference reliability is inferred, the electronic device is vibrated by the vibration unit in accordance with the inferred reason. The electronic device according to claim 1 .

11. The biological information is a heart rate. The electronic device according to claim 1 .

12. A method for estimating a cause of reliability degradation in an electronic device including a first detection unit that detects biometric information that is information about a living body, a second detection unit that detects information other than the biometric information detected by the first detection unit, a display unit that displays the detected biometric information using characters or graphs, and a processing unit, The processing unit calculating reliability of the biometric information based on the biometric information detected by the first detection unit; If the calculated reliability is less than the reference reliability, inferring a reason why the reliability is less than the reference reliability based on the information detected by the second detection unit; When the reliability is low, the characters or graphs are displayed on the display unit in a manner that makes them less visible than when the reliability is high. A method for predicting the cause of reliability decline.

13. a display unit that displays the detected biometric information in the form of characters or graphs; a processor that displays the detected biometric information in the form of characters or graphs; a display unit that displays the detected biometric information in the form of characters or graphs; a processor that displays the detected biometric information in the form of characters or graphs; calculating reliability of the biometric information based on the biometric information detected by the first detection unit; If the calculated reliability is less than the reference reliability, inferring a reason why the reliability is less than the reference reliability based on the information detected by the second detection unit; When the reliability is low, the characters or graphs are displayed on the display unit in a manner that makes them less visible than when the reliability is high. A program that executes a process.

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