JP2012196332A - Body motion detecting device and method for controlling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To determine the posture of a user regardless of a held position.SOLUTION: The body motion detecting device determines whether or not a body part makes the behavior while the user is walking or running based on the detected acceleration (steps S116 and S124), stores the direction of the body part when it is determined that the body part makes the behavior while the user is walking or running (a step S128), and determines the posture of the user based on the stored direction (from a step S131 to a step S135).

Description

  The present invention relates to a body motion detection device and a control method for the body motion detection device, and in particular, includes a main body, a detection unit that detects acceleration in a plurality of directions of the main body, a control unit, and a storage unit. The present invention relates to a body motion detection device that detects a body motion of a user who holds a main body portion at a predetermined site, and a control method for controlling the body motion detection device.

  Conventionally, there has been an action determination device that determines a user's movement based on a ratio of acceleration between a horizontal direction and a vertical direction (see, for example, Patent Document 1). Further, there has been a technique for counting the number of steps when the magnitude of acceleration in the vertical direction exceeds a certain value, as in a conventional pedometer.

JP 2010-17525 A

  However, there is nothing that determines the user's standing state from the acceleration during walking. For this reason, in a pedometer of the type that can be put in a pocket, body movement can be detected from the magnitude of acceleration in each of the three-dimensional axes, but since the user's posture is unknown, for example, standing and sitting in cases other than walking There was a problem that it could not be judged.

  For this reason, since the posture etc. which are sitting on the bicycle cannot be determined, movements other than walking are erroneously counted. In addition, the amount of activity differs between standing and sitting even at the same rest, but they cannot be measured accurately.

  The present invention has been made in order to solve the above-mentioned problems, and one of its purposes is not limited to the holding position, and a body motion detection device capable of determining a user's posture, and a body It is to provide a method for controlling a motion detection device.

  In order to achieve the above object, according to one aspect of the present invention, a body motion detection device includes a main body, a detection unit that detects acceleration in a plurality of directions of the main body, a control unit, and a storage unit. It is an apparatus for detecting body movement of a user who is equipped and holds a main body part at a predetermined part.

  Based on the acceleration detected by the detection unit, the control unit determines whether or not the main body is performing a behavior when the user is walking or running, and the user walks with the motion determination unit. Alternatively, the user's posture is determined based on the storage control unit that stores in the storage unit the orientation of the main body when it is determined to behave when traveling, and the orientation stored in the storage unit A posture determination unit.

  Preferably, the control unit further includes a component determination unit that determines whether or not the ratio of the low frequency component in the temporal change in acceleration detected by the detection unit is larger than the high frequency component. When the component determination unit determines that the ratio of the low frequency component is large, the motion determination unit indicates the behavior when the user is walking or running as the first continuous motion with relatively large vertical movement. On the other hand, if it is determined that the ratio of the low-frequency component is small, the main body portion has the behavior when the user is performing the second continuous motion with relatively small vertical movement. judge.

  Preferably, the control unit further includes an angle formed between the inclination of the main body unit with respect to the predetermined reference when the movement determination unit determines that the movement is the first continuous movement and the inclination of the main body unit with respect to the predetermined reference at the time of determination. An inclination determination unit that determines whether or not the angle is larger than the predetermined angle is provided. The exercise determination unit further determines whether or not the main body is performing a behavior when the user is moving. When it is determined by the motion determination unit that the body is not moving by the motion determination unit, the posture determination unit determines that the posture of the user is smaller than a predetermined angle by the inclination determination unit. While it is determined that the user is in the standing position, if the inclination determining unit determines that the angle is larger than the predetermined angle, the user's posture is determined to be different from the standing position.

  Preferably, the body motion detection device further includes an output unit that outputs predetermined information. The control unit further includes an output control unit that controls the output unit to output information based on the determination results of the motion determination unit and the posture determination unit.

  More preferably, the component determination unit has a predetermined value obtained by dividing the first value not removing the low frequency component from the combined acceleration detected by the detection unit by the second value excluding the low frequency component. It is determined whether or not the ratio of the low frequency component is larger than the high frequency component.

  According to another aspect of the present invention, a method for controlling a body motion detection apparatus includes a main body, a detection unit that detects acceleration in a plurality of directions of the main body, a control unit, and a storage unit. This is a control method for controlling a body motion detection device that detects a body motion of a user held in a predetermined part.

  The control method of the body motion detection device includes a step in which the control unit determines whether or not the main body is performing a behavior when the user is walking or running based on the acceleration detected by the detection unit; Based on the step of storing in the storage unit the orientation of the main body when it is determined that the user is walking or running, the orientation of the user is determined based on the orientation stored in the storage unit. Determining.

  According to this invention, based on the detected acceleration, it is determined by the body motion detection device whether or not the main body has a behavior when the user is walking or running, and the user walks or runs. The orientation of the main body when it is determined that the user is behaving is stored, and the posture of the user is determined based on the stored orientation. For this reason, the posture of the user is determined based on the direction of the body motion detection device when walking or running. As a result, it is possible to provide a body motion detection device capable of determining the posture of the user without being limited to the position to be held, and a method for controlling the body motion detection device.

It is an external view of the active mass meter in embodiment of this invention. It is a figure which shows the 1st use condition of the active mass meter in this embodiment. It is a figure which shows the 2nd use condition of the active mass meter in this embodiment. It is a figure which shows the 3rd use condition of the active mass meter in this embodiment. It is a block diagram which shows the outline of a structure of the active mass meter in this embodiment. It is a flowchart which shows the flow of the exercise amount calculation process performed by the control part of the active mass meter in this embodiment. It is a figure for demonstrating the relationship between the angle used as the horizontal plane of the axis | shaft of the acceleration sensor of the active mass meter in this embodiment, and the value of the gravitational acceleration applied to the axial direction. It is a figure which shows the correspondence of the angle which two directions make, and the sine of the angle. It is a graph which shows an example of the change of the acceleration for every axis | shaft detected with the acceleration sensor of the active mass meter in this embodiment. It is a graph which shows an example of the change of the acceleration for every axis | shaft at the time of the walk before being detected with the acceleration sensor of the active mass meter in this embodiment, and being signal-processed with a high-pass filter. It is a graph which shows an example of the change of the acceleration for each axis at the time of the walk after being detected with the acceleration sensor of the active mass meter in this embodiment, and being signal-processed with a high pass filter. It is a graph which shows an example of the change of the acceleration for every axis | shaft at the time of the bicycle driving | running | working before being detected with the acceleration sensor of the active mass meter in this embodiment, and being signal-processed with a high pass filter. It is a graph which shows an example of the change of the acceleration for each axis at the time of the bicycle driving | running | working after detecting with the acceleration sensor of the active mass meter in this embodiment, and signal-processing with the high pass filter. It is a figure which shows the direction of the synthetic | combination acceleration at the time of the walk in this embodiment, and a sensor angle, and the direction of an active mass meter. It is a figure which shows the direction of the synthetic | combination acceleration at the time of bicycle driving | running | working in this embodiment, and a sensor angle, and the direction of an active mass meter. It is a figure which shows the direction of the synthetic | combination acceleration at the time of standing still in this embodiment, and the change of a sensor angle, and the direction of an active mass meter. It is a figure which shows the direction of the synthetic | combination acceleration at the time of sitting still position and sensor angle in this embodiment, and the direction of an active mass meter.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the same or corresponding parts in the drawings are denoted by the same reference numerals and description thereof will not be repeated.

  In the present embodiment, the body motion detection device measures not only the number of steps but also the amount of activity (also referred to as the amount of exercise) in exercise and daily activities (for example, vacuuming, carrying light luggage, cooking, etc.). The embodiment will be described as an activity meter capable of

  FIG. 1 is an external view of an activity meter 100 according to the embodiment of the present invention. With reference to FIG. 1, the activity meter 100 is mainly composed of a main body portion 191 and a clip portion 192. The clip unit 192 is used to fix the activity meter 100 to a user's clothes or the like.

  The main body 191 includes a display change / decision switch 131, a left operation / memory switch 132, a right operation switch 133, and a part of a display unit 140, which will be described later. A display 141 is provided.

  In the present embodiment, display 141 is configured with a liquid crystal display (LCD), but is not limited thereto, and may be another type of display such as an EL (ElectroLuminescence) display. .

  FIG. 2 is a diagram showing a first usage state of the activity meter 100 in this embodiment. FIG. 3 is a diagram showing a second usage state of the activity meter 100 according to this embodiment. FIG. 4 is a diagram showing a third usage state of the activity meter 100 in this embodiment.

  With reference to FIG. 2 to FIG. 4, the activity meter 100 is held non-fixedly in a state of being placed in a user's pants pocket, for example. Alternatively, the activity meter 100 is fixedly attached to the belt on the user's waist using the clip portion 192, for example.

  Note that the activity meter 100 is not limited to this, and may be designed to be used while being fixedly or non-fixedly held in other parts of the user's body.

  FIG. 5 is a block diagram showing an outline of the configuration of the activity meter 100 in this embodiment. Referring to FIG. 5, activity meter 100 includes a control unit 110, a memory 120, an operation unit 130, a display unit 140, an acceleration sensor 170, a high-pass filter 180, and a power source 190. Further, the activity meter 100 may include a sound report unit for outputting sound and an interface for communicating with an external computer.

  The control unit 110, the memory 120, the operation unit 130, the display unit 140, the acceleration sensor 170, the high-pass filter 180, and the power source 190 are incorporated in the main body unit 191 described with reference to FIG.

  The operation unit 130 includes the display change / decision switch 131, the left operation / memory switch 132, and the right operation switch 133 described with reference to FIG. 1, and an operation signal indicating that these switches have been operated is sent to the control unit 110. Send.

  The acceleration sensor 170 is a semiconductor type of MEMS (Micro Electro Mechanical Systems) technology, but is not limited to this, and may be of another type such as a mechanical type or an optical type. In the present embodiment, acceleration sensor 170 outputs a detection signal indicating acceleration in each of the three axial directions to control unit 110 and high-pass filter 180. However, the acceleration sensor 170 is not limited to the three-axis type, and may be one-axis or two-axis type.

  The high-pass filter 180 attenuates a signal in a frequency band lower than the cut-off frequency (2 Hz in the present embodiment) in the detection signal from the acceleration sensor 170, and sends the signal in the high frequency band to the control unit 110. Output. Note that the cutoff frequency may be another value.

  The memory 120 includes non-volatile memory such as ROM (Read Only Memory) (for example, flash memory) and volatile memory such as RAM (Random Access Memory) (for example, SDRAM (synchronous Dynamic Random Access Memory)).

  The memory 120 includes program data for controlling the activity meter 100, data used for controlling the activity meter 100, setting data for setting various functions of the activity meter 100, and the number of steps and activities. Measurement result data such as quantity is stored every predetermined time (for example, every day). The memory 120 is used as a work memory when the program is executed.

  Control unit 110 includes a CPU (Central Processing Unit), and according to an operation signal from operation unit 130 according to a program for controlling activity meter 100 stored in memory 120, acceleration sensor 170 and high-pass filter 180. The memory 120 and the display unit 140 are controlled on the basis of the detection signal from.

  The display unit 140 includes the display 141 described with reference to FIG. 1 and controls the display 141 to display predetermined information according to a control signal from the control unit 110.

  The power source 190 includes a replaceable battery, and supplies power from the battery to each unit that requires power to operate, such as the control unit 110 of the activity meter 100.

  FIG. 6 is a flowchart showing the flow of the exercise amount calculation process executed by the control unit 110 of the activity meter 100 in this embodiment. This momentum calculation process is executed at a predetermined period (for example, every sampling period of the detection value of the acceleration sensor).

  Referring to FIG. 6, first, in step S111, control unit 110 reads a detection value indicated by a detection signal of each axis of acceleration sensor 170, and calculates acceleration Xa, Ya, Za in each axis direction from the detection value. It is calculated and stored in the memory 120 as the value at that time.

  In step S112, control unit 110 calculates average values Xavg, Yavg, Zavg of accelerations Xa, Ya, Za for the past predetermined seconds (for example, 60 seconds).

  In step S113, the control unit 110 calculates components Xg, Yg, and Zg of gravity acceleration in each axial direction from the Xavg, Yavg, and Zavg calculated in step S112. In the present embodiment, in the past predetermined seconds (for example, 60 seconds), the direction of each axis is substantially constant, and one cycle is considerably shorter than the predetermined seconds (for example, one cycle is a predetermined second). 1/10 (for example, 6 seconds or less movement) was performed (for example, continuous movement such as walking, running, and cycling) was performed, or almost stationary, Xg = Xavg, Yg = Yavg, Zg = Zavg.

  In addition, the calculation method of Xg, Yg, Zg may be another method. For example, the predetermined seconds, which are the above averaged ranges, are changed in accordance with the degree of time change of Xa, Ya, Za, and Xavg, Yavg, Zavg of the predetermined seconds are changed to Xg, It may be calculated as Yg and Zg. Specifically, for each of Xa, Ya, and Za, when the degree of time change is a predetermined small range, the predetermined second is 60 seconds, and when the degree of time change is a predetermined medium range, predetermined When the second is 30 seconds and the degree of time change is within a predetermined large range, the predetermined second is 10 seconds. Moreover, it is good also as cycle units, such as 60 cycles, 30 cycles, and 10 cycles, not 60 seconds, 30 seconds, and 10 seconds.

  Further, Xg, Yg, and Zg may be calculated by predicting from changes in Xavg, Yavg, and Zavg in the past predetermined seconds. Specifically, the change rate of the change of Xavg, Yavg, Zavg calculated this time since the previous calculation is multiplied by the previously calculated Xg, Yg, Zg, respectively, is calculated as the current Xg, Yg, Zg. Like that.

  When the time of one cycle of exercise can be predicted, the average value of Xa, Ya, Za of one cycle may be calculated as Xg, Yg, Zg, respectively. In this case, if one cycle of motion is long or one cycle cannot be specified, and the combined acceleration of Xa, Ya, Za is a relatively small value (close to gravity acceleration), a past short range (for example, Xavg, Yavg, and Zavg for several seconds may be calculated as Xg, Yg, and Zg, respectively. Furthermore, when one cycle of movement is long or one cycle cannot be specified and the combined acceleration of Xa, Ya, Za is a relatively large value, Xavg, Yavg, Zavg may be calculated as Xg, Yg, and Zg, respectively.

  Next, in step S114, the control unit 110 calculates a composite acceleration Sa according to the following equation (1) based on Xavg, Yavg, Zavg calculated in step S112 and Xg, Yg, Zg calculated in step S113. To do.

  Next, in step S115, the control unit 110 calculates angles θx, θy, and θz formed by the axes of the acceleration sensor 170 with the horizontal plane based on Xg, Yg, and Zg calculated in step S113.

  FIG. 7 is a view for explaining the relationship between the angle of the horizontal plane of the axis of the acceleration sensor 170 of the activity meter 100 in this embodiment and the value of the gravitational acceleration applied to the axial direction. FIG. 8 is a diagram illustrating a correspondence relationship between an angle formed by two directions and a sine of the angle. Referring to FIGS. 7 and 8, when the angle formed by the horizontal plane of the axis of acceleration sensor 170 is 30 °, the gravitational acceleration applied in the axial direction is 0.5 G. Further, when the angle of the axis of the acceleration sensor 170 that is the horizontal plane is 90 °, the gravitational acceleration applied in the axial direction is 1G.

  Returning to FIG. 6, according to the relationship described in FIGS. 7 and 8, each axis of the acceleration sensor becomes a horizontal plane based on Xg, Yg, Zg calculated in step S113 according to the following formula (2). The angles θx, θy, and θz can be calculated.

  In step S116, the controller 110 determines whether or not the resultant acceleration Sa calculated in step S114 is less than 0.1 (Sa <0.1), that is, in a stationary state or a substantially stationary state. Judge whether there is.

  When it is determined that the resultant acceleration Sa is not less than 0.1 (when it is determined NO at step S116), that is, when it is determined that neither the stationary state nor the substantially stationary state is found, at step S121. The control unit 110 reads a value obtained by applying the detection value indicated by the detection signal of each axis of the acceleration sensor 170 to the high-pass filter 180, and uses the low-frequency components Xb, Yb, Zb of the acceleration in each axis direction from the value. calculate.

  Next, in step S122, the control unit 110 calculates average values Xbavg, Ybavg, Zbavg of accelerations Xb, Yb, Zb for the past predetermined seconds (for example, 60 seconds).

  Next, in step S123, the control unit 110 calculates a composite acceleration Sb according to the following equation (3) based on Xbavg, Ybavg, Zbavg calculated in step S122 and Xg, Yg, Zg calculated in step S113. .

  In step S124, the control unit 110 determines whether or not the value obtained by dividing Sa calculated in step S114 by Sb calculated in step S123 is larger than 1.5 (Sa / Sb> 1.5), that is, a change in acceleration with time. It is determined whether the ratio of the low frequency component is relatively larger than the high frequency component.

  When it is determined that Sa / Sb> 1.5 is not satisfied (when NO is determined in step S124), that is, when it is determined that the ratio of the low frequency component of the temporal change in acceleration is not relatively larger than the high frequency component, step S126. Thus, the control unit 110 specifies the exercise state as walking or running.

  Next, in step S127, the control unit 110 calculates the cycle of one cycle of movement based on the latest Xa, Ya, Za stored in the memory 120, and estimates the walking or running speed v from the cycle. To do.

  Next, in step S128, the control unit 110 stores θx, θy, and θz calculated in step S115 in the memory 120 as angles θsx, θsy, and θsz formed by the respective axes of the acceleration sensor in the standing position with the horizontal plane. Thereafter, the control unit 110 advances the process to be executed to the process of step S141.

  On the other hand, when it is determined that Sa / Sb> 1.5 (when YES is determined in step S124), that is, when it is determined that the ratio of the low frequency component of the temporal change in acceleration is relatively larger than the high frequency component, In step S125, control unit 110 identifies the exercise state as bicycle travel. Thereafter, the control unit 110 advances the process to be executed to the process of step S141.

  Further, when it is determined that the resultant acceleration Sa is less than 0.1 (when it is determined YES at step S116), that is, when it is determined that it is in a stationary state or a substantially stationary state, step S131. Thus, the controller 110 has an absolute value of the difference between θx calculated in step S115 and θsx stored in the memory 120 in step S128 larger than 20 degrees (| θx−θsx |> 20), that is, during walking and at present It is determined whether the angle formed by the X axis of the acceleration sensor is greater than 20 degrees.

  When it is determined that | θx−θsx |> 20 is not satisfied (when NO is determined in step S131), that is, when the angle between the X axis of the current acceleration sensor and the walking time is 20 degrees or less (acceleration sensor (When the direction of the acceleration sensor does not change much between walking and present) with respect to the X axis, the control unit 110, in step S132, determines the difference between θy calculated in step S115 and θsy stored in the memory 120 in step S128. Is larger than 20 degrees (| θy−θsy |> 20), that is, it is determined whether or not the angle formed by the Y axis of the acceleration sensor during walking and the current acceleration is larger than 20 degrees.

  When it is determined that | θy−θsy |> 20 is not satisfied (when NO is determined in step S132), that is, the angle formed between the X and Y axes of the current acceleration sensor during walking and the current acceleration sensor is 20 degrees or less. In the case (when the direction of the acceleration sensor does not change so much between walking and the current about the X and Y axes of the acceleration sensor), in step S133, the control unit 110 calculates θz calculated in step S115 and the memory 120 in step S128. It is determined whether the absolute value of the difference from θsz stored in is greater than 20 degrees (| θz−θsz |> 20), that is, whether the angle formed by the Z axis of the current acceleration sensor is greater than 20 degrees during walking. To do.

  When it is determined that | θz−θsz |> 20 is not satisfied (when NO is determined in step S133), that is, the angle formed by each of the X, Y, and Z axes of the acceleration sensor during walking and the current acceleration sensor is 20 degrees. In the following case (when the direction of the acceleration sensor does not change much between walking and present with respect to the X-axis, Y-axis, and Z-axis of the acceleration sensor), in step S134, the control unit 110 keeps the user's posture upright. Identifies it. Thereafter, the control unit 110 advances the process to be executed to the process of step S141.

  On the other hand, if any of | θx−θsx |> 20, | θy−θsy |> 20, and | θz−θsz |> 20 is satisfied (when YES is determined in any of steps S131 to S133), That is, when any of the angles formed by the X, Y, and Z axes of the current acceleration sensor when walking and is greater than 20 degrees (for any of the X, Y, and Z axes of the acceleration sensor, When the direction of the acceleration sensor changes between walking and the present), in step S135, the control unit 110 identifies the user's posture as sitting or lying. Thereafter, the control unit 110 advances the process to be executed to the process of step S141.

  In this embodiment, when the angle formed by each axis of the current acceleration sensor is 20 degrees or less at the time of walking, the direction of the acceleration sensor does not change much between the time of walking and the current for each axis. I decided to judge. However, the present invention is not limited to this, and the reference angle for determination may be an angle other than 20 degrees, and the angle within a range that can be qualitatively determined that the posture does not change much when walking or standing is statistically determined. It is also possible to specify the upper limit of the range as the reference angle for determination.

  In step S141, the control unit 110 specifies exercise intensity according to the exercise state specified in step S125 or step S126 or the posture specified in step S134 or step S135.

  For example, according to the “Exercise Guidelines for Health Promotion (Exercise Guide 2006)” created by the Ministry of Health, Labor and Welfare, the exercise intensity is 1.0 Mets when sitting quietly, 1.2 Mets when standing quietly, and normal In the case of walking (flat ground, 67 m / min), 3.0 mets, in rapid walking (flat ground, 95-100 m / min), 3.8 mets, in running (134 m / min), in 8.0 mets, running (161 m / min) 10.0 mets.

  Next, in step S142, the control unit 110 identifies the duration of the exercise state identified in step S125 or step S126, or the duration of the posture identified in step S134 or step S135. This can be specified from the time when each motion state or posture is continuously specified in step S125, step S126, step S134, or step S135.

  Next, in step S143, the control unit 110 calculates the amount of exercise (unit: exercise) by multiplying the exercise intensity (unit: mets) specified in step S141 by the duration (unit: time) specified in step S142. It should be noted that here, even when stationary or almost stationary in a standing position, a sitting position, and a standing position, it is added to the momentum, but is not limited to this. For example, in the case of an exercise intensity of 3 Mets or less, It may not be added to the amount of exercise.

  The amount of exercise may be calculated as the amount of exercise after the exercise state or the posture is started, and the amount of exercise in a predetermined period unit such as one hour unit, one day unit, one week unit, and one month unit. It may be calculated together. In addition, it is recommended to perform physical activity of 3 mets or more of 23 exercises or more per week.

  In step S144, the control unit 110 determines the exercise state specified in step S125 or step S126, the posture specified in step S134 or step S135, the duration specified in step S142, and the amount of exercise calculated in step S143. Is controlled to be displayed on the display 141 by controlling the display unit 140. Thereafter, the control unit 110 returns the process to be executed to the caller process of this process.

  Other information such as the number of steps, calories burned, and the direction of the activity meter 100 indicated by the angles θx, θy, θz calculated in step S115 may be displayed. Further, the notification method to the user may be any method as long as it can notify the user of necessary information. For example, the notification method may be displayed in characters or displayed in a graph. It may be transmitted by sound.

  FIG. 9 is a graph showing an example of a change in acceleration for each axis detected by the acceleration sensor 170 of the activity meter 100 in this embodiment. Referring to FIG. 9, the characteristics of the change in acceleration are different when standing still, standing still, walking, and traveling by bicycle. I understand that.

  FIG. 10 is a graph showing an example of a change in acceleration for each axis during walking before being detected by the acceleration sensor 170 of the activity meter 100 and processed by the high pass filter 180 in this embodiment. Referring to FIG. 10, the resultant acceleration Sa calculated in step S114 of FIG. 6 when such a change is made is 0.60. One cycle of walking is about 1 second.

  FIG. 11 is a graph showing an example of a change in acceleration for each axis during walking after being detected by the acceleration sensor 170 of the activity meter 100 in this embodiment and subjected to signal processing by the high-pass filter 180. Referring to FIG. 11, the change in acceleration is obtained by processing the acceleration shown in FIG. The combined acceleration Sb calculated in step S123 of FIG. 6 when making such a change is 0.54.

  As a result, the value of Sa / Sb calculated in step S124 of FIG. 6 is about 1.12, which does not satisfy the condition of Sa / Sb> 1.5. For this reason, in step S126, the exercise state is specified as walking or running.

  FIG. 12 is a graph showing an example of a change in acceleration for each axis during bicycle travel before being detected by the acceleration sensor 170 of the activity meter 100 in this embodiment and subjected to signal processing by the high pass filter 180. Referring to FIG. 12, the combined acceleration Sa calculated in step S114 of FIG. 6 when such a change is made is 0.45. Further, one cycle of bicycle traveling is about 1 second.

  FIG. 13 is a graph showing an example of changes in acceleration for each axis during bicycle travel after being detected by the acceleration sensor 170 of the activity meter 100 and subjected to signal processing by the high-pass filter 180 in this embodiment. Referring to FIG. 13, this change in acceleration is obtained by processing the acceleration shown in FIG. The combined acceleration Sb calculated in step S123 of FIG. 6 when such a change is made is 0.16.

  Thus, the value of Sa / Sb calculated in step S124 of FIG. 6 is about 2.74, which satisfies the condition of Sa / Sb> 1.5. For this reason, in step S125, the exercise state is specified as bicycle travel.

  FIG. 14 is a graph illustrating an example of a change in the combined acceleration and sensor angle during walking in this embodiment, and a diagram illustrating the direction of the activity meter 100. Referring to FIG. 14, the combined acceleration Sa calculated in step S114 of FIG. 6 when such a change is made is 1.80. For this reason, the condition of Sa <0.1 is not satisfied in step S116 of FIG. For this reason, it is not determined that it is stationary or almost stationary.

  Since this time is during walking, the angles θx = 90.0 °, θy = 0.0 °, θz = 0.0 ° formed by the axes of the acceleration sensors calculated in step S115 of FIG. 6 with the horizontal plane are determined in step S127. The angles θsx, θsy, and θsz between the axes of the acceleration sensor when standing and the horizontal plane are set.

  FIG. 15 is a graph showing an example of a change in the combined acceleration and sensor angle during bicycle travel in this embodiment and a diagram showing the direction of the activity meter 100. Referring to FIG. 15, the combined acceleration Sa calculated in step S114 of FIG. 6 when such a change is made is 1.19. For this reason, the condition of Sa <0.1 is not satisfied in step S116 of FIG. For this reason, it is not determined that it is stationary or almost stationary.

  In this case, the value of Sb is not shown in step S124 of FIG. 6, but a case where it is determined that the bicycle is traveling by satisfying Sa / Sb> 1.5 is shown. However, θx = 45.0 °, θy = 0.0 °, θz = 45.0 °, θsx = 90.0 °, θsy = 0.0 °, and θsz = 0.0 °. Therefore, in the determination from step S131 to step S133, | θx−θsx | = 45> 20, | θy−θsy | = 0 ≦ 20, | θz−θsz | = 45> 20. Therefore, it is not determined that the vehicle is standing, and it is determined that the bicycle is not walking or running. May be.

  FIG. 16 is a graph showing an example of a change in the combined acceleration and sensor angle when standing still in this embodiment, and a diagram showing the direction of the activity meter 100. Referring to FIG. 16, the combined acceleration Sa calculated in step S114 of FIG. 6 when making such a change is 0.03. Therefore, the condition of Sa <0.1 is satisfied in step S116 in FIG. For this reason, it is determined that it is stationary or almost stationary.

  Since θx = 90.0 °, θy = 0.0 °, θz = 0.0 °, θsx = 90.0 °, θsy = 0.0 °, θsz = 0.0 °, the determination of step S131 to step S133 results in | θx−θsx | = Since 0 ≦ 20, | θy−θsy | = 0 ≦ 20, | θz−θsz | = 0 ≦ 20, the standing position is specified in step S134.

  FIG. 17 is a graph showing an example of a change in the combined acceleration and sensor angle when the sitting position is stationary in this embodiment, and a diagram showing the direction of the activity meter 100. Referring to FIG. 17, the combined acceleration Sa calculated in step S114 of FIG. 6 when making such a change is 0.03. Therefore, the condition of Sa <0.1 is satisfied in step S116 in FIG. For this reason, it is determined that it is stationary or almost stationary.

  Since θx = 0.0 °, θy = 0.0 °, θz = 90.0 °, θsx = 90.0 °, θsy = 0.0 °, and θsz = 0.0 °, the determination of step S131 to step S133 results in | θx−θsx | = Since 90> 20, | θy−θsy | = 0 ≦ 20, | θz−θsz | = 90> 20, the sitting position or the supine position is specified in step S135.

  (1) As described above, the activity meter 100 includes the main body 191, the acceleration sensor 170 that detects acceleration in a plurality of directions of the main body 191, the control unit 110, and the memory 120, and the main body 191. Is a device that detects a user's body movement that holds the mouse in a predetermined part (for example, waist) (for example, fixed to the waist belt, for example, or fixed in a pocket, etc.). .

  Based on the acceleration detected by the acceleration sensor 170 in step S116 and step S124 of FIG. 6 by the control unit 110 of such an activity meter 100, the behavior when the user is walking or running is the main body 191. In step S128, the orientation of the main body 191 when it is determined that the user behaves when walking or running is stored in the memory 120, and from step S131. In step S135, the user's posture is determined based on the orientation stored in the memory 120.

  For this reason, a user's posture is determined based on the direction of the activity meter 100 when walking or running. As a result, the posture of the user can be determined without being limited to the holding position.

  (2) The ratio of the low-frequency component (for example, a frequency component less than 2 Hz) in the temporal change in the acceleration detected by the acceleration sensor 170 in step S124 of FIG. In the case where it is determined whether or not the ratio of the low frequency component is large, in step S126, the user has the first relatively large vertical movement. If it is determined that the main body 191 has a behavior when walking or running as a continuous motion, while it is determined that the ratio of the low frequency component is small, in step S125, the user moves up and down. It is determined that the main body 191 is performing a behavior when performing a relatively small second continuous motion (for example, cycling).

  A continuous motion with a large vertical motion has a relatively large proportion of the low frequency component of the temporal change in acceleration, and a continuous motion with a small vertical motion has a relatively small proportion of the low frequency component of the temporal change in acceleration. Therefore, the first continuous motion having a large vertical movement and the second continuous motion having a small vertical motion are discriminated by determining whether or not the ratio of the low frequency component of the temporal change in acceleration is relatively larger than the high frequency component. can do.

  (3) The inclination (for example, θsx, θsy, θsz) of the main body with respect to a predetermined reference when the controller 110 determines that the first continuous motion is determined in step S131 to step S133 in FIG. The angle formed by the inclination of the main body with respect to a predetermined reference (for example, θx, θy, θz) is larger than the predetermined angle (| θx−θsx |> 20, | θy−θsy |> 20, | θz−θsz | > 20) is determined, and in step S116, it is determined whether the main body 191 does not behave when the user is moving (Sa <0.1), and the user is moving. If it is determined that the body portion 191 does not perform the behavior of, if it is determined that it is smaller than the predetermined angle, it is determined in step S134 that the user's posture is standing, but is larger than the predetermined angle. If it is determined, in step S135, the user Attitude is determined to be different from the standing position.

  For this reason, the posture of the user is quantitatively determined based on the direction of the activity meter 100 when walking or running. As a result, the posture of the user can be accurately determined without being limited to the holding position.

  (4) The activity meter 100 further includes a display 141 that outputs predetermined information. The control unit 110 controls the display unit 140 and outputs information based on the determination result of the exercise state and the posture to the display 141. For this reason, the determination result of the exercise state and the posture can be transmitted to the user.

  (5) The first value (for example, Sa) that does not remove the low-frequency component from the combined acceleration of the acceleration detected by the acceleration sensor 170 by the control unit 110 is replaced with the second value (for example, the low-frequency component is excluded). By determining whether or not the value divided by (Sb) (for example, Sa / Sb) is larger (Sa / Sb> 1.5) than the predetermined value (for example, 1.5), the ratio of the low frequency component is determined. It is determined whether it is larger than the high frequency component.

  For this reason, the 1st continuous motion with a large up-and-down movement of a user and the 2nd continuous motion with a small are quantitatively judged. As a result, it is possible to accurately discriminate between the first continuous motion having a large vertical movement of the user and the second continuous motion having a small vertical motion.

Next, a modification of the embodiment described above will be described.
(1) In the above-described embodiment, the bicycle running, walking or running is determined in step S124 of FIG. 6 depending on whether Sa / Sb> 1.5. However, the present invention is not limited to this, and instead of the determination in step S124, when the determination in steps S131 to S133 is not specified as standing, it is determined that the bicycle is running, and when it is specified as standing, it is determined as walking or running. You may do it.

  (2) In the above-described embodiment, the invention of the device for the activity meter 100 has been described. However, the present invention is not limited to this, and can be understood as an invention of a control method for controlling the activity meter 100 and an invention of a control program executed by the activity meter 100.

  (3) The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  100 activity meter, 110 control unit, 120 memory, 130 operation unit, 131 decision switch, 132 left operation / memory switch, 133 right operation switch, 140 display unit, 141 display, 170 acceleration sensor, 180 high-pass filter, 190 power supply, 191 body part, 192 clip part.

Claims (6)

A body movement detection device that includes a main body, a detection unit that detects acceleration in a plurality of directions of the main body, a control unit, and a storage unit, and detects a user's body movement that holds the main body at a predetermined site. There,
The controller is
Based on the acceleration detected by the detection unit, a motion determination unit that determines whether or not the main body is performing a behavior when the user is walking or running,
Storage control means for storing in the storage section the orientation of the main body when it is determined by the motion determination means that the user is walking or running.
A body motion detection device comprising posture determination means for determining a posture of a user based on the orientation stored in the storage unit. The control unit further includes:
Component determination means for determining whether the ratio of the low frequency component of the temporal change in the acceleration detected by the detection unit is greater than the high frequency component;
When the component determining unit determines that the proportion of the low frequency component is large, the user is performing the walking or running as the first continuous motion with relatively large vertical movement. When it is determined that the main body is performing the behavior when the ratio of the low frequency component is small, the user is performing a second continuous motion with relatively small vertical movement. The body motion detection device according to claim 1, wherein the body motion is determined to be a behavior. The control unit further includes:
An angle formed by the inclination of the main body portion with respect to the predetermined reference when the movement determination means determines that the first continuous movement is greater than the predetermined angle of the main body portion with respect to the determination target A tilt judging means for judging whether or not
The movement determination means further determines whether or not the main body portion has a behavior when the user is moving,
If it is determined by the motion determination means that the main body portion is not performing the behavior when the user is moving, the posture determination means is less than the predetermined angle by the inclination determination means. The user's posture is determined to be different from the standing position when the tilt determination unit determines that the user's posture is greater than the predetermined angle while determining that the user's posture is standing. Body motion detection device. An output unit for outputting predetermined information;
The control unit further includes:
The body motion detection device according to claim 1, further comprising an output control unit that controls the output unit to output information based on a determination result by the motion determination unit and the posture determination unit.   The component determination means has a predetermined value obtained by dividing a first value not removing the low frequency component from a combined acceleration of the acceleration detected by the detection unit by a second value excluding the low frequency component. The body motion detection device according to claim 2, wherein it is determined whether or not a ratio of the low frequency component is larger than a high frequency component by determining whether or not the value is larger than a value. A body movement detection device that includes a main body part, a detection part that detects accelerations in a plurality of directions of the main body part, a control part, and a storage part, and detects a body movement of a user holding the main body part at a predetermined site. A control method for controlling,
The control unit is
Based on the acceleration detected by the detection unit, the step of determining whether or not the main body part has a behavior when a user is walking or running;
Storing in the storage unit the orientation of the main body when it is determined that the user behaves when walking or running;
And a step of determining a posture of the user based on the orientation stored in the storage unit.

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