JP4591918B2 - Body movement measuring device - Google Patents

Description

  The present invention relates to a body motion measuring apparatus including a body motion sensor that detects body motion in different directions including the influence of gravitational acceleration.

  A conventional body motion measuring apparatus includes a plurality of body motion sensors that can detect the magnitude of body motion in different directions and an angle detection sensor that detects a sensing angle of each body motion sensor, and is suitable for detecting the number of steps. There has been a pedometer that selects a body motion sensor that forms a sensing angle and detects the number of steps based on the output of the selected body motion sensor (see, for example, Patent Document 1).

A pedometer that counts the number of steps based on the selected output by a body motion measuring device that selects a body motion sensor having a larger output among body motions in different directions detected by the body motion sensor. (For example, see Patent Document 2).
JP 09-223214 A Patent 3543778

  However, the pedometers disclosed in Patent Documents 1 and 2 select one of a plurality of body motion sensors based on a sensing angle or an output size, and use the output of the selected body motion sensor. Since the number of steps is detected, only the component force direction of body movement is detected due to the mounting direction of the device or the tilt of the device, and the output is reduced. When the number of steps is counted using this output, the output of the selected body motion sensor should be detected as the number of steps. However, a satisfactory output value for counting the number of steps cannot be obtained and counted. It was.

  In Patent Document 1, the angle detection sensor must be provided separately from the body motion sensor, leading to an increase in cost.

  Accordingly, the present invention provides a body motion measuring device that solves the above-described problems and detects a body motion output that does not cause a decrease in output due to the tilt of the device.

  In order to solve the above-described problems, the present invention is arranged to detect body motion in different directions, and a body motion sensor that detects a body motion signal including a gravitational acceleration component in each detection direction at a time, and is set in advance. Body motion output computing means for computing a difference between each body motion signal from an offset voltage value as each body motion output, combined output computing means for combining each body motion output and computing a composite output, and the composite output Based on the above, there is provided a body movement measuring device comprising body movement counting means for counting a predetermined body movement.

  Further, the apparatus further comprises a determining means for determining whether or not the value of each body motion output calculated by the body motion output calculating means is suitable for the calculation of the combined output, and the value of each body motion output is synthesized by the determining means. When it is determined that it is not suitable, the value of the body movement output is regarded as zero.

  Further, the apparatus further comprises a determining means for determining whether or not the value of each body motion output calculated by the body motion output calculating means is suitable for the calculation of the combined output, and the value of each body motion output is synthesized by the determining means. When it is determined that it is not suitable, the composite output calculation means calculates the composite output by regarding the value of the composite output including the body motion output as zero.

  Further, the determination means determines that the value of the body motion output is not suitable for synthesis when the average value or the midpoint code of the body motion output in a predetermined section is different from the sign of the value of the body motion output. To do.

  The body motion sensor is arranged to detect body motion in two or three directions orthogonal to each other.

  Further, the composite output calculation means obtains a composite output by the square root of the sum of values obtained by squaring each body motion output value.

  Further, the body motion counting means is configured to output one of a value of gravitational acceleration, a composite output of an average value of predetermined intervals of the body motion outputs, or a composite output of a midpoint of the predetermined interval, and the composite output. Dynamic acceleration calculating means for calculating the difference from the value as the magnitude of body movement (dynamic acceleration) is further provided.

  The body motion measuring device of the present invention is arranged to detect body motion in different directions, detects a body motion signal including a gravitational acceleration component in each detection direction, and a preset offset voltage. Based on the combined output, body movement output calculating means for calculating a difference between the body movement signals from the value as each body movement output, combined output calculating means for combining the body movement outputs and calculating a combined output, and Thus, the body motion detection means for counting the predetermined body motion enables detection of the body motion without a decrease in output due to the angle.

  Further, the apparatus further comprises a determining means for determining whether or not the value of each body motion output calculated by the body motion output calculating means is suitable for the calculation of the combined output, and the value of each body motion output is synthesized by the determining means. When it is determined that it is not suitable, the value of the body movement output is regarded as zero. Alternatively, the apparatus further includes a determination unit that determines whether the value of each body motion output calculated by the body motion output calculation unit is appropriate for the calculation of the combined output, and the value of each body motion output is combined by the determination unit. When it is determined that it is not suitable, the combined output calculating means calculates a combined output by regarding the value of the combined output including the body movement output as zero, and the determining means calculates the body movement in a predetermined section. When the average value of output or the sign of the midpoint is different from the sign of the value of the body motion output, the value of the body motion output is determined to be unsuitable for synthesis, and therefore the dynamic acceleration is large However, data sufficient for counting the number of steps can be obtained with high accuracy.

  The body motion sensor is arranged so as to detect body motion in two or three directions orthogonal to each other, and the combined output calculation means outputs a combined output by a square root of a sum of values obtained by squaring each body motion output value. Therefore, an angle formed by each body motion sensor is not required for synthesis, and a synthesized output can be easily obtained.

  Further, the body motion counting means is configured to output one of a value of gravitational acceleration, a composite output of an average value of predetermined intervals of the body motion outputs, or a composite output of a midpoint of the predetermined interval, and the composite output. Since the apparatus further includes dynamic acceleration calculation means for calculating the difference from the value as the magnitude of body movement (dynamic acceleration), the present invention can be applied to an apparatus that measures biological information based on dynamic acceleration.

  The body motion measuring device of the present invention is arranged to detect body motion in different directions, detects a body motion signal including a gravitational acceleration component in each detection direction, and a preset offset voltage. Based on the combined output, body movement output calculating means for calculating a difference between the body movement signals from the value as each body movement output, combined output calculating means for combining the body movement outputs and calculating a combined output, and And body movement counting means for counting predetermined body movements.

  Further, the apparatus further comprises a determining means for determining whether or not the value of each body motion output calculated by the body motion output calculating means is suitable for the calculation of the combined output, and the value of each body motion output is synthesized by the determining means. When it is determined that it is not suitable, the value of the body movement output is regarded as zero.

  Further, the apparatus further comprises a determining means for determining whether or not the value of each body motion output calculated by the body motion output calculating means is suitable for the calculation of the combined output, and the value of each body motion output is synthesized by the determining means. When it is determined that it is not suitable, the composite output calculation means calculates the composite output by regarding the value of the composite output including the body motion output as zero.

  Further, the determination means determines that the value of the body motion output is not suitable for synthesis when the average value or the midpoint code of the body motion output in a predetermined section is different from the sign of the value of the body motion output. To do.

  The body motion sensor is arranged to detect body motion in two or three directions orthogonal to each other.

  Further, the composite output calculation means obtains a composite output by the square root of the sum of values obtained by squaring each body motion output value.

  Further, the body motion counting means is configured to output one of a value of gravitational acceleration, a composite output of an average value of predetermined intervals of the body motion outputs, or a composite output of a midpoint of the predetermined interval, and the composite output. Dynamic acceleration calculating means for calculating the difference from the value as the magnitude of body movement (dynamic acceleration) is further provided.

  The first embodiment of the present invention is an example of a body movement measuring device that counts walking using two body movement sensors arranged to detect body movements in two directions orthogonal to each other, and will be described below with reference to the drawings. To do.

  First, the configuration of the body movement measuring apparatus according to the first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is an external front view showing a state in which the body motion measuring device incorporating the two body motion sensors is carried with a certain inclination, and FIG. 2 is an electric block diagram.

  In the first embodiment, the body movement measuring device 1 includes an input device 2 and a display device 3 on the front surface, includes the two body motion sensors 4 inside, and further includes amplifiers 5 and 6, an A / D converter 7, 8, a storage device 9, and a CPU 10.

  The input device 2 is provided for inputting various settings, measurement start and end, and the display device displays various guidance or measurement results. As shown in FIG. 1, the body motion sensor 4 includes an X-axis body motion sensor 4a having sensitivity in the X-axis direction and a Y-axis body motion sensor 4b having sensitivity in the Y-axis direction. A body motion signal including a gravitational acceleration component in the direction is acquired at a constant sampling period. Here, in this example, it is assumed that the subject wears the body movement measuring device 1 on a belt or the like with an inclination as shown in FIG. 1 with respect to the vertical direction and the horizontal direction. It is assumed that the surface formed by the shaft is mounted parallel to the vertical direction.

  The storage device 9 includes an X-axis buffer 9a for storing signals from the X-axis body motion sensor 4a and a Y-axis buffer 9b for storing signals from the Y-axis body motion sensor 4b.

  The X-axis body motion sensor 4a is connected to the CPU 10 via the amplifier 5 and the A / D converter 7, and the body motion sensor 4b is also connected to the CPU 10 via the amplifier 6 and the A / D converter 8. The analog signals detected by the body motion sensors 4a and 4b are sent to the CPU 10 as digital signals. The CPU 10 also serves as body movement output calculation means, combined output calculation means, body movement count means, and determination means.

  The detection of body motion signals by the body motion sensors 4a and 4b and the calculation means will be described with reference to FIGS. 3 and 4 are waveforms respectively showing temporal changes of the respective body motion signals during walking detected by the X-axis and Y-axis body motion sensors 4a and 4b, and FIG. 5 is the X-axis and Y-axis body motions. FIG. 6 is a waveform showing the time change of each body motion signal detected by the sensors 4a and 4b when the body motion is large, such as during running, and FIG. 6 is preset from the body motion signals shown in FIG. FIG. 7 is a waveform showing the time change of the combined output obtained by synthesizing each body movement output value.

  First, in the detection of the body motion signal, when detecting a body motion with a substantially constant rhythm such as walking, the X-axis body motion sensor 4a and the Y-axis body motion sensor 4b as shown in FIGS. Each of the body motion signals Ax0 and Ay0 detected by (1) forms a signal waveform as shown in the figure along with the time change.

  Each of the body motion signals is a body under the influence of gravitational acceleration in the X-axis direction and the Y-axis direction with a preset offset voltage applied to the X-axis body motion sensor 4a and the Y-axis body motion sensor 4b. It detects motion vibration (dynamic acceleration). That is, a waveform is formed such that the dynamic acceleration swings up and down with the output of gravitational acceleration in each axial direction as a baseline. For example, a waveform between the upper limit peak value and the lower limit peak value in FIGS. The average value of a predetermined section shown as a section (hereinafter referred to as a PP section) indicates the gravitational acceleration components XG and YG applied in the respective axis directions. That is, even when there is no dynamic acceleration, when the X-axis body motion sensor 4a is sensitive in the horizontal direction not detecting the gravitational acceleration component, the offset voltage value A0 is output, When the X axis that is the detection direction is tilted from the horizontal direction, the X-axis body motion sensor 4a detects the gravitational acceleration XG that acts in the tilt direction. The same applies to the Y-axis body motion sensor 4b.

  Here, the output value when the body motion measuring device 1 is stationary and the sensitivity direction of the X-axis body motion sensor 4a is in the horizontal direction and the gravitational acceleration component is not detected, that is, the offset voltage value is A0, Similarly, assuming that the offset voltage value A0 is the same for the Y-axis body motion sensor 4b, FIG. 5 is a graph showing temporal changes of the body motion signals Ax0 and Ay0 in the X-axis and Y-axis directions when a person runs. .

  The body movement output calculation means subtracts the offset voltage value A0 from the body movement signals Ax0 and Ay0 detected by the X-axis and Y-axis body movement sensors 4a and 4b, and outputs the result. 6 shows the time change of the output as the body motion outputs Ax1 and Ay1 of the X axis and the Y axis. At this time, Ax1 and Ay1 indicate the dynamic acceleration detected together with the gravitational acceleration component in each axial direction.

The combined output calculation means calculates a combined output A1 of the body movement outputs Ax1 and Ay1 of the X axis and the Y axis, and the combined output A1 calculates a combined vector of two orthogonal axes, A1 = (Ax1 ² + Ay1 ² ) ^1/2 . That is, the magnitude of the resultant force of the dynamic acceleration under an environment where the gravitational acceleration 1G is applied is obtained, and a composite output waveform as shown in FIG. 7 is obtained.

  The body movement counting means is for counting the number of steps using the combined output A1, and for example, as shown in FIG. It counts as one time until it becomes below the threshold value.

  The determination means will be described below with reference to FIGS. FIG. 8 is a waveform showing the time change of each body motion output output based on the determination by the determination means, and FIG. 9 shows the time change of the synthesized output obtained by synthesizing the determined body motion output. It is a waveform.

  The combined output A1 shown in FIG. 7 is all positive output as is apparent from the arithmetic expression of A1. That is, as shown by a circled portion D in FIG. 7, the output of the extreme value that should be convex downward is folded back symmetrically from the output 0 (V) in the waveform of the composite output A1, and is added to form a waveform. . As described above with reference to FIG. 5, in each of the X-axis and Y-axis body motion sensors 4a and 4b, the dynamic acceleration oscillates up and down with the gravitational acceleration component as a base line. This is because the waveform formed by Ay0 may intersect with the offset voltage A0 as the dynamic acceleration increases, and this intersected portion becomes the folded output shown in the circled portion D in FIG.

  In the waveform of the composite output A1 having the folding output as shown in FIG. 7, the value of the folding output increases as the dynamic acceleration increases. Therefore, it is difficult for the body motion counting means to discriminate based on the threshold value. There is a case.

  Accordingly, in order to prevent the folding output from being output in the combined output calculation, the respective body motion outputs Ax1 and Ay1 are compared with the average values XG and YG of the PP section with respect to the plus or minus signs. When the signs of the dynamic outputs Ax1 and Ay1 are different, it is determined that the output is not suitable for synthesis, the value of the body movement output is replaced with zero, and when the signs are the same, the determination is made as Ax1 and Ay1 as they are, By outputting the body motion output as Ax1 = Ax2 and Ay1 = Ay2, as shown in the graph of FIG. 8, a waveform formed from the body motion outputs Ax2 and Ay2 is obtained.

  Further, a composite output waveform as shown in FIG. 9 is obtained by calculating the composite output A2 of the determined body movement outputs Ax2 and Ay2 by the composite output calculation means.

  Hereinafter, the operation of the body movement measuring apparatus 1 according to the present embodiment will be described with reference to FIGS. FIG. 10 is a flowchart showing a main routine of the operation of the body movement measuring apparatus 1 of this embodiment, FIG. 11 is a subroutine showing a procedure of body movement output determination, and FIG. 12 is a subroutine showing a step count processing procedure. .

  First, in the main routine of FIG. 10, when measurement start is input by the input device 2, the body motion measuring device 1 is powered on, and the device is initially set in step S1. In step S2, body motion signals Ax0 and Ay0 including respective axial components of gravitational acceleration are detected in each of the X-axis body motion sensor 4a and the Y-axis body motion sensor 4b, and the amplifiers 5 and 6 and the respective A / Ds are detected. It is sampled as digital data by the CPU 10 via the converters 7 and 8 to form the waveform shown in FIG.

  In step S3, the difference between the sampled body motion signals Ax0 and Ay0 and the offset voltage value A0 is calculated to obtain the body motion outputs Ax1 and Ay1, respectively, and the X-axis and Y-axis buffers 9a and 9b. Are stored in a waveform as shown in FIG.

  In step S4, it is determined whether or not the sampling of each of the body motion sensors 4a and 4b has been acquired for a predetermined period. In the first embodiment, the predetermined interval refers to the interval between the upper limit peak value and the lower limit peak value (PP interval) of the temporal changes of the body motion signals Ax0 and Ay0, and is obtained in the PP interval. The number of samplings to be performed is n = 1 to nmax. That is, if the number of Ax1 and Ay1 stored in the X-axis buffer 9a and the Y-axis buffer 9b has not reached nmax, the process proceeds to NO, and sampling is continued in step S2 to obtain nmax samples. If yes, go to

  In the subsequent step S5, each average value of the nmax body motion outputs Ax1 and Ay1 is calculated and stored in the storage unit 9. As described above, the average value of each PP section indicates the gravitational acceleration component force (XG and YG) applied to each axis.

  In step S6, in order to sequentially read the sampling data stored from the buffer address n = 1 to nmax in the X-axis and Y-axis buffers 9a and 9b, the buffer address is returned to n = 0, and the following step In S7, the buffer address is counted as n = n + 1, and sequentially counted up, and the sampling data forming the PP section of the X axis and Y axis body movement output waveforms are read one by one.

  The body motion output determination process in step S8 will be described later with reference to FIG. 11. The determination means in the CPU 10 determines the sign of the average value of the PP sections of each body motion output and the nth body motion output. A process of obtaining the determined body motion outputs Ax2 and Ay2 shown in FIG. 8 by comparing the sign of the value and replacing the nth body motion output value with zero if the sign is different It is. As a result, as described above, it is possible to prevent the folding output from being given when the body motion output is synthesized.

In step S9, the nth body motion outputs Ax2 and Ay2 are synthesized by the synthesized output calculation means in the CPU 10 to obtain a synthesized output A2 as shown in FIG. The composite output A2 is calculated by an expression of A2 = (Ax2 ² + Ay2 ² ) ^1/2 . In subsequent S10, based on the composite output A2, the number of steps is detected by a known step counting process by a body movement counting means in the CPU 10 described later with reference to FIG.

  In subsequent step S11, it is determined whether or not the processing from step S7 to step S10 has been performed on all the sampling data in the PP section, that is, whether n = nmax has been reached. If not reached, the process proceeds to NO, n = n + 1, and the above-described processing procedure is repeated for the next sampling data. If reached, the process proceeds to YES, and the process returns to step S1 and proceeds to the process for the next PP section. .

  Here, the body movement output determination processing in step S8 will be described in detail with reference to FIG. In step S21, the n-th body motion outputs Ax1 and Ay1 stored in the storage unit 9 and the average value of the PP section of each axis are read. In subsequent step S22, the sign of each average value is compared with the sign of each of the body movement outputs Ax1 and Ay1, and if the signs are the same, the process returns to YES because the above-described folding output is not output during the composite output calculation, and step S24 The body motion outputs Ax1 and Ay1 are used as the body motion outputs Ax2 and Ay2 for which the suitability has been determined, and the storage of the X-axis and Y-axis buffers 9a and 9b is updated, and the process returns to the main routine of FIG. Further, when the signs are different, the process proceeds to NO, and the values of the body movement outputs Ax1 and Ay1 are replaced with zero so that the folding output is not output at the time of the combined output calculation, and the X-axis and Y-axis buffers 9a and 9 Each is stored in 9b. That is, the body motion outputs Ax2 and Ay2 are both zero, and the process returns to the main routine of FIG.

  Further, the step count processing in step S10 will be described in detail with reference to FIG. In this step counting process, a threshold value for determining the combined output A2 sufficient for detecting the number of steps is set in advance, and the number of steps is counted up when the combined output A2 exceeds the threshold and falls below the threshold value. To do.

  That is, when the composite output A2 is calculated, the process proceeds to the step count processing of FIG. 12, and in step S31, the composite output A2 exceeds the threshold value for determining the output sufficient to detect the step count. It is determined whether or not flag 1 is set. When the flag 1 is not set, it is determined that the combined output A exceeding the threshold is not detected, and the process proceeds to NO. In step S32, it is determined whether the calculated combined output A2 exceeds the threshold. Is done. If not, the process proceeds to NO and returns to the main routine of FIG. 10 as it is, and if it exceeds, the process proceeds to YES, and after setting the flag 1 in step S33, the process returns to the main routine of FIG.

  If it is determined in step S31 that the flag 1 is set, that is, if the combined output A2 exceeding the threshold is already detected, the process proceeds to YES. In step S34, the combined output A2 is It is determined whether or not the threshold value is below. If it exceeds the threshold, the process proceeds to NO, and in step S35, the number of steps is counted up and stored in the storage device 9 as described above.

  In the body movement measuring device 1 of the first embodiment, the determination unit calculates the body movement outputs Ax2 and Ay2 based on the suitability determination for the combination of the body movement outputs Ax1 and Ay1, respectively, Based on Ay2, the composite output calculation means calculates the composite output A2. On the other hand, the body movement measuring apparatus according to the second embodiment of the present invention calculates the combined output A1 based on the body movement outputs Ax1 and Ay1, and determines whether or not the body movement outputs Ax1 and Ay1 are combined by the determination unit. Based on this, the combined output A2 is calculated from the combined output A1.

  Hereinafter, the processing procedure of the body movement measuring apparatus according to the second embodiment will be described based on FIGS. 13 and 14 with the difference from the operation of the first embodiment. FIG. 13 is a flowchart of a main routine showing the main operation of the second embodiment, and FIG. 14 is a subroutine showing a body movement output determination process.

  Here, it is assumed that the body movement measuring apparatus according to the second embodiment has the same configuration as the external view and the block diagram illustrated in FIGS. 1 and 2 in the first embodiment.

  In FIG. 13, when the power source of the body movement measuring device 1 is turned on as in the first embodiment, steps S101 to S103 operate in the same manner as steps S1 to S3 in the main routine of FIG. In step S104, a combined output A1 is calculated based on the body movement outputs Ax1 and Ay1 calculated in step S103. In the subsequent step S5, it is determined again whether the body motion signals Ax0 and Ay0 have been sampled in the P-P section as in step S4 of the main routine of the first embodiment.

  Steps S106 to S108 operate in the same manner as steps S5 to S7 of the main routine of the first embodiment. In the body movement output determination process of step 109, the process proceeds to a subroutine shown in FIG. Further, based on the determination of suitability of the body motion outputs Ax1 and Ay1 for the combination by the determining means, the combined output A2 shown in FIG. 9 is calculated from the combined output A1 shown in FIG.

  Subsequent steps S110 to S112 operate in the same manner as steps S10 to S12 of the main routine of the first embodiment, and even in the step count processing of step S110, as in the first embodiment, FIG. Are processed by the subroutine.

  In the body movement output determination process of FIG. 14, steps S121 and S122 operate in the same manner as steps S21 and S22 of the subroutine of FIG. 11 showing the body movement output determination process in the first embodiment.

  In step S122, the sign of each average value is compared with the sign of each of the body movement outputs Ax1 and Ay1, and if the signs are the same, the above-described unnecessary aliasing output is not output during the composite output calculation. In step S124, the value of the n-th combined output A1 calculated in step S104 is set as the combined output A2, the storage in the storage unit 9 is updated, and the process returns to the main routine of FIG. Further, if the signs are different, the process proceeds to NO, and in step S23, the synthesized output A1 is replaced with zero so as not to output the unnecessary folded output at the time of the synthesized output calculation, and stored in the storage unit 9. That is, the composite output A2 becomes zero, and the process returns to the main routine of FIG.

  In the first and second embodiments, the X-axis body motion sensor 4a and the Y-axis body motion sensor 4b are used to detect body motion signals in two directions orthogonal to each other. Z-axis body motion sensors that are orthogonal to each other may be added to a device that detects body motion signals in three directions orthogonal to each other. In this case, although not shown in the figure, the apparatus configuration includes an amplifier and an A / D converter together with the Z-axis body motion sensor 4c based on the electric block diagram of the embodiment shown in FIG. A shaft buffer 9c is further provided. The operation is based on the procedure of the embodiment shown in FIGS. 10 to 12, and in each procedure related to the X-axis and Y-axis directions, detection, calculation, and calculation related to the Z-axis direction are performed in the same manner as the X-axis and Y-axis. By adding buffer processing or the like, the same processing as in the first and second embodiments is possible. According to this, even when the surface formed by the X-axis and the Y-axis is inclined with respect to the vertical direction, it is possible to detect body movement with high accuracy.

  Further, in the determination means of the CPU 10, a process of setting the return output unnecessary for the step count counting to zero in the composite output A1 as shown in the circled portion D of FIG. 7 is performed. In a general step counting unit that counts the number of steps based on a threshold value that determines an output sufficient for detecting the number of steps as shown in the above, such as walking or running with such a large output that the folding output affects the determination by the threshold value, etc. It is difficult to think of, and it is possible to cope with it by setting a threshold value appropriately. In most cases, the output itself is not output. In such a case, the determination means may be unnecessary.

  Further, the determination means of the CPU 10 determines that each PP section of the body motion outputs Ax1 and Ay1 is a predetermined section in step S22 of FIG. 11 and step S122 of FIG. 14, and based on the average value of the PP section. Although the suitability of the body motion outputs Ax1 and Ay1 for the composition operation is determined, the predetermined section is not limited to the PP section, and any section in which the sign of the baseline of the trajectory waveform of each body motion output can be determined. It ’s fine. Furthermore, although the average value of the PP section is acquired, the suitability determination may be performed based on the midpoint value of the upper limit peak value and the lower limit peak value in the predetermined section.

  The step counting means counts the number of steps based on the combined output A1 or A2, and the combined outputs A1 and A2 indicate the magnitude of dynamic acceleration in an environment where gravity acceleration 1G is applied. Therefore, for example, the magnitude of body motion excluding the influence of gravity acceleration (dynamic acceleration) is obtained by taking the difference between the combined output A1 or A2 and the preset output of 1G of gravitational acceleration. Furthermore, it is possible to apply the present invention to a device that measures biological information based on the dynamic acceleration. The output corresponding to 1G of gravitational acceleration may be an average value or midpoint of a predetermined section of each of the combined outputs A1 or A2, or may be an average value or midpoint of a predetermined section of each body motion output.

  Also, as shown in FIG. 2, when acquiring the body motion signals Ax0 and Ay0 from the X-axis and Y-axis body motion sensors 4a and 4b, they are acquired via the amplifiers 5 and 6, and the A / D converters 7 and 8. However, in order to remove noise from each of the body motion sensors 4a and 4b, a general analog filter is provided between each of the body motion sensors 4a and 4b and the amplifiers 5 and 6, and the body motion signal Ax0 and Ay0 may be acquired.

It is a front view of the body movement measuring apparatus of Example 1. 1 is a block diagram of a body movement measuring apparatus according to a first embodiment. It is a locus waveform which shows the time change of the body motion signal of the X-axis direction at the time of walking. It is a locus waveform which shows the time change of the body motion signal of the Y-axis direction at the time of walking. It is a locus waveform which shows the time change of the body motion signal of the X-axis and Y-axis direction at the time of driving | running | working. It is a locus waveform which shows the time change of the body movement output of a X-axis and a Y-axis direction. It is a locus waveform which shows the time change of the synthetic output based on each body motion output. It is a locus waveform which shows the time change of the body movement output which determined the suitability for composition. It is a locus waveform which shows the time change of the synthetic | combination output based on each body motion output which determined the suitability for a synthesis | combination. 3 is a flowchart showing a main routine of the first embodiment. 4 is a subroutine showing a body movement output determination process according to the first embodiment. It is a subroutine showing the step count processing. 7 is a flowchart illustrating a main routine of a second embodiment. 4 is a subroutine showing a body movement output determination process according to the first embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Body motion measuring device 2 Input device 3 Display device 4 Body motion sensor 4a X-axis body motion sensor 4b Y-axis body motion sensor 5, 6 Amplifier 7, 8 A / D converter 9 Storage device 9a X-axis buffer 9b Y-axis Buffer 10 CPU

Claims (6)

A body motion sensor arranged to detect body motion in different directions and detecting a body motion signal including a gravitational acceleration component in each detection direction;
Body motion output calculating means for calculating a difference of each body motion signal from a preset offset voltage value as each body motion output;
A combined output calculating means for calculating a combined output by combining the body movement outputs;
A body motion measuring device comprising body motion counting means for counting predetermined body motion based on the combined output ,
The body motion output value calculated by the body motion output calculation means further includes a determination means for determining whether or not the value of the body motion output is a value suitable for the calculation of the composite output, and the determination means is not suitable for the calculation of the composite output. A body motion measuring device, wherein the value of each body motion output determined to be zero is replaced with zero .   A body motion sensor arranged to detect body motion in different directions and detecting a body motion signal including a gravitational acceleration component in each detection direction;
  Body motion output calculating means for calculating a difference between each body motion signal from a preset offset voltage value as each body motion output;
  A combined output calculating means for combining the body movement outputs to calculate a combined output;
  A body motion measuring device comprising body motion counting means for counting predetermined body motion based on the combined output,
  The apparatus further includes a determining unit that determines whether or not each body motion output value calculated by the body motion output calculating unit is a value suitable for the calculation of the combined output. A body motion measuring apparatus, wherein a value obtained by combining the body motion outputs determined to be unsuitable is replaced with zero.   The determination means compares the sign of the average value or midpoint value of the body motion output in a predetermined section with the sign of the value of the body motion output, and if the sign is different, the value of the body motion output The body motion measuring device according to claim 1, wherein the body motion measuring device is determined not to be suitable for the calculation of the composite output.   The body motion measuring device according to any one of claims 1 to 3, wherein the body motion sensor is arranged to detect body motion in two or three directions orthogonal to each other.   5. The body movement measuring apparatus according to claim 1, wherein the combined output calculation unit obtains a combined output by a square root of a sum of values obtained by squaring each body movement output value. 6.   The body motion counting means is calculated by one of a value of gravity acceleration output, a composite output of an average value of each body motion output in a predetermined section, or a composite output of a midpoint of the predetermined section and the composite output calculation means. 6. The apparatus according to claim 1, further comprising dynamic acceleration calculation means for calculating a difference from the value of the synthesized output as a magnitude of body movement (dynamic acceleration). Body movement measuring device.

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