KR102025902B1 - Apparatus and method for determining a level of physical activity using an acceleration sensor - Google Patents

Abstract

The present disclosure discloses an apparatus and method for determining a more accurate state of physical activity. An apparatus for determining physical activity level according to the present specification may include an acceleration sensor configured to output a signal for movement on three axes; A real-time temporary storage unit for accumulating and storing the difference between the movement of each axis output from the acceleration sensor and the movement occurring immediately before, that is, a movement change amount and a movement occurrence time in real time; The controller calculates the current amount of exercise by calculating the current amount of exercise by multiplying the weight of the movement change accumulated in the temporary storage unit at a predetermined time interval, and calculates the average amount of exercise during the previous unit section, and calculates the current level of physical activity by referring to the immediately previous level of physical activity. ; And a storage unit configured to store a current physical activity level calculated at a predetermined time interval by the controller, wherein the weight is a value obtained by dividing unit time by accumulated movement time generated during the unit time. Can be.

Description

Apparatus and method for determining the level of physical activity using an acceleration sensor {APPARATUS AND METHOD FOR DETERMINING A LEVEL OF PHYSICAL ACTIVITY USING AN ACCELERATION SENSOR}

The present invention relates to an apparatus and method for processing a signal output to an acceleration sensor, and more particularly, to an apparatus and method for determining a physical activity level.

When monitoring biosignals related to heart disease (ECG, skin impedance, etc.), patient's movement and exercise information is additionally needed to determine whether the signal is abnormal and to improve the disease.

By defining the movement type and intensity as a standardized level and monitoring it at regular intervals (eg 1 second), it is necessary to determine the movement at a specific point in time or to calculate the momentum of a specific section.

Republic of Korea Patent Publication No. 10-1993-0009571

The present specification is to provide an apparatus and method for more accurate determination and tracking of physical activity state.

The problems described herein are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

An apparatus for determining physical activity level according to the present specification for solving the above problems includes an acceleration sensor for outputting a signal for a three-axis exercise amount; A real-time temporary storage unit for accumulating and storing the difference between the movement of each axis output from the acceleration sensor and the movement occurring immediately before, that is, a movement change amount and a movement occurrence time in real time; When the cumulative movement variation stored in the temporary storage unit satisfies a preset weighting criterion at each preset time interval, the current movement is calculated by multiplying the movement variation by a weight based on the cumulative occurrence time and calculating the average movement during the previous unit section. A controller configured to calculate a current physical activity level with reference to the immediately preceding physical activity level; And a storage unit configured to store a current physical activity level calculated at a predetermined time interval by the controller, wherein the weight is a value obtained by dividing unit time by accumulated movement time generated during the unit time. Can be.

According to an embodiment of the present disclosure, the controller may calculate the current exercise level based on the exercise amount average value during the previous unit section.

The apparatus for determining physical activity level according to the present disclosure may further include a display unit, and the controller may output a signal to display an icon corresponding to a current exercise level on the display unit.

According to one embodiment of the present specification, the controller may calculate a standard deviation with respect to the amount of change in the movement of each axis, and when the standard deviation is less than or equal to a preset reference deviation, recalculate the calculated weight twice.

According to another embodiment of the present specification, the controller may calculate a standard deviation with respect to the movement variation of each axis, and when the standard deviation is less than or equal to a preset reference deviation, recalculate the calculated current exercise amount by twice. .

Physical activity level determination method according to the present specification for solving the above problems as a physical activity level determination method using an apparatus comprising an acceleration sensor, a temporary storage unit, a control unit and a storage unit for outputting a signal for the movement of the three axes. (a) accumulating and temporarily storing a change amount and a motion occurrence time of the motion output from the acceleration sensor in real time; (b) calculating a current amount of exercise by multiplying the change amount by a weight based on the cumulative occurrence time when the cumulative movement change amount stored in the temporary storage unit satisfies a preset weight application criterion at each preset time interval; (c) calculating an average amount of exercise during the previous unit interval and calculating a current physical activity level with reference to the immediately preceding physical activity level; And (d) storing the current physical activity level calculated at a predetermined time interval by the controller; In the physical activity level determining method comprising, the weight may be a value obtained by dividing the unit time by the accumulated movement time generated during the unit time.

The method for determining a physical activity level according to the present specification may further include (e) calculating, by the controller, a current exercise level based on a preset exercise average value during a previous unit section.

The method for determining physical activity level according to the present disclosure may further include (f) outputting a signal so that the controller displays an icon corresponding to the current exercise level on the display unit.

According to one embodiment of the present specification, in the step (b), the control unit calculates a standard deviation with respect to the change amount of movement of each axis, and when the standard deviation is less than or equal to a preset reference deviation, the calculated weight is doubled. Can be recalculated.

According to another embodiment of the present specification, in the step (b), the control unit calculates a standard deviation with respect to the movement change amount of each axis, and when the standard deviation is less than or equal to a preset reference deviation, the calculated current exercise amount is calculated. Can be recalculated twice.

The physical activity level determining method according to the present specification may be implemented in the form of a computer program written to a computer readable recording medium which is written to perform each step of the physical activity level determining method in a computer.

The apparatus and method for determining physical activity level according to the present disclosure may determine the physical activity level of a user more accurately.

The effects described herein are not limited to those mentioned above, and other effects not mentioned above will be clearly understood by those skilled in the art from the following description.

1 is a block diagram schematically illustrating a configuration of an apparatus for determining physical activity level according to the present specification.
2 is a flowchart of a method of determining physical activity level according to the present specification.
3 is an icon according to each level.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art can easily understand, the embodiments described below may be modified in various forms without departing from the concept and scope of the present invention. Where possible, the same or similar parts are represented using the same reference numerals in the drawings.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a,” “an,” and “the” include plural forms as well, unless the phrases clearly indicate the opposite.

As used herein, the meaning of "comprising" embodies a particular property, region, integer, step, operation, element, and / or component, and other specific properties, region, integer, step, operation, element, component, and / or It does not exclude the presence or addition of groups.

All terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. Terms defined in advance are additionally interpreted to have a meaning consistent with the related technical literature and the presently disclosed contents, and are not interpreted in an ideal or very formal sense unless defined.

Hereinafter, an apparatus and method for determining physical activity level according to the present specification will be described with reference to the drawings. On the other hand, the physical activity level determination apparatus according to the present disclosure is assumed to operate attached to the body of the user.

1 is a block diagram schematically illustrating a configuration of an apparatus for determining physical activity level according to the present specification.

Referring to FIG. 1, the physical activity level determining apparatus 100 according to the present specification may include an acceleration sensor 110, a real time temporary storage unit 120, a controller 130, and a storage unit 140.

The acceleration sensor 110 may output a signal for the momentum of the three axes. The acceleration sensor 110 may output an acceleration signal on the X, Y, and Z axes that are perpendicular to each other as an electrical signal. In general, the value range of the signal output from the acceleration sensor 110 can be set. Here, each axis is set in the range of (-) 8000 to (+) 8000. The acceleration sensor 110 is a well-known part well known to those skilled in the art (hereinafter, those skilled in the art) to which the present specification belongs, so the detailed description thereof will be omitted.

 The real-time temporary storage unit 120 may accumulate and temporarily store the amount of motion of each axis output from the acceleration sensor 110 in real time for a preset time interval. Obviously, the preset time may be set in various ways.

The storage unit 140 may be inside or outside the control unit 130 and may be connected to the control unit 130 by various well-known means. The storage unit is a large-capacity storage medium such as a semiconductor device or a hard disk known to be capable of recording and erasing data such as RAM, ROM, and EEPROM, and is a generic term for a device for storing information regardless of the type of device. It does not refer to.

The controller 130 may be a processor, an application-specific integrated circuit (ASIC), another chipset, a logic circuit, a register, a communication modem, or data known in the art to execute calculations and various control logics to be described below. Processing apparatus and the like. In addition, when the above-described control logic is implemented in software, the controller 130 may be implemented as a set of program modules. In this case, the program module may be stored in the storage 140 and executed by a processor.

2 is a flowchart of a method of determining physical activity level according to the present specification.

2, the operation of the controller 130 will be described.

First, when the cumulative motion change amount stored in the real-time temporary storage unit 120 satisfies a preset weight application criterion, the controller 130 calculates a current exercise amount by multiplying the motion change amount by a weight based on the cumulative occurrence time. The average amount of exercise during the unit section is calculated (step S130).

The controller 130 calculates a current physical activity level by referring to the average amount of exercise during the previous unit section and the immediately previous physical activity level (step S140). In the present specification, the cumulative motion change amount during the predetermined unit time will be referred to as 'total motion change amount'.

The unit time may be set a variety of values, it will be assumed herein set to 1 second for convenience of description. The total motion change amount may have a value between 1000 and 150000 during 1 second depending on the user's movement.

In the calculation of momentum, the cumulative reason for the change of movement, not the accumulation of movement, is that the change is small because there is no difference between the previous movement and the current movement in case of small movement. However, in the case of large movements, there is a big difference between the previous movement and the current movement. Therefore, a large amount of movement in a short time may be larger than a short movement in a long time. This makes it possible to distinguish between the case of jumping lightly and the case of jumping hard.

Next, when the total motion change amount is greater than or equal to a preset reference motion change amount, the controller 130 may calculate the current exercise amount by multiplying the total motion change amount by a weight (step S130). Obviously, the preset reference motion change amount may be set in various ways, and it is assumed herein that it is set to 5000 for convenience of description. That is, if the total motion change amount exceeds 5000 for 1 second, the current exercise amount can be calculated by the value multiplied by the weight.

On the other hand, the weight may be set higher as the current movement is more severe. According to the present specification, the weight may be a value obtained by dividing the unit time by the accumulated movement time generated during the unit time.

For example, suppose you are playing hard. In this case, movement occurs when the foot touches the ground. The moment the foot touches the ground is short but it is in continuous motion. As such, the movement time may be short and the amount of change may be large. When the unit time is divided by the cumulative movement time, the weight becomes large. Therefore, in this case, the total amount of change in motion is increased by the weight. In all cases, however, weighting makes it difficult to distinguish between breathing and small movements from light movements. To distinguish these small movements, weights are not applied when the total variation is less than 5000. According to the exemplary embodiment of the present specification, the controller 130 may calculate the current exercise level by referring to the average value of the previous exercise amount during the preset unit section. For example, even if a momentary slightly small amount of exercise occurs in a series of intense exercise levels, it is determined as a series of intense exercise levels.

The current amount of exercise may determine a momentary movement, but may be insufficient to determine whether the user is actually exercising or a temporary movement. Therefore, the current exercise level of the actual user may be calculated using the average value of the current exercise amount during the preset unit section. For example, the preset unit section may be 5 seconds, and the unit section may be variously set.

In the present specification, to help understand the various exercise levels, the following levels are assumed.

Level 0: No movement

Level 1: minute movement of breathing degree

Level 2: Light Movement

Level 3: Slow Walking Activity

Level 4: Sudden movements such as weak impact

Level 5: light gymnastics or regular walking activity

Level 6: Fast paced workout

Level 7: Jogging

Level 8: fast running

Level 9: Sudden, large movements such as strong impact

3 is an icon according to each level.

The controller 130 may output a signal to display an icon corresponding to the current exercise level on the display unit. The icon allows the user to intuitively understand and confirm the exercise state.

On the other hand, since the movement measured by the acceleration sensor is similar, the actual user's movement may be different. For example, if you are running, the amount of change in movement will be measured around the linear axis. On the other hand, when playing basketball, the amount of change in movement of each axis, such as running in a straight line, jumping up and down, and dribbling, will be measured evenly. In such a case, the heart rate will be higher when the movement variation is measured in all directions even if the same movement variation is measured by the acceleration sensor.

According to one embodiment of the present specification, the controller 130 may calculate a standard deviation with respect to the amount of change in movement of each axis, and recalculate the calculated weight twice when the standard deviation is less than or equal to a preset reference deviation. have.

According to another exemplary embodiment of the present specification, the controller 130 calculates a standard deviation with respect to the amount of change in movement of each axis, and when the standard deviation is less than or equal to a preset reference deviation, double-calculates the calculated current exercise amount. can do.

In both embodiments, the standard deviation of the variation of motion of each axis can be calculated. In the case of omnidirectional movements, such as basketball, similar values will be measured for each change in the movement of each axis, resulting in a small standard deviation. On the other hand, in the case of an exercise such as running, the change in the movement of one axis will be measured high, which will increase the standard deviation. Therefore, it is possible to determine whether the standard deviation is greater than or equal to the reference deviation to increase the weight or exercise amount to determine the physical activity level closer to the actual exercise amount.

On the other hand, the storage unit 140 may accumulate information on the exercise state level of the user. This can be helpful for further analysis as to whether the user's heart rate change is due to physical activity or the heart itself.

The embodiments described in the present specification and the accompanying drawings merely illustrate some of the technical ideas included in the present invention. Therefore, since the embodiments disclosed herein are not intended to limit the technical spirit of the present invention but to explain, it is obvious that the scope of the technical spirit of the present invention is not limited by these embodiments. Modifications and specific embodiments that can be easily inferred by those skilled in the art within the scope of the technical idea included in the specification and drawings of the present invention should be construed as being included in the scope of the present invention.

100: physical activity level determination device
110: acceleration sensor
120: storage unit
130: control unit

Claims (9)

An acceleration sensor for outputting a signal for the momentum of three axes;
A real-time temporary storage unit for accumulating and temporarily storing a motion change amount and a motion occurrence time indicating a difference between a motion of each axis output from the acceleration sensor and a motion generated immediately before in real time;
When the cumulative movement change amount stored in the temporary storage unit satisfies a preset weighting criterion at each preset time interval, the current movement amount is calculated by multiplying the movement change amount by weight based on the cumulative occurrence time, and the average movement amount during the previous unit section is calculated. A controller configured to calculate a current physical activity level with reference to the immediately preceding physical activity level; And
A physical activity level determining apparatus, comprising: a storage unit for storing a current physical activity level calculated at a predetermined time interval by the controller;
The weight is a value obtained by dividing the unit time by the accumulated movement time generated during the unit time, and the controller calculates a standard deviation with respect to the movement variation of each axis, and the calculation is performed when the standard deviation is equal to or less than a preset reference deviation. Physical activity level determination device, characterized in that the re-calculated twice the weighted weight. The method according to claim 1,
The display unit further includes;
And the controller outputs a signal to display an icon corresponding to a current exercise level on the display unit. An acceleration sensor for outputting a signal for the momentum of three axes;
A real-time temporary storage unit for accumulating and temporarily storing a motion change amount and a motion occurrence time indicating a difference between a motion of each axis output from the acceleration sensor and a motion generated immediately before in real time;
When the cumulative movement change amount stored in the temporary storage unit satisfies a preset weighting criterion at each preset time interval, the current movement amount is calculated by multiplying the movement change amount by weight based on the cumulative occurrence time, and the average movement amount during the previous unit section is calculated. A controller configured to calculate a current physical activity level with reference to the immediately preceding physical activity level; And
A physical activity level determining apparatus, comprising: a storage unit for storing a current physical activity level calculated at a predetermined time interval by the controller;
The weight is a value obtained by dividing the unit time by the accumulated movement time generated during the unit time, and the controller calculates a standard deviation with respect to the movement variation of each axis, and the calculation is performed when the standard deviation is equal to or less than a preset reference deviation. Physical activity level determination device, characterized in that to re-calculate the current amount of exercise. The method according to claim 3,
The display unit further includes;
And the controller outputs a signal to display an icon corresponding to a current exercise level on the display unit. A physical activity level determination method using an apparatus including an acceleration sensor, a real-time temporary storage unit, a control unit, and a storage unit for outputting a signal for three-axis movement,
(a) temporarily storing the temporary storage unit by accumulating and storing the difference between the movement of each axis output from the acceleration sensor and the movement occurring immediately before, i.e., the movement variation amount and the movement time in real time;
(b) when the controller satisfies a preset weighting criterion based on the cumulative movement variation amount stored in the temporary storage unit at preset time intervals, the controller calculates a current exercise amount by multiplying the movement variation by a weight based on the cumulative occurrence time, and the previous unit section. Calculating an average amount of exercise during the exercise, and calculating a current physical activity level with reference to the immediately preceding physical activity level; And
(c) storing the current physical activity level calculated by the controller at a preset time interval;
The weight is a value obtained by dividing the unit time by the accumulated movement time generated during the unit time, and in the step (b), the control unit calculates a standard deviation with respect to the movement variation of each axis, and the standard deviation is preset. And recalculating the calculated weight twice when the reference deviation is less than the standard deviation. The method according to claim 5,
and (d) outputting a signal by the controller to display an icon corresponding to a current exercise level on a display unit. A physical activity level determination method using an apparatus including an acceleration sensor, a real-time temporary storage unit, a control unit, and a storage unit for outputting a signal for three-axis movement,
(a) temporarily storing the temporary storage unit by accumulating and storing the difference between the movement of each axis output from the acceleration sensor and the movement occurring immediately before, i.e., the movement variation amount and the movement time in real time;
(b) when the controller satisfies a preset weighting criterion based on the cumulative movement variation amount stored in the temporary storage unit at preset time intervals, the controller calculates a current exercise amount by multiplying the movement variation by a weight based on the cumulative occurrence time, and the previous unit section. Calculating an average amount of exercise during the exercise, and calculating a current physical activity level with reference to the immediately preceding physical activity level; And
(c) storing the current physical activity level calculated by the controller at a preset time interval;
The weight is a value obtained by dividing the unit time by the accumulated movement time generated during the unit time, and in the step (b), the control unit calculates a standard deviation with respect to the movement variation of each axis, and the standard deviation is preset. And recalculating the calculated current exercise amount twice when the reference deviation is less than the standard deviation. The method according to claim 7,
and (d) outputting a signal by the controller to display an icon corresponding to a current exercise level on a display unit. A computer program recorded on a computer-readable recording medium, which is written to perform the steps of the method for determining physical activity level according to any one of claims 5 to 8 in a computer.

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