CN208736429U - Athletic posture determining device - Google Patents
Athletic posture determining device Download PDFInfo
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- CN208736429U CN208736429U CN201821602291.1U CN201821602291U CN208736429U CN 208736429 U CN208736429 U CN 208736429U CN 201821602291 U CN201821602291 U CN 201821602291U CN 208736429 U CN208736429 U CN 208736429U
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- acceleration
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- posture determining
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Abstract
This application discloses a kind of for detecting the athletic posture athletic posture determining device of object under test.The athletic posture determining device includes acceleration measurement device, for measuring the acceleration value of object under test in a plurality of directions；Time-frequency domain conversion equipment, for carrying out time-frequency domain data conversion to the acceleration value of the object under test in a plurality of directions to obtain the amplitude of frequency domain data in each direction；And device is compared to determine, the amplitude of frequency domain data in each direction is compared with a reference value in predetermined respective direction, and determine the state of object under test according to the result of the comparison.
Description
Technical field
This application involves the athletic posture determining devices of the athletic posture for detecting object under test to be particularly related to base
Time-frequency domain conversion is carried out in the measurement data of acceleration transducer to judge the current motion state of object under test and inclination appearance
The athletic posture determining device of state.
Background technique
The current acceleration that acceleration transducer in perambulator in the prior art is generally used only for detection car body is gone forward side by side
And body speed of vehicle is calculated, and sound an alarm or execute automatically safety after the speed of service of perambulator is beyond safe range
Operation.However, the dangerous situation that existing perambulator is not in heeling condition to car body makes specific aim protection, thus seriously
Influence baby safety coefficient, most commonly seen scene be exactly when perambulator be in certain slope road surface when (go up a slope/under
Slope), if car body is detached from adult control at this time, it will cause the serious consequence for being difficult to bear.
It is usually used in the application scenarios that other need to measure the athletic posture and/or inclined degree of object
The devices such as obliquity sensor execute precise measurement.Existing obliquity sensor is actually MCU, accelerometer, analog-to-digital conversion
Circuit, communication unit are integrated on very small size of circuit board, can obtain static conditions or it is quasi-static under the conditions of
Gravity vertical axis and acceleration transducer sensitive axis between angle (i.e. inclination angle), however do not introducing gyroscope device
In the case of, this kind of obliquity sensor can not make accurate measurement for the object tilt state under dynamic condition.
However introduce gyroscope in detection module and will lead to higher cost, it is not suitable for not needing accurately obtaining object
Current tilt angle only needs to make heeling condition the case where dynamic determines.
Utility model content
In view of the problems of the existing technology, this application provides a kind of athletic posture determining devices, comprising:
Acceleration measurement device, for measuring the acceleration value of object under test in a plurality of directions；
Time-frequency domain conversion equipment, for carrying out time domain-frequency to the acceleration value of the object under test in a plurality of directions
Numeric field data is converted to obtain the amplitude of frequency domain data in each direction；And
Device is compared to determine, by the benchmark in the amplitude of frequency domain data in each direction and predetermined respective direction
Value is compared, and determines the state of object under test according to the result of the comparison.
Optionally, according to the athletic posture determining device of the application, wherein comparing to determine that device is configured to will be described each
The amplitude of the DC component in frequency domain data on direction and the inclination determinating reference value in predetermined respective direction carry out
Compare, and determines the heeling condition of object under test according to the result of the comparison.
Optionally, according to the athletic posture determining device of the application, wherein compare to determine device be configured to calculate it is described every
The amplitude summation of frequency domain data on a direction, by the movement decision threshold in the amplitude summation and predetermined respective direction
Value is compared, and determines that the object under test is in when the amplitude summation being calculated is greater than the movement decision threshold
Motion state.
Optionally, according to the athletic posture determining device of the application, wherein compare to determine device be configured to calculate it is described every
The ratio of low frequency component in frequency domain data and the amplitude summation on a direction, by the ratio to it is predetermined corresponding
Acceleration decision threshold on direction is compared, and determines institute when the ratio being calculated is greater than the acceleration decision threshold
It states object under test and is in acceleration or deceleration state, wherein the low frequency component is the sum of the amplitude of sampled point that frequency is lower than 5Hz.
Optionally, it is configured to according to the athletic posture determining device of the application when in a horizontal state in the object under test
The acceleration value in multiple directions is measured by the acceleration measurement device, and is calculated often by the device that compares to determine
The average value is simultaneously used as the inclination determinating reference value in respective direction by the average value of the acceleration value on a direction.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present application, so that the application's is other
Feature, objects and advantages become more apparent upon.The illustrative examples attached drawing and its explanation of the application is for explaining the application, not
Constitute the improper restriction to the application.In the accompanying drawings:
Fig. 1 is the structural schematic diagram according to the athletic posture determining device of the embodiment of the present application；
Fig. 2 is the schematic diagram handled according to the installation calibrating of the athletic posture determining device of the embodiment of the present application；And
Fig. 3 is to show the example view being mounted on trolley according to the athletic posture determining device of the embodiment of the present application
Figure.
Specific embodiment
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only
The embodiment of the application a part, instead of all the embodiments.Based on the embodiment in the application, ordinary skill people
Member's every other embodiment obtained without making creative work, all should belong to the model of the application protection
It encloses.
It should be noted that the description and claims of this application and term " first " in above-mentioned attached drawing, "
Two " etc. be to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that using in this way
Data be interchangeable under appropriate circumstances, so as to embodiments herein described herein.In addition, term " includes " and " tool
Have " and their any deformation, it is intended that cover it is non-exclusive include, for example, containing a series of steps or units
Process, method, system, product or equipment those of are not necessarily limited to be clearly listed step or unit, but may include without clear
Other step or units listing to Chu or intrinsic for these process, methods, product or equipment.
In this application, term " on ", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outside",
" in ", "vertical", "horizontal", " transverse direction ", the orientation or positional relationship of the instructions such as " longitudinal direction " be orientation based on the figure or
Positional relationship.These terms are not intended to limit indicated primarily to better describe the utility model and embodiment
Device, element or component must have particular orientation, or be constructed and operated with particular orientation.
Also, above-mentioned part term is other than it can be used to indicate that orientation or positional relationship, it is also possible to for indicating it
His meaning, such as term " on " also are likely used for indicating certain relations of dependence or connection relationship in some cases.For ability
For the those of ordinary skill of domain, the concrete meaning of these terms in the present invention can be understood as the case may be.
In addition, term " installation ", " setting ", " being equipped with ", " connection ", " connected ", " socket " shall be understood in a broad sense.For example,
It may be a fixed connection, be detachably connected or monolithic construction；It can be mechanical connection, or electrical connection；It can be direct phase
It even, or indirectly connected through an intermediary, or is two connections internal between device, element or component.
For those of ordinary skills, can understand as the case may be above-mentioned term in the present invention specifically contain
Justice.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
According to this application provides a kind of athletic posture determining devices 10.As shown in Figure 1, the athletic posture determining device 10
Include:
Acceleration measurement device 20, for measuring the acceleration value of object under test in a plurality of directions；
Time-frequency domain conversion equipment 30, for carrying out time domain-to the acceleration value of the object under test in a plurality of directions
Frequency domain data is converted to obtain the amplitude of frequency domain data in each direction；And
Device 40 is compared to determine, by the base in the amplitude of frequency domain data in each direction and predetermined respective direction
Quasi- value is compared, and determines the state of object under test according to the result of the comparison.
In some embodiments, which includes that 3 axle acceleration sensors or 6 axle accelerations sense
Device, for measuring the acceleration value in each axial direction.
In some embodiments, which includes digital signal processor (DSP), DSP construction
To be able to carry out discrete Fourier transform (DFT) processing or executing Fast Fourier Transform (FFT) (FFT) processing.
In some embodiments, the above-mentioned device 40 that compares to determine includes comparator circuit, can fill acceleration analysis
Set 20 or the output data of time-frequency domain conversion equipment 30 be compared with pre-stored a reference value, and it is to be measured to export instruction
The lateral attitude of object or the signal of motion state.
In some embodiments, device 40 is compared to determine to be configured to the direct current in the frequency domain data in each direction
The amplitude of component is compared with the inclination determinating reference value in predetermined respective direction, and according to the result of the comparison really
Determine the heeling condition of object under test.
In some embodiments, device 40 is compared to determine to be configured to calculate the amplitude of the frequency domain data in each direction
The amplitude summation is compared by summation with the movement decision threshold in predetermined respective direction, and is worked as and calculated
To amplitude summation be greater than the movement decision threshold when determine that the object under test is kept in motion.
In some embodiments, compare to determine device 40 be configured to calculate it is low in the frequency domain data in each direction
The ratio of frequency component and the amplitude summation carries out the acceleration decision threshold on the ratio and predetermined respective direction
Compare, and determines that the object under test is in acceleration or deceleration when the ratio being calculated is greater than the acceleration decision threshold
State, wherein the low frequency component is the sum of the amplitude of sampled point that frequency is lower than 5Hz.In some embodiments, low frequency point
Amount can be lower than the sum of the amplitude of sampled point of 2Hz for frequency.
In some embodiments, it is configured to be in the object under test according to the athletic posture determining device 10 of the application
The acceleration value in multiple directions is measured by the acceleration measurement device when horizontality, and is compared to determine by described
Device, which calculates the average value of acceleration value in each direction and the average value is used as to the inclination in respective direction, determines base
Quasi- value.
In some embodiments, which is fixed on trolley.Particularly the object under test can
Think, is fixed on the pushchair according to the athletic posture determining device 10 of the application.
In some embodiments, in each measurement circulation, reading acceleration transducer first is in x, y, the measurement in z-axis
Value is simultaneously stored in queue xQueue, yQueue, the zQueue being stored in registers respectively, and the length of each queue is set as n
(n takes 128 in some instances) shifts queue whenever there is a new measured value to arrive, and earliest measured value is from team
It arranges tail portion to remove, new measured value is added to head of the queue.
After obtaining each axial acceleration measurement, time-frequency domain conversion process is carried out to the value in queue.?
In some embodiments, calculation processing is carried out for the ease of application single-chip microcontroller/microprocessor, is used discrete Fourier transform (DFT)
It is handled.In some instances using Fast Fourier Transform (FFT) processing (FFT).
It is handled by discrete Fourier transform, using integer algorithm, the sampled signal of time domain can be transformed into frequency
Domain, in order to analyze signal characteristic.Next Fourier transformation result is standardized, and calculates each Frequency point
Amplitude, can determine according to the result that the amplitude of frequency domain data is compared with a reference value in predetermined respective direction
The lateral attitude and motion state of object under test.
In some embodiments, by the amplitude of the DC component in the frequency domain data in each direction and predefine
Respective direction on inclination determinating reference value be compared, and according to the result of the comparison determine object under test it is skewed
State.
In some embodiments, obtained after discrete Fourier transform DC component (first value in DFT result,
Frequency is the amplitude at zero point), the value of the DC component reflects the average value of acceleration transducer measured value, the DC component
And the difference of the predetermined inclination determinating reference value of corresponding direction reflects inclination conditions of the object under test to all directions.Its
Described in inclination determinating reference value be to be in a reference value measured under horizontal stationary state when object under test, later in association with
Fig. 2 is described in detail.
In some embodiments, the amplitude summation for calculating the frequency domain data in each direction, by the amplitude summation
It is compared with the movement decision threshold in predetermined respective direction, and when the amplitude summation being calculated is greater than described
Determine that the object under test is kept in motion when moving decision threshold.
Above-mentioned amplitude summation is calculated all in the case where carrying out time-frequency domain conversion using discrete Fourier transform
The resulting numerical value of the sum of amplitude of Frequency point；In addition using other Fourier's changing methods, which can
Integral with the amplitude curve corresponded in frequency range.
When object under test remains static, acceleration transducer itself has measurement noise, each frequency after DFT transform
Rate point has lesser amplitude, and amplitude summation is smaller, and works as object under test (such as the pushchair mentioned in background technique)
When movement, due to Uneven road, jolts etc. and the amplitude summation of each Frequency point to be caused to increase.It in some embodiments can will be
The mean value of the amplitude summation of the frequency domain data obtained under stationary state is used as above-mentioned movement decision threshold, and is stored in memory
In.When the frequency domain data amplitude summation obtained in real time is greater than the movement decision threshold, that is, it can determine that object under test is in movement
State, and situations such as can also reflect pavement roughness.
In some embodiments, which also performs the following operations:
The ratio for calculating the low frequency component and the amplitude summation in the frequency domain data in each direction, by the ratio
Value is compared with the acceleration decision threshold in predetermined respective direction, and when the ratio being calculated is greater than described add
Determine that the object under test is in acceleration or deceleration state when fast decision threshold.
The ratio between low frequency component and the above-mentioned amplitude summation in frequency domain data in each direction are calculated, frequency domain width can be obtained
Low frequency accounting in value, the low frequency accounting are able to reflect out low frequency accounting and reflect the slowly varying feelings of the acceleration of object under test
Condition, wherein the higher situation of low frequency accounting shows that object under test is in acceleration or deceleration state.Above-mentioned acceleration decision threshold is root
The low frequency accounting numerical value obtained according to actual conditions measurement can determine that be measured when the low frequency accounting obtained in real time is higher than the threshold value
Object is in acceleration or deceleration state, and in other words, can determine that object under test has when low frequency accounting is higher than threshold value is worth
Vigilant acceleration.
Due to, there are certain installation error, pacifying each time when athletic posture determining device to be installed on object under test
When dress, the direction of each reference axis of acceleration transducer is all had differences, it is therefore desirable to after installation is complete put object under test
It is placed on horizontal platform and it is calibrated, determine the original state of acceleration transducer.Specific calibration process such as Fig. 2 institute
Show, be described as follows:
(1) calibration key triggering calibration starts；
(2) measured value for reading acceleration transducer x, y, z axis, deposits in BuffX [n], BuffY [n], BuffZ respectively
In [n], wherein n is the measurement value sensor quantity read needed for calibration, can take 1024 in some instances；
(3) whether terminate, if be not finished, repeat (2) and be read out, otherwise carry out in next step if judging to read；
(4) difference xDiff, yDiff, zDiff of the maxima and minima of x, y, z axis measured value are calculated separately
(5) xDiff, yDiff, zDiff are compared with pre-set maximum change threshold T respectively, if there is
One difference is more than that T is then calibrated and failed, and re-execute the steps (2).Wherein maximum change threshold T is to be surveyed according to acceleration transducer
A value for measuring noise setting, takes 2 times of measurement noise, if at least one of xDiff, yDiff, zDiff are more than the value,
Then show that current object under test plays pendulum, it should reappose level and calibrate；
(6) average value xAvg, yAvg, zAvg of x, y, z axis measured value are calculated；
(7) it is saved xAvg, yAvg, zAvg as inclination determinating reference value, for that will be obtained in real time in measurement
Acceleration value be compared the lateral attitude to determine object under test with the inclination determinating reference value of corresponding direction；
(8) calibration terminates.
Obviously, those skilled in the art should be understood that each module of above-mentioned the application or each step can be with general
Computing device realize that they can be concentrated on a single computing device, or be distributed in multiple computing devices and formed
Network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are stored
Be performed by computing device in the storage device, perhaps they are fabricated to each integrated circuit modules or by they
In multiple modules or step be fabricated to single integrated circuit module to realize.In this way, the application be not limited to it is any specific
Hardware and software combines.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (10)
1. a kind of athletic posture determining device characterized by comprising
Acceleration measurement device, for measuring the acceleration value of object under test in a plurality of directions；
Time-frequency domain conversion equipment, for carrying out time-frequency domain number to the acceleration value of the object under test in a plurality of directions
According to conversion to obtain the amplitude of frequency domain data in each direction；And
Compare to determine device, by a reference value in the amplitude of frequency domain data in each direction and predetermined respective direction into
Row compares, and determines the state of object under test according to the result of the comparison.
2. athletic posture determining device according to claim 1, which is characterized in that it is described compare to determine device be configured to by
The amplitude of DC component in the frequency domain data in each direction and the inclination in predetermined respective direction determine base
Quasi- value is compared, and determines the heeling condition of object under test according to the result of the comparison.
3. athletic posture determining device according to claim 1, which is characterized in that the device that compares to determine is configured to count
The amplitude summation for calculating the frequency domain data in each direction, by the fortune in the amplitude summation and predetermined respective direction
Dynamic decision threshold is compared, and when the amplitude summation being calculated be greater than the movement decision threshold when determine it is described to be measured
Object is kept in motion.
4. athletic posture determining device according to claim 3, which is characterized in that the device that compares to determine is configured to count
The ratio of low frequency component and the amplitude summation in the calculation frequency domain data in each direction, it is by the ratio and true in advance
Acceleration decision threshold in fixed respective direction is compared, and when the ratio being calculated is greater than the acceleration decision threshold
When determine that the object under test is in acceleration or deceleration state, wherein the low frequency component is sampled point of the frequency lower than 5Hz
The sum of amplitude.
5. athletic posture determining device according to claim 3, which is characterized in that the athletic posture determining device construction
For the object under test it is when in a horizontal state by the acceleration measurement device measure multiple directions on acceleration value,
It is used as respective party by the average value for comparing to determine the acceleration value that device calculates in each direction, and by the average value
Upward inclination determinating reference value.
6. athletic posture determining device according to claim 1, which is characterized in that the time-frequency domain conversion equipment packet
Include digital signal processor (DSP).
7. athletic posture determining device according to claim 6, which is characterized in that the digital signal processor (DSP)
It is configured to execute discrete Fourier transform (DFT) processing.
8. athletic posture determining device according to claim 6, which is characterized in that the digital signal processor (DSP)
It is configured to execute Fast Fourier Transform (FFT) (FFT) processing.
9. athletic posture determining device according to claim 1, which is characterized in that the acceleration measurement device includes 3
Axle acceleration sensor.
10. athletic posture determining device according to claim 1, which is characterized in that the acceleration measurement device includes 6
Axle acceleration sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821602291.1U CN208736429U (en) | 2018-09-29 | 2018-09-29 | Athletic posture determining device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821602291.1U CN208736429U (en) | 2018-09-29 | 2018-09-29 | Athletic posture determining device |
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| CN208736429U true CN208736429U (en) | 2019-04-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238272A (en) * | 2018-09-29 | 2019-01-18 | 上海阿柚信息科技有限公司 | Athletic posture determines method and athletic posture determining device |
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2018
- 2018-09-29 CN CN201821602291.1U patent/CN208736429U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109238272A (en) * | 2018-09-29 | 2019-01-18 | 上海阿柚信息科技有限公司 | Athletic posture determines method and athletic posture determining device |
| CN109238272B (en) * | 2018-09-29 | 2024-03-08 | 上海阿柚信息科技有限公司 | Motion gesture determination method and motion gesture determination device |
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