CN1771886A - Human body balance function detection method and training system - Google Patents

Abstract

The present invention is body balance function detecting method and training system. The system has one pressure detecting plate as energy converting unit to detect the feet pressure, sitting pressure and hand pressure of the standing body, sitting body and hand separately and to convert the pressure information into voltage signal; and four or eight pressure sensors below the pressure detecting plate to give out pressure related electric signals. All the signals are converted to find out the instantaneous pressure center position on the detecting plate, and the center position coordinates changing with time are recorded or displayed in plate display, the balance function may be analyzed and trained.

Description

Human body balance function detection method and training system

1. Technical field

The invention relates to a quantitative detection method of human body balance function and a system for rehabilitation training of human body balance function.

2. Background technology

Balance function examination refers to the examination of the functions of balance reflex systems such as the visual system, vagus nervous system, and proprioceptive system that play a role in maintaining body balance, as well as the examination of the cerebellum and brainstem functions that control the above systems. Quantitative detection of human balance function includes the center of gravity shake test, which is one of the main methods of human balance check. The shake of the body center of gravity in the upright (sitting) posture is traced, and the traced results are measured and analyzed. Based on the shaking records, not only can comprehensively grasp the balance disorder, evaluate the degree of balance disorder, disease course, and treatment effect, but also further capture the balance reflex system and central nervous system obstacles to maintain the body's balance function, and grasp the symptoms of vertigo and balance disorder cases. Sick, carry out lesion diagnosis.

3. Contents of the invention

The purpose of the present invention is to realize the quantitative detection of the balance function of the human body, especially the quantitative detection of the balance function of the upright and sitting upright of the human body and the function of finger trembling, and provide a rehabilitation function system, wherein the detection part that can be used independently It can be used for the patient's own rehabilitation function training.

The present invention is realized in the following way: the method for quantitative detection of human body balance function, through the upright, sitting upright and finger pressure detection board, completes the energy conversion component that converts the biped pressure, sitting pressure or hand pressure information of the human body into a voltage signal, and the pressure detection There are four (or eight) pressure sensors on the bottom of the plate, symmetrically distributed in the four corners (or eight directions) of the plate, when the pressure acts on the plate, the sensors at the four corners (or eight directions) will give Electrical signals of a certain size related to pressure, these signals can be converted to obtain the center position of the instantaneous pressure acting on the flat panel (detection board), and these center position coordinates that change at any time are recorded point by point or displayed on the display panel , you can perform various analyzes on the balance function or conduct training through the display on the display board. The coordinate origin of the test board force is the center of the test board, A(x ₁ , y ₁ ), B(x ₂ , y ₂ ).

The human body balance function rehabilitation training system includes: human body balance pressure signal detection device, real-time display of center of gravity position, balance function display panel and circuit. There are four (or eight) pressure sensors under the detection board, which are symmetrically distributed on the four corners (or eight directions) of the plate. When the pressure acts on the plate, the sensors at the four corners (or eight directions) will give An electrical signal of a certain size related to pressure is output. The output of the pressure sensor is connected to a multi-channel analog switch circuit, and the multi-channel analog switch circuit is connected to the A/D conversion circuit and connected to the input port of the microprocessor. The microprocessor and the connected memory As a data processing circuit and a data storage circuit, the output port of the microprocessor is connected to the drive circuit of the light-emitting diode through the I/O output circuit, the balance function display panel and the circuit are composed of the drive circuit of the light-emitting diode, and the balance function display panel is composed of the light-emitting diode array and Nixie tube composition. The driving circuit of the light emitting diode is connected with the light emitting diode.

The quantitative display panel (display screen) of the human body balance function is composed of a light-emitting diode array and a digital tube, and the digital tube is used to display the total weight. The LED array is used to display the center of gravity deviation. An array is composed of many diodes, and the patient judges the shift of his own center of gravity according to the change of the position of the lighted diodes.

The purpose of the detection system is to display the coordinates of the center of pressure (center of gravity), which is completed by strip-shaped light-emitting diodes; tube to complete. According to the principle of visual feedback, patients can adjust their center of gravity according to the brightness bar indication of the digital tube, so as to realize the training of rehabilitation function.

For both feet, on the control panel, each foot has a corresponding LED array, and the condition of each foot can be observed separately. In the analysis part, you can choose the observation method, namely: one foot, or the total center of gravity of both feet.

Analysis software, printing of analysis results. The whole system is roughly divided into two parts: detection and parameter analysis.

The detection part that can be used independently is mainly composed of a display screen and a pressure detection board. The pressure signal output of the seated, upright or finger pressure detection board is connected to the multi-channel analog switch circuit and the input port of the microprocessor, and the microprocessor is used for data processing and data storage. The detection part is self-contained and has a complete It has unique data detection and simple processing and display functions, can complete detection and preliminary analysis, and can be used independently without a computer. Such a structure can greatly reduce the cost of the detection part, and is expected to enter the family. Patients can use the principle of biofeedback to carry out regular rehabilitation training according to the real-time change of the center of gravity displayed on the display screen of the detection part. The data storage function of the detection part allows the patient to store the quantitative information of the balance function obtained through the detection part in the data box at home. The data) is fed back to the hospital, and then the parameter analysis part of the whole system makes a detailed analysis, so as to realize the function of telemedicine, which greatly facilitates the treatment and analysis of patients.

The parameter analysis part is realized by computer software. The parameter analysis part mainly analyzes the original data reflecting the balance function collected by the detection part, and gives physiological and medical indicators with evaluation and diagnosis significance. An important reference for lesions. The analysis software can run on the Windows platform and has a good man-machine interface. In order to facilitate the use and management of doctors, this system has the function of database management and the function of printing diagnosis results.

On the seat pressure plate, the finger pressure detects the change of pressure over time to detect finger tremors, the center of gravity shake of one foot upright and the balance function detection and analysis. By analyzing the real-time changes in the center of gravity or pressure vibration, the principle of biofeedback can be used for regular rehabilitation training. The data storage function of the detection part allows the patient to store the quantitative information of the balance function obtained through the detection part in the data box at home, which is convenient for the treatment and analysis of the patient; Enter the home.

The features of the present invention are:

1) Increased the balance function detection and analysis of sitting, finger trembling, and standing on one foot. And when the two feet are upright, you can observe the fluctuation of the center of gravity of each foot and the fluctuation of the total center of gravity of the human body.

2) It has an intuitive control panel to display the center of gravity deviation in real time, which is convenient for patients to use visual feedback for rehabilitation training of balance function.

3) ST (root mean square of swing), DA (percentage of left-right, front-back, inner-outside deviation of the center of gravity) and the time and area of the center of gravity distribution have been added to the analysis parameters.

4. Description of drawings

Fig. 1 is a block diagram of the human body balance function detection training system of the present invention

Fig. 2 is a block diagram of the detection part of the present invention

Fig. 3 is a block diagram of the display panel of the present invention

Fig. 4 is the analysis function block diagram of the present invention

Fig. 5 is the waveform chart that the present invention detects

Fig. 6 is the center of gravity locus diagram analysis result of the present invention

Fig. 7 is the power spectrum analysis result of the present invention

Fig. 8 is a structural schematic diagram of the display screen of the present invention

Fig. 9 is an analysis diagram of the stress situation of the detection board of the present invention

5. Specific implementation

See the attached picture: the whole system is generally divided into two parts: detection and parameter analysis. The overall structural block diagram is shown in Figure 1. The circuit structure of the detection system is mainly composed of multi-channel analog switches, A/D conversion circuits, data processing circuits and data storage circuits, as shown in Figure 2. There are many types of pressure sensors, using piezoelectric ceramic sensors: multi-channel analog switch circuit 4051, the typical type of A/D conversion circuit is: the model of the microprocessor can be 89C51, the output port of the microprocessor is through I The /O output circuit 8255 is connected to the driving circuit of the light emitting diode.

The display panel part of the detection part is mainly composed of light-emitting diode arrays and digital tubes. The display panel circuit digital tube is used to display the total weight. The LED array is used to display the center of gravity deviation. An array is composed of many diodes, and the patient judges the shift of his own center of gravity according to the change of the position of the lighted diodes.

For both feet, each foot has a corresponding LED array (four arrays?) on the control panel, allowing you to observe the condition of each foot separately. In the analysis part, you can choose the observation method, namely: one foot, or the total center of gravity of both feet.

Its purpose is to display the coordinates of the pressure center (center of gravity), which is completed by strip-shaped light-emitting diodes; the second is to display the actual pressure (body weight when standing upright), and this part can be displayed by a four-digit digital tube. Finish. According to the principle of visual feedback, patients can adjust their center of gravity according to the brightness bar indication of the digital tube, so as to realize the training of rehabilitation function. The structure of the display panel is shown in FIG. 3 . According to the shaking data of the center of gravity obtained by the detection part, it can be analyzed, and the analysis function block diagram is shown in Figure 4. The center-of-gravity trajectory map can be drawn by the data obtained by the detection part reflecting the continuous change of the center of gravity within a certain period of time. Based on this diagram, the type of shaking can be qualitatively judged, specifically divided into heart-seeking type, front-back type, left-right type, diffuse type, polycentric type, etc. Some of these shaking types are shaking characteristic of damage to specific parts of the nervous system. In the software analysis block diagram, the analysis function block diagram in Figure 4 also includes the description of the ST and DA parts. Corresponding to the three modes of standing, fingering and sitting, the analysis parameters are the same.

According to the calculation of the center of gravity locus diagram, parameters such as the peripheral area and the rectangular area can be obtained. From the shaking area, the degree of balance disturbance can be comprehensively grasped. The trajectory length analyzes the total trajectory length and the trajectory length per unit area, where the trajectory length per unit area can be used to measure proprioceptive postural control. Analysis shows that the balance function of the human body gradually improves with age, and is most stable between the ages of 20 and 50, and then gradually declines, and the decline is obvious after the age of 70.

The center of gravity shaking data is regarded as a random signal, and its power spectrum is estimated. The frequency range is generally selected from 0.02Hz to 10Hz. International benchmarks suggest analyzing the proportion of each frequency band (0.02Hz～0.2HZ, 0.2Hz～2HZ, 2HZ～10HZ) in the power spectrum. The power spectrum can reflect certain diseases and specific damage sites. For example, patients with unilateral vagus nerve dysfunction have a larger component in the direction of left and right shaking at 0.08 Hz to 0.2 Hz; Large; patients with cerebellar damage have a larger component in the direction of left and right shaking from 0.1Hz to 02Hz.

The following is the analysis system workflow:

(1) Patient basic information management

Users can access the patient database through the patient basic information management tool, including basic database operations such as adding, modifying, deleting, and querying patient records.

(2) Data collection

Users can choose the mode of data acquisition (including "upright", "sitting", "finger", etc.), the scanning speed of waveform display and the acquisition time. Data collection and waveform display are carried out synchronously, and can be stored automatically after collection.

(3) Data playback

Because data is stored losslessly, previously acquired data can be played back without distortion. In operation, it has zoom display, time measurement and other functions. (Figure 5)

(4) Analysis results

The trajectory diagram of the center of gravity and various parameters are given (Fig. 6).

Do power spectrum analysis for each direction waveform (Figure 7).

Figure 8 is a product structure diagram formed by the system. The products formed by the system are composed of inspection display unit, upright inspection device, sitting inspection device, hand pressure inspection device, PC host, liquid crystal display, color inkjet printer, etc.

Center of Pressure Calculation

The detection board is an energy conversion component that converts the human body's upright biped pressure, sitting pressure or hand pressure information into a voltage signal. The basic principle is: there are four pressure sensors under the pressure detection board, which are symmetrically distributed on the four Corner, when the pressure acts on the flat plate, the sensors at the four corners will give a certain size of electrical signal, these signals can be converted to obtain the center position of the instantaneous pressure acting on the flat plate (detection plate), and these changes at any time The coordinates of the center position of the machine can be recorded point by point or displayed on the display board, so that various analysis or training can be performed on the balance function.

The force on the test board is shown in Figure 1, and the origin of coordinates is set as the center of the test board, A(x ₁ , y ₁ ), B(x ₂ , y ₂ ), C(x ₃ , y ₃ ), D(x ₄ , y ₄ ) are the positions of the four sensors respectively. According to the principle of mechanics, the condition for maintaining the balance of the test board is:

F＝f ₁ +f ₂ +f ₃ +f ₄ (1)

FX＝f ₁ x ₁ +f ₂ x ₂ +f ₃ x ₃ +f ₄ x ₄ (2)

FY＝f ₁ y ₁ +f ₂ y ₂ +f ₃ y ₃ +f ₄ y ₄ (3)

E(X, Y) in the figure is the coordinate of the external pressure relative to the detection plate, that is, the position of the center of the equivalent pressure.

As shown in Figure 9, the force of the detection board

Since the sensors are symmetrically distributed, that is, x ₂ =-x ₁ , x ₂ =-x ₁ , x ₄ =x ₁ , y ₂ =y ₁ , y ₃ =-y ₁ , y ₄ =-y ₁ , it is substituted into ( 2), (3) formula get:

$\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="f"\; filenames="A20051009416400132.png"\; state="\{\{state\}\}">f</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="f"\; filenames="A20051009416400132.png"\; state="\{\{state\}\}">f</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="f"\; filenames="A20051009416400132.png"\; state="\{\{state\}\}">f</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="f"\; filenames="A20051009416400132.png"\; state="\{\{state\}\}">f</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$

$\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="f"\; filenames="A20051009416400132.png"\; state="\{\{state\}\}">f</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="f"\; filenames="A20051009416400132.png"\; state="\{\{state\}\}">f</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="f"\; filenames="A20051009416400132.png"\; state="\{\{state\}\}">f</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

Among them, f ₁ , f ₂ , f ₃ , and f ₄ change with time respectively, so the values of X and Y are also a set of functions that change with time, that is, X=X(t), Y=Y(t), and The electrical signal of the E(X, Y) value at each moment is recorded, and the information on the movement of the center position of the external pressure on the detection plate can be obtained. Then draw it point by point to obtain the pressure center moving curve or locus map.

In order to eliminate the influence of its actual size on the research problem, the above formulas (4) and (5) are normalized respectively, then the coordinates of point E (the center of external pressure) after normalization are:

$\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="f"\; filenames="A20051009416400132.png"\; state="\{\{state\}\}">f</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="f"\; filenames="A20051009416400132.png"\; state="\{\{state\}\}">f</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="f"\; filenames="A20051009416400132.png"\; state="\{\{state\}\}">f</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="f"\; filenames="A20051009416400132.png"\; state="\{\{state\}\}">f</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span>$

$\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="f"\; filenames="A20051009416400132.png"\; state="\{\{state\}\}">f</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="f"\; filenames="A20051009416400132.png"\; state="\{\{state\}\}">f</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="f"\; filenames="A20051009416400132.png"\; state="\{\{state\}\}">f</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 7</span>}<span\; class="notranslate">\; )</span>$

(6) and (7) are the coordinate expressions of the center of the external sitting pressure relative to the position of the detection plate.

As shown in Figure 8: display the coordinates of the center of pressure (center of gravity), this part is completed by the strip light-emitting diode. When the two feet in the screen display structure, each foot has a corresponding light-emitting diode array, and the situation of each foot is observed separately. The display structure of the screen is a cross-shaped light-emitting diode array. Each foot has a cross-shaped light-emitting diode array, the center position corresponds to the center of the foot, and a cross-shaped light-emitting diode array with both feet integrated.

Claims (9)

1. The method for quantitative detection of human body balance function, which is characterized in that the energy conversion components for converting the biped pressure, sitting pressure or hand pressure information of the human body into voltage signals through the upright, sitting upright and finger pressure detection boards, and the pressure detection board There are four (or eight) pressure sensors below, symmetrically distributed in the four corners (or eight orientations) of the plate, when the pressure acts on the plate, the four corners (or eight orientations) of the sensors give the The relevant electric signals of a certain size can be calculated by converting these signals to obtain the center position of the instantaneous pressure acting on the flat plate (detection board), and record these changing center position coordinates point by point or display them on the display board, that is, Various analyzes can be performed on the balance function or training can be performed through the display on the display board. 2. The method for quantitative detection of human body balance function according to claim 1, characterized in that the origin of the force-bearing coordinates of the test board is the center of the test board, A(x ₁ , y ₁ ), B(x ₂ , y ₂ ). 3. The method for quantitative detection of human balance function according to claim 1, characterized in that A(x ₁ , y ₁ ), B(x ₂ , y ₂ ), C(x ₃ , y ₃ ), D(x ₄ , y ₄ ) are the positions of the four sensors respectively, let E(X, Y) be the coordinates of the external pressure relative to the detection plate, that is, the position of the equivalent pressure center. Since the sensors are symmetrically distributed, that is, x ₂ =-x ₁ , x ₃ =-x ₁ , x ₄ =x ₁ , y ₂ =y 1 , y ₃ =-y ₁ , y ₄ = _{-y 1} , it is substituted into ( 2), (3) formula get: $\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; )</span>$ $\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$ Among them, f ₁ , f ₂ , f ₃ , and f ₄ change with time respectively, so the values of X and Y are also a set of functions that change with time, that is, X=X(t), Y=Y(t), and The electrical signal of the E(X, Y) value at each moment is recorded, and the information of the center position of the external pressure moving on the detection board can be obtained; The above equations (4) and (5) are normalized respectively, then the coordinates of point E (center of external pressure) after normalization are: $\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span>$ $\mathrm{<span\; class="notranslate">\; Y</span>}<span\; class="notranslate">\; =</span>\frac{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; )</span>}{{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; f</span>}}_{\mathrm{<span\; class="notranslate">\; 4</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 7</span>}<span\; class="notranslate">\; )</span>$ (6) and (7) are the coordinate expressions of the center of the external sitting pressure relative to the position of the detection plate. 4. Human body balance function rehabilitation training system, which is characterized in that it includes a human body balance pressure signal detection device, a real-time display of the position of the center of gravity, a balance function display panel and a circuit. There are four (or eight) pressure sensors under the detection board, which are symmetrically distributed on the four corners (or eight directions) of the plate. When the pressure acts on the plate, the four corners (or eight directions) ) sensor that gives a pressure-related electrical signal of a certain size, the output of the pressure sensor is connected to the multi-channel analog switch circuit, the multi-channel analog switch circuit is connected to the A/D conversion circuit and connected to the input port of the microprocessor. The device and the connected memory are used as a data processing circuit and a data storage circuit. The output port of the microprocessor is connected to the drive circuit of the light-emitting diode through the I/O output circuit. The balance function display panel and the circuit are composed of the drive circuit of the light-emitting diode, and the balance function display panel It is composed of LED array and digital tube. The driving circuit of the light emitting diode is connected with the light emitting diode. 5. The human body balance function rehabilitation training system according to claim 3, characterized in that the light-emitting diode array is used to display the deviation of the center of gravity. 6. The human body balance function rehabilitation training system according to claim 3, characterized in that it displays the coordinates of the center of pressure (center of gravity), and this part is completed by strip-shaped light-emitting diodes. 7. The human body balance function rehabilitation training system according to claim 3, characterized in that each foot has a corresponding light-emitting diode array when the two feet are in the screen display structure, and the situation of each foot is observed separately. 8. The human body balance function rehabilitation training system according to claim 3, characterized in that the screen display structure is a cross-shaped light-emitting diode array. 9. The human balance function rehabilitation training system according to claim 3, characterized in that each foot has a cross-shaped LED array, the center position corresponds to the center of the foot, and a cross-shaped LED array is provided for both feet. array.

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