JP4418089B2 - Start motion detection system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a system for detecting a start motion, and in particular, when starting in a swimming competition, a competitor on the start base starts a start motion on the start base before the start signal of the starter. The present invention relates to an operation detection system for detecting whether or not an operation has occurred.
[0002]
[Prior art]
In the conventional method for determining the action of a swimming competition event, a start signal is entrusted to the starter according to the instruction of the competition referee head, and the start of the race is started by the start signal. At that time, when the starter determined that a competitor on the start table had started before the start signal, the starter gave an incorrect start (false start). .
[0003]
[Problems to be solved by the invention]
Since the start of a swimming race can be any foot standing on the top board (50cm square shape) of the start platform, obtaining a detection method of the start motion is more various than the start of athletics. There is a problem and no satisfactory system has been obtained so far. Therefore, the start operation which is very important now is determined only by human eyes. Therefore, now that the one-time start system has been introduced, there is no data that can be used as reliable evidence when trouble occurs, and this may lead to a very large problem of no data. Further, the conventional relay takeover determination device for swimming competition cannot determine an unauthorized start, and the unauthorized start determination device used in athletics is difficult to detect information on the start operation of the athlete. There was a problem that.
[0004]
The present invention detects the position of the start operation as the amount of change in the physical quantity, and when a claim occurs, outputs data that provides evidence of an illegal start, and assists the visual determination of the starter. It is an object to realize a start operation detection system to be performed.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the start motion determination system according to the present invention attaches a pressure sensor to the start stand and detects the moment (position) at which the competitor is about to start. Instead of detecting the value when the pressure exceeds the standard value, the sensor outputs a signal from the sensor as a change in pressurization until the athlete enters the "ready" position after starting on the start platform The specific position at the moment the competitor is about to start is detected from the signal change state. Then, it is compared with the start signal signal position of the starter to determine whether or not it is an illegal start.
[0006]
In addition, the sensor has a sensor mounting position and a start stand structure that can respond sensitively to the athlete's start movement and output the change in the athlete's start movement as a large amount of change. A specific position can be easily detected.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. The present invention uses a sensor to capture the timing position of the moment when the competitor is going to start from the change state of the output signal from the sensor, and whether the timing position is before or after the position of the start meeting signal. A comparison is made to determine whether it is a false start. If the timing position is before the start meeting signal, it is determined that it is a false start, and if it is later, it is determined that the start is appropriate. The sensor uses a strain gauge type load cell. For example, there is LM-100K manufactured by Kyowa Denki Co., Ltd.
[0008]
FIG. 1 is a configuration diagram of a start motion detection system at the start of a swimming competition. An athlete is riding on the competition start table 1, and the sensor 2 installed on the start table 1 detects the start operation of the athlete on the start table 1 to detect the output. Output to. The start determination device 5 compares and outputs a specific position of the output signal from the output detection device 3 (the moment the competitor is about to start) and the start signal from the start pistol 4.
[0009]
In order to obtain an output waveform of the competitor's start motion (timing position at the moment when the competitor is about to start), it is preferable that the start platform can output the competitor's start motion sensitively. An example of the structure of the start stand for obtaining such an output waveform is shown in the schematic diagrams of FIGS.
[0010]
FIG. 2A is a plan view of the start table used in the embodiment of the present invention, which is provided with the fulcrum 7 and the sensor 2. FIG. 2B is a cross-sectional view taken along the line AA ′ in FIG. The starter base 10 can be a conventional base. A base plate 8 is attached to the top plate mounting bracket 9 of the gantry 10, and the sensor 2 is fixed to the base plate 8. The top plate 6 is supported by a fulcrum 7 and combined so as to ride on the sensor 2. When a rider rides on the top board 6, the sensor 2 is pressurized and outputs an electrical signal corresponding to the pressure. While the competitor is on the starting platform, the electrical signal continues to output. The sensor 2 is not located at the front edge of the top plate 6 but at the rear of 100 mm to 200 mm. By using the rear fulcrum and the front mounting position structure, the change in operation from the start to the start can be captured by the sensor 2 as a large change amount signal. The sensor 2 outputs a voltage signal having a waveform as shown in FIG. 4 (a) or FIG. 4 (b), for example, according to the state at the start. When two sensors are used, the average value of the two sensor output values is used as the sensor output value. FIG. 3 is a plan view of a start stand provided with a fulcrum 7 and one sensor 2 on the start stand. Similar to the case of using two sensors, a voltage signal as shown in FIG. 2A or FIG.
[0011]
FIG. 4A shows an appropriate start operation or a case close thereto, and FIG. 4B shows a false start. Fig. 4 shows the output from the sensor 2 installed on the start stand 1 as a change in pressurization and output as a voltage value from the rider's ride on the start stand to the start of preparation. FIG. 4 (a) and 4 (b), the vertical axis V represents the pressure applied to the sensor 2 (the voltage output value from the sensor 2), and the horizontal axis T represents the rider on the start platform 1. It takes time from the “ready” posture to the start.
[0012]
The point M of the maximum value of the waveform is the timing position at the moment when the foot is released from the start table 1 when the athlete jumps from the start table 1, and the position where pressure is most applied to the start table 1 and then descends rapidly. The waveform rises rapidly toward the point M, but rises suddenly after descending just before that point. The time B with respect to the lowest point N immediately before the sudden rise is the timing position at which the player has started an action to start.
[0013]
The starting position of the swimming race varies depending on the competitor. For example, there is a normal stance where both feet are aligned, or a method called crouching where the left and right feet are held back and forth as in athletics. Can be captured, so this time B can be determined as the timing position at which the player has started an action for starting.
[0014]
Time S (0 second) is a timing position of a start signal signal from the start pistol 4. It is determined whether the time B position is before or after the time S position, and it is determined whether it is an illegal start (false start), and data is output to the starter. In FIG. 4A, it can be said that the timing position time B at which the operation for starting from the start signal time S is started is later, and an appropriate start is made. FIG. 4B can be said to be an illegal start because there is a timing position time B before the operation for starting from the start signal time S. In the case of FIG. 4 (a), the athlete has clearly started after the start signal time S, but in the case of swimming, if the start timing position time B has not elapsed for more than a few seconds from the start signal position time S, it is said that the start is illegal. There is no provision. (In the case of athletics, it is an illegal start if 0.1 seconds or more have not passed.) Since it is currently left to the starter's judgment, the judgment based on the time difference between the start timing position time B and the start signal position time S is An appropriate setting can be made, and the starter can determine whether or not it is a false start based on this data.
[0015]
This determination operation will be described based on FIG. 1, FIG. 4, and FIG. FIG. 5 is a flowchart showing the flow of determination. At the starter's signal, the player rides on the start stand 1 and enters the posture of jumping in with the starter preparation (step A1 in FIG. 5). The start determination device 5 starts measurement with the preparation of this starter. That is, data acquisition is started. The time A shown in FIGS. 4A and 4B is the start time. After the start, the data output from the sensor 2 is recorded (step A2 in FIG. 5). A few seconds after the starter preparation signal, the start signal from the pistol 4 (step A 3 in FIG. 5) enters the start determination device 5. If the start signal from the pistol 4 does not enter the start determination device 5 even after several seconds after the starter preparation signal, step A3 in FIG. 5 is NO and the start is restarted. The information is cleared and starts again from step A1 in FIG. If step A3 in FIG. 5 is YES, the determination by the start determination device (step A4 in FIG. 5) starts. A comparison is made between the position of the timing position time B shown in FIG. 4 and the start signal position time S shown in FIG. When the position of the timing position time B is before the start signal time S, it means that the operation has been started improperly, that is, earlier than the start signal (see FIG. 4B), and the course number that has been illegally started is displayed (step in FIG. 5). A6) is performed, and it is determined that the start is illegal (step A8 in FIG. 5). When the timing position time B occurs after the start signal time S, it is determined whether or not the passage of time from the start signal is appropriate (step A5 in FIG. 5) (see FIG. 4A). In step A5 in FIG. 5, settings are made such as whether the start signal time S is incorrect or appropriate, or if it is determined that the start is incorrect if a predetermined time of several seconds or more has not elapsed. . A determination according to the setting is made, and a determination of NO or YES is made. In the case of NO, an illegal start course display (step A6 in FIG. 5) is displayed. If YES, it is determined that the start is appropriate (step A7 in FIG. 5). Furthermore, the output data can provide various display methods such as visual display methods (signal lamp, LED, printout, etc.), auditory display methods (headset, buzzer, etc.), and display on a scoreboard. Is possible.
[0016]
【The invention's effect】
A swim starter can stand any foot on the top board (50cm square). Under such circumstances, as described above, the present invention detects the start motion at the start of the swimming competition, determines whether there has been an illegal start (false start), and provides reliable evidence. Is output and held. And you can check the data at any time.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram according to an embodiment of the present invention.
FIG. 2A is a plan view of a start table having two sensors used in the present invention.
(B) is sectional drawing which followed the AA 'line of Fig.2 (a).
FIG. 3 is a plan view of a start stand having one sensor used in the present invention.
FIG. 4A is a waveform diagram when a start operation is measured, and shows a proper start or a start close thereto.
(B) is a waveform diagram when the start operation is measured, and shows an illegal start.
FIG. 5 is a flowchart showing a flow of determination according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Start stand 2 Detection sensor 3 Output signal detection device 4 Start pistol 5 Start determination device 6 Top plate 7 Support point 8 Base plate 9 Top plate mounting bracket 10 Mounting stand

Claims (4)

A sensor mounted on a start table for swimming that outputs an output signal of a voltage corresponding to a change in pressure applied by the athlete, and a detection device that detects a change in the output signal of the sensor and detects the timing of the start operation A determination device for comparing and determining the start sound generation timing and the start operation timing ;
The sensor is mounted at a position where the change in the starting motion of the competitor can be received as a large amount of change, and before the competitor starts, the waveform of the output signal of the sensor drops once just before suddenly rising toward the highest point. A start operation detection system , wherein the detection device detects a timing at which the waveform becomes the lowest point immediately before the sudden increase of the waveform as the timing of the start operation. The start table supports the top board on which the rider rides, the rear end of the top board, and the sensor is mounted at a position 100 mm to 200 mm behind the front end of the top board. The start operation detection system according to claim 1, further comprising a base plate placed on the sensor . One sensor, motion detection system of claim 2, characterized in that provided at a position which is received a change of contestants start operation as a large variation. Motion detection system of claim 2, wherein a multiple of several sensors, provided at a position which is received a change of competitor behavior as a large variation.

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