JP2535306B2 - Effective batting judgment device for batting type martial arts - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an effective batting determination device for batting type martial arts, and can be used for the determination of martial arts games such as fencing, kendo, boxing, and karate.

[0002]

BACKGROUND ART Martial arts such as fencing, kendo, boxing, and karate are striking-type martial arts in which the striking of a determined part of the opponent's body is effective. Among them, in fencing, an exclusive umpire is used to judge whether or not the hit is an effective hit, and such an umpire detects a hit by a sword, and this hit is against a predetermined part of the opponent. It is to detect whether or not it has been performed. That is, the tip of the sword used for competition is provided with a switch mechanism that opens and closes the electrical contact when a predetermined force is applied,
The presence or absence of a hit is detected by this switch mechanism. Then, each athlete wears an attire to which a predetermined voltage is applied, and the sword of one athlete and the attire of the other athlete are connected to a voltage detector provided on the referee's device, and the sword and the attire are attached. The electric current flowing when touched is detected, and thereby it is detected that the impact is applied to a predetermined portion.

[0003]

In such a conventional umpire, the continuity detection method is used to detect the electric current flowing when the sword and the uniform are touched. Wires must be connected to the umpire and these wires cling to the competitors around the time of the competition,
There is a problem of depriving athletes of freedom of movement. In addition, the contact resistance between the sword and the competition clothes when hit is not reproducible,
Since the current must be detected at the moment of impact,
In order to realize reliable hit detection, it is necessary to apply a relatively high voltage to the competition clothes. For this reason, a commercial power source is required as a power source for the umpire device, and the competition place is limited to indoors such as a gymnasium, and there is a problem that the athlete may be electrocuted.

An object of the present invention is to provide an effective batting determination device for batting type martial arts which can secure the freedom of movement of a player.

[0005]

SUMMARY OF THE INVENTION A first invention of the present invention is a striking tool having a striking portion provided with a converter for converting a mechanical shock into an electric signal, and an electrically conductive member to which a predetermined voltage is applied. When a plurality of athletes wearing a sportswear with a certain impacted part compete in the competition, one athlete hits the impacted part of another athlete's attire with his or her own impact tool. Is an effective batting determination device for batting type martial arts, which detects an batting by receiving an electric signal of a voltage generation unit that generates an AC voltage of a predetermined frequency to be applied to the attire and the batting tool. An impact detection unit, a frequency detection unit that is electrically coupled to the striking tool and detects that the striking unit and the striking unit are in contact with each other by detecting a predetermined frequency of the AC voltage, and their impacts. Of the detector and frequency detector Striking detected by the impact detection section based on the square of the signal is characterized by comprising an effective hitting determining unit for determining that it is a blow to the struck portion of the other competitors.

According to a second aspect of the present invention, when a plurality of athletes wearing a striking tool having a striking portion provided with a converter for converting a mechanical impact into an electric signal, one athlete is required to compete. An effective striking device for striking type martial arts, which determines that a player has hit a predetermined position of another player with his or her own striking tool, and an alternating current of a predetermined frequency applied to a position other than the predetermined position of each player. A voltage generator that generates a voltage, an impact detector that receives an electrical signal from the impact tool to detect impact, and the impact part that is electrically coupled to the impact tool and that is other than the predetermined location of the opponent. A frequency detection unit that detects a contact by detecting a predetermined frequency of the AC voltage, and that the impact detected by the impact detection unit based on the signals of the impact detection unit and the frequency detection unit is an effective hit. Judgment Characterized by comprising an effective hitting determining unit that.

[0007]

In the first aspect of the present invention as described above, the method of detecting a specific frequency is adopted. Therefore, even if the striking portion of the opponent and the striking portion of the opponent are not connected by an electric wire, the voltage is applied to the striking portion. Since the frequency of the AC voltage can be detected, it is not necessary to connect the swords and competition clothes of both competitors with electric wires as in the conventional conduction detection type. Further, in the frequency detection method, unlike the case of directly detecting the signal level of current or voltage, it becomes possible to detect even a weak signal level. Therefore, regardless of the contact resistance of the sword and competition clothes at the time of striking, the effective striking can be surely detected, and since the applied voltage can be weak, a large power source as a signal source can be used. This makes it unnecessary to use an external power supply line and a small dry battery can be adopted. Therefore, it is possible to eliminate any electric wiring clinging to the athlete, thereby achieving the above-mentioned object.
In addition, in the second invention of the present invention, it is difficult to apply an AC voltage to a predetermined location such as a competition in which the range where the impact is effective is the entire body, or boxing where the area where there is almost no clothing is impacted. Even in such a case, it is possible to distinguish between the predetermined location and the location other than the predetermined location by the AC voltage applied to the location other than the predetermined location, and it is possible to determine that the hit is effective. As a result, the same action as that of the first aspect of the invention is obtained, and the above-described object is achieved thereby.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows effective fencing decision devices 10A, 10B for fencing according to a first embodiment of the present invention. Each judge 10
A and 10B are for flutes among the fencing disciplines, and are housed in small cases that can be carried around the waists of athletes 1 and 2, respectively. The judging devices 10A and 10B are provided with the same electric circuit. The determiner 10A generates an AC voltage having a predetermined frequency to be applied to the sword 3A and the metal jacket 4A of the athlete 1, and strikes the sword 3A of the athlete 1 and a predetermined part of the athlete 2 at the time of this impact. It detects the predetermined frequency of the AC voltage applied to the. The metal jacket 4A worn by the competitor 1 is the same as the conventional sports jacket, and is made of electrically conductive fibers and is entirely the hit portion. A part of the metal jacket 4A is connected to the judgment device 10A by an electric wire.
An AC voltage with a frequency AkHz of 10A is applied to the whole. The competition sword 3A is the same striking tool as a conventional competition sword, and the tip is a striking part, and a switch mechanism having an electric contact that opens and closes when a predetermined force is applied to this striking part is provided. ing. The base end of the sword 3A is connected to the judging device 10A by an electric wire, and an AC voltage of the frequency CkHz generated by the judging device 10A is applied to almost the entire sword 3A.

The determiner 10B generates an AC voltage of a predetermined frequency to be applied to a predetermined part of the athlete 2 and the athlete 2
The sword 3B is hit, and an AC voltage of a predetermined frequency applied to a predetermined part of the player 1 at the time of this hit is detected. The metal jacket 4B worn by competitor 2 is
It is of the same style as competitor 1's metal jacket 4A, and an AC voltage with a frequency of BkHz is applied by connecting to the determiner 10B. The sword 3B for competition is the same as the sword 3A of the competitor 1, and an AC voltage having a frequency of DkHz is applied by connecting to the judging device 10B. A metal pist 5 which is a metal rug is laid on the floor of the stadium where the competition is held, and an AC voltage having a frequency EkHz is applied to the metal pist 5 by an oscillator 6. Also, metal jackets 4A, 4B, swords 3A, 3
B and the frequency of each AC voltage applied to the metal fix 5 are set to different values, for example, A = 100kHz, B = 110kHz, C = 15kHz, D = 20k.
Values such as Hz and E = 35kHz can be set.

FIG. 2 schematically shows an electric circuit of the decision devices 10A and 10B. This electric circuit is driven by a small power source such as a dry battery, and as described above, the determiner 10A,
Since the same 10B is used, here the decision device 10A
Will be described and the description of the determiner 10B will be omitted. The judging device 10A detects a predetermined voltage by detecting the AC voltage applied to the sword 3A and the metal jacket 4A, the AC voltage applied to the other party's metal jacket 4B, and the impact by the sword 3A. Detection unit 30 that sends out the signal of
And a determination unit 40 that determines whether or not the strike with the sword 3A is effective based on a signal from the detection unit 30, and a metal jacket.
A timer circuit 50 that determines the timing of cutting off the AC voltage applied to 4B is provided.

The voltage generator 20 includes an oscillator 21 for generating an AC voltage applied to the metal jacket 4A, a battery 22 for generating a DC voltage similarly applied to the metal jacket 4A, and a sword.
And an oscillator 23 that generates an AC voltage applied to 3A. Of these, a switch element 21A that is opened by a signal from the timer circuit 50 is connected to the output side of the oscillator 21.

The detection unit 30 detects the opening and closing of the electrical contact 7 at the tip of the sword 3A to detect the impact by the sword 3A, and the frequency BkHz of the voltage applied to the metal jacket 4B of the athlete 2. Of the frequency applied to the sword 3B of the athlete 2 f detecting section 33 for detecting the frequency DkHz (hereinafter referred to as "f detecting section") F detector for detecting frequency EkHz
34 and a DC detector 35 for detecting the DC voltage applied to its own metal jacket 4A.

Of these, the impact detection unit 31 detects the impact due to the opening of the electrical contact 7, and the determination unit
The impact signal "a" is sent to 40, and is configured to include a waveform shaping circuit that removes chattering noise generated when the electrical contact 7 is opened. The f detector 32 is
When the frequency BkHz is detected, an effective surface signal "B", which means that the impact hits the opponent's metal jacket 4B, which is an effective surface, is effective, is sent to the determination unit 40.
By detecting the frequency DkHz, the f detection unit 33 determines the disregard signal “C”, which means that the hit is against the sword 3B of the opponent, which is an invalid surface, and should be ignored.
To be sent to. The f detection unit 34 sends to the determination unit 40 an ignore signal "d", which means that the impact is hit by the metal piste 5 that is an ineffective surface and should be ignored, by detecting the frequency EkHz. Is. DC
The detection unit 35 detects a contact between the sword 3A and the metal jacket 4A by detecting a direct current flowing when the sword 3A of the self contacts the metal jacket 4A of the own. When the sword 3A comes into contact with the metal jacket 4A, the AC voltage generated by each of the determiners 10A and 10B interferes with each other and correct detection cannot be performed. Therefore, the detection of the DC current causes the DC detector 35 to detect the detector 30. Signal "ro"-"d"
Judgment invalid signal "e" means that is invalid
It is supposed to be sent to 40.

As shown in FIG. 3, the f-detection unit 32 is a sword.
Matching circuit 32A that electrically matches the coupling with 3A and sword 3A
Active band filter circuit 32B that selectively amplifies only the electrical signal from the sensor that has a frequency to be detected, and rectifier circuit 32C that rectifies the AC output of the active band filter circuit 32B.
And a comparison circuit 32D that sends out a predetermined electric signal when the DC voltage output from the rectifier circuit 32C is higher than a predetermined reference voltage. Of these, the matching circuit 32A
Has a coupling capacitor 32E that forms a capacitor coupling with the sword 3A and has a low impedance for an electric signal of a frequency to be detected, and an LC resonance circuit 32F that resonates with an electric signal of a frequency to be detected. is there. LC resonant circuit
32F is composed of a coil and a capacitor. With this matching circuit 32A, the DC component of the signal input to the f detection unit 32 is cut by the coupling capacitor 32E, and the frequency B
A signal in the vicinity of kHz passes through the coupling capacitor 32E, and only the signal of frequency BkHz that resonates with the LC resonance circuit 32F is selected and input to the active band filter circuit 32B. Note that the other f detectors 33 to 34
Since the circuit configuration is the same as that of the detection unit 32, description thereof will be omitted. However, in each of the f detectors 33 to 34, the frequency set in the matching circuit and the active band filter is set to a unique frequency to be detected by each.

Returning to FIG. 2, the determination unit 40 determines the effectiveness of the batting based on the signal from the detection unit 30.
And the light emitting diodes 42A, 42B, 42C and the buzzer 42D inform the competitors 1, 2 etc. of the judgment of the logical operation unit 41.
It is provided with. Of these, the logical operation unit 41 is shown in FIG.
, AND circuits 41A, 41B and OR circuit
It is configured to include 41C, etc. AND circuit 41A
Is an impact signal "a" generated by the impact of the sword 3A,
Further, it is determined that the striking is effective by simultaneously inputting both the effective surface signal “b” striking generated by the striking of the metal jacket 4B. Also, this AN
When the D circuit 41A determines the effective hit, the electric power signal is applied to the terminal "F" of the determination unit 40, and the light emitting diode 42A connected to the terminal "F" is turned on to display the effective hit. ing.

The AND circuit 41B uses the inverter 41D to invert the impact signal "a" generated by the impact of the sword 3A and the ignore signal "ha" generated by the impact of the opponent's sword 3B, and the metal pit. It is determined that the hit is invalid by simultaneously inputting a signal obtained by inverting the neglected signal "d" generated by hitting 5 on the inverter 41E. Specifically, the AND circuit 41B is
When the batting of the sword 3A is performed on a place other than the metal jacket 4B of the opponent 2 of the opponent, the judgment is performed, a power signal is applied to the terminal “TO” of the judgment unit 40, and the terminal “TO” is connected. The light emitting diode 42B is turned on to display an invalid hit. Even if the opponent's sword 3B or metal fix 5 is hit, the hit is ignored and nothing is displayed.

The determination invalidation signal "e" input from the detection unit 30 to the determination unit 40 is input to the driver 41F and converted into a power signal. Judgment invalid signal “e” converted to electric power signal
Is a light-emitting diode connected to the terminal “H” of the determination unit 40
42C is turned on, and the invalid display is displayed. When the OR circuit 41C receives either the valid hit determination signal from the AND circuit 41A, the invalid hit determination signal from the AND circuit 41B, or the invalid judgment signal “e” from the detection unit 30, the terminal It sends a ringing signal to the buzzer 42D connected to the buzzer 42D.

When the input of the timer circuit 50 is connected to the terminal "f" of the judging section 40 and the judging section 40 judges that the hit is valid, the voltage generating section 20 of the voltage generating section 20 receives a predetermined time (for example, 2 seconds). The switch element 21A provided in the oscillator 21 is opened. As a result, the AC voltage of the oscillator 21 is cut off when one of the athletes 1 and 2 first obtains a valid hit, and the above-mentioned predetermined time elapses. It is not displayed.

In this embodiment, when the athlete 1 hits the chest of the athlete 2 with the sword 3A, the sword 3A and the metal jacket 4B come into contact with each other with the impact, and the judging device 10
A senses both striking and frequency BkHz simultaneously.
As a result, it is determined that the hit is an effective hit, and the light emitting diode 42A indicating the effective hit is turned on. Further, when the sword 3A of the player 1 is hit and the sword 3A hits the arm or the like of the player 2, the determiner 10A does not detect the frequency BkHz at the same time as the hit, so it is determined that the hit is an invalid hit. , The light emitting diode 42B indicating the invalid hit is turned on. Further, when the sword 3A of the player 1 hits the metal fix 5 or when the sword 3A of the player 1 hits the guard of the sword 3B of the player 2, the judging device 10A outputs the frequency EkHz or the frequency DkHz along with the hit. It detects it, ignores the impact, and does not perform any notification operation. In the above, when the own sword 3A is in contact with the own metal jacket 4A, the determiner 10A cannot correctly detect, so if an effective hit or an invalid hit is detected in this state, the display is made. At the same time as the display, the light emitting diode 42C is turned on, thereby indicating that the determination is invalid.

According to this embodiment as described above, the following effects can be obtained. In other words, since the frequency detection method is used, even if the opponent's metal sword 3A and the sword 3A of the opponent are not connected to each other with electric wires, the determiner 10A simply contacts the metal sword 3A with the metal jacket 4B. Jacket
The frequency of the AC voltage applied to 4B can be detected,
It is not necessary to connect the swords and competition clothes of both athletes as in the conventional continuity detection type, and the athletes 1 and 2 can be released from the signal line that restricts freedom of movement.

Further, in the frequency detection method, unlike the direct detection of the signal level of the current, voltage, etc., even the weak signal level can be detected. Irrespective of the above, it becomes possible to reliably detect an effective hit, and it is possible to detect even a weak voltage applied to the hit part. For this reason, it becomes possible to adopt a small power source such as a dry battery, and the judging devices 10A and 10B do not require a power line that extends to the outside as an internal power source, and the athlete can move from the power line that restricts freedom of movement. 1, 2 can be opened, and the determiner 10 itself can be made small so that the athletes 1 and 2 do not lose their freedom of movement.

Further, since the signal line and the power line for restricting the freedom of movement are not required and the electric wiring is not extended to the outside of the athletes 1 and 2, the conventional judging device can move by the electric wiring. Unlike being restricted to a straight line, the athletes 1 and 2 can move freely in the stadium, and the freedom of movement of the athletes 1 and 2 can be greatly increased. Moreover, since the battery is used as the power source, there is no fear of electric shock, and the battery can be used in places such as outdoors where a commercial power source cannot be prepared, and the competition place is not limited.

Further, since the alternating voltage of different frequency is applied to different parts and the hitting part can be discriminated by the detected frequency, it is possible to surely judge whether the hitting is effective or not. With frequency detection, the number of wires that can be connected to a metal jacket or sword can be the same as conventional ones, so you can connect the metal jacket or sword that you have been using up to now to the determiner 10, and modify the metal jacket and sword. There is no need to do it or to purchase a new one.

Further, since the matching circuit 32A is provided in the f detectors 32 to 34 to electrically match the connection with the sword 3A, the DC component of the electric signal from the sword 3A is cut by the coupling capacitor 32E. Only the frequency that resonates with the LC resonance circuit 32F will be selectively input to the active band filter circuit 32B, and the frequency to be detected can be detected even if an electromagnetic pickup or the like is not attached to the swords 3A and 3B. Can be reliably detected.

FIG. 5 shows a second embodiment of the present invention. In this embodiment, the effective hit determining devices 10A, 10B for the flue wearing the metal jacket in the first embodiment are used.
Is an effective hit determination device 10C, 10D for epe, in which the entire body of the athlete is the hit part without wearing a metal jacket. That is, the effective hit determination devices 10C and 10D are the first
The voltage generator 20 and the detector 3 provided in the embodiment
The ultrasonic transmission / reception unit 60 is added to the basic configuration including the voltage generation unit 20A, which is obtained by modifying each of the 0 and the determination unit 40 for epee, the detection unit 30A, and the determination unit 40A.

The voltage generator 20A is the same as the voltage generator 20 of the first embodiment except that an oscillator other than the oscillator 23 for applying an AC voltage of frequency CkHz to the sword 3A is omitted.
The detection unit 30A includes an f detection unit 32 that detects the frequency of the AC voltage applied to the counterpart metal jacket and a DC detection unit 35 that detects the DC voltage applied to the metal jacket from the detection unit 30 of the first embodiment. Is omitted, and the switch element 31A is connected between the impact detection unit 31 and the determination unit 40A. The determination unit 40A replaces the logic operation unit 41 of the first embodiment only when the impact signal “A” is input and the ignore signal “C” and the ignore signal “D” are not input. Logical operation unit 41A for determining effective hits
Is provided. From the determination unit 40A, the first
Light emitting diodes 42B and 42C provided in the determination unit 40 of the embodiment
Is omitted.

The ultrasonic wave transmitting / receiving unit 60 includes an ultrasonic wave transmitting unit 61 for transmitting an ultrasonic wave having a predetermined frequency, an ultrasonic wave receiving unit 62 for detecting only the ultrasonic wave emitted by the judging device of the competition opponent, and an ultrasonic wave transmitting unit. Trigger circuit 63 that sends a trigger signal to activate 61 etc.
And a timer circuit 64 having a timer activated by an output signal of the ultrasonic receiving section 62. Ultrasonic transmitter
61 is an ultrasonic transducer 61A that converts electric signals into ultrasonic waves
And an oscillating section 61B for driving this ultrasonic transducer 61A. Upon receiving the trigger signal from the trigger circuit 63, the ultrasonic transducer 61A emits ultrasonic waves of a predetermined frequency. The ultrasonic wave receiving unit 62 includes an ultrasonic wave detector 62A that converts ultrasonic waves into an electric signal and an ultrasonic wave detector 62A.
A frequency discriminating unit 62B for discriminating the electric signal obtained at A by a discriminating circuit such as a filter.

The trigger circuit 63 is connected to the terminal "F" of the judging section 40A.
When the effective hitting signal output from the device is received, a trigger signal is output to the oscillator 61B of the ultrasonic wave transmitter 61. As a result, the ultrasonic wave transmitting / receiving unit 61 transmits its own effective hit signal to the judging device of the opponent player by ultrasonic waves.
The trigger signal is also output to the switch element 31A of the detection unit 30A via the timer circuit 64. The timer circuit 64 passes the trigger signal of the trigger circuit 63 to the switch element 31A before a predetermined time (for example, 0.04 to 0.05 seconds) elapses after the electric signal from the ultrasonic receiving unit 62 is input. After that, it will shut off after that. When this trigger signal is input to the switch element 31A, the switch element 31A is opened and the impact signal "a" of the impact detection unit 31 is released.
It is designed to shut off.

Here, the judging device 10C side is an ultrasonic wave transmitting / receiving unit.
The 60 transmit and receive frequencies are set to FkHz and GkHz, respectively. On the other hand, on the side of the judging device 10D, the transmission frequency and the reception frequency of the ultrasonic wave transmitting / receiving unit 60 are set to GkHz and FkHz, respectively. This allows
The frequency discriminating unit 62A is adapted to detect only the effective hit signal transmitted by the judging device of the opponent. With such an ultrasonic wave transmitting / receiving unit 60, the decision devices 10C and 10D determine that a valid hit is given only when a valid hit is given to the opponent after a predetermined time has elapsed after the opponent has made an effective hit. Judgment display,
After that, it is not possible to judge the effective hit.
Also, since the effective hit to the opponent is performed by ultrasonic waves with a short transmission distance, even if a plurality of pairs of athletes compete in the same venue, there is no interference. The transmission frequency and the reception frequency of the ultrasonic wave transmitter / receiver 60 can be set to values such as F = 40 kHz and G = 25 kHz.

In this embodiment as well, the same operation and effect as those of the first embodiment can be obtained, and in addition, the effect that the effective hit can be determined without wearing the metal jacket is added. it can.

Although the present invention has been described with reference to the preferred embodiments, the present invention is not limited to these embodiments, and various improvements and design changes may be made without departing from the spirit of the present invention. It is possible. For example, the notification unit is not limited to the one integrated with the determination unit, and may be a separate unit. In this case, a wireless transmission circuit is provided in the determination unit, and signals such as effective hits and invalid hits are transmitted to the notification unit wirelessly. It may be transmitted by ultrasonic waves.

Furthermore, the present invention is not limited to fencing,
In addition to being applicable to other striking type martial arts, it may be modified not only for adults but also for striking type martial arts as a game for infants, elementary school students, etc. If you make the striking part react to a weak striking force,
The material of the hitting part and the hitting tool can be softened, and safety can be improved.

[0033]

As described above, according to the present invention, an electric wire which deprives the athlete of freedom of movement can be eliminated, and the degree of freedom of exercise of the athlete can be greatly increased.

[Brief description of drawings]

FIG. 1 is a schematic view showing an entire first embodiment of the present invention.

FIG. 2 is a block diagram showing an electric circuit of the entire judging device of the present embodiment.

FIG. 3 is a block diagram showing a detection unit of the determination device of the present embodiment.

FIG. 4 is a block diagram showing a logical operation unit of the judging device of the present embodiment.

FIG. 5 is a diagram corresponding to FIG. 2 showing a second embodiment of the present invention.

[Explanation of symbols]

3A, 3B Fencing sword as a striking tool 4A, 4B Metal jacket as a competition outfit 6,23 Oscillator as a voltage generator for applying AC voltage other than the hit area 7 Switch mechanism as a converter 10A, 10B, 10C , 10D Effective hit determination device 21 Oscillator as voltage generator for applying AC voltage to hit area 31 Impact detection section 32 Frequency detection section for detecting frequency of hit area f
Detecting unit 33, 34 f detecting unit 40, 40A which is a frequency detecting unit for detecting frequencies other than the hit part, and a judging unit which is an effective hit judging unit

Claims (4)

(57) [Claims] 1. Wearing a striking tool having a striking part provided with a converter for converting a mechanical shock into an electric signal, and a sportswear having an electrically conductive striking part to which a predetermined voltage is applied. When a plurality of competitors play a competition, an effective batting determination device for batting martial arts is used to judge that one player hits the hit part of the competition wear of another player with his or her own batting tool. A voltage generator that generates an AC voltage of a predetermined frequency to be applied to the attire, an impact detector that receives an electrical signal from the impact tool and detects impact, and the impact tool electrically. Based on the signals of both the frequency detection unit and the frequency detection unit that detects that the impacting unit and the impacted unit are in contact with each other by detecting the predetermined frequency of the AC voltage. Impact detection An effective striking device for striking-type martial arts, comprising: an effective striking determination unit that determines that the striking detected by the club is a striking portion of another player. 2. The effective hit determination device for hitting martial arts according to claim 1, wherein the hitting tool and the frequency detecting section are electrically coupled via a coupling capacitor. An effective hit determination device for type martial arts. 3. The effective hit determination device for hitting martial arts according to claim 1 or 2, wherein AC voltages of different frequencies are applied to the hit parts of the plurality of athletes, respectively. The effective hit determination device for hitting martial arts, characterized in that the frequency detection part of (1) detects a frequency other than the frequency of the AC voltage applied to the hit part. 4. When a plurality of athletes wearing a striking tool having a striking part provided with a converter for converting a mechanical shock into an electric signal, one athlete uses his or her own striking tool to play the competition. Is an effective batting determination device for striking type martial arts, which determines that a player has hit a predetermined location of the athlete, and a voltage generation that generates an alternating voltage of a predetermined frequency to be applied to a location other than the predetermined location of each athlete. Section, an impact detection section that receives an electrical signal of the impact tool and detects impact,
A frequency detector that is electrically coupled to the impact tool and detects that the impact part has contacted with a partner other than the predetermined part by detecting a predetermined frequency of the AC voltage, and an impact detector and a frequency detector An effective hit determination unit for hitting type fighting sports, comprising: an effective hit determination unit that determines whether the hit detected by the impact detection unit is an effective hit based on a signal from the unit.