JP6979578B1 - Effective collision judgment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a visualization method capable of visually judging an effective thrust at the time of practicing fencing, especially an epee event, enabling simultaneous thrust determination without an electric referee, and then transmitting information on the thrust. Even if the signal measurement time varies, it has a mechanism to satisfy the condition within 0.04 seconds, which is the rule of simultaneous thrust, and when noise occurs in the radio signal that conveys the thrust information. Provided is an effective collision determination device having a mechanism for preventing false detection due to noise. SOLUTION: In an effective collision determination device, a light emitting unit installed along a length direction on a blade of a sword and a thrust detection unit that detects the opening and closing of an electric contact at the tip of the sword and detects a thrust by the sword. Then, the light emitting unit emits light according to the signal from the thrust detection unit. [Selection diagram] Fig. 1

Description

The present invention relates to an effective collision determination device.

In fencing games, the movement is fast and complicated, so the appearance of "thrust" is often difficult to see, which is a problem for spectators, referees, and players, and is a major obstacle to the spread of fencing. ing. Even in fencing, Epe is the whole body, and there are parts such as masks, arms, legs, etc. that are smaller and uneven compared to other events, so if the poking position or angle shifts even a little, it will be in the Epe competition. It is considered that the pressure of 750 g on the tip of the sword required for scoring becomes insufficient, and it is likely that the "thrust" itself is not established. If you install an electric referee machine, you can play the competition while checking whether the pressure of the sword tip is effective with the electric referee machine, but since it takes time to install the electric referee machine, electricity is used during normal practice. In many cases, the referee machine is not used. Therefore, it is considered that there are many cases where the practice is performed without being able to confirm that "the tip of the sword is pushed with a pressure of 750 g".

In order to enhance the effectiveness of "thrust", it is considered effective to be able to visualize the effectiveness of "thrust" in the vicinity of the sword. There have been several attempts to visualize swords and "thrusts". Regarding the visualization of the sword, there is an attempt to make it shine along the blade of the sword in Japanese Patent Publication No. 2019-522551 (Patent Document 1), but it does not shine at the time of poking. Utility model registration No. 3151105 (Patent Document 2) discloses a sword having a light emitting function, and emits light by changing the angle of the stylus when the stylus is projected from the tip and the tip of the sword comes into contact with the stylus. , This is different from the sword of the normal Epe competition in the mechanism of the sword tip, and it cannot be used for the practice of the Epe competition. There is also an attempt to visualize the trajectory of the sword and the moment when the sword hits by making full use of video technology (Non-Patent Document 1), but it requires extensive preparation and cannot be used for normal practice.

In addition, Epe has a unique rule that if both "thrusts" are effective within a certain period of time (40 milliseconds), "simultaneous thrusts" are allowed, and "simultaneous thrusts" are normal epees. Frequently used in the game, it is one of the important tactics. Normally, an electric referee machine is used to make a "simultaneous thrust" judgment, but for daily Epe practice, it is desirable to be able to make a "simultaneous thrust" judgment without using an electric referee machine. As a method for determining "simultaneous thrust" without using an electric referee, Japanese Patent Application Laid-Open No. 7-51424 (Patent Document 3) discloses a method for exchanging signals between swords using ultrasonic waves. There is. In this method, after receiving the ultrasonic wave transmitted at the time of the effective thrust of the other sword and discriminating the frequency, the timer invalidates the thrust of the own sword 0.04 seconds later. In order to satisfy the condition of simultaneous collision, it is necessary to keep it within 0.04 seconds including the time required for ultrasonic exchange, but since the time required for ultrasonic detection and frequency discrimination is not taken into consideration, it is super. The time from receiving the sound wave to disabling the sword thrust may exceed 0.04 seconds. Further, there is a possibility of erroneous detection when ultrasonic noise is generated, but the method of preventing erroneous detection is not considered.

Special Table 2019-522551 Gazette Utility Model Registration No. 3151105 Gazette Japanese Unexamined Patent Publication No. 7-51424

"Visualizing fencing movements with AI, watching high-tech games using VR and 4K" | Nikkei xTECH (cross-tech) (https://tech.nikkeibp.co.jp/atcl/nxt/column/18/00129/021600013/ )

Thus, in the conventional method, there is no report of a fencing épée sword for practice that can visually judge an effective thrust by shining the tip of the sword when it is struck, and the judgment of simultaneous thrust is electric. Although methods have been reported to enable it without a referee, it may not meet the simultaneous thrust rule of 0.04 seconds or less. Moreover, the mechanism for preventing false detection due to noise is not considered.

An object of the present invention is to provide a visualization method capable of visually determining an effective thrust when practicing fencing, especially an Epe event, enabling simultaneous thrust determination without an electric referee, and then thrust information. Even if the measurement time of the radio signal that conveys the thrust varies, it has a mechanism to satisfy the condition within 0.04 seconds, which is the rule of simultaneous thrust, and noise is generated in the radio signal that conveys the thrust information. In this case, it is an object of the present invention to provide an effective collision determination device having a mechanism for preventing false detection due to noise.

The invention of the effective collision determination device according to claim 1 is installed along a thrust detection unit that detects the opening / closing of an electric contact at the tip of a sword and detects a thrust by the sword, and a length direction on the blade of the sword. A light emitting unit that emits light according to a signal from the thrust detection unit, an audible sound sounding unit that is installed inside the collar and emits an audible sound according to the signal from the thrust detection unit, and a wireless unit that emits an audible sound according to the signal from the thrust detection unit. When the peak wavelength of the Fourier-transformed Fourier waveform of the radio signal transmitting unit, the radio signal receiving unit, and the signal received by the radio signal receiving unit is within a predetermined range, the start of time measurement is instructed. The radio signal determination unit, the timer for starting the time measurement according to the instruction from the radio signal determination unit, and the total time required for execution of the radio signal reception unit and the radio signal determination unit are subtracted and set. It is characterized in that it is composed of a light emitting control unit that stops power supply to the light emitting unit according to a signal from the timer after a set time.

The invention of the effective collision determination device according to claim 2 is further characterized in that, in the invention of claim 1 , a sound wave signal is used as the radio signal.

The invention of the effective collision determination device according to claim 3 is further characterized in that an electromagnetic wave signal is used as the radio signal in the invention according to claim 1.

The invention of the effective collision determination device according to claim 4 is further described in the invention of claim 2, wherein the radio signal receiving unit is sampled by a sampling unit that samples the received sound wave signal and the sampling unit. It consists of a buffer that stores a certain number of audio signals, and the radio signal determination unit performs the Fourier transform based on the audio signal received from the buffer, and generates the Fourier waveform. It is characterized by having a peak frequency detection unit that detects the maximum peak of the waveform and detects the peak frequency of the Fourier waveform whose maximum peak frequency is within the predetermined range.

(A) By detecting the thrust by the sword and emitting light from the light emitting part installed on the blade, the player, the spectator, and the referee can clearly judge whether the thrust is effective or not at the moment of the thrust without looking at the referee machine. It is possible to provide an effective collision determination device that can be used.

(B) According to the signal from the thrust detection unit that detected the thrust by the sword, the audible sound sounding unit installed inside the brim produces an audible sound, and the light emitting unit installed on the blade at the moment of the thrust. It is possible to provide an effective collision determination device that can clearly determine whether or not the thrust is effective at the moment of the thrust even when the position is in the blind spot.

(C) The radio signal receiving unit of the own sword receives the radio signal transmitted from the radio signal transmitting unit according to the signal from the opponent's sword thrust detection unit, and the received radio signal transmits the radio signal of the opponent. The radio signal determination unit determines that the signal is from the unit, the time measurement by the timer is started according to the signal from the radio signal determination unit, and the light emission control unit emits light according to the signal from the timer after the set time. By controlling the light emission of the above, it is possible to provide an effective collision determination device capable of simultaneous collision determination of a more accurate determination time.

(D) By using a sound wave signal as a radio signal, it is possible to provide an effective collision determination device capable of determining whether or not an effective collision is possible and at the same time determining simultaneous collision.

(E) By using an electromagnetic wave signal as a wireless signal, it is possible to provide an effective collision determination device capable of more accurate determination of a signal even when it is difficult to determine a sound wave signal due to noise.

(F) By measuring the total time required for execution of the wireless signal receiving unit and the wireless signal determination unit and setting the timer setting time based on the measured time, simultaneous collision determination is possible more accurately. It is possible to provide an effective collision determination device.

(G) The radio signal receiving unit consists of a sampling unit that receives and samples a sound wave signal and a buffer that stores a certain number of audio signals sampled by the sampling unit, and the radio signal determination unit receives audio received from the buffer. It consists of a Fourier transform unit that performs Fourier transform based on a signal and generates a Fourier waveform, and a peak frequency detector that detects the maximum peak of the Fourier waveform and detects the Fourier waveform whose maximum peak frequency is within a predetermined range. By outputting the information of the Fourier waveform from the peak frequency detection unit, the radio signal determination unit suppresses erroneous detection due to noise, and is an effective collision determination device that can more accurately detect the signal from the opponent's radio signal transmission unit. Can be provided.

It is a block diagram which shows the whole structure of the effective collision determination apparatus which concerns on 1st Embodiment. It is a schematic diagram which shows the operation at the time of the fencing Epe event of the effective collision determination device which concerns on 1st Embodiment. It is a block diagram which shows the internal structure of the light emitting / sounding part of the effective collision determination device which concerns on 1st Embodiment. It is a block diagram which shows the internal structure of the control part of the effective collision determination apparatus which concerns on 1st Embodiment. It is a flowchart which shows an example of the process flow of the control part of the effective collision determination apparatus which concerns on 1st Embodiment. It is a Fourier spectrum of the electronic buzzer used for the audible sound sounding part of the effective collision determination apparatus which concerns on 1st Embodiment. It is a figure which shows the buffer size dependence of the histogram of the sound wave information acquisition time which concerns on 1st Embodiment. It is a figure which shows the buffer size dependence of the cumulative ratio histogram of the sound wave information acquisition time which concerns on 1st Embodiment. It is a figure which shows the buffer size dependence of the measurement time for every cumulative ratio of the sound wave information acquisition time which concerns on 1st Embodiment. It is a figure which shows the buffer size dependence of the Fourier spectrum of the electron buzzer used for the audible sound sounding part which concerns on 1st Embodiment. It is a figure which shows the state of storing the effective collision determination apparatus inside the collar which concerns on 1st Embodiment. It is a block diagram which shows the internal structure of the light emitting / sounding part of the effective collision determination device which concerns on 2nd Embodiment. It is a block diagram which shows the internal structure of the control part of the effective collision determination apparatus which concerns on 2nd Embodiment. It is a flowchart which shows an example of the processing flow of the control part of the effective collision determination apparatus which concerns on 2nd Embodiment.

(First Embodiment)
(Configuration of effective collision determination device 1)
Hereinafter, the configuration of the effective collision determination device 1 will be described with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of an effective collision determination device 1.

As shown in FIG. 1A, the effective collision determination device 1 has a device 1A attached to the sword S1 of the fencer F1 and a device 1B attached to the sword S2 of the fencer F2.

As shown in FIG. 1B, the device 1A has a light emitting / sounding unit 7, a control unit 8, and a storage unit 9, and the device 1B has a light emitting / sounding unit 10, a control unit 11, and a storage unit 12. Has. The light emitting / sounding unit 7 has a thrust detecting unit 13, a light emitting unit 14, and an audible sound sounding unit 15, and the light emitting / sounding unit 10 has a thrust detecting unit 16, a light emitting unit 17, and an audible sound sounding unit 18. The control unit 8 and the control unit 11 have a CPU that executes various processes, and control various operations in the device 1A and the device 1B, respectively. The functions of the control unit 8 and the control unit 11 are realized by the CPU reading and executing various programs stored in the storage unit 9 and the storage unit 12, respectively. The storage unit 9 and the storage unit 12 have storage elements such as RAM, ROM, HDD, and SSD. Various programs for controlling the device 1A and the device 1B are stored in the storage unit 9 and the storage unit 12, respectively.

The outline of the operation of the effective collision determination device 1 (including the device 1A and the device 1B) is shown.

In the device 1A, the control unit 8 incorporates a power supply circuit that supplies power to the light emitting unit 14 and the audible sound sounding unit 15 in the light emitting / sounding unit 7, and the thrust detection unit 13 switches the power supply circuit. It has become. That is, when a thrust by the sword S1 possessed by the fencer F1 occurs, the thrust detection unit 13 detects this thrust, and the power feeding circuit is turned on to supply power while the thrust is established, and the light emitting unit 14 emits light. Then, the audible sound sounding unit 15 produces a sound. The operation in the device 1B is the same as the operation in the device 1A.

The audible sound from the audible sound sounding unit 15 is received in the control unit 11 of the device 1B. After 40 milliseconds or more have passed from the reception, the control unit 11 cuts off the power supply to the light emitting / sounding unit 10. As a result, even if the thrust detection unit 16 detects the thrust of the sword S2 of the fencer F2, the light emission of the light emitting unit 17 and the sound of the audible sound sounding unit 18 do not occur. On the other hand, if it is less than 40 milliseconds after reception, when the thrust detection unit 16 detects the thrust by the sword S2 possessed by the fencer F2, power is supplied while the thrust is established, the light emitting unit 17 emits light, and an audible sound is produced. Part 18 pronounces. The audible sound from the audible sound sounding unit 18 is received in the control unit 8 of the device 1A, and thereafter, the same operation as described above is performed.

The above operation will be described with reference to FIG. In FIG. 2A, the fencer F1 stabs the shoulder of the fencer F2 with the sword S1, the light emitting unit 25 on the sword S1 emits light, and the audible sound sounding unit 27 emits sound, while at the same time, the fencer F2 decides to thrust the toes of Fencer F1 with the sword S2, the light emitting unit 26 on the sword S2 emits light, and the audible sound sounding unit 28 emits sound, and simultaneous thrusting is established. This is the case when the distance between the two thrusts is less than 40 milliseconds. FIG. 2B shows a case where the time from the poke by the fencer F1 to the poke by the fencer F2 is 40 milliseconds or more. In this case, only the light emitting unit 25 emits light and the light emitting unit 26 emits light. No. Further, only the audible sound sounding unit 27 pronounces, and the audible sound sounding unit 28 does not pronounce. The same operation is performed when the fencer F2 is struck first. In this way, it is possible to make a judgment based on the light emission and pronunciation of "simultaneous thrust" without an electric referee and in the vicinity of the sword.

FIG. 3 is a configuration diagram of the inside of the light emitting / sounding unit 31 (including the light emitting / sounding unit 7 and 10).

As shown in FIG. 3, the thrust detection unit 32 and the light emitting unit 33, which are the components of the light emitting / sounding unit 31, are installed along the tip of the blade 34 and the blade 34, respectively, and the audible sound sounding unit 35 controls. It is installed inside the collar 38 like the unit 36 and the storage unit 37. A circuit is configured in which a voltage is applied in parallel from the power supply inside the control unit 36 to the light emitting unit 33 and the audible sound sounding unit 35 via the thrust detection unit 32. The thrust detection unit 32 is assumed here to be a sword tip for an epee competition, and is provided with a button that makes the sword tip conductive when pressed with a pressure of 750 g. A tape-shaped LED that emits visible light having a length of several tens of centimeters can be installed on the light emitting unit 33 at the tip of the sword. An electronic buzzer having a sounding frequency of about several kHz can be used for the audible sound sounding unit 35. When the thrust detection unit 32 detects a thrust, a voltage is applied in parallel to the light emitting unit 33 and the audible sound sounding unit 35, the light emitting unit 33 emits light, and the audible sound sounding unit 35 produces a sound. The voltage used here may be 5V or 12V. In the devices 1A and 1B of FIG. 1B, in order to identify the audible sounds for simultaneous collision determination, the sounding frequencies of the audible sound sounding units 35 differ from each other by several tens of kHz or more between the two devices. Is desirable.

FIG. 4 is a configuration diagram of the inside of the control unit 36.

As shown in FIG. 4, the control unit 36 includes a sound wave signal receiving unit 44, a sound wave signal determination unit 45, a timer 46, a light emission control unit 47, and a power supply 48. The sound wave signal receiving unit 44 has a sampling unit 441 and a buffer 442. The sound wave signal determination unit 45 includes a Fourier transform unit 451 and a peak frequency detection unit 452.

When the other device produces an audible sound by thrusting, the audible sound is received by the sound wave signal receiving unit 44 in the control unit 36, the sound wave signal is sampled by the sampling unit 441, and then a certain number of sound waves are stored in the buffer 442. The signal is buffered.

A fast Fourier transform is performed on the buffered sound wave signal by the Fourier transform unit 451 in the sound wave signal determination unit 45. The peak frequency detection unit 452 acquires a frequency that gives the maximum amplitude from the result of the Fourier transform, and determines whether or not this is within a predetermined range. The predetermined range is, for example, a range substantially the same as or close to the sound frequency of the audible sound sounding unit 35 of the other device. If it is determined to be within the predetermined range, the time measurement of the timer 46 is started, and after a certain period of time, information is sent to the power supply 48, and the voltage supply circuit to the light emitting / sounding unit 31 is cut off. As a result, the other sword will not emit light or pronounce even if it is thrust. The timer time setting is adjusted so that the time from the start of sampling of the sound wave signal is 40 milliseconds. The details will be described in the next section.

As described above, for less than 40 milliseconds from the "thrust" of one sword, the "thrust" of the other sword also emits light and sounds, but after 40 milliseconds or more, the other sword is stabbed. However, light emission and pronunciation do not occur. By transmitting sound information between swords in this way, it is possible to determine "simultaneous thrust" without an electric referee and while looking at the tip of the sword.

FIG. 5 is a flowchart showing an example of the processing flow of the light emitting / sounding unit 31.

The flowchart will be described with reference to FIGS. 4 and 5.

After the step of the sound wave signal receiving 51 is executed in the sound wave signal receiving unit 44, the time t1 at that time is acquired (52) and stored in the storage unit 37. After that, in the sampling unit 441 in the sound wave signal receiving unit 44, after the sampling step 53 is executed, the buffering step 54 is executed and the data is stored in the buffer 442. For the data in the buffer 442, the Fourier transform unit 451 in the sound wave signal determination unit 45 executes the Fourier transform step 55, and the fast Fourier transform obtains an array of the amplitude and frequency of the Fourier transform.

The amplitude and frequency array of the Fourier transform is input to the peak frequency detection step 56 in the peak frequency detection unit 452. First, in step 561, the maximum value Pm of the Fourier spectrum and the frequency Fm giving Pm are acquired. FIG. 6 shows a Fourier spectrum acquired by using an electronic buzzer as an audible sound sounding unit. In this buzzer, it can be seen that a single sharp peak appears at about 3445 Hz. When this buzzer is used, if it is known that the frequency Fm is about 3445 Hz, it can be determined that the sound of this buzzer has been detected.

Next, in step 562, the condition determination of (Fm> F1) and (Fm <F2) and (Pm ≧ Pt) is performed. F1, F2, and Pt are preset constants, and in the case of an electronic buzzer having a peak of 3445 Hz, for example, F1 = 3440 Hz and F2 = 3450 Hz are set. Pt is set based on the numerical value of the amplitude when the electronic buzzer is separated by about 1 m in advance.
If the condition of step 562 is not satisfied, the process returns to the acquisition (52) of time t1. If it is satisfied, the process proceeds to acquisition 563 at time t2, and the measurement time tm = t2-t1 is calculated.

Next, the timer 46 and the light emission control unit 47 perform processing for simultaneous collision determination.

First, the waiting time tw = ts-tm is acquired. Here, ts is the simultaneous determination time (= 40 milliseconds). If the obtained tw is a positive number, the wait process for tw seconds is performed. If tw becomes a negative number, the simultaneous determination time of 40 milliseconds will be exceeded, so the wait process is not performed. After that, power supply stop 573 to the light emitting / sounding unit is carried out.

It is thought that the actual value of tm will greatly affect the processing here, so in the following, we implemented using Raspberry Pi Zero as the CPU and examined the optimization of the buffer size for tm. .. The OS was LINUX Rasverian, and the programming language Python 3.7 was used, and the Pyaudio library was used for processing sound information.

It is considered that the measurement time tm of the sound wave signal is given by the sum of the buffer reading time ct and the Fourier transform time tf. If the sampling rate is RATE and the buffer size is CHUNK, then tk = CHUMK / RATE, and if the normally used RATE (= 44100) and CHUNK (= 1024) are used, then tc = 23 ms. Since ct is proportional to the buffer size CHUNK, it is possible to shorten the reading time by reducing the buffer size.

However, if the buffer size is reduced, the number of data used for the fast Fourier transform is reduced, so that the frequency resolution and S / N ratio of the obtained spectrum are reduced, and it is considered that the buzzer sound determination accuracy is deteriorated. Therefore, the buffer size was optimized from the two viewpoints of measurement time and spectrum measurement.

First, the distribution of tk was measured. FIG. 7 is a diagram showing a histogram of tk when 1000 sound measurements are repeated, with buffer sizes changed to 1024, 512, 256, 128, and 64. From FIG. 7, it can be seen that the average value of tc is about several milliseconds to 20 milliseconds, which is orderly equal to the theoretical value, but there is systematic variation and the magnitude of the variation is also considerably large.

Therefore, in order to statistically handle the variation in the sound measurement time, as shown in FIG. 8, a cumulative ratio histogram in which the histogram in which tc was accumulated was expressed as a ratio was obtained, and the buffer size dependence was investigated. In the graph of FIG. 8, assuming that the sound acquisition time on the horizontal axis is tun when the cumulative ratio on the vertical axis is Rn (%), the number of measurements within the sound acquisition time tun occupies the total number of measurements. It means that the ratio is Rn. In order to express the information of these graphs in one graph in an easy-to-understand manner, Rn is changed to 80%, 85%, 90%, 95%, and 100% for each buffer size, and tun is read from FIG. rice field. FIG. 9 shows a line graph of the read information drawn for each Rn with the buffer size on the horizontal axis and tun on the vertical axis. The graph of each Rn means that the number of measurements in which the sound acquisition time at a certain buffer size is within the value on the vertical axis of the graph is Rn% with respect to the total number of measurements.

From FIG. 9, when the buffer size is 64, the measurement time is minimized at any ratio. Therefore, if there is no problem in the waveform of the spectrum, the buffer size 64 is optimal. If the buffer size 64 has a waveform problem, consider the buffer sizes 128, 256, 512, but when viewed at a ratio of 80%, only the buffer size 128 is 15 milliseconds, which is significantly smaller than the other sizes. There is. From the above, it is considered that the buffer size 128 is the most suitable among the buffer sizes 128, 256, and 512. Considering the buffer size as a value of continuous integers instead of discrete integers, from FIG. 9, when R0 is 100%, the value of the buffer size in which the measurement time is 40 milliseconds is about 400. Therefore, it can be said that the buffer size condition for setting the simultaneous collision determination time to 40 milliseconds is about 400 or less.

FIG. 10 shows the Fourier spectrum of the electron buzzer sound for each buffer size. It can be seen that the shape of the Fourier spectrum becomes sharper as the buffer size increases, and the peak width gradually increases as the buffer size decreases. To detect the maximum peak value, it is necessary that the peak is sharp and the noise is small, but from buffer sizes 1024 to 128, the peak is sharp enough and it is possible to detect the peak with good reproduction without false detection. rice field. On the other hand, with the buffer size 64, the expansion of the peak width was large and the S / N was small, and erroneous detection was occasionally observed. Therefore, it was judged that the buffer size should be 128 or more. From this and the above-mentioned conclusion "Of the buffer sizes 128, 256, 512, the buffer size 128 is the most suitable", it was concluded that the total optimum buffer size is 128. As a condition for the buffer size for setting the judgment time of simultaneous collision to 40 milliseconds, the shape of the peak is sharp up to the buffer size of about 100 when the S / N of the Fourier spectrum of the electronic buzzer sound is also taken into consideration. As a result, it can be said that the buffer size = about 100 to about 400. Further, as shown in FIG. 9, in the buffer size 128, the measurement time is within 33 milliseconds at 100% measurement. Therefore, by setting the buffer size to 128, tw is rarely a negative number, and it is considered that the simultaneous collision determination time can be accurately set to 40 milliseconds in almost all measurements.

FIG. 11 shows the components of the prototype system (Raspberry Pi Zero 63 constituting the control unit 36 and the storage unit 37, the USB microphone 65 constituting the sound wave signal receiving unit 43, and the electronic buzzer 64 constituting the audible sound sounding unit 35). The state where it was stored inside the collar 38 is shown. The rechargeable battery 66 is provided on the outside of the collar 38 and supplies power to the raspberry pi zero 63 via a cord. The size and weight of the Raspberry Pi Zero 63 is 79 mm × 38 mm × 12 mm, 25 g. In this way, except for the rechargeable battery 66, it can be easily stored inside the collar 38. When the prototype device is held in the hand, the index finger can be placed in the deepest position, and the finger holding the grip 62 does not come into contact with the installation object in the collar 38, and the sword can be handled as usual. The weight is about 30 g excluding the rechargeable battery 66, which is sufficiently lighter than the weight of the sword for Epe (maximum 770 g). The rechargeable battery 66 may be mounted around the waist by passing the cord through the sleeve, or may be mounted in the collar 38 if it is sufficiently light.

(Second embodiment)
(Configuration of effective collision determination device 2)
Hereinafter, the configuration of the effective collision determination device 2 will be described with reference to the drawings.

The basic configuration of the effective collision determination device 2 is the same as that shown in FIG. 1, and the difference from the effective collision determination device 1 is mainly the method of wireless communication between the devices. In the description of the present embodiment, the description of the same configuration as the effective collision determination device 1 will be omitted.

FIG. 12 is a configuration diagram showing the internal configuration of the light emitting / sounding unit 71 of the effective collision determination device 2.

The basic configuration of the effective collision determination device 2 is the same as the internal configuration of the light emitting / sounding unit of the effective collision determination device 1. As shown in FIG. 12, the thrust detection unit 72 and the light emitting unit 73, which are the components of the light emitting / sounding unit 71, are installed along the tip of the blade 74 and the blade 74, respectively, and the audible sound sounding unit 75 controls. It is installed inside the collar 38 like the unit 76 and the storage unit 77.

Unlike the effective collision determination device 1, a circuit is configured in which a voltage is applied in parallel from the power supply inside the control unit 76 to the light emitting unit 73 and the audible sound sounding unit 75 without going through the detection unit 72. The thrust detection unit 72 is connected to the control unit 76. When the thrust detection unit 72 detects a thrust, the information is transmitted to the control unit 76, a voltage is applied from the control unit 76 to the light emitting unit 73 and the audible sound sounding unit 75, the light emitting unit 73 emits light, and the audible sound sounding unit. 75 is pronounced.

FIG. 13 is a configuration diagram of the inside of the control unit 76 of the effective collision determination device 2. The difference from the effective collision determination device 1 is that wireless communication between the devices is performed using electromagnetic waves.

As shown in FIG. 13, the control unit 76 includes a thrust information receiving unit 82, an electromagnetic wave signal transmitting unit 83, a light emitting control unit (1) 84, a power supply 85, an electromagnetic wave signal receiving unit 86, an electromagnetic wave signal determination unit 87, and a timer 88. It has a light emission control unit (2) 89.

When the thrust by the light emitting / sounding unit 71 is determined, the information from the thrust detection unit 72 is received by the thrust information receiving unit 82, the information is sent to the electromagnetic wave signal transmitting unit 83, and the electromagnetic wave signal is directed to the other sword. Is sent. At the same time, the information from the thrust information receiving unit 82 is transmitted to the light emitting control unit (1) 84, and the voltage to the light emitting unit 73 and the audible sound sounding unit 75 in the light emitting / sounding unit 71 is supplied through the power supply 85. , The light emitting unit 73 in the light emitting / sounding unit 71 emits light, and the audible sound sounding unit 75 produces a sound.

The electromagnetic wave signal transmitted by the thrust generated by the other device is received by the electromagnetic wave signal receiving unit 86 and passed to the electromagnetic wave signal determination unit 87. When the electromagnetic wave signal determination unit 87 determines that the electromagnetic wave signal is from the other device based on the frequency of the electromagnetic wave, the time measurement of the timer 88 is started, and after a certain period of time, the light emission control unit (2) 89 starts. Information is sent to the power supply 85, and the supply of voltage to the light emitting / sounding unit 71 is stopped. As a result, the sword of this device does not emit light and sound even if it is thrust. The timer time setting is adjusted so that the time from the reception of the electromagnetic wave signal is 40 milliseconds.

FIG. 14 is a flowchart showing an example of the processing flow of the light emitting / sounding unit 71. FIG. 14A is a flowchart showing the flow of processing from receiving the sound wave signal, and FIG. 14B is a flowchart showing the flow of processing from receiving the thrust information.

First, a flowchart will be described with reference to FIG. 14 (A).
When the electromagnetic wave signal accompanying the thrust of the other device is received in the electromagnetic wave signal reception step 91, the time t1 at that time is acquired (92) and stored in the storage unit 77. After that, in the electromagnetic wave signal determination step, it is determined that the received electromagnetic wave is an electromagnetic wave signal associated with the thrust of the other device.

First, in step 931 the frequency Fm of the electromagnetic wave signal is acquired, and in step 932, the condition of (Fm> F1) and (Fm <F2) is determined. F1 and F2 are constants, and if the frequency of the electromagnetic wave signal emitted by the device for the other peak is F0, for example, F1 = F0-dF and F2 = F0 + dF (dF is a constant) are set. If the condition of step 932 is not satisfied, the process returns to the acquisition of time t1 (92). If it is satisfied, the process proceeds to the acquisition of time t2 (933), and the measurement time tm = t2-t1 is calculated (934).

Subsequent processing is the same as in the case of the effective collision determination device 1. Performs processing for simultaneous collision determination. First, the waiting time tw = ts-tm is acquired (941). Here, ts is the simultaneous determination time (= 40 milliseconds). If the obtained tw is a positive number, the wait process (942) for tw seconds is performed. If tw becomes a negative number, the simultaneous determination time of 40 milliseconds will be exceeded, so the wait process is not performed. After that, the power supply to the light emitting / sounding unit is stopped 943.

Next, a flowchart will be described with reference to FIG. 14 (B).

When the information from the thrust detection unit 72 of the light emitting / sounding unit 71 is received in the thrust information receiving step 95 of the thrust information receiving unit 82, two processes are performed at the same time. The light emission control unit (1) 84 executes the light emission control step 1 97, and power supply to the light emission / sounding unit 71 is started. Further, the electromagnetic wave signal transmission unit 83 executes the electromagnetic wave signal transmission step 96, and the electromagnetic wave signal is transmitted to the other device.

As described above, the effective collision determination device 2 uses an electromagnetic wave signal as a radio signal in the fencing épée sword, so that even if there is noise and it is difficult to determine the sound wave signal, the signal can be determined more accurately. Is possible.

That is, the effective collision determination devices 1 and 2 of the embodiment are the light emitting portions 33 and 73 installed on the blades 34 and 74 of the swords S1 and S2 along the length direction, and the electric contacts at the tips of the swords S1 and S2. It is composed of thrust detection units 32 and 72 that detect the opening and closing of the sword and detect the thrust by the swords S1 and S2, and the light emitting units 33 and 73 emit light according to the signals from the thrust detection units 32 and 72.

Further, the effective collision determination devices 1 and 2 of the embodiment have audible sound sounding units 35 and 75 inside the collar 38, and the audible sound sounding unit emits audible sound according to signals from the thrust detecting units 32 and 72. Pronounce.

Further, the effective collision determination devices 1 and 2 of the embodiment include the radio signal transmitting units 35 and 83 that transmit radio signals according to the signals from the collision detecting units 32 and 72, the radio signal receiving units 44 and 86, and the radio. The time is measured according to the radio signal determination units 45 and 87 that determine that the signal received by the signal reception units 44 and 86 is the signal from the opponent's radio signal transmission unit and the signal from the radio signal determination unit. It is composed of timers 46 and 88 to be started, and light emission control units 47 and 89 that control the light emission of the light emitting units 33 and 73 according to the signals from the timers 46 and 88 after the set time.

Further, the effective collision determination device 1 of the embodiment uses a sound wave signal as the radio signal.

Further, the effective collision determination device 2 of the embodiment uses an electromagnetic wave signal as the radio signal.

Further, the effective collision determination devices 1 and 2 of the embodiment measure the total time required for execution of the radio signal receiving units 44 and 86 and the radio signal determination units 45 and 87, and based on the time, the said The set time of the timers 46 and 88 is set.

Further, in the effective collision determination device 1 of the embodiment, the radio signal receiving unit 44 stores a sampling unit 441 that samples the received sound wave signal and a certain number of audio signals sampled by the sampling unit. The radio signal determination unit 45, which is composed of 442, performs a Fourier conversion based on the voice signal received from the buffer, detects a Fourier conversion unit 451 that generates a Fourier waveform, and detects the maximum peak of the Fourier waveform. It includes a peak frequency detection unit 452 that detects a Fourier waveform whose maximum peak frequency is within a predetermined range, and the radio signal determination unit 45 outputs information on the Fourier waveform from the peak frequency detection unit 452.

According to the embodiment, the following effects are exhibited.

(A) By detecting the thrust by the swords S1 and S2 and emitting light from the light emitting portions 33 and 73 installed on the blades 34 and 74, the athlete, the spectator, and the referee can effectively thrust without looking at the referee machine. It is possible to provide effective collision determination devices 1 and 2 that can clearly determine whether or not the collision occurs at the moment of collision.

(B) According to the signals from the thrust detection units 32 and 72 that have detected the thrust by the swords S1 and S2, the audible sound sounding units 35 and 75 installed inside the collar 38 emit an audible sound, whereby the blade 34, It is possible to provide effective collision determination devices 1 and 2 that can clearly determine whether or not an effective thrust is effective at the moment of thrust even when the light emitting units 33 and 73 installed on the 74 are in the blind spot position at the moment of thrust. can.

(C) The radio signal transmitted from the radio signal transmitting units 35 and 83 according to the signals from the thrust detection units 32 and 72 of the opponent's swords S1 and S2 is transmitted to the radio signal receiving units 44 and 86 of their own swords S1 and S2. Received, and the radio signal determination units 45 and 87 determine that the received radio signal is a signal from the opponent's radio signal transmission unit, and the timer 46, according to the signal from the radio signal determination units 45 and 87, Time measurement by 88 is started, and the light emission control units 47 and 89 control the light emission of the light emitting unit according to the signal from the timer after the set time, so that the effective collision determination that enables more accurate simultaneous collision determination of the determination time is possible. Devices 1 and 2 can be provided.

(D) By using a sound wave signal as a wireless signal, it is possible to provide an effective collision determination device 1 capable of determining whether or not an effective collision is possible and at the same time determining simultaneous collision.

(E) By using an electromagnetic wave signal as a wireless signal, it is possible to provide an effective collision determination device 2 capable of more accurate determination of a signal even when it is difficult to determine a sound wave signal due to noise.

(F) By measuring the total time required for execution of the wireless signal receiving units 44, 86 and the wireless signal determination units 45, 87, and setting the set time of the timers 46, 88 based on the measured time, the set time is set. It is possible to provide effective collision determination devices 1 and 2 capable of more accurately determining simultaneous collisions.

(G) The radio signal receiving unit 44 includes a sampling unit 441 that receives a sound wave signal and samples it, and a buffer 442 that stores a certain number of audio signals sampled by the sampling unit. The radio signal determination unit 45 comprises a buffer. A Fourier transform unit 451 that performs a Fourier transform based on the voice signal received from 442 to generate a Fourier waveform, and a peak that detects the maximum peak of the Fourier waveform and detects the Fourier waveform whose maximum peak frequency is within a predetermined range. It consists of a frequency detection unit 452, and the radio signal determination unit 45 outputs information on the Fourier waveform from the peak frequency detection unit 452 to suppress erroneous detection due to noise and more accurately from the opponent's radio signal transmission unit. It is possible to provide an effective collision determination device 1 capable of detecting a signal.

Each step of each procedure in the embodiment may be executed at the same time by changing the execution order, or may be executed in a different order for each execution, as long as it does not contradict the nature of the steps. Further, all or a part of each step of each procedure in the present embodiment may be realized by hardware.

The embodiment is not limited to the above-described embodiment, and various changes, modifications, and the like can be made without changing the gist.

The audible sound and the electromagnetic wave in the embodiment are radio signals. The radio signal may include ultrasonic waves.
In the description of the embodiment, an example in which the effective collision determination devices 1 and 2 are applied to the fencing épée competition has been described, but the present invention is not limited to this, and may be applied to, for example, the fencing foil competition, or other than that. It may be applied to a thrust in a competition or the like.

1 Effective collision determination device 1A Device 1B Device 2 Effective collision determination device 7 Light emission / sound wave unit 8 Control unit 9 Storage unit 10 Light emission / sound wave unit 11 Control unit 12 Storage unit 13 Thrust detection unit 14 Light emission unit 15 Hearing sound sound wave unit 16 Thrust Detection unit 17 Light emitting unit 18 Hearing sound sounding unit 25 Light emitting unit 26 Light emitting unit 27 Hearing sound sounding unit 28 Hearing sound sounding unit 31 Light emitting / sounding unit 32 Thrust detection unit 33 Light emitting unit 34 Blade 35 Audio sound sounding unit 36 Control unit 37 Memory Part 38 鍔 44 Sound wave signal receiving part 441 Sampling part 442 Buffer 45 Sound wave signal judgment part 451 Fourier conversion part 452 Peak frequency detection part 46 Timer 47 Light emission control part 48 Power supply 62 Grip 63 Raspberry pie zero 64 Electronic buzzer 65 USB microphone 66 Rechargeable battery 71 Light emission / sound wave unit 72 Thrust detection unit 73 Light emission unit 74 Blade 75 Hearing sound sound wave unit 76 Control unit 77 Storage unit 82 Thrust information receiving unit 83 Electromagnetic wave signal transmission unit 84 Light emission control unit (1)
85 Power supply 86 Electromagnetic wave signal receiver 87 Electromagnetic wave signal determination unit 88 Timer 89 Light emission control unit (2)
F1 Fencer F2 Fencer S1 Sword S2 Sword

Claims (4)

A thrust detection unit that detects the opening and closing of the electrical contact at the tip of the sword and detects the thrust by the sword,
A light emitting unit that is installed along the length direction on the blade of the sword and emits light according to a signal from the thrust detection unit.
An audible sound sounding unit that is installed inside the brim and produces an audible sound according to the signal from the thrust detection unit.
A wireless signal transmitting unit that transmits a wireless signal according to a signal from the thrust detection unit,
Wireless signal receiver and
When the peak wavelength of the Fourier transform of the signal received by the radio signal receiving unit after the Fourier transform is within a predetermined range, the radio signal determination unit instructing the start of time measurement and the radio signal determination unit
A timer that starts the time measurement according to an instruction from the radio signal determination unit, and
A light emitting control unit that stops power supply to the light emitting unit according to a signal from the timer after a set time set by subtracting the total time required for execution of the wireless signal receiving unit and the wireless signal determination unit. ,
An effective collision determination device characterized by being composed of. In the effective collision determination device according to claim 1,
An effective collision determination device characterized in that a sound wave signal is used as the radio signal. In the effective collision determination device according to claim 1,
An effective collision determination device characterized in that an electromagnetic wave signal is used as the radio signal. In the effective collision determination device according to claim 2,
A sampling unit in which the radio signal receiving unit samples the received sound wave signal, and a sampling unit.
It consists of a buffer that stores a certain number of audio signals sampled by the sampling unit.
A Fourier transform unit that performs the Fourier transform based on the voice signal received from the buffer by the radio signal determination unit and generates the Fourier waveform.
A peak frequency detection unit that detects the maximum peak of the Fourier waveform and detects the peak wavelength of the Fourier waveform whose frequency of the maximum peak is within the predetermined range .
An effective collision determination device characterized by having.

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