KR20220140328A - Pitching practice assisting device, pitching practice assisting method and program stored in recording medium - Google Patents

Abstract

A pitching practice assisting device according to an embodiment of the present invention includes: a case including at least one first opening, and held by hand of a pitching practitioner; a sensor unit accommodated inside the case and detecting a physical measurement value of the case according to movement of the case; a processing unit calculating a virtual ball speed based on a pitching motion of the pitching practitioner based on the physical measurement value detected by the sensor unit; and a display unit for displaying the calculated ball speed.

Description

Pitching practice aid device, pitching practice aid method and program stored in recording medium

The present invention relates to pitching practice of baseball, and more particularly, to a pitching practice assisting device for assisting a pitching practice of a pitching practice, a pitching practice assisting method, and a program stored in a recording medium.

Due to the improvement of living standards, the number of people who directly enjoy sports as a leisure activity is increasing. A typical example of this is baseball. The number of people who not only go to professional baseball stadiums and enjoy watching them in person, but also directly participate in baseball games is increasing. It is estimated that about 200,000 people are active in the social baseball team, participate in the social baseball league, and enjoy social baseball.

The most important position in baseball is the pitcher. It takes a lot of practice to become a good pitcher. In order to practice pitching as a pitcher, you need a large space to throw a real baseball and a catcher to receive the pitch. Therefore, it is unreasonable to practice pitching every day as a baseball player, a society with restrictions on time, place, and cost.

The pitcher, who takes up the largest portion of the baseball game, conducts various training to improve the pitch and speed of the baseball. As a pitcher or a fielder, as a method that can be practiced other than actual training, there is shadow pitching (towel training) in which a player practices pitching with a towel in his hand rather than an actual baseball.

The best training to improve baseball skills is to invest a lot of time, but as a baseball player in a society where it is difficult to invest a lot of time and money, shadow pitching can be trained with only a towel in a narrow space. It can be very helpful in maintaining balance.

However, in the case of shadow pitching using a towel, there is no part for gripping with a finger in a general towel, so finger gripping is inconvenient. Also, I am curious about how much the ball speed will be due to the pitching motion that the practitioner performs in terms of pitching practice. In the case of pitching practice by throwing a real baseball, the ball speed can be measured with a speed gun, but there are not many cases where individuals purchase a speed gun. We need an additional person to measure the speed.

The present invention is intended to solve the problems of the prior art described above, and while it is possible to easily practice pitching using a towel, a pitching practice assisting device capable of grasping the ball speed by the pitching motion during pitching practice, pitching practice To provide auxiliary methods and programs.

As a means for solving the above-described problems, the pitching practice assisting device according to an embodiment of the present invention, including at least one first opening, the case for gripping the practitioner by hand; a sensor unit accommodated in the case and detecting a physical measurement value of the case according to the movement of the case; a processing unit for calculating a virtual ball speed by a pitching practice of a pitching practicer based on the physical measurement value detected by the sensor unit; and a display unit displaying the calculated ball speed.

In one embodiment, the first opening is disposed at the end of the case, it may have a rectangular shape extending along the outer edge of the end of the case so that a towel can be fitted in the first opening.

In one embodiment, the case may further include a second opening and a third opening having a shape through which the finger of a pitching practicer can be fitted.

In one embodiment, the sensor unit may include an acceleration sensor for measuring the acceleration value in the three-axis direction of the case and a gyro sensor for measuring angular acceleration in the three-axis direction according to the rotation of the case. .

In an embodiment, the processor may calculate the ball speed based on a plurality of measured values of acceleration. The processing unit may calculate the ball speed based on measured values of a plurality of angular accelerations. In addition, the processing unit may calculate the ball speed based on the plurality of measured values of the acceleration and the plurality of measured values of the angular acceleration.

In an embodiment, the processing unit may remove errors and drifts from the plurality of measurement values of accelerations and the plurality of measurement values of angular accelerations by a Kalman filter or a complementary filter.

In an embodiment, the processing unit calculates the ball speed when a plurality of measured values of gravitational acceleration or a plurality of measured values of angular acceleration is equal to or greater than a predetermined first threshold value, and the plurality of measured values of gravitational acceleration or a plurality of angular accelerations The ball speed may not be calculated when the measured value of is less than the first predetermined threshold value.

In an embodiment, the processing unit detects a maximum value from a plurality of measured values of gravitational acceleration or a plurality of measured values of angular acceleration, and based on a measured value of gravitational acceleration within a range of 70% to 100% of the detected maximum value The ball speed can be calculated.

In one embodiment, the processing unit can calculate the number of pitching practice action by counting the number of sets of measurement values greater than or equal to a predetermined first threshold value of the plurality of measured values of the acceleration due to gravity or the plurality of measured values of angular acceleration.

As a means for solving the above-described problem, the pitching practice assisting method according to an embodiment of the present invention is, while the pitching practicer holds the case including at least one first opening by hand and performs the throwing operation, the detecting a physical measurement value of the case according to the movement of the case by a sensor unit accommodated in the case; Calculating, by the processing unit, a virtual ball speed due to a throwing motion of a pitching practicer based on the detected physical measurement value; and displaying the calculated ball speed through a display unit disposed on the surface of the case.

As a means for solving the above-mentioned problems, the program according to an embodiment of the present invention may include a program stored in a recording medium to perform the pitching practice assisting method by a computer.

According to an embodiment of the present invention, a case for holding by a pitching practicer, a sensor unit for detecting a physical measurement value of the case according to the movement of the case, and a pitching operation based on the physical measurement value detected by the sensor unit By including a processing unit for calculating the virtual ball speed and a display unit for displaying the calculated ball speed, it is possible to easily practice pitching using a towel, and to be able to grasp the ball speed by the throwing motion during pitching practice. Practice aids, pitching practice aids methods and programs may be provided.

Figure 1a is a plan view of a pitching practice assisting device according to an embodiment of the present invention, Figure 1b is a rendering image of the pitching practice assisting device according to an embodiment of the present invention.
2 is a diagram illustrating an operation of a pitching practicer pitching using the pitching practice assisting device 1 according to an embodiment of the present invention.
Figure 3 is a block diagram showing the internal configuration of the case 100 of the pitching practice auxiliary device (1) according to an embodiment of the present invention.
4 is a flowchart of a ball speed calculation process performed by the processing unit according to an embodiment of the present invention.
5 is a flowchart of a ball speed calculation process performed by a processing unit according to another embodiment of the present invention.
6 is a flowchart of a ball speed calculation process performed using a complementary filter in a processing unit according to another embodiment of the present invention.
7 is a flowchart of a ball speed calculation process performed using a Kalman filter in a processing unit according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The terms used in the present invention have been selected as currently widely used general terms as possible while considering the functions in the present invention, but these may vary depending on the intention or precedent of a person skilled in the art, the emergence of new technology, and the like. In addition, in a specific case, there is a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term and the overall content of the present invention, rather than the name of a simple term.

In the entire specification, when a part "includes" a certain component, it means that other components may be further included, rather than excluding other components, unless otherwise stated. In addition, terms such as "... unit" and "module" described in the specification mean a unit that processes at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software. .

Hereinafter, with reference to the accompanying drawings, the embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the embodiments of the present invention. However, the present invention may be embodied in several different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Figure 1a is a plan view of a pitching practice auxiliary device (1) according to an embodiment of the present invention, Figure 1b is a rendering image of the pitching practice auxiliary device (1) according to an embodiment of the present invention.

1a and 1b, the pitching practice auxiliary device (1) includes a case 100, a first opening 110, a second opening 120, a third opening 130 and a display screen (140) can do.

The case 100 may be made of a shape and material for a throwing practice to grip by hand. 1A and 1B , the case 100 may be configured in a rectangular shape with rounded corners. However, the present invention is not limited to this embodiment, and any shape, such as a circle, an oval, a triangle, a polygon, etc., that can be gripped by a pitching practitioner by hand, may be used as the shape of the case 100 .

The first opening 110 may be disposed at one end of the case 100 . The first opening 110 may extend along the periphery of one end of the case 100 so that the towel can be inserted. The shape of the first opening 110 may be included within the scope of the technical idea of the present invention as long as the towel is inserted and the shape is such that it does not fall out during the pitching operation. A protrusion may be formed from the inside of the first opening 110 in the longitudinal direction of the case 100 so that the towel inserted into the first opening 110 does not fall out during the throwing operation. The pitching practitioner may practice pitching with a towel placed in the first opening 110 , or may practice pitching without putting a towel in the first opening 110 .

A second opening 120 and a third opening 130 may be formed in the case 100 . The pitcher may put two fingers (eg, index and middle fingers) in the second opening 120 and the third opening 130 . The shape, size, and arrangement of the second opening 120 and the third opening 130 are not particularly limited as long as the shape allows the pitcher to fit two fingers. 1A and 1B show an embodiment in which the second opening 120 and the third opening 130 are formed in the case 100, but the present invention is not limited to this embodiment, and the second opening 120 and the third opening 130 are formed in the case 100. An embodiment in which the opening 120 and the third opening 130 are not formed, and the shape of the case 100 is configured in a shape that can be gripped by a pitching practitioner is also included within the scope of the technical spirit of the present invention.

The display screen 140 may display information such as a ball speed calculated according to a ball speed calculation process to be described later. The display screen 140 may correspond to the display unit 240 to be described later, and may display information such as the ball speed calculated from the processing unit 210 through the screen. The display screen 140 may be disposed between the second and third openings 120 and 130 and the other end B of the case 100 as shown in FIGS. 1A and 1B . However, the arrangement position of the display screen 140 is not limited to this embodiment, and except for the positions of the first opening 110 , the second opening 120 , and the third opening 130 of the case 100 , the case It can be placed at any position on (100).

2 is a diagram illustrating an operation of a pitching practicer pitching using the pitching practice assisting device 1 according to an embodiment of the present invention.

As shown in FIG. 2 , the throwing practicer puts the towel 10 in the first opening 110 of the case 100 of the throwing practice auxiliary device 1 , and puts the fingers (index and middle fingers: 30) into the second The case 100 may be gripped by being inserted into the opening 120 and the third opening 130 .

When the pitching practicer performs a pitching operation, the case 100 changes the posture, position, and angular velocity as shown in FIG. 2 , and the pitching practice auxiliary device 1 detects the changing physical measurement value, the detected measurement value The ball speed may be calculated and displayed on the display screen 140 according to the ball speed calculation process of the present invention, which will be described later.

Figure 3 is a block diagram showing the internal configuration of the case 100 of the pitching practice auxiliary device (1) according to an embodiment of the present invention.

Referring to FIG. 3 , the inner body of the case 100 of the pitching practice assisting device 1 has a processing unit 210 , a sensor unit 220 , a power supply unit 230 , a display unit 240 , a storage unit 250 and a communication unit. (260).

The sensor unit 220 may include an acceleration sensor 220a, a gyro sensor 220b, and a temperature sensor 220c. The acceleration sensor 220a may measure the acceleration of the case 100 , the gyro sensor 220b may measure the angular velocity of the case 100 , and the temperature sensor 220c may measure the temperature.

In the embodiment of FIG. 3 , the sensor unit 220 is illustrated as including an acceleration sensor 220a , a gyro sensor 220b , and a temperature sensor 220c , but the sensor unit 220 responds to the movement of the case 100 . Accordingly, including any sensors such as a gyroscope and a speed sensor capable of calculating the speed of the virtual ball may be included in the technical scope of the present invention. As the sensor unit 220, the MPU-6050 having an operating voltage of 5V to 3.3V and having an I2C communication protocol may be used.

The processing unit 210 may calculate the ball speed of the virtual ball by the pitching motion based on the physical measurement value obtained from the sensor unit 220 . The calculated ball speed may be provided to the display unit 240 to be displayed on the display screen of the pitching practice assisting device 1 .

The power supply unit 230 may supply power to each unit for the operation of the sensor unit 220 , the processing unit 210 , the display unit 240 , the storage unit 250 , and the communication unit 260 . The power supply unit 130 may be configured using a rechargeable battery that can be charged and discharged or a battery that can be replaced. The power supply unit 130 may use any means as long as it is a power supply means capable of supplying light and stable power, and the technical spirit of the present invention is not limited to a specific power supply means.

The display unit 240 outputs and provides data provided from the processing unit 210 . To this end, the display unit 240 may include a device such as a small liquid crystal or OLED display screen, an LED capable of multi-color lighting, a speaker capable of sound output, and a vibration motor capable of outputting vibration.

The display unit 140 outputs and provides data output from the processing unit 210 in the form of simple text or images through the display screen, or lights up multi-color LEDs such as green, yellow, and red depending on the situation to allow the user to use the device 10 ) to determine the operating state of In addition, if voice output is possible, guidance may be provided through voice, but the present invention is not limited to this embodiment.

The storage unit 250 may store various measurement values provided from the sensor unit 220 , the ball speed calculation algorithm of the processing unit 210 , and analysis results of the pitching practice motion. A removable memory such as a micro SD card may be used as the storage unit 250 , and a fixed memory may also be used.

The communication unit 260 forms a wired or wireless communication channel with an external device such as an external communication terminal, and transmits data provided from the sensor unit 220 , data provided from the processing unit 210 , and data stored in the storage unit 250 . can be transmitted The communication unit 260 may be configured to include a USB port and a LAN port in addition to short-range wireless communication such as Wi-Fi and Bluetooth. Here, the external communication terminal may include a device such as a user's smartphone or a computer in addition to a dedicated terminal for providing ball speed calculation data, sensor measurement data, and pitch analysis results. In another embodiment, when the auxiliary apparatus 1 for pitching practice does not require a connection with an external communication terminal, the communication unit 260 may be omitted.

4 is a flowchart of a ball speed calculation process performed by the processing unit 210 according to an embodiment of the present invention.

The acceleration is measured by the acceleration sensor 220a of the sensor unit 220 (step S410), and the processing unit 210 determines whether the measured acceleration value is equal to or greater than a first threshold value (step S420).

If the acceleration measurement value is less than the first threshold value, the process returns to the acceleration measurement step by the acceleration sensor 220a (step S410). When the acceleration measurement value is equal to or greater than the first threshold value, the maximum value among the acceleration measurement value sets including a plurality of acceleration measurement values successively acquired by the acceleration sensor 220a is detected (step S430 ).

After detecting the maximum value, an acceleration measurement value included in the range of 70% to 100% of the maximum value from the acceleration measurement value set is selected (step S440). The processing unit 210 calculates the average of the selected acceleration measurement values, and calculates the ball speed according to the correspondence between the acceleration average value and the constraint (step S450).

The correspondence relationship between the average acceleration value and the restraint can be obtained by generating a correspondence relationship between the calculated average acceleration value and the velocity measured by the speed gun by performing an actual throw by a throwing motion similar to the actual value in the correspondence relation table. When the pitching practice assisting device 1 is manufactured, the correspondence table is recorded in the storage unit 250 , and the processing unit 210 uses the correspondence table recorded in the storage unit 250 to correspond to the average value of acceleration and the correspondence relationship between the restraints. The ball speed can be calculated according to The ball speed calculation process of the present invention is not limited to the ball speed calculation process shown in FIG. 4 , and any process for calculating the virtual ball speed based on the measurement value of the acceleration sensor 220a is also provided in the spirit of the present invention. may be included within the scope of

5 is a flowchart of a ball speed calculation process performed by a processing unit according to another embodiment of the present invention.

The angular acceleration is measured by the gyro sensor 220b of the sensor unit 220 (step S510). The processing unit 210 integrates the measured values of the angular accelerations continuously acquired from the sensor unit 220 (step S520). The processing unit 210 calculates the ball speed according to the relation between the integral value of the angular acceleration and the constraint (step S530).

The ball speed calculation process of the present invention is not limited to the ball speed calculation process shown in FIG. 5 , and any process for calculating the virtual ball speed based on the measured value of the gyro sensor 220b is also described in the technical spirit of the present invention. may be included within the scope of

In another embodiment, the processing unit 210 may calculate the ball speed by using both the plurality of acceleration measurement values acquired from the acceleration sensor 220a and the plurality of angular acceleration measurement values acquired from the gyro sensor 220b. According to the ball speed calculation process based on the acceleration measurement value obtained from the acceleration sensor 220a, accuracy is low in a fast moving state, and according to the ball speed calculation process based on the angular acceleration measurement value obtained from the gyro sensor 220b, in a short time Accuracy is high in a fast-moving state, but drift may occur due to accumulation of errors by integration processing. The processing unit 210 uses all of the plurality of acceleration measurement values obtained from the acceleration sensor 220a and the plurality of angular acceleration measurement values obtained from the gyro sensor 220b, and calculating the ball speed using a complementary filter or a Kalman filter. It is possible to reduce the effect of error accumulation and drift.

In addition, the processing unit 210 may calculate the number of times of the pitching practice of the pitching practice by counting the number of measurement value sets including a plurality of consecutive acceleration measurement values or a plurality of angular acceleration measurement values greater than or equal to a threshold value.

6 is a flowchart of a ball speed calculation process performed using a complementary filter in a processing unit according to another embodiment of the present invention.

Since the speed calculated based on the angular acceleration measured by the gyro sensor 220b has good response characteristics in the high frequency region, a high-pass filter is designed on the value obtained by integrating the output value of the gyro sensor 220b, and the acceleration sensor 220a Since the speed calculated based on the acceleration measured by ) has good response characteristics in a low frequency region, a low-pass filter may be designed on the output value of the acceleration sensor 220a to implement a complementary filter. An angle value according to the movement of the case 100 may be derived by summing output values output from each of the designed high-pass filter and the low-pass filter. Summarizing this, it can be expressed as Equation 1 below, and Equation 1 is shown as a circuit diagram as shown in FIG. 6 .

[Equation 1]

는 케이스(100)의 움직임에 대한 각도 산출의 결과값,

는 자이로 센서(220b)에서 측정된 각속도 값,

는 가속도 센서(220a)에서 측정된 각도값,

은 필터 계수를 나타낸다. here,

is the result of calculating the angle for the movement of the case 100,

is the angular velocity value measured by the gyro sensor 220b,

is the angle value measured by the acceleration sensor 220a,

is the filter coefficient.

)로부터 각속도 센서(220a)에서 출력된 각도값이 저역 통과 필터(미도시)를 통과한 이후의 각도값(

)을 감산한다. 제2 연산 수단에서는 제1 연산 수단에서 도출된 값에 필터 계수(

)를 곱한다. 제3 연산 수단에서는 자이로 센서(220b)에서 출력된 각속도 값이 고역 통과 필터(미도시)를 통과한 이후의 각속도 값(

)에서 제2 연산 수단에서 도출된 값을 뺀다. 그 후, 적분 수단을 이용하여 제3 연산 수단에서 도출된 값을 적분하여 피사체의 움직임에 따른 각도값을 도출할 수 있다. Referring to FIG. 6, first, the angle value (

) after the angle value output from the angular velocity sensor 220a passes through a low-pass filter (not shown) (

) is subtracted. In the second calculating means, the filter coefficient ( (

) is multiplied by In the third calculation means, the angular velocity value output from the gyro sensor 220b passes through a high pass filter (not shown).

) is subtracted from the value derived from the second calculation means. Thereafter, the angular value according to the movement of the subject may be derived by integrating the value derived from the third calculating means using the integrating means.

7 is a flowchart of a ball speed calculation process performed using a Kalman filter in a processing unit according to another embodiment of the present invention.

를 입력으로 받아 추정값인

가 출력된다. 칼만 필터의 제1 단계에서는 추정값과 오차 공분산을 예측한다. 제1 단계에서는 제2 단계 ~제4 단계에서 사용되는

와

를 계산한다. 이 때 계산에 사용되는 A는 시스템 행렬값으로 시스템이 어떻게 움직이는지를 나타낸다. Q 행렬은 상태 모델의 공분산 행렬로 시스템의 잡음을 표현하는 행렬이다.Using the Kalman filter, the measured value is

takes as input and the estimated value

is output The first stage of the Kalman filter predicts the estimate and the error covariance. In the first step, the second to fourth steps are used

Wow

to calculate In this case, A used in the calculation is a system matrix value and indicates how the system moves. The Q matrix is the covariance matrix of the state model and represents the noise of the system.

를 계산한다. 이 때 사용되는 H 행렬은 측정값과 상태 변수와의 관계를 나타내고, R 행렬은 측정 잡음을 나타내는 공분산 행렬이다. Q 행렬과 R 행렬은 각 잡음의 분산으로 구성된

의 대각 행렬로 구성된다. In the second stage, the Kalman gain

to calculate The H matrix used at this time represents the relationship between the measured value and the state variable, and the R matrix is a covariance matrix representing the measurement noise. The Q matrix and the R matrix are composed of the variance of each noise.

It consists of a diagonal matrix of

In the third step, the estimated value is calculated using the input measurement values, and in the fourth step, the error covariance is calculated to evaluate how accurate the estimated value is. By examining this error covariance, we can determine the reliability of the previously calculated estimate.

The steps or processes described above may be executed by a hardware component, a software component, and/or a combination of the hardware component and the software component. For example, a step or process described in the embodiments may be, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable array (FPA), a PLU It may be implemented using one or more general purpose or special purpose computers, such as a programmable logic unit, microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For convenience of understanding, although one processing device is sometimes described as being used, one of ordinary skill in the art will recognize that the processing device includes a plurality of processing elements and/or a plurality of types of processing elements. It can be seen that may include For example, the processing device may include a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as parallel processors.

Software may comprise a computer program, code, instructions, or a combination of one or more thereof, which configures a processing device to operate as desired or is independently or collectively processed You can command the device. The software and/or data may be any kind of machine, component, physical device, virtual equipment, computer storage medium or device, to be interpreted by or to provide instructions or data to the processing device. , or may be permanently or temporarily embody in a transmitted signal wave. The software may be distributed over networked computer systems and stored or executed in a distributed manner. Software and data may be stored in one or more computer-readable recording media.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the embodiment, or may be known and used by those skilled in the art. Examples of the computer-readable recording medium include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic such as floppy disks. - includes magneto-optical media, and hardware devices specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

As described above, although the embodiments have been described with reference to the limited embodiments and drawings, various modifications and variations are possible by those skilled in the art from the above description. For example, the described techniques are performed in a different order than the described method, and/or the described components of the system, structure, apparatus, circuit, etc. are combined or combined in a different form than the described method, or other components Or substituted or substituted by equivalents may achieve an appropriate result.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (13)

a case including at least one first opening and for gripping by a throwing practitioner by hand;
a sensor unit accommodated in the case and detecting a physical measurement value of the case according to the movement of the case;
a processing unit for calculating a virtual ball speed by a pitching practice of a pitching practicer based on the physical measurement value detected by the sensor unit; and
A display that displays the calculated ball speed
A pitching practice aid comprising a. According to claim 1,
The first opening is disposed at the end of the case, pitching practice assisting device having a rectangular shape extending along the periphery of the end of the case so that the towel can be fitted in the first opening. According to claim 1,
The case is a pitching practice assisting device further comprising a second opening and a third opening having a shape that can be fitted with the finger of the practice pitcher. According to claim 1,
The sensor unit pitching practice assisting device comprising an acceleration sensor for measuring the acceleration value in the three-axis direction of the case and a gyro sensor for measuring the angular acceleration in the three-axis direction according to the rotation of the case. 5. The method of claim 4,
The processing unit is a pitching practice assisting device for calculating the ball speed based on the measured values of a plurality of accelerations. 5. The method of claim 4,
The processing unit is a pitching practice assisting device for calculating the ball speed based on the measured values of a plurality of angular acceleration. 5. The method of claim 4,
The processing unit is a pitching practice assisting device for calculating the ball speed based on a plurality of measured values of acceleration and a plurality of measured values of angular acceleration. 8. The method of claim 7,
The processing unit is a pitching practice assisting device for removing errors and drifts from the measured values of the plurality of accelerations and the measured values of the plurality of angular accelerations by the Kalman filter or the complementary filter. 5. The method of claim 4,
The processing unit calculates the ball speed when the plurality of measured values of gravitational acceleration or the plurality of measured values of angular accelerations is equal to or greater than a predetermined first threshold value, and the plurality of measured values of gravitational accelerations or measured values of the plurality of angular accelerations are preset. A pitching practice assisting device that does not calculate the ball speed when it is less than the determined first threshold. 5. The method of claim 4,
The processing unit detects a maximum value from a plurality of measured values of gravitational acceleration or a plurality of measured values of angular acceleration, and calculates the ball speed based on the measured value of gravitational acceleration within a range of 70% to 100% of the detected maximum value pitching practice aid. 5. The method of claim 4,
The processing unit is a pitching practice assisting device for calculating the number of pitching practice action by counting the number of sets of measured values of a plurality of measured values of a plurality of gravitational accelerations or a plurality of measured values of angular accelerations equal to or greater than a predetermined first threshold value. Detecting the physical measurement value of the case according to the movement of the case by the sensor unit accommodated inside the case while the pitching practicer grips the case including at least one first opening by hand and performs a throwing operation step;
Calculating, by the processing unit, a virtual ball speed due to a throwing motion of a pitching practicer based on the detected physical measurement value; and
Displaying the calculated ball speed through a display unit disposed on the surface of the case
A method of assisting pitching practice that includes. A program stored in a recording medium for performing the pitching practice assisting method according to claim 12 by a computer.

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