TWI700114B - Tennis serve training system and method thereof - Google Patents

Abstract

A tennis serve training system is provided. When sensing that a tennis ball is close to a preset height and in a preset serve area, a training device outputs a hitting signal to prompt a user to hold a smart racket to hit the tennis ball. During the serve, the smart racket continuously senses its acceleration and angular velocity to transmit a current acceleration signal and a current angular velocity signal to the training device. When the smart racket hits the tennis ball, the smart racket senses a vibration amount of net lines thereof to transmit a vibration signal to the training device. The training device obtains the movement track of the smart racket according to the current acceleration signals and the current angular velocity signals, determines the hitting point of the smart racket according to the vibration signal, and outputs feedback data according to the movement track and the hitting point of the smart racket. Therefore, the user can train for the correct hitting timing and serve angle.

Description

Tennis serve training system and method

The invention relates to a serve training system and method, in particular to a tennis serve training system and method.

With the improvement of living standards, people pay more and more attention to exercise through sports. Among them, the number of people who choose ball sports is the largest, such as tennis, billiards, etc., which are very suitable for men, women, old and young. movement.

In the tennis training process, one of the most important techniques is serving. By choosing the most suitable serving position to send the tennis ball to the opponent to suppress the opponent's offensive, it can greatly increase the chance of winning the game. In the course of the serve, the emphasis is on: (1) The throwing route is stable and in the correct serve position or range, (2) the posture of the shot, and (3) the hitting position after the throw.

It can be seen that the tossing and hitting actions need to be coordinated at the same time when serving the ball. Therefore, a coach or others must assist in the judgment or guidance, but there is a problem that the player's independent training is inconvenient.

The invention discloses a tennis serve training system and method.

First, the present invention discloses a tennis serve training system, which includes a smart racket and a training device, and the training device is wirelessly connected to the smart racket. Among them, the smart racket includes: a frame part, a handle part and a grip part. The frame part includes a frame body, a plurality of network cables and a vibration sensor module. The network cables are criss-crossed on the frame body. A mesh surface is formed, and the vibration sensing module is connected to the network cables to sense the amount of vibration of the network cables when the mesh surface touches the tennis ball to output corresponding vibration signals; the bottom of the self-timer frame of the handle The extension is formed by the bundle; the grip part is connected to the handle part and includes a transmission module and a three-axis sensor module, the transmission module is connected to the three-axis sensor module, and the three-axis sensor module is used to continuously sense the grip And output the current acceleration signal and the current angular velocity signal; the transmission module is used to receive and transmit the current acceleration signal, the current angular velocity signal and some vibration signals. The training device includes: a sensing module, a processing module, and a display module. The sensing module is used to output a hitting signal when the tennis ball is close to the preset height of the corresponding user and is located in the preset service area; The group is used to obtain the movement trajectory of the grip part according to the current acceleration signals and the current angular velocity signals during the serve of the user, determine the position where the net touches the tennis ball according to the vibration signal, and according to the serve process of the user The movement track of the middle grip and the position where the net touches the tennis ball output feedback data; the display module is connected to the processing module and used to display the feedback data.

In addition, the present invention discloses a tennis serve training method. The steps include: providing a tennis serve training system. The tennis serve training system includes a smart racket and a training device. The training device is wirelessly connected to the smart racket. The smart racket includes a racket frame and a handle. Part and a holding part. The frame part includes a frame body, a plurality of network cables and a vibration sensor module. The network cables are crisscrossed through the frame body to form a network surface, and the vibration sensor module is connected to the These cables are formed by extending and constricting the bottom of the self-timer frame of the handle. The grip is connected to the handle and includes a transmission module and a three-axis sensor module. The transmission module is connected to the three-axis sensor module for training. The device includes a sensing module, a processing module and a display module, and the display module is connected to the processing module; The three-axis sensing module continuously senses the acceleration and angular velocity of the grip, and outputs the current acceleration signal and the current angular velocity signal; the transmission module receives and transmits the current acceleration signal and the current angular velocity signal to the training device; when the sensing module senses When the tennis ball is close to the preset height corresponding to the user and is located in the preset serving area, the sensing module outputs a hitting signal; when the net surface touches the tennis ball, the vibration sensing module senses the amount of vibration of the net cables to Output the corresponding vibration signal; the transmission module receives and transmits the vibration signal to the training device; the processing module obtains the movement trajectory of the grip according to the current acceleration signals and the current angular velocity signals during the serve of the user; The module determines the position where the net touches the tennis ball according to the vibration signal; the processing module outputs feedback data according to the movement track of the grip part and the position where the net touches the tennis ball during the course of the user's serve; and the display module displays the feedback data.

The system and method disclosed in the present invention are as above. The difference from the prior art is that the present invention uses the training device to sense that when the tennis ball is located at the preset service area and is close to the preset height, it outputs the hitting signal to remind the user to hold the smart The racket hits the ball; the smart racket continuously senses its acceleration and angular velocity during the serve, to transmit the current acceleration signal and the current angular velocity signal to the training device; when the smart racket touches the tennis ball, it senses the amount of vibration of the net line, The vibration signal is transmitted to the training device; the training device obtains the movement trajectory of the smart racket according to the current acceleration signals and the current angular velocity signals, judges the hitting point of the smart racket according to the vibration signal, and according to the movement trajectory and hitting of the smart racket Click the output feedback data.

Through the above technical means, the present invention can train the user to correct swing timing and serve angle.

50: frame

52: network cable

54: Vibration sensor module

56: Mesh

60: Transmission module

62: Three-axis sensing module

70: tracking unit

80: Motion posture sensor

100: Tennis serve training system

110: Smart Racket

112: Frame Department

114: Handle

116: Grip

120: training device

122: Sensing module

124: Processing Module

126: display module

128: camera module

Step 210: Provide a tennis serve training system. The tennis serve training system includes a smart racket and a training device. The training device is wirelessly connected to the smart racket. The smart racket includes a racket frame, a handle, and a grip. The racket frame includes a frame. , A plurality of network cables and vibration sensor modules, the network cables are criss-crossed through the frame to form a mesh surface, the vibration sensor module is connected to the network cables, and the bottom of the self-timer frame of the handle The extension is formed by the bundle, the grip part is connected to the handle part and includes a transmission module and a three-axis sensor module, the transmission module is connected to the three-axis sensor module, and the training device includes a sensing module, a processing module and a display Module, display module connection processing module

Step 220: The three-axis sensing module continuously senses the acceleration and angular velocity of the grip, and outputs the current acceleration signal and the current angular velocity signal

Step 230: The transmission module receives and transmits the current acceleration signal and the current angular velocity signal to the training device

Step 240: When the sensing module senses that the tennis ball is close to the predetermined height corresponding to the user and is located in the predetermined serving area, the sensing module outputs a hitting signal

Step 250: When the net surface touches the tennis ball, the vibration sensor module senses the amount of vibration of the net cables to output a corresponding vibration signal

Step 260: The transmission module receives and transmits the vibration signal to the training device

Step 270: The processing module obtains the movement trajectory of the grip according to the current acceleration signals and the current angular velocity signals during the serve of the user

Step 280: The processing module determines where the net surface touches the tennis ball according to the vibration signal

Step 290: The processing module outputs feedback data according to the movement trajectory of the grip and the position where the net touches the tennis ball during the serve of the user

Step 300: The display module displays the feedback data

Figure 1 is a system diagram of an embodiment of the tennis serve training system of the present invention.

Figures 2A and 2B are flowcharts of an embodiment of the tennis serve training method performed by the tennis serve training system of Figure 1.

Before describing the tennis serve training system and method disclosed in the present invention, firstly, the terms defined by the present invention will be explained. The smart racket and training device included in the tennis serve training system of the present invention can mainly use hardware methods. Realize, can work together with software or firmware at the same time. Among them, the software or firmware used in the technology proposed in the implementation can be stored on machine-readable storage media, such as: read-only memory (ROM), random access memory (RAM), disk storage media, optical Storage media, flash memory devices, etc., and can be executed by one or more general-purpose or special-purpose programmable microprocessors. The smart racket and the training device of the present invention can communicate with each other through wireless communication technology to transmit signals and data. Among them, the wireless communication technology may be, but not limited to, Zigbee, Bluetooth, wireless broadband (wireless broadband) or ultra-wideband (UWB). The modules included in the smart racket of the present invention (that is, between any two of the vibration sensor module, the transmission module and the three-axis sensor module) can be connected to each other in a wireless or wired manner , In order to carry on the signal and the data transmission.

Hereinafter, the implementation of the present invention will be described in detail with the drawings and embodiments, so as to fully understand and implement the implementation process of how the present invention uses technical means to solve technical problems and achieve technical effects.

Please refer to "Figure 1". "Figure 1" is a system diagram of an embodiment of the tennis serve training system of the present invention. In this embodiment, the tennis serve training system 100 may include: a smart racket 110 The smart racket 110 is wirelessly connected to the training device 120 and the training device 120. The training device 120 can be, but not limited to, a server computer, a desktop computer, a notebook computer, a tablet computer, or a smart phone.

In this embodiment, the smart racket 110 may include a frame portion 112, a handle portion 114, and a holding portion 116. The frame portion 112 may include a frame body 50, a plurality of network cables 52, and a vibration sensor module 54, which The network cables 52 are criss-crossed on the frame 50 to form a mesh surface 56, the vibration sensor module 54 is connected to the network cables 52, and the handle 114 is formed by extending and converging the bottom of the self-timer frame 112. The grip 116 is connected to the handle 114. Wherein, the vibration sensing module 54 can be used to sense the amount of vibration of the net wires 52 when the net surface 56 touches a tennis ball (not drawn) to output a corresponding vibration signal. In more detail, the vibration sensor module 54 may include a processing unit (not shown) and a plurality of vibration sensors (not shown), the processing unit is connected to the vibration sensors, the vibration sensors are connected to the network cables 52, When the surface 56 touches a tennis ball (not drawn), the vibration sensors sense the vibration of the network cable 52 connected thereto, and output corresponding sensing signals to the processing unit. The processing unit integrates the sensing signals to output the vibration signal. It should be noted that, in order to avoid the diagram from being too complicated, the connection relationship between the vibration sensor module 54 and the network cables 52 and the processing units and multiple numbers included in the vibration sensor module 54 are not drawn in the diagram. For each vibration sensor, only a single box indicates the position of the vibration sensor module 54 at the frame portion 112.

The grip 116 may include a transmission module 60 and a three-axis sensing module 62. The transmission module 60 is connected to the three-axis sensing module 62. The three-axis sensing module 62 can continuously sense the acceleration of the grip 116 And the angular velocity, and output the current acceleration signal and the current angular velocity signal; the transmission module 60 is used to receive and transmit the current acceleration signal, the current angular velocity signal and the vibration signal to the training device 120.

The training device 120 may include a sensing module 122, a processing module 124, and a display module 126. The sensing module 122 may be used to sense the position of the tennis ball after the user throws the ball. In more detail, the sensing module 122 Can be set at the relative position of the preset service area, because the sensing module can be obtained when the sensing module 122 is set 122 and the ground, and the sensing module 122 can use distance sensing technology (for example: depth-sensing photography or optical distance sensing) to continuously measure and obtain the distance between it and the tennis ball. Therefore, the sensing module Group 122 can obtain the current height of the tennis ball from the ground; when the sensing module 122 senses that the tennis ball is close to the preset height of the corresponding user (that is, the current height of the tennis ball from the ground is close to the preset height of the corresponding user) and is located at the preset serve During zone time, the sensing module 122 outputs a hitting signal. Among them, the batting signal can be, but not limited to, a sound signal (in other words, outputting a batting signal means prompting the user to hit the ball by sound) or a luminous signal (in other words, outputting a batting signal means illuminating Prompt the user to hit the ball).

It should be noted that since the preset height is the user's best hitting height, but the user needs to start the hitting action after receiving the hitting signal, the sensing module 122 can be based on the user's receiving The reaction time required after the hit signal (for example: the reaction time of the average person to sound stimulation is 0.12 to 0.18 seconds; the reaction time of the average person to light stimulation is 0.19 to 0.22 seconds), the time required for the user to perform the hitting action ( For example: 1 second), the preset height and gravity calculate the height at which the tennis ball needs to be output, so that the user can hit the ball when the tennis ball is at the preset height. The sensing module 122 The calculated height should be close to the preset height of the corresponding user. Therefore, when the sensing module 122 senses that the tennis ball is close to the preset height of the corresponding user (that is, the current height of the tennis ball from the ground is close to the preset height of the corresponding user) and is located in the preset serving area, the sensing module 122 outputs The hit signal.

In one embodiment, the sensing module 122 can also be used to continuously sense the current ball speed of the tennis ball. Therefore, the sensing module 122 can sense the current ball speed when the tennis ball is close to a predetermined height and is located in the predetermined service area. Since the speed of the tennis ball at the preset height (that is, the user's best hitting height) is the slower the better or the closer to zero the better, therefore, when the sensing module 122 senses that the tennis ball is close to the preset height and is located When the current ball speed is greater than a predetermined ball speed when the tennis ball is close to the preset height and is located in the preset service area, the sensing module 122 does not output the ball hitting signal. Among them, the predetermined ball speed can be adjusted according to actual needs.

In this embodiment, the training device 120 may further include a camera module 128, which is connected to the sensing module 122. The camera module 128 can be used to capture a full-body image of the user and analyze it using depth image cutting technology. The whole body image is used to obtain the height of the user and the distance from the wrist to the shoulder, based on the height of the user and the distance from the wrist to the shoulder, and the length of the smart racket 110 (for example, the length of the smart racket 110 The length can be but is not limited to 27 inches) to calculate the preset height corresponding to the user, but this embodiment is not intended to limit the present invention. For example, the preset height corresponding to the user can be estimated by the user and input the preset height into the training device 120.

In this embodiment, the sensing module 122 may include a tracking unit 70, and the tracking unit 70 may be used to track the current position of the user to obtain the predetermined service area corresponding to the user. Among them, according to the theory of sports mechanics, the best area to serve is on the plane of 45° in front of the body. Therefore, the user's corresponding preset service area can be, but not limited to, the area of the user's front right 45° or the front left 45° The area of the area can be a preset area size, but this embodiment is not intended to limit the present invention, and the preset service area corresponding to the user can be adjusted according to actual needs.

In this embodiment, the processing module 124 can be used to obtain the movement trajectory of the grip 116 during the user's serve according to the current acceleration signals and the current angular velocity signals during the serve of the user, and according to the vibration The signal determines the position where the net surface 56 touches the tennis ball (because the net wire 52 actually touches the tennis ball has a large amount of vibration, and the net wires 52 are criss-crossed through the frame 50, the processing module 124 can obtain the vibration signal Determine the position where the net surface 56 touches the tennis ball), and output feedback data according to the movement track of the grip 116 during the service of the user and the position where the net surface 56 touches the tennis ball. Wherein, the process of serving the ball by the user is a period of time before the net surface 56 touches the tennis ball, that is, the time required for the user to perform the hitting action, which may be but not limited to 1 second. In other words, the processing module 124 can obtain the movement trajectory of the grip 116 and the position where the net surface 56 touches the tennis ball in the process of the user's serve, and compare it with the grip The standard movement trajectory of the holding portion 116 is compared with the standard position of the net 56 touching the tennis ball and the feedback data is output. The display module 126 is connected to the processing module 124 and used to display the feedback data for the user to refer to and adjust his serve gesture. Therefore, the tennis serve training system 100 can train the user on the correct swing timing and serve angle.

In this embodiment, the training device 120 may also include a plurality of motion posture sensors 80, which are arranged on specific parts of the user's body (for example: hands, torso, legs, head, wrists, knees, shoes) ), used to sense the user’s movement and wirelessly transmit the corresponding sensing signal to the processing module 124. The processing module 124 can establish the user’s movement posture based on the sensing signal and compare it with the standard After the action posture is compared, the suggestion data is output, and the display module 126 displays the suggestion data. In other words, the training device 120 can also use a plurality of motion posture sensors 80 worn on specific parts of the body to sense and obtain the posture and continuous motion of each specific part of the body during the serve. After comparing with the standard posture and standard continuous action (ie, standard action posture) corresponding to each specific body part, suggestion data is output, and the display module 126 displays the suggestion data for the user to refer to and adjust his serve posture. Among them, the acquisition of the standard action posture can be, but is not limited to, arranging the action posture sensors 80 on specific parts of the coach’s body in advance to sense and obtain the posture and continuous actions of each specific part of the coach’s body when serving. Then obtain the standard posture. Therefore, the tennis serve training system 100 can train the user on the correct swing timing and serve angle.

Next, please refer to "Figure 2A" and "Figure 2B". "Figure 2A" and "Figure 2B" are the method flowcharts of an embodiment of the tennis serve training method performed by the tennis serve training system of "Figure 1" , The steps include: providing a tennis serve training system, the tennis serve training system includes a smart racket and a training device, the training device is wirelessly connected to the smart racket, wherein the smart racket includes a racket frame, a handle, and a grip, and the racket frame includes Frame, multiple network cables and vibration sensor module, these network cables cross vertically and horizontally Wrongly pierced on the frame to form a mesh surface, the vibration sensing module is connected to the network cables, the bottom of the frame of the handle part is extended and constricted, and the grip part is connected to the handle part and includes a transmission module Group and three-axis sensing module, the transmission module is connected to the three-axis sensing module, the training device includes a sensing module, a processing module and a display module, and the display module is connected to the processing module (step 210); The sensing module continuously senses the acceleration and angular velocity of the grip, and outputs the current acceleration signal and the current angular velocity signal (step 220); the transmission module receives and transmits the current acceleration signal and the current angular velocity signal to the training device (step 230); When the sensing module senses that the tennis ball is close to the user's preset height and is located in the preset service area, the sensing module outputs a hitting signal (step 240); when the net surface touches the tennis ball, the vibration sensing module senses Measure the amount of vibration of the network cables to output the corresponding vibration signal (step 250); the transmission module receives and transmits the vibration signal to the training device (step 260); the processing module is based on the user during the serve. The current acceleration signal and the current angular velocity signals obtain the movement trajectory of the grip (step 270); the processing module determines the position where the net touches the tennis ball according to the vibration signal (step 280); the processing module determines the position of the tennis ball according to the user's serve The movement track of the grip and the position where the net touches the tennis ball output feedback data (step 290); and the display module displays the feedback data (step 300).

Through the above steps, the user can be trained in the correct swing timing and serve angle. The detailed description has been described above and will not be repeated here.

The tennis serve training method may further include the following steps: the sensing module continuously senses the current ball speed of the tennis ball; and when the sensing module senses that the tennis ball is close to the preset height and is located in the preset serving area, and determining that the current ball speed is greater than the predetermined ball speed When the sensor module does not output the hitting signal. The detailed description has been described above and will not be repeated here.

In addition, the training device may further include a camera module, which is connected to the sensing module, and the tennis serve training method may further include the following steps: the camera module captures the user’s full body image to obtain The height of the user and the distance from the wrist to the shoulder; and the camera module calculates the preset height corresponding to the user according to the height of the user and the distance from the wrist to the shoulder and the length of the smart racket. The detailed description has been described above and will not be repeated here.

In addition, the sensing module may include a tracking unit, and the tracking unit is used to track the user's current position to obtain the user's corresponding preset service area. The detailed description has been described above and will not be repeated here.

Furthermore, the training device may also include a plurality of motion posture sensors, which are arranged on specific parts of the user’s body. The tennis serve training method may further include the following steps: the motion posture sensors sense the user’s actions to Wirelessly transmit the corresponding sensing signal to the processing module; and the processing module establishes the user's action posture based on the sensed signal, and compares it with the standard action posture to output suggested data, and the display module displays the suggested data . The detailed description has been described above and will not be repeated here.

It should be noted that if there is no causal relationship between the above steps, the present invention does not limit the order of execution.

In summary, it can be seen that the difference between the present invention and the prior art is that the training device senses that the tennis ball is located in the preset serving area and is close to the preset height, and then outputs the hitting signal to remind the user to hold the smart racket for hitting. The ball; the smart racket continuously senses its acceleration and angular velocity during the serve to transmit the current acceleration signal and the current angular velocity signal to the training device; when the smart racket touches the tennis ball, it senses the amount of vibration of the network cable it has to transmit the vibration Signal to the training device; the training device obtains the movement trajectory of the smart racket according to the current acceleration signals and the current angular velocity signals, judges the hitting point of the smart racket according to the vibration signal, and outputs feedback according to the movement trajectory and hitting point of the smart racket Data, through this technical means, the user can be trained in the correct swing timing and serve angle.

Although the present invention is disclosed in the foregoing embodiments as above, it is not intended to limit the present invention. Anyone familiar with similar art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of patent protection shall be determined by the scope of the patent application attached to this specification.

50: frame

52: network cable

54: Vibration sensor module

56: Mesh

60: Transmission module

62: Three-axis sensing module

70: tracking unit

80: Motion posture sensor

100: Tennis serve training system

110: Smart Racket

112: Frame Department

114: Handle

116: Grip

120: training device

122: Sensing module

124: Processing Module

126: display module

128: camera module

Claims (10)

A tennis serve training system, which includes: a smart racket, which includes: a racket frame, including a frame, a plurality of network cables and a vibration sensing module, the network cables are criss-crossed through the frame A mesh surface is formed on the body, and the vibration sensing module is connected to the network cables to sense the vibration amount of the network cables when the mesh surface touches a tennis ball to output a corresponding vibration signal; The handle part is formed by extending and converging from the bottom of the frame part; and a holding part connected to the handle part includes a transmission module and a three-axis sensor module, the transmission module is connected to the three Axis sensing module, the three-axis sensing module is used to continuously sense an acceleration and an angular velocity of the holding part, and output a current acceleration signal and a current angular velocity signal; the transmission module is used to receive and transmit The current acceleration signal, the current angular velocity signal, and the vibration signal; and a training device, wirelessly connected to the smart racket, including: a sensing module for sensing that the tennis ball is close to a preset corresponding to a user When the height is located in a predetermined serving zone, a hitting signal is output; a processing module is used to obtain the movement of the grip part according to the current acceleration signals and the current angular velocity signals during the serve of the user Trajectory, judging the position where the net touches the tennis ball according to the vibration signal, and outputting a feedback data according to the movement trajectory of the grip part during the serve of the user and the position of the net touching the tennis ball; and a display model Group, connected to the processing module to display the feedback data. According to the tennis serve training system described in claim 1, wherein the sensing module is also used to continuously sense a current ball speed of the tennis, when the sensing module senses that the tennis is close to the preset height And when the current ball speed is greater than a predetermined ball speed when it is determined that the tennis ball is close to the preset height and is located in the preset service area, the sensing module does not output the hitting signal. According to the tennis serve training system described in item 1 of the patent application, the training device further includes a camera module connected to the sensing module for capturing a whole body image of the user to obtain the use The height of the user and the distance from the wrist to the shoulder are calculated based on the height of the user and the distance from the wrist to the shoulder and the length of the smart racket to calculate the preset height corresponding to the user. According to the tennis serve training system described in claim 1, wherein the sensing module includes a tracking unit for tracking the current position of the user to obtain the preset corresponding to the user Teeing court. The tennis serve training system according to item 1 of the scope of patent application, wherein the training device further includes a plurality of motion posture sensors arranged on a specific part of the user's body, and each motion posture sensor is used to sense Detect the user's movement and wirelessly transmit corresponding sensing signals to the processing module. The processing module establishes the user's movement posture based on the sensed signals, and compares it with the standard movement posture Output a piece of suggestion data, make the display module display the suggestion data. A tennis serve training method, the steps include: providing a tennis serve training system, the tennis serve training system includes a smart racket and a training device, the training device is wirelessly connected to the smart racket, wherein the The smart racket includes a frame, a handle, and a grip. The frame includes a frame, a plurality of network cables, and a vibration sensor module. The network cables are criss-crossed through the A mesh surface is formed on the frame, the vibration sensing module is connected to the network cables, the handle portion is formed by extending and converging from the bottom of the frame portion, and the grip portion is connected to the handle portion and includes a The transmission module is connected to a three-axis sensing module, the transmission module is connected to the three-axis sensing module, the training device includes a sensing module, a processing module, and a display module, the display module is connected The processing module; the three-axis sensing module continuously senses an acceleration and an angular velocity of the grip portion, and outputs a current acceleration signal and a current angular velocity signal; the transmission module receives and transmits the current acceleration signal and The current angular velocity signal is provided to the training device; when the sensing module senses that a tennis ball is close to a predetermined height corresponding to a user and is located in a predetermined serving area, the sensing module outputs a hitting signal; when When the net surface touches the tennis ball, the vibration sensor module senses the amount of vibration of the net cables to output a corresponding vibration signal; the transmission module receives and transmits the vibration signal to the training device; the processing module The group obtains the movement trajectory of the grip part according to the current acceleration signals and the current angular velocity signals during the serve of the user; the processing module determines the position where the net surface touches the tennis ball according to the vibration signal; the processing The module outputs a feedback data according to the movement trajectory of the grip portion and the position where the net surface touches the tennis ball during the serve of the user; and the display module displays the feedback data. The tennis serve training method according to item 6 of the scope of patent application, wherein the tennis serve training method further includes the following steps: the sensing module continuously senses a current ball speed of the tennis; and when the sensing module senses When the current ball speed is greater than a predetermined ball speed when the tennis ball is close to the preset height and is located in the preset service area and the current ball speed when it is determined that the tennis ball is close to the preset height and located in the preset service area, the sensing module does not output the The hit signal. According to the tennis serve training method described in item 6 of the scope of patent application, the training device further includes a camera module connected to the sensing module, and the tennis serve training method further includes the following steps: the camera The module captures a full-body image of the user to obtain the user's height and the distance from the wrist to the shoulder; and the camera module based on the user's height and the distance from the wrist to the shoulder and The length of the smart racket calculates the preset height corresponding to the user. According to the tennis serve training method described in claim 6, wherein the sensing module includes a tracking unit for tracking the current position of the user to obtain the preset corresponding to the user Teeing court. According to the tennis serve training method described in item 6 of the scope of patent application, the training device further includes a plurality of motion posture sensors disposed on a specific part of the user's body, and the tennis serve training method further includes the following steps: Each of the motion posture sensors senses the user's motion and wirelessly transmits a corresponding sensing signal to the processing module; and The processing module establishes the user's action posture according to the sensing signals, and compares it with the standard action posture and outputs a suggestion data, so that the display module displays the suggestion data.

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