Embedded Tennis Racket Sensor for Real-Time Stroke Analysis
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Solution Overview
Problem
Conventional performance tracking systems for tennis players are ineffective in measuring and displaying real-time racket and stroke information, requiring manual analysis and video analysis, which is cumbersome and not suitable for live feedback, especially for players on opposite sides of a court, and lack the ability to provide detailed data on various strokes.
Innovation Solution
A lightweight sensor chip embedded in a tennis racket shaft/frame, equipped with a 3-axis accelerometer, gyroscope, pressure sensor, and wireless transmitter, transmitting data to a computer application for real-time analysis and display of swing speed, swing type, and stroke number, providing easy-to-understand graphical and textual feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If video analysis and manual analysis are used to track tennis performance, then detailed performance data can be obtained, but the process becomes cumbersome and cannot provide real-time feedback
Solution Approach 1:
The patent replaces manual video analysis with an automated sensor-based system. Sensors embedded in the racket (accelerometers, gyroscopes, pressure sensors) automatically capture motion data, eliminating the need for manual video recording and analysis. This substitution of mechanical/manual processes with automated electronic sensing resolves the contradiction by providing both accurate measurement and ease of operation.
Solution Approach 2:
The system enables self-service performance tracking where the racket itself captures and transmits performance data without requiring external video equipment or manual analysis. The embedded sensors and wireless transmitter allow the racket to autonomously collect and communicate stroke information, swing speed, and racket orientation data to training devices, making the process simple and automatic.
2Loss of information
If video analysis is used to track multiple players on opposite sides of the court, then performance data can be collected, but data collection becomes difficult and complex
Solution Approach 1:
The patent replaces complex multi-camera video analysis systems with simple embedded sensors in each racket. Each racket independently captures its own performance data through accelerometers, gyroscopes, and pressure sensors, eliminating the need for multiple cameras and complex synchronization systems. This resolves the contradiction by providing complete information for multiple players while simplifying the system architecture.
Solution Approach 2:
The system divides the performance tracking function into independent segments - each racket contains its own sensors and transmitter that independently capture and transmit data. This segmentation allows multiple players to be tracked simultaneously without requiring a centralized complex system, as each racket operates autonomously to collect and communicate its own performance data.
3Speed
If conventional performance trackers are used, then some performance data can be obtained, but real-time tracking and detailed stroke information cannot be provided
Solution Approach 1:
The patent replaces conventional slow performance tracking methods with real-time wireless sensor data transmission. The embedded sensors continuously capture motion data and the wireless transmitter sends this information in real-time to training devices, enabling both immediate feedback and detailed stroke analysis. This resolves the contradiction by providing both speed (real-time transmission) and measurement precision (detailed sensor data).
Solution Approach 2:
The system ensures continuous data collection and transmission throughout the tennis match or practice session. The sensors continuously monitor racket motion, and the wireless transmitter continuously communicates data to the training device, providing uninterrupted real-time feedback and complete detailed information for every stroke without gaps or interruptions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient and real-time tracking and analysis of tennis racket and stroke performance, allowing players and trainers to improve their game with detailed statistical data without relying on video analysis, suitable for players of all ages and skill levels.
Implementation Method 1
the chip includes a 3-axis accelerometer for measuring acceleration and linear direction during a stroke/swing made by the racket
Implementation Method 2
a 3-axis gyroscope for measuring rotational and angular motion during a stroke
Implementation Method 3
a pressure sensor for measuring pressure exerted on strings of the racket and hand of a user while making the swing
Data Source
AI summary
The present invention relates to a system and method of processing sensor data for users to learn about their tennis game, wherein a sensor chip is embedded in a tennis racket shaft/frame and transmits sensor data to a software application installed in an electronic device. In one embodiment, a sensor chip includes 3-axis accelerometer, a 3-axis gyroscope, and a pressure sensor to collect sensor data and a wireless transmitter wirelessly transmits the sensor data to the performance tracking software application. The application processes the data and generates graphical and textual representations of at least swing speed, swing type, and stroke number (i.e., count). In some embodiments, comparison with threshold data is performed and recommendations and/or training plans are generated.