METHOD OF REPRODUCING A STANDARD TENNIS BALL THROW-IN WHEN SERVING AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2019 - IPC G01P15/08 

FIELD: measuring equipment.

SUBSTANCE: this device relates to measurement equipment and is intended for development of a serve element in tennis. Technical effect is achieved due to the fact that on the free hand throwing the ball, an acceleration sensor is installed, where the sensor output is connected to the spectrum analyzer input, equipped with the adjustable band-pass filter using the replaceable RC-circuits, at that, the toggle series is followed after the next tosses (followed by racquet strikes on the ball, recognized as non-scoring, taken as reference) fixation of accelerations of the ball throwing ball with a voltmeter connected to the output of the spectro-analyzer, with subsequent change of band-pass filters with central frequencies, and so on until such band-pass filter with central frequency is detected, at which acceleration of ball throwing ball will have maximum value.

EFFECT: enabling the measurement device maximum resolution to reproduce the ball standard throw-in.

2 cl, 1 dwg