Object collision point detecting apparatus

A shot training apparatus comprising:

• a) a target screen sheet stretched in a frame;
• b) at least three collision sound detecting devices located on a circumference of said target screen sheet for detecting a sound of a collision of a flying object shot by a player on the target screen sheet;
• c) first calculating means for calculating a collision point of the flying object on the target screen based on detection time points of the detections of the collision sound by said at least three collision sound detecting devices, each of the detection time points being determined by digitizing an analog signal generated by each of the collision sound detecting devices into digital data and by processing the digital data;
• d) shooting time detecting means for detecting a shooting time point when the flying object is shot form a predetermined shooting point;
• and
• e) second calculating means for calculating a travelling time length of flying object from the shooting time point when the flying object is shot from the predetermined shooting point to a time point when the flying object collides against the target screen sheet, based on the detection time points determined by the first calculating means and the shooting time point detected by the shooting time detecting means, and for calculating a trajectory of the flying object until the flying object collides against the target screen sheet and a virtual trajectory after the object collides against the target screen sheet using the travelling time length and the collision point calculated by the first and second calculating means.