计时在田径运动训练中是一个重要环节,计时数据的误差大小直接影响到对运动员平时能力的判断和对比赛成绩的预测。尤其是短跑,在短跑的平时训练中,不可能经常使用发令枪和烟屏及更先进的电计时设备,其准确的计时更显得尤为重要。在平时的训练中,大多教练员使用了两种信号:光信号和声信号。由于对于信号的掌握尺度的不稳定和信号源的不统一,造成了计时的误差或大或小,从 Timing in track and field training is an important part of the timing data of the size of the error directly affects the ability of athletes to judge and predict the outcome of the game. Sprinters, in particular, can not always use the starting gun and smokescreens and more advanced electrical timing devices in their usual sprint training, and the accurate timing is even more important. In the usual training, most coaches use two kinds of signals: optical signals and acoustic signals. Due to the signal to grasp the scale of the instability and signal source is not uniform, resulting in the timing error is larger or smaller, from