| 摘要 |
A reaction time measurement system includes a hard-wired or battery-powered accelerometer module attached to a starting block or platform to detect acceleration when a contestant moves. Although the block is grossly stationary, it undergoes slight movement and mechanical vibration, so the accelerometer produces an output signal. A filter or a processing unit in the module processes the output signal to define the reaction time or moment when the athlete starts to leave the block. Preferably the module removably attaches to the starting block by a rigid coupling, and its processor stores and annotates the accelerometer signal. A link or connector signals the reaction time, or the stored signal on request, to a central monitor at which false start detection determinatio n are made and records created. A speaker may be attached to or included in the accelerometer module to receive a starting signal and produce a start sound at the block, so that the starting blocks at all positions emit the start sound simultaneously. The module may be used as an individual training device, in which a runner's readiness and take-off impulse are analysed as a reaction waveform, or his reaction ti me and starting speed recorded. For use in a track system, multiple separately addressed modules each annotate the accelerometer signal trace with one or more externally applied or synchronized timing marks. The processing unit may optionally produce a processed output indicating the interval between start signal and the detected reaction time. Preferably the processor also records the sensed acceleration output signal during the period leading up to and surrounding the start signal, and sends the stored measurement data to the monitoring station on request so that the actual acceleration curve may be visually inspected to verify when a false start determination has been made, and the data may be printed out or otherwise stored for the record. The processor may implement any of several detection rules, and threshold reaction times and/or a blanking interval may be set. Upon identification of a false start, the monitor sends an audible alarm and identifies the offending contestant, as well as displaying the time. Several wired and wireless systems provide actual local simultaneous broadcast of a starting gun sound, the immediate detection of a false start, and the identification and verification of infractions withou t delay.
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