| 摘要 |
An acoustic signalling device, especially a time-counter for sports training by intervals with a signal-producing system (3) which is controlled by a time-counting unit (1), and can be activated in order to produce a number of noise pulses which are staggered at predetermined intervals. Different noise pulses can be produced by the signal-producing system (4) and the signal-producing system (3) is controlled by the time-counter (1) in such a way that the different noise pulses are mutually staggered in time, cyclically repeating at predetermined intervals which can be set independently of one another on a setting system (13, 14) of the time-counting unit (1). |
