| 摘要 |
The method involves recording, during a predetermined sampling period, the highest detected level of perturbation and allocating this to one of a set of stepped classes of amplitude by incrementing a counter 411 corresponding to that class. The apparatus consists of an input stage 100, a range of high-speed comparators 210-270 controlling a self-locking switch 214, a series of EXCLUSIVE OR gates 310-370 selecting the highest level reached and delivering a signal authorising an increment in the associated counter 411. <IMAGE>
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