Simple ideas for light but robust signal processing of electromechanical systems

After a short overview about the problem of finding simple global indicators for a signal, which can summarize the aspect or the behaviour of the whole signal itself, some highlights are given on two simple ideas to formulate a light algorithm for some kinds of signal processing. On one hand, they can be useful to find global characteristics as end point of the signal processing; on the other hand, they can be used as pre-processing techniques to simplify the job of other processing techniques that can be applied next. An example is given about an algorithm to detect whether a periodical signal has a regular shape, as expected, or with undesired disturbances.