| 摘要 |
The present invention relates to a system for processing a signal (U) fro m an electric device (10), e.g. a touch sensitive key. The system comprises a reference value (Uref) for the signal (U), wherein said reference value (U ref) is continuously updated, and an arithmetic unit for determining a diffe rence value (.DELTA.U) between the signal (U) and the reference value (Uref) , so that difference value (.DELTA.U) corresponds with a change of the signa l (U). The system comprises further a spectrum of the possible difference va lues (.DELTA.U), wherein said spectrum is subdivided into ranges (21, 23, 25 , 27, 29, 31, 33, 35, 37, 39) corresponding with possible causations for the change of the signal (U) in said system. Additionally, the system comprises a comparing unit for associating the difference value (.DELTA.U) with the c orresponding range (21, 23, 25, 27, 29, 31, 33, 35, 37, 39) of the spectrum and for identifying, if the difference value (.DELTA.U) results from a distu rbance or from a relevant change in the electric device (10). Further, the p resent invention relates to a corresponding method.
|
