Circuit arrangement method for obtaining an output signal, and rotational speed measurement device comprising such a circuit arrangement

Abstract

A circuit arrangement for obtaining an output signal (Va) form a signal (Vs) containing at least one alternating component comprises a signal source () that supplies this signal (Vs), a first peak value detection device () for determining a maximum value (Vmax) of the signal (Vs), a second peak value detection device () for determining a minimum value (Vmin) of the signal (Vs), a first signal linking device () for obtaining a first resulting signal (V) by additive linking of the signal (Vs), the maximum value (Vmax) and the minimum value (Vmin) in accordance with the rule: V=K*{Vs−(Vmax+Vmin)/2}, in which Kis a freely selectable first constant factor, a second signal linking device () for obtaining a second resulting signal (V) by additive linking of the maximum value (Vmax) and a minimum value (Vmin) in accordance with the rule: V=(Vmax−Vmin)*K, in which Kis a freely selectable second factor, a first squaring device () for squaring the first resulting signal (V), a second squaring device () for squaring the second resulting signal (V) and a third signal linking device () for obtaining the output signal (Va) by additive linking of the squared first resulting signal ((V)) and the squared second resulting signal ((V)) in accordance with the rule: Va=K*{(⅛)*(K/K)*(V)−(V)}, in which Kis a freely selectable third constant factor. By means of the invention, which furthermore includes a rotational speed measurement device comprising such a circuit arrangement and also a method of obtaining an output signal, an unchanged or increased resolution of the output signal can be achieved from the signal containing an alternating component having a restricted resolution.