A sensor system comprising: an acquisition unit comprising an analog to digital converter (ADC) generating a series of digital sensor signals; a first evaluation unit receiving the series of digital sensor signals for evaluation, wherein the first evaluation unit accumulates and decimates the series of digital sensor signals and generates output signals that correspond to a sensor event; a second evaluation unit independent from said first evaluation unit directly receiving the series of digital sensor signals from said analog to digital converter (ADC); wherein at least a first and second series of digital sensor signals of said series of digital sensor signals is processed by the second evaluation unit to generate a control signal that is configured to select a sampling frequency controlling the analog to digital converter, wherein the first and second series of digital sensor signals are sampled at different sampling frequencies, wherein the second evaluation unit comprises a digital filter configured to reject a spectral portion retained by the first evaluation unit , in particular configured to reject a DC component, having an input receiving the series of digital sensor signals and an output providing a signal to generate the control signal, a power estimator configured to determine a power within the retained spectral portion and coupled with an output of the digital filter and with a first and second register (SCORE1, SCORE2) configured to store a first and second score value generated by the power estimator unit and a comparator unit comparing the first and second score value to generate the control signal. an acquisition unit comprising an analog to digital converter (ADC) generating a series of digital sensor signals; a first evaluation unit receiving the series of digital sensor signals for evaluation, wherein the first evaluation unit accumulates and decimates the series of digital sensor signals and generates output signals that correspond to a sensor event; a second evaluation unit independent from said first evaluation unit directly receiving the series of digital sensor signals from said analog to digital converter (ADC); wherein at least a first and second series of digital sensor signals of said series of digital sensor signals is processed by the second evaluation unit to generate a control signal that is configured to select a sampling frequency controlling the analog to digital converter, wherein the first and second series of digital sensor signals are sampled at different sampling frequencies, wherein the second evaluation unit comprises a digital filter configured to reject a spectral portion retained by the first evaluation unit , in particular configured to reject a DC component, having an input receiving the series of digital sensor signals and an output providing a signal to generate the control signal, a power estimator configured to determine a power within the retained spectral portion and coupled with an output of the digital filter and with a first and second register (SCORE1, SCORE2) configured to store a first and second score value generated by the power estimator unit and a comparator unit comparing the first and second score value to generate the control signal. <EOS>