A safety circuit for the multi-channel processing of an input signal. The safety circuit includes an analog-to-digital conversion device having a first analog input and a second analog input and at least one digital output for processing the input signal. Furthermore, the safety circuit has a test device which is set up to apply a test signal at the first and/or second input of the A/D conversion device in such a way that the test signal superposes the input signal such that the test signal dominates the input signal.

A method for determining information regarding the displacement of an object from measurements provided by an accelerometer associated with the object. The method comprises the steps of detecting acceleration peaks in the measurements, of calculating one or more characteristics of the acceleration peaks detected, and of determining a mode of travel of the object from the characteristics of the acceleration peaks. The measurements undergo non-uniform resampling upon the detection of local extrema.

A safety circuit for the multi-channel processing of an input signal. The safety circuit includes an analog-to-digital conversion device having a first analog input and a second analog input and at least one digital output for processing the input signal. Furthermore, the safety circuit has a test device which is set up to apply a test signal at the first and/or second input of the A/D conversion device in such a way that the test signal superposes the input signal such that the test signal dominates the input signal.

A method for determining information regarding the displacement of an object from measurements provided by an accelerometer associated with the object. The method comprises the steps of detecting acceleration peaks in the measurements, of calculating one or more characteristics of the acceleration peaks detected, and of determining a mode of travel of the object from the characteristics of the acceleration peaks. The measurements undergo non-uniform resampling upon the detection of local extrema.