Patent ID: 7411530

Claim:
A method for an evaluation of a first analog signal and a second analog signal, comprising: providing the analog signals substantially sinusoidal and out of phase by about 90° relative to each other when an element moves in a temporally uniform manner relative to a stationary element; recording the first analog signal by first sensor unit; recording the second analog signal by second sensor unit; sending the first analog signal and the second analog signal unit to an AD converter; digitalizing the analog signals by the AD converters at a scanning frequency, wherein the scanning frequency of the AD converters is more than twice as large as a maximum frequency; sending a corresponding digital signal to an evaluation block that is configured as a hardware circuit; determining an arc tangent corresponding to the digital signals in real time by the evaluation block; determining correction values for the first and second signal corresponding to the digital signals in real time by the evaluation block; sending the digital signals to a computing block within the evaluation block; and calculating the arc tangent in real time, wherein a correction-value add-on block that is configured as a hardware circuit is arranged between the AD converters and the evaluation block, the evaluation block feeds the correction values to the correction-value add-on block and the correction-value add-on block corrects the digital signals by the correction values and outputs the corrected digital signals to the evaluation block.