Patent ID: 8229697

Claim:
A method for determining at least one of a rotational direction and a rotational speed of a rotatable body comprising: determining a phase value φ 0 from a sine signal (y 0 ) and a cosine signal (x 0 ), which are assignable to at least one of the rotational direction and the rotational speed, at a point in time; determining phase values φ i from the corresponding sine signals (y i ) and corresponding cosine signals (x i ), which are assignable to the at least one of the rotational direction and the rotational speed, at points in time t i ; calculating by a processor phase differences Δφ i from the phase values φ i and the phase value φ 0 ; and determining by the processor the at least one of the rotational direction and the rotational speed ω from the phase differences Δφ i on the basis of a Vernier method.