Method and apparatus for providing an indication of movement, particularly for recognition of blocking in a locking system

A method for providing an indication of movement from a sensor signal from a position transmitter (9), the indication of movement indicating a speed, the sensor signal from the position transmitter (9) generating a plurality of edges, the plurality of edges being alternating rising edges and falling edges, each rising or falling of the plurality of edges generated following a movement over a particular travel range, the method comprising:

• determining (S1) a pulse duration (dT) as an interval of time between a most recent two edges of the plurality of edges of the sensor signal;
• providing (S4, S6) an indication based on of the pulse duration (dT) or an indication based on a time period since a last edge of the plurality of edges, when a time period corresponding to the pulse duration (dT) has elapsed since the most recent edge of the sensor signal;
• wherein the indication of movement is determined as a ratio between the particular travel range and the pulse duration (dT) or as the ratio between the particular travel range and a time period elapsed since the last edge of the plurality of edges, and wherein the interval of time is shorter than an interval of time between the plurality of edges at a predefined maximum speed of movement.