Method and apparatus for converting a displacement of a magnetic object into a directly perceptible signal, instrument incorporating this apparatus

An apparatus for converting a movement of a magnetic object relative to a magnetic field sensor into a signal directly perceptible to a human being, the apparatus comprising:

• a sensor capable of measuring one component of a magnetic field modified as a result of movement of the magnetic object, a computer capable of acquiring a temporal succession of measurements of the one component of the magnetic field during a sliding time window of predetermined duration, building, from the acquired temporal succession of measurements of the one component of the magnetic field, a first set of several signals, the first set of several signals representing a characteristic of the measured one component of the magnetic field that is based on a corresponding characteristic of the movement of the magnetic object, and setting several parameters of the directly perceptible signal based on the first set of several signals to render the characteristics directly perceptible.