English to French Tech/Engineering Electronics / Elect Eng (in a patent) A mapping system for mapping a venue

a sensor unit (106) with a receiver coil, the sensor unit (106) being mobile for moving on a site, which is the venue, the sensor unit (106) being configured to receive a magnetic audio frequency transmission from the site (100) to be mapped and a magnetic audio frequency disturbance on the basis of interaction of the receiver coil with magnetic field and positioning data with respect to the site (100) to be mapped;

The processing unit 116 determines parameter values of at least one parameter of the audio frequency signal which is based on the magnetic transmission. The magnetic transmission may comprise the test signal and/or disturbance.

The magnetic disturbance may come from wires of the electric network i.e. from the mains. The frequency of the disturbance is typically 50 Hz which is an audio frequency because that is a typical frequency of the electric network.
However, the frequency may be different such as 60 Hz, for example. The disturbance may be caused by stray earth currents


The local database 110 may be a memory o f the sensor unit 106. Alternatively, the local database 110 may be a memory separate from the sensor unit 106 and the sensor unit 106 may transmit the detected audio frequency signal to the local database 110 wirelessly or via a wire.

j'ai aussi dans le meme contexte: magnetic audio frequency disturbance