A method and device for filtering electromagnetic interference generated by the antenna of a transmitter on a sensor sensitive to electromagnetic waves, characterized in that it includes: vi. elements suitable for sampling the signal received by the sensor, vii. elements for count down the elapsed time, called the detection time, after the sampled signal has exceeded a threshold value, the signal, before exceeding the threshold value, being in a range of standard values, viii. elements for comparing in real time the detection time with a threshold time value, ix. elements suitable for providing a diagnosis of electromagnetic interference to be filtered if the sampled signal reverts to a standard value after a detection time of less than the threshold time value, and a diagnosis of an uninterfered sampled signal if this is not the case, x. elements for generating an output signal from the sensor eliminating the diagnosed electromagnetic interference.