Synchronization between an object and a reader contactlessly communicating by active load modulation

A method of contactless communication can be performed between an object and a reader using active load modulation. A synchronization process is performed between a first carrier signal transmitted by the reader and having a reference frequency, and a second carrier signal extracted from an output signal of a controlled oscillator of a digital phase-locked loop of the object. In the synchronization process, as long as a locking of the loop has not been detected, the frequency of the output signal of the oscillator is latched on a frequency that is a multiple of the reference frequency. Once the locking has been detected, the latching continues while controlling the oscillator with a second control signal generated from a second value obtained.