Patent ID: 7792122

Claim:
A processing method for data exchanged between a portable object and an interface device, the portable object being of a chip card or chip key type, wherein the method comprises a protocol detection mode implemented within and by the portable object, comprising: a) receiving an initial signal from the interface device, wherein the initial signal is received after transmission of a response upon turning on the portable object; b) sampling said initial signal simultaneously according to a first speed with a first protocol and a second speed associated with a second protocol in the portable object; c) comparing, in the portable object, at least one sample of a resulting sampling signal to at least one key protocol condition corresponding to one of the first protocol and the second protocol; and d) processing data exchanged according to one of the first protocol and the second protocol based on a result of the comparison in the portable object; wherein an elementary time unit of the first speed is equal to 372/if, where “if” is a frequency provided by the interface device during the response when the portable object is turned on; wherein an elementary time unit of the second speed is equal to 396/if, where “if” is the frequency provided by the interface device during the response when the portable object is turned on.