Verfahren zum Übertragen von Daten zwischen einem Terminal und einem tragbaren Datenträger über eine drahtlose elektromagnetische Übertragungsstrecke

摘要

A method for the transmission of data between a terminal and a portable data carrier via a wireless electromagnetic transmission link wherein a carrier signal modulated by 100 % ASK data acts as a timing signal in the data carrier and the significance of data is determined by the shifting position in the carrier signal within a time slot and the information content of a shifting position corresponds to a number of N bits, whereby N is larger than or equal to 2. The significance of these N bits is defined by the shifting position within 2<N> possible positions in a time slot. At the beginning or the end of a time slot there is a zero-time interval, in which there is no occurrence of a shifting point allocated to the data to be transmitted in order to avoid unacceptably long malfunctioning of the carrier signal.