Patent ID: 7738838
Filing Date: 2010-06-15
Classification: G06K,H04L

Abstract:
1. A communication method for a noncontact RF ID system comprising: communicating a data sequence having a first waveform which corresponds to one of codes “0” or “1” and which has a length of time T; communicating a data sequence having a second waveform which corresponds to the other of said codes “0” or “1” and which has a length of time T; communicating a data sequence having a third waveform which corresponds to m (m is a natural number equal to or greater than 2) codes that are the same as the codes of the second waveform and where the third waveform has a length of time mT, wherein replacing consecutive instances of the second waveform in the data sequence with the third waveform when the second waveform occurs consecutively in the data sequence, where the data sequence is communicated from a transmitting device to a receiving device.