The present invention relates to the areas of communication and/or identification of remote devices (active or passive). The invention has application where there is a need to identify or communicate with more than one remote device. The remote device may be embodied as a transmitter arrangement, transducer,...http://www.google.es/patents/US5485154?utm_source=gb-gplus-sharePatente US5485154 - Communication device and method(s)
