Patent ID: 7398050
Filing Date: 2008-07-08
Classification: H04H

Abstract:
1. A method of communicating data in a satellite digital audio radio (SDAR) system, said method comprising: transmitting two radio frequency digital signals from respective satellites to each of a plurality of SDAR receivers, the two signals including substantially identical information, each of said SDAR receivers being disposed within a respective one of a plurality of motor vehicles, each of the signals including universal data and group-specific data, the universal data being relevant to each of said SDAR receivers, the group-specific data being relevant to less than all of said SDAR receivers, at least one segment of the group-specific data that is relevant to only a corresponding group of said SDAR receivers being in at least one predetermined time location within one of the two signals; providing at least one of the SDAR receivers in the corresponding group with information identifying the at least one predetermined time location; and using said at least one SDAR receiver to: