Concepts For A Digital Radio Signal

Abstract: A digital radio signal comprising a first channel for carrying side information, and a second channel for carrying content information, comprises, in the first channel, an alarm status indication, which indicates whether an alarm announcement is active or inactive. A further, digital radio signal comprises content information, and a target group information, which indicates a geographical region for which the content information is dedicated, wherein the target group information is indicative of at least three geographical positions forming a polygon to indicate the geographical region, wherein the at least three geographical positions are coded into the digital radio signal using differential coding.

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