Stand-alone or audio/video-related data transmitted with no strong timing requirements in the sense that it is not associated with any transmitted clock references and availability of data in a data receiver is not governed by any such clock references.
Source: 90, 94
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Advanced Television Systems Committee, Inc.
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The Advanced Television Systems Committee, Inc., is an international, non-profit organization developing voluntary standards and recommended practices for digital terrestrial broadcasting. ATSC member organizations represent the broadcast, broadcast equipment, motion picture, consumer electronics, computer, cable, satellite, and semiconductor industries. ATSC also develops digital terrestrial broadcasting implementation strategies and supports educational activities on ATSC standards.