Below are the published ATSC standards for ATSC digital television service, issued by the Advanced Television Systems Committee.
In 2004, the main ATSC standard was amended to support Enhanced ATSC (A/112); this transmission mode is backwardly compatible with the original 8-Bit Vestigal Sideband modulation scheme, but provides much better error correction.
ATSC-M/H for mobile TV has been approved and added to some stations, though it is known that it uses MPEG-4 instead of MPEG-2 for encoding, and behaves as an MPEG-4-encoded subchannel, inheriting 8VSB from the remainder of the channel.
ATSC 3.0 is a non-backwards-compatible version of ATSC being developed (as of May 18, 2016) that uses OFDM instead of 8VSB and a much newer video codec (instead of ATSC 1 and 2's MPEG-2). At the time of this article's writing, it has several candidate and one finalized standard.
On March 28, 2016, the Bootstrap component of ATSC 3.0 (System Discovery and Signalling) was upgraded from candidate standard to finalized standard.
On May 4, 2016, the Audio Codec component of ATSC 3.0 was elevated to candidate standard, with two finalists remaining: Dolby AC-4 and MPEG-H Audio Alliance format from Fraunhofer IIS, Qualcomm and Technicolor SA. A third entry from DTS named DTS:X (a successor to DTS-HD) was withdrawn before the standard was upgraded to candidate status.
On September 8, 2016, the Physical Layer Download (OFDM) component of ATSC 3.0 was upgraded from candidate standard to finalized standard.
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