![]() Dolby AC-4 has two different channel based encoding tools with Advanced Joint Channel Coding (A-JCC) used for low bit rates and Advanced Coupling (A-CPL) used for high bit rates. Side signals may also contain audio objects. Additional audio channels may be encoded as side signals which Dolby AC-4 decoders can optionally support which would allow for the delivery of 7.1.4 channel audio. Technical detailsÄolby AC-4 can have up to 5.1 core audio channels which all Dolby AC-4 decoders are required to decode. ![]() On April 14, 2016, Dolby Laboratories announced that Samsung would ship TVs with support for Dolby AC-4 in 2017. On July 14, 2015, Dolby Laboratories announced that Sony Visual Products and Vizio would support Dolby AC-4. On March 10, 2015, the Advanced Television Systems Committee (ATSC) announced that Dolby AC-4 was one of the three standards proposed for the audio system of ATSC 3.0. Its development started in late 2011 to create a high-quality audio format that had a certain resemblance to Dolby TrueHD destined for multiple uses, to be used in streaming services, future TV broadcasts, and mainly to replace the traditional Dolby AC-3, and in December 2014 Dolby Laboratories approved the sound format for commercial use.
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