ARC / eARC
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HDMI功能，通过传输视频的同一根HDMI线缆将音频从电视机回传到音响或接收器。
ARC（音频回传通道）支持压缩的Dolby Digital和DTS，最高5.1声道。HDMI 2.1的eARC（增强音频回传通道）增加了对无损编解码器（Dolby TrueHD、DTS-HD MA）和Dolby Atmos的支持。eARC需要超高速HDMI线缆才能提供全带宽。这消除了对单独光纤/同轴音频线缆的需求。