eARC（增强音频回传通道）
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HDMI 2.1功能，通过同一HDMI线缆实现从电视到音响的高码率音频传输。
eARC通过HDMI支持无损Dolby TrueHD、DTS-HD Master Audio和Dolby Atmos，取代了原始ARC的有限带宽。电视和音响之间只需一根HDMI线缆，无需光纤TOSLINK。