what is the difference between hdmi arc and earc?

ARC and eARC: The Audio Feature that Enhances Your Home Theater Experience

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what is the difference between hdmi arc and earc?

What Does HDMI ARC Mean? HDMI ARC and eARC: What is the Difference?

8 Steps To Let You Know: HDMI ARC vs Optical

HDMI ARC vs HDMI eARC, The Difference