ARC and eARC — Audio Return Channel
ARC and eARC carry audio from a display back to an audio device over the HDMI cable — eliminating a separate audio cable from the display to the DSP or amplifier.
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HDR — High Dynamic Range
HDR extends the brightness and color range of video signals beyond standard dynamic range, enabling displays to show specular highlights and deep shadows simultaneously — relevant for 4K content delivery and display specification in AV.
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RS-232 — Serial Control Interface
RS-232 is the most common wired control interface in AV — used to control displays, projectors, PTZ cameras, and DSPs from control processors via simple ASCII or binary command strings.
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