ARC: Audio return channelĪs the name suggests, Audio Return Channel - which gives us the “ARC” in HDMI ARC/eARC - adds the ability for a TV to send audio backward along an HDMI cable to its source device. It wasn’t until a later revision of the HDMI standard (HDMI 1.4) that this began to change. The only exception to this was HDMI Consumer Electronics Control (CEC) - a very low-bandwidth set of commands that could be sent in both directions along an HDMI cable so that a TV’s remote could control an AV receiver’s volume or the power button on an AV receiver’s remote could turn off a TV. Audio and video traveled from a source device to a TV (or projector) and never the other way around. When it was introduced, that digital superhighway was limited to a single direction of flow. Everything you need to know about HDMI 2.1īefore we get into HDMI ARC/eARC, let’s quickly recap what an HDMI connection does: It can send digital video and audio from one device to another using a single cable.Let’s start with some important HDMI basics. So we’re a closer look at what ARC is, how it works, and what the upgraded version, known as “eARC,” offers. While ARC capabilities are common on at least one HDMI port on devices like TVs and soundbars, not everyone is using this advanced standard to improve their entertainment setup.
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