Videocon DDB DLX, Service Manual

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Audio Return Channel (ARC) is a very practical feature that has
been introduced in HDMI ver1.4 and later versions. If both a home
theatre receiver and a TV have HDMI ver1.4 or later version
connections, and offer this feature. With ARC you can transfer
audio from the TV back to a home theatre receiver and listen to
your TV's audio through your home theatre audio system instead
of the TV's speakers without having to connect a second cable
between the TV and home theatre system.
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Audio Return Channel (ARC)