Since version 1.4, arc audio return channel has been a part of HDMI standard. Arc has its limitations, its limited 1Mbps bandwidth limits the quality of the audio sent through the return channel, so that high-quality uncompressed audio can not be sent to the receiver; moreover, only dual channel PCM, or traditional Dolby Digital, or DTS audio is allowed to transmit on arc, and the introduction of earc solves these problems.<br>
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