Dolby TrueHD/DTS-HD Master Audio, which are both lossless variable bit-rate codecs, can take the same object-based information instructions (for Atmos or DTS:X respectively) but each requires significantly more bandwidth to do so. When encoded in either version, the stream containing Atmos carries essentially metadata instructions for extracting and placing the location(s) of the sound of objects in relevant positions around the audience.
On top of these object-based audio formats including Dolby Atmos and DTS:X were introduced, bringing over-head height channels and other 3D sound effects to home theaters.ĭolby Atmos can be encoded as part of either a Dolby TrueHD stream or a Dolby Digital+ stream, depending on capacity/bandwidth requirements. The current ARC was designed to pass a maximum of approximately 1 Mbps (it was originally intended to be 384 Kbps), which is just big enough for DD+ but is insufficient to handle newer and more robust lossless surround sound formats that arrived later, including Dolby TrueHD, DTS Master Audio and others. This has stretched the bandwidth limits of the original ARC specification. First, the bandwidth requirements/benefits for streaming audio has gone up, enabling many over-the-top streaming services to move to a more robust Dolby Digital+ codec for online streaming. Since the release of HDMI v.1.4, ARC was made available over one channel, and a number of advancements have occurred that have caught up to and surpassed the initial capabilities of the specification.
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Part of the confusion surrounding some of these high-quality surround sound implementations concerns compatibility with external soundbars, AV receivers, stand-alone decoders and other devices that need to receive the signal from the TV over the HDMI Audio Return Channel (ARC) connection. One of the more common questions we are asked by readers concerns LG’s implementation of Dolby Atmos, Digital Digital+ and Dolby TrueHD surround sound decoding in select LG premium 4K OLED and, more recently, Super UHD LED LCD TVs.
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