Physical Transport For Consumer Devices
IEC 61937-3: Defines how to transmit Dolby Digital (AC-3) and Dolby Digital Plus (E-AC-3) bitstreams via an IEC 60958/61937 (S/PDIF) interface.
Dolby Digital Plus is transmitted across HDMI according to IEC 61937-3
As of 2007, HDMI 1.3 is the only means to transport a raw DD+ bitstream between two pieces of consumer equipment. The older and more widespread S/PDIF interface cannot directly transport DD+ bitstreams. A number of methods of transcoding exist to convert an E-AC-3 bitstream into a S/PDIF compatible bitstream.
Read more about this topic: Dolby Digital Plus
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