Dolby Digital Plus bitstreams are not backward compatible with legacy Dolby Digital decoders. However, all players capable of outputting Dolby Digital Plus over SPDIF are required to be able to transform the decoded-audio into a backwards compatible AC-3 signal 0.640 Mbit/s, for compatibility with legacy Dolby Digital equipment
Generally, a Dolby Digital Plus bitstream can only be transported over an HDMI 1.3 or greater link. Older receivers support earlier versions of HDMI, or only have support for the S/PDIF system for digital audio, or analog inputs.
For non-HDMI 1.3 links, the player can decode the audio and then transmit it via a variety of different methods.
* Earlier versions of HDMI, such as HDMI 1.1, support PCM audio, where the player decodes the audio and transmits it losslessly as PCM over HDMI to the receiver.
* Some receivers and players support analog surround sound, and the player can decode the audio, and transmit it to the receiver as analog audio.
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