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The algorithm is not directly Backwards Compatible with AC-3 — existing AC-3 decoders will not be able to decode E-AC-3 streams — but Dolby Digital Plus-capable equipment is required to be able to convert E-AC-3 streams to AC-3 for compatibility with existing Dolby Digital A/V processors.


TECHNICAL DETAILS


  • Coded bitrate: 32 to 6144 kbit/s

  • Audio Channels: 13.1

  • Sample rate: 32, 44.1, 48, or 96 kHz

  • Sample depth: up to 24 bits per channel.



PHYSICAL TRANSPORT


As of 2005, HDMI and IEEE-1394 are planned to support a DD+ stream at its maximum defined bitrate.

The older and more widespread SPDIF -interface does not have adequate bandwidth for a full Dolby Digital Plus stream (6144 kbit/s). When a DD+ audio track is output to an SPDIF-interface, it must first be downconverted to a lower datarate within SPDIF's capabilities. This downmix is potentially inferior to the DD+ source-bitstream, but still of superior quality to standard AC-3.