 | |
| MIME / IANA | audio/eac3 |
|---|---|
| Created by | Dolby Laboratories |
| Encoding formats | E-AC3 |
Dolby Digital Plus, also known as Enhanced AC-3 (and commonly abbreviated as DDP, DD+, E-AC-3 or EC-3), is a digital audio compression scheme developed by Dolby Labs for the transport and storage of multi-channel digital audio. It is a successor to Dolby Digital (AC-3), and has a number of improvements over that codec, including support for a wider range of data rates (32 kbit/s to 6144 kbit/s), an increased channel count, and multi-program support (via substreams), as well as additional tools (algorithms) for representing compressed data and counteracting artifacts. Whereas Dolby Digital (AC-3) supports up to five full-bandwidth audio channels at a maximum bitrate of 640 kbit/s, E-AC-3 supports up to 15 full-bandwidth audio channels at a maximum bitrate of 6.144 Mbit/s.
The full set of technical specifications for E-AC-3 (and AC-3) are standardized and published in Annex E of ATSC A/52:2012, as well as Annex E of ETSI TS 102 366.
Technical details
Specifications
Dolby Digital Plus is capable of the following:
- Coded bitrate: 0.032 to 6.144 Mbit/s
- Audio channels: 1.0 to 15.1 (i.e. from mono to 15 full range channels and a low frequency effects channel)
- Number of audio programs per bitstream: 8
- Sample rate: 32, 44.1 or 48 kHz
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