- ULTRA SURROUND VS DOLBY DIGITAL PLUS FULL
- ULTRA SURROUND VS DOLBY DIGITAL PLUS PLUS
- ULTRA SURROUND VS DOLBY DIGITAL PLUS PROFESSIONAL
A 16-bit sync word, which has the value 0x0b77.
ULTRA SURROUND VS DOLBY DIGITAL PLUS PLUS
A syncframe consists of the following syntax elements (some of which may be elided when a Dolby Digital Plus service is encapsulated into another format or transport): Each syncframe is independently decodable, and belongs to a specific substream within the service. (The 1536-sample case is the most common case, and corresponds to Dolby Digital the shorter subframe lengths are intended for use in interactive applications like video games where reducing encoder latency is an important concern). As many syntax elements are optional or variable-length, including some whose presence or length is dependent on complex preceding calculations, and there is little redundancy in the syntax, DD+ can be extremely difficult to parse correctly, with syntactically valid but incorrect parsings easily produced by defective encoders.Ī DD+ stream is a collection of fixed-length syncframe packets, each of which corresponds to either 256, 512, 768, or 1536 consecutive time-domain audio samples. Its content is mixed in with the other channels in a fashion prescribed by the metadata, it is not reproduced as a discrete channel by the decoder.ĭolby Digital Plus includes comprehensive bitstream metadata for decoder control over output loudness (via dialnorm), downmixing, and reversible dynamic range control (via DRC).ĭolby Digital Plus is nominally a 16-bit-aligned protocol, though very few fields in the syntax respect any byte or word boundaries. The coupling channel is used for medium-to-high-frequency information which is common to multiple full-bandwidth channels. Within each substream, provision is made for encoding five full-bandwidth channels, one low-frequency channel, and one coupling channel. Dependent substreams may be provided for programs that have additional soundstage channels beyond 5.1. Additional independent substreams may be used for secondary audio programs such as foreign language soundtracks, commentary, or descriptions/voiceovers for the visually impaired. Metadata in the substream describes the purpose of each included channel.Īll DD+ streams must contain at least one independent substream or legacy substream, which contains the first (or only) 5.1 channels of the primary audio program.
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As dependent substreams have the same structure as independent substreams, each dependent substream may contain up to five full-bandwidth channels and one low-frequency channel however these channels may be assigned to different speaker placements.
ULTRA SURROUND VS DOLBY DIGITAL PLUS FULL
from mono to 15 full range channels and a low frequency effects channel) Technical details Specifications ĭolby Digital Plus is capable of the following:
ULTRA SURROUND VS DOLBY DIGITAL PLUS PROFESSIONAL
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2.1 Physical transport for consumer devices.2 Encapsulation, use, and storage of Dolby Digital streams.1.5 Relation to Dolby Digital and Dolby Atmos.1.4.1 Modified discrete cosine transform.1.3.1 Storage of transform coefficients.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 V1.2.1 (2008–08), published by the Advanced Television Systems Committee.
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While 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. It is a successor to Dolby Digital (AC-3), also developed by Dolby, and has a number of improvements including support for a wider range of data rates (32 kbit/s to 6144 kbit/s), increased channel count and multi-program support (via substreams), and additional tools (algorithms) for representing compressed data and counteracting artifacts. Dolby Digital Plus, also known as Enhanced AC-3 (and commonly abbreviated as DD+ or E-AC-3, or EC-3) is a digital audio compression scheme developed by Dolby Labs for transport and storage of multi-channel digital audio.