Dolby Digital Plus
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| Dolby Digital Plus | |
|---|---|
| Name | Dolby Digital Plus |
| Developer | Dolby Laboratories |
| Released | 2006 |
| Latest release | e.g., E-AC-3 Rev (various updates) |
| Type | Audio codec |
| Container | Dolby Digital, Advanced Audio Coding-related containers, Matroska, MPEG-2 Program Stream, MPEG-2 Transport Stream |
Dolby Digital Plus is a proprietary digital audio compression format developed by Dolby Laboratories as an enhanced successor to Dolby Digital. It provides higher efficiency and greater channel counts for multichannel audio, targeting consumer electronics, broadcasting, streaming, and home theater markets. The format was introduced to meet demands from manufacturers such as Samsung Electronics, Sony Corporation, LG Electronics and content distributors such as Netflix, Amazon (company), and Hulu for improved bandwidth-to-quality tradeoffs.
Overview
Dolby Digital Plus builds on technologies from Dolby Laboratories and related standards work with organizations like Moving Picture Experts Group and European Broadcasting Union to serve platforms including Blu-ray Disc, Ultra HD Blu-ray, Digital Video Broadcasting, and internet streaming services. The codec supports up to 7.1 discrete channels and extensions for object-based workflows promoted by companies such as Dolby Laboratories and standards groups like SMPTE and IEEE. Adoption has involved collaborations with consumer electronics manufacturers such as Panasonic Corporation, Toshiba Corporation, and service providers including DirecTV and Sky UK.
Technical specifications
Dolby Digital Plus uses transform coding and perceptual audio coding techniques related to work by Institute of Electrical and Electronics Engineers researchers and MPEG committees. It operates across a range of bitrates and sampling rates compatible with 48 kHz and other common rates used in production for studios such as Abbey Road Studios and facilities associated with Warner Bros. Entertainment. The codec supports up to 7.1 discrete channels, low-frequency effects (LFE), metadata signaling for dialog normalization and dynamic range control used in workflows by Dolby Laboratories engineers and post-production facilities at Technicolor SA. Profiles and levels define limits for bitrate, channel count, and coupling, aligning with delivery systems from Roku, Inc. streaming devices, Apple Inc. platforms, and professional broadcast chains used by BBC and NBCUniversal.
Encoding and decoding
Encoding tools from vendors including Fraunhofer IIS, NXP Semiconductors, and Dolby provide authoring solutions that integrate with digital audio workstations like Avid Technology and mastering suites used at Skywalker Sound. Decoders are implemented in hardware silicon by vendors such as Intel Corporation, Qualcomm, and Broadcom Inc. and in software libraries used by VLC media player and commercial players from Samsung Electronics and LG Electronics. The format includes signaling within container formats standardized by ISO and interoperability metadata used by broadcasters such as CBS and streaming platforms like YouTube and Spotify where applicable. Dolby also provides reference implementations and conformance test suites for manufacturers such as Microsoft and Sony Interactive Entertainment for integration with platforms like Xbox and PlayStation.
Implementations and compatibility
Dolby Digital Plus is endorsed in consumer device specs by manufacturers including Samsung Electronics, Sony Corporation, LG Electronics, Panasonic Corporation, and media player vendors like Netgear. It is supported in operating systems such as Android (operating system), Windows, and embedded environments used by Raspberry Pi-class vendors through licensed decoder IP from Dolby or third-party silicon partners like ARM Holdings. Broadcast integrations appear in standards work by DVB Project and in cable deployments by Comcast and satellite deployments by Eutelsat and Intelsat. Backward compatibility paths to legacy Dolby Digital (AC-3) and interoperation with immersive audio developments like Dolby Atmos and object-based mixing used in studios such as Technicolor SA and post houses at Sony Pictures Entertainment are common.
Use in consumer and broadcast applications
Consumer applications include home theater receivers from Denon, Yamaha Corporation AVRs, soundbars by Bose Corporation, and TVs from Samsung Electronics and LG Electronics where Dolby Digital Plus enables multichannel audio for streaming apps like Netflix, Amazon Prime Video, and Disney+. Broadcast use spans digital terrestrial systems managed by organizations like Freeview and cable operators such as Virgin Media, with adoption driven by requirements from production houses including BBC Studios and network broadcasters like FOX Broadcasting Company. Live sports and events produced by companies such as Sky Sports and ESPN may use Dolby technologies in contribution and distribution chains to deliver multichannel mixes.
Licensing and formats evolution
Licensing and technical roadmaps are governed by Dolby Laboratories, with patent licensing and certification processes involving corporate partners and standards consortia such as MPEG. The format evolved alongside related Dolby technologies: from Dolby Digital (AC-3) to Enhanced AC-3 and later integrations with object-based formats like Dolby Atmos. Market shifts toward streaming prompted collaborations with platform holders Netflix, Amazon (company), and device makers to enable adaptive bitrate profiles and metadata signaling. The ecosystem includes implementation agreements with chipmakers like Qualcomm and service providers such as Comcast and broadcasters like BBC to ensure interoperability and certification across consumer electronics, broadcast, and streaming industries.