Dolby Labs was founded by Ray Dolby (1933–2013) in London, England, in 1965.[5] In the same year, he invented the Dolby Noise Reduction system, a form of audio signal processing for reducing the background hissing sound on cassette tape recordings.[6] His first U.S. patent on the technology was filed in 1969, four years later. The method was first used by Decca Records in the UK.[7] After this, other companies began purchasing Dolby’s A301 technology, which was the professional noise reduction system used in recording, motion picture, broadcasting stations and communications networks.[8] These companies include BBC, Pye, IBC, CBS Studios, RCA, and Granada.[9]
He moved the company headquarters to the United States (San Francisco, California) in 1976.[10] The first product Dolby Labs produced was the Dolby 301 unit which incorporated Type A Dolby Noise Reduction, a compander-based noise reduction system.[9] These units were intended for use in professional recording studios.
Dolby was persuaded by Henry Kloss of KLH to manufacture a consumer version of his noise reduction. Dolby worked more on companding systems and introduced Type B in 1968.
Dolby also sought to improve film sound. As the corporation's history explains:[citation needed]
Upon investigation, Dolby found that many of the limitations in optical sound stemmed directly from its significantly high background noise. To filter this noise, the high-frequency response of theatre playback systems was deliberately curtailed… To make matters worse, to increase dialogue intelligibility over such systems, sound mixers were recording soundtracks with so much high-frequency pre-emphasis that high distortion resulted.
The first film with Dolby sound was A Clockwork Orange (1971). The company was approached by Stanley Kubrick, who wanted to use Dolby’s noise reduction system to facilitate the film’s extensive mixing.[11] The film went on to use Dolby noise reduction on all pre-mixes and masters, but a conventional optical soundtrack on release prints. Callan (1974) was the first film with a Dolby-encoded optical soundtrack.[12] In 1975, Dolby released Dolby Stereo, which included a noise reduction system in addition to more audio channels (Dolby Stereo could actually contain additional center and surround channels matrixed from the left and right). The first film with a Dolby-encoded stereo optical soundtrack was Lisztomania (1975), although this only used an LCR (Left-Center-Right) encoding technique. The first true LCRS (Left-Center-Right-Surround) soundtrack was encoded on the movie A Star Is Born in 1976. In less than ten years, 6,000 cinemas worldwide were equipped to use Dolby Stereo sound. Dolby reworked the system slightly for home use and introduced Dolby Surround, which only extracted a surround channel, and the more impressive Dolby Pro Logic, which was the domestic equivalent of the theatrical Dolby Stereo.[13]
On June 18, 2010, Dolby introduced Dolby Surround 7.1, and set up theaters worldwide with 7.1 surround speaker setups to deliver theatrical 7.1 surround sound. The first film to be released with this format was Pixar's Toy Story 3 which was later followed by fifty releases using the format. About 80% of films released are now mixed in Dolby Surround 7.1 by default.
In April 2012, Dolby introduced its Dolby Atmos, a new cinematic technology adding overhead sound, first applied in Pixar's motion picture Brave.[15] In July 2014, Dolby Laboratories announced plans to bring Atmos to home theater. The first television show to use the technology on disc was Game of Thrones.
On February 24, 2014, Dolby acquired Doremi Labs for $92.5 million in cash plus an additional $20 million in contingent consideration that may be earned over a four-year period.[16]
In May 2019, Dolby decided to add Dolby Atmos to hundreds of newer songs in the music industry.[17]
In May 2020, Dolby launched a developer platform, Dolby.io, aimed at providing developers self-service access to Dolby technologies through public APIs. It allows any person, organization, small and big, to integrate in their websites, apps, games, etc. features such as media enhancements and transcoding, spatial audio, high-quality video communication and low-latency streaming.[18]
Dolby NR/B/C/S: consumer noise reduction systems for tapes and analog cassettes.
Dolby SR (Spectral Recording): professional four-channel noise reduction system in use since 1986, which improves the dynamic range of analog recordings and transmissions by as much as 25 dB. Dolby SR is utilized by recording and post-production engineers, broadcasters, and other audio professionals. It is also the benchmark in analog film sound, being included today on nearly all 35mm film prints. On films with digital soundtracks, the SR track is used in cinemas not equipped for digital playback, and it serves as a backup in case of problems with the digital track.
Dolby FM: noise reduction system for FM broadcast radio. Dolby FM was tried by a few radio stations starting with WFMT in 1971. It used Dolby B, combined with 25 microsecond pre-emphasis. A small number of models of tuners and receivers were offered with the necessary decoder built in. In addition, a few cassette deck models appeared that allowed the deck's internal Dolby B decoder to be put in the line levelpass-through path, permitting its use with Dolby FM broadcasts. The system was not successful and was on the decline by 1974.
Dolby HX Pro: single-ended system used on high-end tape recorders to increase headroom. The recording bias is lowered as the high-frequency component of the signal being recorded increases, and vice versa. It does nothing to the actual audio that is being recorded, and it does not require a special decoder. Any HX Pro recorded tape will have, in theory, better sound on any deck.
Dolby Advanced Audio: Dolby surround sound, locking preferred volume level, optimizes audio performance for specific PC models and lets turning up the volume to the built-in speakers without distorting the sound.[19]
Dolby Digital EX: introduces a matrix-encoded center rear surround channel to Dolby Digital for 6.1 channel output.[20] This center-rear channel is often split to two rear back speakers for 7.1 channel output.
Dolby Digital Plus (also known as E-AC-3) is a lossy audio codec based on Dolby Digital that is backward compatible, but more advanced. The DVD Forum has selected Dolby Digital Plus as a standard audio format for HD DVD video. It supports data rates up to 6Mbit/s, an increase from Dolby Digital's 640kbit/s maximum. On Blu-ray, Dolby Digital Plus is implemented differently, as a legacy 640kbit/s Dolby Digital stream plus an additional stream to expand the surround sound, with a total bandwidth of approximately 1.7Mbit/s. Dolby Digital Plus is also optimized for limited data-rate environments such as Digital broadcasting.
Dolby Digital Live is a real-time hardware encoding technology for interactive media such as video games. It converts any audio signals on a PC or game console into the 5.1-channel Dolby Digital format and transports it via a single S/PDIF cable.[21] A similar technology known as DTS Connect is available from competitor DTS.
Dolby E selected hardwareDolby E: professional coding system optimized for the distribution of surround and multichannel audio through digital two-channel post-production and broadcasting infrastructures, or for recording surround audio on two audio tracks of conventional digital video tapes, video servers, communication links, switchers, and routers. The Dolby E signal does not reach viewers at home. It is transcoded to Dolby Digital at a lower data rate for final DTV transmission.
Dolby Stereo (also known as Stereo A): original analog optical technology developed for 35mm prints and is encoded with four sound channels: Left/Center/Right (which are located behind the screen) and Surround (which is heard over speakers on the sides and rear of the theatre) for ambient sound and special effects. This technology also employs A-type or SR-type noise reduction, listed above with regards to analog cassette tapes. See also Dolby Surround
Dolby TrueHD: Offers bit-for-bit sound reproduction identical to the studio master. Over seven full-range 24-bit/96kHz discrete channels are supported (plus an LFE channel, making it 7.1 surround) along with the HDMI interface. Theoretically, Dolby TrueHD can support more channels, but this number has been limited to 8 for HD DVD and Blu-ray Disc.
Dolby Pulse: released in 2009, it is identical to the HE-AAC v2 codec except for the addition of Dolby metadata, which is common for Dolby's other digital audio codecs. This metadata "ensures consistency of broadcast quality."[22]
Dolby AC-4 is a lossy audio compression format that can contain audio channels and/or audio objects.
Dolby Atmos is a suite of technologies for immersive audio having both horizontal and vertical sound placement, using a combination of channel and object-based mixing and delivery. It was first introduced in cinemas with Brave (2012 film). The first game released with Dolby Atmos audio was Star Wars Battlefront (2015 video game). The means of delivering the channels and objects differ given the technical limitations across different media, and the target platform. Dolby Atmos is not a codec; on the consumer market, pre-recorded Dolby Atmos is delivered as an extension to a Dolby TrueHD, Dolby Digital Plus, or Dolby AC-4 stream.
Dolby Virtual Speaker: simulates 5.1 surround sound in a setup of two standard stereo speakers.[23]
Dolby Surround, Dolby Pro Logic, Dolby Pro Logic II, Dolby Pro Logic IIx, and Dolby Pro Logic IIz: these decoders expand sound to a greater number of channels. All can decode surround sound that has been matrixed into two channels; some can expand surround sound to a greater number of speakers than the original source material. See the referenced articles for more details on each decoder.
Dolby Mobile: A version of Dolby's surround sound technology specifically designed for mobile phones, notably the HTC Desire HD, LG Arena and LG Renoir.
Dolby Audio Plug-in for Android: An API packaged as a Java Library that allows Android Developers to take advantage of Dolby Digital Plus Technology embedded into mobile and tablet devices, notably the Fire HD, Fire HDX, and Samsung Galaxy Tab 3 series.
Dolby Voice: Hardware and software products for enterprise-level web conferencing.[26]
Video processing
Dolby Contrast provides enhanced image contrast to LCD screens with LED backlight units by means of local dimming.[27]
Dolby Vision is a content mastering and delivery format similar to the HDR10 media profile. It supports both high dynamic range (HDR) and wide color gamut (ITU-R Rec. 2020 and 2100) at all stages from content creation and production to transmission and playback. Dolby Vision includes the Perceptual Quantizier (SMPTE ST-2084) electro-optical transfer function and supports displays with up to 10,000-nit maximum brightness (4,000-nit in practice). It also provides up to 8K resolution and color depth of up to 12-bits (backwards compatible with current 8-bit and 10-bit displays).[35] Dolby Vision can encode mastering display colorimetry information using static metadata (SMPTE ST 2086) and dynamic metadata (SMPTE ST 2094-10, Dolby format) for each scene or frame of a video.[36] Examples of Ultra HD (UHD) Dolby Vision are available in TV, monitor, mobile devices and theater. Dolby Vision content can be delivered on Ultra HD Blu-ray discs,[37][38] over conventional broadcasting, OTT, and online streaming media services.[39] Dolby Vision metadata can be carried via HDMI interface versions 1.4b and above.[40] It also supports IPTPQc2 color space, that is similar to ICtCp. Dolby Vision IQ is an update designed to optimize Dolby Vision content according to the brightness of the room.[41]
ICtCp provides an improved color representation that is designed for high dynamic range (HDR) and wide color gamut (WCG).[42] An improved constant luminance is an advantage for color processing operations such as chroma subsampling and gamut mapping where only color information is changed.[42] ICtCp is based on a modification of IPT called ICaCb.[43]
Digital cinema
Dolby Laboratories Screening Rooms in Burbank, California
Cinema use with optical technology. Uses Dolby A for noise reduction. 4:2 encoded for 35mm film and 2:4 decoded back to 4.0 by Dolby Stereo Processor. Discrete Magnetic 6-Track variant for 70mm.
Upmixes non-Encoded Stereo to Surround 5.1. Can also be used to decode Dolby Surround for 5.1 Playback. Consumer Decoders often include specific Movie, Music, or Game modes.
Extension to PLII. Enhancement of either Stereo, Dolby Surround, Dolby Digital 5.1 to 6.1 or 7.1. Decodes Dolby Digital EX to 6.1 or 7.1. Retains Movie, Music, or Game modes in Consumer Products.
Extension to PLIIx. Decodes Stereo, Dolby Surround or Discrete 5.1/6.1/7.1 to 7.1 Height or Full 9.1 with the addition of Front Height Channels. Last Pro Logic Branded Decoder from Dolby.
Dolby reintroduced the Dolby Surround terminology in 2014. The term now refers to a new frequency-domain decoder/upmixer. Dolby Surround is a complete replacement for Pro Logic; it takes in stereo (discrete or matrixed), 5.1 and 7.1 inputs to play over a wide range of output configurations including those with height channels.
Discrete channel encoder/decoder. Stereo output can be generated from the 5 program channels using Pro Logic encoding. This allows systems that are limited to stereo output to carry surround sound.
Lossless compression codec; supports 44.1kHz to 192kHz sampling frequency up to 24-bit word length; supports variable data rate up to 18 Mbit/s; maximum channel support is 16 channels as presently deployed. Higher bitrate than Dolby Digital Plus. Blu-ray Disc channel support up to eight channels of 96kHz/24-bit audio; six channels (5.1) up to 192kHz/24-bit; and two- to six-channel support up to 192kHz/24-bit maximum bit rate up to the maximum of 18 Mbit/s.
Lossy compression codec; 48kHz sampling frequency, 20-bit word length; supports data rates of 32 kbit/s – 6 Mbit/s, scalable, including 768 kbit/s – 1.5 Mbit/s on high-definition optical discs, typically, and 256 kbit/s for broadcast and online. 1.0- to 7.1-channel support for current media applications; extensible to 16 channels; discrete. Backward compatible with Dolby Digital through S/PDIF connection up to 640 kbit/s. Supports Dolby Metadata.
Cinema: SSLAC. Consumer: Dolby Digital Plus-JOC, MLP, AC-4.
2012
Expands on existing surround sound formats by adding top surround channels and audio objects. Each audio object consists of a mono audio signal plus metadata that describes the sound location, size, and other rendering control parameters. An object renderer is used to convert the audio objects to output channel signals. The use of audio objects allows a sound to be described independently of any specific loudspeaker configuration. For cinema distribution, all audio is losslessly encoded as PCM or SSLAC (Samplerate Scalable Lossless Audio Coding).
Cinema soundtrack channels:
L, R, C, LFE, Lss, Rss (side surrounds), Lrs, Rrs (rear surrounds), Lts, Rts (top surrounds). Note: the number and intended location of _output_ channels is defined at playback based on the available loudspeakers.
Dolby Digital, originally synonymous with Dolby AC-3, is the name for a family of audio compression technologies developed by Dolby Laboratories. Called Dolby Stereo Digital until 1995, it is lossy compression. The first use of Dolby Digital was to provide digital sound in cinemas from 35 mm film prints. It has since also been used for TV broadcast, radio broadcast via satellite, digital video streaming, DVDs, Blu-ray discs and game consoles.
Home cinema, also called home theaters or theater rooms, are home entertainment audio-visual systems that seek to reproduce a movie theater experience and mood using consumer electronics-grade video and audio equipment that is set up in a room or backyard of a private home. Some studies show that films are rated better and generate more intense emotions when watched in a movie theater, but convenience is a major appeal for home cinemas. In the 1980s, home cinemas typically consisted of a movie pre-recorded on a LaserDisc or VHS tape; a LaserDisc Player or VCR; and a heavy, bulky large-screen cathode ray tube TV set, although sometimes CRT projectors were used instead. In the 2000s, technological innovations in sound systems, video player equipment and TV screens and video projectors have changed the equipment used in home cinema set-ups and enabled home users to experience a higher-resolution screen image, improved sound quality and components that offer users more options. The development of Internet-based subscription services means that 2020s-era home theatre users do not have to commute to a video rental store as was common in the 1980s and 1990s.
Surround sound is a technique for enriching the fidelity and depth of sound reproduction by using multiple audio channels from speakers that surround the listener. Its first application was in movie theaters. Prior to surround sound, theater sound systems commonly had three screen channels of sound that played from three loudspeakers located in front of the audience. Surround sound adds one or more channels from loudspeakers to the side or behind the listener that are able to create the sensation of sound coming from any horizontal direction around the listener.
Dolby Pro Logic is a surround sound processing technology developed by Dolby Laboratories, designed to decode soundtracks encoded with Dolby Surround. The terms Dolby Stereo and LtRt are also used to describe soundtracks that are encoded using this technique.
Ray Milton Dolby Hon OBE, HonFREng was an American engineer and inventor of the noise reduction system known as Dolby NR. He helped develop the video tape recorder while at Ampex and was the founder of Dolby Laboratories.
Sound-on-film is a class of sound film processes where the sound accompanying a picture is recorded on photographic film, usually, but not always, the same strip of film carrying the picture. Sound-on-film processes can either record an analog sound track or digital sound track, and may record the signal either optically or magnetically. Earlier technologies were sound-on-disc, meaning the film's soundtrack would be on a separate phonograph record.
DTS, Inc. is an American company. DTS company makes multichannel audio technologies for film and video. Based in Calabasas, California, the company introduced its DTS technology in 1993 as a competitor to Dolby Laboratories, incorporating DTS in the film Jurassic Park (1993). The DTS product is used in surround sound formats for both commercial/theatrical and consumer-grade applications. It was known as The Digital Experience until 1995. DTS licenses its technologies to consumer electronics manufacturers.
Dolby Stereo is a sound format made by Dolby Laboratories. It is a unified brand for two completely different basic systems: the Dolby SVA 1976 system used with optical sound tracks on 35mm film, and Dolby Stereo 70mm noise reduction on 6-channel magnetic soundtracks on 70mm prints.
Dolby Digital Plus, also known as Enhanced AC-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, an increased channel count, and multi-program support, 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.
Dolby TrueHD is a lossless, multi-channel audio codec developed by Dolby Laboratories for home video, used principally in Blu-ray Disc and compatible hardware. Dolby TrueHD, along with Dolby Digital Plus (E-AC-3) and Dolby AC-4, is one of the intended successors to the Dolby Digital (AC-3) lossy surround format. Dolby TrueHD competes with DTS's DTS-HD Master Audio, another lossless surround sound codec.
High dynamic range (HDR), also known as wide dynamic range, extended dynamic range, or expanded dynamic range, is a signal with a higher dynamic range than usual.
An audio/video receiver (AVR) is a consumer electronics component used in a home theater. Its purpose is to receive audio and video signals from a number of sources, and to process them and provide power amplifiers to drive loudspeakers and route the video to displays such as a television, monitor or video projector. Inputs may come from a satellite receiver, radio, DVD players, Blu-ray Disc players, VCRs or video game consoles, among others. The AVR source selection and settings such as volume, are typically set by a remote controller.
DTS-HD Master Audio is a multi-channel, lossless audio codec developed by DTS as an extension of the lossy DTS Coherent Acoustics codec. Rather than being an entirely new coding mechanism, DTS-HD MA encodes an audio master in lossy DTS first, then stores a concurrent stream of supplementary data representing whatever the DTS encoder discarded. This gives DTS-HD MA a lossy "core" able to be played back by devices that cannot decode the more complex lossless audio. DTS-HD MA's primary application is audio storage and playback for Blu-ray Disc media; it competes in this respect with Dolby TrueHD, another lossless surround format.
MUSE, commercially known as Hi-Vision was a Japanese analog high-definition television system, with design efforts going back to 1979.
Ultra Stereo is a cinema sound system that was developed in 1984 by chief engineer Jack Cashin.
In sound recording and reproduction, audio mixing is the process of optimizing and combining multitrack recordings into a final mono, stereo or surround sound product. In the process of combining the separate tracks, their relative levels are adjusted and balanced and various processes such as equalization and compression are commonly applied to individual tracks, groups of tracks, and the overall mix. In stereo and surround sound mixing, the placement of the tracks within the stereo field are adjusted and balanced. Audio mixing techniques and approaches vary widely and have a significant influence on the final product.
Dolby Atmos is a surround sound technology developed by Dolby Laboratories. It expands on existing surround sound systems by adding height channels, allowing sounds to be interpreted as three-dimensional objects with neither horizontal nor vertical limitations. Following the release of Atmos for the cinema market, a variety of consumer technologies have been released under the Atmos brand, using in-ceiling and up-firing speakers.
Dolby Vision is a set of technologies developed by Dolby Laboratories for high dynamic range (HDR) video. It covers content creation, distribution, and playback. It includes dynamic metadata that define the aspect ratio and adjust the picture based on a display's capabilities on a per-shot or even per-frame basis, optimizing the presentation.
HDR10 Media Profile, more commonly known as HDR10, is an open high-dynamic-range video (HDR) standard announced on August 27, 2015, by the Consumer Technology Association. It is the most widespread HDR format.
High-dynamic-range television (HDR-TV) is a technology that uses high dynamic range (HDR) to improve the quality of display signals. It is contrasted with the retroactively-named standard dynamic range (SDR). HDR changes the way the luminance and colors of videos and images are represented in the signal, and allows brighter and more detailed highlight representation, darker and more detailed shadows, and more intense colors.
↑ Welch, Rosanne; Lamphier, Peg A. (2019). Technical Innovation in American History: An Encyclopedia of Science and Technology [3 volumes]. Santa Barbara, CA: ABC-CLIO. p.47. ISBN978-1-61069-094-2.
↑ Billboard (1971). Dolby System's Acceptance Builds Insurmountable Lead. New York: Nielsen Business Media, Inc. p.23.
1 2 Mukharji, Aroop (2016). Diplomas and Diplomacy: The History of the Marshall Scholarship. New York: Palgrave Macmillan. p.122. ISBN978-1-137-59428-0.
This page is based on this Wikipedia article Text is available under the CC BY-SA 4.0 license; additional terms may apply. Images, videos and audio are available under their respective licenses.
US$1.25 billion (2022)
