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Encyclopedia > Dolby Laboratories
Dolby logo

Dolby Laboratories, Inc. (Dolby Labs) (NYSE: DLB) is a company specializing in audio compression and reproduction. Image File history File links File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... New York Stock Exchange (June 2003) The New York Stock Exchange (NYSE) , also nicknamed the Big Board, is by far the largest stock exchange in the world (by dollar volume) and second largest by number of listings. ... A schematic representation of hearing. ... Audio compression is a form of data compression designed to reduce the size of audio data files. ... Sound reproduction is the electrical or mechanical re-creation and/or amplification of sound, often as music. ...

Contents


History

Dolby Labs was founded by Ray Dolby in England in 1965. He moved the company to the United States in 1976. The first product he made was Type A Dolby Noise Reduction, a simple compander. One of the features that set Dolby's compander apart was that it treated only the quiet sounds that would be masked by tape noise. Dolby marketed the product to record companies. ` Dolby (left) is inducted into the NIHF Ray Dolby (born January 18, 1933) is the American inventor of the noise reduction system known as Dolby NR. He is the founder and chairman of Dolby Laboratories, and a billionaire. ... Royal motto (French): Dieu et mon droit (Translated: God and my right) Englands location (dark green) within the British Isles Languages None official English de facto Capital None official London de facto Largest city London Area – Total Ranked 1st UK 130,395 km² Population – Total (mid-2004) – Total (2001... 1965 (MCMLXV) was a common year starting on Friday (the link is to a full 1965 calendar). ... 1976 (MCMLXXVI) was a leap year starting on Thursday (the link is to a full 1976 calendar). ... Dolby NR is a noise reduction system developed by Dolby Laboratories for use in analogue magnetic tape recording. ... A waveform before and after the compression stage of companding In telecommunication, signal processing, and thermodynamics, companding (occasionally called compansion) is a method of reducing the effects of a channel with limited dynamic range. ...


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 B-type in 1968. Henry Kloss (1929, Altoona, PA–January 31, 2002, Cambridge, MA) was a prominent audio engineer and businessman who helped advance hi-fi loudspeaker and radio receiver technology beginning in the 1950s until the time of his death. ... KLH is an audio company founded in 1957 by Henry Kloss, Malcolm Lowe, and J. Anton Hoffman. ... 1968 (MCMLXVIII) was a leap year starting on Monday (the link is to a full 1968 calendar). ...


Dolby did not manufacture consumer products outright; it licensed the technologies to consumer electronics manufacturers. It has been suggested that Licensing (strategic alliance) be merged into this article or section. ... Consumer electronics is electronic equipment intended for use by everyday people. ...


Dolby also sought to improve film sound. As the corporation's history explains,

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), which used Dolby noise reduction on all pre-mixes and masters, but a conventional optical sound track on release prints. Callan (1974) was the first film with a Dolby-encoded optical soundtrack. 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). In less than ten years, 6000 cinemas worldwide were equipped to use Dolby sound. Dolby reworked the system slightly for home use and introduced Dolby Surround and Dolby Pro Logic. Clockwork Orange, see Clockwork Orange (disambiguation). ... 1975 (MCMLXXV) was a common year starting on Wednesday (the link is to a full 1975 calendar). ... Sign for Dolby Stereo Dolby Stereo (or Dolby Analog) was the original analog optical technology developed by Dolby Laboratories for 35 mm prints in 1976. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...


Dolby developed a digital surround sound compression scheme for the cinema. Dolby Stereo Digital (now simply called Dolby Digital) was first featured on the 1992 film Batman Returns. Introduced to the home theater market as Dolby AC-3 with the 1995 laserdisc release of Clear and Present Danger, the format didn't become widespread in the consumer market, partly because of extra hardware that was necessary to make use of it, until it was adopted as part of the DVD specification. Dolby Digital is now found in the HDTV (ATSC) standard of the USA, DVD players, and many satellite-TV and cable-TV receivers. Surround sound is the concept of expanding the spatial imaging of audio playback from one dimension (mono/Left-Right) to two or three dimensions. ... Audio compression is a form of data compression designed to reduce the size of audio data files. ... 1992 (MCMXCII) was a leap year starting on Wednesday. ... Batman Returns is both the second Tim Burton Batman movie and the second Batman film starring Michael Keaton as the title character. ... 1995 (MCMXCV) was a common year starting on Sunday of the Gregorian calendar. ... Pioneers LaserDisc Logo Laserdisc certification mark The laserdisc (LD) was the first commercial optical disc storage medium, and was used primarily for the presentation of movies. ... Clear and Present Danger film poster Clear and Present Danger is a 1994 action movie produced by Mace Neufeld and Robert Rehme and directed by Phillip Noyce and based on the novel of the same name by Tom Clancy. ... DVD-R writing/reading side DVD (also known as Digital Versatile Disc or Digital Video Disc) is an optical disc storage media format that can be used for data storage, including movies with high video and sound quality. ... It has been suggested that High Definition Video be merged into this article or section. ... The Advanced Television Systems Committee (ATSC) is the group that helped to develop the new digital television standard for the United States, also adopted by Canada, Mexico, and South Korea and being considered by other countries. ...


On February 17, 2005, the company became public, offering stock for sale on the New York Stock Exchange under the symbol DLB.


On March 15, 2005, Dolby celebrated 40 Years of enhancing entertainment at the ShoWest 2005 Festival in San Francisco.


Technologies

  • Dolby A/B/C/S-Type NR, noise reduction systems for tapes and analog cassettes, see Dolby noise reduction system
  • Dolby Analog SR or simply Dolby SR (Spectral Recording) is a 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 postproduction engineers, broadcasters, and other audio professionals. It is also the benchmark in analog film sound, being included today on nearly all 35 mm 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 Digital (AC-3) delivers digital audio via six discrete channels (referred to as "5.1"). The three front channels (Left/Center/Right) deliver crisp, clean dialogue and accurate placement of on-screen sounds, while twin surround channels (Left Surround/Right Surround) wrap around the audience and immerse them in the action. The LFE (Low-Frequency Effects) channel delivers real impact for explosions and other effects that can, literally, be felt as well as heard. Used in DVDs and cinemas and on digital satellite (DBS), cable, and DTV and HDTV terrestrial services. It can also be used to deliver 5.1 surround radio services.
    • Dolby Digital Surround EX introduces a center rear channel to the 5.1 playback format of Dolby Digital. It is matrixed out of the rear left and right channels, and so does not create true 6.1 sound.
    • Dolby Digital Plus is an audio codec based on and compatible with Dolby Digital, but more advanced. The DVD Forum has selected Dolby Digital Plus as a standard audio format for HD-DVD video. Dolby Digital Plus can also be applied to limited bandwidth environments such as broadcast television.
  • Dolby E is a professional coding system optimized for the distribution of surround and multichannel audio through two-channel postproduction 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 decoded back to baseband audio just prior to the final DTV transmission and then re-encoded into the final audio format specified by the various DTV emission systems.
  • Dolby Headphone is technology that allows for 5.1 surround sound in a standard pair of headphones.
  • Dolby HX Pro Single-ended system used on high-end tape recorders to increase headroom. The recording bias is varied with respect to the high frequency component of the signal being recorded. No coding/decoding is used.
  • Dolby Pro Logic, Dolby Pro Logic II, Dolby Pro Logic IIx
  • Dolby Stereo or simply Dolby Analog is the original analog optical technology developed for 35 mm 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.
  • Dolby TrueHD is Dolby's next generation lossless coding technology. It offers bit-for-bit sound reproduction identical to the studio master. Over seven full-range 24-bit/96kHz discrete channels are supported (plus a LFE channel,making it 7.1 surround) along with the HDMI interface. It has been selected as the mandatory format for HD DVD and as an optional format for Blu-ray Disc. Theoretically, Dolby True HD can support more channels, but this number has been limited to 8 for HD DVD and Blu-Ray.

Tape could refer to any of these : Adhesive tape Sticky tape Gaffer tape Duct tape Masking tape Magnetic tape Cassette tape Punched tape Tape drive Tape measure Tape (movie) This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... Typical 60-minute Compact Cassette. ... Dolby NR is a noise reduction system developed by Dolby Laboratories for use in analogue magnetic tape recording. ... Dolby Analog SR or Dolby SR format (Spectral Recording), was developed by Dolby Laboratories and has been in common use since 1986. ... Dolby Digital is the marketing name for a series of lossy audio compression technologies by Dolby Laboratories. ... DVD-R writing/reading side DVD (also known as Digital Versatile Disc or Digital Video Disc) is an optical disc storage media format that can be used for data storage, including movies with high video and sound quality. ... It has been suggested that High Definition Video be merged into this article or section. ... Dolby Digital Plus, (DD+), was developed specifically for the introduction of HDTV and HD-DVD/Blu-ray discs. ... HD DVD (High Density Digital Versatile Disc or High Definition Digital Video Disc) is a digital optical media format which is being developed as one standard for high-definition DVD. HD DVD is similar to the competing Blu-ray Disc, which also uses the same CD-size (120 mm diameter... Dolby E is a digital audio technology optimized for the distribution of surround and multichannel audio through digital two-channel postproduction and broadcasting infrastructures. ... Tape bias is a high-frequency signal (generally from 40 to 150 kHz) added to the audio signal recorded on an analog tape recorder. ... Dolby Pro Logic is a surround sound processing technology designed to decode soundtracks encoded with Dolby Surround. ... Dolby Pro Logic is a surround sound processing technology designed to decode soundtracks encoded with Dolby Surround. ... Dolby Pro Logic is a surround sound processing technology designed to decode soundtracks encoded with Dolby Surround. ... Sign for Dolby Stereo Dolby Stereo (or Dolby Analog) was the original analog optical technology developed by Dolby Laboratories for 35 mm prints in 1976. ... Dolby TrueHD, from Dolby Laboratories, is an advanced lossless audio codec based on Meridian Lossless Packing. ... LFE is an abbreviation that is commonly used in describing an audio track contained within a 5. ...

See also

The logo represents both the company and its noise reduction system dbx is a noise reduction system for analog tape recording, North American TV broadcasting, and, less commonly, vinyl LPs. ... DTS DTS (formerly known as Digital Theater Systems), owned by DTS Inc (NASDAQ: DTSI), is a multi-channel surround sound format used for both commercial/theatrical and consumer grade applications (with significant technical differences between home and commercial/theatrical variants: the latter being a traditional ADPCM compression system and the... The Dolby Digital vs DTS debate remains a long standing, insoluble debate among home theater enthusiasts and Audiophiles on the internet (via arenas such as usenet groups) and elsewhere. ... Meridian Lossless Packing is a proprietary lossless compression technique for compressing PCM audio data. ... Lossless data compression is a class of data compression algorithms that allows the exact original data to be reconstructed from the compressed data. ...

External links

  • Dolby Labs site
  • History and Info of Dolby Audio
  • Transcripts of Dolby Laboratories, Inc.'s Quarterly Conference Calls


  Results from FactBites:
 
Dolby Laboratories - Wikipedia, the free encyclopedia (1069 words)
Dolby Labs was founded by Ray Dolby in England in 1965.
Dolby E is a professional coding system optimized for the distribution of surround and multichannel audio through two-channel postproduction and broadcasting infrastructures, or for recording surround audio on two audio tracks of conventional digital video tapes, video servers, communication links, switchers, and routers.
Dolby Stereo or simply Dolby Analog is the original analog optical technology developed for 35 mm 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.
"In 70mm and 6-track Dolby Stereo" (990 words)
Dolby┬┤s noise reduction system, known as Type A, was applied to studio recordings of film sound in the early 70s, and subsequently also applied for stereo presentation in cinemas a few years later.
Dolby Digital also is bringing excitement to home listeners via the audio tracks on DVD, and would be the standard audio on the new high definition television (HDTV) system proposed for implementation in the United States if it ever catches on with the public.
Dolby Laboratories' corporate headquarters, housing research and development, marketing, licensing and administrative staff, is located in San Francisco's historic Potrero Hill district, in a renovated brick warehouse dating from the early 1900s.
  More results at FactBites »

 
 

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