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Topic: Dolby noise reduction

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	"In 70mm and 6-track Dolby Stereo" (Site not responding. Last check: 2007-10-20)
		Dolby conjectured that applying Dolby A-type noise reduction to the optical sound track would make it possible for wider frequency response in the theater on the one hand, and for mixers to record "flatter," less distorted soundtracks on the other.
		Dolby then went on to develop an A-type noise reduction unit specifically for use in movie theaters, which incorporated a special equalizer to widen the response of theater speakers without their having to be replaced.
		As with the original mono format, Dolby noise reduction was used to lower the hissing and popping associated with optical soundtracks, and loudspeaker equalization was provided to adjust the theater sound system to a new, wide-range standard response curve.
	www.in70mm.com /newsletter/2000/62/dolby/2.htm (1149 words)

	Dolby noise reduction system - Wikipedia, the free encyclopedia
		Dolby NR is a noise reduction system developed by Dolby Laboratories for use in analogue magnetic tape recording.
		Dolby's analogue noise reduction systems, though still used in some professional applications, have been made obsolete by the widespread adoption of digital audio (in the form of compact discs, MP3s, MiniDiscs, and to a lesser extent DAT) in the home for entertainment and recording.
		Dolby B (and C which is similar) is a form of dynamic preemphasis.
	en.wikipedia.org /wiki/Dolby_noise_reduction_system (661 words)

	Dolby Laboratories - Wikipedia, the free encyclopedia
		Dolby was persuaded by Henry Kloss of KLH to manufacture a consumer version of his noise reduction.
		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 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.
	en.wikipedia.org /wiki/Dolby (877 words)

	Dolby noise reduction system (Site not responding. Last check: 2007-10-20)
		Dolby has another noise reduction system called HX Pro, which works by modifying the ultrasonic bias signal,used by all analogue tape decks, to increase the headroom for high-frequency audio signals.
		Thebackground hiss of a tape white noise is unnoticeable if it is masked by astronger audio signal, especially at higher frequencies.
		Dolby HX modulates the bias level toallow for the self-biasing effect of high frequencies, thus preventing the signal from entering the saturation region.
	www.therfcc.org /dolby-noise-reduction-system-167474.html (466 words)

	Dolby noise reduction system (Site not responding. Last check: 2007-10-20)
		Gear Noise Short Courses Long-running set of two courses which provide an understanding of the mechanisms of gear noise generation, of methods by which gear noise is measured and predicted, and of techniques employed in gear noise and vibration reduction.
		ATCO Noise Management Canadian acoustics consultants and engineering company providing services for industrial noise reduction, noise management assemblies, acoustic enclosures and a range of silencing products.
		Noise Stop Systems room soundproofing and acoustic insulation for noise reduction and eradication.
	www.serebella.com /encyclopedia/article-Dolby_noise_reduction_system.html (921 words)

	Dolby Digital - Wikipedia, the free encyclopedia
		Dolby Digital is the trademarked marketing name for Dolby Laboratories' 'lossy' AC-3 codec.
		Dolby Digital EX is very similar in practice to Dolby's earlier Pro-Logic format, which utilized Matrix technology to add a center and single rear surround channel to stereo soundtracks.
		Dolby formats, the Digital Surround EX codec adds a sixth and sometimes seventh channel to standard (non-EX) 5.1 channel Dolby Digital soundtracks.
	www.wikipedia.org /wiki/Dolby_Digital (666 words)

	Dolby noise reduction system (Site not responding. Last check: 2007-10-20)
		Dolby NR is based on reducing the dynamic range of the sound during recording and expanding it during playback.
		In this it is similar to other analogue noise reduction systems[?].
		Most widely used is the B type, which allows for acceptable playback on devices without noise reduction; most pre-recorded cassettes available on the market use Dolby B. There is also a system called HX Pro, which operates on a different principle.
	www.eurofreehost.com /do/Dolby_noise_reduction_system.html (335 words)

	DOLBY NR
		Dolby NR is used to reduce the amount of hiss on tapes that you record or play back.
		During playback, Dolby NR reduces the decibel level of the same tones in the high end by 5 to 10 decibels, both the musical high end and the hiss.
		Dolby C is able to cut hiss by 10-20 decibels, but there is a catch: You have to use better quality tape (dropouts sound WORSE using Dolby C, compared to Dolby B), and Dolby C tapes are not as compatible as Dolby B tapes when they are played in non-Dolby tape decks.
	home.netcom.com /~zmoq/pages/dolby.htm (1318 words)

	Dolby noise reduction system - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-10-20)
		Several types of Dolby NR were developed, including A, B, C, S, and SR.
		Most widely used, by consumers, is the B type, which allows for acceptable playback on devices without noise reduction.
		Dolby has another noise reduction system called HX Pro, which works by modifying the ultrasonic bias signal, used by all analogue tape decks, to increase the headroom for high-frequency audio signals.
	encyclopedia.worldsearch.com /dolby_noise_reduction_system.htm (620 words)

	Dolby noise reduction system (Site not responding. Last check: 2007-10-20)
		Dolby has another noise reduction system called Pro which works by modifying the ultrasonic bias signal used by all analogue tape decks increase the headroom for high-frequency audio signals.
		The calibration of the recording and playback is important for faithful cancellation of the processes and is easily upset by poor tapes dirty playback heads or using incorrect levels.
		Dolby HX modulates the bias level allow for the self-biasing effect of high thus preventing the signal from entering the region.
	www.freeglossary.com /Dolby_noise_reduction_system (513 words)

	Noise reduction Summary
		Dolby S works slightly differently from other Dolby systems by reacting to the signal to which it is applied, conforming to the signal's characteristics.
		Noise reduction is the process of removing noise from a signal.
		Noise reduction techniques are conceptually very similar regardless of the signal being processed, however a priori knowledge of the characteristics of an expected signal can mean the implementations of these techniques vary greatly depending on the type of signal.
	www.bookrags.com /Noise_reduction (1345 words)

	Encyclopedia: Dolby Digital (Site not responding. Last check: 2007-10-20)
		Dolby Pro Logic is an analog surround sound system developed by Dolby Laboratories in 1976 for cinema sound systems as Dolby Analog SR.
		Dolby Digital Plus, (DD+), was developed specifically for the introduction of HDTV and HD-DVD/Blu-ray discs.
		Dolby Surround was the earliest consumer version of Dolbys multichannel analog film sound format Dolby Analog SR (Spectral Recording).
	www.nationmaster.com /encyclopedia/Dolby-Digital (1768 words)

	"In 70mm and 6-track Dolby Stereo"
		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.
	www.in70mm.com /newsletter/2000/62/dolby/index.htm (990 words)

	Stereophile: Dolby Joins Inventors Hall of Fame
		On May 1, the founder and chairman of Dolby Laboratories was inducted into the National Inventors Hall of Fame in Akron, Ohio, joining such luminaries as Alexander Graham Bell, the inventor of the telephone, and Thomas Edison, inventor of the light bulb and the phonograph.
		The 71-year-old Dolby was inducted into the Hall of Fame "in recognition of his invention of the Dolby noise reduction system, which electronically reduces the tape hiss and other noise inherent in analog audio tape recording and playback," according to an official press release from Dolby Labs.
		The idea for his noise reduction system came to him in 1963, when he was traveling around India as a technical advisor to a UN mission, making and playing recordings with a big Ampex open-reel recorder.
	stereophile.com /news/050304dolby (878 words)

	Thomas Dolby
		Dolby promoted himself as a kind of mad scientist, an egghead that had successfully harnassed the power of synthesizers and samplers, using them to make catchy pop and light electro-funk.
		Dolby continued to record into the '90s, but by that time, he was strictly a cult act.
		In his late teens, Dolby was hired as a touring sound engineer for a variety of post-punk bands, including the Fall, the Passions and the Members; on these dates, he would use a PA system he had built himself.
	www.80sretromusic.com /biography/d/DolbyThomas.htm (884 words)

	Dolby Laboratories Company Founding - License Consumer Technology
		Dolby undertook the development of a consumer version of his noise reduction system at the urging of Henry Kloss, an American audio pioneer and entrepreneur who at the time was president of KLH Research and Development Corp., a manufacturer of home hi-fi equipment.
		Dolby B-type noise reduction, like A-type NR, is a complementary compression/expansion system, requiring encoding when a recording is made, and decoding when the recording is played back.
		Dolby and his staff undertook an investigation of the then-available cartridge tape formats, and concluded that the Compact Cassette, which enclosed two reels within a cartridge small enough to fit into a shirt pocket, had the greatest potential.
	www.dolby.com /about/who_we_are/history_2.html (994 words)

	THE FLAT EARTH SOCIETY: Thomas Dolby: Reading Room: News and Such (Site not responding. Last check: 2007-10-20)
		Dolby appeared here Wednesday at the National Association of Broadcasters radio show, an annual orgy of industry bigwigs and hopeful vendors hawking their blue-sky products to representatives of radio networks and stations from around the world.
		Dolby was born Thomas Robertson in Cairo, the son of a world-renowned scholar of Greek and Etruscan pottery who is now a Cambridge don.
		Dolby himself does not read music-the mixing process on beatnik.com is essentially the same way he composes music, from his pop songs to his movie scores to the sound effects he designed for Steven Spielberg's L.A. restaurant.
	www.thomasdolby.com /reading/news_washpost.html (1118 words)

	NoiseFilters_info
		Noise is typically not a problem with audio and video reproduction until one wants to play soft music or attain enhanced detail.
		Noise should be minimized when possible, but at sufficiently high S/N ratios (of 80 to 90 dB or so) it is of less importance than at lower levels.
		Noise is an important factor in purchasing an audio/video component and should be taken into account with other criteria to make an informed purchase decision.
	www.mobile-emotions.com /NoiseFilters_info.html?1062642670421 (920 words)

	ＬＥＡＶＥＮＦＲＡＭＥ ™: Dolby
		Dolby's reputation as a leader in audio technology was greatly enhanced in 1986 with the introduction of a powerful new system, Dolby SR (spectral recording), intended to bring analog recording into the digital age.
		Dolby's move into the world of digital audio has been facilitated by its many years of research into psychoacoustics and noise reduction, which is in essence a form of analog audio coding.
		Dolby's digital technologies use that apparent weakness to its advantage, by deliberately allowing the noise level to go up to a point at which it is just hidden, or masked, by audio signal itself.
	shinnaleaven.spaces.live.com /Blog/cns!1843948AB2A12542!880.entry (1548 words)

	Cableman.com.au ::
		Dolby Stereo brought 4 channel sound to the movie theatre with three channels of sound in the front (left and right for music and effects and centre for dialog) and a surround channel for effects and atmospheres.
		Dolby noise reduction works by lowering the noise when no audio signal is present, while allowing strong audio signals to cover or mask the noise at other times.
		Indeed, Dolby Laboratories' unique experience with audio noise reduction is essential to AC-3's effective data rate reduction: the fewer the bits used to describe an audio signal, the greater the noise.
	www.cableman.com.au /dolby.php (772 words)

	Noise Reduction in Tape Recording
		The fidelity of a tape recording is limited by "tape hiss", high frequency random noise resulting from the fact that the magnetizations of the oxide particles of the magnetic emulsion do not add to exactly zero even in the absence of a recorded signal.
		Noise reduction systems like the Dolby and dbx systems help to overcome this by pre-emphasis of high frequency, low-intensity music signals upon recording so that they, along with the tape hiss, can be de-emphasized upon playback.
		A persistent random noise signal from the residual magnetization of the oxide granules limits the fidelity of magnetic tape recording.
	hyperphysics.phy-astr.gsu.edu /hbase/audio/tape4.html (374 words)

	Interview with Ioan Allen - Part 1 (Site not responding. Last check: 2007-10-20)
		The Dolby process became essential for the rock and roll musicians I was listening to, who were experimenting with new 8-track, 16-track, and seemingly impossible, 24-track tape recorders, where the noise from each track, when added together, became a real detriment to quality.
		Dolby later found wide acceptance in consumer cassette decks, which because of the size of the tape and the slow speed at which it traveled over the heads had inherent noise problems, as well.
		Dolby noise reduction made it possible to extend the highs and lows without the noise becoming so obvious.
	www.editorsguild.com /newsletter/SepOct01/ioan_allen_one.html (2500 words)

	Dolby Sound
		There are now Dolby equipped studios in 27 countries set up to mix in the Dolby system, although not all of them are equipped to do SR and/or 70mm Dolby mixes.
		The basis of the system is noise reduction, a system of audio compression and later decompression of the audio's dynamic range, like in familiar domestic sound equipment from walkmans to component stereos.
		Dolby also manages to maintain a wide frequency response, partly by checking that certain standards are met during the mixing and sound neg.
	jkor.com /peter/dolby.html (2144 words)

	Digital One - Geeks Only - Dolby
		Dolby Digital has been used to bring you Dolby Digital movies for several years, and now, due to the advent of Dolby Digital laser discs, you are able to enjoy this unique performance in your own home.
		Dolby Laboratories' unique experience with audio noise reduction is essential to Dolby Digital 's effective data rate reduction because the fewer the bits used to describe an audio signal, the greater the noise.
		Dolby noise reduction works by lowering the noise when no audio signal is present, but allowing strong audio signals to cover or "mask" the noise at other times.
	www.digone.com /index.cfm?fuseaction=dolby.load&page=dolby2.html (2194 words)

	CSST Dolby Page
		Dolby changed all of that with an encode-decode technology and new optical standards that brought optical film sound into the "high-fidelity" arena.
		Dolby has also made another technological breakthrough with its SR technology which expands the frequency response and signal to noise ratio even further for movies.
		Dolby has joined the digtal reproduction arena with their 6 channel SR-D technology where digital sound is encoded right on the film.
	www.csst.net /dolby (590 words)

	Dolby Laboratories (Site not responding. Last check: 2007-10-20)
		Dolby was persuaded by HenryKloss of KLH to manufacture a consumer versionof his noise reduction.
		In 1975 Dolby released Dolby Stereo, which a included noise reduction system in addition to more audio channels(Dolby Stereo could actually contain additional center and surround channels).
		Dolby Digital was first usedon the 1992 film Batman Returns.The format was later adopted as part of the DVD specification.
	www.therfcc.org /dolby-laboratories-173258.html (222 words)

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