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Topic: Dolby B

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	Dolby noise reduction system - Wikipedia, the free encyclopedia
		Dolby S is much more resistant to playback problems caused by noise from the tape transport mechanism than Dolby C. Dolby developed another system in 1982 called Dolby HX, which works by modifying the ultrasonic bias signal, used by all analogue tape decks, to increase the headroom for high-frequency audio signals.
		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 (1128 words)

	Dolby Laboratories - Wikipedia, the free encyclopedia
		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 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.
	en.wikipedia.org /wiki/Dolby_Laboratories (1107 words)

	Phish.Net FAQ: Dolby and DBX
		Dolby B/C boost the high end of your signal before they put the signal onto the tape, & cut it as it comes off, so that the net result is that noise added to the already increased high end is cut.
		Dolby B is pretty insensitive to tape-deck parameters, so you can use it between decks.
		Dolby C is MUCH more sensitive to tape deck parameters such as head alignment, bias adjustment, signal pickup, etc, etc, so that you can definetly tell when a dolby C tape is played on a tape deck that it wasn't recorded on.
	www.phish.net /faq/dolby.html (1013 words)

	TVTechnology - Inside Audio
		Dolby A came on the scene around 1967, followed a year or so later by Dolby B. Dolby A is a professional noise-reduction system that uses four separate bands of companding.
		Dolby B is a consumer equipment system that uses one band of companding, concentrating on high frequencies.
		Interestingly, and not coincidentally, Dolby C was advertised as yielding 20 dB of noise reduction.
	www.tvtechnology.com /features/Inside-Audio/f-DM-dolby-07.10.02.shtml (961 words)

	Thomas Dolby - Biography - AOL Music
		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.
	music.aol.com /artist/thomas-dolby/4112/biography (974 words)

	Digital Silence - Dolby Labs: Past, Present and Future
		Dolby "B"'s premise was rather simple; record music with amplified high frequencies and during playback, reduce the high frequencies by the same value.
		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.
		Today the Dolby SR encoded analog optical soundtrack, with its ultra-low noise and distortion, is the state-of-the-art of analog film sound, and is used for the vast majority of releases, including those that also have digital soundtracks.
	www.d-silence.com /articles/dolby1.shtml (573 words)

	Dolby Surround Sound
		Dolby A, B, C, S and SR are noise reduction processes that have nothing to do with surround except that Dolby MP uses a modified Dolby-B on the surround signal, and VHS linear stereo uses (additional) normal Dolby-B on both channels.
		Dolby HX-Pro is a variable-bias technique for analog tape recording and has nothing to do with tape playback, much less optical media or surround sound.
		Dolby recommends that the surround speakers be located 5 feet closer to the average listener than the front speakers, and that the "surround" signal be electronically delayed by 20 milliseconds (for a net arrival delay of 15 mSec compared to "front" sound).
	margo.student.utwente.nl /el/audio/dolby1.html (5273 words)

	How to make sure your Dolby B or C recordings are done right
		The key is the proper use of the Dolby noise reduction that is built into your cassette deck.
		Dolby B was invented decades ago and is used in nearly all prerecorded cassette tapes.
		Dolby C is relatively new, and is used mostly in home tapings; only a few recording companies issue their tapes in the Dolby C format.
	aroundcny.com /technofile/texts/dolbyexplain87.html (783 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.
		Dolby's noise-reduction technology not only improved the ability of audio professionals to make more realistic recordings, but also ushered in an era of private recording by music fans that presaged the current controversy over downloading and CD burning.
	www.stereophile.com /news/050304dolby (878 words)

	BeoWorld.co.uk... a World of Bang & Olufsen online (Site not responding. Last check: 2007-10-01)
		Dolby C-type noise reduction was developed to improve the cassette medium still further by providing twice the tape hiss reduction (20 dB) of Dolby B-type.
		Dolby S-type is still steadily gaining momentum and is being incorporated first in state-of-the-art decks for the most discerning listeners.
		Dolby Headphone has the technology to offer three impressive 'Listening rooms' which are controlled from the main unit or the in-line remote control they offer.
	www.beoworld.co.uk /dolby.htm (1420 words)

	Noise Reduction in Tape Recording
		The Dolby systems for noise reduction employ circuitry which pre-emphasizes high frequencies before they are recorded onto tape in order to make them larger than the tape hiss noise with which they compete.
		Upon playback, a matched de-emphasis circuit is employed to restore the high frequencies to their proper balance with the other part of the recorded signal.
		If a tape is recorded using a Dolby noise reduction system, then it should by played back with the same system.
	hyperphysics.phy-astr.gsu.edu /hbase/audio/tape5.html (287 words)

	Dolby Genealogy
		Though I do not yet have proof, I believe that this is the father of William Dolby, who is also residing in Lawrence County with his wife, Jenny and a child, D.A. At the time of this census, William is 19.
		In the 1850 census she is listed Sally but in 1870 she is listed as Sarah A. Dolby and she is living with her son, Nathaniel.
		She says, “He was an old man when I was a very young but I remember him having a long white beard.” Aunt Violet says that she remembers someone saying that William served in the Civil War.
	home.columbus.rr.com /linjack/dolby_genealogy.htm (1738 words)

	IEEEVM: Dolby Laboratories
		Dolby A was a new form of a technique called audio compression and expansion, which was used for many years in recording and radio studios.
		Dolby Laboratories was able to use Dolby B to create cassette recordings that rivaled LP records for high fidelity.
		Dolby’s continued leadership was again demonstrated in 1986 with the introduction of a powerful new system, called Dolby SR (Spectral Recording).
	www.ieee-virtual-museum.org /collection/event.php?taid=&id=3456920&lid=1 (604 words)

	FAQ: rec.audio.* Recording 2/97 (part 7 of 13) (Site not responding. Last check: 2007-10-01)
		Dolby B works mostly with higher frequencies; it increases their levels during recording and decreases their levels, and the levels of high-frequency noise such as tape hiss, during playback.
		Dolby C achieves greater noise reduction (about 8-10 db) than Dolby B by working with a greater range of frequencies and altering relative levels more; this means that playing Dolby C tapes back with no Dolby processing or with Dolby B, leads to very bad frequency response and a sound that most people find unpleasent.
		Dolby C may also be more sensitive to variations among decks in exact frequency response, alignment, etc. Some people find that tapes recorded using Dolby C sound best only when played back on the deck on which they were recorded.
	omicron.felk.cvut.cz /FAQ/articles/a1947.html (5120 words)

	GameDev.net - Dolby Surround Sound
		The Dolby decoder reproduces a fairly good semblance of the original four channels from the two input channels, though there will always be leakage and crosstalk.
		Dolby standard state that you should do +90 and -90 phase shifting on left & right channels, but I've found out that doing a 0 and +180 shift works as well.
		Dolby is a trademark of Dolby labs, and should not be used on a product without getting their permission.
	www.gamedev.net /reference/articles/article440.asp (1609 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)

	Dr. Gizmo: Finding a Dolby decoder; choosing the best operating system
		Played without Dolby decoding, Dolby tapes sound a little harsh; what's worse, of course, is that non-decoded Dolby tapes sound decidedly "false" to many people who love hi-fi sound.
		The doc still has a Dolby B decoder -- a Concord Dolby B encoder-decoder combo unit, in fact, dating from the late 1960s — and he also owns an old Marantz 3800 Stereo Console with built-in Dolby B encoding and decoding.
		If J.S. has an open-reel Dolby B alignment tape, he can play that tape and record it on the cassette deck to establish what is called a Dolby reference level on the cassette tape.
	aroundcny.com /technofile/texts/giz092502.html (477 words)

	Audio cassettes with Dolby C show big advances
		They indicated that each tape was duplicated with the latest consumer noise-reduction technique, the Dolby type C system, and that each was processed through an HX Pro circuit.
		Dolby C is built into nearly every cassette deck sold today.
		In other words, they might be played with a cassette deck's noise-reduction switch in the Dolby B" position - or listened to on a portable player without any noise reduction at all.
	aroundcny.com /technofile/texts/dolbyc86.html (950 words)

	Operating Instructions for the REVOX A77 equipped with DOLBY B System
		The DOLBY noise reduction System operates with a dynamic filter whose characteristics are determined by the constantly varying sound levels.
		DOLBY encoded recordings are to be modulated in the same manner as any standard recording by adjusting the record levels with the level controls 15 and 17.
		A DOLBY equipped recorder is especially suitable for multi playback recordings since the reduced tape hiss will permit an increased number of transfers without any deterioration in quality (your attention is drawn to the signal to noise ratio of the sound source).
	www.reeltoreel.de /worldwide/A77DolbyE2.htm (956 words)

	Compact Cassette - Wikipedia, the free encyclopedia
		Between the 1970s and early 1990s, the cassette was one of the two most common formats for prerecorded music, alongside the LP and later the Compact Disc.
		The Advent cassette deck was one of the first truly high fidelity decks, using a 3M Wollensak transport with CrO2 tape and the Dolby noise reduction system with an unusual single VU meter.
		A major innovation was the front loading arrangement, starting with Pioneer's angled cassette bay and exposed bays with Sansui, they would standardize with a front-loading door into which a cassette would be loaded.
	en.wikipedia.org /wiki/Compact_audio_cassette (3817 words)

	Atwell Genealogy
		She married (1) NATHANIEL DOLBY August 26, 1860 in Lawrence County, Ohio (Burlington) son of NATHANIEL DOLBY and SARAH ?.
		Note that at one point about 1870 Nathaniel in Pike County can be found with his mother living in his household and her name is Sarah A. Dolby.
		Signed: W. Atwell and Sarah Thacker (her mark)Submitted in my presence and sworn to before me this the 6th day of May AD 1874 ___ did certify that the affiants are credible______ and that I have no interest in the ______ of this claim.
	home.columbus.rr.com /linjack/atwell_genealogy.htm (2283 words)

	Copeland Family History and Genealogy - Person Page 228
		Christening: Ann Dolby* was christened on Sunday, 1 January 1786 in Foston, LIN.
		Christening: Elizabeth Dolby* was christened on Monday, 12 January 1789 in Foston, LIN.
		Christening: Thomas Dolby* was christened on Monday, 10 February 1800 in Foston, LIN.
	www.btinternet.com /~robert_copeland/all-p/p228.htm (495 words)

	Diamond Cut User Forum - View Single Post - Using filter settings to correct 'Dolby B"
		I started looking at Dolby's Website, and found a lot of hype (er, information) about Dolby B. Even some useful frequency response and gain curves.
		Dolby describes Type B as using a filter with both sliding gain and sliding frequency breakpoint.
		Dolby B was level sensitive (unlike dBx, which was not, but that's another story).
	www.diamondcut.com /vforum/showpost.php?p=700&postcount=8 (378 words)

	At My Cinema: Systems NET (Site not responding. Last check: 2007-10-01)
		Dolby® Digital (Dolby Digital is a highly sophisticated and versatile audio encoding/decoding technology.
		Dolby® Pro Logic II (Technology processes any high quality stereo (two-channel) movie and music audio into five playback channels of full-bandwidth surround sound.
		Dolby® Pro Logic IIx (The age of 7.1 surround sound for the home is here.
	www.home.no /atmycinema/system.html (601 words)

	Home Recording dot com BBS - Mixing Dolby B tapes on non-Dolby B deck
		I have a lot of 4-track tapes that were recorded on a Fostex X-13 with Dolby B noise reduction ON.
		Playing back Dolby B encoded tapes without Dolby on means you essentially get a high-frequency boost (and consequently more hiss - which you can remove with a denoiser) -- but given that the frequency response of cassette multitrackers is impaired anyways, the added boost may be somewhat beneficial....
		With DBX or Dolby C, however - it's not that simple -- DBX encoding involves signal compression and Dolby has multi-stage frequency adjustment and is particularly sensitive to Dolby mistracking, so recovering those types of tracks really does require the same types of machines for proper playback.
	homerecording.com /bbs/showthread.php?t=72245 (236 words)

	Diamond Cut User Forum - Using filter settings to correct 'Dolby B"
		I have a number of music concerts etc. that were recorded on to 10.5 inch tapes on a Revox B77 some 20 years ago, using a Dolby B unit.
		Dolby B was designed to reduce only higher-frequency tape hiss.
		Dolby was great in a studio environment, where there were accurate meters on every tape deck, and the decks were aligned and adjusted frequently...
	www.diamondcut.com /vforum/printthread.php?t=170&pp=40 (1491 words)

	The famous Revox A77 MK IV taperecorder
		Special version REVOX Dolby A 77 Tape Recorder containing entirely new Dolby B circuits to achieve the ultimate in noise reduction: even the softest pianissimo can be free of tape noise.
		Dolby encoded multiple transfers and off tape monitoring becomes possible without restrictions or compromise.
		However, only in the REVOX Dolby A 77 has the incorporation been so simplified that the sole adjustment required by the user is the setting for individual tape efficiency.
	www.reeltoreel.de /worldwide/A77DolbyE1.htm (391 words)

	Sweetwater inSync
		Dolby B-type noise reduction, providing about 10 dB of noise reduction at high frequencies, was a simplification of A-type that was introduced in 1968.
		Dolby makes professional B-type encoding equipment that is sold to tape duplicators, allowing them to make consumer B-type encoded cassettes.
		Dolby B has become a maligned form of noise reduction in the past 20 years because so many users have reported a loss of high frequency content on playback with it.
	www.sweetwater.com /insync/word.php?find=DolbyB (370 words)

	Copeland Family History and Genealogy - Person Page 229
		Christening: William Dolby* was christened on Sunday, 23 January 1791 in Foston, LIN.
		Christening: Mary Dolby* was christened on Tuesday, 14 January 1794 in Foston, LIN.
		Marriage: Jane at age 28, married George Dolby* at age 21, son of William Dalby and Millicent Spittlehouse, on Monday, 17 October 1831 in Westborough, LIN.
	www.btinternet.com /~robert_copeland/all-p/p229.htm (331 words)

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