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Topic: Dolby Pro Logic

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	Dolby Pro Logic - Wikipedia, the free encyclopedia
		Dolby Surround was originally developed by Dolby Laboratories in 1976 for analog cinema sound systems as Dolby Analog SR (Spectral Recording).
		Dolby Surround is the encoding counterpart to Dolby Pro Logic's decoding technology, but early home implementations of Dolby Surround decoding went by the name Dolby Surround which can cause some confusion.
		Dolby Surround and Dolby Pro Logic decoders are almost identical in practice, as both use Matrix technology to extract extra channels from stereo-encoded audio.
	en.wikipedia.org /wiki/Dolby_Pro_Logic (576 words)

	HeadWize - Technical Paper: Pro Logic Surround Decoder Principles of Operation by Roger Dressler
		If you are familiar with the general principles of Dolby Surround, you may wish to scan ahead to Part 2 for the discussion of Pro Logic decoding.
		Pro Logic is an active process designed to enhance sound localization through the use of high-separation decoding techniques.
		To summarize, Pro Logic operates by continuously monitoring the encoded soundtrack, evaluating the inherent soundfield dominance, and applying enhancement in the same direction and in proportion to that dominance.
	www.headwize.com /tech/dolby1_tech.htm (5953 words)

	Dolby Pro Logic explained
		The Pro Logic encoding and decoding process ensures that noise levels (extraneous sounds not intended by the movie makers) are lowered when the audio signal is small or not present.
		Dolby Surround technology may be found in amplifiers, receivers, separate decoders, and televisions from around forty manufacturers.
		Pro Logic can also accept several speaker configurations, making it possible to get the highest performance in any system: left and right speakers create stereophonic effects, surround channel speakers add spatial depth and increase viewer involvement, the centre speaker gives precise sound positioning over a large viewing area.
	www.virtualmags.com.au /Sofa/technology/dolby_prologic.htm (617 words)

	A Listener's Guide to Dolby Pro Logic II
		Pro Logic II is a dramatically improved, updated matrix surround system, based on the principles used to develop the original Dolby Pro Logic decoding back in the 1980s.
		Pro Logic II further enhances the sound with a full-range stereo surround output and a greatly improved steering logic, resulting in high channel separation and an exceptionally stable soundfield.
		Pro Logic II is available in standalone processors that can be added to existing car audio systems, or as a feature built into OEM and aftermarket car audio systems.
	www.wildwestelectronics.net /lisguidtodol1.html (988 words)

	Dolby Pro Logic (Site not responding. Last check: 2007-10-17)
		Pro Logic a lso supplies higher separation among all four channels and more accurate sound positioning, which along with the center channel enable a greatly expanded listening area.
		Dolby Surround Pro Logic is the best way to accurately reproduce the Dolby Stereo the atre experience in your home and will ensure that you hear Dolby Surround soundtracks as the producer intended.
		The Dolby 3 Stereo mode can be useful if you are unable to install surround speakers right away, and with a full surround system it may prove preferable for such program sources as synthesized "stereo" TV broadcasts or music recordings with vocal solos.
	www.cityinfonetz.de /homepages/gliesman/dolby/sound1.html (435 words)

	Dolby \| News and Events
		Dolby Pro Logic II is the world's fastest-growing matrix surround format that delivers five full-range surround channels, improved steering logic, greater channel separation, and an exceptionally stable soundfield.
		Dolby Pro Logic II is fully compatible with Dolby Surround Pro Logic technology and can optimally decode the thousands of commercially available Dolby Surround encoded videocassettes, television programs, and videogame titles for playback in a 5.1-channel home theater system.
		Dolby, Pro Logic, and the double-D symbol are trademarks of Dolby Laboratories.
	investor.dolby.com /ReleaseDetail.cfm?ReleaseID=155936 (753 words)

	Dolby Pro Logic II explained
		Dolby Pro Logic II is the latest consumer product to come from Dolby Labs in the US.
		Pro logic II is an improved and enhanced adaptation of the early Dolby matrix circuitry.
		Importantly, with Pro Logic II the rear surround channels are dedicated left and right channels, not a mono (summed) channel.
	www.virtualmags.com.au /Sofa/technology/dolby_prologicII.htm (262 words)

	Stereo vs. Dolby Pro-Logic vs. Dolgy Digital (AC-3) vs. DTS (Site not responding. Last check: 2007-10-17)
		Dolby Pro-Logic is clever though because the signals indicating which sounds should come from which of the 5 or 6 speakers are 'hidden' in a regular stereo audio track and so regular stereo audio cables can be used and in fact Dolby Pro-Logic sound tracks can be recorded on VHS tapes.
		If you have a receiver with a built-in Dolby Digital decoder, which means it can receive the digital information for all 6 channels of audio and decode which signal is for which speaker, you can buy a less expensive DVD player without a Dolby Digital encoder in it.
		If you have a receiver that is described as 'Dolby Digital Ready' then it has 6 separate analog audio input connectors and you should buy a DVD with a built-in Dolby Digital decoder, which will have 6 separate analog audio output connectors to connect to the receiver.
	www.higginbottom.com /paul/homethtr/dolbydig.htm (657 words)

	Dolby Pro Logic IIx
		While Dolby's Cinema Matrix system, Dolby Stereo, and the consumer equivalent, Dolby Pro Logic, are not the only Matrix Surround Sound systems in the world, but they are arguably the best as evidenced by their commercial success.
		This is the same principal as Dolby Digital EX, and in fact the same source track as a Dolby Digital EX soundtrack, only at decode time it uses DTS's own matrix technology to derive the trio of surround channels.
		While inevitably all SSPs and Receivers will in time have Pro Logic IIx, the only consumers who might replace their hardware to get it would be those who have an obsession with using all their speakers all the time, or those who have to have the latest and greatest at any cost.
	www.hometheaterhifi.com /volume_11_1/feature-prologic-iix-3-2004.html (1876 words)

	Rockford Fosgate First Manufacturer to License New Dolby Pro Logic II Surround Decoder
		Dolby Pro Logic II bridges the gap between Pro Logic and discrete Dolby Digital 5.1-channel audio by presenting existing Dolby Surround encoded programs with a new sense of spatiality and directionality heretofore achieved only with discrete multichannel audio.
		For the car audio environment with the Dolby Pro Logic II technology, the RFQ5000 will now allow for front/rear fader, or "panorama," mode as well as center image width control, which were not available with the original Pro Logic technology.
		According to Dressler, the key to Pro Logic II is the first fundamentally new approach to matrix decoder design since the basic Scheiber model, still found at the core of every other active matrix surround decoding system, including Pro Logic.
	www.carsound.com /news/archives/6_20_100_3.shtml (842 words)

	Hydrogenaudio Forums -> Dolby Pro Logic
		Actually the CD does not need to be mastered for Pro Logic for the processor to work (the "surround" effect you are getting more often than not is a result of the decoder and not the encoder and decoder).
		Pro Logic will do something to a 2-channel signal sent to it -- but that doesn't mean the source was mastered with Pro Logic processing in mind.
		Pro Logic II, the successor to DPL, was designed explicitly to accept any two-channel stereo mix as input, and render it into a reasonable simulacrum of 5.1.
	www.hydrogenaudio.org /forums/index.php?showtopic=29896 (2007 words)

	Dolby Pro Logic II works to improve and add surround sound to CDs, MP3s
		Pro Logic II is a new matrix decoder developed by Jim Fosgate and licensed by Dolby.
		Pro Logic II works not only with Dolby Surround-encoded material, but also with stereo material, including music CDs, stereo TV broadcasts, FM radio, MP3 files, etc. It offers modes for both Movies and Music (the Music mode is optional, but has been included on all Pro Logic II products to date).
		Pro Logic II is popping up in some of the newest Japanese receivers from Kenwood, Onkyo and others.
	www.audiorevolution.com /news/0501/16.prologic2.shtml (230 words)

	BeoWorld.co.uk... a World of Bang & Olufsen online (Site not responding. Last check: 2007-10-17)
		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)

	Cirrus Logic Incorporates New Dolby Pro Logic IIx into Audio DSP Families
		Harman Kardon said that it also intends to integrate Dolby Pro Logic IIx into selected receivers this fall, and the CS49300 DSP is a key ingredient in Fosgate Audionics' new FAP T1+ surround processor/preamp, on display in CEDIA Expo booth #1508.
		The new processor is the first to feature Dolby Pro Logic IIx, an upgrade of Jim Fosgate's original DPL II technology that now provides a 7.1 solution for high-end enthusiasts who want to enjoy superior multichannel performance from a two-channel source recording.
		Dolby Pro Logic IIx technology delivers a highly immersive and natural 7.1 channel surround-sound listening experience to the home-theatere environment.
	www.cirrus.com /en/press/releases/P371.html (454 words)

	AudioEnz - Surround confusion! Dolby Pro Logic, Dolby Digital and DTS explained (Site not responding. Last check: 2007-10-17)
		One of the main reasons for the success of Pro Logic is that all of the surround sound information was encoded (or matrixed) within a normal two-channel (stereo) soundtrack.
		Unlike Pro Logic, the five main channels are full range, which means that they handle the complete range of sounds from 20Hz (very low bass) to 20kHz (very high treble).
		Dolby Digital uses a means of compression to fit all six sound channels on to a DVD.
	www.audioenz.co.nz /2001/0404.html (840 words)

	Business Wire: Dolby Laboratories Unveils Dolby Pro Logic IIx; Technology Provides up to 7.1 Channels for Stereo and ...
		Dolby Pro Logic IIx technology provides home theater enthusiasts with a solution for 7.1-channel playback of traditional stereo and 5.1-channel content, while maintaining all the richness and clarity inherent in any Dolby audio technology.
		Dolby Pro Logic IIx is the first technology to offer the choice of processing traditional stereo music and movie content into a 6.1- or 7.1-channel listening experience.
		Dolby Pro Logic IIx technology expands upon highly sophisticated discrete and matrix decoding technologies developed by Dolby Laboratories, ensuring the highest quality and most thrilling audio experience available from today's entertainment software.
	www.findarticles.com /p/articles/mi_m0EIN/is_2003_Sept_2/ai_107171106 (1088 words)

	Dolby Pro Logic II
		Check your receiver (you may already have DPL II and not know it) and switch it to DPL II, Music mode.
		DPL II is a dramatically improved matrix surround system based on the original Dolby Pro Logic system first introduced in 1987, which was already a major upgrade of the original Dolby Surround matrix.
		Compared to “old” Pro Logic, DPL II offers two full-range stereo surround channels, more sophisticated steering logic, high channel separation and an exceptionally stable sound field.
	www.axiomaudio.com /archives/dolbyprologicII.html (943 words)

	Dolby Pro Logic II Approved for iBiquity HD Radio System (Site not responding. Last check: 2007-10-17)
		Dolby Pro Logic II technology provides a high-quality, full surround sound experience on any two-channel service, such as stereo radio and television broadcasts.
		Content encoded in Dolby Pro Logic II is stored, edited, and broadcast as traditional two-channel signals, and is then decoded into five-channel surround sound by the listener's Dolby Pro Logic II receiver.
		Dolby Pro Logic II is also used extensively in the television broadcast and cable industry.
	www.prnewswire.com /cgi-bin/stories.pl?ACCT=104&STORY=/www/story/04-19-2005/0003435838&EDATE= (665 words)

	Product Review
		The Pro Logic decoder, a direct descendant of the cinema Dolby Stereo decoder, is best thought of as a passive decoder followed by an active matrix which provides directional enhancement though a constant power concept.
		In Pro Logic II, the most significant technical difference from Pro Logic is that it incorporates a "feed back" design, in that the directional enhancements are applied back to the input of the active matrix.
		Dolby has the answer, with Pro Logic II, giving full range stereophonic sound even in the rear, and Meridian, being a world leader in consumer electronics, is the first to deliver.
	www.hometheaterhifi.com /volume_8_1/dolby-prologic2-3-2001.html (6789 words)

	Dolby Pro Logic II vs. SRS Circle Surround
		While matrix surround systems such as Dolby Pro Logic II (DPLII) and SRS Circle Surround (CS) cannot perform as well as discrete digital systems, they are effective solutions for many broadcasters.
		The listening test comparison of the Dolby Pro Logic II and SRS Circle Surround matrix audio systems was conducted in an audio/video post-production studio.
		To stress the steering logic of the two systems, we sequenced and recorded a series of kick drum hits bouncing between the front channels (L-C-R), the rear channels (Ls-Rs), front and rear, and between the LFE and the five main channels.
	broadcastengineering.com /mag/broadcasting_dolby_pro_logic/index.html (1570 words)

	Dolby Pro Logic Surround Sound - Gizmo Highway Technology Guide
		Improvements in this technology led to the development of Dolby SR (Spectra Recording), which was introduced for consumers in the form of Dolby Surround Pro Logic in 1987.
		Dolby Pro logic is a totally analogue format, the advantages are a Pro Logic amp can take the stereo sound from any stereo input and decode the pro logic encoding in the stereo sound track.
		Pro Logic has since been superseded by Dolby Digital, a superior sound format that is mainly found on DVDs, fortunately nearly all Dolby Digital amps are backward compatible with Pro Logic and therefore your VCR and TVs sound output.
	www.gizmohighway.com /hifi/dolby_pro_logic.htm (316 words)

	Dolby Pro Logic / Pro Logic II - Surround Sound Settings (Site not responding. Last check: 2007-10-17)
		Pro Logic improved on the original Dolby Surround format by adding a matrix center channel.
		Dolby removed the bandwidth limitations on the rear channel and added a low frequency matrix for bass management making Pro Logic II a 4.1 surround matrix.
		Pro Logic II receivers can give the user control over the depth and width of the soundstage by remote control.
	www.hometheaterfocus.com /surround/dolby-pro-logic.aspx (427 words)

	Dolby Pro Logic II Continues Growth (Site not responding. Last check: 2007-10-17)
		According to Dolby Laboratories, Dolby Pro Logic II--which was developed for home A/V receivers, automobiles and PCs--creates a natural five-channel listening experience from any stereo source and is recognized as a standard for matrix surround decoding technology.
		Dolby Laboratories expanded the five-channel Pro Logic II listening experience to 7.1 channels with the introduction of Dolby Pro Logic IIx in 2003.
		Dolby Pro Logic IIx works with any stereo, Dolby Surround, Dolby Pro Logic II, or Dolby Digital encoded material to create a surround sound field.
	www.resmagonline.com /articles/publish/printer_344.shtml (227 words)

	HOME THEATER REFERENCES
		Dolby Digital is a discrete digital system offering six separate channels of sound with a dedicated subwoofer channel for deep bass.
		Dolby Digital has been declared the audio standard for DVD and HDTV.
		Dolby Digital offers greater dynamic range than Pro-Logic, better frequency response and improved separation between channels.
	www.yamaha.co.jp /english/product/av/guide/referrences/dolby.html (458 words)

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