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Topic: Coherent Acoustics

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	Acoustics - Wikipedia, the free encyclopedia
		Acoustics is a branch of physics and is the study of sound, mechanical waves in gases, liquids, and solids.
		Biomedical acoustics is the study of the use of sound in medicine, for example the use of ultrasound for diagnostic and therapeutic purposes.
		Physical acoustics is the study of the detailed interaction of sound with materials and fluids and includes, for example, sonoluminescence (the emission of light by bubbles in a liquid excited by sound) and thermoacoustics (the interaction of sound and heat).
	en.wikipedia.org /wiki/Acoustics (1173 words)

	Acoustics - Open Encyclopedia (Site not responding. Last check: 2007-10-29)
		Aeroacoustics is the study of how sound and gas flow interact and has particular application to aeronautics, examples being the study of sound made by jets and the physics of shock waves (sonic booms).
		Physiological Acoustics is the study of the mechanical, electrical and biochemical function of hearing in living organisms.
		Vibration Acoustics Structural Acoustics and Vibration is the study of how sound and mechanical structures interact and includes the transmission of sound through walls and the radiation of sound from vehicle panels.
	open-encyclopedia.com /Acoustics (1031 words)

	coherent acoustics (Site not responding. Last check: 2007-10-29)
		Coherent Acoustics is a sound format based on the DTS standard.
		The 'DTS Coherent Acoustics' codec (what 'DTS' commonly refers to) was born out of the need for a consumer grade compression scheme.
		The DTS Coherent Acoustics standard (ETSI 102 114 v1.2.1), is published by the ETSI and available here (look for DTS Coherent Acoustics).
	www.yourencyclopedia.net /coherent_acoustics.html (186 words)

	DTS Coherent Acoustics - Wikipedia, the free encyclopedia
		DTS Coherent Acoustics is the full name for the audio format standard usually known as just DTS.
		The DTS Coherent Acoustics standard (ETSI 102 114 v1.2.1), is published by the ETSI and available at[1] (look for DTS Coherent Acoustics).
		An open source DTS decoder called libdca is part of the VideoLAN project, but it was withdrawn from official public distribution because of DTS patent infringement claims.
	en.wikipedia.org /wiki/Coherent_Acoustics (384 words)

	Publications of Professor Milica Stojanovic-Zvonar (Site not responding. Last check: 2007-10-29)
		Performance of an adaptive coherent receiver with maximum-ratio combining and that of a differentially coherent receiver with equal-gain combining are evaluated analytically, showing functional dependence on the fading rate of the channel and the number of active CDMA users.
		The comparison of the two receiver structures indicates that the coherent decorrelating receiver with diversity reception may be preferable to the differentially coherent one in nonselective fading CDMA channels with memory.
		To analyze the impact of channel estimation errors on the receiver performance, error probability of coherent decorrelating receiver is assessed directly in terms of fading rate and the number of active users, showing the penalty imposed by imperfect channel estimation as well as fading-induced error probability floor.
	www.cdsp.neu.edu /publications/stojanov/index.html (8138 words)

	Untitled Document
		DTS Coherent Acoustics is a competing codec to that developed by Dolby Laboratories and marketed as AC-3®, which we covered extensively during its pre-introduction period last year, and continue to do so on an on-going basis.
		The purpose behind the development of DTS Coherent Acoustics® was to enable mastering quality digital audio to be delivered to the home on existing and proposed new me-dia platforms.
		Within the DTS Coherent Acoustics framework is a digital audio compression methodology which operates directly on the linear PCM data in order to reduce the bit rate, with-out affecting the fidelity of the audio signal itself.
	www.surroundmusic.net /articles/dtsco2.html (4315 words)

	Coherent Acoustics -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-29)
		DTS Coherent Acoustics is the full name for the audio format standard usually known as just (Acute delirium caused by alcohol poisoning) DTS.
		An (additional info and facts about Open Source) Open Source DTS decoder called is part of the (additional info and facts about VideoLAN) VideoLAN project, but it was withdrawn from official public distribution because of DTS patent infringement claims.
		The DTS Coherent Acoustics standard (ETSI 102 114 v1.2.1), is published by the (additional info and facts about ETSI) ETSI and available (look for DTS Coherent Acoustics).
	www.absoluteastronomy.com /encyclopedia/c/co/coherent_acoustics.htm (475 words)

	Underwater acoustics software (Site not responding. Last check: 2007-10-29)
		A well-known method of normal waves (modes), enhanced for the event of arbitrary source directivity, is used for computer simulation of sound propagation in the laminate (1-D inhomogeneous) ocean.
		For the case of 2-D inhomogeneous ocean, an original method of non-coherent ray acoustics (NCRA) has been elaborated.
		Influence of diffraction effects upon slightly - divergent acoustical beams forming in ocean waveguides.
	www.angelfire.com /sc/dmitrya/ocean.html (510 words)

	Volume 7: Undersea Warfare; Chapter 1
		Acoustic propagation is strongly dependent on the temporal and spatial variability of the medium even at modest ranges.
		Acoustic coherence is driven by the spatial and temporal variability of the ocean.
		Acoustic wavelengths for ASW are usually between 1 and 100 m, which sets the scale needed for the scattering physics.
	stills.nap.edu /html/tech_21st/uw1.htm (14188 words)

	Selected publications list
		Thorne, K. "Application of acoustics to nearbed marine sediment transport processes: where are we?" 2651-2652 in, Proceedings of the tenth International Congress on Sound and Vibration, 7-10 July 2003, Stockholm, Sweden.
		"Acoustic measurements of suspended sediments in the laboratory and at sea." Journal of the Acoustical Society of America, 92(4, Part 2): 2306-2307.
		Thorne, P. "Laboratory and marine measurements on the acoustic detection of sediment transport." Journal of the Acoustical Society of America, 80(3): 899-910.
	www.pol.ac.uk /home/staff/publist.php?name=Thorne&init=P.D. (3397 words)

	McKenna Flutes: Sound - The New Acoustics (Site not responding. Last check: 2007-10-29)
		Nature works with energy in discrete packages which gives rise to the perception that the universe is made up of fixed points and objects that are in a steady state, that is to say, they are physically real or quantifiable.
		The language of music and the science of acoustics therefore provide a powerful system means for understanding and working with energetic systems in general.
		And the understanding of acoustics with respect to physics and metaphysics leads us back to a deeper awareness of music and all it entails.
	www.mckennaflutes.com /noi_sound_new.htm (581 words)

	Coherent Acoustics (Site not responding. Last check: 2007-10-29)
		It is ahigh quality codec, which unlike the cinema DTS standard does not require separate DTSCD-ROM media and hardware decoders.
		The 'DTS Coherent Acoustics' codec (what 'DTS' commonly refers to) was born out of the need for a consumer grade compressionscheme.
		The DTS Coherent Acoustics standard (ETSI 102 114 v1.2.1), is published by the ETSI andavailable here (look for DTS Coherent Acoustics).
	www.therfcc.org /coherent-acoustics-148379.html (135 words)

	Untitled Document
		The primary motivation for the development of Coherent Acoustics was to provide a multichannel audio delivery system where any audio channel could surpass the quality of 16-bit Compact Discs in terms of dynamic range and sheer fidelity.
		DTS Coherent Acoustics is based on a uniform 32 band polyphase filter bank, with adaptive differential PCM coding operating on each of the subband signals.
		DTS Coherent Acoustics will be launched commercially at the winter Consumer Electronics Show (CES Convention) in January 1996, with encoded software on LD's and CD's and decoding hardware available.
	www.surroundmusic.net /articles/dtsco3.html (5141 words)

	Sigma Acoustics Ouverture Loudspeakers [English]
		The midrange, warm and mellow, is decidedly coherent with the lower range, and the musical message uninterruptedly flows toward the mid-high range, which - due to its calm, refined and balanced characteristics - can occasionally seem euphonic with some types of music.
		This coherence is retained also in the big dynamic contrasts that the Ouvertures can follow with completeness, adequate velocity and an appreciable sense of realism.
		The notable price difference to the next model up in the Sigma Acoustic catalogue (the Image), leads one to suspect that it is the result of a definite strategic and commercial choice to keep the final price level of the brand’s "entry level" model (Ouverture) as low as possible.
	www.tnt-audio.com /casse/sigma_ac_ouverture_e.html (1599 words)

	Acoustics
		Engineering Acoustics or Electro Acoustics is the study of how sound is generated and measured by loudspeakers, microphones, sonar projectors, hydrophones and ultrasonic transducers and sensors.
		Psychoacoustics or Psychological and Physiological Acoustics is the study of how people react to sound, hearing, perception, and localization.
		Climate is what we expect, weather is what we get.
	www.brainyencyclopedia.com /encyclopedia/a/ac/acoustics.html (1039 words)

	DTS, Dolby Digital and DVD: A History
		Acoustic masking exploits our inability to detect quiet sounds while louder sounds are produced at a similar frequency.
		DTS's Coherent Acoustics coding scheme reduces the number of bits needed by up to a factor of eight, requiring 754kbps, 1235kbps, or 1509kbps, to reproduce six (and up to seven using DTS's ES Discrete 6.1 system) audio channels.
		Improvements in the Coherent Acoustics coding system can be passed directly to the decoder, allowing improvements in overall audio performance to be utilised by all decoders, regardless of age.
	www.spannerworks.net /reference/10_1a.asp (5131 words)

	Coherent Acoustics (Site not responding. Last check: 2007-10-29)
		It is high quality codec which unlike the cinema DTS standard not require separate DTS CD-ROM media and decoders.
		The 'DTS Coherent Acoustics' codec (what 'DTS' refers to) was born out of the for a consumer grade compression scheme.
		The DTS Coherent Acoustics standard (ETSI 102 v1.2.1) is published by the ETSI and available here (http://pda.etsi.org/pda/queryform.asp) (look for DTS Coherent Acoustics).
	www.freeglossary.com /Coherent_Acoustics (460 words)

	Cramped Quarters - Principles of Audio-Data Compression (Site not responding. Last check: 2007-10-29)
		Coherent Acoustics uses a combination of technologies; whether it qualifies as a perceptual coding system depends on the data and ratio as compared to the original source.
		In this application, then, Coherent Acoustics qualifies for the select category of virtually lossless data reduction schemes, warranted to be fully transparent to the listener, but not fully lossless at the data level.
		Coherent Acoustics is best known for its use in high-end surround for DVD.
	www.emusician.com /tutorials/emusic_cramped_quarters/index.html (5452 words)

	ITPapers.com - Recent Sequencing - Synthesizing White Papers (Site not responding. Last check: 2007-10-29)
		They were intended to form guidance notes for use by project managers and other people with responsibilities for designing, commissioning or specifying acoustic aspects of new and refurbished areas.
		In nearly all branches of acoustics models are constructed, either physically or more often as conceptual simplifications, in order to make the problems of design and prediction tractable.
		Coherent Acoustics is a digital audio compression algorithm designed for both professional and consumer applications.
	www.techguide.com /xml/RSS-380.xml (559 words)

	Avalon Acoustics Company Information (Site not responding. Last check: 2007-10-29)
		The subtle artistry musicians had locked away in their recordings, and the visceral emotional experience of live performances, was not convincingly being communicated.
		Next, the world of acoustic measurement techniques had to be sufficiently refined in order to predict and control empirically what we desired from our designs sonically.
		It is with the dedicated attention of the men and women who create each pair of loudspeakers with the labor of their hands, and the meticulousness of their artistic technique, that places our products at the pinnacle of craftsmanship.
	www.avalonacoustics.com /company.html (401 words)

	Multi-Science Publishing - Acoustics Archive on-line
		Acoustics Archive-on line offers access to some 40,000 acoustics related abstracts over the period 1996-2005*, from over 400 sources.
		The backfile is steadily being added, and it is envisaged that the database will go back as far as 1966, offering some 180,000 abstracts: the most complete and coherent database on 'acoustics' available anywhere.
		• because of its interdisciplinary nature, much worthwhile acoustics material is published in non-specialist journals and conference proceedings - the editorial team go out of their way to seek out this work and bring it together, for the convenience of researchers
	www.multi-science.co.uk /acoustics-online.htm (294 words)

	APRI Projects - Laser Induced Thermal Acoustics (Site not responding. Last check: 2007-10-29)
		Laser-Induced Thermal Acoustics (LITA) is a nonlinear optical technique for remotely measuring the sound speed and transport properties of a fluid with accuracy comparable to the best conventional intrusive methods.
		In the coherent scattering step, a CW or long-pulse source laser is trained on the sample volume at the Bragg angle of the gratings.
		Light from the source laser is scattered off the gratings into a coherent signal beam that is detected through large f-number optics.
	www.advancedprojects.com /projects/lita.html (588 words)

	Acoustics Division - Acoustic Signal Processing Branch, Code 7120
		The Acoustic Signal Processing Branch conducts a program of basic and applied ocean acoustics research aimed at measuring, theoretically modeling, and exploiting the space/time properties of underwater acoustic signal and noise fields that are propagating and scattering in a space/time variable ocean.
		The properties of the acoustic signals and noise fields are used to design and estimate the response characteristics of environmentally adaptive underwater acoustic communications, anti-submarine warfare (ALSO), and mine countermeasure (MCM) signal processing and system concepts.
		The Acoustics Signal Processing Branch is not comprised of sections, but rather Projects within Topic Areas.
	www.nrl.navy.mil /code7100/html/code7120.html (312 words)

	DTS - Open Encyclopedia (Site not responding. Last check: 2007-10-29)
		DTS was first shown in the cinema with the release of Jurassic Park in 1993.
		DTS is also the name often used for the 'Coherent Acoustics' codec which is used on DVDs, CDDAs and in wave files.
		This system uses a similar codec but does not require separate DTS CD-ROM media.
	open-encyclopedia.com /DTS (339 words)

	Uni of York: MTG: Hyper Dense Transducer Arrays (Site not responding. Last check: 2007-10-29)
		On the other hand, such systems can, in one sense, be regarded as coherent since the coherency of the frontal image is ensured by the use of decorrelated sounds in the rest of the audio image.
		However the degradation as the listener moves off centre is relatively graceful and sufficiently similar to what would happen in a natural soundfield as not to be unduly disturbing to a listener [26].
		Furthermore, the acoustic interactions and disturbances caused by having so many microphone capsules occupying a small volume, which can already be observed in the first order soundfield microphone, have not been examined though they will undoubtably pose more of a problem than in the first order case.
	www.york.ac.uk /inst/mustech/3d_audio/homogeneous.htm (5145 words)

	Control of Electron Coherences with Coherent Phonons - Storming Media
		Abstract: This report focuses on the generation of coherent phonon fields using ultrafast optical pulses and theoretical work on coherent control and Bose- Einstein condensation of excitons.
		We show that a coherent electromagnetic field is emitted and that condensation in a two-dimensional system can take place at finite temperatures.
		We consider particularly coherent control of the exciton density and spin and resonant Rayleigh scattering.
	www.stormingmedia.us /17/1774/A177483.html (231 words)

	Home Theater Forums at Audioholics - View Single Post - DTS-ES and no surround back speaker
		The other algorithm used by DTS, Coherent Acoustics, ((AaronB: i.e.
		Coherent Acoustics is the algorithm used for Home Theatre, which is different than the one used for Cinemas)) is highly scalable and can operate anywhere in the range 32 kbit/s to 4 Mbit/s.
		(The decoder population implements 5.1 channels.) Again contrary to popular assumption, Coherent Acoustics is not a perceptual coder at the data rates used on CD, LD, or DVD.
	forums.audioholics.com /forums/showpost.php?p=444&postcount=6 (250 words)

	Physics \| The WWW Virtual Library
		A Free Electron Laser generates tunable, coherent, high power radiation, currently spanning wavelengths from millimeter to visible and potentially ultraviolet to x-ray.
		It can have the optical properties characteristic of conventional lasers such as high spatial coherence and a near diffraction limited radiation beam.
		It differs from conventional lasers in using a relativistic electron beam as its lasing medium, as opposed to bound atomic or molecular states, hence the term free-electron.
	vlib.org /Physics (345 words)

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