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Topic: Equalisers

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	AudioMelody - Tutorials - How to Mix a Pop Song from Scratch (Site not responding. Last check: 2007-09-06)
		They are called "shelf" equalisers because of the shape of their frequency response when drawn on a graph.
		A pair of sweep equalisers is often found on some of the better-quality "portastudio" devices, as it allows a great deal of sonic control for relatively little cost.
		In fact a lot of the "smoothness" attributed to valve equalisers, often has little to do with the fact that they have valves in - it is instead due to the fact that the equaliser circuitry is passive rather than active.
	www.audiomelody.com /Tutorials/MixingStep7.htm (1458 words)

	M.Sc. Thesis
		The objective of this project is to investigate the alternative employment of recursive filter structures for equalisation of severely distorted channels, motivated by the achievements of conventional non-blind adaptive IIR filters.
		An equaliser architecture including a recursive structure is pursued by separating the equaliser into a cascade of a recursive prewhitening filter adapted with second-order statistics (SOS) and a phase equaliser adapted with HOS.
		Equalisation performance of the new algorithm is shown to be superior to block adaptive equalisers, even if the latter is implemented with an impractically large number of filter taps.
	www.phys.uit.no /~stiann/thesis.html (676 words)

	EQUALISERS EXPLAINED
		An equaliser is a processor which is designed to deliberately alter the tonal quality of audio passing through it.
		Such equalisers can only be found on high-end analogue consoles or within dedicated EQ modules, sometimes with the option to switch the outer bands between shelving and peaking modes.
		Cheap high-spec digital equalisers are powerful means of tonal adjustment, but it must be remembered that such devices rarely sound as musical as their analogue equivalents — hence the continuing demand by audio professionals for quality analogue equalisers such as those manufactured by Avalon, Focusrite, Millennia, Oram, and many others.
	www.soundonsound.com /sos/jul01/articles/equalisers1.asp (2415 words)

	Sound Performance Lab . Qure . in detail
		It is generally perceived that equalisers based upon constant-Q designs produce acoustically comparable results, and suffer from limitations in the areas of sound flexibility and musicality.
		Equalising with proportional-Q is therefore more intuitive and subjectively musical than with constant-Q equalisers.
		Tuning the equaliser is very intuitive because the frequency control law has been designed to match the characteristics of the human hearing system.
	www.spl-usa.com /Qure/in_detail.html (906 words)

	The Art of Equalisation (EQ) (Site not responding. Last check: 2007-09-06)
		In the early days of audio engineering, equalisation was referred to as a ‘means of correcting the frequency response of a device to prevent it from compromising the sound’.
		Graphic equalisers are the more visual of the two, with the volume sliders or knobs used to control the (fixed) frequencies arranged in order from left to right.
		On these equalisers, locating or ‘zeroing in on‘ a specific frequency entails adjusting each control in turn until the right one is found.
	www.mio.co.za /article.php?id=76 (697 words)

	WaveWarp Component Library-- Equalisers-- Brick-wall 8-band Equaliser
		If accurate equalisation is required, refer to the Digital Filters category of the Component Library.
		The attributes of the equaliser are adjustable via the Parameter Window, as summarised in the following table.
		The approximate "brick wall" equalisation is applied by dividing the FFT spectrum into 8 equal frequency bands, then multiplying the values in all FFT bins within each band by the gain for that band.
	www.soundslogical.com /support/wavewarp/documentation/english/documentparts/Brick_wall_8_band_Equaliser.html (528 words)

	Synopsis - Equalisers & EQ - audioEd Resources Site Learning Module
		Equalisers, in their simplest domestic guise, are the familiar home stereo tone controls - simple circuits designed to balance sounds in the frequency domain.
		In the recording environment, a different type of professional equaliser allows the engineer to "EQ the sound" by controlling the tonal balance of sounds as they are being recorded or mixed.
		This module examines the different equaliser types used by the sound production industry and provides an insight into their practical applications.
	www.audioed.com.au /secure/Platinum/module_synop/EQ1_synopPlat.html (247 words)

	Enforcing the Net - Internet and Comms Today Issue 6
		These "Net Equalisers" appear to be normal users on the surface; some run their own Talker systems, some are sysops, others are merely hackers who use the Internet in their spare time.
		One example of the Net Equalisers' actions is in the case of a janitor at an American university.
		Normally this would have been ignored -- the Equalisers are not concerned with enforcing their views on what is essentially the private pursuits of consenting adults -- and the sysop would have been left to his own devices.
	home.earthlink.net /~simoncooke/magazines/iact6art.html (2469 words)

	AudioControl DIVA Multi-Channel Equalizer Review [SMR]
		We often get asked questions about equalisers on the SMR Forums - which is the best to get, how to integrate them etc. The consensus reply usually is to consider first whether you really need one, then weigh the pros against the cons.
		Their Bijou 7 channel analogue equaliser is, I believe, one of only two equalisers certified by THX® for home theatre applications, then there is the highly regarded Rialto and their Richter Scale electronic crossover/equalizer/analyzer which has been around since the early 80s.
		Once in "equaliser mode" (activated by pressing the appropriate main function button), the control knob is used to select the frequency to be corrected, pressing the knob then puts the knob into adjust mode and the knob is rotated to dial in the required amount of cut or boost.
	smr-home-theatre.org /Reviews/diva (2246 words)

	Channel equalisers - US Patent 6636561 (Site not responding. Last check: 2007-09-06)
		The present invention provides a method whereby an adaptive equaliser is applied to the terminal (mobile) receivers in a cellular radio CDMA system whose purpose is to minimise the mutual interference between users sharing the same radio channel.
		Current proposals are to use a common front-end equaliser for the terminals which re-whitens the channel impulse response and remove this mutual interference.
		The digital processing load of a receiver equaliser has two parts: firstly the low-level digital filtering function work load at the chip rate and secondly the work load of the high-level real-time filter design algorithm which typically involves matrix manipulations which incur a heavy memory and instruction count.
	www.patentstorm.us /patents/6636561.html (5222 words)

	FIRST AMONG EQUALISERS?
		Applying excessive boost at one frequency may well cause the equaliser to run out of headroom and clip if the input signal level is high, but it can be useful to apply severe cut to reduce the effect of buzz, hum or other fixed frequency interference.
		While I wouldn't say a parametric equaliser is an essential studio accessory if you already have a desk with two sweep mids and possibly a spare graphic, it is still without doubt the most flexible and most powerful type of equaliser available.
		A parametric equaliser isn't an essential studio purchase if you already have, say, a desk with two sweep mids and possibly a spare graphic, but it is without doubt the most flexible and most powerful type of equaliser available.
	www.soundonsound.com /sos/1994_articles/jan94/tascampe40.html (1362 words)

	Digital equalizers and filters (Site not responding. Last check: 2007-09-06)
		The low shelving equaliser is used to boost or cut the bass frequencies.
		The high shelving equaliser works on the same principle as the low shelving equaliser, the only difference is that the DC gain stays constant and the high frequency gain varies.
		This means that if two parametric equalisers has the same centre frequency and Q-factor, a boost by the one can be totally cancelled out by the same amount of cut by the other one.
	mysite.mweb.co.za /residents/cyb00746/audiodocs/Digital_EQ.htm (1131 words)

	The Art of Equalisation (EQ)
		On parametric equalisers, the frequency controllers (knobs - no sliders on para’s) are far more versatile, and on good quality desks you’ll find in addition to the level knob, a frequency knob and a bandwidth or ‘Q’ knob.
		It is most common to find a ‘sweepable’ mid-frequency control in any of the possible configurations, so in a 3-band equaliser, the middle one is most likely to have a sweep and/or Q control associated with it.
		When working with parametric and sweep equalisers — whether you wish to cut or boost frequencies — it is best to turn the boost control to maximum and then comb (sweep) through the frequency range until you highlight the particular sound you wish to modify.
	www.mio.co.za /printpage.php?id=76 (1847 words)

	URS N, A & S Series
		Specifically, the centre or corner frequencies for these equalisers are stepped, rather than continuously variable, and the peaking EQ bands are not truly parametric: control over bandwidth (Q) is limited to a simple wide/narrow option in the N Series and is entirely absent from the A Series.
		In a world where so many digital equalisers sound cold and sterile, the warmth and colour of the A and N Series designs is a breath of fresh air, whilst S Series has all the smoothness and precision you could want.
		The DSP loads vary, but are low enough that you can afford to make these your default channel equalisers — you can load several URS EQ plug-ins even on a single Mix card DSP — yet their support for the Multishell architecture means you're not wasting a DSP chip by only using one instance.
	www.soundonsound.com /sos/sep04/articles/urs.htm?session=72eb09fcd5e131ab5cb49ed5103eba3a (1346 words)

	Practical Foundations of Mathematics
		Pullbacks and equalisers are unique up to unique isomorphism where they exist, cf Theorem 4.5.6.
		However, one should remember that this notation hides not only the projection maps (which were already absent from the product and exponential notations we have used) but also the maps f and g which are part of the data.
		The equaliser, if any, is the most general unifier (Remark 1.7.8), since any other unifier is a substitute.
	www.geocities.com /yury_bendersky/b/f/s51.html (1195 words)

	Construction Range
		Watch the marbles enter the equaliser, spin around, crash into each other and the racing order changes to give an exciting race to the finish.
		Contents: 1 start gate (2-piece), 1 finish, 2 equalisers, 4 bases, 12 small uprights, 4 medium uprights, 6 large uprights, 11 straights, 4 left curves, 2 right curves, 2 entries, 5 exits, 6 marbles, stickers.
		Contents: 1 start gate (2-piece), 1 finish, 3 equalisers, 5 bases, 12 small uprights, 15 medium uprights, 9 large uprights, 16 straights, 6 left curves, 6 right curves, 2 entries, 6 exits, 8 marbles, stickers.
	www.galt.co.uk /const/const01.htm (199 words)

	[No title] (Site not responding. Last check: 2007-09-06)
		The Comforts of Amnesia The Tribunal is opposed by "Legalists", "Equalisers", and "Pragmatists" by Dejan Anastasijevic and Philip Schwarm November/December 1996 The International Criminal Tribunal for the Former Yugoslavia (ICTY) has the potential to force a public examination of events that the Serbian government and many Serbs would prefer to forget.
		Milosevic's reluctance to deliver the three former Yugoslav army officers accused of mass killings in Vukovar has less to do with the risk of internal resistance, and more with the failure of Western powers to apply adequate pressure, or to offer a better price for their heads.
		The Equalisers are not organised into a pressure group, but they are by far the most numerous section of opinion, both among politicians on all sides and the so-called common people.
	www.iwpr.net /archive/trm/trm_06_199611-12_01.txt (814 words)

	Roland UK > Catalogue (Site not responding. Last check: 2007-09-06)
		The SRQ-2031 and SRQ-4015 Digital Graphic Equalisers both employ a unique interface, consisting of a Frequency Slider and rotary Dial Encoder, making the task of selecting specific frequencies and adjusting gain levels intuitive and simple.
		Since the SRQ-2031/4015 are digital, they are inherently free from the added noise and artefacts common among analog graphic equalisers.
		One of the primary advantages of using a digital graphic equaliser is the ability to instantly recall all EQ settings at the touch of a button.
	www.roland.co.uk /prodcatdetail.asp?id=SRQ-4015 (321 words)

	Multi-Level Radial Basis Function Network Based Equalisers For Rayleigh Channel - Yee, Hanzo (ResearchIndex)
		Decision feedback is introduced in the design of the RBF equaliser in order to reduce its computational complexity.
		The RBF Decision Feedback Equaliser (DFE) was found to give similar performance to the conventional mean square error (MSE) DFE over Gaussian channels using various Quadrature Amplitude Modulation (QAM) schemes, while requiring a lower feedforward and feedback order....
		Yee and L. Hanzo, "Multi-level radial basis function network based equalisers for Rayleigh channels," in Proc.
	citeseer.ist.psu.edu /yee99multilevel.html (348 words)

	Braun Audio - An Introduction into Audio Engineering - Equalisation & Equalisers.
		Shelving is the most common type of equalisation, generally utilised in good quality Hi-Fi's, fixed EQ pots on consoles (e.g.
		Peak-dip equalisation is the most common EQ characteristic used in studios.
		On most parametric equaliser this control is commonly known as the bandwidth control.
	home.iprimus.com.au /braunaudio/bodsec06.htm (1046 words)

	Talk Audio Forums - A Guide to Equalisers
		This post should give you some idea of the different types of equalisers, how they differ and what all the terminology means.
		A 1/3 octave equaliser has centre frequencies at every 1/3 of an octave, which means it has 30 bands in total (10 x 3/1).
		The idea of a parametric equaliser is generally that you have fewer bands but by being able to select centre frequencies and adjust Q you can get the exact effect you want.
	www.talkaudio.co.uk /vbb/showthread.php?t=67395 (3542 words)

	ICTs – the 21st century’s social equalisers (Site not responding. Last check: 2007-09-06)
		ICTs, according to Dr Gatt, are the social equalisers of the 21st century society – holding the power to bridge time-honoured economic, social, political and democratic gaps, unthinkable by traditional ways and means.
		Our policy in this respect is to customise the programmes developed in the other three elements and mould them together into initiatives that will positively impact the inclusion and the take-up of the information society by these divide-prone groups.
		This Government considers ICTs to be the social equalisers of the 21st century society.
	www.businesstimes.com.mt /2002/07/31/opinion.html (1542 words)

	[No title] (Site not responding. Last check: 2007-09-06)
		It is clear that E_kf is not closed under equalisers taken in E (!).
		Nevertheless, I think that E_kf itself does have equalisers : if f,g : X -> Y then take the equaliser e_0 of f_0 and g_0 and take the epi-mono-factorisation of x o e_0 : E_0 >---> X_0
		I would be interested in a reference or example where E_kf really is not a topos.
	www.neiu.edu /~hchen/read/cat1.html (324 words)

	Studio Equalisers @ Dolphin Music
		This unit without doubt possesses the finest combination of performance and affordability of any equaliser that we have yet produced.
		There is simply no equaliser in this price bracket to touch it: and now the 5013 features a peaking/shelving option on both LF and HF bands plus a ‘Fat’ contour switch on both channels.
		The EQ 1A is a full-range, one-channel equalizer featuring low and high cut, low and high shelving and three overlapping bands.
	www.dolphinmusic.co.uk /page/shop/browse/category_id/abf15c4f0712e191827ee9d2d7781950/a/m_manufacturer_id/e/186 (339 words)

	categories: charact. of absolute equalisers (Site not responding. Last check: 2007-09-06)
		Dear categorists, I wonder whether the following result is known: Call an equaliser in a category C absolute if it is preserved by all functors.
		Proposition: An equaliser e:A->B, u,v:B->C is absolute if and only if there are maps p:B->A, h1,h2,...hn:C->B such that pe=id, ep=h1 u h1 u = h2 v h2 u = h3 v...
		hn v = id Proof: An equaliser endowed with such maps is obviously preserved by any functor since whenever we have maps e,u,v,p,h1...hn such that ue=ve together with the equations listed above then e equalises u and v.
	north.ecc.edu /alsani/ct01(5-8)/msg00061.html (209 words)

	Edinburgh Research Archive : Item 1842/293
		Channel equalisers are used in digital communication receivers to mitigate the effects of inter symbol interference (ISI) and inter user interference in the form of co-channel interference (CCI) and adjacent channel interference (ACI) in the presence of additive white Gaussian noise (AWGN).
		An equaliser uses a large part of the computations involved in the receiver.
		Linear equalisers based on adaptive filtering techniques have long been used for this application.
	www.era.lib.ed.ac.uk /handle/1842/293 (192 words)

	Simply Stax: Equalisers > ED1 Monitor (Site not responding. Last check: 2007-09-06)
		STAX engineers with the help of Dr. Thaille from the Institute of Broadcast Technology (Insutitute fur Runtfunk-Technik) in Munich, developed a new equaliser based on an optimised equalisation curve developed using materials recorded on the Neumann KU-81i Dummy Head and played back through STAX Lambda Professional Earspeakers.
		A defeat (equaliser ON/OFF) switch lets the user bypass the equaliser circuitry as desired and is useful for testing equaliser effects.
		First, this and the other equalisers are specialised units and can only properly give of their best with specific Earspeaker models.
	www.simplystax.co.uk /heritage_product.html?prod_id=81 (586 words)

	RE: Adjustments to Equalisers using the keyboard not happening
		Also, there should be an option to save equaliser presets, as it is with Winamp.
		\par \par Also, there should be an option to save equaliser presets, as it is with Winamp.
		Adjustments to Equalisers using the keyboard not happening
	www.talkaboutsoftware.com /group/microsoft.public.windowsmedia.beta/messages/29705.html (185 words)

	Aerial and Satellite Amplifiers / Equalisers / Modulators
		Incorporates automatic sensing circuit which shuts down line Power in the event of a short circuit.
		These units will replace any passive channel equaliser already fitted or provide the necessary input leveling and filtering to an existing un-equalised headend.
		Allows level adjustment of the channel clusters and provides the essential filtering necessary to remove or minimalise out-of band signals.
	www.radnortech.com /Aerial/Amplifiers/AerialAmplifiersEqualisersModulators.html (258 words)

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