
	Where results make sense

Topic: Crest factor

Related Topics

Falcon Crest

Great Crested Grebes

Red crested Pochard

Lesser Crested Tern

Crested Lark

Pacific Crest Trail

Greater Crested Tern

Double crested Cormorant

Crested Shelduck

Crested Tit

Crested Butte, Colorado

Crested Goshawk

In the News (Fri 1 Jun 12)

EXECUTIVE POWER

Iran

ANALYSIS

Pakistan

Family compact

	Crest - Wikipedia, the free encyclopedia
		Crest (hydrology), in hydrology, the highest level above a certain point (the datum point, or reference point) that a river will reach in a certain amount of time.
		CREST syndrome is a limited form of the disease scleroderma.
		Crest, California is an unincorporated community located in San Diego County, California.
	en.wikipedia.org /wiki/Crest (270 words)

	msinclip (Frequency Domain Identification Toolbox)
		Minimize crest factor of multisine using the clipping algorithm.
		iterates towards an optimum set of phases for which the crest factor of the multisine with the given amplitudes (or the larger of the crest factors of the two multisines at the input and the output of a linear system) is minimum.
		is the crest factor of the generated multisine, calculated with the given oversampling factor.
	www.tau.ac.il /cc/pages/docs/matlab/help/toolbox/fdident/msinclip.html (825 words)

	HAMILTON & DISTRICT BUDGERIGAR & CAGE BIRD SOCIETY INC. (Site not responding. Last check: 2007-11-02)
		Crested budgies were produced in Canada and China beginning in the thirties and are still bred today: England even has a special club for crested budgie breeders.
		As far as is known all types of crests are governed by the same factor, which is dominant and doubled with a 48% lethality in the embryonic state.
		Feather crests are formed by a swirl at the root of the feathers, forcing the feather to grow upward and sideways instead of in layers as in normal plumage.
	www3.sympatico.ca /davehansen/crest.html (1252 words)

	Crest: A Subvital Character in the Budgerigar
		It is already a well known fact that the crest factor sometimes is lethal and sometimes it is not.
		The development and appearance of the crests is dependent on four different components: abnormal position of the feather follicles on the head, the rapid growth rate of these feathers, the number of featherfollicles involved and, the genetical makeup of the bird.
		Characteristics of this hereditary factor, as the high number of break-throughs, the change in dominance and, the variable degree of expressivity of certain phenes, are discussed.
	www.euronet.nl /users/hnl/crested.htm (1216 words)

	Sizing A UPS System
		The reduction in crest factor is a predictable and repeatable result whenever switch-mode power supplies are used with power sources that have inductive reactance in series with the switch-mode power supply.
		The reduction in crest factor is accomplished by changing the shape of the switch mode's input current waveform to a wider shape with less amplitude.
		Crest factor is dependent on the application and must be used with caution as an inverter sizing criterion.
	www.solidstatecontrolsinc.com /techhpapers/papers/sizingnonlinear.html (2214 words)

	HighBeam Encyclopedia - crest (Site not responding. Last check: 2007-11-02)
		CREST [crest] in feudal livery, an ornament of the headpiece that afforded protection against a blow.
		The crest came to be used in heraldry, first only by persons of high rank, then by all those entitled to a coat of arms.
		The lion, used by Edward III of England, remains the crest of the English sovereigns.
	www.encyclopedia.com /html/c1/crest.asp (365 words)

	Bimodal functions of Notch-mediated signaling are involved in neural crest formation during avian ectoderm development ...
		Neural crest is induced at the junction of epidermal ectoderm
		in Xenopus that neural ectoderm, neural crest and epidermis
		is downregulated in the neural crest of avian embryo, and misexpression
	dev.biologists.org /cgi/content/full/129/4/863 (6120 words)

	How to Measure Power Factor
		Power factor is defined by IEEE and IEC as the ratio of true power to apparent power: PF = W/VA. Power factor takes into account both the phase and wave-shape contributions to the difference between true and apparent power.
		Crest factor, another measurement often used when describing these waveforms, is defined as the ratio of peak to rms current.
		For this type of power-supply current waveform, a crest factor of 3 is common.
	www.evaluationengineering.com /archive/articles/0903power.htm (862 words)

	Low Frequency and DC Measurement Fundamentals - Tutorial - Developer Zone - National Instruments
		Crest factor is an important parameter to understand when trying to take accurate low frequency signals.
		For a sine wave, the crest factor is 1.414; for a 50% duty cycle square wave, the crest factor is 1.
		is insensitive to crest factor error and capable of low-level measurements, limited primarily by noise.
	zone.ni.com /devzone/conceptd.nsf/webmain/13F1C5AEC86D0C6486257013005B1B6F?opendocument&node=dz00000_us (1544 words)

	Speaker power handling < Pro-Audio References
		This is determined by the ratio of the peaks (crests) to the average level of the signal.
		It specifies a 6 dB crest factor pink noise signal, with a bandwidth of one decade.
		The signal is also 6 dB crest factor pink noise signal, but with programme filtering that is different to the IEC standard and is also shown on the previous illustration.
	www.doctorproaudio.com /doctor/temas/powerhandling.htm (1151 words)

	Choosing the Right Audio Amp for Cell Phones
		Crest factor is defined as the ratio of a signal's peak to root-mean squared (RMS) value.
		Therefore, using the same 2-W amplifier and factoring in an audio signal with a 15-dB crest factor, the average output power is reduced to 63 mW.
		The crest factor of an audio signal changes the average output power of the amplifier for both Class-AB and Class-D amplifiers.
	www.commsdesign.com /printableArticle?articleID=53700979 (1990 words)

	Home Theater Forum - The "designing the perfect subwoofer driver" thread...
		A common signal is pink noise with a 6dB crest factor.
		This means [B]IF[/B] you knew that you would always maintain a crest factor in your program material of 6dB, and you never went past the peak limits of the amplifier, you could use an amplifier with peak output of 1000W on a "250W" speaker.
		As you clip an amplifier, the distortion and clipped peaks hugely reduce the crest factor to near zero, and greatly increasing the average power.
	www.hometheaterforum.com /htforum/printpost.php?postid=765968 (813 words)

	Template for client documents
		The ratio of Vpk to Vrms is the crest factor.
		The crest factor for a pure sine wave is 1.414, and an average-responding meter can provide accurate rms simply by scaling the value of Vpk.
		Its 7+ crest factor means that the peak value is more than seven times greater than the rms value.
	www.evaluationengineering.com /archive/articles/0299dmm.htm (2118 words)

	Uniform Pulse Start System (Venture Lighting International)
		These innovative, reduced current crest factor ballasts combine with the unique formed body arc tube lamp to provide the longer life, higher lumen output, quicker starting and better efficacy our customers demand.
		The current crest factor is only 1.4 to 1.5, resulting in excellent lumen maintenance.
		With the reactor ballast, the ratio of the peak current to the average current delivered, known as current crest factor, is approximately 1.4 to 1.5.
	www.aecinfo.com /1/resourcefile/00/32/90/advnc06.htm (592 words)

	High-power electronic ballast, curing UV lamps, water and air disinfection - www.uvelectric.com (Site not responding. Last check: 2007-11-02)
		Current crest factor (crest factor defined as a ratio between the peak and the rms value) is approximately 1.7.
		The absence of cycle-bycycle reignition and the unity current crest factor is the optimal condition for minimizing electrode wear and extending lamp life.
		Cycle-by-cycle reignition, normal with 50/60 Hz operations, and the high current crest factor, 1.7 or lower in conventional ballasts and higher with SCR controlled ballasts, are detrimental for lamp life.
	www.uvelectric.com /white.php (2315 words)

	Multitone Signals with Low Crest Factor
		However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
		After an introductory discussion of real-valued and complex signals, it is shown that minimizing the crest factor (CF) of multitone signals is closely related to the construction of complex sequences with low sidelobes in their aperiodic autocorrelation function.
		Inspired by this observation, a lower bound on the achievable CF is derived.
	www.comsoc.org /comm/private/1997/oct/1338_45comm10-friese.html (467 words)

	ProSoundWeb \| EPR pg. 1
		The crest factor of an audio signal is the dB difference between the peaks and the RMS value of the signal.
		A low crest factor signal will deliver more power (and more heat) to a loudspeaker than a high crest factor signal, even though both are played over the same amplifier.
		Since a voltage waveform has a crest factor (in dB), this value is useful in determining the appropriate amplifier size for a given loudspeaker and desired level.
	www.prosoundweb.com /install/synaudcon/news27_1/epr_p1.shtml (560 words)

	Neural crest patterning: autoregulatory and crest-specific elements co-operate for Krox20 transcriptional control -- ...
		of Krox20 expression in the migrating neural crest.
		Expression in the neural crest and rhombomeres 3 and 5 are indicated (arrowheads).
		Role of the isthmus and FGFs in resolving the paradox of neural crest plasticity and prepatterning.
	dev.biologists.org /cgi/content/full/130/5/941 (7940 words)

	SwRI: Advanced algorithms, demonstration systems for digital predistortion; consulting, assistance in subsystem ...
		Nonlinear compensation is often what is meant when the term digital predistortion is used, however digital predistortion can also include memory effects compensation, linear compensation, and crest factor reduction.
		Non-linear compensation is a method of digital predistortion, where each sample of the base-band input signal is adjusted for the magnitude and phase distortion based on the instantaneous power level of that sample.
		SwRI has developed crest factor reduction algorithms that reduce the peak to average power ratio of multi-carrier signals while minimally impacting the integrity of the signals.
	www.swri.org /4org/d10/comm/commeng/digitalp.htm (445 words)

	Marc's Technical Pages: Power Quality Symptoms and Solutions - Crest Factor
		Let's be kind and settle for an average and work on a crest factor of 2.
		But, using the crest factor we have just settled on means his peak currents are 8A.
		What was unknown to him was the instrument used during the "before and after" comparisons had a problem with the crest factor on the "before" portion.
	www.marcspages.co.uk /pq/5102.htm (774 words)

	ECS EPrints Service - Crest-Factor Study of MC-CDMA and OFDM
		The crest factor (CF) of M-ary PSK MC-CDMA systems is shown to be dependent upon the aperiodic cross-correlations as well as on the aperiodic autocorrelations of the spreading codes used.
		Based on this observation, the crest factor distributions of BPSK MC-COMA using two different binary orthogonal spreading sequences namely Walsh codes and orthogonal Gold codes - as well as two polyphase orthogonal sequences - Frank codes and Zadoff-Chu codes - are compared.
		MC-COMA using Walsh codes was found to exhibit a peak factor reduction of 1.5 over OFDM, when the number of subcarriers Is 16 and a rate 15/16 CF reduction block code Is used, while maintaining the same spectral efficiency.
	eprints.ecs.soton.ac.uk /7172 (315 words)

	Programmable Power Supply Products - LD Series (Site not responding. Last check: 2007-11-02)
		The ability to simulate high crest factor and variable power factor AC load conditions provides an effective method of testing these and other AC products against real-world conditions and can significantly increase product reliability.
		When operating in constant current or constant power mode, the 3091LD supports crest factor control by narrowing the conduction angle of the current waveform in order to match the requested crest factor.
		Consequently, as crest factor is increased, the power factor automatically decreases.
	www.calinst.com /ldseries.html (1022 words)

	PETCRAFT - THE CRESTED BUDGERIGAR
		The three crest phenotypes are manifestations of the interactions of two genes:crest-determining, D, and crest-initiating, I. The corresponding wild, normal, gene is designated by the plus symbol, +.
		The notation for the genotype of the one-half crested is I/+ D/D. A bird that has two crest-initiating genes and either one or two crest-determining genes is a full crest.
		The continued pairing of crest to crest is not to be suggested.
	www.petcraft.com /docs/crestedkeet.shtml (840 words)

	Live Sound International \| Power Lines: More About Transfer Between Amps & Transducers
		Assuming a crest factor of 10 dB, the amplifier would have to have a peak rating of 1,000 watts (sine rating of 500 watts) to actually deliver 100 watts into a resistive load.
		Once you factor in all of the variables (I won’t do it here), the crest factors in live performance are often in the 6 to 10 dB range for mid and high frequencies.
		Also remember that compressors and limiters reduce the crest factor of the signal, which means that more power is delivered to the load.
	www.livesoundint.com /archives/2003/april/flow/flow.php (2048 words)

	SNAI2 - Genetics Home Reference
		On the basis of this action, the protein is called a transcription factor.
		Research indicates that the snail 2 protein is required during embryonic growth for the development of cells called neural crest cells.
		Neural crest cells migrate from the developing spinal cord to specific regions in the embryo and give rise to many tissues and cell types such as limb muscles, bones in the face and skull (craniofacial bones), some nerve tissue, and pigment-producing cells called melanocytes.
	ghr.nlm.nih.gov /gene=snai2 (668 words)

	AC Voltage RMS Measurements - Tutorial - Development Library - National Instruments
		For example, given a certain digital multimeter with an AC accuracy of 0.03% (always specified for sine waves) with an additional error of 0.2% for crest factors between 1.414 and 5, then the total error for measuring a triangular wave (crest factor = 1.73) is 0.03% + 0.2% = 0.23%.
		The method used by the NI 4070 Digital Multimeter is insensitive to crest factor error and capable of low-level measurements, limited primarily by noise.
		So while the specification allows for signal amplitudes of 1% of range, in practice the useful measurement range extends at least a decade lower.
	zone.ni.com /devzone/conceptd.nsf/webmain/7D38C6930EC99FAB86256E0F00778F81?opendocument&node=DZ52279_US (1364 words)

	Advanced Single-Stage Power Factor Correction Techniques
		The average lamp current control with duty ratio modulation is developed so that the lamp operates in constant power with a low crest factor over the line variation.
		The unity power factor condition and principle of operation are analyzed.
		The average lamp current control with switching frequency modulation is developed, so the developed electronic ballast operates in constant power, low crest factor.
	scholar.lib.vt.edu /theses/OAI/cgi-bin/index.pl?verb=GetRecord&identifier=oai:VTETD:etd-9897-165556&metadataPrefix=oai_dc (516 words)

	Home Recording dot com BBS - crest factor for mix and individual instruments
		Home Recording dot com BBS - crest factor for mix and individual instruments
		The Crest Factor is the difference between the average level and the peak.
		What is a good crest factor to attempt to achieve for a whole mix?
	homerecording.com /bbs/showthread.php?t=42809 (167 words)

	Crest Factor
		Note in the curve enlargement (above, right) that the music highest levels are flat and do not build up much power, that is, they are distorted.
		This is the same previous musical curve, this time limited by the Crest Factor system, assessing the musical peaks from the musical program integration.
		PlugandPlay Studio R modules with crossover, the Crest Factor limiter can be set by the rotary control located to the left on the module back panel, with graduation in %.
	www.studior.com.br /english/cfactor.htm (606 words)

	SignalExpress - Repeat Until High Crest Factor Found - Example - Development Library - National Instruments
		The Formula step is also used to find the positive and negative crest factors of the signal.
		The steps are repeated until either the positive or negative crest factors exceed a designated threshold value.
		Formula - Executes a user-defined formula that calculates the crest factor, where crest factor = peak/rms.
	sine.ni.com /apps/we/niepd_web_display.display_epd4?p_guid=F6DE26F0D8D36B61E0340003BA7CCD71&p_node=201949&p_source=external (220 words)

Try your search on: Qwika (all wikis)