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Topic: Polyphase

	Polyphase system - Wikipedia, the free encyclopedia
		The voltage on each phase is a sine wave, with a fixed time offset, or phase shift, between the phases.
		Polyphase power is particularly useful in AC motors, such as the induction motor, where it generates a rotating magnetic field.
		Polyphase motors are simple to construct, and are self-starting.
	en.wikipedia.org /wiki/Polyphase_system (520 words)

	Troy Corporation
		Polyphase 604 Polyphase 604 is a transparent, water dispersible liquid, non-metallic preservative for control of fungi and yeast in water based adhesives (glues), paints, water and tempera colors, inks, pigment slurries, clays and photographic emulsions.
		Polyphase EC17 Polyphase EC17 is a 17% emulsifiable concentrate, non-metallic, liquid preservative for control of yeast and fungi in aqueous and solvent-based adhesives, in antifoams, dyestuffs, print paste, spinning lubricant emulsions, polymer and latex coatings, thickeners, fabric softeners and other textile wet processing chemicals.
		Polyphase P100 is used to prevent the growth of fungi and mildew in press cakes and in fiber and yarn lubricants.
	www.chembuyersguide.com /partners/troycorp.html (6020 words)

	CD Baby: BIG FAT HEN: Polyphase (Site not responding. Last check: 2007-10-21)
		polyphase is the fifth cd produced by jason berger, in conjunction with members of big fat hen, which he founded in 1997, at age 17.
		polyphase is the evolution of jason's reggae/punk/ska roots, to his jazzy-funk/alternative-rock with touches of metal and latin flavor.
		Polyphase already has 2 CD's which you can hear or purchase "Atrophy" produced in 2004, and "Incision" their latest production released in September of 2005.
	www.cdbaby.com /cd/bigfathen03 (448 words)

	Polyphase Engineered Controls - Accreditation
		Polyphase Engineered Controls is certified to CSA 22.2 Standard for Industrial Control Equipment.
		Underwriters' Laboratories, Inc. was founded in 1894 to establish laboratories for the examination and testing of materials to determine their relations to the hazards to life and property.
		Polyphase Engineered Controls is certified to UL 508A Standard for Industrial Control Equipment.
	www.polyphasecontrols.com /pages/manu_accredit.html (179 words)

	World Intellectual Property Organization (Site not responding. Last check: 2007-10-21)
		A polyphase receiver as claimed in any one of claims 2 to 4, characterised in that amplifying means are coupled to inputs of the image rejection filtering means for adjusting the dynamic range of the quadrature related low IF signals for entry into the image rejection filtering means.
		A polyphase receiver as claimed in any one of claims 2 to 5, characterised by harmonic filtering means coupled between outputs of the soft limiting means and inputs of the signal demodulation means.
		A polyphase receiver as claimed in any one of claims 2 to 6, characterised in that the signal demodulation means comprises a polyphase discriminator and a data filter.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=01/39385.010531&ELEMENT_SET=DECL (2433 words)

	Polyphase system -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-21)
		Polyphase electrical systems supply (An electric current that reverses direction sinusoidally) alternating current (The product of voltage and current) electrical power in overlapping (Any distinct time period in a sequence of events) phases.
		The most common example are (Click link for more info and facts about three-phase power) three-phase power systems used in industrial applications.
		Polyphase power is particularly useful in (An electric current that reverses direction sinusoidally) AC motors, particularly the (Click link for more info and facts about induction motor) induction motor, where it generates a rotating (The lines of force surrounding a permanent magnet or a moving charged particle) magnetic field.
	www.absoluteastronomy.com /encyclopedia/p/po/polyphase_system.htm (580 words)

	Chapter 3
		Polyphase representation is, in simple terms, a method of re-organizing the coefficients of a given transfer function, h(n).
		By combining the polyphase representation and the noble identities, it is possible to implement more efficient analysis filter/decimator and expander/synthesis filter blocks of the form shown in Figure 12.
		Polyphase analysis and synthesis: (a) the direct polyphase implementation of an analysis filter and decimator, (b) the same implementation after invoking the noble identities, (c) the polyphase implementation of an expander and synthesis filter, and (d) the same implementation after invoking the noble identities (adapted from Vaidyanathan, 1993a).
	www.music.miami.edu /programs/mue/research/jvandekieft/jvchapter3.htm (2442 words)

	Encyclopedia: Polyphase quadrature filter (Site not responding. Last check: 2007-10-21)
		A polyphase quadrature filter, or PQF is a filter bank, which splits an input signal into a given number N (mostly a power of 2) of equidistant sub-bands.
		Similar to the MDCT time domain alias cancellation the aliasing of polyphase quadrature filters is canceled by neighbouring sub-bands, i.e.
		In statistics, signal processing, and related disciplines, aliasing is an effect that causes different continuous signals to become indistinguishable (or aliases of one another) when sampled.
	www.nationmaster.com /encyclopedia/Polyphase-quadrature-filter (714 words)

	Polyphase Corporation - Securities Class Action
		Polyphase Corporation et al., was filed in 1997 on behalf of a class of persons who purchased the Company's common stock between May 21, 1996 and June 17, 1997 (the 'Class Period').
		The original complaint alleges that Polyphase and certain of its officers and directors violated Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 as well as Nevada state common law for fraud and deceit and negligent misrepresentation by overstating the company's financial results for fiscal 1996.
		Conclusion: According to the Polyphase Corporation's FORM 10-K filed in the SEC for the fiscal year ended September 30, 2002, on June 5, 2002, the Ninth Circuit rendered a decision that affirmed several of the trial court's rulings, but reversed other rulings and remanded portions of the case for further proceedings in the District Court.
	securities.stanford.edu /1012/PLY97 (1367 words)

	Audio File Sample Rate Conversion
		Polyphase filtering is implemented by the "polyphase" special effect.
		The polyphase filter was much improved compared to the last test, the spectrum is flat up 3.7 kHz wich a sharp fall off of about 80 dB.
		The polyphase filter clearly has the best interpolation performance, closely followed by the bandlimited interpolation, both of them leaving linear interpolation far behind.
	leute.server.de /wilde/resample.html (1547 words)

	Polyphase networks
		Polyphase networks can be used in phasing type of SSB receivers and transmitters where they provide the required audio phase shifting function.
		Interest from the seventies and the nineties for these Polyphase networks have revived since Dan Tayloe got a patent on the commutating detector.
		I build a circuit that used a 5 segment Polyphase network and MC1496 balanced modulators to compare practice to theory.
	home.planet.nl /~niess153/Polyphase_networks.htm (202 words)

	Polyphase reference generator - Patent 4327420
		For example, in an electric vehicle, a polyphase (typically three-phase) AC generator may be utilized to excite a motor providing power to the driven wheels; selection of vehicle forward and reverse directions is controlled by the phase relationship of the polyphase driving waveforms.
		The polyphase reference generator utilizes a single-chip integrated circuit microcomputer 11, which includes a read-only memory (ROM) 11a, an accumulator register 11b, a programmable timer (or counter) register 11c and additional addressable registers, e.g., illustratively 7 addressable registers 11d-11j, sequentially numbered as registers 1-7.
		It should also be understood that the polyphase reference generator may be implemented utilizing hard-wired logic for controlling digital data flow between an array of registers utilized in conjunction with a timer and a clock oscillator, to provide the equivalent of microcomputer 11, although at somewhat increased cost and physical volume.
	www.freepatentsonline.com /4327420.html (4952 words)

	A Group-Delay Interpretation of Polyphase Filters (Site not responding. Last check: 2007-10-21)
		To be able to view the math in this document, use the PDF version, or please consider using another browser, such as Mozilla, Netscape 7 or above or Microsoft Internet Explorer 6 or above (MathPlayer required for IE).
		Previously, polyphase interpolation and decimation were derived from the Noble identities and motivated for reasons of computational efficiency.
		The L polyphase outputs are then interleaved to create the output stream.
	cnx.rice.edu /content/m10438/latest (260 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		Polyphase filters allow observation of a multitude of channels simultaneously without the necessity of a matched filter for each channel.
		POLYPHASE FILTERS Humans might attend to two or maybe three channels of information at once Computing machines are, in effect, capable of observing many things at once within the limits of processing speed, bus speed, data access time, and so forth.
		The polyphase filter is a special sort of digital filter in which one filter does the work of many.
	www.rsl.ku.edu /~bryson/EECS844/PolyphaseFiltersmod.doc (6937 words)

	Polyphase motor design - Chapter 10: POLYPHASE AC CIRCUITS - Volume II - AC (Site not responding. Last check: 2007-10-21)
		As we studied in the first chapter of this book, some types of AC motors are virtually identical in construction to their alternator (generator) counterparts, consisting of stationary wire windings and a rotating magnet assembly.
		Polyphase AC motors require no such trickery to spin in a definite direction.
		Polyphase motors don't need such measures; their direction of rotation is fixed by the phase sequence of the voltage they're powered by.
	www.allaboutcircuits.com /vol_2/chpt_10/4.html (1033 words)

	ELSTER :::: POLYPHASE METERS :::: Electricity, Water and Energy Meters, Metering Systems, Load Control Solutions
		The ALPHA meter is a solid state, polyphase electronic meter and register that collects, processes, and stores energy use and demand data.
		The ALPHA Plus® meter is a totally electronic polyphase electricity meter and integral register that collects, processes, and stores energy use and demand data on either a single rate or time of use (TOU) basis.
		The Elster Polyphase meter single disk technology, the total quality concept at every level of the manufacturing process and the right selection of materials, make that the characteristics of these meters remain unaltered in the most adverse operational environmental conditions.
	www.elstermetering.com /en/726.shtml (1034 words)

	Spartan News © Spartan Chemical Company, Inc 1999 (Site not responding. Last check: 2007-10-21)
		Troysan Polyphase LA-33 is an effective broad spectrum, low odor liquid preservative designed to inhibit the growth of fungal microorganisms in water dilutable metalworking fluids.
		Troysan Polyphase LA-33 should not be added directly to other biocides during the tankside addition process.
		Troysan Polyphase LA-33 is available in 5 gallon pails and gallons, 4 per case.
	www.spartanchemical.com /web/products.nsf/DocId/37EC7C6135B4824D852569420053F6A2?OpenDocument (247 words)

	VLSI Digital Circuits (CSE 477) (Site not responding. Last check: 2007-10-21)
		In the simulation result, peak power consumption of polyphase implementation is bigger than direct implementation because polyphase implementation uses two more synchronous reset flip flops.
		But average power consumption of polyphase implementation is lesser than direct implementation because polyphase implementation operates at the half speed of direct implementation.
		The size of polyphase implementation is bigger than direct implementation because of two more synchronous reset flip flops.
	www.cse.psu.edu /~joolee/CSE477/final.htm (603 words)

	Polyphase
		Polyphase Filters are used in single sideband receivers, generators, and many other ways.
		Polyphase in this sense is used to describe analog or digital networks that have N inputs and N outputs.
		Polyphase Modem for Frequency Division Multiplex by D.R.Barber and M.J.Gingell Electrical Communication Magazine, Vol.
	users.vnet.net /gingell/polyphas/polyphas.html (718 words)

	Low power Comb Decimation Filter Using Polyphase Decomposition For Mono-Bit Analog-to-Digital Converters - Dumonteix, ... (Site not responding. Last check: 2007-10-21)
		Polyphase decomposition in all stages with high decimation factor in the first stage, are used to reduce the frequency of the input signal.
		Several implementations have shown that proper choice of the decimation factor of the first stage can reduce power consumption by more than 30% The multistage architecture makes the total decimation factor easily programmable and suitabale for...
		Low-power comb decimation filters using polyphase decomposition for mono-bit sigmadelta analog-to-digital converters.
	citeseer.ist.psu.edu /dumonteix00low.html (481 words)

	Evaluation of the Efficiency of Fractional Polyphase Motors: Executive Summary
		Over the last decade and a half, energy efficiency advocates have achieved significant success working with regulators and equipment manufacturers to transform the market for integral-horsepower (hp), polyphase motors—the workhorses of industry.
		These motors are produced in both single and polyphase configurations, and are ubiquitous in commercial and industrial applications, from small pumps and fans to compressors and conveyors.
		From this analysis we can conclude that significant differences exists in the efficiency level for fractional polyphase motors, and that the savings from the more efficient products would result in significant energy savings in applications with high operating hours.
	www.aceee.org /Motors/frmtrs.htm (923 words)

	[music-dsp] polyphase IIR downsampling (Site not responding. Last check: 2007-10-21)
		I need to do a 2:1 downsample for some lower rate processing on a 56k DSP, and a polyphase IIR would be the right fit.
		But, that's a pain and the job doesn't warrant the time and testing, so I was hoping to find an "off the shelf" design that fits--with pre-computed coefficients or a coefficient calculator.
		I looked at the musicdsp.org archives and found the polyphase IIR source code there, including coefficients: http://musicdsp.org/archive.php?classid=3#39 So, I could use those coefficients (of course as far as the code, I'd pre-decimate the paths and drop the filter orders to one).
	shoko.calarts.edu /pipermail/music-dsp/2004-September/028287.html (221 words)

	CommsDesign - RF Engines starts licensing Polyphase DFT cores as IP (Site not responding. Last check: 2007-10-21)
		Dubbed the Ventrix range, the core is intended for applications where filter performance and processing speed are critical and optimal use of the available silicon is required.
		The Polyphase DFT cores are pipelined for maximum data throughput and, according to the company, provide significantly better filter performance compared with weighted FFT techniques, giving better in-band ripple, stop-band rejection and roll-off.
		The highly optimised pipelined polyphase core incorporates RF Engine's FFT core, and there are versions from eight to over 1 million points.
	www.commsdesign.com /showArticle.jhtml?articleID=12804076 (446 words)

	TechOnLine - A Modified Polyphase Transform with Embedded Fractional Sample Rate Change (Site not responding. Last check: 2007-10-21)
		287 KB We describe and illustrate receivers employing modified N-path polyphase filters that allow resampling by arbitrary ratios while simultaneously baseband aliasing from center frequencies at Nyquist zones that are not multiples of the output sample rate.
		The technique described here uses a circular input buffer to couple between the input data array and the polyphase filter weight sets and a circular output buffer to couple between the polyphase filter outputs and the phase rotators of the FFT.
		A number of applications of multi-channel filter banks are presented that illustrate use of the polyphase filter bank and FFT to obtain rational ratio resampling between input and output sample rates along with translations to and from arbitrary center frequencies unrelated to output sample rates.
	developonline.com /community/tech_group/analog/tech_paper/34059 (199 words)

	Peerless ELectic Polyphase Motors
		Polyphase squirrel cage induction motors are designed for across the line or increment starting as desired.
		This type of motor is extremely rugged and reliable, providing most satisfactory performance for constant speed applications.
		Peerless Electric also designs polyphase induction motors and motor parts for variable speed applications in conjunction with many SCR drives on the market today.
	www.peerlesselectric.com /polyphase.htm (216 words)

	On Achieving Micro-dB Ripple Polyphase Filters with (ResearchIndex) (Site not responding. Last check: 2007-10-21)
		Abstract: This paper reports on the establishment of the coefficient bounds for half-band fixed-point polyphase filters, having all their zeroes on the unit circle.
		Potential applications as well as sample filters, designed through the use of these bounds are also reported.
		Polyphase IIR Filter Banks for Subband Adaptive Echo..
	citeseer.ist.psu.edu /650854.html (285 words)

	Research Group Polyphase Solidification at DLR/Space Simulation (Site not responding. Last check: 2007-10-21)
		In the moment we concentrate one part of our research efforts on the solidification of monotectic alloys, since they are nearly ideal materials for advanced baerings in engines of all kind.
		All experimental research on polyphase solidification is performed in the earth lab and under reduced gravity conditions offered for instance by airplanes, sounding rockets or the Space Shuttle.
		Using modern techniques of light and electron microscopy, local material analysis, digital image analysis we try to quantify the microstructure in (directionally) solidfied or cast samples, such that a correlation to and a comparison with mathematical models is possible.
	www.kp.dlr.de /WB-RS/Erstarrung/erstarrung_welcome_eng.html (376 words)

	US PATENT SUBCLASS 336 / 5-- POLYPHASE (Site not responding. Last check: 2007-10-21)
		The claims must limit the device to use in a polyphase system by including some structure or electrical connection which is not of general utility but is specifically for use in a polyphase system to be classified herein.
		The search should extend to the appropriate subclasses below for inductor structure which may be used with polyphase current but which is of generally utility (e.g., multiple coil reactors and transformers with plural primary and secondary windings).
		The single source of supply may be a polyphase source.
	www.patentec.com /data/class/defs/336/5.html (227 words)

	RFEL IP Cores - Polyphase DFT's
		The Polyphase DFT, sometimes referred to as the WOLA (Weighted OverLap and Add) is an efficient method used to implement a uniformly distributed multi-channel filter bank.
		The architecture consists of a polyphase front-end that performs the weighting, overlapping and addition followed by a DFT that is usually implemented using an FFT.
		The Polyphase DFT is generally used in applications that demand high quality filters in terms of stop band rejection and filter shape.
	www.rfel.com /products/Products_polydft.asp (240 words)

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