polyphase

Definitions

  • WordNet 3.6
    • adj polyphase of an electrical system that uses or generates two or more alternating voltages of the same frequency but differing in phase angle
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Webster's Revised Unabridged Dictionary
    • a Polyphase (Elec) Having or producing two or more phases; multiphase; as, a polyphase machine, a machine producing two or more pressure waves of electro-motive force, differing in phase; a polyphase current.
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Century Dictionary and Cyclopedia
    • polyphase In electricity, having components of various phase: referring to an alternating-current system in which several currents of equal frequency are used, which differ from one another in phase by a definite fraction of a period, as, in the three-phase system, three currents differing by one third period, in a quarter-phase system, two currents differing by one quarter period. Polyphase systems have the advantage of being better suited for power transmission and distribution than the single-phase system, and are therefore usually preferred. They require three or more conductors for transmission, and apparatus can be connected either between the different conductors of the system, or from the respective conductors to a common neutral conductor. In the former case the connection is called ring-connection, in the latter, star-connection, and the currents flowing in these respective connections ring-currents and star-currents. In the three-phase system, the ring-connection is usually called delta-connection, the star-connection Y-connection. The different circuits of polyphase apparatus may be designed for star- or for ring-connection, without essential change of their electrical characteristics.
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Etymology

Webster's Revised Unabridged Dictionary
Poly-, + phase,

Usage

In literature:

Her screens were monstrosities, double polyphase lattices that looked about as spacetight as so many sieves.
"The Lani People" by J. F. Bone
The general idea of the polyphase alternator giving two or more E.M.F.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 9" by Various
Both carry conductors in their slots, and these conductors in each case form a polyphase winding.
"The New Gresham Encyclopedia" by Various
Mr. Tesla's work ranges far beyond the vast departments of polyphase currents and high potential lighting.
"The inventions, researches and writings of Nikola Tesla" by Thomas Commerford Martin
Tesla's System of Polyphase Currents.
"The Progress of Invention in the Nineteenth Century." by Edward W. Byrn
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In science:

The IF signal bandwidth on the output of the polyphase low-pass filter is in range 1-11 MHz.
The multifrequency Siberian Radioheliograph
Since 2009, the survey has been recording data using the Jeff Mock spectrometers, which are polyphase filterbanks that provide better radio frequency interference rejection as well as increased bandwidth compared to the earlier WAPP survey data.
Four Highly Dispersed Millisecond Pulsars Discovered in the Arecibo PALFA Galactic Plane Survey
Waveforms that fall in the first category are for example polyphase sequences2, since they give rise to signals with low peak-to-average power ratio3 (PAPR). A low PAPR is desirable in the digital-to-analog conversion of signals, since signals with large PAPR would require expensive power amplifiers.
Accurate detection of moving targets via random sensor arrays and Kerdock codes
Polyphase sequences also have the advantage that they can be very convientiently implemented in hardware via simple look-up tables.
Accurate detection of moving targets via random sensor arrays and Kerdock codes
Quite a number of polyphase sequences, such as Alltop sequences or Kerdock codes, fall in this category.
Accurate detection of moving targets via random sensor arrays and Kerdock codes
Since Kerdock codes are polyphase sequences, they have excellent PAPR and they are easy to implement in hardware via a simple look-up table.
Accurate detection of moving targets via random sensor arrays and Kerdock codes
Since there is a one-to-one correspondence between Zq -valued and polyphase codewords, in the remainder of this letter, we shall drop the distinction between them.
Simple Maximum-Likelihood Decoding of Generalized First-order Reed-Muller Codes
From the discussion in Section II we know that a polyphase codeword x ∈ RMq (1, m) may be expressed as x = (w|w ξ i ), where w ∈ RMq (1, m− 1) and i ∈ Zq .
Simple Maximum-Likelihood Decoding of Generalized First-order Reed-Muller Codes
If {ψ (ν ) j k } is a tight frame and M is its polyphase matrix with polynomial entries, then, due to Suslin’s theorem and Lemma 10, there exist (r + 1) × (r + 1) polyν,k=0 , eN = {eµν k }r nomial matrixes N = {µν k }r ν,k=0 extending M such that N eN T = Ir+1 .
Multivariate Wavelet Frames
Now we will show that starting with arbitrary trigonometric polynomials satisfying (31), (32), it is possible to improve them such that the improved polynomials are polyphase representatives of a refinable mask generating a tight frame with V M n property.
Multivariate Wavelet Frames
Even greater channel densities may be achieved using polyphase filter banks or similar techniques.
Biasing and Demodulation Firmware for Kilopixel TES Bolometer Arrays
This is so called polyphase representation of trigonometric polynomial t.
On construction of multivariate symmetric MRA-based wavelets
If we change the set of digits, the polyphase components of trigonometric polynomial t will also change.
On construction of multivariate symmetric MRA-based wavelets
Thus, we need to reformulate symmetry conditions for the mask in terms of its polyphase components.
On construction of multivariate symmetric MRA-based wavelets
Let us reformulate axial symmetry conditions (43) for mask m0 in terms of its polyphase components.
On construction of multivariate symmetric MRA-based wavelets
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