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properties of discrete time fourier transform ppt

Các phương pháp xử lý tín hiệu dùng bộ lọc, phương pháp Fourier Transform, STFT(  Short Time Fourier Transform)

Các phương pháp xử lý tín hiệu dùng bộ lọc, phương pháp Fourier Transform, STFT( Short Time Fourier Transform)

Y khoa - Dược

... Trong miền tần số: phương pháp Fourier Transform. - Trong miền thời gian và tần số: STFT( Short Time Fourier Transform) . 2.4.1. Phương pháp Fourier: 2.4.1.1. Biến đổi Fourier: Cho một hàm f(t) ... kết thúc của sự kiện thì Fourier không phát hiện được. 2.4.2. Phương pháp STFT: Để đạt được một biến đổi Fourier cục bộ, chúng ta có thể định nghĩa một biến đổi Fourier cửa sổ. Tín hiệu đầu ... đổi Fourier của nó được định nghĩa: () () ()tfedtetfFtitj,ωωω ==∫∞∞−− (2.14) Biến đổi Fourier ngược là: () ()∫∞∞−= ωωπωdeFtftj21 (2.15) Giả sử rằng biến đổi Fourier...
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06 Quantization of Discrete Time Signals

06 Quantization of Discrete Time Signals

Cơ khí - Chế tạo máy

... infinite set of possible signals is converted into a finite set. The next step of encoding maps thefinite set of discrete time, continuous amplitude signals into a finite set of discrete time, discrete amplitude ... as its domain. A discrete time, continuous amplitude signalhas R as its range. A discrete time, discrete amplitude signal has Z as its range. Here, the focus ison discrete time signals. Quantization ... discrete time signals. Quantization is the process of approximating any discrete time, continuousamplitude signal into one of a finite set of discrete time, continuous amplitude signals based on aparticular...
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Tài liệu Báo cáo khoa học: Binding of ligands originates small perturbations on the microscopic thermodynamic properties of a multicentre redox protein pptx

Tài liệu Báo cáo khoa học: Binding of ligands originates small perturbations on the microscopic thermodynamic properties of a multicentre redox protein pptx

Báo cáo khoa học

... infavour of a specific binding of phosphate to cyto-chrome c3[23] instead of a simple electrostatic effect of increased ionic strength at least up to 0.2 m concen-tration. The region of positively ... approximation of the redox centres of the donor and acceptor, and thatthe reduction potentials ensure a favourable drivingforce, which is one of the main determinants of therate of electron ... Experimental measure-ments of the reduction potentials of proteins involvedin complexes have been reported [5–7], but the effect of partner binding on the microscopic properties of theredox centres...
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Báo cáo

Báo cáo " Influence of intradot Coulomb interaction on transport properties of an Aharonov-Bohm interferometer " ppt

Báo cáo khoa học

... equation of motion approach, we haveinvestigated the electronic transport properties of an Aharonov-Bohm (AB) ring in the presence of a magnetic field with a quantum dot inserted in one arm of the ... for the ring-dot using the equations of motion method [17]. The equations of motion method of the dot Green function gives rise to an infinite order system of higher-order Green functions. Anapproximation ... system of equations, thus producing the closed set of equations. To do the truncation, we approximate the Green functions up to the second order of U. This truncation ensures that most of the...
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RISK PROPERTIES OF AMU DENOMINATED ASIAN BONDS pptx

RISK PROPERTIES OF AMU DENOMINATED ASIAN BONDS pptx

Ngân hàng - Tín dụng

... Hi-Stat Discussion Paper Series No.45 Risk Properties of AMU denominated Asian Bonds Junko Shimizu and Eiji Ogawa November 2004 ... Research Unit for Statistical Analysis in Social Sciences A 21st-Century COE Program Institute of Economic Research Hitotsubashi University Kunitachi, Tokyo, 186-8603 Japan http://hi-stat.ier.hit-u.ac.jp/...
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Báo cáo khoa học:

Báo cáo khoa học: "ON THE SUCCINCTNESS PROPERTIES OF UNORDERED CONTEXT-FREE GRAMMARS" ppt

Báo cáo khoa học

... polynomiaUy bigger than the size of a grammar for the language itself. The proof of this claim rests on inspection of one of the standard proofs, say Hopcroft and Ullman [5]. The result is ... The number of strings in A is less than or equal to the number of ways of selecting one of the u strings. Consider the u string to the left of the boundary which z overlaps. Because of wraparound, ... f~(cn). Proof. This proof is really just a generalization of the proof of Theorem 1. It uses, however, the Q subsets in a way that the proof of Theorem 1 does not. First, we drop the n subscript...
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The Estimation of Mechanical Properties of Polymers from Molecular Structure ppt

The Estimation of Mechanical Properties of Polymers from Molecular Structure ppt

Kĩ thuật Viễn thông

... and cost-in short, the engineering properties of a material. Other properties may be of importance, but, if a polymer does not have a balance of these properties, its chances for commercial ... Krevelen, Properties of Polymers, Their Estimation and Correlation with Chemical Structure, Elseview, New York, 1976, p. 303. 25. D. W. Van Krevelen and P. J. Hoftyzer, Properties of ... ASTM D638. ESTIMATION OF MECHANICAL PROPERTIES OF POLYMERS 1343 Data calculated Temperature, K Figure 9 Tensile modulus of polystyrene as a function of temperature. 1. Shear...
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Báo cáo toán học:

Báo cáo toán học: " Some certain properties of the generalized hypercubical functions" ppt

Toán học

... degrees of freedom k and n,we generalize it from discrete to continual [1,2]. In addition, we can advance from thefield of the natura l integers o f the dimensions–degrees of freedom of cube ... 2011:60http://www.advancesindifferenceequations.com/content/2011/1/60Page 8 of 14 comes down to zero. The greatest values of the considered functions are infinite, whenk0= ∞.2.7. The first derivatives of the ch1 function of HC in relation to the degree of freedom ... 2)ψ2(υ +1)+ψ4(k + n − 2).In general, the HC of the mth derivative of n can be defined on the basis of the pro-duct of polygamma (psi) polynomial of the mth degree and HC. Its general form is...
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Báo cáo hóa học:

Báo cáo hóa học: " Preparation and properties of copper-oil-based nanofluids" ppt

Hóa học - Dầu khí

... conductivities of nanofluidsThe effects of both temperature and mass fraction of thenanoparticles on the viscosities of the nanofluids wereinvestigated. Figure 5 shows the results of viscosity ... qCbFigure 6 Thermal conductivity of nanofluids: (a) Variation of thermal conductivity of nanofluids at 25°C with mass fraction of nanoparticles;(b) variation of thermal conductivity with temperature ... Netherlands). A Nexus 470 Fourier transform infrared spectrometer (NICOLET, USA) wasemployed to observe the changes of organic functionalgroups.Preparation of nanofluidsThree types of nanofluids were...
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Báo cáo hóa học:

Báo cáo hóa học: "Investigation of electrical and magnetic properties of ferro-nanofluid on transformers" pptx

Hóa học - Dầu khí

... concentrations of ferro-nanofluidswere applied to the magnetic cores of transformers. Theperformance of transformers with magnetic cores of airFigure 6 The coupling coefficients of transformers ... factor of coils of transformerswith different magnetic cores. Owing to the fact that theincrease of resistance is larger and faster than that of inductance with the presence of Fe3O4nanofluids, ... ferro-nanofluid wasapplied as a liquid magnetic core in a transformer. Theperformance of the transformer with t he ferro-nanofluids was measured, simulated, and compared withthat of a transformer...
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