单词 | Fourier transform |
例句 | 1. Fontana's treatment relies heavily on the use of Fourier transforms, is very theoretical and mentions few applications. 2. Suppose that an input signal with Fourier transform is applied to a four-terminal network for which the transfer function is. 3. The technique uses Fourier transforms, and reportedly correctly recognises at least 5000 words using 24 various font styles, including cursive ones. 4. Fast Fourier Transform complete code can be used. 5. TI's 2818 Fast Fourier Transform routines. 6. For discrete convolution equation set, generally, people use Fourier transform method to solve. But in some positions, zero frequency will lose. 7. By analysis of general real Fast Fourier Transform(FFT)algorithm, an improved real FFT algorithm is presented based on Graphic Processing Unit(GPU). 8. Compared with traditional inverse Fourier transform method, which used zeros padding method, at the same condition of sampling resolution, the method proposed could decrease the calculation load. 9. This paper presents a Fourier transform pair of a stagger-lag autocorrelation function and its power spectral density (PSD). 10. D FFT ( Fast Fourier Transform ) transform code,() compile and can operate normally. 11. Employing the Fast Fourier Transform Algorithm (FFT) to determine the initial tap coefficients of equalizers is fundamentally different from using the current iteration method. 12. Fourier transform is kind of like taking apart a puzzle, you start with a completed picture and end up with smaller pieces that each make up part of the whole. 13. A large 3-D profilometer which is based on Fourier transform profilometry(FTP)is introduced in this paper. 14. Fourier transform infra red ray spectrum (FT IR), differential scanning calorimeter(DSC) and cross link density were employed in the experiment, and the relation... 15. As well as the frequency spectrum, one can define wave number spectra - Fourier transforms of the space correlations. 16. Extensive facilities for evaluation of catalytic activity include Auger electron spectroscopy and diffuse reflectance and transmission Fourier transform infrared spectroscopy. 17. The results show that we can conveniently control the intensity distribution of the partially coherent flat-topped beam by use of the fractional Fourier transform optical system. 18. An integral expression for the time domain output response of traveling wave (TW) electrooptic phase modulator is derived by using the scalar wave equation and Fourier transform technique. 19. The author has discussed two integral transforms for 2.5-D transient electromagnetic forward modeling, namely, inverse Fourier transform and inverse Laplace transform. 20. When all the sample points are handled after the basic cycle of a time interval finally received and discrete Fourier transform as a result of the introduction of DFT algorithm and the Z-transform. 21. Moire interference spectra were processed by phase unwrapping technique with Fourier transform, so the space phase distribution of Moire deflectograms was extracted. 22. The calculations are based on optical constant data derived from measurements by dispersive Fourier transform spectroscopy. 23. At the second, the program of hardware realization of fractional Fourier transform has been proposed base on the Discrete Algorithm II of fractional Fourier transform. 24. A new algorithm for array synthesis based on inverse Discrete Fourier Transform (IDFT) is proposed in the paper. 25. The measuring accuracy has been improved due to adopting Inverse Fourier Transform based on adding window in frequency domain. 26. This paper describes a new method which uses IDFT (Inverse Discrete Fourier Transform) technique to do time domain near field measurement for antenna. 27. The range and Doppler information are included in the beat frequency of the linear frequency modulated continuous wave radar, and can be obtained by an two-dimensional fast Fourier transform (FFT). 28. The trick is to use what is known as a "fast Fourier transform" to unpick more than 300 separate colours of light in a laser beam, each encoded with its own string of information. 29. The filter is put on the power spectrum before applying the inverse Fourier transform to yield the correlation output. This technique can be used in pattern recognition of grey level input image. 30. Sith give the brief introduction to MOM combined with inverse discrete Fourier transform to analyse transient scattering problems. 31. A point-diffraction interferometry was presented based on Fourier transform instead of the phase-shifting point-diffraction interferometry. 32. Study two of the most important basic operations in digital image processing: 2-D Discrete Fourier Transform and 2-D Discrete Convolution Transform. Map them on RCA. 33. An electric-field cross-correlation Fourier transform spectrometer worked in the region of millimeter waves is described. 34. Fourier Transform cannot offer entire information of signals, namely frequency information presenting to any period of time cannot be confirmed on earth. 35. Objective To identify Paeonia lactiflora Pall. and its confusable varieties by Fourier transform infrared(FTIR) spectroscopy assisted with OMNI sampler. 36. The kinetics of thiol-ene reaction is studied by Fourier Transform Infrared when benzoin dimethyl ether, benzoin ethyl ether, benzoin butyl ether, benzophenone and ITX were used as photosensitizer. 37. After analysing the character of Fourier transform, using 3 level symmetry of Fourier Kernel as a new algorithm for fast Fourier transform was proposed. 38. A blind short-time Fourier transform based approach for symbol timing in OFDM systems is proposed. 39. The reconstructed hologram is obtained by applying inverse Fourier transform to encrypted hologram. 40. With this method, the spectrum leakage can be avoided more effectively than Fast Fourier Transform algorithm and better accuracy can be assured in certain frequency range. 41. The power spectra curve as a function of the mode number of outer or inner profiles are also calculated by the application of fast Fourier transform to the circumferential profile data. 42. The Fourier transform realized by lensless Fourier hologram, and its application to 3-D measurement were studied. The experimental results were presented. 43. The method of impact excitation testing with Fast Fourier Transform (FFT) based on spectrum analyzer to determine the dynamic characteristics of a heald frame is introduced. 44. Combined with stoichiometric method, the diene value in cracking gasoline was determined by Fourier Transform Infrared Spectroscopy at selected wavenumber region. 45. Based on a simplified engine dynamic model, the cylinder pressure torque waveform can be achieved through Discrete Fourier Transform and Inverse Discrete Fourier Transform. 46. The radix-2 decimation-in-time algorithm based on 16-bit fixed-point operation and pipeline architecture are adopted in the core module IFFT(Inverse Fast Fourier Transform). 47. A shift sampling theory established by author (1997a) is a generalization of Fourier transform computation theory. 48. In this paper, three important speech processing techniques of the second class-short-time fourier transform, homomorphic filtering and linear prediction are briefly introduced. 49. By using Fourier transform to demodulate the modulated fringe pattern, two phase maps, which include out -of-plane and in-plane displacements, can be obtained. 50. The fractional Fourier transform of partially coherent flat-topped beams is also studied. 51. Fourier transform infrared spectroscopy (FT-IR) and Differential Scanning Calorimeter (DSC) were used on studying the thermolysis of 4,4'-diaminocarbamate-2,2'-diphenyipropane (DCB). 52. This paper studies the window parameter selection of short-time Fourier transform(STFT) with Gaussian window in detection of linear FM signals. 53. Fast Fourier Transform Algorithm is used to solve the wave equation and numerical calculation is made on the directional force seismic source. Its characteristics are also analysed. 54. In this paper we zoom some regions of FFT spectrum by the Fourier transform, get the precise value of some main frequency, and thus greatly improve the frequency discrimination of FFT spectrum. 55. The single rectangular pulse is a typical signal in Fourier transform, which plays an important role in signal spectrum theory. 56. Before the oxidation treatment, the residues were characterized by gas chromatography mass spectrum(GC-MS) and fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). 57. The Fourier transform power spectrum of input object can be obtained when the input image is placed at the front or back of the hololens. 58. This paper presents computation of the signal's amplitude spectrum and phase spectrum the Fourier transform. 59. A new optical encryption technique based on double random phase computer-generated hologram of asymmetry fractional Fourier transform is presented. 60. The phase composition and the change of crystal lattice parameters were characterized by X-ray diffraction and Fourier transform infrared spectroscopy, respectively. 61. An imaging model of multistatic passive radar is built, then the relationship between target scattering function and the echo signal is proved to hold as a Fourier transform pair. 62. The primary function of the auxiliary signal generator is output sine wave or SWIFT (stored wave form inverse Fourier transform) wave at the scheduled time. 63. The operation for numerical reconstruction of digital lensless Fourier transform holography is experimentally presented. 64. In this thesis, Fourier transform infrared (FTIR) spectroscopy combined with some analytical methods was used to classify and identify Plants of Ericaceae. 65. This paper studies and designs a high performance radix - 4 Fast Fourier Transform ( FFT ) processor. 66. The discharge gap voltage is represented in terms of Fourier transform , the equivalent impedance of DBD discharge gap is available. 67. This procedure realize orthogonal transformation images, including Fourier transform, discrete cosine transform, Walsh transform. 68. Spectral resolution of optical fiber Fourier transform spectrometer depends on maximum optical path difference(OPD). 69. Application of complex conjugate gradient method(CCGM) and fast Fourier transform(FFT) to study multitudinous scattering in near-field optics. 70. From the sampled data of system input and output, the corresponding frequency spectra are obtained using discrete Fourier transform. 71. We have showed that the Radon transform of the cross Wigner distribution function is a separable multiplication of fractional Fourier transform of these functions. 72. However, Digital lensless Fourier transform holography has more outstanding strongpoints and better advantages for shape and deformation measurement of microstructures. 73. Further analysis shows that the quadrature filtering algorithm is a simplified algorithm of Discrete Fourier Transform ( DFT ) . 74. In the current experiment, the team sent their signals down 50km of optical fibre and then implemented what is known as an optical fast Fourier transform to unpick the data streams. 75. The molecular interactions in CC were characterised by dilute solution viscometry, Fourier transform infrared spectroscopy and X-ray diffraction. 76. A digital Fourier transform holographic storage system has been developed for data on photoresist plate. 77. Application DFT Discrete Fourier Transform, right through MATLAB continuous signal spectrum analysis, in order to meet the theoretical analysis and practical needs. 78. The structures and properties of residues after UV photooxidation were investigated by element analysis, equilibrium swelling method and Fourier transform Infrared spectra(FTIR). 79. Influence of Cation Concentration on 7,7,8,8-Tetracyanoquinodimethane in Polyelectrolyte by Using In-situ Microscopic Fourier Transform Infrared Spectroelectrochemistry. 80. Fourier transform image, image enhancement, restoration, coding, analysis, reconstruction and finally the License Plate Recognition. 81. Objective To establish Fourier Transform Infrared Spectroscopy(FTIR) fingerprint of Chinese Herbal Medicine from Lauraceae, Magnoliaceae, Zingiberaceae, Compositae, Umbelliferae. 82. The method consisted in taking the envelope of the inverse Fourier transform of a corrected measured signal. 83. The Fast Fourier Transform (FFT) is one of the most important algorithm of real-time signal processing. It's widely used in EW receivers. 84. The original image was reconstructed exactly through the inverse Fourier transform to the coded image. 85. Based on the Fourier transform analysis of saw tooth signal frequency modulation, the concept of power spectrum spread attenuation factor in the case of barrage jamming is presented. 86. A liquid photoacoustic detector suitable to Fourier transform infrared (FT-IR) spectrometer with a condenser microphone as coupling unit is described in this paper. 87. We got the infrared spectra by The Fourier Transform Infrared (FTIR) spectroscope and measured the thin films' photoconductivity using Coplanar Aluminum Plating Electrode methods. 88. A novel design method for the prototype filters of a Near Perfect Reconstruction(NPR) Discrete Fourier Transform(DFT)modulated filter bank is proposed. 89. A new method that uses the tight support window signal together with the fractional Fourier transform (FRFT) is discussed. 90. This paper proposes a design technique of variable-bandwidth filter (VBF) based on extended Fourier transform (EFT). 91. This article analyse the physics signification of Fourier transform by Hugens principle and Fraunhofer diffraction. 92. Through making the inverse Fourier transform to test light source's interferogram, the authors obtained the spectrum of test source. 93. Because it is too complex to actualize fast fourier transform algorithm with assembly lan- guage in DSP device and the currency of assembly language is too bad, the repeat arithmetic is intro- duced. 94. Secondly, a DSTFT(Discrete Short Time Fourier Transform )-based demodulation method for the 2FSK signal is studied and algorithms for symbol synchronization and symbol decision are analysed. 95. In order to improve the operation tempo of Hilbert transform, this paper recomposed the primary operation method on the basis of FFT (Fast Fourier Transform Algorithm). 96. A new type of holographic sight based on lensless Fourier transform was investigated. 97. This project utilizes Discrete Fourier Transform ( DFT ) to implement the analysis of syntonic wave. In DFT , the use of revised checking table saves interior resource of FPGA. 98. A method for testing meonochromatic focal length of spherical lens using joint Fourier transform spectrum interference technique is given in this paper. 99. Under irradiation, photoreaction occurring between adjacent layers was confirmed by UV Vis and Fourier transform infrared(FTIR) spectra, which covalently attached DNA to DAR in the multilayer. 99. Wish you will love and make progress everyday! 100. Fourier transform infrared spectroscopy (FTIR) was applied to the study of normal and malignant tissues of human myelocytic leukemia (HL-60) xenografted in nude mice. 101. Convolutional differentiator (CD) is obtained by inverse Fourier transform of bandlimited Fourier spectra of partial derivative operator. CD is symmetric or antisymmetric and decays rapidly. 102. Such numerical solution is iterated for all the waves with different frequencies, and all the numerical solutions are transformed into the light fields in the time domain by inverse Fourier transform. 103. With the modification of the reconstruction algorithm, discrete Fourier transform is used to speed up the reconstruction and 3D atomic arrangement is obtained by utilizing the idea of CT. 104. To reconstruct magnetic resonance image with incomplete sampled data is an ill-posed problem to reconstruct the initial signal from the partial data of Fourier transform in nature. 105. After modulation rate estimated roughly using the signal with its delay version production and Newton's iterative method, signals are filtered and separated in the Fractional Fourier Transform domain. 106. The fractional Fourier transform contains the spatial information and the spatial-frequency information simultaneously. The fractional correlation can be used to optical pattern recognition too. 107. Secondly, the eyepiece and the Fourier transform lens are designed to minimize the secondary color by the ways of changing glass. 108. In Linear system, Fourier Transform(FT), Fourier Series(FST), Fourier Z Transform(FZT)and Discrete Fourier Transform(DFT)are used to analyzing and processing signals? 109. Fast Fourier Transform Algorithm is used to solve the wave equation and numerical calculation is made on the directional force seismic source. 110. A number of numerical examples are given and the results are compared with ones obtained from inverse Fourier transform(IDFT). 111. Fourier transform processing darken the overall image, lost some outline information, some but not all indicators meet the requirement, the method could be improved. 112. Taking account of the positioning error, the formulas for determining fraunhofer diffraction, Fourier transform and its physical focal depth region are obtained. 113. Implementing Fourier Transform to solve the acoustic pressure correction equation in the frequency domain can avoid cockamamie retarded time calculation. 114. Infrared spectra of Papaver somniferum L. and Papaver rhoeas are obtained directly, quickly and accurately by Fourier transform infrared spectroscopy (FTIR) with OMNI sampler. 115. A Surface EMG signal identification method based on short time fourier transform is presented in this paper. 116. The nonlinear problem of optical path difference (OPD) of rotating Fourier transform spectrometer universally exists, produced by the rotation of rotating mirror. 117. In the present paper, Fourier transform infrared spectroscopy(FTIR) was used to determine unzymic and zymic Pu'er tea of different grade produced in Simao, Yunan Province. 118. And then analysis of the light intensity is given by using the Fourier transform which is based on the homogeneous coherence function. 119. For synthetic aperture digital lensless Fourier transform hologram, a screen-division reconstruction method is proposed based on theoretical analysis. 120. The Fourier transform characteristics of off-axis hololens was discussed, which was made by using a dot light source and an inclined parallel light. 121. The influence of temperature and moisture on charateristics of pyrolysis gasification semicoke was investigated by Fourier transform infrared spectroscopy (FTIR). 122. The fast Fourier transform (FFT) will bring on higher error under nonsynchronous sampling and truncated non-integral period, thus more accurate interharmonic parameter values cannot be obtained. 123. Substituting the represented points in the proposed random function model and performing the inverse Fourier transform yield the assembles of the stochastic accelerograms. 124. 125. 126. 127. 128. 129. 130. 131. 132. 133. 134. 135. 136. 137. 138. 139. 140. 141. 142. 143. 144. 145. 146. 147. 148. 149. 150. 151. 152. 153. 154. 155. 156. 157. 158. 159. 160. 161. 162. 163. 164. 165. 166. 167. 168. 169. 170. 171. 172. 173. 174. 175. 176. 177. 178. 179. 180. 181. 182. 183. 184. 185. 186. 187. 188. |
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