# Fourier transforms

Xem 1-20 trên 148 kết quả Fourier transforms
• ### FOURIER TRANSFORM – MATERIALS ANALYSIS

This book focuses on the Fourier transform applications in the analysis of some types of materials. The field of Fourier transform has seen explosive growth during the past decades, as phenomenal advances both in research and application have been made. During the preparation of this book, we found that almost all the textbooks on materials analysis have a section devoted to the Fourier transform theory. Most of those describe some formulas and algorithms, but one can easily be lost in seemingly incomprehensible mathematics....

• ### Fast fourier transforms: A tutorial review and a state of the art

The publication of the Cooley-Tukey fast Fourier transform (FFT) algorithm in 1965 has opened a new area in digital signal processing by reducing the order of complexity of some crucial computational tasks like Fourier transform and convultion from N 2 to N log 2 , where N is the problem size. The development of the major algorithms (Cooley-Tukey and split-radix FFT, prime factor algorithm and Winograd fast Fourier transform) is reviewed. Then, an attempt is made to indicate the state of the art on the subject, showin the standing of researh, open problems and implementations....

• ### Sách: FOURIER TRANSFORM – MATERIALS ANALYSIS

This book focuses on the Fourier transform applications in the analysis of some types of materials. The field of Fourier transform has seen explosive growth during the past decades, as phenomenal advances both in research and application have been made. During the preparation of this book, we found that almost all the textbooks on materials analysis have a section devoted to the Fourier transform theory. Most of those describe some formulas and algorithms, but one can easily be lost in seemingly incomprehensible mathematics.

• ### Lecture Signal processing: The discrete fourier transform - Nguyễn Công Phương

Lecture Signal processing: The discrete fourier transform include all of the following content: Computational fourier analysis, the discrete fourier transform, sampling the discrete – time fourier transform, properties of the discrete fourier transform,... and another content.

• ### Bài giảng Xử lý tín hiệu số: Fourier Transform - Ngô Quốc Cường (ĐH Sư phạm Kỹ thuật)

Bài giảng "Xử lý tín hiệu số: Fourier Transform" cung cấp cho người học các kiến thức: Frequency analysis of discrete time signal, properties of Fourier transform, frequency domain characteristics of LTI systems, discrete Fourier Transform, fast Fourier Transform. Mời các bạn cùng tham khảo nội dung chi tiết.

• ### Fourier transforms infrared study on the role of nickel-nanoclusters incorporated in polyaniline films having structure of layer by layer

Fourier transform infrared (FTIR) studies showed the changes in a relative intensity of stretching vibrations of the PANI and PANI-Ni films, in a band of 1480 and 1590 cm-1 , as well as those in a band of 1200 and 1350 cm-1 , and evidenced the conversion of quinoid form of PANI to bipolaron structure, and finally to the more delocalized polaronic sites during protonation. This also shows that nickel-nanoclusters play a role as a source supplying protons to promote the protonation, giving a change in population of quinoid and aromatic forms of PANI, and increasing a number of NH bond.

• ### A Hardware implementation of Winograd Fourier Transform algorithm for Cryptography

This paper presents a hardware implementation of efficient algorithms that uses the mathematical framework. The framework based on the Winograd’s Fourier Transform Algorithm, obtaining a set of formulations that simplify cyclic convolution (CC) computations and CRT.

• ### Complex Functions Examples c-8 Some Classical Transforms

This is the eighth book containing examples from the Theory of Complex Functions. In this volume we show how we can apply the calculations of residues in connection with some classical transforms like the Laplace transform, the Mellin transform, the z-transform and the Fourier transform. I have further supplied with some examples from the Theory of Linear Difference Equations and from the Theory of Distributions, also called generalized functions.

• ### CS 450: Other transform

CS 450: Other transform provides the fourier transform; discrete consine transform (DCT); different transform; hotelling (karhunen - leuve) transform; co-joint repretations; energy compaction.

• ### Lecture Digital image processing: Image transforms - Nguyễn Công Phương

Lecture Digital image processing - Image transforms include all of the following content: Discrete fourier transform (DFT) in 2D, wavelet transform, hough transform.

• ### Real-Time Digital Signal Processing - Chapter 7: Fast Fourier Transform and Its Applications

Frequency analysis of digital signals and systems was discussed in Chapter 4. To perform frequency analysis on a discrete-time signal, we converted the time-domain sequence into the frequency-domain representation using the z-transform, the discrete-time Fourier transform (DTFT), or the discrete Fourier transform (DFT). The widespread application of the DFT to spectral analysis, fast convolution, and data transmission is due to the development of the fast Fourier transform (FFT) algorithm for its computation....

• ### Table of Fourier Transform Pairs

Tài liệu tham khảo về các công thức toán (tài liệu bằng tiếng anh)

• ### Mathematics - Fourier Transforms and Waves

When earth material properties are constant in any of the cartesian variables then it is useful to Fourier transform (FT) that variable. In seismology, the earth does not change with time (the ocean does!) so for the earth, we can generally gain by Fourier transforming the time axis thereby converting time-dependent differential equations (hard) to algebraic equations (easier) in frequency (temporal frequency). In seismology, the earth generally changes rather strongly with depth, so we cannot usefully Fourier transform the depth axis and we are stuck with differential equations in .

• ### FOURIER TRANSFORMS NEW ANALYTICAL APPROACHES AND FTIR STRATEGIES

New analytical strategies and techniques are necessary to meet requirements of modern technologies and new materials. In this sense, this book provides a thorough review of current analytical approaches, industrial practices, and strategies in Fourier transform application.

• ### Fourier Transforms in Radar and Signal Processing_5

Tham khảo tài liệu 'fourier transforms in radar and signal processing_5', công nghệ thông tin, cơ sở dữ liệu phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

• ### Báo cáo toán học: " Discrete Fourier Transform based TOA estimation in UWB systems"

Tuyển tập các báo cáo nghiên cứu khoa học ngành toán học được đăng trên tạp chí toán học quốc tế đề tài: Discrete Fourier Transform based TOA estimation in UWB systems

• ### FOURIER TRANSFORM APPLICATIONS

During the preparation of this book, we found that almost all the textbooks on signal analysis have a section devoted to the Fourier transform theory. The Fourier transform is a mathematical operation with many applications in physics, and engineering that express a mathematical function of time as a function of frequency, known as its frequency spectrum; Fourier's theorem guarantees that this can always be done.

• ### Mathematics of the Discrete Fourier Transform

Tham khảo sách 'mathematics of the discrete fourier transform', khoa học tự nhiên, toán học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

• ### FORMS APPROACH TO SCIENTIFIC FOURIER TRANSFORMS APPROACH TO SCIENTIFIC PRINCIPLESPRINCIPLES

This book aims to provide information about Fourier transform to those needing to use infrared spectroscopy, by explaining the fundamental aspects of the Fourier transform, and techniques for analyzing infrared data obtained for a wide number of materials. It summarizes the theory, instrumentation, methodology, techniques and application of FTIR spectroscopy, and improves the performance and quality of FTIR spectrophotometers.

• ### Fast Fourier Transform part 1

A very large class of important computational problems falls under the general rubric of “Fourier transform methods” or “spectral methods.” For some of these problems, the Fourier transform is simply an efﬁcient computational tool for accomplishing certain common manipulations of data.