Description: matlab 数字图像信号的频域分析及仿真
将二维数字图像进行傅立叶频域分析，并且做了图像幅度谱重建和相位谱重建，通过这个例子大家可以明白相位比振幅更重要。-matlab digital image signals in frequency domain analysis and simulation of two-dimensional digital image Fourier frequency domain analysis, and has done a reconstruction of the image amplitude spectrum and phase spectrum reconstruction, by this example we can understand the phase is more important than the amplitude. Platform: |
Size: 791552 |
Author: 自由色彩 |
Hits:
Description: 利用matlab 进行段数傅里叶变换，进行频谱分析，对于从事相关工作的人很有帮助。-The number of segments by using Fourier transform of MATLAB, frequency spectrum analysis, is helpful to be engaged in relevant work. Platform: |
Size: 1024 |
Author:任建文 |
Hits:
Description: 在风基本特性的理论基础上,应用Shinozuka方法对大跨结构的广义脉动风进行了模拟,引入快速傅立叶变换(FFT)技术以提高计算效率,同时给出了Matlab程序框架,并把模拟谱与目标谱进行比较验证,两者吻合较好.-Based on the theory of the basic characteristics of the wind on the application of the generalized method Shinozuka fluctuating wind span structures were simulated, the introduction of the fast Fourier transform (FFT) techniques to improve computational efficiency and given Matlab program framework and the simulated spectrum comparing the target spectrum validated both in good agreement. Platform: |
Size: 1649664 |
Author:李雷 |
Hits:
Description: 频谱分析仪是信号处理研究领域必不可少的工具。现有的基于快速傅利叶变换的频
谱分析仪能对线性的平稳的信号进行有效分析，但难以分析出非线性非平稳信号的瞬时频率
能量变化情况。针对此问题，本文设计了基于希尔伯特黄变换的频谱分析仪，能够对非平稳
信号进行有效分析。所设计系统以DE2-FPGA开发板为硬件平台，结合了NiosII的软核处
理器加以实现，可对采集的外部信号进行希尔伯特黄变换，得到信号的时间-频率-能量三维
谱，并可在VGA上实时显示出来。系统测试结果表明，所设计频谱分析仪对非线性非稳定
信号有很好的效果，与Matlab处理结果保持一致，有效弥补了传统信号分析仪的不足。-Spectrum analyzer is an essential signal processing research tool. Existing analysis can effectively smooth linear signal spectrum analyzer based fast Fourier transform, but it is difficult to analyze the nonlinear and non-stationary signal instantaneous frequency energy changes. To solve this problem, we design a spectrum analyzer based on Hilbert Huang Transform, able to carry out effective analysis of non-stationary signals. The design of the system to DE2-FPGA development board as the hardware platform, combined with the soft-core processor NiosII be achieved, the external signal acquisition can be Hilbert Huang transform, time signal- Frequency- dimensional energy spectrum, and can be displayed in real time on the VGA. System test results show that the design spectrum analyzer nonlinear non-stationary signals have very good results, consistent with the Matlab results, effectively compensate for the shortcomings of traditional signal analyzers. Platform: |
Size: 419840 |
Author:张春竹 |
Hits:
Description: 用解析式定义或矩阵式定义自行编写进行二维DCT和离散沃尔什-哈达玛变换的函数。
在Matlab中对给定图像进行二维离散傅立叶变换，并显示其居中的频谱图，可用Matlab自带函数进行实验。
分别用Matlab自带的dct2()和idct2()对给定图像进行二维DCT变换，并以图像的形式显示其变换系数矩阵。
-And the preparation of two-dimensional DCT is defined analytically discrete Walsh matrix or a self-defined- Hadamard transform function. For a given two-dimensional discrete Fourier transform in Matlab image, and displays its spectrum centered available Matlab function comes experiment. respectively two-dimensional DCT transform for a given image DCT2 comes with Matlab () and idct2 (), and displays an image thereon in the form of matrix transform coefficients. Platform: |
Size: 166912 |
Author:吕文 |
Hits:
Description: 采用MATLAB 2015b综合运用各种函数调用等来实现语音信号时域的短时能量，短时过零以及短时自相关函数分析和频域的傅里叶变换，功率谱估计，短时傅里叶变换，小波分析，语音信号的短时综合，语谱图各种分析，充分了解熟悉语音信号的相关分析方法。(This experiment uses the MATLAB 2015 b, the integrated use of various kinds of function call to realize speech signal in time domain of short-time energy and short-time zero crossing and short-time autocorrelation function analysis and frequency domain Fourier transform, power spectrum estimate, short-time Fourier transform, wavelet analysis, the short synthesis speech signal, the spectra of various analysis, fully understand the familiar voice signal correlation analysis method.) Platform: |
Size: 417792 |
Author:Liu0_
|
Hits:
Description: 对非平稳信号进行分段、截取，将非平稳信号转化为平稳信号，再做短时傅里叶变换，分析其频谱特性，并找到各个时间节点的频率特性，以便分析不同事件段内的声音特征。(The non-stationary signals are segmented and intercepted, and then the short-time Fourier transform is used to analyze their frequency spectrum characteristics, and the frequency characteristics of each time node are found in order to analyze the sound characteristics in different event segments.) Platform: |
Size: 2048 |
Author:帅红
|
Hits:
Description: 对非平稳信号进行分段、截取，再对处理过后的短时信号做短时傅里叶变换，分析其频谱特性，并找到各个时间节点的频率特性，以便分析不同事件段内的声音特征。(The nonstationary signals are segmented, and then the interception, the short-time signal after processing the short-time Fourier transform, the analysis of the spectrum characteristics and frequency characteristics and find the different time node, in order to analyze the acoustic characteristics of different event period.) Platform: |
Size: 7168 |
Author:帅红
|
Hits:
Description: 对非平稳信号进行分段、截取，再对处理过后的短时信号做短时傅里叶变换，分析其频谱特性，并找到各个时间节点的频率特性，以便分析不同事件段内的声音特征，达到区分不同声音的目的。(The nonstationary signals are segmented, and then the interception, the short-time signal after processing the short-time Fourier transform, the analysis of the spectrum characteristics and frequency characteristics and find the different time node, in order to analyze the acoustic characteristics of different event period, to distinguish different sounds to.) Platform: |
Size: 2048 |
Author:帅红
|
Hits:
Description: 对非平稳信号进行分段、截取，再对处理过后的短时信号做短时傅里叶变换，分析其频谱特性，并找到各个时间节点的频率特性，以便分析不同事件段内的声音特征，一图像的形式表达出，最终达到区分不同声音的目的。(The nonstationary signals are segmented, and then the interception, the short-time signal after processing the short-time Fourier transform, the analysis of the spectrum characteristics and frequency characteristics and find the different time node, in order to analyze the acoustic characteristics of different event period, expressed in the form of an image, and ultimately achieve the purpose of distinguishing different voices.) Platform: |
Size: 8192 |
Author:帅红
|
Hits:
Description: 对非平稳信号进行分段、截取，再对处理过后的短时信号做短时傅里叶变换，分析其频谱特性，并找到各个时间节点的频率特性，以便分析不同事件段内的声音特征，以图像的形式表达出，最终达到区分不同声音的目的。(The nonstationary signals are segmented, and then the interception, the short-time signal after processing the short-time Fourier transform, the analysis of the spectrum characteristics and frequency characteristics and find the different time node, in order to analyze the acoustic characteristics of different event period, in the form of images to express, to reach the purpose of distinguishing different voices.) Platform: |
Size: 1024 |
Author:帅红
|
Hits:
Description: 在matlab中，对特定取值范围的傅里叶频谱进行对数变换。(In MATLAB, logarithmic transformation is carried out for Fourier spectrum of a particular value range.) Platform: |
Size: 7168 |
Author:李佳红 |
Hits:
Search - spectrum of fourier in matlab