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Description: DFT幻灯片，讲DFT的资料，个人认为不错-DFT slides, stresses DFT information, I believe that good
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Size: 4846592 |
Author: 磊 |
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Description: DFT进行频谱分析时的三种现象
1、混叠：对连续信号采样，要求连续信号是带限的，采样频率要足够高。Fs应满足Nyquist采样定理才不产生混叠。
采样前加低通滤波器防混叠
2、频谱泄漏：DFT对时域信号进行了截断（相当于采样信号乘了一个窗函数），时域的乘积相当于频域卷积，改变了原信号频谱。
改用其他窗函数（非矩形）改善泄漏。
3、栅栏现象：DFT 只给出了频谱在采样点上的取值，采样点间的频谱内容丢失。-DFT spectrum analysis of a three phenomena, aliasing : continuous signal sampling, requiring continuous signal is band-limited, the sampling frequency should be high enough. Fs meet the Nyquist Sampling Theorem would not have aliasing. Sampling former low-pass filter plus anti-aliasing 2, spectrum leakage : DFT right time domain signal a disconnect (equivalent to a sampling signal by a window function). time domain is equivalent to the product of frequency-domain convolution, changes in the spectrum of the original signal. Window functions to switch to other (non-rectangular) to improve leakage. 3, fenced phenomenon : DFT spectrum is given only at the sampling point value, sampling points of the spectrum as lost.
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Size: 148480 |
Author: qinyang |
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Description: 离散余弦变换(DCT for Discrete Cosine Transform)是与傅里叶变换相关的一种变换，它类似于离散傅里叶变换(DFT for Discrete Fourier Transform),但是只使用实数.-discrete cosine transform (DCT for Discrete Cosine Transform ) is associated with the Fourier transform of a transformation, it similar to the discrete Fourier transform (DFT for Discrete Fourier Transfo rm), but only a few use it.
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Size: 301056 |
Author: |
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Description: 这是一个经典的把matlab应用于DFT的例子,适合于初学者-This is a classic application of Matlab put DFT example, suitable for beginners
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Size: 1024 |
Author: |
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Description: 基2FFT,是DFT(离散傅立叶变换)的快速算法-radix 2 FFT, DFT (Discrete Fourier Transform) Fast Algorithm
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Size: 1024 |
Author: Terry |
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Description: 使用MATLAB函数中的FFT命令计算离散时间信号的频谱，以加深对离散信号的DFT的理解及其FFT算法的运用。-using MATLAB function FFT calculation order discrete-time signal spectrum, to increase the discrete signals in the DFT and FFT algorithm understanding of the application.
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Size: 29696 |
Author: tintin |
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Description: dft波束形成程序，空间波束形成，在雷达、声纳行业中有广泛应用-P <0.05 beam forming processes, space beam forming, in radar, sonar sectors which have wider application
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Size: 1024 |
Author: 时节 |
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Description: 构造一组被噪声污染的方波或三角波数据，试选取适当的FIR滤波器结构和参数，分别应用LMS,DFT/LMS和DCT/LMS算法来实现自适应滤波器，对改组数据进行滤波，并分析仿真结果。-Construction Group was one of the Noise Pollution square or triangular wave data, Examination choose appropriate FIR filter structure and parameters, application LMS, DFT/LMS and DCT/LMS algorithm to achieve adaptive filter, the reorganization data filtering, and analysis of simulation results.
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Size: 116736 |
Author: zhangyun |
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Description: ImageTest Visual C下实现图像增强、正交变换（DFT/FFT）、边缘检测-ImageTest under Visual C image enhancement, Orthogonal Transform (DFT/FFT), edge detection
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Size: 215040 |
Author: shanggaofeng |
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Description: 利用经典的Cooley-Tukey基2算法求复序列 的DFT
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Size: 2048 |
Author: 张华 |
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Description: 用途：数字图象处理算法的演示，包括：
• 图象的DFT和逆DFT
• 图象的FFT和逆FFT
• 在图象中加入正弦噪声
• 图象的模板运算实现图象平滑和锐化
• 图象的直方图均衡化
• 图象的对比度拉伸
• 图象的中值滤波
• 图象灰度直方图的显示
• 若干频域滤波器
• 图象的镜像
• 图象的旋转（90度与任意角度）
• 图象的放缩
• 其它小算法
代码设计思想：软件在Windows环境下，利用Visual C++6.0开发，代码利用面向对象的思想，通过若干个类完成：
主要类：
memBitmap类：内存图象类。将图象读入到内存中，对象素的读写在内存中进行，较之通过CDC类来进行，速度有很大提高。同时还对部分JPEG格式图象提供了读支持，可以将图象保存为BMP真彩格式。
Complex类：复数类，完成复数运算。
CBmpDemoView类：视类，完成显示。
CbmpDemoDoc类：文档类，图象数据和对数据的变换、处理都在此类中完成。
Fourior类：完成一维序列的DFT和FFT,FFT只支持为2的整数次幂的情况
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Size: 4011008 |
Author: |
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Description: 包含AM调制，DFT，256FFT，FIR和IIR，另外包含所需的子文件Surport，程序都比较精炼，特别适合DSP初学者上手-AM modulation includes, DFT, 256FFT, FIR and IIR, the other contains a subset of the required documents Surport, procedures are more refined, especially suitable for beginners to use DSP
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Size: 90112 |
Author: cj |
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Description: 主要是对图像实现DFT,DCT变换，利用二维小波分析对图像作二层小波分解，显示条状图，十字图及频谱等-Realize the image is mainly DFT, DCT transform, the use of two-dimensional wavelet analysis of images for the second floor of wavelet decomposition, indicating strip maps, charts and cross spectrum
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Size: 3072 |
Author: 袁辉 |
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Description: 用C编程实现的一些DSP源程序，包括FFT，DFT等。-Programming with C source code of a number of DSP, including FFT, DFT, etc..
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Size: 39936 |
Author: 周成家 |
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Description: 自己写的图象的二维DFT,含有测试代码,并且可以将象素值输出-Write their own two-dimensional image of DFT, containing the test code, and can output pixel value
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Size: 60416 |
Author: 林启荣 |
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Description: DFT数字信号采集滤波器实例演示程序，很实用的一个小程序。-DFT filter digital signal acquisition example demo program, it is a small utility program.
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Size: 6144 |
Author: penghandong |
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Description: 用matlab编写的对水印加入Arnold变换和对图像载体进行DFT变换的水印程序，很有用哦-Used for watermarking matlab prepared to join Arnold transformation and the image carrier to carry out DFT transform watermarking procedure Oh very useful
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Size: 2048 |
Author: 张燕 |
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Description: 数字信号处理实践方法，从一到三囊括了数字信号处理的模数变换、DFT变换、Z变换、滤波器设计等-Digital signal processing practices, from 1-3 to include digital signal processing of analog-to-digital transformation, DFT transform, Z transform, filter design, etc.
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Size: 9216 |
Author: hbeishang |
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Description: 用matlab进行FFT及DFT算法的实现，并测试其运行速度。-Using matlab for FFT and DFT algorithm and test its speed.
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Size: 1024 |
Author: miao |
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Description: 一个基于DFT的水印算法源码；其中有嵌入，提取，测试图片；还有攻击程序，可以用来测试-DFT-based Watermarking Algorithm source including embedding, extraction, testing picture there are attacks on the procedures that can be used to test
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Size: 101376 |
Author: shen xu |
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