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Description: DSP编程常用函数 double uniform(double a,double b,long int* seed) double gauss(double mean,double sigma,long int *seed) double exponent(double beta,long int *seed) double laplace(double beta,long int* seed) double rayleigh(double sigma,long int *seed) double weibull(double a,double b,long int*seed) int bn(double p,long int*seed) int bin(int n,double p,long int*seed) int poisson(double lambda,long int *seed) void dft(double x[],double y[],double a[],double b[],int n,int sign) void fft(double x[],double y[],int n,int sign)-DSP programming functions commonly used double uniform (a double, double b, long int* seed) double Gauss (double mean, double sigma, long int* seed) double exponent (double beta, long int* seed) double Laplace (double beta,* long int seed) double Rayleigh (double sigma, long int* seed) double Weibull (a double, double b, long int* seed) int bn (double p, long int* seed) int bin (int n, p double, seed long int*) int poisson (double lambda, long int* seed) void dft index (double x [], double y [], [] a double, double b [], int n, int sign) void fft (double x [], double y [], int n, int sign)
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Size: 2048 |
Author: 山城棒棒儿军 |
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Description: 关于二维小波变换的程序 [精华]
说明：此算法重在概念，速度并不是很快。因为FOR循环的缘故。此程序从循环矩阵的观点出发，把圆周卷积和快速幅里叶变换建立了联系。实现了分解和无失真重构。它只做了一层分解，即将256x256图形分解成为64x64的四个图形，避免了使用WKEEP()的困惑。主要思想为用小波滤波器族构造正交阵W,变换写为B=W*A*W ,反变换为：A=W *A*W,这与所有正交变换无异。W为循环正交矩阵，因此可用FFT实现快速运算，难点就在重构矩阵上。若用矩阵概念明确，一个共扼转置可以搞顶。但FFT的使用必须找到与分解序列的关系。-on Wavelet Transform procedures [best] Note : This algorithm important concept is not speed quickly. Because FOR cycle nowadays. This program cycle from the point of view of Matrix, circular convolution and fast Fourier transform is established links. To achieve the decomposition and reconstruction without distortion. It only had one decomposition, 256x256 graphics will be 64x64 decomposition of the four graphics, avoiding the use of WKEEP () confusion. The main idea of using wavelet filter generator orthogonal array W, write to transform B = W* A* W, anti-Transform : A = W* A* W, which is orthogonal transformation all the same. W cycle orthogonal matrix, can be used to achieve rapid FFT computation, on the difficult reconstruction matrix. If a clear matrix concept, a home to a total o
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Size: 3072 |
Author: 罗松溪 |
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Description: 此为在虚拟仪器中对等间隔的量数据进行滤波a-b-r滤波方法-here for the virtual instruments such as spacing of the data filtering a-b-r filtering method
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Size: 1024 |
Author: GaleWing |
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Description: 这是本人写的用vc6.0调用matlab6.5的一个程序（使用matlab引擎），实现用FFT分析复谐波信号频谱,并调用matlab来显示最终的频谱。希望对各位有点帮助。也欢迎各位提意见。
matlab位于c:\matlab6p5
操作系统是：windows2000
-I write this is the call matlab6.5 vc6.0 with a procedure (using Matla b engine) to achieve using FFT analysis Minute harmonic signal spectrum, and calls to Matlab end of the spectrum shows. You want a bit of help. You are welcome to make suggestions. Matlab is located at c : \ matlab6p5 operating system is : windows2000
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Size: 10240 |
Author: caozhui |
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Description: 信号与系统基础知识包括连续信号与模型、离散信号与模型；常用信号变换包括Z变换、Chirp Z变换、FFT变换、DCT变换和Hilbert变换等；离散系统结构包括IIR、FIR和Lattice结构；IIR滤波器设计包括模拟和数字低通、高通、带通与带阻滤波器设计，以及基于冲激响应不变法和双线性Z变换法的IlR滤波器设计等；FIR滤波器设计包括基于窗函数、频率抽样法和切比雪大逼近法的FIR滤波器设计；平稳信号分析包括经典功率谱估计、基于参数模型的功率谱估计和基于非参数模型的功率谱估计；非平稳信号分析包括STFT变换、Gabor展开、Wigner-Ville分布与Choi-Williams分布；非高斯信号分析包括基于非参数法的双谱估计、基于参数模型的双谱估计，以及双谱估计的应用；信号处理的GUI实现包括滤波器设计与分析的FDATool工具和滤波器设计与信号分析的SPTool工具。-signals and systems based on knowledge, including continuous signal with the model, discrete signal and model; Common signals include transform Z transform, chirp Z-transform, FFT transform. DCT and Hilbert transform; Discrete system architecture including IIR, FIR and Lattice structure; IIR filter design, including analog and digital low-pass, high-pass, band-pass and band stop filter design, Based on the impulse response of the same law and bilinear Z transform the IlR filter design; FIR filter design including on the basis of the window function, frequency sampling and snow all over the big approximation of FIR filter design; stationary signal analysis include classical power spectrum estimation, Based on the model parameters of the power spectrum estimation and non- parametric model b
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Author: james |
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Description: 在stratix里实现快速傅立叶变换的具体源码，以及优化说明-In the Stratix achieve fast Fourier transform of the specific source, as well as the optimization of note
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Size: 35840 |
Author: 韩启祥 |
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Description: 图像分析课程实验报告，delphi实现。
1． 图像显示
能显示图像，显示图像的基本信息，如：直方图、熵。
2． 图像变换
a) 平移
b) 缩放
c) 旋转
d) FFT变换
e) 小波变换
3． 图像增强
a) 直方图增强
b) 小波增强
4． 图像分割
a) 梯度分割
b) Canny算子
5． 图像滤波
a) 低通滤波
b) 中值滤波
c) 高通滤波
d) 带阻滤波
6． 数学形态学
a) 腐蚀
b) 扩张
c) 开运算
d) 闭运算
e) 骨架
7． 模式识别
a) 特征匹配
-Experiment report image analysis program, delphi realize. 1. Image display can show images, display images of the basic information, such as: histograms, entropy. 2. Image Transform a) Translation b) zoom c) rotation d) FFT transform e) Wavelet Transform 3. Image enhancement a) Histogram enhance b) wavelet enhanced 4. Image segmentation a) gradient partition b) Canny operator 5. Image Filtering a) low-pass filter b) median filter c) high-pass filtering d) band-stop filter 6. Mathematical morphology a) corrosion b) expansion c) open computing d) closing operation e) skeleton 7. Pattern Recognition a) Feature Matching
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Size: 285696 |
Author: 齐欢乐 |
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Description: 根据DFT的基二分解方法，可以发现在第L（L表示从左到右的运算级数，L＝1，2，3…M）级中，每个蝶形的两个输入数据相距B=2^(L-1)个点，同一旋转因子对应着间隔为2^L点的2^(M-L)个蝶形。从输入端开始，逐级进行，共进行M级运算。在进行L级运算时，依次求出个2^(L-1)不同的旋转因子，每求出一个旋转因子，就计算完它对应的所有的2^(M-L)个蝶形。因此我们可以用三重循环程序实现FFT变换。同一级中，每个蝶形的两个输入数据只对本蝶形有用，而且每个蝶形的输入、输出数据节点又同在一条水平线上，所以输出数据可以立即存入原输入数据所占用的存储单元。这种方法可称为原址计算，可节省大量的存储单元。附件包含算法流程图和源程序。-err
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Size: 35840 |
Author: 鲍晓 |
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Description: 好用的影像处理系统，可以做fft、dft等高通滤波器。
欢迎大家试用-Useful image processing system, can do fft, dft high pass filter. Welcomed the U.S. trial
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Size: 2262016 |
Author: spencer |
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Description: for(k=j k<128 k=k+2*b) /* for (3) */
{ TR=dataR[k] TI=dataI[k] temp=dataR[k+b]
dataR[k]=dataR[k]+dataR[k+b]*cos_tab[p]+dataI[k+b]*sin_tab[p]
dataI[k]=dataI[k]-dataR[k+b]*sin_tab[p]+dataI[k+b]*cos_tab[p]
dataR[k+b]=TR-dataR[k+b]*cos_tab[p]-dataI[k+b]*sin_tab[p]
dataI[k+b]=TI+temp*sin_tab[p]-dataI[k+b]*cos_tab[p]
} -fft
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Size: 1024 |
Author: wangqikun |
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Description: From given order of rearrangement constructs the permutation matrix P and computes B = P *A*P-From given order of rearrangement constructs the permutation matrix P and computes B = P*A*P
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Size: 2048 |
Author: Sama |
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Description: 印度GURUNANAK ENGINEERING COLLEGE数字信号处理实验室的DSP+c+Matlab联合编程手册-DIGITAL SIGNAL PROCESSING LAB (IV-I SEM)
INDEX
1. Architecture of DSP chips-TMS 320C 6713 DSP Processor
2. Linear convolution
3. Circular convolution
4. FIR Filter (LP/HP) Using Windowing technique
a. Rectangular window
b. Triangular window
c. Kaiser window
5. IIR Filter(LP/HP) on DSP processors
6. N-point FFT algorithm
7. Power Spectral Density of a sinusoidal signals
8. FFT of 1-D signal plot
9. MATLAB program to generate sum of sinusoidal signals
10. MATLAB program to find frequency response of analog
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Size: 1582080 |
Author: wangjin |
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Description: 其中图片说明：
A： 傅里叶变换后频谱图
B：陷波函数作用后的频谱图
C：经逆变换的滤波后图像，效果不是很理想
Ifft2：为验证自己的快速傅里叶变换程序的正确性，用matlab自带逆变换程序将频谱逆变换后图形，与原图相符，说明快速傅里叶变换程序正确。-One Photo caption: A: After the Fourier transform frequency spectrum diagram B: the role of Notch function, the frequency spectrum of post-C: The inverse transform of the filtered images, the effect is not very satisfactory Ifft2: To verify their Fast Fourier Transform program correctness, using matlab inverse transformation process will own the spectrum after the inverse transform graphics, and the Original line, indicating the fast Fourier transform correctly.
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Author: lixiaozhui |
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Description: fft#include <math.h>
#define SWAP(a,b) tempr=(a) (a)=(b) (b)=tempr
//当isign=1时,将输入数据data[1..2*nn]用它的离散Fourier变换系数代替
//当isign=-1时,将输入数据替换为其的离散IFFT系数乘以nn
//data是一个保存nn个复数的数组
//Fourier系数的保存方法为F0的实部和虚部保存在data[1],data[2]
//正的一次谐波系数保存在data[3],data[4]
//负的一次谐波系数保存在data[2*nn-1],data[2*nn]
//最高次谐波系数保存在data[nn+1],data[nn+2]
//nn必须为2的幂-fft
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Author: jakey |
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Description: 二维傅里叶变换,对图像进行二维傅里叶变换处理-Two-Dimensional Fast Fourier Transform
The purpose of this project is to develop a 2-D FFT program "package" that will be used
in several other projects that follow. Your implementation must have the capabilities to:
(a) Multiply the input image by (-1)x+y to center the transform for filtering.
(b) Multiply the resulting (complex) array by a real function (in the sense that the
the real coefficients multiply both the real and imaginary parts of the transforms).
Recall that multiplication of two images is done on pairs of corresponding elements.
(c) Compute the inverse Fourier transform.
(d) Multiply the result by (-1)x+y and take the real part.
(e) Compute the spectrum.
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Size: 1024 |
Author: solo |
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Description: 接口为fft(complex *a, complex *b, int n)。a是输入，b是输出，n为长度-Interface fft (complex* a, complex* b, int n). a is the input, b is the output, n is the length
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Author: reddog |
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Description: FFT的四种算法。
FFT_ABCD.Cpp - 源程序
FFT_ABCD.H - 头文件
FFT0A_T.Cpp - 源程序，检验基-2FFT算法的第1种形式
FFt0B_T.Cpp - 源程序，检验基-2 FFT算法的第2种形式
FFT0C_T.Cpp - 源程序，检验基-2 FFT算法的第3种形式
FFT0D_T.Cpp - 源程序，检验基-2 FFT算法的第4种形式
-four FFT arithmetic
FFT_ABCD.Cpp -source program
FFT_ABCD.H - header file
FFT0A_T.Cpp - test program for A form
FFT0B_T.Cpp - test program for B form
FFT0C_T.Cpp - test program for C form
FFT0D_T.Cpp - test program for D form
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Author: 川少叶 |
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Description: FFT完成了在点阵上的音频显示，有需要的可以下载看看
函数原型：struct compx EE(struct compx b1,struct compx b2) 函数功能：对两个复数进行乘法运算输入参数：两个以联合体定义的复数a,b输出参数：a和b的乘积，以联合体的形式输出*******************************************************************/struct compx EE(struct compx a,struct compx b) {struct compx c c.real=a.real*b.real-a.imag*b.imag c.imag=a.real*b.imag+a.imag*b.real return(c) }-FFT completed a dot on the audio display, there is a need can be downloaded
函数原型：struct compx EE(struct compx b1,struct compx b2) 函数功能：对两个复数进行乘法运算输入参数：两个以联合体定义的复数a,b输出参数：a和b的乘积，以联合体的形式输出*******************************************************************/struct compx EE(struct compx a,struct compx b) {struct compx c c.real=a.real*b.real-a.imag*b.imag c.imag=a.real*b.imag+a.imag*b.real return(c) }
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Author: 陈璐 |
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Description: 基于B超图像，利用傅立叶变换分离低频分量，达到无损测温的目的。-Based on B-picture, the use of low-frequency component of the Fourier transform of the separation to achieve non-destructive temperature measurement purposes.
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Size: 1024 |
Author: liyong |
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Description: 计算线性卷积
b．分别用FFT计算它们的5点、6点、8点和10点圆周卷积。
实验程序
-Computing linear convolution b. FFT were used to calculate their 5:00, 6:00, 8:00 and 10:00 circular convolution. Experimental procedures
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Size: 1024 |
Author: xiyue |
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