Description: 1． 利用自相关函数法和周期图法实现随机信号的功率谱估计。
2． 观察数据长度、自相关序列长度、信噪比、窗函数、平均次数等对谱估计的分辨率、稳定性、主瓣宽度和旁瓣效应的影响。
-1. The use of auto-correlation function method and cycle map Method random signal power spectrum estimation. 2. Observation data length, the length of autocorrelation sequence, the signal to noise ratio, window function, the average frequency of the spectrum estimation resolution, stability, width and the main valve Sidelobe effects. Platform: |
Size: 6144 |
Author:开心 |
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Description: 已知一个序列x(n)=0.5cos(0.55*pi*n)+cos(0.45*pi*n),时域FFT分析其频谱。
（1）使用不同宽度的矩形窗截断该序列为M点，取M分别为：20，40，160,观察不同长度对频谱影响；（2）使用哈明窗和凯泽窗重做；（3）对三种窗的结果进行分析比较；（4）总结窗类型和长度对频谱分析的影响。
-Known a sequence x (n) = 0.5cos (0.55* pi* n)+ Cos (0.45* pi* n), time-domain FFT analysis of its spectrum. (1) use a different width of the rectangular window of the sequence for M cut-off point, take M are as follows: 20,40,160, observing the impact of different lengths of the spectrum (2) the use of Hamming window and the Kaiser window redo (3 ) on the three windows analyzed and compared the results (4) summarize the type and length of window for spectrum analysis. Platform: |
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Author:fg |
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Description: 用matlab编程绘制各种窗函数的形状，窗函数形状的长度为21。
-Matlab programming using a variety of window function mapping the shape, the shape of the length of window function is 21. Platform: |
Size: 1024 |
Author:ladanh |
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Description: 用matlab编程绘制矩形窗函数的幅频特性，窗函数形状的长度为10，20，50，100.-Programming using matlab draw rectangle window function of the amplitude-frequency characteristics, the shape of window function of length of 10,20,50,100. Platform: |
Size: 2048 |
Author:hithit |
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Description: 一个局部直方图均衡化算法，输入为图像和窗口的长宽，并且长宽只能为奇数-A local histogram equalization algorithm, input images and the length and width of the window, and the length and width of only odd-numbered Platform: |
Size: 1024 |
Author:张华君 |
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Description: 基于MVDR算法，计算两个信号的相关性的函数。-This program computes the coherence function between 2 signals
x1 and x2 with the MVDR method.
This algorithm is based on the paper by the same authors:
J. Benesty, J. Chen, and Y. Huang, "A generalized MVDR spectrum,"
IEEE Signal Processing letters, vol. 12, pp. 827-830, Dec. 2005.
x1, first signal vector of length n
x2, second signal vector of length n
L is the length of MVDR filter or window length
K is the resolution (the higher K, the better the resolution) Platform: |
Size: 1024 |
Author:huang |
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Description: 用窗函数法设计一个长度N等于8的线性相位FIR滤波器。其理想的幅频特性为
分别用矩形窗、Hanning窗、Hamming窗、Blackman窗、Kaiser窗(ｂ=8.5)设计该滤波器。
-Window function method used to design a length N equal to 8 the linear phase FIR filter. Its ideal amplitude-frequency characteristics of rectangular windows, respectively, Hanning window, Hamming window, Blackman window, Kaiser window (b = 8.5) the design of the filter. Platform: |
Size: 79872 |
Author:zhangfei |
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Description: 用各种窗函数设计FIR数字滤波器。
分别用矩形窗和Hamming窗设计线性相位FIR低通滤波器。要求通带截止频率，单位脉冲响应h(n)的长度N=21，绘出h(n)及其幅频响应特性曲线。
-Window function with a variety of FIR digital filter design. Were rectangular window and Hamming window design of linear phase FIR low-pass filter. Requirements of passband cutoff frequency, unit impulse response h (n) of length N = 21, draw h (n) and its amplitude-frequency response curve. Platform: |
Size: 3072 |
Author:刘卫菠 |
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Description: 对互谱法被动测距的原理及算法各个环节进行仿真验证：加权最小二乘估计中权系数的选取；相关窗长度的选取；各频段综合方法等等。最后实现了对9000m—15000m距离的测距-Cross-spectral method for passive ranging all aspects of theory and algorithms for simulation: weighted least squares estimation of the right of the selection coefficient related to the length of the selection window an integrated approach to the various bands and so on. Finally realize the right of ranging from 9000m-15000m Platform: |
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Author:田宝晶 |
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Description: Windows in matlab. Blackmanharris, Hamming, Gauss, Kaiser. There is tool for comparing different windows with different parameters. Parameter N set the window length Platform: |
Size: 2048 |
Author:volodia |
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Description: N=15, 。用Hanning窗设计一线性相位带通滤波器，观察它的实际3dB和20dB带宽。N=45，重复这一设计，观察幅频和相位特性的变化，注意长度N变化的影响。-N = 15,. Hanning window design with a linear-phase band-pass filter, observe its actual 3dB and 20dB bandwidth. N = 45, repeat the design, observe the amplitude-frequency and phase characteristics of the change, pay attention to the length of N changes. Platform: |
Size: 20480 |
Author:lm |
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Description: 对录音信号集 中的某一语音，利用BATLAB设计一美尔例谱算法，并实现。
取信号集 中的一个语音信号：“xxxxxx”，将它作为输入的语音信号来为设计一个美尔倒谱算法，在该算法中，主要设计了以下环节：
1.读入一个语音信号；2.对这个信号归一化；3.对归一化的信号进行加窗处理（这里的矩形窗长度必须为257，重帧长64）；4.进行预加重处理，即通过一个高通滤波器： ；5进行512点的FFT；6.分别取模平方得到功率谱；7.在设计的mel滤波器组中，我采用了25个带通滤波器；8.将得到的功率谱信号通过mel滤波器组，得到相应的25个功率值；9.对这些功率值取自然对数；10.对这些值取离散作弦变换；11.将得到的值去掉直流分量，取其它值作为MFCC参数。
-Concentrated on recording a voice signal, using BATLAB designed Mayer cases spectral algorithm, and implementation.
Get a voice signal signal focus: "xxxxxx", will it as input for the design of a voice signal to Mel Cepstrum algorithm in the algorithm, the main design of the following links:
1. Read a speech signal 2. On the signal normalized 3. Of the normalized windowed signal processing (here, rectangular window length must be 257, re-frame size 64) 4. For Pre-emphasis processing through a high-pass filter: 5 for 512 points of FFT 6. modulo square were obtained spectrum 7. in the design of mel filter banks, I use a 25 band-pass filter 8 . will be the power spectrum signal by mel filter bank, corresponding to the 25 power values 9. on the power to take the natural logarithm value 10. to take these values as strings of discrete transform 11. will be of value to out DC component, to take other values as MFCC parameters. Platform: |
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Author:赵欣 |
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Description: 平均周期图法和平滑平均周期图法估计功率谱
从经典功率谱估计周期图法原理入手，从理论上分析了其存在的局限性，借助Welch算法对其进行修正。依靠Matlab强大的数值分析和信号处理能力进行实验!!
用周期图法和welch法分别估计了一下信号的功率谱密度。采样频率200Hz，时间序列长度2048，FFT数据点数2048。其中welch法使用hanning窗，窗口长度600．-Average periodogram and periodogram smoothing method to estimate the average power spectrum from the classical power spectrum estimation periodogram principle starting from the theoretical analysis of the limitations of its existence, with the Welch algorithm, amending them. Rely on the powerful Matlab numerical analysis and signal processing capabilities to experiment!! With periodogram and welch method were estimated signal power spectral density about. Sampling frequency of 200Hz, the time sequence length 2048, FFT data points 2048. Welch method which uses hanning window, the window length of 600. Platform: |
Size: 1024 |
Author:renjie |
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Description: 短时傅里叶变换的matlab仿真程序，不同窗函数、不同窗长下的时频域谱- Matlab simulation program of the Short time Fourier transform, the time and frequency domain spectrum of function of the different windows, different window length Platform: |
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Author:海霞 |
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Description: 1.用四阶 Runge-Kutta 法求数值积分的函数为 RK4
2.此函数的入口参数为：系统维数 dimension,仿真时间 tspan 。
3.tspan 的格式为 [a:h:b] . 其中 a 表示起始时间，h 表示步长，b 表示终止时间。
4.仿真模型的状态方程、输出方程的系数矩阵以及系统初值均存放于文件 input information.txt 中。
5.仿真结果存放于文件 result.txt 中。
6.运行举例：
将 M 文件 RK4.m 和 input information.txt 均存放于 Matlab 的当前工作目录下，然后在 Command Window 中输入以下命令：
dimension=3
tspan=[0:0.01:2]
RK4(dimension,tspan)
回车后，打开 Matlab 的当前工作目录文件夹，找到文件 result.txt ，即可看到仿真结果。-1. Numerical Integration function with fourth-order Runge-Kutta method RK4 2. Inlet parameters of this function: the system dimension dimension, the simulation time tspan. 3.tspan Formats for [a: h: b], wherein A represents a start time, h is the step length, b indicates the termination time. The equation of state of the simulation model, the coefficient matrix of the equation as well as the system initial value of the output is stored in the file input information.txt. The 5. Simulation results are stored in a file result.txt. Running example: the the M file RK4.m and input information.txt of are placed in Matlab current working directory, then enter the following command in the Command Window: dimension = 3 tspan = [0:0.01:2] RK4 (dimension, tspan) Enter, open Matlab' s current working directory folder find the file result.txt, you can see the simulation results. Platform: |
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Author:闫兆敏 |
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Description: matlab标定工具箱，用于图像标定。
设置
1.File-set path-add folder 添加解压缩的工具箱路径
2.Current Directory:设置为要标定图片的文件夹路径
3.command window 键入 calib 调出标定工具箱 开始标定
read images-extract grid corners-calibration （此为内参数）
Comp.Extrinsic 标定外参数
注意事项：
1.wintx winty是定义窗口大小。在鼠标点处为中心的窗口内搜索角点，一般设为默认值，直接回车。
2.在标完第一张图片角点后，Size dX of each square along the X direction ([]=100mm) 是指你实际标定板的方格长度。
3.一般左、右照片张数在20张左右为佳。-matlab calibration toolbox for image calibration. Set 1.File-set path-add folder to add the toolbox path decompress 2.Current Directory: set to the the the calibration picture file folder path 3.command window type read images-extract grid corners Calibration Toolbox begin calibration calib tune out-calibration (This is the parameter) Comp.Extrinsic calibration outside the parameters the Notes: 1.wintx winty is to define the size of the window. Search corner the mouse to point at the center of the window is usually set to the default value, just press Enter. 2 marked the first pictures corner, Size dX of each square along the X direction ([] = 100mm) refers to the length of your actual calibration panel box. 3. General left, the right number of photos in about 20 better. Platform: |
Size: 250880 |
Author:mr.li |
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Description: 利用
MATLAB
实现窗函数法设计
FIR
滤波器，主要是选择合适的窗函
数进行截断运算
-Window function method using MATLAB to design FIR filter, main is to choose the appropriate letter for window blocking operations.First theoretically to approximate the unit impulse response of ideal filter hd [k], to be determined by the passband and stopband attenuation index window function types, determined by transition zone FIR filter order M length (or N), and finally USES MATLAB to calculate the window function value, and hd wN [k] [k] value, so that the design of FIR filter h (k) MATLAB provides the blackman window function is: w = blackman (N) Where N is the length of the window function. Platform: |
Size: 1024 |
Author:zhaoyong |
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Description: 1、验证窗函数 N 变化时，验证其频谱主瓣副瓣比、主瓣宽度的变化。
a)矩形窗函数的 N 变化时，验证其其频谱主瓣副瓣幅度比基本不会发生变化，
而主瓣宽度将会变窄。这说明，当用矩形窗函数设计滤波器时，增大 N 不能使
得阻带衰减减小，但能够减小过渡带。
b)再选取其他的窗如 hamming/hanning 窗，验证当 N 变化时，其频谱主瓣宽
度变化、主瓣副瓣比值变化情况。
2、用窗函数法设计线性相位 FIR 低通，通带截止频率 wp=0.5PI, 阻带截止频率 ws=0.6PI,
阻带衰减不小于 40dB,通带衰减不大于 3dB.
a)选取 Hanning,Hamming 窗查看设计出来的 FIR 的过渡带宽和阻带衰减是否
满足要求，二者有什么不同。
b)使用 hamming 窗，将窗长增大 1 倍，设计 FIR。验证同样的窗函数类型
(hamming)，不同窗长度时，设计出来的 FIR 的过渡带宽和阻带衰减都有什么变
化。
3、不使用 Matlab 系统函数得到上一项指标的低通，并与上一项结果比较。
4 用窗函数法设计线性相位 FIR 高通，通带截止频率 wp=0.8PI, 阻带截止频率
ws=0.7PI, 阻带衰减不小于 30dB,通带衰减不大于 3dB.(An actual filter is implemented using the truncated unit impulse response sequence of the ideal filter.
For the ideal low pass filter, the unit impulse response h, N, D () is intercepted by a length of N, and the length is
The N sequence H (n), when intercepted, guarantees causality and linear phase requirements for the filter.
In order to reduce the Gibbs effect, the H (n) window is added, and the appropriate window function is selected to ensure the stopband attenuation and
Transition zone requirement. Note that the sidelobe of the window function affects the stopband attenuation of the filter, and the main lobe width affects the filter
Transition bandwidth.) Platform: |
Size: 3072 |
Author:花祭嘉音
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Description: 提供采样频率、窗口长度和加载信号。单击信号上的任意点。程序在点的两侧创建一个给定长度的窗口, 并计算并显示 FFT。(Provide the sampling frequency, window length and load the signal. Click on any point on the signal. Program creates a window of given length on either side of the point and calculates and displays FFT.) Platform: |
Size: 8192 |
Author:尼克?特斯拉
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Search - window length matlab