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DFT进行频谱分析时的三种现象
- 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
11
- 利用离散傅立叶变换转置因子的性质进行各种变换,将长序列分解成几个较短的序列,从而实现时间抽取和频率抽取两种方法的基-2快速傅立叶变换,并且能够进行两个序列的线性卷积运算和频谱分析。
FIR_pinlv[1]
- FIR滤波器, 设计一个线性相位有限冲激响应低通滤波器,使其满足如下指标:通带边界为2kHz,阻带边界为2.5kHz,通带波纹 =0.005,阻带波纹 =0.005,抽样率为10kHz。采用多尔夫-切比雪夫窗进行设计,进行频谱分析。-FIR filter, design a linear phase FIR low-pass filter to meet the following indicators: passband border to 2kHz, stopband border to 2
CWsinal
- matlab绘制CW信号的时域波形,同时对信号进行频谱分析,并考察采样频率以及信噪比对频谱分析的影响。-matlab draw CW signal time-domain waveform, and spectral analysis of signals and the sampling frequency and signal to noise ratio study of the impact of spectrum analysis.
LPM
- 用matlab绘制线性调频信号的时域波形,同时对信号进行频谱分析,并考察采样频率以及信噪比对频谱分析的影响。-Matlab drawing with linear frequency modulation signal time-domain waveform, and spectral analysis of signals and the sampling frequency and signal to noise ratio study of the impact of spectrum
sin_noise
- 用C++实现图像处理去噪,去除正弦噪点,并进行频谱分析-Using C++ to achieve denoising image processing to remove the sinusoidal noise, and spectral analysis
dsp
- 在数字信号处理中,滤波占有极其重要的地位。数字滤波是语音处理、图像处理、模式识别、频谱分析等应用中的基本处理算法。用DSP芯片实现数字滤波除了具有稳定性好、精确度高、不受环境影响等优点外,还具有灵活性好等特点。-In digital signal processing, filtering an extremely important position. Digital filter is the voice processing, image processing, pattern recog
pinpufenxi
- 在matlab下实现信号频谱分析:利用快速付里叶变换FFT得到下列信号的频谱,并绘制信号及频图形:1.长2s的方波信号,频率f=10Hz -In matlab signal spectrum analysis: the fast in leaf transform FFT get pay of spectrum, the signal and drew the signal and frequency graphics: 1. The long 2s, frequency f = squar
Basic_Image_Process
- 基本的图像处理程序:统计直方图,阈值分割,图形加减,傅里叶频谱分析,频域理想高通、低通滤波,高斯型滤波器,伪彩色编码,可以保存处理以后的图像-Basic image processing: histogram, threshold segmentation, graphics, addition and subtraction, Fourier spectral analysis, frequency domain the ideal high-pass, low pass filter, Ga
fft
- 使用MATLAB对特定信号进行频谱分析,画出幅度和相位谱的图像,并包含卷积运算和验证程序-Using MATLAB on a specific signal spectrum analysis, to draw the image amplitude and phase spectrum, and includes convolution and verification procedures
peakfinding
- 计算图像最大值,具有较好的抗噪效果,对于图像分析尤其是频谱分析有用。-Calculate the maximum image, has good anti-noise effect, image analysis, especially for spectral analysis useful.
HOSA-Toolbox
- 高阶频谱分析工具箱,老外写的代码,可以用来做实验-High-order spectral analysis toolbox, a foreigner writing code that can be used to experiment
Epilepsy-EEG-report---
- 在学习了数字信号处理、信号与系统、建模与仿真及其医学应用等课程的基础上, 学习一类典型的生物医学信号--脑电的测取、FFT 频谱分析、以及应用数字滤波方法提 取脑电的频带(8-13Hz)信号及其特性分析。-Epilepsy section of the brain wave extraction and analysis of characteristics of the course design report
A-Complex-Image-Algorithm-
- 动态场实时检测图像重建算法设计,提出了一种实时测量图像重建的新算法,它以固定近似阶数的频谱分析重建算法(FSART)为初级算法,以改进的联合代数重建法(MSART)为二级算法,能够实现复杂流场的快速、精确测量。-Dynamic real-time detection field image reconstruction algorithm design, we propose a new real-time measurement of image reconstruction algorith
fourier
- 傅里叶变换的基本概念介绍和应用,做计算和频谱分析时蛮有用的。-fourier transform
UltroSound-RF-signal-processing
- 使用matlab工具对RF信号进行处理.频谱分析以及图像重建.-RF signal processing using matlab tools. Spectrum analysis and image reconstruction.
Fourier
- 实现一维离散信号的傅里叶频谱分析,并进行结果显示-One-dimensional discrete signal Fourier spectrum analysis, and the results show that
gaborfilterInMatlab
- gabor 源代码 可以用来纹理提取,以及频谱分析-the gabor source code can be used for texture extraction, and spectrum analysis
imagefuyuan
- 数字图像处理课程上老师授课的实例程序,图像复原部分主要针对图像去噪,以及图像灰度频谱分析,适合初学者,每个程序均能运行,内附测试图片-Digital image processing course instructor instances of the program, the image restoration parts mainly for image denoising, and image gray spectrum analysis, suitable for beginners,
图像频谱分析和滤波
- 对含有噪声的图像进行频谱分析,通过滤波去除随机噪声,通过中值滤波去除椒盐噪声(Spectral analysis of the noisy images removes random noise by filtering and removes salt and pepper noise through median filtering)