-
03607_28
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.)
- 2007-05-08 16:22:17下载
- 积分：1
-
mp030211
关于信号和图像处理的稀疏分解的源程序，里面有详细的内容介绍，在WORD文档里面(Signal and image processing on the sparse decomposition of the source, which has detailed description, which in the WORD document)
- 2010-08-19 09:48:36下载
- 积分：1
-
histogram_balltracker
A new concept of tracking ball has been applied of detecting the ball in one frame by finding centroid ball ,finding histogram of the ball region and correlating it with candidate s histogram (by scanning the complete image) in subsequent frames. Matching of histogram indicates presence of ball ,hence tracks it.
- 2009-12-11 01:39:15下载
- 积分：1
-
OFDM_Transmitter
OFDM transmitter for DVB-T. Credit to Guillermo Acosta.
- 2009-06-09 15:11:00下载
- 积分：1
-
p0802
说明： \matlab编写的车牌定位的程序,两个.m文件(\ Matlab written procedures for license plate location, 2. M file)
- 2010-04-29 22:21:37下载
- 积分：1
-
Matlab
这是MATLAB课件，有很多matlab常用的命令及使用方法，适合想学matlab的人(This is the MATLAB software, there are a lot of matlab commonly used commands and how to use, suitable for people who want to learn matlab)
- 2013-09-20 18:54:24下载
- 积分：1
-
NLMF2Dtree
nonlocal mean for 2-D 3-D IMAGE PROCESSING
- 2013-04-05 21:15:28下载
- 积分：1
-
clean
用clean方法进行现代谱分析实验，经过运行程序，结果有效，算法简单。(Methods with clean modern spectral analysis of experiments, after running the program, the results are valid, the algorithm simple.)
- 2011-11-30 10:08:37下载
- 积分：1
-
diyizhang
matlab课件很有用的,对matlab学习很有帮助(it s very useful)
- 2014-01-24 10:55:17下载
- 积分：1
-
CTBXZ
动态电力系统次同步谐振.次同步谐振一是交流输电系统中由串联电容补偿引起的次同步谐振问题，二是由一些电气装置引起的次同步振荡问题。次同步振荡会使轴系产生很大的扭矩，严重情况下可能导致大轴出现裂纹甚至断裂， 或因反复承受较大转矩造成疲劳积累， 使轴系寿命降低。因此，对次同步振荡进行准确的分析和计算， 采取有效的监视、防止和保护措施是非常重要的。程序是对交流线路串补偿电容引起的次同步振荡抑制的编程。(dynamic power system subsynchronous resonance.)
- 2016-01-21 21:06:27下载
- 积分：1
