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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
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Matlabuseofcolour
Matlab 颜色的使用 colorbar colormap(Matlab use of colour)
- 2011-12-27 21:59:12下载
- 积分：1
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Difds3
用LAPLACE方法求解多维沃尔泰拉方程，此处为一个变元的方程，由于该方程同时含有微分和积分，一般求解有一定的困难。此处为MATLAB程序，注意不同的边界条件(used method for multiple preoperational Ertaila equation here as a variable element of the equation, As the same time contain differential equations and integral, the general solution is definitely difficult. MATLAB here for the procedures, attention to the different boundary conditions)
- 2007-06-30 13:55:36下载
- 积分：1
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Matlab_ljb
关于 MATLAB 图像加密的讲解 和 图像处理 的内容
很详细(On the MATLAB image encryption and image processing to explain in great detail the contents of the)
- 2010-03-08 14:19:29下载
- 积分：1
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FDTDforSARY
A SIMPLE BUT USFUL 2D FDTD MATLAB CODE(USFUL 2D FDTD MATLAB CODE)
- 2007-04-24 23:15:45下载
- 积分：1
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pdfParseDemo
matlab code for ocr recognition
- 2015-02-12 16:17:25下载
- 积分：1
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MATLAB-VS-VCPP
这是一个人关于，MATLAB转化为VC++能使用的，.dll文件的方法，很实用(This is a man on, MATLAB into VC++ can use,. Dll file method, it is practical)
- 2013-09-14 17:01:21下载
- 积分：1
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wedgelet
matlab小波分析中脊波变换的源码，关于图象去躁，重构等等的。里面还有一篇论文大家可以参考参考！(matlab wavelet analysis ridgelet transform the source, on the image to impatient and remodeling and so on. There is also a paper everyone can refer to reference!)
- 2007-09-05 14:03:15下载
- 积分：1
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legendre-and-lmz
函数逼近中两个重要的方面，勒让德逼近和列梅兹算法(two important aspects in function approximation, Legendre approximation and Remez algorithm
)
- 2014-09-27 12:58:10下载
- 积分：1
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taylor_n
源代码为matlab函数，功能是根据副瓣抑制要求产生taylor权系数(failed to translate)
- 2013-05-05 21:52:32下载
- 积分：1
