-
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
-
matlab-image-study-(1)
MATLAB图像处理的资料，包括图像倾斜校正，图像腐蚀和膨胀(matlab image erosion and dilation study)
- 2014-09-07 17:11:23下载
- 积分：1
-
horn
field distribution of a horn antenna 2D
- 2011-10-01 17:56:23下载
- 积分：1
-
fit2
数据拟合 (Numerical routine fit)
- 2010-09-27 13:40:36下载
- 积分：1
-
colorcoding
color coding for resistor
- 2009-11-16 10:53:56下载
- 积分：1
-
PSNR
Calculate the PSNR of two images
- 2011-06-27 00:16:08下载
- 积分：1
-
GMM_dynamics_position_orientation
Gribovskaya, E., Khansari Zadeh, S. M. and Billard, A. (2010) Learning Nonlinear Multi-Variate Motion Dynamics for Real-Time Position and Orientation Control of Robotic Manipulators. International Journal of Robotics Research. [Infoscience]
- 2014-02-06 16:49:08下载
- 积分：1
-
programdecomp
this program used in the denoising muticopie transformed images via wavelet
- 2010-07-04 17:13:31下载
- 积分：1
-
motion-blur-Image-Restoration
说明： 用matlab开发的运动模糊复原程序，包括运动参数的估计、维纳滤波器的源代码(Development of the motion blur with matlab recovery procedures, including the motion parameters estimation, Wiener filter source code)
- 2011-03-26 22:07:58下载
- 积分：1
-
BP_net
利用matlab神经网络对齿轮箱进行故障诊断，程序经调试完全好用(Matlab neural network used for fault diagnosis of gear box, easy to use program by the debugging of)
- 2010-05-18 20:21:21下载
- 积分：1
