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matlab-11212
matlab code remote sensing
- 2012-04-14 18:41:31下载
- 积分:1
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xihuapu
故障诊断的源码,基于matlab,包括时域频域,细化普,倒频谱等(Zoom Spectrum program)
- 2014-10-28 17:15:36下载
- 积分:1
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Heli_Da_Y
这是关于二自由度直升机模糊控制的simulink仿真模型,很好的参考(This is about two degrees of freedom simulation model simulink fuzzy control helicopter, a good reference)
- 2013-11-28 21:24:03下载
- 积分:1
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timing
sc-fde(单载波频域均衡)系统的定时功能仿真(sc-fde (single carrier frequency domain equalization) system timing functional simulation)
- 2010-08-04 20:53:30下载
- 积分:1
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difference
讲述在designer 6中差分布线的方法(About the difference in the designer 6 in the method of wiring)
- 2010-08-08 15:20:52下载
- 积分:1
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zigzag
zigzag function for matlab
- 2012-05-02 20:51:42下载
- 积分:1
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BLDC_PID0927
基于MATLAB/simulink的永磁无刷直流电机调速系统仿真,已调试完毕,效果还可以。(Based on MATLAB/simulink of permanent magnet brushless DC motor speed control system simulation, debugging has been completed, the effect can be.)
- 2016-04-20 19:19:46下载
- 积分:1
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IsomapR1
Instructions for Isomap code.
- 2007-11-22 09:04:05下载
- 积分:1
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gaussSeidel_3_barras
Power flow usando Gauss-Seidel
- 2013-05-02 04:05:51下载
- 积分:1
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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