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ImprovementJPEGCompression
An Improvement to JPEG Compression
- 2011-01-08 01:52:36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
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FilterCfg
filterElement extends StringValue Source Code for Andriod.
- 2013-12-06 11:59:25下载
- 积分：1
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data-mining
数据挖掘 《机器学习与数据挖掘：方法与应用》，朱明等译，电子工业出版社(data mining conclude Classification,Estimation,Prediction,Affinity grouping or association rules,Clustering,Description and Visualization,Text, Web ,et al)
- 2011-05-02 18:42:05下载
- 积分：1
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MATLAB-ABC
人工蜂群算法 matlab 实现，人工蜂群算法源代码(Artificial bee colony algorithm matlab implementation)
- 2021-02-28 14:09:35下载
- 积分：1
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impulsive_noise
The function impulsive_noise generates non-gaussian noise with inputs of beta, gamma,and the power of noise is 1 in W or 0 in dB. The noise can be defined either real or complex. The other functions generate QAM symbol and insert a vector to another vetor with specific locations
- 2014-01-06 17:07:01下载
- 积分：1
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Unsupervised-optimal-FCM
Fuzz c-mean Clusterin technique
- 2012-02-10 15:14:11下载
- 积分：1
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Riemann-solver
2D Advection Equation Riemann solver
- 2013-03-12 15:07:54下载
- 积分：1
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dplqifu
雷达中频回波仿真，对固定载频和线性调频脉冲回波的多普勒起伏模型进行仿真(IF radar echo simulation for fixed carrier frequency and chirp echo Doppler fluctuation model simulation)
- 2013-09-29 08:12:51下载
- 积分：1
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PID
详细描述了pid各项参数的调试过程，主要是用于电机控制中。(A detailed description of the commissioning process pid parameters, mainly for motor control.)
- 2015-01-11 14:02:56下载
- 积分：1
