Circle_Spectrum

当信噪比低，小信号输入时噪音严重，在整个音域的声音明显变得浑浊不清，不知发的是什么音，严重影响音质。信噪比的大小是用有用信号功率（或电压）和噪声功率（或电压）比值的对数来表示的。(When the signal to noise ratio is low, serious small signal input noise, the sound of the entire range becomes significantly turbid, I do not know what made the sound, seriously affecting the sound quality. Size is the number of the signal to noise ratio by the ratio of desired signal power (or voltage) and the noise power (or voltage) represented.)

MATLAB模型，双馈风电机组基于最大功率跟踪，低风速超速控制，中风速高风速变桨距控制(DFIG MATLABThe wind turbine and the doubly-fed induction generator (WTDFIG) are shown in the figure called The Wind Turbine and the Doubly-Fed Induction Generator System. The AC/DC/AC converter is divided into two components: the rotor-side converter (Crotor) and the grid-side converter (Cgrid). Crotor and Cgrid are Voltage-Sourced Converters that use forced-commutated power electronic devices (IGBTs) to synthesize an AC voltage from a DC voltage source. A capacitor connected on the DC side acts as the DC voltage source. A coupling inductor L is used to connect Cgrid to the grid. The three-phase rotor winding is connected to Crotor by slip rings and brushes and the three-phase stator winding is directly connected to the grid. The power captured by the wind turbine is converted into electrical power by the induction generator and it is transmitted to the grid by the stator and the rotor windings.)

各种蚁群算法详细介绍，详细的例程和讲解。(Details of the various ant algorithms, routines and explain in detail.)

this is basic matlab explanation. i will upload 5documents.

ARCOBJECT 控件编程 对初学者很有帮助(Control programming)

地震波有限差分matlab模拟程序，输出可以为SGY格式，模拟地震波在地下介质中的传播(Seismic wave finite difference simulation program matlab, the output can be SGY format, simulate the propagation of seismic wave in underground medium )

本程序是关于卫星上下变频的简单的实现算法，首先产生双边带调制信号，与收本振混频后，通过低通滤波器完成下变频。再与发本振混频，通过高通滤波器后完成上变频(This program is a simple algorithm on the satellite and down-conversion, the first double-sideband modulation signal generated, after the close of the oscillator mixer, low-pass filter complete the conversion. Again and send the local oscillator mixer, followed by the completion of the high-pass filter frequency)

matlab中绘图的一些精彩例子介绍及相关的代码参考。(Some wonderful example introduces the drawing and the related code in matlab.)

计算以为曲线序列的分数维，可以用于提取分形特征(Calculated that the fractal dimension of the curve sequence can be used to extract fractal characteristics)

这里用的是正交多项式变换法 实现两幅多聚焦图像的融合(Used here orthogonal polynomial transformation method is to achieve more than two-focus image fusion)