step4aa

這是一個類神經網路中倒傳遞類神經網路，應用於圖形識別上，可以把兩個不同分類的點，藉由BP找出他的分割線進行區分(This is a type of neural network back-propagation neural network applied to pattern recognition, it can be classified into two different points, by BP to find his distinction between partition lines)

zcr : ampzcr.m -- short time energy and zero crossing rate program vad.m -- endpoint detection

Low Pass filter Matlab

模拟光在二维介质中传输，用FDTD方法，Matlab程序编写．(in a two-dimensional simulation of optical transmission medium, using the FDTD method, Matlab programming.)

无约束多维极值问题,适合数学计算,优化分析等极值问题的求解(Unconstrained multi-dimensional extremum problem, is suitable for mathematical calculations, the extremum problems of solving optimization analysis, etc )

M=63 J=(M-1)/2 Wp=0.5*pi Ws=0.6*pi Np=100 Ns=100 weightp=1 weights=100 通带和阻带的加权系数 WpN=linspace(0,Wp,Np) WsN=linspace(Ws,pi-0.05,Ns) Wm=[WpN WsN] p=[ones(1,50),ones(1,50)/2] d=[p,zeros(1,Ns)] W=diag([weightp*ones(1,Np),weights*ones(1,Ns)]) C=cos(Wm*[0:J]) Q=diag(cos(Wm*0.5)) g=(W*Q*C)(W*d) g=g h=(g(J:-1:2)+g(J+1:-1:3))/4 h=[g(J+1)/4 h g(1)*0.5+g(2)/4] h=[h fliplr(h)] W=linspace(0,pi-0.1,512) H=freqz(h,1,W) plot(W/pi,20*log10(abs(H))) (filter design)

关于MATALAB的书籍文章很经典值得一看解压后必须使用超星浏览器观看(MATALAB article on classic books worth a visit after decompression must use a browser Chaoxing Views)

对图像进行均衡化的matlab程序,使用的图像是标准的lena 大家可以选择其他图像看效果(A PRAOGRAM TO ACHIEVE A IMAGE JUNHENGHUA)

MSK解调的新方法，除了差分解调，复数滤波器解调，提出了一种基于MSK信号特殊点FFT的实部或虚部比较判决的方法来实现MSK信号的数字解调。(MSK new method of demodulation, in addition to the differential demodulation, complex filter demodulation, this paper proposes a special point FFT based on MSK signal of real or imaginary part of comparative judgment method to realize the MSK signal digital demodulation.)

说明：  本程序用matlab编写，给出了特定参数下，光纤掺杂深度与阈值之间的关系(pumping threshold vs adoping density)