Digitalmodem

四相绝对相移键控的仿真和分析，四个图形合成，有意思(Four-phase phase-shift keying absolute simulation and analysis, four graphics synthesis, interesting)

image sharpening with psnr value

NUMERICAL INTEGRATION: Implementation of the routine of order 8 and applied on the function sin(x), 0<=x<=pi Code is very understodable, and converge very fast.

说明：  自适应网格划分通用程序包，美国伯克利大学开发。(Adaptive Mesh generic package, the United States developed at the University of Berkeley.)

可以产生不同调制方式的信号，包括bpsk,qpsk,fsk,msk,16qam,64qam.可以产生不同的样本。(Can generate a signal of different modulation methods, including bpsk, qpsk, fsk, msk, 16qam, 64qam. Can produce different samples.)

划分树求区间K小数的Pascal源代码, 其建树复杂度为O（nlogn）, 回答询问为O（logn)(A kind of tree to answer the kth smallest number in an interval. )

The attached source code is the implemenation of acoustic echo canceller and noise reduction.

遗传粒子群和混沌粒子群进行FIR滤波器的设计，并进行对比，滤波器可改，可寻到最优解！(Genetic particle swarm and chaotic particle swarm FIR filter design, and contrast, the filter can be changed, the hopes of finding the optimal solution!)

通过边界集中识别图像形状特性，并返回数值(Images by identifying the boundary shape characteristics of centralized and return values)

说明：  BP神经网络实现数据分类，实现语音特征信号的分类(BP network realize voice feature classification )