echo

此代码仿真了一个语音输入输出系统，语音信号经过AD转换后，经过DSSS调制解调后，通过DA转换还原输入的声音，每一步的的波形都可以观测，对实际DSSS系统设计有很大的参考价值(This code simulation of a voice input and output systems, speech signal after AD conversion after DSSS modem through DA conversion to restore the input voice, each step of the waveform can be observed, the actual design of DSSS systems have great reference value)

消除文法的左递归，包括直接左递归和间接左递归(digui)

说明：  画出系统的阶跃响应曲线，计算系统的上升时间，调节时间，超调量，稳态误差。。。(drawing the system s step response and comput its adjusting time \stastical error)

matlab下编写的三步快速搜索法，希望大家有用(Three Step Search Algorithm)

服务桥结构静态参数识别算法Levenberg-Marquardt（L-M方法）matlab源程序(Algorithm for static parameter identification of service bridge structures Levenberg-Marquardt (L-M method) matlab source program)

用matlab实现模拟退火算法,是学习模拟退火算法的有用工具(it is a good programme for annealing simulation)

TopHat algorithm. The algorithm based on gray scale opening.

采用wiener_HOLF方法实现的维纳滤波的过程，对加噪图形采用维纳滤波(wiener_holf method)

说明：  基于MATLAB的人脸检测，对初学者和相关人员有帮助的(MATLAB-based face detection, and associated personnel for beginners help)

描述了一个用matlab描述的卡尔曼滤波实现的例子，可以直接运行观察结果，对kalman滤波的学习有很好的借鉴作用(Describes a Kalman filter is described by matlab examples of implementation can be run directly observe the results of the kalman filter has a good reference for learning)