v3-4-38

实现相控阵雷达天线波束的形成，可以清楚地看到随相位变化的波形能量分布。(To achieve the formation of phased array radar antenna beam, we can clearly see the waveform energy distribution with phase change.)

基于接收信号强度的KNN室内定位算法，还有测试数据。适合初学者参考(KNN indoor positioning algorithm based on the received signal strength, as well as test data. For beginners)

The elegant and special HW for signal processing, GSD part

在一幅图像上画圆，可以输入二值或灰度图像(Drawcircle in an image, you can enter binary or gray image)

说明：  本程序可以实现经典的比例导引弹道的仿真，效果明显(This program can realize the simulation of classical proportional guidance trajectory, and the effect is obvious)

用matlab编写的Delaunay三角化的程序，在points里面修改自己的初始点。(Delaunay triangulation using matlab program to modify the initial point, the points inside.)

dsp最小系统详解，非常丰富，适合新手学习(DSP minimum system detailed solution, very rich, suitable for novice learning)

说明：  求解随机微分方程dx=sinxdt+xdw的数值解(NUMERICAL SOLUTIONS FOR SOLVING STOCHASTIC DIFFERENTIAL EQUATIONS dx=sinxdt+xdw)

实现了基于背景差分法与三帧差法的运动目标检测(A moving object detection method based on background difference and three frame difference method is implemented.)

1）设计Butterworth型音频抗混叠滤波器； 2）参数： 下通带频率300Hz；上通带频率3400Hz； 下阻带频率280Hz；上阻带频率3600Hz； 通带最大衰减0.3dB； 阻带最小衰减40dB； 3）采用一低通滤波器和一高通滤波器级联； 4）分别确定LPF和HPF的性能指标； 5）求出两滤波器的系统函数和频率响应，并画出其幅频特性曲线； 6）求整个滤波器的系统函数和频率响应，并画出其幅频特性曲线。(1) the design of Butterworth-type audio anti-aliasing filter 2) parameters: passband frequency of 300Hz on pass-band frequency 3400Hz under the stop-band frequency of 280Hz on stop-band frequency 3600Hz passband maximum attenuation of 0.3dB minimum stopband attenuation of 40dB 3) the use of a low-pass filter and a high-pass filter cascade 4) separately to determine the performance of LPF and HPF target 5) to derive two-filter system function and frequency response, and draw its increase frequency characteristic curve 6) for the entire filter system function and frequency response, and draw its amplitude-frequency characteristic curve.)