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数字下变频DDC的matlab原码，采用cordic算法(DDC The DDC matlab source code, you can refer to see)

CSP, Common Spatial Pattern, 共同空间模式方法用于脑电信号EEG的一种较为全面的方法。(Common Spatial Pattern(CSP) method is a way to pre-processing the brain signal (EEG) in order to decrease the influnce of noise signal.)

说明：  修正BBO晶体折射率色散公式中错误的系数 ，完成βBBO晶体Ⅱ类匹配的SPDC（共线情况）并计算相位匹配角。此时的相位匹配角为能 产生纠缠光子对的最小切割角。另附一份参考文献，详细的说明此类实验的步骤与细节。(Correct the wrong coefficient in the refractive index dispersion formula of BBO crystal, complete the type II matching SPDC of BBO crystal and calculate the phase matching angle. The phase matching angle is the minimum cutting angle that can produce entangled photon pairs. In addition, a reference is attached to explain the steps and details of such experiments in detail.)

cepstrum for pitch detection

I created a script that show how to remove repeatable noise with standard pattern in an image.

阵列信号的指向性研究的一个例子，实现这列指向性的一个matlab程序。(The sound field in the wave form, can the system response acoustic waveguide beam forming, it is forming program)

说明：  For load flow analysis of an interconnected power system

SIFT算法的改进加速版本SURF算法，matlab源代码，有测试图片(SIFT algorithm to improve the accelerated version of SURF algorithm, matlab source code, test picture)

《雷达系统设计matlab仿真》书中的 matlab程序代码（7~9章） 【美】Bassem R.Mahafza 著 朱国富等译 电子工业出版社(" Matlab radar simulation system design," the book of matlab code (Chapter 7 ~ 9) London and New York Bassem R. Mahafza with Guofu, M. Electronic Industry Press)

this code describe extract feauter