sound_recognition_system

说明：  用Matlab实现阴历和阳历相互转换，里面有注释可供参考(Using Matlab to achieve conversion between the lunar and solar calendar, which has notes for reference)

This is related to kinematics for differential drive motors....

双音多频，由高频群和低频群组成，高低频群各包含4个频率。一个高频信号和一个低频信号叠加组成一个组合信号，代表一个数字。DTMF信号有16个编码。利用DTMF信令可选择呼叫相应的对讲机。(Dual tone multi-frequency, high-frequency and low-frequency group composed of groups, high-frequency group contains four frequencies each. A high-frequency signal and a low frequency signal is superimposed to form a combined signal representative of a number. DTMF signal has a 16 code. DTMF signaling to the appropriate use of the intercom call.)

用matlab实现的主元分析算法，很实用的程序，经调试通过(Matlab principal component analysis algorithm, very practical program, the debugging through)

从MatlabSimulink模型到代码实现(阿斯利康；jdjgaslkg)

OFDM信号及其频谱的matlab仿真源代码，输入信号为随机产生的二进制序列并插入了保护间隔(OFDM signal and its spectrum simulation matlab source code, the input signal for randomly generated binary sequence and insert a guard interval)

高等光学仿真原程序，里面有光纤波导激光原理等(Advanced optics simulation of the original program, which has fiber waveguide laser principle, etc.)

说明：  rs码基于matlab编码，c语言译码，已验证，为正确代码(rs encoding with matlab,and decoding with c)

对三维shepp-logan数据做三维扇形投影，并根据投影数据重建出shepp-logan图像。(Three-dimensional shepp-logan data do three-dimensional projection fan and shepp-logan reconstructed image from the projection data.)

First use EEMD to decompose the original singal to get IMFS,then use FFT to analyse the each IMF,combine EEMD with FFT to get clearer analytic results.