Han-plain-code-for-all-code-words

DTMF(双音多频)是用两个特定的单音频组合信号来代表数字信号的一种编码技术。两个单音的频率不同，代表的数字或实现的功能也不同。可采用8种频率代表电话机上的16个按键，10个数字键0~9和6个功能键*、#、A、B、C、D。具体的频率组合见参考书。要求： (1) 根据键盘输入的符号，利用MATLAB产生对应的DTMF信号；(2) 分别利用FFT算法和Goertzel算法计算该DTMF信号的频谱并画出频谱图；(3) 根据频谱图确定DTMF信号所代表的符号是否和输入的符号一致。 (DTMF (Dual Tone Multi-Frequency) is a single with two specific combination of audio signals to represent a kind of digital signal coding techniques. Two monosyllabic different frequency, on behalf of the numbers, or the realization of the functions are also different. Eight kinds of frequency of use on behalf of telephone on the 16 keys, 10 numeric keys 0 ~ 9 and 6 function keys*,#, A, B, C, D. The frequency of specific composition of reference books. Requirements: (1) According to the keyboard input of symbols, the use of MATLAB have a corresponding DTMF signal (2), respectively, using FFT algorithm and the Goertzel algorithm DTMF signal spectrum and frequency spectrum draw (3) According to DTMF signal frequency spectrum to determine represented by symbols and input symbols unanimously.)

Some filters such as IIR, FIR...

to linearize the the nonlinear effects of hpa predistortion can be used in ofdm downlink transmission,

matlab S函数学习，举例仿真，可供初学参考着学习。(matlab S function to learn, for example simulation, for beginners reference of learning.)

Three phase curretn loop invereter

一种异结构分数阶混沌系统投影同步的新方法_黄丽莲(A heterologous structural projective synchronization of fractional order chaotic systems new method _ Huang Lilian)

this code generates transient signal

关于地震勘探中资料处理的一些基本编程，这里是关于射线追踪的一个小程序(Some basic programming on seismic exploration data processing, the purpose is to provide a good reference for everyone)

用自适应梯形公式求解常微分方程初值问题的数值解的MATLAB主程序及使用例子。(MATLAB main solving initial value problems of ordinary differential equations using adaptive trapezoidal numerical solutions and the use of examples.)

可在matlab上运行输出的Pt1000铂热敏电阻的分度表，文本格式的。(Can be run in matlab output Pt1000 platinum thermistor sub-degree table, text format.)