Mxulie

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.)

说明：  利用神经网络线性逼近热电偶电压-温度关系，MATLAB源程序。(Using neural networks linear approximation thermocouple voltage- temperature relationship, MATLAB source code.)

说明：  matlab数据和函数的可视化,快速进入matlab神奇殿堂(matlab data and visualization functions, fast access to the magic matlab Hall)

基于无速度传感器的异步电机调速系统，运用电流来合成磁链，控制方法是转子磁链定向。采用电流滞环控制，电网电压380V，转矩最大达30N.m。波形效果不错。(Based on speed sensorless induction motor speed control system, using current flux synthesis method for controlling the rotor flux orientation. Use current hysteresis control, grid voltage 380V, maximum torque of 30N.m. Waveform good results.)

一些我在写毕业论文中用到的关于混沌的相关论文，都是一些有档次的，对我的论文很有帮助(Something I used in writing the thesis on the chaos of the relevant papers, are some upscale, very helpful for my thesis)

追赶法是适用于三对角矩阵的线性方程组求解的方法，并不适用于其他类型矩阵。(Pursuit method for solving tridiagonal matrix of linear equations, does not apply to other types of matrix.)

Simpson二重积分数值算法，注释比较详细(Simpson double integral numerical algorithm, the Notes in more detail)

image processing filters frequency domain code such as high pass and low pass filters

Script for saving a cropped pdf from MATLAB.

speech recognition kallman