QPSK

香农费诺编码的matlab源代码，比较详细，可做参考(Shannon Fenno encoding matlab source code Shannon Fenno encoding matlab source code)

2D flow in channel,poiseuille_channel

耳蜗实质上相当于一个滤波器组，耳蜗的滤波作用是在对数频率尺度上进行的，在1000HZ下，人耳的感知能力与频率成线性关系；而在1000HZ以上，人耳的感知能力与频率不构成线性关系，而更偏向于对数关系，这就使得人耳对低频信号比高频信号更敏感。Mel频率的提出是为了方便人耳对不同频率语音的感知特性的研究。频率与Mel频率的转换公式为(Cochlear substantially equivalent to a filter set, cochlear filter is used on logarithm frequency scale, under the 1000 hz, the perception of the human ear and a linear relationship with frequency In more than 1000 hz, the perception of the human ear does not constitute a linear relationship with frequency, and prefer to logarithmic relationship, which makes the human ear is sensitive to low frequency signal is better than high frequency signal. Mel frequency is put forward in order to facilitate the ear of the study of speech perception characteristics of different frequency. For frequency and Mel frequency conversion formula )

通过调用DSP builder中的设计模块设计的DDS，已经验证通过，可调节频率字来调节输出频率(Through the design module called DSP in the builder DDS, which has been verified by word frequency, can be adjusted to adjust the output frequency)

MATLAB几何变换，可以方便了解到所变换的几种形式(MATLAB geometric transformations, you can easily understand the transformation of several forms)

this code is for speech recognition

说明：  EMD+小波包分解算法matlab实现，能够分解，直接调用就行(Implementation of EMD with MATLAB)

利用蚂蚁算法求解最短路径问题，稍作修改既可以用于移动机器人路径规划当中。(Ants use the shortest path algorithm to solve the problem, with some slight modifications can be used in mobile robot path planning among them.)

交直流调速系统与MATLAB仿真 书籍，PDF格式的，将交直流调速技术和MATLAB仿真技术有机结合在一起，主要内容包括直流调速系统及其仿真、直流调速系统的动态设计及其仿真、直流脉宽调速系统及其仿真、交流调压调速系统和串级调速系统及其仿真、交流异步电动机变频调速系统及其仿真、交流异步电动机矢量控制变频调速系统及其仿真、同步电动机调速系统及其仿真。(AC and DC speed control system with the MATLAB simulation of the book, PDF format, will be AC and DC speed control technology and the organic integration of MATLAB simulation technology together, the main features of DC drive system and its simulation, the dynamics of DC drive system design and simulation DC PWM system and its simulation, AC voltage regulation speed control system and cascade speed regulation system and its simulation, the exchange of asynchronous motor VVVF system and its simulation, the exchange of vector control induction motor variable frequency speed regulation system and its simulation, synchronous motor speed control system and its simulation.)

this file computes the distance between two vectors using the dynamic time wrap technique.