11DES_encryption

the code for four bit qpsk with 90 degrees phase shift with constellation and without constellation of noise is given

说明：  fisher分析法，里面有源代码，课件，以及软件，等等……，大家赶快下吧(fisher analysis, which source code, courseware, and software, and so on ... ..., we get under the bar)

用matlab读入wav文件数据的小程序(using Matlab wav file read the small program data)

用matlab程序，以图形的边长和面积之比，实现图片中圆形的检测(detecting circle in a picture)

Kalman scaler Filter

quantization in pam modulation

语音信号分类。 本案例针对四类语音信号，用BP神经网络的方法进行分类。(Speech signal classification. This case for four types of speech signals, using BP neural network method for classification.)

A document for designing power converters by just using simulink

设计一个8阶以内的带通滤波器，通带截止频率fc1=30070HZ，fc2=32170HZ，通带内允许最大衰减0.2dB。设计满足要求的Butterworth滤波器和chebyshev滤波器。以RC运放为基本单元以最易实现的原则完成电路设计及参数选择，并根据设计参数进行幅频特性和相频特性的仿真，给出仿真曲线。分析电路的无源灵敏度。(Design within an 8-order band-pass filter, the passband cutoff frequencies FC1 = 30070HZ, FC2 = 32170HZ allow maximum attenuation 0.2dB within the passband. Designed to meet the requirements of the Butterworth filter and chebyshev filter. RC op amp is the basic unit is the most easy to implement the principle of complete circuit design and parameter selection, and in accordance with the design parameters of the amplitude-frequency characteristics and phase-frequency characteristics of the simulation, simulation curve. Passive sensitivity of the analysis circuit.)

基于电流，转速的双闭环永磁同步电机的矢量控制的仿真模型。。。(Based on current double closed loop speed permanent magnet synchronous motor vector control simulation model)