testfunctionscodess

用双线性变换法设计IIR数字滤波器 滤波就是将外界干扰的不需要的频率滤除掉，一面影响要测试数据的结果。比如如果是心电波的话，如果这是外界有很大的噪声干扰，滤波就是把不必要的信号给抑制掉，以便对心跳的正常测试。通过图比较，滤波后的明显比之前的要平滑，就是滤去干扰噪声的结果。采样间隔对实验有影响，取的过大会导致频率混叠。(Bilinear transformation method using digital filter IIR filter design is to outside interference filter out unwanted frequencies, while the impact to test data results. For example, if it is so heart waves, if this is a great noise outside interference, filtering is unnecessary signal out to the curb in order to test the normal heartbeat. Through chart comparison, after filtering than before to smooth the noise interference is the result of least squares. Sampling interval of the experiment affect take-off frequency of the General Assembly leading to aliasing.)

生成PN序列（伪随机噪声序列），阶数包括2阶，3阶，4阶，5阶，6阶，7阶，8阶。并在前面补0后形成相应的2的幂次长的序列。(Generated PN sequences (pseudo-random noise sequence), including the orders of 2 order, 3 order, 4 order, 5 order, 6 order, 7 order, 8 order. And fill in front of 0 after the formation of the corresponding power of 2-long sequence.)

光学字符识别，是matlab代码，简单易懂，有详细的注释(Optical character recognition, it is easy to understand and matlab code with detailed notes)

说明：  将输入A律PCM编码器的正弦信号采样,进行PCM编码，求出编码器的输出码组序列。(legal importation A PCM encoder sinusoidal signal sampling, PCM coding, coding obtained the output code sequence.)

对齿轮箱故障进行提升小波去噪分解重构，准确判断初故障类型(Gearbox fault on lifting wavelet de-noising decomposition and reconstruction and accurately determine the beginning of the fault type)

this is the program for Digital modulation

ball & beam lead PD matlab m-file

LMS identification volterra order 4,degree 4

基于全局图像信息的图像分割代码。matlab(image segmentation matlab code based on image globle information)

用matlab求响应曲线包络线的程序，是用来绘制lamb波在复合材料板中的传播响应曲线的。(Use matlab for response curve of envelope，Is used to draw the lamb wave propagation in composite material plate response curve。)