mincircle

说明：  通过一个循环方阵A来构造准循环LDPC码的校验矩阵H(make H in QC-ldpc)

录制自己的一段语音，时间控制在15秒到30秒左右；利用wavread函数对自己的语音进行采样，记住采样频率。 （1）画出原始语音信号的时域波形，而后以1秒为间隔，求出每秒数据的功率谱。 （2）根据语音信号特点，分别设计FIR及IIR滤波器，分别画出滤波器幅频和相频特性曲线。用设计的滤波器对信号滤波，画出滤波后时域波形。用sound函数回放语音信号。 （3）求出特征频段语音信号随时间变化的曲线（每间隔0.05秒求一次功率谱）。 (Record your own voice for some time (15 seconds to 30 seconds) use wavread function of the voice samples, remember the sampling frequency. (1) Draw the original speech signal in time domain waveform, and then to 1 second intervals, the data obtained power spectrum per second. (2) According to the voice signal characteristics, FIR and IIR filters were designed, namely to draw the amplitude and phase frequency characteristic curve. With the design of the filters on the signal filtering, to draw the filtered time-domain waveform. Playback with sound function of the speech signal. (3) Find the characteristic band speech signal curve over time (0.05 seconds intervals seeking a power spectrum.))

说明：  在matlab2019B中，已经将princomp函数改为了pca函数，功能相同，函数名改变，所以如果要使用，记得将老版本的代码中的princomp改为pca。(In MATLAB 2019b, the principal function has been changed to PCA function. The functions are the same, and the function name changes. So if you want to use it, remember to change the principal function in the old version of the code to PCA.)

说明：  在MATLAB上所使用的PCA程序，主要應用於過濾相對較不重要的特徵值(dimension)，例如在三度空間的某些點具有(x,y,z)值，因為這些點有共同的一個持徵，就是z值相對於x,y值來得小很多(不明顯)，所以就以X,Y軸來表示這些點。此時就達成去除掉z的特徵值(dimension)。 (MATLAB used in the PCA procedure, mainly used in filtering relatively unimportant eigenvalue (dimension), for example, in some points with three-dimensional (x, y, z) values, because these points have a common one sign holders, that is, z values compared with the x, y values much smaller than (not obvious), so on to X, Y axis to express these points. Reached at this time to get rid of z eigenvalues (dimension).)

这个是最小二乘算法的一个重要用途，在实际操作中有广泛的应用，可以处理很多问题！(This is an important use of least squares algorithm, in practice a wide range of applications, can handle a lot of problems!)

matlab FIR 低通，高通和带通滤波器的完整程序,本人花了好多时间自己写的,有滤波前后图形对比(matlab FIR low-pass，high-pass and band-pass IIR filters full process, I spent a lot of time to write your own, there is before and after the graphic correlation filter!)

雷达长时间积累检测TBD源代码,采用粒子滤波方法，仅供参考。(A matlab resource for radar long term integral with TBD)

Least Mean Square ALgorithm

02 MATLAB 7.0实用宝典：MATLAB 7.0实用宝典(02 MATLAB 7.0 Practical Collection: MATLAB 7.0 Practical Collection)

说明：  艾伦方差可以用来分析陀螺的各项性能指标，本matlab程序运行效果为对勾形的双对数曲线图(Allen variance can be used to analyze various performance indexes of gyroscope. The matlab program is double logarithm curve of checkmark)