matlabppt

在信号处理中，信号发射时，信号通过载波，调制，以电磁波的形式发射出来 在接收端，射频信号通过天线接收，超外差式等方式进行处理，变频到中频 然后通过数字技术对中频信号进行处理，此时的中频信号采样率很高，多达几十兆赫 而要解调出来的信号很小，此时就要经过滤波来得到我们需要的信号 如果直接设计滤波器，阶数会非常庞大，软件，硬件设备都承受不了 因此，一般常用的技术是进行下变频处理，其主要技术就是通过抽取滤波进行下变频 常用的滤波器就是CIC抽取, 希望可以帮助一些坛友解决基本的问题。 (In signal processing, signal emission, signal through the carrier, in the form of electromagnetic wave modulation, launched In the receiver, rf signals through the antenna, specialized superheterodyne type means such as processing, the frequency conversion to intermediate frequency Then through digital technology of intermediate frequency signal processing, at this time of intermediate frequency signal sampling rate is very high, as many as several decades MHZ But the signal demodulation out is very small, at this time would be passing filter to get what we need signal If design directly filter, order number be colossal, software, hardware equipment all suffer Therefore, the technology is usually used for down-transducer processing, its main technical is by extracting filtering down-transducer Commonly used filter is CIC extraction, the hope can help some friends solve basic problems of the altar.)

Blood vessel segmentation

说明：  快速谱峭度方法，选择信号峭度最大的频段进行滤波，对滤波好信号进行包络谱分析(Fast spectral kurtosis method, select the frequency band with the maximum signal kurtosis for filtering, and analyze the envelope spectrum of the filtered signal)

hough变换用于直线的检测，适用于计算机视觉的初学者，简单容易理解。。。(hough transform for line detection, computer vision for beginners, easy to understand. . .)

COMPARISON OF MEAN AND MEDIAN FILTER METHOD

法国中央科学研究院和美国RICE大学共同开发了时频分析工具箱（matlab emd） 是一款非常好用的时频分析计算工具，它是分析时变非平稳信号的有力工具，matlab 时频分析工具箱提供了时间域与频率域的联合分布信息，清楚地描述了信号频率随时间变化的关系。 其中主要含有四种函数： 信号产生函数，可以产生不停类型的信号，如Chirp信号，bpsk信号等。 时频分析函数，可以计算线性、Cohen类、仿射类非线性分析值函数，例如短时傅里叶变换（STFT），Gabor变换，谱图，Wigner-Ville（WVD）等。 分析处理函数 图形显示函数，如等高线、三维图等。(Time-frequency analysis toolbox)

matlab智能天线关于波束形成程序的仿真(matlab smart antenna beam-forming process on the simulation of)

介绍了几个认知无线电的宽带频谱检测实现的MATLAB代码，包括能量检测算法、匹配滤波器方法等。(Introduces several MATLAB code based broadband spectrum of cognitive radio technology, including energy detection algorithm, matched filter method, etc.)

使用matlab画圆，对图傅里叶变化，零频移中，反变换实验(test fft and ifft)

Support Vector Machine Implementation in MATLAB