ch3_matlab_ex

To investigate the effects of the discrete Fourier transform parameters on the frequency spectra of discrete-time signals. (Display x(n) on the screen with the plot command in Matlab)

说明：  灰色预测方法的特点表现在：首先是它把离散数据视为连续变量在其变化过程中所取的离散值，从而可利用微分方程式处理数据；而不直接使用原始数据而是由它产生累加生成数，对生成数列使用微分方程模型。这样，可以抵消大部分随机误差，显示出规律性。(The characteristics of the grey prediction method are as follows: First, it regards the discrete data as the discrete value of the continuous variable in its change process, so that the differential equation can be used to process the data; instead of using the original data directly, it generates the cumulative generation. Number, using a differential equation model for generating a series. In this way, most of the random errors can be offset, showing regularity.)

想保留的成分为cos(2*π*n/3) 带通滤波器，滤除1+cos(2*π*n/3) 的成分，即想保留的成分为cos(π*n/4) 带阻滤波器，滤除cos(π*n/4) 的成分，(Want to keep the ingredients for the cos (2* π* n/3) band-pass filter, filter 1+ Cos (2* π* n/3) of the composition, that is, want to keep the ingredients of cos (π* n/4 ) band-stop filter, filter cos (π* n/4) of the composition,)

When you use the Microsoft Automation functions VariantTimeToSystemTime to convert variant time to system time and the SystemTimeToVariantTime to convert system time to variant time, the milliseconds value appears as zero or is ignored

是“MATLAB混合编程与工程应用”一书的源码，该书高洁和孙新德编著 清华大学出版社出版 2008年5月 本书以MATLAB最新版本R2006a为蓝本，系统介绍了MATLAB混合编程的最新技术。全书共分11章，第1和第2章概述了 MATLAB混合编程的发展状况及基本方法，第3至10章分别介绍了几种典型的混合编程方法，包括使用MEX、MATLAB Engine、MATLAB ACTIVEX、Mideva、MATLAB Builder for .NET、MATLAB Web Server进行混合编程，以及MATLAB和Visual Basic、Excel等混合编程。第11章以数字水印技术为例介绍了MATLAB混合编程在工程中的典型应用。 本书按照混合编程常用方法进行编写，第3至10章的每章都为一个独立单元，读者可以任选其中一章或几章进行学习，每章重点阐述一种混合编程方法的实质和要点，实例描述贯穿始终。 本书不仅具有理论深度与广度，而且注重实用，实例丰富，特别是通过作者在数字水印方面的研究成果，提供了理论分析与应用案例。 本书可以作为高等院校计算机及信息相关专业的教材或参考书，也可供广大科技工作者参考。(err)

PID控制系统 对于系统的非线性 超调量 震荡等不稳定因素有很好的控制(PID control system for the nonlinear overshoot shocks and other uncertainties have very good control)

segmenting image whith matlab

在AWGN信道模型下，对比ACO-OFDM和其他调制方式对光纤通信系统性能，将ACO-OFDM与一些调制技术相结合来进一步提高系统宽带效率、降低光发送功率等，以提升光纤通信系统的性能(In AWGN channel model, compared to ACO-OFDM and other modulation schemes for optical fiber communication system performance, the ACO-OFDM with some modulation techniques combined to further improve the system broadband efficiency and reduce light transmission power so as to enhance the performance of optical fiber communication systems)

for compression of images using watermarking

用于车牌识别技术中图像分割，对比几种微分算子的边缘检测和形态学分割(License plate recognition technology for image segmentation, compared to several differential operator edge detection and morphological segmentation)