学习笔记

http://v.163.com/movie/2011/8/L/S/M8AROL7GG_M8ARSNULS.html some of the properties of Fourier tansform and indicate how those properties are used for a variety of things.a synthesis equation(x[n]

two particularly significant ones as I mentioned at the time are the modulation property and convolution property.flows more or less directly from the convolution propertyBoth for continuous time

http://v.163.com/movie/2011/8/G/V/M8AROL7GG_M8ART6JGV.htmlIn this lecture, we begin a discussion of the topic of modulation, for example, it forms the cornerstone for many communication systems. A p

http://anony3721.blog.163.com/blog/static/51197420111129503233/ 即以此功德，庄严佛净土。上报四重恩，下救三道苦。惟愿见闻者，悉发菩提心。在世富贵全，往生极乐国。古人云：基础不牢，地动山摇。勿在浮沙筑高台。此话真不假，比如MATLAB中下标从1开始而物理概念t从0开始，结果往往会差一点，做FFT后结果会莫名其妙的差一点，做仿

Signal: anything contains information信号是什么？包含信息的东西为什么要信号处理？1.原先的信号不适合传达信息2.一般情况下我们不能通知信号源改变信号3.在接收后处理为什么是数字信号？1.很多信号转变成电压随时间变化的函数，比如speech，在每个即时时间，信号可以被找到，所以有了连续时间信号（模拟信号）。大部分现实世界的信号是连