通信原理基础知识和理论

是从事通信 微波技术方面的理论支持 信源发出的消息虽然有多种形式， 但可分为两大类： 一类称为连续消息；另一类称为离散消息。连续消息是指消息的状态连续变化或是不可数的，如语音、活动图片等。离散消息则是指消息的状态是可数的或离散的， 如符号、数据等。  消息的传递是通过它的物质载体——电信号来实现的， 即把消息寄托在电信号的某一参量上（如连续波的幅度、频率或相位； 脉冲波的幅度、宽度或位置）。按信号参量的取值方式不同可把信号分为两类，即模拟信号和数字信号。

DSP 的开发解析和应用

Once you decide that a Digital Signal Processor is right for your application, you need a way to get started. Many manufacturers will sell you a low cost evaluation kit, allowing you to experience their products first-hand. These are a great educational tool; it doesn't matter if you are a novice or a pro, they are the best way to become familiar with a particular DSP. For ® instance, Analog Devices provides the EZ-KIT Lite to teach potential customers about its ® SHARC family of Digital Signal Processors. For only $179, you receive all the hardware and software you need to see the DSP in action. This includes "canned" programs provided with the kit, as well as applications you can write yourself in assembly or C. Suppose you buy one of these kits from Analog Devices and play with it for a few days. This chapter is an overview of what you can expect to find and learn.