Reference: AASM (2007). The AASM Manual for the Scoring of Sleep and Associated Events: Rules, Terminology and Technical Specifications. (Westchester: American Academy of Sleep Medicine). 绿色部分来自:http://wenku.baidu.com/link?url=7DQzUI9iM74iN10GrWGvA2i
first,I wish you a happy new year, and study in spring festival’s eve means you are hardworking,haha. I write in two languages. One passage write in Chineseone passage translate into English. My English is poor., If I write some thing wrong, welcome
从我们学到的知识了解到,我们的单片机是一个典型的数字系统.数字系统只能对输入的数字信号进行处理,其输出信号也是数字信号.但是在工业检测系统和日常生活中的许多物理量都是模拟量,比如温度.长度.压力.速度等等,这些模拟量可以通过传感器变成与之对应的电压.电流等电模拟量.为了实现数字系统对这些电模拟量的检测.运算和控制,就需要一个模拟量和数字量之间相互转换的过程.这节课我们就要学习这个相互转换过程.17.1 A/D和D/A的基本概念A/D是模拟量到数字量的转换,依靠的是模数转换器(Analog to