【正文】 acquisition technology, people on the signal acquisition system performance have bee increasingly acquisition system in daily life has bee even more widespread, such as traffic detection, vital signs detection, telescope galaxy detection, detection of finished industrial production and so order to improve the function of the signal acquisition system, many domestic and foreign manufacturers to focus more on research capture card design has bee an important task of their design. . At present, domestic and foreign data acquisition system used in data acquisition card RS232, RS485 card, PCI card, ISA card. The data acquisition card to be plugged in to host the PCI slot or ISA slot, inconvenient use and the like. USB universal serial bus ( USB ) is a new interface mode, has convenient connection, supports hot plug and play, no need of external power supply, high transmission speed, the advantages of low power consumption. Therefore, data acquisition system based on USB in munication, remote sensing, intelligent meter, industrial automation and other fields has been widely used. This article is in the context of the actual signal acquisition signal acquisition system, focusing on the analysis of multichannel signal acquisition card software application written in VC++ control software, signal acquisition system, A/ D conversion, signal display, signal munication program design. Key words: acquisition card, multichannel, signal acquisition 常州工學(xué)院畢業(yè)設(shè)計(jì)說(shuō)明書 4 第 1章 緒論 ................................................................................................................................. 6 課題研究的背景和意義 ................................................................................................. 6 課題研究的現(xiàn)狀 ............................................................................................................. 6 國(guó)內(nèi)外研究主要成果及發(fā)展趨勢(shì) ................................................................................. 7 第 2章 采 集卡硬件設(shè)計(jì)部分 ..................................................................................................... 9 信號(hào)采集器概述 ............................................................................................................. 9 2． 1． 1 信號(hào)采集器 的產(chǎn)生 ......................................................................................... 9 2． 1． 2 信號(hào)采集器 的種類 ......................................................................................... 9 2． 1． 3 常用的 信號(hào)采集器的功能模塊 ..................................................................... 9 采集卡的實(shí)現(xiàn) 平臺(tái)（微控制器） ............................................................................... 10 2． 2． 1 微控制器的基本概念 ................................................................................... 10 2． 2． 2 微控制器的分類及工作原理 ....................................................................... 10 采集卡模塊說(shuō)明 ........................................................................................................... 10 2． 3． 1 模塊簡(jiǎn)介 ....................................................................................................... 13 2． 3． 2 性能 以及 接口說(shuō)明 ....................................................................................... 14 原理 ............................................................................................................................... 14 2． 4． 1 信號(hào)數(shù)據(jù)采集 ............................................................................................... 17 2． 4． 2 信號(hào)輸出 ....................................................................................................... 17 2． 4． 3 數(shù)字信號(hào)輸入輸出 ....................................................................................... 18 2． 4． 4 比較器、計(jì)數(shù)器及 PWM ................................................................................ 18 第 3章 多通路信號(hào)采集電路設(shè)計(jì) ........................................................................................... 20 動(dòng)態(tài)鏈接庫(kù)（ DLL） .................................................................................................... 20 編程函數(shù)及參數(shù) ........................................................................................................... 20 程序驅(qū)動(dòng)安裝說(shuō)明 ....................................................................................................... 23 界面展示 ....................................................................................................................... 26 常州工學(xué)院畢業(yè)設(shè)計(jì)說(shuō)明書 5 第 4章 信號(hào)采集與處理 ........................................................................................................... 28 信號(hào)的相關(guān)知識(shí) ........................................................................................................... 28 4． 1． 1 信號(hào)的 定義 及 分類 ....................................................................................... 28 4． 1． 2 信號(hào)調(diào)制 過(guò)程 ............................................................................................... 39 單通路信號(hào)采集與多通路采集的區(qū)別 ............................................................................... 30 模擬信號(hào)的采集 ........................................................................................................... 30 4． 2． 1 單通道信號(hào)采集實(shí) 物測(cè)試與分析 ............................................................... 32 4． 2． 2 雙通道信號(hào)采集實(shí)物測(cè)試與分析 ............................................................... 32 4． 2． 3 多通道信號(hào)采集實(shí)物測(cè)試與分析 ............................................................... 33 第 5章 結(jié)論 ............................................................................................................................... 35 致謝 ............................................................................................................................................. 36 參考文獻(xiàn) ..................................................................................................................................... 37 附錄 .................................................