direct digital control computer 中文意思是什麼
direct digital control computer
解釋
直接數字控制計算機-
This paper mainly focuses on the noise limiting by means of the direct sequence spread spectrum ( dsss ) and the analysis of the transmission performance of the plc and some digital modulation technology. the contents of the paper is as follows : 1 ) the technical feasibility is proved after simulating noise limiting principle of dsss by means of systemview, the simulation software ; 2 ) a kind of band pass filter ( bpf ) is realized according to the requirement of filter and the principle of butterworth approximation, which satisfies the index of performance of dsss. 3 ) the low voltage plc system includes the sc1128, the specific modulation / demodulation ic, the bpf filter and other circuit components, furthermore, the control function of system is realized by means of the personal computer and the microcontroller
本課題在對低壓電力線的傳輸特性和數字調制技術進行分析的基礎上，將通信理論中的直接序列擴頻技術（ dsss ）用於解決低壓電力線通信的干擾問題，主要研究內容如下： （ 1 ）用通信模擬軟體systemview對dsss技術的通信和抗干擾原理進行模擬分析，分別對時域和頻域下採用dsss技術前後接收信號的頻譜進行分析，驗證dsss技術在本系統中的可行性； （ 2 ）由dsss技術對濾波系統的要求，根據濾波理論分析了巴特沃思型濾波器的逼近原理並設計了合適的濾波電路； （ 3 ）用調制解調晶元sc1128和自行設計的濾波器加之輔助外圍電路，構造出低壓電力線載波通信系統，並採用atmel公司的單片機設計了接收和發射電路的微控制器； （ 4 ）分別對採取抗干擾措施前後輸入和輸出信號進行對比實驗，並對結果進行分析，驗證了dsss技術對干擾信號的抑制作用。 -
Based on the quick development of computer network, this thesis deals with how to apply network technology to civil and architectural engineering. the finished research contains as follows : the research on reraote - network - monitor - system, the realization of the data collection of ddc ( direct digital controller, multi - loop data circuit monitor ), the communication, the real time control of remote network. moreover, the remote - network - monitor - system is applied in the engineering practice in which monitoring the security of high framed girder and plank
其中包括：研究了遠程網路檢測系統基本結構，實現了下位機（多路數據巡迴檢測儀）現場數據採集、下位機與上位機通信、遠程網路實時控制採集過程等；成功編制了下位機與上位機通信軟體和用於動態更新、存儲數據的數據庫系統；將遠程網路檢測系統應用於工程實例，完成了高層建築框支梁安全性監測、不抽芯板專利技術檢測。 -
One - wire bus is a new technique based on cdma and std. it has simple structure, low cost, direct control via computer or microprocessor and simple program. the new type of one - wire digital sensor, which is integrated with thermometer, a / d, controller, rom, ram, can communicate with server computer through 1 wire and without any other accessories, moreover, 64 sensors can share one single line which makes system structure concise and easy
新型的單總線數字傳感器集成了溫度檢測、 a d轉換、控制器、 rom 、 ram 、單線雙向數據傳送等功能於一體，只需要1根數據線，無需其他輔助器件即可實現傳感器與主機間的數據通訊，而且多達64個數字傳感器可以共用該數據線，使系統間的連接非常簡潔，適應于低成本的多點測試、集中控制系統。 -
Namely along with the rapid development of power electronics technology, computer technology and automatic control technology, the electric transmission technology is being faced with a history revolution, it has become development trend that transferring speed replaces direct current accent speed and computer digital control technology replaces the simulating control technology
隨著電力電子技術、計算機技術、自動控制技術的迅速發展，電氣傳動技術面臨著一場歷史革命，即交流調速取代直流調速和計算機數字控制技術取代模擬控制技術己成為發展趨勢。 -
A direct digital control ( ddc ) system was adopted, which can grab the dynamic image of fruits in real time, and send the results of image processing to the parallel port of computer, then control several step motors " status at the same time
本研究採用計算機直接數字控制方式，對動態水果圖像進行實時採集，並通過計算機的列印埠輸出圖像處理結果，實現同時對多個執行器的動作狀態進行控制。
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