virtual data circuit 中文意思是什麼
virtual data circuit
解釋
虛數據電路-
Lastly, the hardware circuit of digital acquisition system is designed, and the programs for system controlling and adaptive filter arithmetic are designed. eeg can be observed clearly after d / a switching. at the same time, eeg data is transmitted to the upper machine by serial communication, so we can see eeg waveform by virtual instrumentation
在此基礎上，針對固定濾波器存在的問題，提出了將自適應濾波技術應用於腦電測試中，並進行了理論研究和模擬研究，設計出了能較好地濾除50hz強干擾的自適應陷波濾波器和去基線漂移的自適應濾波器。 -
Socket function mainly realizes setting up and initializing service unit socket, initializing service unit and service unit serial and so on. bind funcion primarily binds local address and port for the socket. listen function is to evaluate the max length of server ’ s listening queue. connect function and accept function set aside rate ahead, infrom user ’ s request of establishing virtual circuit to suna, cooperate with suna to establish the connection between client and server, return the result. we make use of three handshake with data protocol and virtual circuit mode, in this way, when we translate data, we can look up communication course according to virtual circuit number, at the same time, there aren ’ t source ip address and port, end ip address and port in the head of data package, the speed of translating data advances in a certain extent. send function and recv function is to send data collaborating with suna, and copy data from the receiving queue of socket to user ’ s buffer. close function cooperate
Socket （ ）函數實現創建、初始化服務元套接字，初始化服務元及服務元序列等。 bind （ ）函數為套接字綁定本地地址和埠號。 connect （ ）和accept （ ）函數主要是根據用戶要求預留帶寬，將用戶的建立虛電路請求轉達給服務元網路體系，協作服務元網路體系採用捎帶數據的三次握手協議建立虛電路，並告訴用戶處理結果，一方面，捎帶數據的三次握手協議在一定程度上可提高數據傳輸速度;另一方面，採用虛電路方式，使得數據通信可直接根據虛電路號查找相應的通信進程，而且數據包的包頭中省去了源ip地址、埠號和目的ip地址、埠號，提高了數據傳輸速率。 -
These sensor are increment rotary encoder ~ absolute rotary encoder and resolver transmitter, at the same time, design and make signal disposal ii - 1 circuit for three sensor, the function of signal disposal circuit is not only disposing signal of sensor, but also collecting data from sensor via microprocessor and sending these data to pc via serial communication. the pc receives these data and displays the working status of experiment bench via virtual instrument software
並製作了三種傳感器的信號處理電路，信號處理電路除了完成對傳感器信號的處理，還通過微處理器採集傳感器的信息，並通過串列通訊將這些信息送于上位監視計算機，上位監視計算機接收這些信息，並通過虛擬儀器軟體顯示系統的工作狀況。 -
At last, we gave the circuit connection method of web browse function and ethernet / rs232 gateway function and the detailed resolvent to improve the results of theory research. the result indicates that it is feasible to access internet with the method of micro controlling unit and virtual software package. this method will provide a new kind of resolvent to appliance accessing intemet, long - distance controlling and long - distance data collection
最後給出了實現網頁瀏覽功能和ethernet rs232網橋功能的實驗線路連接方法及具體實驗方案，來證明理論研究的結論。實驗結果表明採用8位微控制器與虛擬軟體包相結合的方式接入internet是完全可行的，這將為家電上網，遠程控制，遠程數據採集等提供一種新的解決方案。 -
Information technology - international standardized profile ra - relaying the connectionless - mode network service - definition of profile ra51. 1121, relaying the connectionless - mode network service between csma cd lan subnetworks and psdns using virtual calls over a digital data circuit csdn leased line permanent access
信息技術.國際標準華輪廓ra .轉接無連接方式的網路服務.第9部分: ra51 . 1121輪廓的定義.數字數據電路csdn租用的線路固定訪問的虛擬呼叫轉接csma cd lan子網與psdns間的無連接方式的網路服務 -
In the course of design, we fully consider the actual conditions on the railway and take a series of corresponding measures to the concrete problem. such as we select high - accuracy microconvertor and have the converted function in succession data collecting system chip aduc812, design v / f circuit and external a / d circuit. in anti - interference of the hardware, we try to disperse each function module to avoid interfering each other, adopt photoelectric isolated technology to dispel the circuit connection of input and output. in controlling we import arithmetic mean into strain wave algorithm and real computing technology of virtual value for sample treatment of data, that is using the software to smooth away interfere error and to calculate actual value, thus it makes the precision of the data improve greatly
在設計過程中，根據系統要求，充分考慮鐵路上的實際情況，針對具體問題採取了一系列的相應措施，如在器件選擇方面選用高精度microconvertor系列、具有adcdma連續轉換功能的數據採集微控制器晶元aduc812 ，設計了v f變換電路和外部a d轉換電路；在硬體抗干擾方面，將每個功能模塊盡量分散獨立開來以避免相互干擾、採用光電隔離技術消除輸入輸出通道上的電路聯系；在控制方面對于采樣數據的處理引入了算術平均值濾波演算法和真有效值的計算方法，即通過使用軟體來濾除系統中有干擾造成的誤差並計算真值，從而使數據的準確性得到極大地提高。 -
The system makes up of two parts : subordinate part is the measure instrument, it also is principal part ' s data collection equipment, it makes use of microcontroller ' s advantage, it intelligentizes the management and data collection circuit, it has liquid crystal display and 4x4 keyboard, it can work alone on the field, so it is very convenient and ensures the credibility of data sampling ; principal part is virtual instrument software on personal computer, the software can be installed in notebook pc and work with subordinate part on the field, it extends the subordinate part ' s function, the teachers also can use it as demo teaching
系統的設計借鑒了主從式虛擬儀器設計的思想，系統由主機和從機兩部分組成：從機部分即為光合、蒸騰速率測定儀，也是主機的數據採集器，它利用單片機功能全面的優勢，使調理電路和數據採集電路智能化，它配備lcd顯示器和4 4鍵盤，可以獨立野外測量，從而使虛擬儀器在保證數據采樣可靠的前提下，更加方便實用；主機就是pc機的虛擬儀器軟體，既可以安裝在筆記本電腦上，與從機組成便攜式儀器系統進行實地測量、處理數據，擴展從機功能，又可以作教學演示。 -
Firstly, a data acquisition circuit was designed, which is consisted of ad420, dac702 and ad7701. then, comparing with different usb control ics, an2131 was selected to achieve the control of data acquisition and usb communication. detailed rules to develop a usb device general purpose drivers were introduced, and the virtual instrument application software was developed basing on labview
首先是數據採集卡的製作，包括由ad420 、 dac702數模轉換晶元構成的模擬輸出通道，由ad7701 、 ad8200構成的模擬輸入通道;然後比較幾種不同的usb介面晶元，選擇帶usb介面的an2131微處理器實現數據採集的控制和usb傳輸功能;之後是usb設備驅動程序的開發和基於labview的虛擬儀器應用程序的設計。 -
With the vapid development of computer technology and the reducing of its price, using computer to realize data acquisition directly can make efficient use of system resource of computer. virtual instrument can be realized with perfect software and many kinds of function can be obtained. interface circuit design is the most important in realizing this function
隨著計算機技術的高速發展以及價格的降低，直接利用計算機實現數據採集可以有效地利用計算機的系統資源，配以完善的軟體，可以實現虛擬儀器，完成多種功能，但是在實現這一功能的關鍵是介面電路設計。 -
Sample error probably caused from data collection circuit of rf virtual frequency spectrum analyzer instrument was emphasized, and some kinds of selectable resolution scheme were presented, then these schemes of advantages and disadvantages were compared and summarized by the way of theory analyse, matlab simulation and practice validate and so on, at last, the optimum scheme of rf virtual frequency analyzer instrument was decided and adopted
重點對虛擬射頻頻譜分析儀中的數據採集電路可能造成的采樣誤差進行了分析，提出了幾種可供選擇的解決方案，經過理論分析、 matlab模擬和實際驗證等手段，對這幾種方案的優缺點進行了比較和總結，並最終確定了其中最適合虛擬射頻頻譜分析儀的方案。 -
Service unit network architecture ( suna ) is a kind of network architecture based on service unit. suna is different of hiberarchy, it is concise, extensible and can be easy to be realized. this paper states the virtual circuit architecture prototype host based on suna, expatiates on collectivity design, module patition, the function which all modules provide with and the services for user about prototype host based on suna. the prototype host provides user with two kinds of data flow service, one is dependable data flow service which uses predigested slip window mechanism to guarantee the dependence and sequence of data flow, the other is undependable data flow service. to transfer data in network must pass ui, network communication protocol and physics network. ui is the bridge between the user and network communication protocol
服務元網路體系結構是一種基於服務元的網路體系結構，不同於層次結構，具有簡潔、可擴展和易實現的特點。本文論述了基於服務元網路體系結構的虛電路結構的原型主機，詳細闡述了原型主機的總體設計、模塊劃分、各個模塊實現的功能以及為用戶提供的服務。原型主機為用戶提供兩種數據流服務，一種是可靠的數據流服務，採用滑動窗口機制來保證數據流的可靠性和有序性;一種是不可靠的數據流服務。 -
This dissertation grounds on the development of pattern i / o module, some key techniques including the design of a register _ based interface circuit and the data generating and sampling circuit are discussed explicitly. on the basis of virtual instrument software architecture, the programme of the instrument driver and application software are discussed detailedly. and some idea and experience developed by the author in the course of debugging and testing the circuit are discussed also
本文立足於vxi總線自動測試系統圖形i / o模塊的研製工作，在vxi總線系統體系結構基礎上，介紹了vxi總線圖形i / o模塊介面電路和數據輸入輸出功能電路的實現方案;在虛擬儀器軟體構架visa的基礎上，根據測試任務完成了vxi總線圖形i / o模塊儀器驅動器和應用軟體的設計與編寫;對驅動程序調試過程中出現的問題，進行了較深入的分析，並提出了實際的解決措施。 -
This technique is considered as the future trend of instrument technology. the virtual instrument is one of computer instrument systems and it is based on the hardware of computer. the function of virtual instrument is defined and designed by consumer. the virtual instrument is with virtual panel and the testing function is implemented by software. the traditional instrument implements data analyzing, data processing and data display by hardware circuit, but the virtual instrument implements those functions by computers. though the collection of signal is done by the actual probe, data collection board and the i / o of computer. the virtual logical analyzer is made by the technology of virtual instrument
所謂虛擬儀器，就是在以計算機為核心的硬體平臺上，其功能由用戶設計和定義，具有虛擬面板，其測試功能由測試軟體實現的一種計算機儀器系統。它將傳統儀器由硬體電路實現的數據分析、處理與顯示功能，改由功能強大的計算機來執行，而信號的採集，仍然利用實際的探針，數據採集板和計算機i / o系統相結合的思想。虛擬邏輯分析儀就是按照虛擬儀器思想設計而成的。 -
The function of virtual circuit module includes creating virtual circuit, transmitting packet along virtual circuit, canceling virtual circuit and control of data flux
虛電路模塊實現的功能是創建虛電路表，處理虛電路管理包和數據包。 -
Based on scheme composing, i finished the designs and tailors of the virtual instrumentation hardware architecture ? the analog signal transmission circuits : the designs and simulations of signal processing card and data acquiring card, the tailors and debugging of their printing circuit cards
完成虛擬儀器硬體?模擬信號傳送電路的設計和製作：完成信號調理電路板和數據採集卡電路的設計和模擬，製作印製電路板，並調試完成，達到了設計要求。 -
According to the static experiment of one dimensional psd, the restraint circuit of background light of psd is improved and two dimensional measuring device is completed. moreover the virtual instrument is employed as measuring platform to acquire and process data. the paper can be a reference of the three dimensional coordinate measurement
在一維psd位置檢測靜態實驗裝置的基礎上，設計完成了二維檢測裝置，改進了psd背景光的抑制，並利用虛擬儀器作為測量平臺進行二維空間測量和數據處理，為三維研究奠定了理論和實驗基礎。 -
Based on the methods of hardware circuit and line ro circle interpretation, a software layered idea is proposed. in this section, the thesis discusses detailedly the realization routing which managers the bottom hardware using the virtual device driver on the flat of win95 / 98 / 2000. by this way, some probrem, such as time interpretation and data sampling, can be settled in the cnc sytem of win32
在上面討論的基礎上提出了軟體的分層設計思路，在這一部分詳細的討論了在win95 98 2000平臺上利用設備驅動程序對底層硬體管理的具體實現途徑，解決了在win32下cnc系統中最重要的定時插補與數據采樣等問題，然後在此基礎上編寫了函數庫，供給第三方使用。 -
The difficult part of the whole system is : the design of the interface circuit, the virtual device driver of the data collection card hy - 6070c, the design of the flaw determinant algorithm and the design and operation of the database
整個系統設計的關鍵在於：介面電路的設計、 hy - 6070c數據採集卡虛擬驅動程序的編寫、缺陷判定演算法的設計、數據庫的設計和操作。
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