d-a digital-analog 中文意思是什麼

d-a digital-analog 解釋
數模
  • d :
  • a : an 用在以母音音素開始的詞前〉 indefinite art 1 〈普通可數名詞第一次提到時，冠以不定冠詞主要表示類...
  • digital : adj. 1. 手指的；指狀的。2. 數字的，數據的。n. 1. （鋼琴等的）琴鍵。2. 手指。
  • analog : n. ＝ analogue.
  1. The software radio consists of several parts as follow : analog front end, broadband a / d and d / a, digital upper / down converter, high - speed signal processor and so on

    它由以下幾個部分組成:模擬前端，寬帶a / d和d / a ，數字上/下變頻器，高速數字信號處理器等。
  2. And the interfaces have analog input, analog output and digital input / output. we have used differently cards, such as pc - 6330d a / d card, pcl - 728 d / a card based isa bus, ipc - 5375 i / o card and so on. in addition, we select micro - stir switches and pressure sensors as sensor elements to inspect the system and choose relays and induction valves to control the bicycle pump and the motor

    總線採用isa內部總線；介面主要有模擬量輸入介面、模擬量輸出介面、開關量輸入輸出介面等，課題分別選用pc - 6330d型a d板卡、基於isa總線的型號為pcl - 728的d a板卡、型號為ipc - 5375的i o板卡；另外，課題選用了微動式行程開關、壓力變送器作為傳感元件檢測系統，選用繼電器、電磁控制換向閥實現對氣缸、電機的控制；採用vc + + 6 . 0編制控制軟體，實現了纖維鋪放技術的計算機控制。
  3. In addition, a low - pass filter can be employed prior to the digital - to - analog ( d / a ) stage to smooth the stairstep effect resulting from the combination of a low sampling rate and quantization

    另外，在數模轉換（ d / a ）級前用低通濾波器可以平滑因低的抽樣頻率和量化造成的階梯效應。
  4. The subject has mainly finished designing and debugging software and hardware of a / d decode module, fpga video processing module, video data frame deposit module, base clock produce module, d / a encode module, i2c bus control module, etc. a / d decode module gathers analog tv signals and realize video decode ; fpga video processing module deals with the data after decoding and produces systematic logic control signal ; video data frame deposit module offers the buffering area to a large n umber of high - speed video data ; base clock produce module through input basic video signal offers system accurate relevant synchronous signal ; under control of video processing module d / a decode module convert digital video data into compound tv signal which can be shown in tv directly ; i2c bus control module is used to initialize the chip of system by simulating i * c bus timing

    本課題主要完成了a d解碼模塊、 fpga視頻處理模塊、視頻數據幀存模塊、基準時鐘產生模塊、 d a編碼模塊、 i ~ 2c總線控制模塊等部分軟、硬體設計及調試。其中a d解碼模塊採集模擬電視信號實現視頻解碼； fpga視頻處理模塊對解碼后的數據進行去噪處理的同時還負責系統的邏輯控制；視頻數據幀存模塊為大量高速的視頻數據提供緩沖區；基準時鐘產生模塊通過輸入基準視頻信號為系統提供精確的相關同步信號； d a編碼模塊在視頻處理模塊的控制下把數字視頻數據轉換成復合電視信號供顯示用： i ~ 2c總線控制模塊模擬i ~ 2c總線時序實現對系統中編、解碼晶元的初始化。
  5. The synchro / resolver signal transmit & receive card is the most important and difficult part which used special a / d and d / a ( axis angle converter ) to make conversion between the analog singnals related to angle and its digital counterpart, thus solve the issue of stimulation and test of synchro / resolver signal ， improved the test precision and automatic degree

    其中同步器卡的開發是難點和重點，它採用特殊的數/模、模/數轉換器件?軸角轉換器，實現了角位-數字信號相互間的直接轉換，解決了隨動系統性能檢測中三相同步器信號激勵與同步器信號/分解器信號數字化檢測問題，有效提高了系統的自動化程度和檢測精度。
  6. Led digital multi - parameters instrument in motorcycle is a new digital instrument. it consists of a 4 - ch a / d converter, two microprocessors, a 2 - wire serial eeprom, an optocoupler, led displays and etc. there are two displays : an analog - display, a digital - display. all displays are under the control of the microprocessor

    摩托車用《新型數字式儀表盤設計及關鍵技術研究》項目是一項非常復雜的系統工程，通過設計及關鍵技術的研究需要解決： 1如何用最簡的演算法對車速和發動機轉速在滿足工程需要的精度下進行實時測量？
  7. This paper describes a genaral introduction on digital - analog converter study of domestic and aboard, analysis of d / a converter principle and structures, and the analyses of different converting type such as current converting and voltage converting. a monolithic current - output converter is presented

    本文較為全面的介紹了數字/模擬轉換器（ d / a轉換器）的國內外動態，分析了d / a轉換器的基本原理和結構，對電流轉換和電壓轉換d / a轉換器進行了較為詳細的分析。
  8. It is widely used in many circuits, such as high precise comparators, a / d and d / a converters, drams, flash memory circuits, and other analog or mixed circuits. therefore, it is significant to develop a voltage reference circuitry that is compatible with digital cmos technology and can be integrated into a system on a chip ( soc )

    基準電壓源（ voltagereference ）是超大規模集成電路和系統的重要組成部分，應用於高精度比較器、 a d和d a轉換器、隨機動態存取存儲器、閃存電路等多種電路和電路單元，亦為系統集成晶元（ soc ， systemonachip ）所廣泛採用。
  9. Tms320c5402dsp was used in the design to replace six scm those was used in the automatic biochemical analyzer now and to control system, cpld epm7128 offer logic circuit to the system. a 16 - bits high - speed a / d conversion device a / d976a replaced a / d574 to complete digital - analog conversion

    本系統設計中採用一片高性能的dsp （數字信號處理器） tms320c5402代替了目前生產的全自動生化分析儀的六個單片機完成系統控制，用可編程邏輯器件epm7128提供所需的邏輯信號，採用16位高速a d轉換器ad976a取代以往的ad574完成模數轉換。
  10. The hardware designing include the interface with engine controller, such as d / a conversion. we chose the ad75089 which was produced by ad corp. this is a parallel port digital to analog conversion, and i give the presentation about its structure and connection scheme. in order to resolve the contradiction between faster computation and slower display, a buffer storage also needed

    第二部分詳細陳述了高速數據傳輸卡的軟、硬體設計過程，硬體設計包括dsp與pci總線的介面、 dsp與外部控制器的介面、以及電路卡上的擴展數據緩沖區的設計，並使用專門的工具軟體protel繪出全部硬體電路的設計原理圖。
  11. In paper we designed the processing circuits of magnetic encoder, designed the magnified circuit, the signal collection circuit and the d / a conversion circuit are designed. then magnetic encoder can output two different type signals : digital signals and analog signals, the two type signals are corresponding

    對磁編碼器的信號處理電路進行了設計，設計了磁頭的放大比較電路、單片機信號採集電路和d a轉換電路，設計了單片機信號採集和d a部分的程序，使編碼器能在輸出數字信號的同時輸出與數字信號一一對應的模擬信號。
  12. This method is especially simple and easy to implement. furthermore, it fully capable of tracking digital control signals carried by 4 ~ 20ma analog signals ; during software development phase, we have completed signal collecting, lcd displaying, d / a converting of hart signal and ieee - 754 32 bit float point conversion. we used a simplified method in ieee - 754 32 bit compatible float point conversion based on the 24 bit integer and 16 bit decimal computation

    在hart信號的解調外圍電路中採用遲滯比較電路實現波形的轉化，這種方法簡單、易實現，完全能夠跟蹤加載在4 20ma模擬信號上的數字控制信號；在軟體設計中，完成了hart信號的採集編程、 lcd顯示編程、 d a轉化控制編程和ieee - 75432位浮點數的轉化編程， ieee - 75432位浮點數轉化編程採用的是在最多滿足24位整數位和16位小數位的基礎上的一種簡化演算法。
  13. In the blue print of the digital, make sure of the logarithmic amplifier, a / d / a converter and fpga realize the if amplifier, big dynamic range agc, detect and video process same as that in the blue print of the analog

    在數字方案中，筆者結合軟體無線電技術，通過使用對數放大檢波器、 a / d / a轉換器以及fpga軟體實現了同樣的中頻放大、大動態范圍的agc控制、以及檢波、視頻信號處理等功能。
  14. Continuous - time filter needn ’ t a / d switch, data processing, d / a switch technique and so on to finish filtering function with analog signal like digital filter. and it needn ’ t switch action to sample data in the discrete time with analog signal like switched capacitor filter. so continuous - time filter has several advantages, such as high processing speed, simple circuit configuration, and low power consumption

    對每種方法都進行了詳細的推導，總結了每種設計方法的設計步驟、適用場合，舉例用每種設計方法對具體濾波器進行了電路設計、靈敏度特性分析、失真特性分析等，並用計算機模擬驗證了電路方案。
  15. The thesis includes the design of hard circuit, pcb ( printed circuit board ), driver and application soft involving a / d board and d / a board. the detailed functional modules consist of multiplex signals select module 、 analog digital conversion module 、 digital analog conversion module 、 pci protocol conversion module 、 driver and magnifying module 、 control logic 、 clock circuit and configuration circuit. the importance of the thesis is a / d board

    本課題包括硬體電路、印刷電路板（ pcb ） 、驅動程序和應用軟體的設計，涉及a / d板和d / a板兩大塊部分，具體的功能模塊包括多路信號選擇模塊、模數轉換模塊、數模轉換模塊、 pci協議轉換模塊、驅動放大模塊、控制邏輯、時鐘電路和配置電路，其中重點是a / d板部分。
  16. Then, by pass amplifier, filter and a / d transform, the analog signal is transform into digital signal. with the control of scn, the digital signal is send into computer

    信號處理系統包括ccd光電轉換、差分放大、 a / d轉換等，並在單片機的控制下，將數字信號輸入到計算機中。
  17. Based on introduction of the isolated analog signal transmission, this paper made analysis and comparison of a variety of isolated technologies, and put forward a novel digital isolating method based on serial interface d / a converter

    針對系統在不同模塊之間信號隔離傳輸的問題，對各種模擬信號傳輸的方式進行了性能比較，研究了模擬數字式變換傳輸的方式的各種應用。
  18. For the 8 - bit clamp circuits mainly including an 8 - bit dac ( digital analog converter, which can be shown as d / a ), which function with a matching an op amp that turns the single ended signal to a full differential, so it is the point emphasized in this paper

    因為8 bit箝位電路最主要由一個8位的d / a （ digitalanalogconverter可簡寫為d / a ）和一個與之相配的單端變全差分信號的運放來實現。因此，這也是本文著重論述之處。
  19. High performance digital - to - analog ( d / a ) converters find applications in the areas of video and wireless communications, such as hdtv and gsm. so, it is useful to make a careful study of high - speed dac

    無線通訊和視頻領域，尤其是比較熱門的比如hdtv和gsm ，對高性能高速dac的要求更加迫切，所以針對高速dac的研究是必要的。
  20. In this thesis, firstly, the main protocols and their functions, the application profiles of bluetooth technology are introduced. the hci protocol is analysized emphasesly ; secondly, the 4 - channel 10v analog to digital conversion ( a / d ) bluetooth adapter, 4 - channel 10v digital to analog conversion ( d / a ) bluetooth adapter, rs232 serial port bluetooth adapter are developed. the hardware and software of them are realized and test ; thirdly, the test tool software for bluetooth adapter is designed. the displaying and saving of data with vc + + 6. 0 multithread in pc is completed, then the wireless serial port communication between pc and micro - controller unit ( mcu ) is implemented, the data results of those adapters are acceeded ; finally, the bit - error - rate testing software of bluetooth communication system is designed, and the bit - error - rate test results of bluetooth adapter in labortary are acquired and illustrated also

    其次提出了硬體設計方案:四通道10v模擬/數字（ a / d ）藍牙適配器、四通道10v數字/模擬（ d / a ）藍牙適配器， rs232串口通信藍牙適配器。在此基礎上完成了硬體電路和軟體程序的設計和調試。再次，設計了藍牙適配器測試工具軟體，在pc機上用vc6 . 0 + +多線程編程完成對傳輸數據的保存與顯示，實現了pc機與單片機的串口無線通信，並給出了藍牙適配器測試結果。
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