d-d digital-digital 中文意思是什麼

d-d digital-digital 解釋
數數
  • d :
  • 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。
  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. Due to the hardware characteristic ' s limitation, such as the poor speed of a / d, d / a conversion and dsp process, the most part of sr system adopt middle course. that is to say, by using the special digital converter or running relevant arithmetic, it converts the radio signal to intermediate frequency signal and completes the base - band signal process that is n ' t the veriest sr and is named " software defined radio ( sdr ) "

    由於受到硬體性能如a d 、 d a及dsp晶元處理速度的限制，目前的軟體無線電系統多採用折中的實現方案，增加專用的數字變頻器或者運行數字變頻演算法，將射頻信號變頻到中頻，然後再進行基帶信號處理，這樣的軟體無線電系統又被稱之為「軟體定義無線電」 ，它並不是真正意義上的軟體無線電。
  3. D. analog - to - digital signals conversion technology. e

    4模擬信號與數字信號間的轉換。
  4. The dissertation makes a presentation of the research and realization of the 3 - d digital terrain map. this project is made to meet the development of the battlefield armored reconnaissance tank system and its training - simulation system

    本文介紹了為我軍裝甲機械化部隊坦克師戰場裝甲偵察系統發展以及模擬訓練系統所需而研製的三維電子地形圖的數據生成和三維動態顯示系統。
  5. D. c. digital ohmmeter

    直流數字式歐姆表
  6. The design of hardware module includes a / d converter, ddc ( digital down converter ), duc ( digital up converter ) and dsp. the design and application of ad6640 and ad6624 are fully discussed in this part. the design of software module includes the parameter design for ddc filter and the base - band signal processing of dsp

    收發信機硬體設計主要包括： a d 、 d a轉換器、數字下變頻器（ ddc ） 、數字上變頻器（ duc ）以及dsp ，論文詳盡介紹了a d器件ad6640 、 ddc器件ad6624和dsp器件tms320c5410的設計和應用；收信機軟體設計主要包括： ddc濾波器參數設計和dsp的基帶信號處理，給出了dqpsk調制、解調演算法的dsp實現。
  7. The digital automatic terminal information system d - atis and digital volmet d - volmet broadcast services officially commenced on 19 april 2001

    數據化自動航站情報及遠航氣象情報廣播服務於二零零一年四月十九日正式啟用。
  8. The digital automatic terminal information system ( d - atis ) and digital volmet ( d - volmet ) broadcast services officially commenced on 19 april 2001

    數據化自動航站情報及遠航氣象情報廣播服務於二零零一年四月十九日正式啟用。
  9. . pcl - 711b card offers many functions such as a / d conversion, d / a conversion, digital input and output and so on. in order to saving time, lightening the diffculty of programming, i take the programming method of driver level to control pcl - 711b card using visual basic6. 0 language

    Pcl ? 711b卡提供了a d轉換、 d a轉換、數字量輸入和數字量輸出等i o功能，為了縮短開發時間，減輕開發的難度，本文採用了visualbasic6 . 0對pcl ? 711b卡進行驅動程序級編程來控制該卡。
  10. Use the import part of an apparatus and strict technique to make sure the quality. use the technology of dsp digital shift frequency, and adopt high speed of a d, d a switch electrocircuit

    反饋消除技術，自動尋找反饋嘯叫頻點，液晶顯示嘯叫頻率，並自動形成數字濾波器，消除嘯叫頻率，能有效提升話筒增益
  11. A d - analog to digital

    模擬數字信號轉換
  12. Maritime navigation and radiocommunication equipment and systems - vhf radiotelephone equipment incorporating class " d " digital selective calling - methods of testing and required test results

    海上導航和無線電通信設備及系統.採用" d "級數字選擇呼叫的甚高頻無線電話設備.試驗方法和要求的試驗結果
  13. In this scheme digital demodulator is used to detect ifog ' s signal, digital phase ramp modulator is used as feedback controlling and digital filter is used to limit noise and lower the bits of a / d ? d / a converters

    閉環方案中，採用數字解調方案進行信號檢測，採用數字相位階梯波調制技術進行反饋控制，採用數字濾波、數值濾波降低噪聲和消除a / d 、 d / a轉換死區誤差。
  14. Consulting relevant reference and related theories in software radio, this thesis is working on technologies of digital channelized receivers, including the theories on a / d sampling, digital down converter, multi - velocity signal processing, polyphase filter and uniform dft filter bank

    本文針對電子偵察系統數字化實現，對數字式通道化接收機的相關技術進行了研究:包括a / d采樣的理論、數字下變頻相關理論、多速率信號處理的理論、多相結構優化抽取濾波、均勻dft濾波器組。
  15. A system design of the circulation function therapeutic instrument of brain is presented in this paper. an integrated prototype is composed of at89c55 used as system controlling module and a / d, d / a converter and liquid crystal display device used as a terminal display module to realize the output of dynamic load and permanent flow through digital synthesis

    本文提出了一種設計智能腦電治療儀的系統方案，以at89c55為核心控制模塊，輔以d / a 、 a / d成為全反饋閉環系統，使用液晶顯示器為終端顯示設備，實現數字合成動態負載恆流輸出。
  16. Computation method of fractal dimension for 2 - d digital image

    二維數字圖像分形維數的計算方法
  17. For the teaching the hardware pwm inverter is designed, including the choice of power module, filter tache, auxiliary power supply, brake unit and protection circuits. in addition data sampling system is contrived with encoder and current / voltage sensors. the control circuit with tms320f240 for the core is presented at last. the circuit includes memory extension, d / a converter digital i / o interface and the interface of the serial port. the way of space vector pwm realization is briefly introduced in this paper

    接著，設計了pwm電壓型逆變器，其中包括主迴路功率模塊與濾波環節、控制電源、制動單元及保護電路設計。另外還利用霍爾元件與編碼器設計出數據採集系統。最後，給出了基於tms320f240的最小系統，包括存儲器擴展、串口擴展、數字i o介面以及空間矢量pwm的實現。
  18. First in chapter 1, we introduce the background of the 3 - d digital terrain map, discuss the resolution of the data source of the 3 - d digital map and propose an idea that retrieving 3 - d data with b - spline surface interpolation based on the contour line distilled from paper map

    首先在第一章中介紹了三維電子地形圖系統的研製背景，簡要介紹了解決目前三維顯示數據來源的方法，提出了從紙地圖的等高線提取三維數據的思路，並對整個方案的實現框架作了簡要的介紹。
  19. Based on above - mentioned schemes, the power detection system based on tms320vc5410 is designed, which realizes collection, a / d, digital signal processing. keyboard. display and uart ? the ad73360 gather chip commonly used in power system is used in front of the power detection system, and the circuit of frequency multiplication phase - locked is consisted of phase - locked loop device ? d4046 and frequency division device cd4060 to produce the gather signal of ad73360 frequently, the gather wave and re sult can be displayed on lcd

    基於上述方案，本人設計開發了基於tms320vc5410的電力採集檢測系統。基本實現了採集、 a d轉換、數字信號處理、鍵盤顯示、異步通信等系統軟硬體設計。該系統前端採用電力系統常用的ad73360採集晶元，鎖相倍頻電路由鎖相環cd4046與分頻器cd4060一起構成，產生ad73360採集觸發信號。
  20. Dolby sr - d dolby sr digital

    杜比數字頻譜記錄
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