ddc 中文意思是什麼

ddc 解釋
錘沖擴樁
  1. We also researched the frequency structure of ddc and interchanged the filter multiphase heft and taking out - operation using the theory of equivalent counterchange in multisampling system

    從理論上研究了數字下變頻的頻譜結構，利用多采樣率系統中結構的等效變換原理，將濾波器多相分量與抽取操作進行互換。
  2. Chapter 3 discusses the modules used in the fh - mpsk and fh - / 4dqpsk systems. these modules include : duc / ddc ( digital up converter / digital down converter ), nyquist flitter, burst start detection, interpolation module, pll ( phase locked loop ), pll error extraction, initial phase correction and the coding and decoding for tcm

    第三章主要討論了跳頻模式下fh - mpsk和fh - 4dqpsk系統中各個模塊的設計，這些模塊包括：上下變頻器、奈奎斯特濾波器、信號到達檢測、插值模塊、通用環路、各環路誤差提取方法、初始相位校正和tcm編譯碼。
  3. An system of cataloguing and retrieval of information is employed based on international classification standard - dewey decimal classification ( ddc ) and cataloguing rule - anglo - american cataloguing rules 2nd ed. ( aacr2 )

    資源中心內的館藏資料是根據國際標準的杜威分類法deweydecimalclassification （ ddc ）分類及按英美編目規則anglo - americancataloguingrules2nded . （ aacr2 ）編目。
  4. To utilize the advantages of dsp chips, the system should be computing sources economical. according to digital signal processing theory, the poly - phase fir can help reduce the workloads of the ddc / duc. therefore, adding the complex carrier mixers, the channelization system ( a method of using a single wideband facility to transmit many relatively narrow - bandwidth signals. by subdividing the frequency spectrum used in the wideband channel ) can be formed utilizing the characters of fft

    為了使開發出的軟體可以適用於高速dsp器件開發，節省系統資源，課題首先從數字信號處理的理論進行分析，得出可以利用抽樣率轉換的數字濾波器的特點，即多相濾波實現數字上下變頻計算負擔的減小，之後進一步將多相濾波器與頻譜搬移部分結合，通過公式的推導，得出可利用快速傅立葉變換的特點實現多路信號的通道化發射和接收的處理模型。
  5. Automatic controls, ddc controls, bms controls, compensated controls, flow controls, co2 controls, etc

    自動控制、數碼控制、樓宇自動控制、補償控制、流程式控制制、二氧化碳系統控制等
  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. Ddc technology based on band - pass sampling

    基於帶通采樣的數字下變頻技術
  8. Being based on the theory of the sdr, the topic researched the actual model of ddc

    本課題以軟體無線電的理論為基礎，研究了數字下變頻的實際處理模型。
  9. Digital down converter ( ddc ) is one of the core technologies in the software defined radio ( sdr ) receiver

    數字下變頻（ ddc : digitaldownconvert ）技術是軟體無線電接收機的核心技術。
  10. Conventional ddc down - converts digitally by digital mixing, filtering, and decimating ; on condition of high - speed a / d converters, the commercial ddc is no longer applicable

    傳統的ddc通過數字混頻、濾波、抽取實現數字下變頻，在高速a d和電子偵察環境條件下商用ddc不能使用。
  11. As a result, some key technologies of sdr such as modulation, demodulation, ddc and dug have been hot topics. in this paper, some key technologies of sdr are researched deeply

    於是，軟體無線電中的一些關鍵技術，例如：調制解調技術，數字上變頻，數字下變頻等成為該領域的研究熱點。
  12. 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。
  13. Parallel structure of poly - phase decomposition and parallel mixer is applied in the ddc circuit, it solves the bottleneck in mixing and increases the handle speed. the partition of the tuning channel according to the digital mixing sequence, and the ddc by means of decimating first, the low - pass filtering and mixing realize efficiently the down - conversion of the variable carrier frequency band - pass signal. according to the structure of the ddc and the requirement of the frequency

    短數據快速測頻演算法的具體實現:使用并行流水線的設計方法，提高了系統的數據吞吐率，在100mhz的系統時鐘下，能夠實時處理400mhz ~ 600mhz速率a / d采樣的數據，在64點采樣， 100mhz系統時鐘情況下，初次測頻佔用時間640ns ，以後每次測頻佔用時間縮短到160ns ，實時地提供多相濾波下變頻所需的載頻位置信息，縮短了接收機的調諧時間。
  14. The control system is a ddc system, which is the important part of the hulin heat _ supply control system. the hardware adopted in the system include industrial pc, signal input devices and signal output devices

    該系統是虎林市集中供熱監控系統的重要組成部分，是一個集中式數字直接控制系統。系統中採用的硬體主要有：工業控制計算機，信號採集設備和信號輸出設備。
  15. 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 baseband signal processing of dsp. and the realization of the viterbi channel decoding algorithm by dsp and the simulation of the burst at the transmitter are discussed

    模塊的硬體設計主要包括： a d轉換器、數字下變頻器（ ddc ）以及dsp ，詳盡討論了a d器件ad6640和ddc器件ad6624的設計和應用；模塊的軟體設計主要包括： ddc濾波器參數設計和dsp的基帶信號處理，給出了viterbi通道譯碼演算法dsp實現和發射端突發形成的模擬實現。
  16. It can be integrated into the internet, to enlarge the area of the das / ddc functions at the regional, national or world levels

    它可以納入因特網領域的資本擴張/變頻功能，在區域、全國或世界水平
  17. From resource - usage point, this design is better than traditional ddc

    在資源消耗上本設計也遠小於傳統的數字下變頻器。
  18. Also by return e - mail, we will appreciate sending us your proforma invoice cif new york included all charges ( ddc, baf, etc ), and your sales contract, for our first trial order for the following models, for our study and confirmation

    您若能通過郵件的方式發給我們關于紐約到岸價的銷貨清單（其中包含有的費用如ddc ， baf等，以及您的銷售合同以供我們首次訂單，之後的模塊產品研究及確認所需，我們仍將不勝感激
  19. At the same time, as the chief agent of yamatake corporation of japan in the north and east of china, we provide all yamatake ' s ba products, including bms, ddc, sensors, control valves, butterfly valves, actuators and etc

    同時我公司為日本山武公司華北區的系統首席代理商，向用戶提供山武公司全套樓宇自控產品，包括系統控制軟體、 ddc控制器、傳感器、電動調節閥、蝶閥及風閥執行器等。
  20. Secondly, basing on single channel if sr receiver mathematic model, this thesis has designed if sr receiver subsystem and brought forward its design project and system circuit principle diagram, and explained the system working principle. furthermore, this thesis introduces the working principles and respective applications of wideband high - speed adc ad6640, ddc ad6620 and high - speed dsp tms320c6713 according with the if sr receiver subsystem high - speed analog digital conversion department, digital down conversion department and high speed digital signal processing department. thirdly, the thesis emphatically demonstrates the software realization department of the if sr receiver subsystem, which including ad6620 ' s inner parameter software setup, tms320c6713 data transmission and processing and the quadrant demodulation algorithm program realization

    其次，基於單通道中頻軟體無線電接收機數學模型，本文設計了中頻（ if ， intermediatefrequency ）軟體無線電接收機子系統，給出了中頻軟體無線電接收機子系統的設計方案和系統電路原理圖，說明了系統工作原理，並分別對應系統中的高速模數轉換部分、數字下變頻部分、基帶數字碩士學位論文軟體無線電理論研究及中頻軟體無線電接收機子系統設計信號處理部分，介紹了高速adcad664o ，數字下變頻器（ ddc ， digitaldownconverter ） ad6620 ，高速數字信號處理器（ dsp ， digitalsignalproeessor ） tms320c6713的工作原理，以及它們在中頻軟體無線電接收機子系統中的應用。
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