synchronous digital network 中文意思是什麼

synchronous digital network 解釋
同步數字網
  • synchronous : adj. 同時的，同期的；【物理學】同步的。adv. -ly
  • 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。
  • network : n. 1. 網眼織物。2. （鐵路、河道等的）網狀系統，網狀組織，廣播網，電視網，廣播[電視]聯播公司。3. 【無線電】網路，電路。4. 【計算機】電腦網路，網。
  1. Bits supplies the synchronous timing signal to these equipments inside the telecommunicationt building, such as dps, atm, no. 7, dxc, tm & adm in sdh, don and in etc. the related techniques are involved in the content of synchronization ne twork, timing distribution, the timing signal transportations x impairments etc. the second chapter tells the structure and the function of the building integrated timing system. the third chapter summarizes the digital synchronization network techniques, which emphasizes the basic concept of synchronization networks analyzes the necessity of building the synchronization network and introduces all kinds of synchronization methods. the fourth chapter represents the transportation of the synchronization signal

    本文第二章講述了通信樓綜合定時系統的構成及作用：第三章概述了數字同步網技術，著重描述了同步網的基本概念，分析了建立同步網的必要性，講述了各種同步方法；第四章闡述了同步定時信號的傳輸；第五章介紹了bits設備所支持的同步狀態消息；第六章、第七章為本文的重點，通過對時鐘信號建立數學模型，從理論上分析時鐘內部噪聲和相位瞬變產生時鐘定時信號損傷的原理，企圖尋找到更好地控制頻率漂移的方法。
  2. Aim at the dtc ' s blemish mentioned above and the direction of dtc technique development, the dissertation put great emphasis on the work as follows, with an eye to exalt dtc system function : ( 1 ) a new speed - flux observer of an induction motor is proposed to enhance the accuracy of flux observing, which is an adaptive closed - loop flux observer and different from the traditions. a new adaptive speed - observation - way is deduced out according to the popov ' s stability theories ; ( 2 ) to improve the performance of dtc at low speed operation, we have to exalt the accuracy of the stator flux estimation and a new way of bp neural network based on extended pidbp algorithm is given to estimate and tune the stator resistance of an induction motor to increase the accuracy of the stator flux estimation ; ( 3 ) digital signal processor is adopted to realize digital control. an device of direct torque control system is designed for experiment using tms320lf2407 chip produced by ti company ; ( 4 ) bring up a distributed direct torque control system based on sercos bus, sercos stand for serial real time communication system agreement which is most in keeping with synchronous with moderate motor control ; ( 5 ) the basic design frame of the hardware and software of the whole control system is given here and some concrete problem in the experiments is described here in detail

    針對上面提到的直接轉矩控制的缺陷和未來直接轉矩控制技術發展方向，本論文重點做了以下幾個方面的工作，目的在於提高dtc系統的綜合性能： （ 1 ）提出一種新型的速度磁鏈觀測器，新型的速度磁鏈觀測器採用自適應閉環磁鏈觀測器代替傳統的積分器從而提高磁鏈觀測的精度，並且根據popov超穩定性理論推導出轉速的新型自適應收斂律； （ 2 ）改善系統的低速運行性能，主要從提高低速時對定子磁鏈的估計精度入手，提出了一種提高定子磁鏈觀測精度的新思路? ?利用基於bp網路增廣pidbp學習演算法來實時在線地修正定子電阻參數； （ 3 ）採用數字信號處理器dsp實現系統全數字化硬體控制，結合ti公司生產的tms320lf2407晶元，設計了直接轉矩控制系統的實驗裝置； （ 4 ）提出了基於sercos總線網路化分散式的直接轉矩控制系統， sercos （ serialrealtimecommunicationsystem ）是目前最適合同步和協調控制的串列實時通信協議； （ 5 ）基本勾勒出整個控制系統的硬體和軟體設計基本框架，詳細描述一些實驗中的具體的細節問題。
  3. The role and application prospects of synchronous clock system of digital network in guangdong power system are briefly described, and some proposals for its construction and planning are presented as well

    簡述了數字同步時鐘系統在廣東省電力系統的作用與應用前景，並對廣東省電力數字同步時鐘系統的建設與規劃提出了若干建議。
  4. By adopting qam ( quadrature amplitude modulation ) modulation, we have researched and implemented a high - speed data broadcasting system compatible with dvb ( digital video broadcasting ) standard in the past years, and integrated and applicated the system into sdh / hfc ( synchronous digital hierarchy / hybrid fiber coax ) network for the first time in china

    經過多年的研究，開發出了符合dvb標準、採用qam調制方式的陽光網高速數據廣播系統，同時在國內首次實現了基於sdh hfc網路的高速數據廣播系統集成應用。
  5. Measuring methods for the performances of switching equipment clocks in digital synchronous network

    數字同步網中交換設備時鐘性能的測試方法
  6. Sdn synchronous digital transmission network

    同步數字傳輸網路
  7. Sdh ( synchronous digital hierarchy ) has some primary advantages such as synchronous multiplexing, standard optical interface and strong network management compared with pdh ( plesiochronous digital hierarchy )

    同步數字體制（ sdh ）與傳統的偽同步數字體制（ pdh ）相比，有三大核心優勢，即同步復用、標準光介面和強大的網管能力。
  8. How to transmit high volume data effectively and economically on current sdh ( synchronous digital hierarchy ) transmission network is an important research area in transmission technology. this paper first introduces the background of eos

    如何利用現有的sdh （ synchronousdigitalhierarchy ）網路高效而經濟地傳輸數據業務，目前正成為傳輸技術中重要的研究課題。
  9. Digital simulations of synchronous machines in machine - network transient analysis

    機網暫態過程數值模擬中的同步電機模型
  10. Sdh. transmission and multiplexing - synchronous digital hierarchy - sdh information model for the network element view ; english version ets 300304 : 1997

    傳送和多路傳輸.同步數字層次結構
  11. The multicenter superwide view reappearance system which based on a technique of digital video composition is a complete set of innovative technological system from photographing and producing to output in partition and then to network synchronous playing and till a integral display. it applys many kinds of modem technique, such as photographing, digital video producing, multimedia, network and display, and on the commonly used platform it has realized a effect through software technique that only expensive and special equipment can achieve

    基於數字視頻合成技術的多通道超寬視景再現系統，是一種從拍攝製作到分割輸出再到網路同步播放直至一體化顯示的一整套創新的技術體系，它整合應用攝錄像技術、數字視頻製作技術、多媒體技術、網路技術、顯示技術等多種現代技術，在通用設備平臺上，利用軟體技術實現了昂貴特種設備才能實現的效果。
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