數字上變頻 的英文怎麼說

中文拼音 [shǔzìshàngbiànbīn]
數字上變頻 英文
digital uconvert
  • 數 : 數副詞（屢次） frequently; repeatedly
  • 字 : Ⅰ名詞1 （文字） character; word 2 （字音） pronunciation 3 （字體） form of a written or printed ...
  • 上 : 上名詞[語言學] （指上聲） falling-rising tone
  • 頻 : Ⅰ形容詞（次數多） frequent Ⅱ副詞（屢次） frequently; repeatedly Ⅲ名詞1 [物理學] （物體每秒鐘振動...
  • 數字 : 1. （表示數目的文字; 表示數目的符號） figure; digit; numeral; character; numeric character 2. （數量） quantity; amount
  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. 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。
  3. In this thesis, firstly, we put forward a new algorithm of the synchronization of carrier reference phase, that is to use the curve synthesizing with the general digital carrier phase looper to have an estimation on carrier frequency within 10 ms so as to meet the need of meteor burst communication. we have done some simulations to get the performance of carrier frequency estimation using two modulation modes ( 16qam and 4 - qpsk ), and had some test on the carrier phase looper in conditions when using different baud rate transmission and when the baud tuning have windage

    我們對兩種正交調制方式（ 16qam和4 - qpsk ）進行了模擬工作並給出了模擬結果，同時討論了碼元同步定時誤差對鎖相環路工作的影響並根據流星通信中使用變速率傳輸時鎖相環路的載波同步性能進行了測試；然後在基於軟體無線電思想的數字處理平臺（該數字處理平臺實現了中頻數字化）上用dsp軟體完成了載波的相位跟蹤。
  4. Based on the tms320f240 controller produced by ti company, the hardware and software designation of the symmetrical voltage space - vector pwm is presented. designed a digital controller with tms320f240 to modulate the speed of the motor, in which the keyboard and led display are bedded. it can be to set the frequency of motor and display the run frequency of motor in real time

    基於ti公司的tms320f240控制晶元，介紹了對稱空間電壓矢量硬體設計和軟體設計，採用tms320f240設計了一款用於電機變頻調速的數字控制器，該控制器上設計有鍵盤和led顯示，可以設定和動態顯示電機運行頻率。
  5. Abstract ： to obtain the high frequency ( hf ) array signals, an applied circuit called hf array signals generator is designed using dsp and duc ( digital up converter ). the generator simulates the generation of output signals of 9 - element arrays with different array format, different direction of arrival ( doa ) and existing cochannel signals respectively

    為了在實驗室中獲得短波天線陣列信號，應用dsp晶元和duc晶元（數字上變頻器）設計了一個實用電路短波陣列信號發生器，模擬實現了短波九元天線陣的多種陣型、不同來波方向及存在同頻多信號時的陣列輸出信號。
  6. 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。
  7. 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。
  8. This paper presents a method of realization of numeric transducer using tms320c542 dsp. the program of numeric down - transducer and multi - rate sampling is given

    摘要在tms320c542數字信號處理器上，用查表方法實現了dsp數字變頻器，並給出相關的數字下變頻和多抽樣率信號處理程序。
  9. 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。
  10. The transmitter adopt qam modulation mode, which is a directly modulation upper frequency conversion mode, which could afford more high bit rate transmission in the same bandwidth compared to other modulation mode

    發射機採用數字式調制方式，即qam直接調制上變頻方式，相對于其它調制方式可以實現在相同帶寬下的高碼率傳輸。
  11. 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。
  12. The basic characteristics, framework, principles of dominant parts and application of those are studied and illustrated. at the last chapter, by devising a short - wave radio station aforementioned fundamental theories are put into practice especially digital modulation, demodulation, ddc and dug etc. the implement framework and design method of sdr are discussed by data transmission of voice including dug modulation in transmit module and ddc demodulation in receive module. moreover, satisfied results are obtained by validation on the sb3410 platform in bluewave system

    針對論文設計中用到的兩個比較重要的器件hsp50214b下變頻器和hsp50215上變頻器，作了較為深入的研究並給出了詳細的描述，包括基本特徵、框架結構、各主要部分原理及在設計中的應用；在最後一章，通過設計一個短波無線電臺，將前面的基礎理論尤其是數字調制、解調及數字上、下變頻等應用於實踐中，通過實例討論話音數據傳輸的軟體無線電實現結構及設計方法，包括發射模塊中的上變頻調制和接收模塊中下變頻解調等，並在bluewave系統的sb3410平臺上運行驗證，取得了較為滿意的結果。
  13. It is very difficult to realize digital rf, but we can realize digital if. digital if mainly include : digital up convert ( duc ^ digital down convert ( ddc ), a / tk d / a and number control oscillator ( nco )

    目前實現射頻數字化還有一定的困難，但可以實現中頻部分數字化。數字中頻處理主要包括數字上變頻、數字下變頻、 a d與d a的處理以及數控振蕩器等。
  14. Computer network and information science, digital video surveillance system is becoming the first choice in modem society, in which real - time and first - hand digital monitoring is provides after video frames are captured by video cameras installed in various locations, and then transformed to digital images, which can be effectively archived on digital media after compression

    隨著數字視音頻壓縮技術、計算機網路和信息科學的迅猛發展，數字化的視頻監控系統成為時代的必然產物。數字視頻監控系統就是通過設置在不同位置的攝像頭採集數據，經過變換系統、視頻壓縮系統將數據匯集並處理，在監視器上顯示並管理，為管理人員提供實時及直觀的視覺資料。
  15. The digital upward frequency conversion is the key element of the waveform synthesis. at the same time, basic theoretical analysis and optimum design are done for pci bus slave interface, fifo, transmit signal processor, digital - to - analog converter and logic control

    本文對波形合成技術的核心? ?數字上變頻進行了深入細致的研究和介紹，同時對波形合成器中的pci總線介面、先進先出緩沖器、發射信號處理、數模轉換及邏輯控制等部分進行了分析和優化設計，給出了最佳設計方案。
  16. Secondly, we used the dsp assembly language to perform the carrier phase tracking based on a digital processing system. this system is designed according to the idea of software radio. this digital processing system realized the intermediate frequency digitalization. with the diverse configuration of the digital upconverter and digital downconverter in this system, it can carry through many signal modulation modes. and because the carrier phase trac king is performed using software in dsp, it brings great convenience to this system and makes this system available in many digital communication systems

    在該數字處理平臺上可通過加載不同的軟體對平臺中的數字上下變頻器進行靈活的配置以實現不同的數字調制解調制度，通過將載波的相位跟蹤工作放在dsp軟體中進行帶來了很大的靈活性，能夠適用於當前許多種數字通信系統。
  17. The radar digitalized receiver is based on digital down conversion ( ddc ) technology, which is implemented on fpga. the radar controller is based on the following technologies : fpga, tigersharc dsp and can bus. the implementation of ddc includes two parts, the demodulation and decimation of i and q channels

    雷達數字化接收機部分是基於數字下變頻（ ddc ）技術在fpga上實現的演算法研究及工程實現;雷達控制器部分是基於tigersharc 、 fpga 、 can總線的多項控制技術的方法研究及實現。
  18. Here we try out a hard way with video card to realize it. in the second place, we discuss some ways of digital modulation in transmission of image data, for example bpsk, qpsk, qam, and so on

    隨后，針對qpsk ，詳細討論了其基本原理和具體的實現演算法，並進行了模擬驗證，然後選用hsp50215數字上變頻晶元和hsp50214b數字下變頻晶元，設計了數字調制、解調器的實現方案。
  19. The transmitter is capable, when coupled with appropriate software, of digital modulation schemes such as pi - qpsk, gmsk and so forth, and supervised by a personal computer

    它主要由一片dsp與可編程數字上變頻器構成，可以通過pc機進行監控，通過加載合適的軟體實現各種調制方式如pi 4 - qpsk ， gmsk等。
  20. Digital down / up converter ( ddc / duc ), modulation and demodulation are discussed in the dissertation as some essencial parts of sdr platform

    本文以軟體無線電的理論為基礎，研究了軟體無線電中的部分關鍵技術：包括數字上下變頻的實際處理模型以及調制解調部分的實現。
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