modulation demodulation 中文意思是什麼

modulation demodulation 解釋
調制解調
  • modulation : n 調整，調節；（聲調的）抑揚，變化；【音樂】轉調，變調；【無線電】調制。 amplitude modulation 振...
  • demodulation : n. 【無線電】解調，反調制；檢波。
  1. Amplitude modulation and demodulation circuit

    振幅復?調迴路
  2. Simulation for all - digital bpsk modulation and demodulation system

    調制解調系統的模擬
  3. In this paper, research on the algorithm of complete digital if and baseband transmission system and the realization of transmitter and receiver. / 4 - dqpsk is chosen as digital modulation scheme. the scheme of demodulation is baseband differential detection. sliding correlator can realize the symbol synchronous acquisition ; early - late gate synchronizer is used to do symbol synchronous tracking

    系統的發射機選定/ 4 - dqpsk為調制方式，接收機採用基帶差分解調的非相干解調方式，滑動相關器捕獲發送的pn序列，早遲門同步器跟蹤符號同步，使用相關器對同步后的符號進行最佳判決，並在這些演算法實現的基礎上，實現了直接序列擴頻和解擴技術。
  4. Furthermore, in order to supplement multi - object tt & c capability of new generation space tt & c system, gmsk modulation is recommended by ccsds because of its preferable frequency speciality and miscode performance. the thesis analyzed characteristic and demodulation realized of gmsk signal. attempting to design a universal multi - mode demodulator of bpsk, qpsk and gmsk, the thesis studied

    本文分析了gmsk信號的特點及解調實現，試圖設計一種bpsk 、 qpsk 、 gmsk通用的多模式解調器，因而研究了調制識別技術，分析了以決策論為基礎的三種信號的調制識別方法，並提出了基於人工神經網路的調制識別方法。
  5. Besides tt & c transponder, the power support for pico - satellite also covers cmos camera, data processing unit and energy subsystem, by connecting and charactization which, full course from modulation and demodulation of instruction data to feedback of image data, wireless long - range transmission and the feedback of sidetone signal could be achieved

    4 、整個衛星的電系統除了通信一體機外，還包括cmos相機和數據處理單元以及能源分系統。具備了這幾部分，對系統聯試，實現了從指令信號的調制解調和圖像信號的返回的全過程，並且可通過遠距離的無線傳輸。
  6. In order to combine the study of the ds - ss communication system ’ s availably jamming, the whole ds - ss communication system is modeled and simulated, including the modulation of the ds - ss signal, channel transmission, synchronal demodulation of signal and statistic of the bit error rate ( ber )

    為結合直擴通信系統的有效干擾研究工作，建立了直擴系統從信號的調制產生，通道傳輸、信號同步解擴解調和誤碼率統計的全過程模擬系統。
  7. Ich habe die modulation und demodulation des analogen und digitalen signal gelernt

    我學了模擬和數字信號的調制與解調。
  8. In the part of modulation and demodulation, we analyzed the principles of harmonic mixer, detectors, power dividers / combiners and branch - line couplers

    對調制/解調器射頻電路部分，包括亞諧波混頻器、檢波器、功率分配/合成器和分支線耦合器基本原理進行了分析。
  9. This paper mainly focuses on the noise limiting by means of the direct sequence spread spectrum ( dsss ) and the analysis of the transmission performance of the plc and some digital modulation technology. the contents of the paper is as follows : 1 ) the technical feasibility is proved after simulating noise limiting principle of dsss by means of systemview, the simulation software ; 2 ) a kind of band pass filter ( bpf ) is realized according to the requirement of filter and the principle of butterworth approximation, which satisfies the index of performance of dsss. 3 ) the low voltage plc system includes the sc1128, the specific modulation / demodulation ic, the bpf filter and other circuit components, furthermore, the control function of system is realized by means of the personal computer and the microcontroller

    本課題在對低壓電力線的傳輸特性和數字調制技術進行分析的基礎上，將通信理論中的直接序列擴頻技術（ dsss ）用於解決低壓電力線通信的干擾問題，主要研究內容如下： （ 1 ）用通信模擬軟體systemview對dsss技術的通信和抗干擾原理進行模擬分析，分別對時域和頻域下採用dsss技術前後接收信號的頻譜進行分析，驗證dsss技術在本系統中的可行性； （ 2 ）由dsss技術對濾波系統的要求，根據濾波理論分析了巴特沃思型濾波器的逼近原理並設計了合適的濾波電路； （ 3 ）用調制解調晶元sc1128和自行設計的濾波器加之輔助外圍電路，構造出低壓電力線載波通信系統，並採用atmel公司的單片機設計了接收和發射電路的微控制器； （ 4 ）分別對採取抗干擾措施前後輸入和輸出信號進行對比實驗，並對結果進行分析，驗證了dsss技術對干擾信號的抑制作用。
  10. However, the modulation - demodulation of ultraviolet and voice transmission are the key technologies

    然而，紫外光通信的調制解調技術以及語音傳輸是整個系統的關鍵難點。
  11. In the modulation / demodulation circuits, cpld is selected as platform of the digital logic part, which includes series - shunt / shunt - series transform, difference coding and sample verdict

    調制/解調電路中，串並/並串變換、差分編/解碼和抽樣判決等數字邏輯部分是以cpld作為開發平臺，論文給出了實現上述功能的vhdl程序及模擬、測試結果。
  12. Fiber - optic fabry - perot sensor is a kind of high precision interferometric fiber - optic sensor, so this kind of sensor has a bright future. this sensor can be classified into 3 kinds of sensors by their demodulation device. these are intensity modulation / demodulation fiber - optic fabry - perot sensor, phase modulation / demodulation fiber - optic fabry - perot sensor and white - light interferometer modulation / demodulation fiber - optic fabry - perot sensor

    按照信號解調裝置的不同該種傳感器可分為三類：強度調制解調型、相位調制解調型和白光干涉儀調制解調型光纖fp傳感器，其中后兩種採用寬光譜光源，是白光干涉型光纖fp傳感器。
  13. At last, we introduced the design of demodulation device of white - light interferometer modulation / demodulation fiber - optic fabry - perot sensor. we provide the ways to improve the property of sensor. we performed a experiment to test the capability of our sensor to strain gauge, and applied our sensor into study on carbon fiber material temperature property

    最後討論了白光干涉型光纖fp傳感器信號解調裝置的設計，提出了改進該種傳感器性能的方法，並對該傳感器系統與電阻應變片作了對比實驗，將該種傳感器用於了碳纖維材料的溫度性能實驗中。
  14. First, it introduces the corresponding knowledge, technical roadmap of trunking system, and digital trunking system signaling. second, it presents the encoding, decoding, modulation, demodulation parts and several signaling functions of mdc1200 signaling system. in addition, it analyzes some signaling data packet formats

    本文首先對集群通信的相關知識、發展趨勢以及集群通信數字信令進行了介紹，接著對mdc1200信令的編碼、解碼過程，調制、解調方式以及各種信令功能的信令數據格式進行了詳細地分析。
  15. 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。
  16. The asic ( application specific integrated circuit ) is placed in core. it implements modulation / demodulation and docsis ( data - over - cable service interface specification ) protocol

    本文作者參與了重慶市的重點科研項目? cablemodem及其前端系統cmts的研製工作，主要從事的是cm的研究，可以說對cm相當熟悉。
  17. 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。
  18. This thesis begins with hfc network theory and docsis, analyses modulation / demodulation process of data communication in hfc. then, several theories are analysed including qam ( quadrature amplitude modulation ), nyquist root square filter, fec ( forward error correction ), map ( bandwidth allocation map ). and digital signal transmission involved the other important international standard ? itu - t j. 83 annex a / b, is discussed

    本文從hfc網路理論和docsis協議入手，分析了hfc數據通信的調制解調過程，對qam調制、奈奎斯特均方根濾波器、前向糾錯（ forwarderrorcorrection ，簡稱fec ） 、 map通信等進行了闡述；還從中探討了電纜數據機需要用到的另一個國際標準ituj . 83annexa / b所設計的mpeg信號的數字傳輸。
  19. ( 2 ) a new digital frequency - hopping communication system based on cipher - quasi - chaotic sequence is proposed, which combines the cryptography and frequency - hopping technology. the system ' s protocol, base - band signal processing and modulation / demodulation algorithms of the radio - frequency part are designed, and the hardware experiment conducted on a prototype of the system show that the system functions well. the finite precision problem arising while taking use of chaotic signal to generate pseudo - random sequence is studied and the anti - tracking capability of the cipher - quasi - chaotic sequence is studied with the volterra - tls method proposed in this dissertation

    （ 2提出一種新的基於密碼準混飩序列的密碼與跳頻技術相結合的跳頻通信系統，並且進行了協議部分、拂信號處聊分、射頻調制解調演算法部分的模擬研究和系統的硬體實驗研究；研究了利用混飩信號產生偽隨機序列的有限精度實現問題，利用本文提出的m業肚m 113方法對密碼準混飩序列產生的跳頻碼的抗鵬干擾能力進行了模擬實驗研究。
  20. In the field of traditional power line carrier ( plc ) communications, the modulation - demodulation cells of plc were implemented in means of analog method. the traditional plc systems can ’ t catch up with the market demands for higher communication quality

    在傳統的電力線載波通信領域，電力線載波機的調制解調單元都是用模擬器件實現的，這種傳統的載波機已不能完全滿足現有市場對通信質量的要求。
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