phase modulator 中文意思是什麼

phase modulator 解釋
相位燈器
  • phase : n 1 形勢，局面，狀態；階級。2 方面，側面。3 【天文學】（月等的）變相，盈虧；【物、天】相，周相，...
  • modulator : n. 調整者，調節者；【無線電】調制者，調節器。
  1. The three - order modulator has a 2 - 1 cascaded structure and 1 - bit quantizer at the end of each stage, the modulator is implemented with fully differential switched - capacitor circuits. and then, the discussion will begin by exploring the design of various circuit blocks in the modulator in more detail, i. e., ota, switched - capacitor integrator, quantizer, two - phase non - overlapping clock signal, etc., at the same time, these circuits will be simulated in spectre and hspice. at last, the whole cascaded modulator will do behavioral level simulation by matlab soft and simulink toolbox

    本論文中，首先介紹模數轉換器的各種參數的意義，以及一階sigma - delta調制器和高階sigma - delta調制器的原理;給出解決高階單環sigma - delta調制器不穩定性的方案，引入級聯結構調制器，特別針對級聯結構調制器中的失配和開關電容積分器的非理想特性進行詳細的討論;本設計的sigma - delta調制器採用2 - 1級聯結構和一位量化器，調制器採用全差分開關電容電路實現;同時對整個調制器的各個模塊進行了電路設計，包括跨導放大器、開關電容積分器、量化器、兩相非交疊時鐘等，並利用hspice和spectre模擬工具對這些電路進行模擬測試;最後，利用matlab軟體和simulink工具對整個級聯調制器進行行為級模擬。
  2. Fpga and dvb standard are introduced firstly, dvb - c standard and composition of its system are analyzed completely, development of modulator structure and dvb - c digital modulator composition are presented, more over, analysis of respective modular are given. then, principle of dvb - c digital modulator system are presented, they are error control technique 、 mqam 、 nyquist rule and root raised cosine filter 、 window design method for fir filter 、 multi - rate signal processing ( integer interpolating, conversion of fractional sampling, equal conversion of net structure, polyphase structure for filter, poly - phase structure for interpolator, multi - stage implementation of samplying conversion ) 、 distrubited algorithm 、 cic filter 、 dds 、 cordic algorithm

    接著，專門利用一個章節闡述了dvb - c前端調制系統原理，他們了差錯控制技術、多進制調制（ mqam ） 、 nyquist準則與平方根升餘弦濾波器、有限沖擊響應濾波器的窗函數設計法、多抽樣率信號處理包括（整數倍內插原理、分數倍抽樣率轉換、網路結構的等效結構、濾波器的多相表示、內插器的多相表示、抽樣率轉換的多級實現） 、分散式演算法、 cic濾波器、直接數字頻率合成（ dds ） 、 cordic演算法。
  3. A cyclic radial shearing interferometer was used to diagnose the wavefront distortion of a laser system and an lcslm ( liquid crysnd spatial ligh modulator ) was used to control it. some results have been summarized as follows : l. according to the theory of scalar quanity diffeaction and the model of the random gaussian phase screen of low frequency wavefront, the effect of the low frequency wavefront with different rms gradient on the focal spot of a laser beam was studied

    本論文在激光光束波前畸變檢測和控制上進行了新的探索，主要就空間相位調制環路徑向剪切干涉儀以及它對波前畸變的檢測和液晶空間光調制器及其對中頻段波前畸變的控制進行了研究，其研究的內容和取得的成果如下：一、根據標量衍射理論，結合低頻波前畸變的高斯隨機位相分佈模型，研究了不同均方根梯度低頻畸變波前對激光光束焦斑聚焦性的影響，並採用描述中頻段波前畸變的功率譜密度概念，模擬計算了它對激光焦斑旁瓣的貢獻。
  4. 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。
  5. Because of the importance of the phase modulator in the detection procedure in resonator fiber gyro, this thesis analyses the band side frequency caused by the phase modulation, proposing the methods how to eliminate the band side frequency effect and how to make use of the band side frequency

    由於線性相位調制器在諧振式光纖陀螺的檢測過程中起到重要的作用，本文分析了由於相位調制器調制問題引入的邊帶頻率效應，提出了消除邊帶頻率和如何利用邊帶頻率的方法。
  6. Compared with other materials, polymers have many advantages such as low cost, easy fabrication, better fixation to the sensing polymer film, and the potential for integrating with a to or eo modulator for a fine tuning of phase

    與其它光波導材料相比，聚合物降低了材料及器件的制備成本；對聚合物敏感層具有相對更好的固定作用；有利於在傳感器上同時集成調制器（電光、熱光）進行相位微調。
  7. Because of the limitation of the measuring condition, in the thesis we had only measured some characteristics of the phase modulator : channel waveguides " loss coefficient is 0. 22db / cm, the split - ratio is 52 / 48 and half - wave voltage is < 5v

    由於條件所限，論文中僅測量了直波導損耗系數、相位調制器的半波電壓和輸出分束比。經測量，半波電壓小於5v ，直波導損耗系數為0 . 22db cm ，輸出分支比為52 48 。
  8. First, the principle of electro - optic modulator is introduced. the significance of some key technologies in the lithium niobate phase modulator are expounded, and the status quo of the device are summarized

    本文首先簡單介紹了電光調制器的原理，闡述了鈮酸鋰相位調制器中波導製作、 v型槽製作、器件封裝耦合及可靠性等幾項關鍵技術的研究意義，綜述了其研究、發展現狀。
  9. The device is based on a liquid crystal, display ( lcd ), to form a phase - most spatial light modulator

    此裝置採用了一個液晶顯示器（ lcd ） ，它形成偏相位空間光調制器。
  10. The design of the scheme is mainly in consideration of good adaptability for variable transmission systems. chapter 3 introduces the digital phase - locked - loop used in the modulator scheme

    方案設計的重點在於方案的靈活性，使之能夠對不同的傳輸體制具有盡量好的適應性和可移植性。
  11. Phase modulation system is a superior system, can transmit data at high rate. in this thesis, digital fh - mpsk and fh - / 4dqpsk modulator and demodulator are given according to the frequency - hop communication characteristics. at last, we implement these systems in both hardware and software platform

    本文根據跳頻傳輸的特點，對mpsk和4 - dqpsk這兩種相位調制方式進行分析，提出數字調制解調方案，並用matlab對其進行了模擬，最後還在ti公司的tms320c6416晶元上實現了這兩種系統。
  12. Design and experiment of acousto - optic waveguide phase modulator in electro - optic integrated acceleration seismic geophone

    光電集成加速度地震檢波器中聲光波導相位調制器的設計與實驗
  13. In addition, from the point of view of practicality, we make a study of experiment and application for double - exposure digital holographic interferometry, namely measuring gradn and grad / i of plane optical flat and measuring phase modulation characteristic of a kind of liquid crystal spatial light modulator ( lc - slm ) - liquid crystal television ( lctv )

    另外，本文還從實用的角度出發對二次曝光數字全息干涉術進行了實驗及應用的研究，具體就是平面平晶gradn和gradh的測量以及液晶空間光調制器（ lc - slm ）中液晶電視（ lctv ）的相位特性的測量。
  14. Utilizing phase modulator for realizing nrz - to - rz data format conversion with tunable duty ratio

    4標準的基於形狀自適應離散餘弦變換
  15. The forming mechanism of crosstalks in the tdm system was analyzed theoretically, and the relationship between crosstalks and the extinction ratio of optical pulse modulator used in the tdm system was investigated. the interchannel and intrachannel crosstalks in the wdm system were discussed separately, and the contributions to crosstalks were appraised from architecture ’ s alteration, the finite isolation between channels in multiplexers or demultiplexers, and nonlinear effects in the system. noises in the large - scale multiplexing system were studied theoretically, and all kinds of factors were considered that have relation to noises, phase resolution, and dynamic range of the system, such as multiplexing channel number, the length of the transmission fiber, using in - line erbium - dropped fiber amplifiers or not, and so on

    本文從理論上分析了光纖水聽器時分復用系統串擾的形成機理，分析了光脈沖調制器的消光比與系統串擾的關系;分別對光纖水聽器波分復用系統的異頻串擾和同頻串擾進行了理論分析，研究了光纖水聽器波分復用結構、波分復用器與解復用器隔離度等因素以及非線性效應對系統串擾的影響;對大規模光纖水聽器復用系統噪聲進行深入細致的理論分析，研究了系統噪聲、相位解析度、動態范圍與復用數目、傳輸光纖長度、中繼光纖放大器等諸多因素的關系。
  16. Lithium niobate phase modulator has been widely used in the fiber communication, fiber sensing and some other areas. in fabricating of the device, some key technologies including the waveguide, v - groove, coupling, packing and the reliability of the device are very important in improving the performance of the device

    鈮酸鋰相位調制器已經廣泛應用於光纖通信、光纖傳感等眾多領域，而在器件的生產過程中，波導製作、 v型槽製作、器件耦合封裝及可靠性等幾項關鍵技術對器件整體性能的提高至關重要。
  17. Five key devices are studied, which are millimeter wave low power amplifier, millimeter wave low noise figure amplifier, millimeter - wave 0 / phase modulator, 14 to 56ghz millimeter wave quadruples

    重點研究了五種毫米波關鍵部件，包括毫米波小功率放大器、毫米波低噪聲放大器、毫米波0 /調制器、毫米波單刀雙擲開關、 14 56ghz毫米波四倍頻器。
  18. Then we optimized the structure of electrodes. on the basis of the theoretical analysis and design, we brought forward a method of fabricating technique for our laboratory, and we finished the fabrication of proton - exchange linboa phase modulator

    在理論分析、設計的基礎上，提出了與實驗室水平相適應的質子交換器件製作方法，完成了質子交換linbo _ 3單y相位調制器的製作。
  19. The device is a synthetical applicating example of phase modulator, intensity modulator and directional coupler theory. the characters and fabricating process of linbo _ 3 optical waveguide, electrodes design principle, the influence of sio _ 2 dielectric buffer layer on the performance of the device and design principle of tapped power ( ratio ) are analyzed

    該器件是相位調制、強度調制和定向耦合器理論綜合應用的典型，文章從理論上分析了linbo _ 3光波導的特點、製作工藝、電極設計原理、 sio _ 2介質緩沖層對器件性能的影響和抽頭功率的設計原理等。
  20. This thesis describes a all fiber optic accelerometer based on t - g double beam interferometer, the whole system include a coherent source whose wavelength is 1310nm, a flexural optic fiber disk act as sensing unit, photodetector, piezoelectric ceramic act as a phase modulator and signal processing circuit. the all fiber optic accelerometer described in the paper has many desirable engineering features which include : broad frequency response ; high sensitivity to measurands ; antielectromagnetic interference and small size

    本課題研究的是一種基於泰曼-格林（ t - g ）雙光束干涉儀原理的光纖加速度計，系統主要包括：中心波長為1 . 31 m的ld相干光源、起傳感作用的光纖柔性盤、光探測器（ pin ） 、相位調制用的壓電陶瓷以及信號處理系統。
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