nyquist 中文意思是什麼
nyquist
解釋
奈奎斯特-
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。 -
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。 -
Discussion question : produce a plausible justification of nyquist ' s theorem based on the fourier analysis information given in the lecture
討論問題：請根據課文中給出的傅里葉分析知識證明尼奎斯特定理。 -
Topics covered include : properties and advantages of feedback systems, time - domain and frequency - domain performance measures, stability and degree of stability, root locus method, nyquist criterion, frequency - domain design, compensation techniques, application to a wide variety of physical systems, internal and external compensation of operational amplifiers, modelling and compensation of power coverter systems and phase lock loops
所涉及的主題包括：反饋系統的特性和優勢，時域和頻域性能度量，穩定和穩定度，根軌跡法，奈魁斯特準則，頻域設計，補償技術，種類繁多的物理系統應用，運算放大器的內部和外部補償，能量轉換系統的建模和補償，以及鎖相環。 -
This paper suggests that there is another better way to judge whether a system is stable or not - that is analyzing the amplification of loop circuit with the nyquist rule
由於激勵信號是復數形式的變化量，因此我們還可以採用奈奎斯特準則，利用奈奎斯特圖在復平面上的變化特點，對環路增益進行分析。 -
Non - nyquist sampling method research on extent modulate wave signal
幅度調制波信號的欠采樣方法研究 -
The bottleneck of hybrid filter banks adc system is that it cannot sample directly higher radio frequency signal because of lower analog input bandwidth of its adc. in order to remove it, a kind of downsampler model based on nyquist and bandpass sampling theorem is presented, analyzed and proved in time and frequency domain, in addition a downsampler is designed according to the model. on the basis of hybrid filter banks adc system, a class of high speed hybrid filter banks adc system is proposed
針對混合濾波器組adc系統因其adc模擬輸入帶寬低而不能對頻率較高的射頻模擬信號進行模/數轉換的瓶頸，作者提出了一種基於nyquist采樣定理和帶通采樣定理的抽取器數學模型，對該數學模型進行了時域、頻域的分析證明后，設計了一種基於該數學模型的sha抽取器，進而在混合濾波器組adc系統的基礎上，提出了高速混合濾波器組adc系統。 -
After that, it discusses the principle of the band - pass technology, illuminating the feasibility of the digital intermediate frequency system based on the sampling speed which is two times lager than the signal band but unsatisfying the nyquist theorem
隨后討論了帶通采樣技術的原理，說明可以使用不滿足奈奎斯特低通采樣定理但大於信號帶寬兩倍的采樣速率進行中頻數字化，減輕基帶處理負擔。 -
Under the condition of space moving changed system and the engineering practice, a function of the pixel dimension, the mtf of ccd sensor imaging, the width of target strip and the image motion has been acquired 4. under the condition of one pixel image motion and the nyquist frequencies, adopting the convolution method, the ratios of the mtf with image motion to the idea mtf are 0. 667
這樣就為在工程實際中，在空間移變條件下，求取了ccd探測器影像的mtf 、像元尺寸、影像分辨力和像移量四者之間的一個簡潔的函數關系:材了萬二1一（ 2 + n一m ） 2 ? o4n4 .採用模擬的方法和採用卷積方法的比較。 -
The proposed modulator uses 0. 35um standard cmos process, the nmos and pmos threshold voltage is 0. 54 volt and - 0. 48 volt, respectively, and the power supply is 1. 5 volt. the nyquist converter rate is 50 khz, oversampling ratio is 80. the proposed modulator can obtain 98db dynamic range, 16 bits converter resolution, and fits for high - fidelity, digital - audio application
本設計採用0 . 35微米標準cmos工藝，其中nmos和pmos晶體管的閾值電壓分別為0 . 54伏和- 0 . 48伏，電源電壓為1 . 5伏，奈奎斯特轉換率為50khz ，過采樣率為80 ，該調制器可實現動態范圍98db ， 16位的轉換精度，適合高保真數字音頻應用。 -
A solution is to use a low - pass filter to eliminate frequencies higher than the nyquist rate
解決辦法是用低通濾波器濾除高於奈奎斯特頻率的成分。 -
Comparing with conventional nyquist converters, - converters greatly release the requirements for high performance of analog circuit and precisely matched components. additionally, these converters exploit the enhanced speed, circuit density and low cost of modern vlsi technologies. currentlly, - adcs have been widely used for audio a / d conversion
- adc採用過采樣噪聲整形技術實現高精度模數轉換，和傳統的nyquist率模數轉換器相比，避免了對模擬電路性能指標和元器件匹配精度的較高要求，並可充分利用現代vlsi的高速、高集成度、低成本的優點，已成為音頻模數轉換的主要技術。 -
The time - dominance simulation of the two - stage converter and the integrated system experimental is performanced. the simulative and experimental results indicate that the theory analysis is ture. the system stability is achieved with designing the related parameters by nyquist criterion
最後通過時域模擬和聯調實驗，驗證了理論分析的正確性，實現了兩級變換器在全負載范圍變電壓輸出條件下的穩定工作。 -
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。 -
Based on the analysis of solving ambiguity, the thesis presents several algorithms for estimating doa and an algorithm for estimating frequency by using methods of subspace parameter estimation under sub - nyquist spatio - temporal sampling condition
論文在分析解模糊思想的基礎上，給出空時欠采樣下運用子空間類參數估計方法估計波達方向的幾種演算法和一種頻率估計演算法，並從性能上進行了比較和分析。 -
Topics covered include : frequency domain and state space techniques ; control law design using nyquist diagrams and bode plots ; state feedback, state estimation, and the design of dynamic control laws ; and elementary analysis of nonlinearities and their impact on control design
所涵蓋的項目有:頻域與狀態空間之技巧;用奈奎士圖與波德圖來設計控製法;狀態回授，狀態估測與動態控製法之設計;與非線性的基本分析和它在控制設計上的影響。 -
On the basis of the former research works, we present the detecting method as follows : for the narrow band characteristic of the track signal we use under - sampling instead of nyquist sampling to reduce the sampling rate. as to the carrier frequency, the spectrum of the 18 - information frequency - shift track signal has two peaks, then the carrier frequency is the average of the two peak frequency, to um - 71 jointless track signal, it has only one peak, then the carrier frequency is the peak frequency
針對移頻軌道信號的窄帶特性提出了使用欠采樣技術代替奈奎斯特采樣的方法，以降低信號的采樣頻率;國產18信息移頻軌道信號頻譜具有雙峰，雙峰頻率平均值就是信號的載頻頻率，而um - 71無絕緣軌道信號頻譜單峰，峰值頻率即為信號的載頻頻率。 -
The system can make the total signaling rate very close to the nyquist rate of given frequency band through the use of a lot of subchannels
該系統利用大量的子通道使得總的信號速率能夠非常接近給定頻帶的奈奎斯特速率。 -
Data quality control including sidelobe contamination, data ' s filling and smoothing, nyquist velocity of bistatic doppler radar, interpolation of velocities from a polar grid to a cartesian grid and problems found during simulating data and solusion to them
介紹了數據質量控制，包括旁瓣污染、資料的填補與平滑、雙基地最大不模糊速度、從極坐標到直角坐標的轉換以及在模擬風場過程中發現的問題和解決辦法。 -
By the eye diagram pattern, we have researched the ideal channel ' s respond - nyquist pulse, and have got its eye diagram model. based on this, a type of base - band codes called ijf codes have been derived
並由此導出一種沒有碼間干擾和定時抖動的基帶信號碼型，稱為ijf （ intersymbol - interferenceandjirterfree ）信碼。
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