時頻表示 的英文怎麼說

中文拼音 [shíbīnbiǎoshì]
時頻表示 英文
time frequency representation
  • 時 : shí］Ⅰ名1 （比較長的一段時間）time; times; days:當時at that time; in those days; 古時 ancient tim...
  • 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...
  • 表 : Ⅰ名詞1 （外面;外表） outside; surface; external 2 （中表親戚） the relationship between the child...
  • 示 : Ⅰ動詞（擺出或指出使人知道; 表明） show; indicate; signify; instruct; notify Ⅱ名詞1 [書面語] （給...
  • 表示 : show; express; mean; indicate; expression; presentation; signifying; remark; representation
  1. " the public can now make appointments at any time by using touch - tone dial telephones, " an immigration department spokesman said

    入境處發言人表示：市民現可隨時利用按掣音頻式電話進行預約。
  2. The signal we named it fundamental wave ; according to the fundamental wave, coefficients of the fundamental wave can be lined in a sequence. when the unique of the dissolve of the fundamental wave can be confirmed, the sequence of the coefficients can be regarded as one of representation forms of the signal itself ; theory of dissolvable signal shows that when order of the matrix of fundamental wave sampling equals to number of fundamental waves, the sequence of the sampling values from sampling points must be matched one by one with the sequence of the coefficients of fundamental waves. the sampling composed by sequences of the sampling values must be full sampling ; the relevant deductions of the theory of dissolvable signal shows that when sampling the signal, sampling frequency must be lager than the ratio of the number of fundamental waves to the occupation time of the fundamental waves ; to band - limited signals, when the fundamental wave is a sine signal, the results from the relevant deductions of theory of dissolvable signal is coherent to the classic sampling theory

    本文通過分析認為，當信號集中的任一信號可表示為一系列已知信號的線性代數和時，信號集便構成可分解信號集，已知信號稱為基波信號；對可分解信號而言，基波系數構成一序列，當對指定的基波信號集分解唯一確定時，系數序列本身便是信號的一個表示；可分解信號采樣定理指出當基波樣值矩陣的秩等於基波數時，則由采樣點處的采樣樣構成的樣值序列必與基波系數序列一一對應，從而由該樣值序列構成的采樣必為完全采樣；可分解信號采樣定理中的推論指出，對信號集進行采樣，采樣頻率必須大於其信號分解的基波數與其對應時長之比；對有限帶寬信號，若基波信號為正弦信號時，由可分解信號采樣定理推論給出的結論與經典采樣定理一致。
  3. Minus means that space - time circular frequency has a reverse direction to particle wave or the phasic difference between two circular frequencies is

    式中負號表示時空偏轉圓頻率方向與波粒子的波函數圓頻率
  4. During the video presentation, the audience was captivated by masters words, as some frequently nodded in agreement, others showed understanding smiles, and one black brother was moved to tears

    當講座進行時，錄影帶里師父的開示深深打動了在場的來賓，有人頷首表示贊同，有人頻頻露出會心的微笑，有位黑人來賓甚至感動得留下眼淚。
  5. Random process theory is a kind of effective mathematical tool to handle random vibration problem. through frequency spectra and time domain analysis for random course, the seemed complex vibration time - history can be transferred to trigonometric function series, thus makes it have certain periodic feature

    隨機過程是處理隨機振動問題的一種有效的數學工具，通過對隨機過程進行時域分析和頻譜分析，可以將看似非常復雜和毫無規律的隨機振動表示為三角函數的級數形式，從而使其具備了一定的周期性特徵。
  6. This d format can show the range of the data intuitively and express the real time data, which improves the speed and precision of svpwm arithmetic greatly. the ratio of carrier wave is increased and the blend of current is reduced, as a result the performance of the system is ameliorated. this thesis project has finished the debugging of the ac motor control system, and the result shows that hardware and software of the designed system is in reason

    在實現svpwm演算法的匯編程序中採用了一種新型的d定標法對標幺化的數值進行定標，這種d定標法能直觀的表示數值的大小范圍，可以實時的對數值進行定標，提高了svpwm演算法執行的精度和速度，增加了逆變器的載波比，減少了電流諧波，因而改善了交流變頻調速系統的性能。
  7. Adaptive time - frequency representation based on fractional fourier transform

    基於分數階傅立葉變換的自適應時頻表示
  8. The concept of otn node transmission model is introduced. the requirement of otn node transmission model is discussed. this model uses the frequency domain transmission matrix to express the otn node transport characteristics. the simplified model based on wdm and im - dd systems, the relationship between node characteristics and model parameters and measurement of model parameters are also discussed. at last a briefly discussion on how to develop the otn simulation and cad software based on our model is demonstrated

    在線性時不變的假設下，提出利用頻域傳輸矩陣來表示節點傳輸特性的方法給出了oxc和oadm兩類光傳送網節點的統一的表示根據目前通用的波分復用強度調制直接檢波系統的特點對復雜的頻域傳輸矩陣進行了簡化並對通常所關心的節點主要性能指標與模型參數的關系模型參數的測量和計算模型的設計與計算機模擬輔助設計軟體開發的銜接問題進行了討論。
  9. The developments of high - speed circuits and mmic pose the problem of analyzing the circuits characterized both in time and frequency domains. a variety of mixed time - frequency methods have been developed during the last quarter century in the research of the vlsi interconnect and package analysis and nonlinear steady - state analysis. this paper examines these methods from a unified point of view. various mixed problems are formulated as circuit equations in the mixed time - frequency domain. fundamental approaches to slove the equations are given, from which all of the published mixed methods can be naturally deduced. this facilitates the comprehension of these methods and is helpful for their applications. some new ideas are proposed based on the cross reference among these different kinds of methods

    隨著高速集成電路及mmic （微波單片集成電路）的發展，提出了對時-頻混合表示電路進行分析的任務.本文用統一的觀點考察了通常屬于高速電路互連與封裝分析、非線性電路穩態響應分析兩個不同方面的混合分析問題，指出這類問題的實質是要求解一個時-頻混合的電路方程，給出了求解這一方程的基本思路，闡明了現有的各種方法是如何從這一基本思路導出的.這可為認識這些方法的本質與聯系，促進它們的應用與發展提供參考.此文還探討了某些方法之間的相互借鑒，提出了若干新的想法
  10. It shows that when wave propagates along axis direction, the displacements of radial, axis direction and the change of electric field are coupling each other, and there is dispersing phenomenon, and the displacement of circle direction can figure out independently, it has not dispersing phenomenon

    發現當波沿著圓柱殼體軸向傳播時，物質的徑向運動軸向運動和電勢的變化相互耦合，伴有頻散現象但是扭轉運動可以獨立表示，並且同電場無關，無頻散現象。
  11. The lta rate is expressed as the ratio of reportable accidents to 1, 000, 000 man - hours ? the assumed number of hours worked by one person during a lifetime

    事故頻度率是指每百萬小時發生的傷害事故的頻率，它表示在當前的安全生產水平下，一個人在一生的工作時間中可能發生的事故次數。
  12. Lacking of space locality in time domain, fourier analysis can only make certain of the integral singularity of a function or signal. as a result, it is difficult to detect the spatial position and distribution of broken signal by fourier analysis. wavelet analysis has the characteristic of spatial locality, and its wideness in both windows of the time and the frequency can be adjusted, so it can analyze the details of a signal

    經典的fourier變換把信號按三角正、餘弦基展開，將任意函數表示為具有不同頻率的諧波函數的線性迭加，能較好地刻劃信號的頻率特性，但它在時空域上無任何分辨，不能作局部分析，這在理論和應用上都帶來了許多不便。
  13. To 2 indicates that the texture manager should load only mipmap levels 2 through 4 into local video memory at any given time

    設置為2 ，表示紋理管理器在任何給定時間應該只將2到4的mipmap級別加載到本地視頻內存。
  14. Firstly, in this paper, we review the histories of xml and xml database, and all kinds of data models used widely now. then we review traditional access control policies and policies specially used on xml, and present a new expression method of access set on xml based on child tree of w3c data model. and we bring rbac model into xml database and present a new xml access model x - rbac. because the usage of data in databases has high frequency, we present an ids model based on access set density to logging the potential security threats. and then we introduce the design and implementation of a prototype of our native xml database nhx and its access control system. finally, we draw a conclusion for this paper and the future work

    本文首先回顧了xml及xml數據庫的歷史，並總結了目前廣泛使用的xml數據模型，在分析了各種傳統數據庫訪問控制策略，以及xml的專有訪問控制策略的優缺點后，基於w3c的xml數據模型，提出了一種基於子樹的具有高彈性的便於實現的的訪問區域表示法，並將rbac模型引入進來，提出了一種適用於xml數據庫的訪問控制模型x - rbac ，同時為了區分xml數據庫訪問中的合法訪問和合理訪問，我們根據數據庫訪問具有頻繁性這一特徵，提出了一種基於區域訪問密度的入侵檢測模型（ ids ） ，以對隱藏在正常訪問中的潛在安全威脅進行報警和日誌。
  15. Finnish broadcasters at the same time are in talks with copyright organisations on future copyright fees, holding back programmes. french media group tdf ' s digita unit, which built and launched the network - which uses digital video broadcast handheld dvb - h technology - now offers network coverage for over 25 percent of the finnish population

    該服務網路是由法國媒體集團tdf旗下的數字服務部門負責建設並推向市場的，他們在其中使用了手持式數字視頻廣播技術dvb - h ，同時表示整個芬蘭人口的四分之一目前已經被此網路所覆蓋。
  16. Finnish broadcasters at the same time are in talks with copyright organisations on future copyright fees, holding back programmes. french media group tdf s digita unit, which built and launched the network - which uses digital video broadcast handheld dvb - h technology - now offers network coverage for over 25 percent of the finnish population

    該服務網路是由法國媒體集團tdf旗下的數字服務部門負責建設並推向市場的，他們在其中使用了手持式數字視頻廣播技術dvb - h ，同時表示整個芬蘭人口的四分之一目前已經被此網路所覆蓋。
  17. Scientists from universities in hawaii and florida say that they have taken videos of dolphins chasing schools of fish while emitting2 very low - frequency sounds

    夏威夷與佛羅里達高校的一些科學家表示，從他們已拍攝到海豚追捕魚群的錄像，並且發現海豚在捕食時發出較低頻率的聲音。
  18. The four - parameter basis functions decomposition of time - frequency signal representation is presented based on the characteristics of doppler frequency of the radar echoes, thereby dopplerlet transform is introduced

    根據接收到的雷達目標回波信號的多普勒頻率特性，提出用4參數基函數的時頻信號表示法，從而引出多普勒小波變換的概念。
  19. In term of this theory, we decompose some simulate signal and pipeline mfl signal by wavelet package transform. then select the best wavelet package base out of the decomposed coefficient and figure the brickwork of the best base on the relevant position in time - frequency plane showing the strong or weak of every coefficient. as a result, the time - frequency structure of signal analyzed is relatively visually represented ; that is to say, an anticipative result achieves

    按照這一理論，我們對一些模擬信號和管道漏磁信號作了小波包分解，然後從中選出最優小波包基，再把被選中的小波包基的相應砌塊表示在時?頻相平面上的相應位置上，並用灰度級別表示這個分量權重的強弱，結果較形象地把被分析信號的時?頻結構表現出來，達到了預期的目的。
  20. This paper presents a new method for designing robust h control system, in which the design objectives are converted into the inequality constraints and the selection of weighting functions in h controller design is expressed as a multi - objective optimization problem. the h controller, which satisfies given frequency - domain and time - domain performance indexes, can be found by using genetic algorithm ( ga ) to optimize the weighting functions

    本文提出了一種基於遺傳演算法的h控制系統設計方法，把控制系統的多個設計目標轉化成不等式約束，將h控制器設計中加權陣的選取表示成一個多目標優化問題，通過遺傳演算法優化加權陣參數，進而找到同時滿足給定的頻域和時域性能指標要求的h控制器。
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