幾次取樣 的英文怎麼說

中文拼音 [yàng]
幾次取樣 英文
several sample
  • : 幾代詞1. (多少, 用於詢問數量和時間) how many 2. (表示不定的少數目) a few; several; some
  • : Ⅰ名詞1 (次序; 等第) order; sequence 2 [書面語] (出外遠行時停留的處所) stopping place on a jou...
  • : Ⅰ動詞1 (拿到身邊) take; get; fetch 2 (得到; 招致) aim at; seek 3 (採取; 選取) adopt; assume...
  • : Ⅰ名詞1. (形狀) appearance; shape 2. (樣品) sample; model; pattern Ⅱ量詞(表示事物的種類) kind; type
  1. First, how to conduct sample and quantification of continuous time signal which is prior condition of sdr is explored in detail, and the comparison and analysis of some sample modes are given in which band pass signal sampling theorem is most important. second, multi - sample rate signal processing which is an important basis of sdr is studied. emphasis are put on decimation and interpolation those are the most fundamental process and the realization of decimation and interpolation filter

    在基於中頻采的軟體無線電結構框架下,首先詳細探討了軟體無線電的前提條件,即如何對連續時間信號進行采量化,比較分析了種采的方式,其中最為重要的是帶通信號采定理;然後探討了軟體無線電的一個重要基礎,即多采率信號處理,重點討論其最基本的兩個過程抽和內插以及抽器和內插器的實現;接著介紹了結構簡單、適用於一級抽的cic濾波器和適用於做2倍抽的半帶濾波器;再論文在總結了傳統的調制解調基礎上,結合軟體無線電器件的特點,系統的探討並實現了基於正交思想的am 、 fm 、 ask 、 fsk 、 bpsk 、 qpsk的正交調制解調演算法。
  2. Levels of the five most recent samples taken from that beach. because most gazetted beaches are sampled three times per month or more, a beach grading score provides a good snapshot of beach water quality over the current month

    個別泳灘的等級是根據最近5本的大腸桿菌何平均值而評定,由於大部份憲報公布泳灘每月均會抽本三或以上,公眾只需參考泳灘的等級,便可大概了解該月的水質狀況。
  3. Sir james clark ross had obtained a sounding of over 2, 400 fathoms in 1839, but it was not until of deep soundings was obtained in the atlantic and the first samples were collected by dredging the bottom

    1839年,詹姆斯.克拉克.羅斯爵士曾測得海水深度超過2 , 400英尋;但直到1869年,皇家學會用英國「豪豬」號艦艇進行了巡航后,才在大西洋測得一個海水深度,同時能過挖掘海底,得了研究海底的首批品。
  4. In connection with the difference and distribution characteristic of the samples in sample space rs based on dga, a new self - adapted weight fuzzy omean clustering model of fault diagnosis of the power transformer based on the potential function is proposed. meanwhile, from the aspect of geometry characteristic of fc - divided in s dimension sample space, a method is proposed for the purpose of getting an effective adjacent radius, adaptive cluster number c and original cluster center of x sample set. for the diagnosis sample x, the property measure and diagnosis rule are proposed, which under the condition of potential density function that determine c number of optimal fuzzy cluster p1

    根據以變壓器dga數據為特徵量的本空間各本差異特性以及本在空間r ~ s的分佈特性,首提出了基於勢函數自適應加權的變壓器絕緣故障診斷的模糊c -均值聚類模型;同時,從s維本空間的f ~ c -劃分何特性出發,提出了一種求本集的類勢有效鄰域半徑和自適應求聚類數和聚類中心初值的方法;對一個待診斷本,設計了基於類勢密度函數意義下的屬性測度和診斷準則。
  5. Several key techniques of carving and milling machine cnc system are deeply studied they include : the transformation, data rebuild and interface design of huge volume nc program produced by cam ; the algorithm of cubic parametric spline pre _ interpolation and high speed real time interpolation in the cnc system, which. will gain a much higher surface precision and cutting speed ; methodology and algorithm of movement velocity acceleration control on a real time forecast _ and _ prejudge basis is designed. therefore, a smooth movement is insured. the shake and noise problem caused by non _ uniform pules for driving stepping or servo motor is solved by an improving algorithm to generate uniform pules

    同時,本文對基於統一的pc平臺的雕銑機數控系統中的項關鍵技術進行了深入的研究,包括: cam生成加工程序的傳送、接收、讀及其加工鏈表的生成和實時重構;對cam生成的離散數據進行三參數條插值和基於累加弦長的三參數條插補控制,保證加工工件表面的精度和光順性;設計具有「前瞻」功能的自動升降速控制方法,保證加工過程的平穩性;通過脈沖均勻化,有效地解決加工過程中因為脈沖不均勻而引起的震動問題。
  6. The following algorithms have been proposed and tested in the thesis : 1 frequency selective fading : combine the isomorphism between the input space and the output space and propose a new approach to blind equalization of the channel. compared with conventional methods, the new approach offers lower computational complexity, better performance, and more robust against the over - determination of the system order ; 2 time selective fading : a new approach to the equalization of time selective channel based on the zero - forced equalizer is proposed which is more simple in its structure of algorithm ; 3 time - varying channel : using the instantaneous mean value changes of the output signal to extract the information of channel variations and model it using ar model, kalman filter is then employed to track channel variations, it bears faster ability in tracking the variation of tv channels ; based on the isomorphism between the inputs and the outputs and some of the approaches using in mimo system, a new algorithm of equalization of simo time - varying channel is proposed, which also share the merits of being robust against the over - determination of the system order ; model the time - varying channel using the multi - resolution decomposition wavelets, and then a blind identification method based " on the model is proposed ; at last, a new model for equalization and identification of mimo system is proposed

    主要工作在以下個方面: 1 、針對頻率選擇性衰落通道:結合輸入輸出空間同構關系提出一種新的頻率選擇性通道均衡方法,與傳統方法相比,該方法計算量更小,收斂速度更快,性能更優,且對系統階的過確定表現穩健,具有實際均衡應用價值; 2 、針對時間選擇性衰落通道:提出一種基於迫零均衡的時間選擇性通道均衡方法,演算法結構簡單; 3 、針對時變色散通道:利用瞬態均值曲線提通道時變信息,對之ar建模,利用卡爾曼濾波器跟蹤時變通道抽頭變化,可以快速跟蹤通道變化;基於輸入輸出空間之間的同構關系以及多輸入多輸出系統的處理方法,提出了新的單輸入多輸出色散時變通道均衡與識別演算法,同具有對通道階過確定保持穩健的優點;結合小波多解析度分析提出一種基於小波模型的通道盲識別演算法;研究時變的多輸入多輸出系統的盲均衡與盲反卷積問題,給出一種時變系統處理模型。
  7. From theoretical analysis, we know the existing demodulation methods have limitations as following : one is that the subtraction of the two signals frequencies will display as the result of demodulation when we demodulate two time - domain adding signals without modulating information ( fault information ) ; the other one is that aliasing phenomenon will occur as a result of getting absolute value, detection or square in the process of generalized demodulation analysis, such phenomenon will result in some superfluous frequency composition on the frequency spectrum, which will puzzle the detec tion of mechanical vibration. if the sampling frequency is selected from a suitable range, the aliasing phenomenon will be avoided ; the last one is that aliasing frequencies will be produced in zoom demodulation analysis because this algorithm cannot employ digital low - pass filtering to avert the folding frequencies of higher harmonics in the process of zoom sub - sampling

    現有的解調分析方法存在以下三種局限性:將不包括調制信息(故障信息)的兩時域相加信號,也以其頻率之差作為解調信號而解出;廣義檢波濾波解調分析中,由於絕對值、檢波或平方過程可能產生混頻效應,在解調譜中表現為無法分析的頻率成分,並由此推導出避免這種混頻現象的采頻率的選范圍,從根本上避免此類誤診斷的產生;種細化解調分析新演算法中,因為無法在細化分析的選抽時進行數字低通濾波,有可能會出現調制頻率的高諧波成分發生頻率混疊而反折到低頻部分的現象。
  8. By studying the birds composition, quantity, species diversity and evenness, consumer biomass of community ; feeding niche, gathering and encountering probability of birds, we illustrate the characteristics of mountainous secondary forests wintering birds community in temperate zone in northeast china, and the changing trends and the relation with environments of birds community for 12 years fore - and - aft

    通過對群落內鳥類組成及數量、種的多性和均勻性及消費生物量、鳥類的食生態位,鳥類的集群及種間相遇率等方面的研究,基本闡明了溫帶環境中我國北方山地生闊葉林冬季鳥類群落結構的特點,以及12年前後其鳥類群落結構的變化趨勢、與環境變化的關系等。
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