正弦變換 的英文怎麼說

中文拼音 [zhēngxiánbiànhuàn]
正弦變換 英文
sine transform
  • : 正名詞(正月) the first month of the lunar year; the first moon
  • : 動詞1. (給人東西同時從他那裡取得別的東西) exchange; barter; trade 2. (變換; 更換) change 3. (兌換) exchange; cash
  1. Dst for discrete sine transform

    離散正弦變換
  2. Abstract : bridge function and generalized bridge function are all three - valued function, and are made by initial sequence according as copied or shifted ways. they include some familiar orthogonal function of non - sine, such as walsh function. this paper briefly introduced some research advance on this subject, emphasized to introduce the copy theory and generalized copy method. the process of making ( generalized ) bridge function, its property and application, were introduced briefly

    文摘:橋函數和廣義橋函數均為三值函數系,都是將初始序列經復制方式和移位方式后而形成的.它們包括了一些常見的非交函數,如沃爾什函數和方波函數等.簡要介紹了近10年來北京航空航天大學通信與電子系統博士點在非交函數方面研究的一些新進展,重點介紹了復制理論和廣義復制方法,橋函數、廣義橋函數的復制生成方法、性質及其應用等專題
  3. Pulsar signals should be nearly sinusoidal after the doppler shifts are taken out, so fourier transforms pick them up pretty easily

    當多普勒偏移去除后,脈沖星的信號應當近乎是曲線的樣子,所以傅里葉可以很容易的去除多普勒效應。
  4. The data analysis has to compensate for the doppler shift to make any signal as sinusoidal as possible, which helps pull it out of the noise ( with something based on a fourier transform )

    數據分析中比較對多普勒偏移進行補償以使信號盡可能地接近曲線,以方便從噪音中提取真的信號(通過傅立葉) 。
  5. There are five parts are as follows : in part one, the concept of switching function is introduced first to establish the nonlinear mathematical model of the induction motor variable frequency speed adjustment system which is fed by a sine pulse width modulated ( spwm ) inverter and takes the effect of the main magnetic circuit saturation into consideration, then the low frequency oscillation of the system is simulated according to the model. next, from the view point of energy conversion of the inverter - induction system, a criterion for the low frequency oscillation is proposed to determine whether the system is in low frequency oscillation which is judged by whether the interval of the negative current component of the inverter input current is more than 1 / fc ( fc is the carrier wave frequency of the inverter ) or not

    首先引入開關函數概念,建立了脈寬調制( spwm )逆器供電異步電動機,考慮主磁路飽和時的頻調速系統整體數學模型,模擬系統的低頻振蕩;其次從逆器-異步電動機系統能量轉角度出發,提出通過檢測逆器輸入電流中負電流的間隔時間是否大於1 / f _ c ( f _ c為逆器載波頻率)來判定系統是否出現低頻振蕩;最後的實驗結果驗證了系統低頻振蕩建模和判據的實用性和確性。
  6. The main circuit is consisted of 18 thyristors circuit and protection circuit. with the help of control subsystem, it can get the output of low frequency voltage ( current ) with the shape of sine wave ; the core of the control subsystem is the cpu of 87c196kc, and the synchronization circuit, the pulse - widen circuit, and the power - enlarged circuit form the accessorial subsystem of the control system. it possesses all the functions of digital triggering, digital tuning, analog / digital conversion ; the input transfer can isolate the input and output ; and the circumfluence reactor can reduce the circumfluence

    主迴路採用由18個晶閘管組成的三相零式電路,並輔以晶閘管的保護電路,通過控制可以得到低頻波的電壓(電流)輸出;控制迴路主要以87c196kccpu為核心,其外圍電路包括同步電路,脈沖拓寬電路,功率放大驅動電路等,完成了數字觸發、數字調節、模數轉等功能;進線電源壓器具有壓和隔離作用;環流電抗器則實現了有效抑制主迴路瞬時脈動環流的功能。
  7. In the paper, the theory of electric parameter measurement and analysis is discussed and researched. and the electric parameter automatic measurement system based on singlechip computer embedded sytem is developed according to the requirement of electromagnetic compatibility. the result of the theory research is applied to the system successfully

    本論文是對非波條件下電氣參數測試理論和以傅立葉為核心的頻域分析理論進行深入的研究和探討,併兼顧電磁兼容性的要求,研製出基於單片機嵌入式系統的電氣參數自動測試系統,使上述研究成果得以成功的應用。
  8. Relationship between mdct and simultaneous mask effect curve

    離散餘與同時掩蔽效應曲線的關系
  9. The topologies family include single four - quadrant power switch mode, push - pull mode, half - bridge mode, and full - bridge mode circuits. taking full - bridge mode circuit as an example, the operational mode, steady principles, transient voltage feedback control strategy of the converter are investigated. the output characteristic curve, the design for the key circuit parameters and the reference sinusoidal circuit which is synchronous with the signal of n or 1 / n times line voltage frequency are given

    該電路拓撲族包括單四象限功率開關式、推挽式、半橋式、全橋式電路,以全橋式電路為例分析研究了這類器工作模式、穩態原理與電壓瞬時值反饋控制策略,給出了器的外特性曲線、關鍵電路參數、與電網電壓n倍頻或n分頻信號同步的基準電路的設計。
  10. Proper selection of control algorithms and capacitor voltages helps synthesize controllable and waveforms almost sinusoidal three - phases ac voltage with minimum low - order harmonics at both sides of the converter

    選擇適當的控制演算法和電容電壓,能在器的兩側合成低次諧波含量小且波形近似於的可控輸入/輸出電壓。
  11. This paper put forward a method of using amending sine value in the spwm sine table. this method can correct the distortion of the output voltage waveform, which resulted from the dead time used to the voltage type whole bridge main circuit. the inverter system adopts digital fuzzy controller with feed forward correction and which proportion coefficient and integral coefficient is changeable, so dynamic response is improved

    本文提出了一種採用修補spwm表值的方法,用以改善電壓型全橋逆主電路因上下橋的功率器件切時先關斷后導通的死區時間而引起的輸出電壓波形畸;逆系統採用帶前饋校比例積分系數的模糊控制器,提高了系統的動態響應指標;系統設計了完善的保護措施,並具有市電電網的故障診斷功能。
  12. This paper include the following parts. firstly the sine exciting - voltage is guaranteed by direct digital synthesize technology ; secondly the digital output of cos ( 9 ) and sin ( 9 ) are generated by microcontroller ; thirdly the two voltage signals which are the product of the two former signals gained by the multiplying d / a converter, being filtered and amplified, have constant frequency, and one amplitude has sine function relationship of with the input angle, and the other amplitude has cosine function relationship of with the input angle ; finally the two signals are acquired and analyzed by relative instrument and software

    主要由以下幾部分組成:用數字頻率合成技術( dds )產生激勵電壓信號u _ msin ( t ) ;用單片機產生幅度的數字量輸出sin ( )和cos ( ) ;用乘法型d a轉器實現激勵電壓和幅度的乘積,並通過濾波器和功放后即得到頻率固定,幅值隨輸入角成化的電壓信號;最後用數據採集卡採集輸出信號,顯示波形並進行頻譜分析。
  13. These topologies of inverters are composed of two bi - boost dc / dc converters, they are symmetry. so whole circuit turn into four - quadrant converters, we can control every power mosfet on or off. then we can get sine wave with direct current polarization at the left, at the same we also can get sine wave with direct current polarization phase contrast 180 compared of the left at the right

    這類逆器由左右二個雙向boostdc / dc器構成,左右二邊是對稱的,所以整個電路構成了一個四象限器,我們可以恰當控制各功率管的開、關,使左邊的兩象限dc / dc器輸出一個帶直流偏置的波,使右邊的兩象限dc / dc器輸出一個相差180度帶同樣直流偏置的波形,這樣,負載zl上的電壓是左、右兩個dc / dc器電壓的差動輸出,好可以消掉直流偏置,最終在負載r1上得到的就是波。
  14. 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

    小波分析優于傅里葉之處在於,小波分析在時域和頻域同時具有良好的局部化性質,因為小波函數是緊支集,而三角、餘的區間是無窮區間,所以小波可以對高頻成分採用逐漸精細的時域或空間域取代步長,從而可以聚焦到對象的任意細節。
  15. Fourier transform is a way of looking at a time series as a sum of sine waves at different frequencies

    傅里葉是一種把它看成不同頻率的波的級數和的方式。
  16. The hardware circuit design include : industrial control computer configuration, selection of industrial control board type, design of the power supply and monitoring interface circuit, design of signal processing interface circuit ( the constant current source circuit, the time base signal processing circuit, the processing circuit for the signal to be measured ), design of panel control circuit, design of the system self - checking circuit, and etc. the program flow hart include : main program flow chart, system boot - strap self - checking program flow chart, manual static testing program flow chart, semiautomatic static testing program flow chart, automatic static testing program flow chart, dynamic testing program flow chart, transient testing program flow chart, source voltage and current monitor program flow chart, investigate function testing program flow chart, and etc. the measure system offers six working power supplies, the signal of time base, the signal of constant current source, sine wave signal and step to leap signal, and measures the frequency of the output pulse signal of the wide range pulse convert circuit accurately under three kinds of different test state ( static form, dynamic form and transient form )

    硬體電路設計包括:工控機配置、工控板卡選型、產品電源及監控介面電路設計、信號處理介面電路(恆流源電路、時基信號處理電路、被測信號處理電路)設計、面板控制電路設計、系統自檢電路設計等。程序流程圖包括:主程序流程圖、系統開機自檢程序流程圖、手動靜態測試程序流程圖、半自動靜態測試程序流程圖、自動靜態測試程序流程圖、動態測試程序流程圖、暫態測試程序流程圖、電源電壓和電流監控程序流程圖、研究功能測試程序流程圖等。測試系統提供六路工作電源、時基信號、恆流源信號、波信號和階躍信號,並對三種不同測試狀態(靜態、動態、暫態)下大量程脈沖電路輸出脈沖信號的頻率進行精確測量。
  17. Discrete cosine transform ( dct ) is one of common transform encoding technique in common use of image compression. because such advantages as relatively matured theory, arithmetic and hardware ; ease to move relativity ; fit human vision system ; less calculation ( not include plural calculation ) : ease to realize and so on, dct compression is widely used

    離散餘( dct )是圖像壓縮中經常用到的編碼技術,由於理論、演算法和硬體相對成熟,去相關性好,適應人眼的視覺特性,計算量不大(沒有復數計算) ,易於實現等優點, dct壓縮編碼的應用非常廣泛。
  18. Currently, transforming coding is one of the most used approach for image coding, where the discrete cosine transform ( dct ), the discrete wavelet transform ( dwt ), and the lapped biorthogonal transform ( lbt ) are widely utilized. how to reduce the complexity of these discrete transforms, is the key technique to image compression. in this thesis, a type of lapped biorthogonal transform which can map integers to integers is considered

    編碼是圖像壓縮中的主流方法,其採用的主要有離散餘、離散小波、雙交疊式,如何減少這些離散的計算復雜性,一直是圖像壓縮研究的重要課題。
  19. Based on the computational structure of the proposed lapped transform, an efficient multiplierless algorithm for the lapped biorthogonal transform ( lbt ), called integer lapped biorthogonal transform ( intlbt ), is proposed

    利用提升原理,提出整數離散餘演算法,以該演算法為基礎設計了新雙交疊式的整數實現演算法,其計算只需要少量的移位和加法運算。
  20. Inverse sine transformation

    正弦變換
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