頻譜密度函數 的英文怎麼說

中文拼音 [bīnpǔmìdùhánshǔ]
頻譜密度函數 英文
spectral density function
  • 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...
  • 譜 : Ⅰ名詞[書面語]1 （按類別或系統編成的書或冊子等） table; chart; register 2 （指導練習的格式或圖形）...
  • 密 : Ⅰ名詞1 （秘密） secret 2 [紡織] （密度） density 3 （姓氏） a surname Ⅱ形容詞1 （距離近; 空隙小）...
  • 度 : 度動詞[書面語] （推測; 估計） surmise; estimate
  • 函 : 名詞1. [書面語] （匣; 封套） case; envelope 2. （信件） letter 3. （姓氏） a surname
  • 數 : 數副詞（屢次） frequently; repeatedly
  • 頻譜 : frequency spectrum; frequency content; spectrum; power density spectrum; power spectrum; [系統] s...
  • 函數 : [數學] function函數計算機 function computer; 函數計算器 function calculator; 函數運算 functional operation
  1. The signal process function of the software include these function : digital filter, windowing, auto - correlation function and cross - correlation function, mean and variance, probability density function and probability distribution function statistic ; auto - power spectrum, cross - power spectrum, frequency response function, coherence function, cepstrum analysis based on fft ( fast fourier transfer ) ; joint time - frequency analysis based on stft ( short - time fourier transfer )

    軟體的處理功能包括：數字濾波、時域加窗、自相關與互相關處理、均值和方差計算、概率密度和概率分佈函數計算；在快速傅立葉變換（ fft ）基礎上計算自功率譜、互功率譜、頻率響應函數、相干函數、倒頻譜分析；基於短時傅立葉變換（ stft ）的聯合時頻分析等。
  2. Based on the propagation law of the cross - spectral density function in the space - frequency domain, the properties of polychromatic vector gsm beams through a paraxial optical abcd system are studied. the analytical propagation expressions for the cross - spectral density matrix of vector gsm beams passing through a paraxial optical abcd system are derived, which permits us to study the propagation properties of vector gsm beams, including the propagation - induced polarization changes, effect of the spectrum bandwidth and irradiance distributions in a unique way. there are some applications of the theoretical results

    基於空間一頻率域中交叉譜密度函數的傳輸理論，研究了多色矢量gsm光束通過abcd光學系統傳輸時偏振特性的變化規律，首次推出了矢量高斯一謝爾模刑fgsm ）光束通過近軸abcd光學系統交叉譜密度矩陣的傳輸公式，並對矢量gsm光束傳輸中偏振的變化、譜寬的影響和強度的分佈等進行了統一研究。
  3. In the terms of interpolation, the image reconstructed from nearest interpolation or linear interpolation has good edge but serious noise ; reconstruction from 4 * 4cubic interpolation or three b - spline or three - order lagrange interpolations has better local character. 2 x 2cubic interpolations which has both better edge and local character is the ideal interpolation, the following is the basic principle during reconstruction : ( 1 ) the more width of interpolation, the more number of summation and the more order of interpolation polynomial, the higher of density resolution ; ( 2 ) the more of interpolation polynomial and width of interpolation, the more of reconstruction time simultaneously, aimed at eliminating the effects of noise contained in projection data, in this paper, author analysis cause and effects of common artifacts. importantly, discusses convolution back - projection reconstruction algorithm with a shift axis of rotation has been derived for correcting images that acquired with a divergence axis of rotation using the fan beam geometry with an angle - equaled detector

    在ct圖像重建時，選擇有限帶寬窗有較好的空間解析度，三角形窗有較好的密度解析度，選擇餘弦窗則使得空間解析度與密度解析度的折衷；從窗函數的頻譜角度來講，可以用於圖像重建的一個良好的卷積窗函數應該具備以下條件： （ ? ）小的3db帶寬b ，即最小的主瓣寬度； （ ? ）最小的旁瓣最大峰值a ； （ ? ）最大的旁瓣峰值衰減速度d ；就內插函數而言，臨近點內插與線性內插重建圖像噪聲大，但有較好的邊緣與細節； 4 4三次內插、三次b -樣條與四次拉格朗日多項式內插圖像平滑，局部特性較好。
  4. To solve it, the differential equation set is transformed by fourier transform and the dynamic differential equation in the form of matrix is educed. the calculation formulas of frequency response function of vehicle vibrating system, acceleration power spectrum density function are put forward

    用分析力學法建立整車動力學模型，推導出以矩陣形式表示的運動微分方程，並通過傅氏變換給出汽車動力學系統的頻率響應函數、加速度功率譜密度函數的計算公式。
  5. In the first session the fans vibration on - line monitoring system is realized with vc language, also compile auto power spectrum density function, cross power spectrum density function, autocorrelation function and cross correlation function etc spectral analysis function to carry through simple offline fault diagnosis

    首先用穩定性強、擴展性好的vc + +語言開發了通風機振動在線監測系統，並編寫了自功率譜密度函數、互功率譜密度函數、自相關函數和互相關函數等頻譜分析函數來進行簡單的離線故障診斷。
  6. The various functions inside the virtual spectrum analyzer introduced in the paper is time domain wave analysis, fft transfer, ifft transfer, cross analysis, and so on, which are all described in function controls. finally, this paper introduce the assemble of intelligent controls - oriented virtual instrument. and use classical signals and industrial practices to demostrate the accurate of virtual spectrum analyzer

    本文介紹的智能控制項化頻譜分析儀所具備的功能，有信號的時域分析、 fft變換以及ifft反變換、信號的微積分運算、信號的頻譜分析、信號自功率譜密度函數計算、信號互功率譜密度函數計算、頻率響應函數計算和相干函數計算，都是集成在功能控制項裏面的。
  7. Frequency code is not uniformity distribution and keeps to a probability distribution function defined by the spectral characteristics of the target of interest. the phase code is equally duality pseudo - random sequence and used to reduced the sidelobes of the signal correlation function. and the mismatch - phase sequence is corresponding with the frequency sequence one by one

    而頻率編碼為不均勻分佈，由所觀測目標的頻譜信息提取出概率密度函數決定頻率編碼序列的分佈；相位編碼為二元的偽隨機序列，採取均勻的二相編碼，消減同頻脈沖帶來的過高的相關函數的旁瓣；而失配相位為與頻率編碼相一一對應于各子脈沖中。
  8. The work of this dissertation is focused on research of some key technics in signal design and processing of mcpc signal. the main content of the dissertation is summarized as follows : it gives a detailed description of the form of the mcpc waveform and its mathematical model, and analyses the formation and properties of phase coded sequence. it discusses the effect of signal parameters on autocorrelation, power spectra and ambiguity function in forms of single pulse and pulse train and compares different kinds of single pulse signals and pulse train signals

    本文圍繞著多載波相位編碼信號在信號設計與信號處理的若干關鍵問題進行了研究，主要做了以下工作:描述了多載波相位編碼信號（ multicarrierphasecoded ，簡稱mcpc ）的信號形式，給出了其數學模型，對其中相位編碼序列的構成方式與特性進行了分析;從單脈沖和脈沖串兩種信號形式入手，對多載頻相位編碼信號的參數在自相關函數、功率譜密度和模糊方程上的影響作了詳細地討論，對不同調制方式的單脈沖和脈沖串信號進行了比較。
  9. First, the methods and procedures of general three orders nonlinear identification are summarized and the results are frequency functions described by basic and high order spectral density functions and frequency response functions

    首先，系統總結了使用一般三階非線性模型辨識的方法和步驟。得到的結果是用基本的和高階的譜密度函數以及基本的和高階的頻率響應函數表示的頻率函數。
  10. The basic concepts of second - order coherence theory in describing wavefields are introduced. these concepts are the cross - spectral density function and spectral degree of coherence in the space - frequency domain, and the mutual coherence function and the complex degree of coherence in the space - time domain

    介紹了二階相關理論中描述光場相干性質的基本概念，包括空間-時間域中的互相關函數、復相干度和空間-頻率域中的交叉譜密度函數、光譜相干度。
  11. The estimation of the phase difference of two vibration signals of the same frequency by cross - spectral density

    用互譜密度函數估算兩同頻振動信號的相位差
  12. The accurately controlled signal source generates sinusoidal elastic wave accurately controlled in frequency and stable in phase to " illustrate " underground media. time signal stacker receive signal by stacking and doing fft to measure the transfer function of media. " sompi " cepstrum method retrieve group velocity travel times and decayed factors of wave element from observational data of transfer function in a limited frequency window

    精密可控震源用於產生頻率精確相位穩定的正弦彈性波以照射地層內部，信號疊加器通過對接收信號進行疊加和進行傅立葉變換的方式實現對介質傳遞函數的精密測量， 「存否」倒譜方法能夠根據一段窄帶頻域傳遞函數數據獲得時域上各個波成分的群速度傳播時間和介質衰減因子。
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