頻帶譜 的英文怎麼說

中文拼音 [bīndàipǔ]
頻帶譜 英文
band spectrum
  • 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）...
  1. Due to existing signal processing technology ’ s shortage such aslow measurement, narrow measurement range precision and other poor performance, we introduced a high - precise signal processing technology : firstly, to get power spectrum with hanning windowed welch modified periodogram, search its peak value frequency ; secondly, to apply zooming analysis via goertzel algorithm ; at last, to get a highly precise doppler frequency with energy centrobaric rectifying algorithm 。 the simulating result indicated that this technology introduced could get accurate doppler frequency 。 depending on above discussed technology, we designed a signal processing scheme, and developed a signal processing system. the running result showed high performance, verified the feasibility and reliability of the highly precise signal processing technology introduced. in a word, the technology improved ldv ’ s performance such as measurement precision, measurement range, dynamic response time 。 and it will have a wide application foreground

    針對存在的缺點，本文提出了一種應用於激光多普勒測速的高精度信號處理技術，即首先利用加hanning窗的welch修正周期圖演算法得到信號功率譜，搜索其譜峰值頻率，接著利用goertzel頻譜細化演算法對搜索的譜峰進行細化分析，再引入能量重心頻譜校正演算法對細化后的譜峰進行校正分析，從而將離散頻譜分析演算法、頻譜細化演算法和頻譜校正演算法三者有機結合起來，充分發揮各自的優點:通過加hanning窗的welch修正周期圖演算法快速得到功率譜及峰值頻率，通過goertzel演算法獲得分析頻帶的高解析度頻譜，然後通過能量重心校正演算法對細化后的頻譜進行高精度校正，這樣不僅保證了演算法的高效性，而且大大提高了分析的精度。
  2. Electromagnetic compatibility and radio spectrum matters - electromagnetic compatibility standard for radio equipment and services - part 12 : specific conditions for very small aperture terminal, satellite interactive earth stations operated in the frequency ranges between 4 ghz and 30 ghz in the fixed satellite service v1. 2. 1

    電磁兼容性和無線電頻譜情況.無線電設備和服務的電磁兼容性標準.第12部分:固定衛星服務中工作在4 ghz到30 ghz頻帶的衛星地面站微小孔徑端的具體條件
  3. In light of the limitation of fast fourier transform ( fft ) for the method of traditional spectrum analysis to analyze the unsteady signal, wavelet and wavelet analysis are made for the typical unsteady process signal of starting up and shut down with the good characteristic of simultaneous localization in both the time and the frequency domains based on the field test on the vibration of two - row placed units in lijiaxia hydropower station, in which the signal is decomposed into different frequency band, and then the weak signal is caught and the dominant frequency is picked up for the analysis of the vibration source

    摘要基於李家峽水電站雙排機組振動的現場試驗研究，並且針對傳統頻譜分析方法傅立葉變換（ fft ）對于非平穩信號已力不從心這一缺陷，利用小波分析方法在時域和頻域上同時具有良好的局部化性質，通過對開停機這一典型非平穩過程信號進行小波及小波包分析，將其分解到不同頻帶內，獲取微弱信息和提取優勢頻率，並對其作振源分析，得出開停機初始時刻因水流不穩均出現強烈的振動現象，且低頻段信號能量最大，開停機過程水流脈動壓力和尾水渦帶擺動是引起定子基礎振動的主要原因。
  4. Electromagnetic compatibility and radio spectrum matters - meteorological aids met aids - radiosondes to be used in the 400, 15 mhz to 406 mhz frequency range with power levels ranging up to 200 mw - part 2 : harmonized en covering essential requirements under article 3. 2 of the r tte directive v1. 1. 1

    電磁兼容性和無線電頻譜情況.氣象輔助裝置.用於功率電平200 mw及以下的400 . 15 mhz到406 mhz頻帶的無線電高空測候器.第2部分:包括r tte指令3 . 2條款基本要求的協調的en
  5. Female courtship signal of the brown planthopper was made of many continuous regular pulses and male ' s signal was made of similar syllabics and had two types with different time domain characteristics. second male vibrational signal differed from male courtship signal with wide spectrum range and regular syllabics frequency. time domain characteristics of signals in different individuals even the same individual were different

    頻域特徵分析知，褐飛虱雌蟲求偶嗚聲信號的頻域特性較穩定，個體內比個體間差異小；雄蟲求偶嗚聲信號s 、 e片段頻譜范圍較寬，但主振頻率比較接近，差異不顯著； m片段頻帶較窄，主振頻率mvf略小於s 、 e片段，變異較小； m片段脈沖重復頻率prf為幻
  6. These include the well - known am, fm, shortwave and citizens bands and vhf and uhf television channels, as well as hundreds of less familiar bands that serve cellular and cordless telephones, gps trackers, air traffic control radars, security alarms, radio - controlled toys and the like [ see box on page 71 ]

    這些頻率包括眾所周知的am 、 fm 、短波、民用頻帶， vhf和uhf電視頻道，以及數百個較不為人知的頻帶，供行動電話、家用無線電話、 gps追蹤系統、航空管制雷達、安全警示與無線電遙控玩具等使用（見85頁無線電頻譜） 。
  7. But the bandwidth of the raw radar video is too wide to transmit directly in the common communication channel

    但是雷達原始視頻信號頻譜很寬，要求傳輸設備有很寬的通頻帶，而且效率低、投資大。
  8. Telecommunications - electromagnetic compatibility and radio spectrum matters - radiotelephone transmitters and receivers for the maritime mobile service operating in vhf bands - part 1 : technical characteristics and methods of measurement v1. 3. 1

    電信.電磁兼容性和無線電頻譜情況.工作在甚高頻帶的海上移動業務用無線電話傳送機和接收機.第1部分:技術特性和測量方法
  9. Wavelet analysis is used to translate noise signal of the engine into time - frequency domain. selecting appropriate frequency band to pick up and making its envelope spectrum, then two feature frequency - 0. 5x speed frequency and 2x speed frequency that represent the abrasion condition can be found. in addition, a new diagnosis method of image processing technique is proposed

    利用小波分析將測得的機體噪聲信號變換到時頻域，選擇合適的頻帶加以提取並進行包絡譜分析提取包含特徵頻率的包絡，通過分析提取后的0 . 5倍頻和2倍頻分量，發現兩個特徵頻率可準確反映主軸承的磨損狀況。
  10. Doing the further research on the division frequency stack on the foundation of study of predecessor, at first the residual moveout correction is done to the seismic record, make the phase axle regularity, doing foundation for the same phase stack ; then carried on division scale processing by wavelet transform ; spectrum whitening is done to each scale, the high and low frequency band need to do prolongs, the middle frequency bands only increase the value of the frequency spectrum ; several kinds of methods that estimate the value of signal - noise ratio has been studied further, and summarize their advantage and disadvantage as well as the scope of application ; the seismic record after spectrum whitening is stacked by weighting with the value of the signal - noise ratio ; then estimate the value of signal - noise ratio which is each scale section after stacking, the scale that the signal - noise ratio is big is assigned big weighting, otherwise, the scale that signal - noise ratio value is small is assigned small weight ing, and carried on weighted reconstruct to each scale section

    本文在前人研究的基礎上，在分頻疊加方面做了進一步的研究。首先對地震記錄進行剩餘時差校正，校齊同相軸，為同相疊加做好基礎工作；然後對地震記錄用小波變換的方法進行分尺度處理；對各個尺度分別做譜白化，對于高、低頻段需要做頻帶延拓，中間頻段僅提升頻譜值；對于幾種信噪比定量估計的方法進行了深入的研究，並且總結了它們的優缺點以及適用范圍；對譜白化后的地震記錄用信噪比估計值作為加權系數進行加權疊加；對于各尺度的疊加剖面也進行信噪比估計，對于信噪比大的尺度給予大的加權系數，反之，信噪比值小的尺度給予小的加權系數，對各尺度疊加剖面進行加權重構。
  11. 754 horizontal - component digital broad - band records in western north america are processed. the acceleration response spectra are calculated and used as part of the database. the response spectrum values are estimated by the earthquake magnitude definition and are used as another part of the database

    將美國西部地區作為參考地區，對美國南加州地區的數字寬頻帶記錄進行了搜集與處理後作為觀測資料，共754條水平向記錄，與利用震級定義所估計的反應譜值一起，用統計回歸的方法建立美國西部長周期加速度反應譜衰減關系。
  12. Electromagnetic compatibility and radio spectrum matters - maritime mobile earth stations operating in the 1, 5 ghz and 1, 6 ghz bands providing voice and direct printing for the global maritime distress and safety system - technical characteristics and methods of measurement v1. 1. 1

    電磁兼容性和無線電頻譜情況.全球海上遇險呼救與安全系統用提供聲音和直接列印的工作頻帶為1 . 5ghz和1 . 6ghz的海上移動地面站.技術特性和測量方法
  13. The frequency analysis results show conclusions as follows : 1. the relative valid spectral power is declined with the volume percentage of inclusions in terms of exponent curve and the tendency of negative direction is same to that of forward direction

    當ly12鋁合金細小夾雜物（小於0 . 16mm ）的體積百分數從0 0 . 35時，在35 50mhz的頻帶范圍內，超聲波形的有效譜功率按近似指數曲線快速下降，沿相反方向檢測時其變換趨勢相同。
  14. From the velocity - type records and the acceleration - type records in one station the same ground motions can be recovered, and the calculated response spectra are the same in a specific period range. this indirectly proves the reliability of the two types of records

    速度型和加速度型數字寬頻帶記錄可以恢復出相同的地震動，在一定的川朋范田內得到相同的反應譜，間接證明了這兩種地恁記錄的可靠性。
  15. Abstract : by using the pulse - sequence model ， the inverse problem of amplification of broad - spectral - bandwidth laser pulse has been studied ， i. e. ， to find the initial input temporal pulse profile ， spatial profile ， spectral distribution and fluence from the required output temporal ， spatial pulse profile ， spectral distribution and fluence as well as the given amplifier parameters

    文摘:採用脈沖分割模型，研究了寬頻帶激光脈沖放大的逆問題，即由所要求的輸出激光脈沖時間、空間波形、光譜分佈和能量密度，並給定放大器參數情況下，求輸入激光脈沖時間波形、空間、光譜分佈。
  16. The third phase of the hong kong 3g auction allocates specific frequency bands to the third phase bidders

    香港第三代服務頻譜競投的第三階段把具體的頻帶指配給第三階段中的競投人。
  17. A new method to extract line - spectrum series based on energy criterion and sub - band synthesis is presented in this paper, and verification is further investigated with simulated and measured data

    本文提出了一種基於能量判據和子頻帶綜合的線譜序列提取方法，並利用實測數據進行了比較分析。
  18. In this paper ， based on the method of spectral analysis and the theory of fracture mechanics, by using the broad - band digital data recorded by xi an telemetry seismic network, the stress drop and regional shear stress of moderate and small earthquakes in shanxi province are determined firstly

    利用西安數字地震遙測臺網記錄的寬頻帶數字地震資料，應用斷裂力學理論與譜分析方法，首次測定了陜西地區中小地震的應力降和區域剪切應力值。
  19. 4 different types ’ features were generated, namely ar model parameters, power spectral frequency band intensity, energy for wavelet packet decomposition, wavelet packet entropy. every type of features were extracted respectively using pca and ica method and classified using linear neural network, knn and bp network

    建立了ar模型參數、功率譜估計頻帶強度、小波包分解能量比率、小波包熵四種特徵，分別使用pca與ica進行特徵提取，採用線性神經網路、 k -緊鄰法、 bp神經網路四種分類器進行分類。
  20. An adapting modulation scheme which behave spectral energy centralized, frequency spectrum narrow become very important

    數據傳輸中，需要頻譜能量集中，頻帶較窄的調制方式，以及解決干擾問題。
分享友人
分享到 Line

分享到臉書