行信號頻段 的英文怎麼說

中文拼音 [hángxìnháobīnduàn]
行信號頻段 英文
line band
  • 行 : 行Ⅰ名詞1 （行列） line; row 2 （排行） seniority among brothers and sisters:你行幾? 我行三。where...
  • 號 : 號Ⅰ名1 （名稱） name 2 （別號; 字） assumed name; alternative name3 （商店） business house 4 （...
  • 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...
  • 段 : Ⅰ量詞（部分） section; segment; part; paragraph; passage Ⅱ名詞（姓氏） a surname
  • 頻段 : frequency range; frequency channel
  1. After analysising three existed methods for phase difference correction on discrete spectrum, it is recommended to correct the spectrum containing small noise in engineer practice by the first phase difference correcting method ( performing fft analysis on two continuous original sequence ) with harming window

    綜合分析現有三種離散頻譜相位差校正方法，推薦在小噪聲工程實際中加hanning窗的第一種相位差法（采連續兩段信號作相同點數fft的相位差校正法）進行校正。
  2. 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。
  3. For digital audio encoding and decoding modules, delta - sigma modulation is introduced and audio data, preambles with accessorial data are multiplexed according to the digital audio interface standard ; for carrier wave, pll frequency synthesizer is used ; for frequency modulation, voltage control oscillator is taken ; for demodulation, pll frequency discrimination is adopted

    調制方式，並按照數字音頻介面標準對音頻數據、同步字和附加信息進行通道復用;對于載波信號，採取鎖相環頻率合成技術手段;對于頻率調制，採用壓控振蕩器;對于解調電路，採取鎖相環鑒頻電路。
  4. It is well known that the wavelet liner approximation ( i. e, truncating the high frequencies ) can be approximate smooth singals very efficiently. however, for example, piecewise continous signals with large jump in signal value or in its derivatives, standard wavelet linear approximation techniques cannot achieve similar results for signals which are not smooth. to overcome these problems within the standard wavelet transform framework, the paper proposed the double adaptive wavelet transforms

    眾所周知，小波的線性近似（只用低頻系數而不採用高頻系數進行重構的方法稱為線性近似）能非常有效的近似初始的光滑信號。然而對于非光滑信號，例如具有跳變點的分段連續信號，標準小波的線性近似就不能獲得如光滑函數那樣好的結果。
  5. This thesis presents a new audio digital watermark algorithm based on has model. the steps : first, it classifies the signals through fft ; second, calculating the tones, noise and the overall masking threshold of different phases through has, and changing the energy value of tones which are more than that of the overall masking threshold to embed the watermark information

    提出了一種基於人類聽覺系統（ has ）模型的音頻數字水印演算法，該演算法首先對信號進行分段離散快速傅立葉變換（ fft ） ，再根據人類聽覺系統模型計算出各段的類純音、類噪音以及各段的總體掩蔽閾值，通過改變大於總體遮蔽閾值的類純音的能量值來嵌入水印信息。
  6. In addition, the author puts forward that the eggs could be recognized based on the difference in the frequencies of their prompted sounds. because the eggs " prompted sounds are lied on low frequency bands, the microphone and sound amplifier that have excellent duration response should be used. the output signal from the sound amplifier is transferred to data signal by a / d card before it is put into computer

    蛋品激勵出的聲音主要集中在低頻段，因此選擇在低頻段有好的頻率響應特性的麥克風和放大電路；放大輸出信號通過a / d採集板變換成相應的電壓數值信號送入計算機，對離散的信號數據進行傅立葉變換得到它的頻譜圖和各頻段能量分布圖；而後將能量分佈特徵數據作為神經網路的輸入值，這樣，好蛋和破損蛋的模型就建立起來。
  7. And some useful rules are concluded from these experiments. the pd signals on different frequency scopes are surveyed, and the thesis explores anti - noise narrowband detection of partial discharge signals. for the first time the thesis brings forward the choosing - frequency detection of pd ground on the radio frequency communication

    同時，進行了局部放電不同頻段信號檢測，為窄帶抗干擾檢測技術奠定基礎，並首次提出基於射頻通訊原理的選頻檢測原理及檢測設想；在實驗室中進行了局部放電超高頻信號的檢測，驗證了超高頻法檢測局放信號時對空間電暈干擾的抑制作用。
  8. In the end of this chapter, the power spectrum density ( psd ) analysis of hrg is given, which shows that the main noise of hrg is low frequency noise

    論文還對陀螺信號進行了功率譜密度分析，分析結果表明陀螺的主要誤差都集中在低頻段。
  9. The content of this theme is as follows : without time, without open, without stopping railway transport, and without interrupting traction current of block tested, meanwhile track circuit parameters in electrical and no electrical blocks is measured of on - line, dynamic and real - time. these parameters include voltage of fsk signal, voltage of industrial and harmonic wave interference, upper frequency, lower frequency, carrier frequency and low frequency 18 messages frequency

    本課題研究內容：在不要點，不開天窗，不中斷行車，不中斷被測區段牽引電流的情況下，在線、動態、實時測量電化區段和非電化區段的移頻信號電壓、工頻干擾電壓，移頻信號（調頻信號）的上邊頻、下邊頻、載波頻率、以及低頻18信息頻率等參數。
  10. For handling the interference from complex environment, this thesis presents a kind of real time on - line monitoring system. the main works include : 1. by consulting a lot of related documents, analyzing the time domain waveform, frequency - domain waveform and various detecting ways

    圍繞此解決方案主要完成了以下主要工作： 1 ）閱讀了國內外大量相關文獻，透徹分析了局部放電和各種干擾信號的時域、頻域的波形特徵，並對各種檢測手段進行了分析。
  11. Their input and output lines should be decoupled at all frequencies, they should be shielded to prevent external electric and magnetic fields from causing interference, and they should be sited as far as possible from sensitive circuits so that residual electric and magnetic fields are prevented by distance from doing serious damage

    開關電源的輸入輸出線必須進行全頻段去耦處理；要藉助屏蔽手段抑制電、磁干擾；開關電源要盡可能遠離小信號電路，確保其電磁場對模擬電路影響最低。
  12. Secondly, basing on the theory of on - off gain of small signal, the raman gain coefficient for frequency shift between 0. 5 and 20 thz of standard sigle mode optical fiber is measured by pump - probe method through a super luminescent diode ( sld ) as a broadband small signal probe source. thirdly, numerical simulation analysis of gain characteristic of raman fiber amplifier for c band wdm signal light is made according to the raman gain coefficient of the fiber measured before through target and four rank runge - kutta method. at the invariability of wavelength and maximum power of each of two pumps, schematic of powers of two pumps for best flatness on c band wdm optical gain was found out, at the same time, the factors of resulting in gain saturation is analyzed, too

    本文首先應用經典的電磁理論對拉曼光纖放大器的工作機制進行了分析，然後，根據小信號理論推導出的開關增益求出了光纖拉曼增益系數的表達式，採用泵浦-探測波的方法，利用超輻射激光二極體（ superluminescentdiode簡稱sld ）作為探測光源，測量了所用標準單模光纖頻移為0 . 5 - 20thz的拉曼增益系數，之後根據所測得的光纖的拉曼增益系數譜對應用該類光纖構成的放大c波段wdm光信號的拉曼光纖放大器的增益特性採用打靶法和四階龍格- - -庫塔進行了數值計算，在給定了兩個泵浦光源的波長和最大功率后，找出了反向泵浦情況下使c波段wdm光源增益最平坦的兩個泵浦的各自最佳功率，同時也分析了導致信號光飽和的原因。
  13. The type of the base function of wavelet analysis is not single, while the ft has only the sine ( or cosine ) function or exponential function. wavelet transformation has the character of multi - resolution analysis. wavelet transformation can analyze the signal in any precision ( resolution ) at any part of time and frequency according to the different translation factors and dilatation factors

    小波變換具有多解析度分析的性質，對應于不同的伸縮因子和位移因子，小波變換能對信號的任何時間（空間）段、任何頻率段進行任何精度（解析度）的分析，在非平穩信號（包括瞬間信號）的分析中具有很大的優越性，分析時，在信號的低頻部分具有較高的頻率解析度和較低的時間解析度，在高頻部分則具有較高的時間解析度和較低的頻率解析度，被譽為「數學顯微鏡」 。
  14. First, the system converts the received tv program signals into mpeg file with video capture card, cut the mpeg file into several short mpeg files according to the content of the program and establish index for them. then, it transports the short mpeg files to jukebox server. the jukebox server with responsibility for discs management, it record the program material into discs and provide service for clients visit the program online

    系統將接收到的衛星電視信號通過視頻採集卡，把它採集成mpeg文件，再根據節目內容將mpeg文件分段成小的節目素材文件並建立檢索索引，然後將它傳遞到光盤庫服務器；光盤庫服務器負責光盤的管理，它一方面將節目素材文件刻錄到光盤上，另一方面為客戶機提供在線訪問服務；客戶端根據一定檢索條件進行檢索，獲得所需的節目素材文件，並下載到本地，本地的媒體編輯軟體直接對mpeg文件進行編輯，生成新的節目。
  15. Simulation indicates : using band - pass sampling is right in digitalizing if signal ; it is necessary to use special chip to process if digital signal ; at the same time, it is feasible to process base - band low speed signal ( am, fm etc. ) by software

    模擬表明：中頻數字化技術，使用帶通采樣方案是恰當的；現階段對中頻采樣信號使用專用晶元作降速率處理是必然選擇；同時，對基帶低速率信號（如am 、 fm 、 bpsk信號）作全數字化軟體處理是切實可行的。
  16. In vibration test, the signal is always along with noise. if the noise belongs to white noise, fourier transform is very suit to identify and process it, after then remove it. but when there exists low energy impact signal, traditional band pass filter remove noise and the precise position of impact signal is blured

    對于白噪聲，由於它是穩定信號，所以也可以使用fourier變換定位，以便在合適的頻段進行提取。但是對于低能量突變瞬態信號，在信噪比比較低的情況下，由於帶通濾波的平滑作用，瞬態信號的位置信息也變得很模糊了。
  17. Secondly, it provides the technological requirement and the whole device frame. the process of development is illustrated by software and hardware ( emphasis on software ). it also provides the introduction of dsp, frequency scan, channel scan, radio direction finding and signal analysis, ect

    其次，提出了短波監測設備的技術要求和總體設計框圖，並從軟硬體兩方面（重點是從軟體方面）對研製過程進行了陳述，對dsp選型、頻段掃描、通道掃描、信號測向和信號分析等做了說明。
  18. Analyzing real hrv, proving the every segment power ( high frequency > low frequency ) of projection in frequency axis is times with the every segment power by using fft, the lf / hf by using 2 method is primarily sameness. 3d figure is a trenchancy tool for doctor to look over the relation between time and frequency

    對實際的心率變異信號進行了維重慶大學碩士學位論文格納分析，證實通過計算三維時頻分佈對頻率軸的投影得到的各頻段（高頻段、低頻段等）功率，與直接用fft所得各頻段功率，二者只相差一個比例系數，並且二者lf hf的值基本相同。
  19. At the beginning, this paper has some brief dissertation on the basic principle of the dsl and the multimedia data compression, the key technique of sdsl, the transport protocols, and the data transfer system structure based on the twisted - pair. then it gives an analysis of the point - to - point data link protocol ( ppp ) and the real - time transmission protocol in detail, which provide the side - to - side transmission service for audio frequency and video frequency data, and so on based on the these, we developed a multimedia sdsl modem system used to transfer data and phonetic

    本文首先對dsl系統和多媒體數據壓縮技術的基本原理、 sdsl的關鍵技術、傳輸協議以及基於雙絞線的數據傳輸系統的結構進行了簡要的論述，並詳細分析了點到點的數據鏈路協議（ ppp協議）以及實時傳輸協議，其為音頻、視頻等實時數據提供端到端的傳送服務。可以向接收端傳送恢復實時信號必需的定時和順序信息，並向收發雙方和網路運營者提供qos監測手段。
  20. This paper is described wavelet transform theory, mother wavelet choice, the method to filter signal by wavelet transform and the result, prospered a way to extract feature originated from wavelet theory, which using wavelet packet analyzing method to subdivide signal both in low frequency and high frequency field, and consider energy of every layer as feature in frequency field, and in conjunction with the detailed analyzing character of wavelet packet in time - frequency plane, consider several minimum or maximum points in the lowest frequency band a s features in the time field

    本文介紹了小波變換的理論、基小波的選擇和利用小波變換進行信號濾波的方法和濾波處理結果，並提出了一種基於小波理論的新的特徵值提取方法。即利用小波包分析方法將信號在低頻、高頻段作進一步的細分，以各層分解的能量作為信號的頻域特徵值，以最低頻帶的極值點作為時域特徵值，這樣的特徵值選取方法較全面的反映了信號的時-頻特徵，優于傳統的傅里葉分析方法。
分享友人
分享到 Line

分享到臉書