band of frequencies 中文意思是什麼

band of frequencies 解釋
頻率帶
  • band : n 1 帶，繩；帶形物；箍；箍條；嵌條；鑲邊；鋸條； 〈pl 〉 （法官等的）寬領帶。2 束縛，羈絆；義務；...
  • of : OF ＝Old French 古法語。
  • frequencies : 頻數分佈分析
  1. In designing the complex weights for center frequencies of each sub - band, an optimizing method using semi - definite programming " is proposed

    在設計各子帶中心頻率上的恆定束寬加權時，提出了一種半定規劃的優化方法。
  2. Firstly, this paper introduces the basic structure of narrow band fir digital filters. secondly, it analyses the components of narrow band fir digital filters, which conclude cic filter, hbf filter, resampling techniques. based on these analyses, the paper gives the full structure of narrow band fir digital filters and analyses its characteristics, which are frequencies response, anti _ aliasing and anti _ image

    本文首先簡單介紹了窄帶fir濾波器的基本結構，然後對窄帶fir濾波器的各組成部分進行了詳細分析，內容包括：積分梳狀濾波器（ cic ）的特性和設計，半帶濾波器（ hbf ）和整形濾波器的特性和設計，重采樣技術的原理與實現。
  3. Select installation and then antenna setting, and set respectively the local oscillator frequencies of the high - frequency tuner of 146, 138ku, 138c band and so on

    選擇安裝里的天線設定，分別設置146 、 138ku及138c波段等等的高頻頭本振頻率。
  4. For slow targets whose doppler frequencies fall into clutter doppler band, the performance of frequency domain one - dimension filtering is seriously degraded. in an airborne radar, there is interdependence between the clutter doppler frequency and spatial position. space - time adaptive processing ( stap ) utilizes this interdependence to suppress clutter and get perfect main - lobe and side - lobe clutter suppression

    空時自適應處理利用機載雷達地雜波多普勒頻率與地雜波空間位置的耦合性，根據目標和雜波在空間-多普勒頻域二維空間分佈上的差別對雜波進行抑制。
  5. For the operating frequencies of modern radars and guidance 、 electronic countermeasure system 、 communication system 、 remote sense and remote measurement system expand to millimeter band step by step, the operating frequencies of t / r module raise ceaselessly. simultaneity millimeter wave t / r module which has the advantages of small dimension, lightweight, wide band is more suitable to the requirement of modern army and communication system. this paper is mainly referred to the research of t / r module in ka band

    現代雷達與制導、電子對抗、通信、遙感遙測系統的工作頻率已逐步由微波波段擴展到毫米波波段，因此t / r組件的工作頻率也在不斷的上升，同時，毫米波t / r組件與微波t / r組件相比具有尺寸小、重量輕、頻帶寬等優點，更適合現代軍事和通信系統的要求。
  6. A revised plane - wave expansion method for quickly calculating the band structure of a photonic crystal of pixel type is used to design a photonic crystal of square lattice with a large absolute band gap at high frequencies

    本文用修正後的平面波方法，數值分析了由常見的半導體材料gaas （ = 11 . 4 ）和空氣為介質組成的二維光子晶體的能帶結構，發現了一些有意義的結果。
  7. Firstly, frequencies of each mode shape are gained through frequency spectrum analysis of time domain signals of key points. secondly, time domain signals, which correspond to structural mode shapes, are gained through band - pass filter technology. lastly, the corresponding mode shapes of each natural frequency are constructed by using time domain signals, which are processed by band - pass filter technology

    該方法的基本思想是先通過對關鍵點處時域信號進行譜分析得到結構各階振型對應的固有頻率，然後通過帶通濾波技術得到結構關鍵點在每階固有頻率下對應的時域信號，最後用濾波后時域信號構建結構在每階固有頻率下對應的振型。
  8. The difference, expressed in hertz, between the two limiting frequencies of a band

    一個頻帶的上下界頻率之差，單位用赫茲表示。
  9. The direct digital frequency synthesizer is a kind of fully digitized frequency synthesizer, which consists of the phase accumulator, the sine look - up table, the digital to analog converter and the low band filter. it is of high frequency resolution, fast frequency switching speed, low phase noise, the ability to switch frequencies while maintaining constant phase, and the ability to producing arbitrary waveforms

    直接數字頻率合成器是一種全數字化的頻率合成器，由相位累加器、波形rom 、 d a轉換器和低通濾波器構成， dds技術具有頻率解析度高、頻率切換速度快、頻率切換時相位連續、輸出相位噪聲低和可以產生任意波形等優點。
  10. There is a penalty to be paid for the lower rate : a narrower band of frequencies will be recorded

    低取樣率是有代價的：被記錄的頻率波段會很窄。
  11. With this method, different shielding materials of every layer can be achieved under the circumstances of the prespecified shielding effectiveness ( se ), different incident angles and the prespecified band of frequencies

    通過該演算法，可以設計出在指定屏蔽效能、不同入射角度的電磁波和指定的頻帶要求下的各層屏蔽材料。
  12. The low frequencies in mra are in good resolution, but the high ones are not. however, the wavelet packet can overcome the shortcomes in high frequencies and it can make the width of each frequency - band same. however, the calculations are large as the decomposed layer is much high

    多分辨分析mra的低頻解析度較好，但其在高頻部分卻不太理想，而用小波包可以克服mra在高頻部分的缺陷，並且可以做到每個子頻率帶寬都相同。
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