frequency selectivity 中文意思是什麼

frequency selectivity 解釋
頻率選擇性
  • frequency : n. 1. 屢次，頻仍，頻繁。2. （脈搏等的）次數，出現率；頻度；【物理學】頻率，周率。
  • selectivity : n. 1. 選擇；精選。2. 【無線電】選擇性；選擇度；【物理學】選擇能力；選擇率。
  1. As an important target of frequency synthesizer design, phase noise determines system ’ s sensitivity and selectivity whose design is being the emphasis as well as nodus at all times

    它作為頻率合成器的重要指標，決定了系統的靈敏度和選擇性能，一直是設計者的難點和重點。
  2. Low losses and frequency selectivity at the same time

    能，低消耗和同步的頻率選擇功能。
  3. By making full use of favourable narrow - band tracing filter character of pll and by combining the merits of dds such as super fine frequency resolution 、 high frequency accuracy 、 very fast frequency hoping with it, the pll / pll + dds frequency synthesizer presents wide band high quality source and super small frequency hoping step. while the electronically tuned filter abates the image interference and notably improves the selectivity. the theorem of frequency synthesizer and center - frequency - fixed filter is simply but adequately introduced first in this paper

    課題中所採用的pll或dds pll鎖相頻率合成方法充分發揮鎖相環良好的窄帶跟蹤濾波特性，並結合dds的高頻率解析度、高頻率精確度和高速頻率捷變等優點，分別實現了系統所要求的高質量寬帶本振源和小步長頻率捷變；採用電調諧選頻技術，則大大改善了接收機的選擇性和抗干擾能力。
  4. And typical super heterodyne structure in rereiver part. this scheme benefited to reduce frequency error and phase error, and had the advantages of good dynamic range and selectivity, short exploitation cycle and small venture in the given performance demand, etc. this system implemented a six - layer hoard rf handset model together with baseband by using advanced eda tool veribest 2000

    系統設計應用hd155131的gsm900 dcs1800雙頻解決方案，發射機部分主要採用offsetpll方案，該方案有利於減小系統的頻率誤差和相位誤差；接收機部分採用典型的超外差式結構，它具有優良的動態范圍和選擇性，在給定的性能要求下具有開發周期短、風險小等特點。
  5. According to the theory of digital signal processing, discrete fourier transform has selectivity to frequency just as spectrum analyzer

    根據數字信號處理理論，離散傅里葉變換（ dft ）演算法對頻率具有選擇性，有相當于頻譜儀的功能。
  6. Acent frequency selectivity

    鄰近頻率選擇性
  7. The millimeter wave diplexers used in the ka - band satellite communications are investigated. these diplexers are of high working frequency, narrow passband and high selectivity, which demands the channel filters good performance

    所研究的毫米波雙工器工作頻率高（接近40ghz ） ，收發通道帶寬窄、接收頻率和發射頻率間隔很小。
  8. Be based upon the studies of sea optical scatter channel by use of monte carlo simulation, the channel is described as a multipath routeway in this paper. the effect on the communications performance, created by the frequency selectivity decline caused by the multipath routeway, is worked over. the correlation bandwith of sea optical scatter channel is analyzed and quantified through the simulation on the computer

    基於對海水通道的蒙特卡羅模擬，本文對海水通道進行了多徑化描述，研究了由於通道的多徑化所產生的頻率選擇性衰落對通信質量的影響，分析並通過計算機模擬確定了海水通道的相關帶寬。
  9. Gabor transformation : in frequency field, gabor transform has sound direction selectivity. selecting a certain direction and picking - up corresponding feature value by this means was another choice for image research

    基於頻率域分解的gabor變換， gabor變換有著比較好的方向選擇性，利用這一點特性，為圖像分析提供了另一個思路。
  10. Finally, this thesis put forward the application of frequency diversity reception to the counteraction against the frequency selectivity decline in the airborne oceanic submarine laser communication system, and whose capability graph is educed through the simulation on the computer

    文中提出把頻率分集接收技術應用於對潛通信中，以達到抗頻率選擇性衰落的目的，並通過計算機模擬得出了其性能曲線。
  11. Much attention has been paid to it, because the system can achieve better performance than conventional cdma in high data applications and it is potentially robust to channel frequency selectivity

    Cdma技術和ofdm技術結合產生了多載波cdma系統，它很好地解決了高速數據業務下傳統cdma系統性能下降等一系列問題。
  12. Stfs is a good coding arithmetic which is simple and easy to realize. moreimportantly stfs has higher diversity order and encoding gain than sts at the samesymbol rate. it can repel channel fading, improve data rate and wireless systemcapacity availability, stand against frequency selectivity fading, eliminate theintersymbol interference

    該編碼演算法不僅在方法和原理上簡單，而且易於實現，在相同符號率下比空時擴頻具有更大的分集度和更高的編碼增益，能有效抵抗通道衰落、提高數據速率、提高無線系統容量、很好的對抗頻率選擇性衰落和消除符間干擾。
  13. The results indicate : ( 1 ) there are interactions between the neurons in iso - frequency laminas and hetero - frequency laminas, and the mutual inhibition is predominant ; ( 2 ) the mutual inhibition of the inferior collicular neurons can increase the frequency selectivity, and play an important role in modifying the discharge features of the neurons

    上述結果表明： （ ）下丘神經元聲信號處理過程中，位於同頻層內及非同頻層的神經元之間存在相互作用，該作用以相對抑制為主； （ 2 ） ic神經元之間的相互抑制作用可增強神經元的頻率選擇性，並對神經元的發放特徵有重要的修飾作用。
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