窄帶信號 的英文怎麼說

中文拼音 [zhǎidàixìnháo]
窄帶信號 英文
narrow band signal
  • 窄 : 形容詞1. （橫的距離小） narrow 2. （心胸不開朗; 氣量小） petty; narrow 3. （不寬裕） hard up; badly off; short of
  • 號 : 號Ⅰ名1 （名稱） name 2 （別號; 字） assumed name; alternative name3 （商店） business house 4 （...
  1. The apparatus uses 880, 950nm nir led as light source, interference filter as homochromy device, si photronic as detector. digital signal comes from ad transformation, processed by microprocessor system

    以880 、 950nm的近紅外led為光源， 14個窄帶干涉濾光片為單色器，以硅光電池為檢測器，經ad轉換得到數字信號，送單片機處理。
  2. This method uses two spatially separated receiving equipment. cross correlation of the two outputs will therefore yield the auto correlation function ( acf ) of the signal, plus noise which is spread uniformly over the whole width

    該演算法採用空間上分離的兩路接收設備，通過對包含同一個信號的2個輸出信號互相關，得到信號窄自相關函數（ acf ）和在整個帶寬里均勻分佈噪聲成分。
  3. The signal format of gps is analyzed, the principle models and mathematical models are established, the ber performance is analyzed in a channel interfered with wide - bandwidth awgn, narrow - bandwidth awgn, transmitted signal, single - tone signal respectively. based on the results above interference methods are discussed and simulated. then the performance of code acquisition and code trace of a digital gps receiver are discussed. the modem of linkl 1 and link4a are modeled and their ber performances are analyzed and simulated in channel s interfered with awgn, single - tone signal and multi - tone signal respectively

    建立了jtids的收發終端的數學模型，分析它在噪聲干擾、相關干擾、互相關干擾下的誤碼性能，提出較佳的干擾方法和干擾碼型，並進行模擬模擬；分析了gps的信號格式，建立了gps的原理框圖模型、信號數學模型，並對其在寬帶噪聲干擾、窄帶噪聲干擾、轉發干擾、單頻干擾等情形下的誤碼性能進行了分析比較，提出相對較佳的干擾方法，並做了計算機模擬，針對一數字式gps接收機中擴頻碼捕獲與跟蹤環的特性進行分析；建立了link11和link4a數據鏈調制解調數學模型，對它們在噪聲干擾、單音干擾、多音干擾等下的誤碼性能進行分析，最後對干擾情況進行了模擬模擬。
  4. Acoustics. audiometric test methods. part 2 : sound field audiometry with pure tone and narrow - band test signals

    聲學.聽力測定試驗方法.第2部分:純音和窄頻帶信號聲場測聽術
  5. Frequency response, quantization noise, reconstruction error and its sensitivity to mismatch among adcs are studied at length in prqmf banks adc system, and the theoretic results include : ( 1 ) the distortion / aliasing functions of hybrid filter banks adc system is similar with that of switch capacitor filter banks adc system ; ( 2 ) for wide or narrow band input signal, the effective resolution of the two adc systems is 0. 51og2m bits higher than their adc ; ( 3 ) reconstruction error ' s sensitivity to mismatch among adcs of the two adc systems is reduced effectively than time interleaved adc system

    2對prqmf濾波器組adc系統的頻響、量化噪聲特性、重建誤差特性以及重建誤差對adc間的失配敏感性進行了理論分析研究，所得到的理論結果為： （ 1 ）混合濾波器組adc系統與開關電容濾波器組adc系統的失真/混迭函數一致； （ 2 ）無論輸入寬帶還是窄帶信號，這兩種adc系統的有效解析度均比其adc提高了0 . 5log _ 2m比特； （ 3 ）這兩種adc系統的重建誤差對其adc間的失配敏感性均明顯低於時間交織adc系統。
  6. Acoustics - audiometric test methods - part 2 : sound field audiometry with pure tone and narrow - band test signals ; identical with iso 8253 - 2 : 1992

    聲學.聽力試驗方法.第2部分:純音和窄頻帶信號聲場測
  7. The fundamental concepts and theories of array signal processing are discussed. the definition and presentation of the narrowband signal is introduced briefly, and the technology of orthogonal sample is illustrated. then the statistical model of array signal processing is presented

    系統概要地論述了陣列信號處理的基本概念和理論，分析了陣列處理中窄帶信號的定義和表示方法，闡明了正交采樣等采樣方法，給出了陣列信號處理的統計模型。
  8. Subsequently, the primary knowledge of sound wave and the model of signal transmission are introduced. at last, the models of the narrowband and broadband array signal processing, the theory of the number of source signal estimation, the theory of invariable estimation and usage of high - order statistics in array signal processing are presented

    文中詳細介紹了聲波傳播的基本知識、信號傳輸模型；窄帶和寬帶信號的陣列處理模型；信號源個數估計理論；波達方向估計理論以及高階統計量在陣列信號處理中的應用。
  9. Secondly, ground on the duct noise control, the delayed - lms algorithm, which is actulized easily, is brought forward, then the simulation on pc is achieved. it is shown from the computer simulation that for the single frequency noise, there will be a good effect when choosing the suitable parameters ; but for the narrowband noise, the effect will become worse with increasement of the bandwidth. this result is helpful to analyze the parameters influencing anc

    結果表明： （ 1 ）隨著濾波器長度的增大，系統收斂速度變快； （ 2 ）隨著值的增大，系統的收斂速度增大，但是當值超過某一范圍時會引起系統的發散； （ 3 ）次級通路的延遲數與初級噪聲頻率有關； （ 4 ）對于窄帶信號， dlms演算法可以取得一定的降噪量，但是隨著窄帶信號帶寬的增大，降噪效果明顯變差。
  10. Digital down - converter ( ddc ) is one of the key technologies used by sdr receiver. the ddc module is a data processing part, following the ad sampler. the main function of ddc is extracting narrow - band data from broad - band data which is digitalized by ad sampler, down - converting these data to base - band, and decreasing data rate as well

    Ddc數字下變頻器技術作為軟體無線電中的核心技術，是緊跟在ad采樣后的一個處理模塊，他的主要功能是從輸入的寬帶高速數字信號中提取所需的窄帶信號，將其下變頻為數字零中頻，並降低數據的速率。
  11. Based on fourth - order cumulant, a computationally efficient method for joint estimating both directions of arrival and ranges of near field sources with known carrier frequency is firstly presented. the proposed algorithm need not any spectral peak searching and the 2 - d parameters are automatically paired. lt is suitable for arbitrary additive gaussian noise environment. in the following section, a 3 - d esprit method for jointly estimating of frequencies, doa ' s and ranges of multiple near - field sources with unknown carrier frequencies is proposed. the parameters estimation are given by the eigenvalues of different matrices. furthermore, its performances are confirmed by several computer simulations

    利用四階累積量，第五章首先給出了一種載頻已知的情況下基於近場源的距離和波達方向聯合估計演算法，通過構造的陣列輸出信號四階累量矩陣使空間信號到達方向和距離估計無需譜峰搜索，且參數自動配對，適合於任意高斯噪聲環境。進一步在第三節提出了一種載頻未知的情況下的多個近場窄帶信號源doa 、距離和頻率聯合估計的3 - desprit演算法。
  12. The analysis of wideband signals will improve the resolution capability and accuracy of estimation, for more frequency components can be synthetically used. constant beam - width beam - former and direction of arrival of sources for wideband signals are the important parts of wideband array signal processing

    高分辨演算法最初都是在窄帶信號的假設條件下提出的，由於寬帶信號含有更豐富的信息，有利於目標檢測、參量估計和目標特徵提取，因此，對于寬帶信號處理的研究越來越多。
  13. Pppoe is an extension of the traditional pstn narrowband dial - up technology over the ethernet. its main advantages are reflected in its consistency with the user certification system of the original narrowband network and the convenience it brings in both user and service management. so it is well adapted to the current operation and maintenance system of telcos and has been widely adopted in shanghai

    Pppoe是傳統pstn窄帶撥號接入技術在以太接入技術的延伸，和原有窄帶網路用戶接入認證體系一致，有利於用戶及業務的管理，適應目前電信公司的運行維護體制，因此在上海目前均採用pppoe認證。
  14. Its basic function is to pick up the narrowband signals from the broadband & high speed digital signals, and transform it to the baseband. then the low speed baseband signals are sent to the following dsps for processing

    其基本功能是從輸入的寬帶高速的數字信號中提取所需的窄帶信號，將其下變頻為數字基帶信號，並轉換成較低的數據率，以供后續的dsp作進一步的處理。
  15. Broadband source location method is investigated by using signal - phase - matching principle, and simulations and experiments are carried out to show the validity of the method ; two high resolution algorithms of broadband signals are proposed, which are the dft interpolation algorithm and the frequency invariant beam space algorithm. the proposed algorithms have no requirement for prior information of source locations, so the results of doa estimation can be unbiased ; a method of temporal - spatial averaging, which can improve the performance of doa estimation for uniform linear arrays, is given. this method can be applied in the most narrowband or broadband eigen - structure based high resolution algorithms

    提出了利用信號相位匹配法的寬帶信號方位估計方法並從模擬和實驗兩方面對其進行了驗證；提出了基於dft插值的和基於頻率不變響應波束域的兩種寬帶信號高分辨方位估計演算法，這兩種方法在進行方位估計時均不需要進行方位預估，從而避免了因角度預估可能帶來的估計偏差；最後提出了一種提高均勻線列陣方位估計性能的時空平均法，該方法可適用於多數窄帶或寬帶的特徵結構類高分辨方位估計演算法中。
  16. The method of using a single wideband facility to transmit many relatively narrow - bandwidth signals by subdividing the frequency spectrum used in the wideband channel

    使用單個寬帶設備傳送許多窄帶信號的方法。它是通過細分寬帶通道上的頻譜來實現的。
  17. If the broadband signal is dealt with the narrow beam former, the serious disorder of the signal will be occurred

    如果簡單的用窄帶波束形成器處理寬帶信號，會使信號產生嚴重的畸變，這就提出了寬帶波束形成的問題。
  18. Broadband array signal processing is a main direction of underwater acoustic signal processing, but the broadband signal processing is more complex than that of narrowband

    寬帶陣列信號處理是水聲信號處理的一個主要研究方向，但是寬帶水聲信號的處理遠比窄帶信號復雜的多。
  19. Get the approximate and the accurate correlation equations of pressure and velocity for narrowband signal, and the approximate correlation equation for broadband signal. 4. introduce the method of the genetic algorithms, and perform an improvement

    在窄帶信號下，得出了近似條件下和精確條件下的相關方程，而在寬帶條件下，得出近似條件下的表達式，從理論上推導出了聲壓和質點振速之間的相關方程組。
  20. Because of the good sensibility, ultrasonic narrow band signal analysis technique with 1mhz central frequency was chosen to differentiate the heat treatment samples above - mentioned. there are obvious differences among heat treatment products in principal frequency, spectral peak ' s quantity, amplitude and distribution. that is to say, the technique of ultrasonic narrow band power spectral can be applied to characterize the microstructures of multi - phased alloy steels

    利用窄帶信號頻譜分析技術靈敏度高的突出優點，選取中心頻率為1mhz的窄帶超聲信號，對上述不同熱處理試樣進行超聲功率譜分析，發現不同熱處理產物在功率譜主頻率、譜峰特徵（幅度、數量、分佈）等方面，都存在不同程度的差異。
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