選頻系統 的英文怎麼說

中文拼音 [xuǎnbīnxìtǒng]
選頻系統 英文
frequency selective system
  • 選 : Ⅰ動詞1. （挑選） select; choose; pick 2. （選舉） elect Ⅱ名詞（挑選出來編在一起的作品） selections; anthology
  • 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...
  • 系 : 系動詞（打結; 扣） tie; fasten; do up; button up
  • 統 : Ⅰ名詞1 （事物間連續的關系） interconnected system 2 （衣服等的筒狀部分） any tube shaped part of ...
  • 系統 : 1. （按一定關系組成的同類事物） system 2. （有條理的;有系統的） systematic
  1. And then facing the problem of the channel estimation of the adaptive modulation system, we conclude out the channel estimation algorithms on maximum likelihood ( ml ) estimation and maximum a posteriori ( map ) estimation under the condition of flat fading channel and selective fading channel in detail. to meet flat fading channel, we simulate the relationship of the ratio between the error covariance in map estimation and ml estimation and pilot symbol message length. the conclusion can be drawn from these results

    接著，對自適應調制系統中的通道估計問題難點，詳細推導了平衰落通道條件下和選擇性衰落通道條件下最大似然（ ml ）估計和最大后驗概率（ map ）估計演算法，針對平衰落通道，我們模擬了map估計和ml估計的方差與導頻符號長度的關系，模擬結果表明，錯誤方差受多譜勒頻率的變化影響最大，並且對實際的自適應調制系統，導頻符號長度的取值超過20個符號長度時， map通道估計明顯優于ml通道估計。
  2. On the base of researching the theory of the scheme and analyzing the signal feature, it is obtained that the existence manners and character of distance information in the differential frequency signal. at the same time, a new conclusion is gained that the technology of frequency agility can decrease the constant error of system. it is also to say that frequency agility and frequency modulation fixed - distance fuze has the similar feature to random period frequency modulation fixed - distance fuze. according to the theory of address coding in the hopping - frequency communication, the paper presents the principle of selecting the frequency agility sequence which fit to the radio fuze and constructs the frequency agility sequence family based on the rs codes

    在深入研究方案原理和分析信號特徵的基礎上，獲得了該體制引信差頻信號中，距離信息的存在形式和特點，得出了頻率捷變技術的引入降低了系統定距固定誤差這一新的結論，即頻率捷變調頻定距引信在定距性能上具有類似隨機周期調頻定距的特徵。本文引入跳頻通信地址編碼理論，結合無線電引信的具體特徵，提出了適用於無線電引信的頻率捷變序列的選擇原則，並構造了基於rs碼的寬間隔頻率捷變序列族。
  3. Firstly, we study the construction of emotion - speech template database, and analyze the common features such as pitch, energy and formant. after choosing the useful features by using fuzzy entropy effectiveness analysis, we get better performance with the application of neural network. in addition, we propose some more efficient features such as speech rate, pitch slope, mel - frequency cepstral coefficients and its transient parameters, and design a processing model based on vector quantization for cepstral features to fusing different features

    本文首先介紹了情感語音數據庫的建立情況，然後研究了基音頻率、振幅能量和共振峰等目前常用的情感特徵在語音情感識別中的作用，並且通過一種基於模糊熵的特徵有效性分析方法進行了有效特徵的篩選，應用人工神經網路建立了初步的語音情感識別模型，經過實驗發現特徵篩選后系統的識別效果有著一定程度的提高。
  4. In the first part of the paper, the development of motor control system fault diagnosis theory is summarized. on the basis of the analysis of the characteristics of wavelet, the theory is discussed and the definition of the singularity is given. because of the localization property of wavelet transform, wavelet analysis can be used to detect the characteristics of the singularity from the signal and intermittence fault problems lying in the motor under test

    著重介紹了小波分析在電機控制系統故障診斷中的應用，根據小波理論在時域和頻域良好的局部化性質，討論了利用小波變換來檢測信號的奇異特徵的原理，給出了小波變換對信號奇異性特徵檢測的方法，針對實際應用，對小波基函數選取及小波分解尺度進行了探討。
  5. In this paper, research on the algorithm of complete digital if and baseband transmission system and the realization of transmitter and receiver. / 4 - dqpsk is chosen as digital modulation scheme. the scheme of demodulation is baseband differential detection. sliding correlator can realize the symbol synchronous acquisition ; early - late gate synchronizer is used to do symbol synchronous tracking

    系統的發射機選定/ 4 - dqpsk為調制方式，接收機採用基帶差分解調的非相干解調方式，滑動相關器捕獲發送的pn序列，早遲門同步器跟蹤符號同步，使用相關器對同步后的符號進行最佳判決，並在這些演算法實現的基礎上，實現了直接序列擴頻和解擴技術。
  6. 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。
  7. The rf front - end structure is predigested greatly due to using the electronically tunable filters

    由於電調濾波器的選用，降低了射頻前端系統的復雜度，射頻結構得以大大簡化。
  8. Firstly, how to choose spreading factor of non - coherent dcsk system that minimizes the bit error rate for a given eb / n 0 is discussed in this paper

    文中首先討論了非相干dcsk系統在給定eb / n0下，如何選擇擴頻系數使其誤碼率最低問題。
  9. Secondly, based on the syntony frequency and the elasticity mechanics and other correlative professional knowledge, establishes a suit of fsm vibration module system, selects the structure, material and the process and treatment technique of the elastic element in the elastic system of the mirror, analyzes a lot of factors which affect the structure of the rapid controlling reflector and provides the derivation formula

    以諧振頻率為出發點，利用彈性力學等相關專業知識，建立一套fsm的振動模塊系統；確立了反射鏡彈性系統中彈性元件的結構、材料的選擇，及加工，熱處理。分析了影響快速控制反射鏡結構的諸多因素，給出其相關推導公式，最後應用solidedge和cosmos軟體對該結構進行了計算機模擬。
  10. It mostly includes the analysis of video collection and codeing module, which compared the virtu of existing mpeg codeing mode. and choose the most suitable mode

    主要包括對視頻採集處理技術分析，對視頻採集壓縮處理模塊的分析，比較了現有的mpeg的編碼方式的優劣，並選取適當的方式應用於系統中。
  11. The approximate computation method is used in float point computation of system ' s control algorithms on fixed - point dsp after comparing several methods in respect of running time and program space involved, which attains quick computation besides high precision and implements output voltaic with low harmonic and high control precision of frequency

    通過從運行時間和佔用空間等方面比較在定點dsp上實現浮點數運算的幾種方法，並選擇了近似計演算法作為系統控制演算法浮點數運算的方法，在保證足夠計算精度的前提下達到計算的快速性，實現低諧波和頻率控制精度高的輸出電壓。
  12. The bt819a of brooktree corp is selected for front - end video a / d transforming, bt852 as video d / a, and the tms320c6711 of ti corp. selected for h. 263 core algorithm processing in the system hardware design

    該系統硬體設計選擇了conexant公司的bt819a晶元為前端視頻採集a d晶元， bt852晶元作為後端視頻的輸出d a晶元，完成對視頻信號數字化和逆處理，為dsp對系統功能處理作好準備。
  13. The editing system interface of media asset management system integrates the user authority identification, the module of downloading and uploading, the selection of programs and advertisements, the configuration of transferring data information, the display of downloading stuff information, the restriction of system requirement, audio formats ’ selectivity conversion and other functions

    媒體資產管理系統的編輯系統介面里，集成了用戶權限識別、導入導出模塊、節目廣告分選、上傳素材信息設置、下載素材信息顯示、系統要求限定、音頻格式可選擇性轉換等功能。
  14. At the same tune, the paper analyses and discusses the control projects of the above parts. as for the hardware of the control system, on principle of reliability and considering the badly working condition of the vibratory roller, the paper chooses the special controller sp ecializing in the realm of construction machinery ' s control system in order to insure the reliability of the control system and simplify it. about the control quality of the system, the paper establishes the mathematical modes of the frequency modulation system and the amplitude modulation system, analyses the irrationality of the amplitude modulation project, puts forward to apply proportional - integral - differential controller ( pid controller ) to the traveling system and frequency modulation system

    作為控制系統的方案設計的基礎，本文首先對影響壓實效果的振動參數進行了分析；然後針對智能振動壓路機的功能要求，將控制系統分為壓實參數的自動和手動控制、行走控制、轉向和蟹行控制以及智能灑水控制等幾個部分，對各部分的控制方案進行了分析對比和論證；在控制系統硬體設計方面，以可靠性為原則，考慮到振動壓路機的惡劣工況，選擇了專用於工程機械控制領域的專用控制器，使系統的硬體設計得以可靠性保障和簡化；針對控制系統控製品質問題，建立了調頻和調幅系統的控制模型，對調幅系統的控制不合理性進行了分析，提出採用pid控制器對行走和調頻系統進行校正；在軟體設計方面，對各個控制部分進行了軟體編程流程圖設計。
  15. Mtcem ( multi - tone envelope method ) can accurately forecast performance parameters on a set of stored channel and directly decide usable frequency choice. as hf channel characteristic is closed to gauss, mtcem may be simplified to multi - tone envelope method rtce system. for certain user ' s request and link status, double tone complex envelope method rtce, double tone envelope rtce, adaptive hf channel sounding and communication system, all that can easily derived from mtcem

    多音復包絡實時選頻系統，當通道特性近似於高斯通道時，整個系統可以簡化為多音包絡法實時選頻系統，針對不同的用戶要求和電路通道狀況，很容易由它派生出較為簡單的系統，如雙音復包絡法實時選頻系統，雙音包絡法實時選頻系統，短波自適應通道探測和通信系統。
  16. To assure that the hybrid ds - fh spread - spectrum communication mode has better capability of information safety and inference suppression, i bring forward a design scheme of ds - fh spread - spectrum communication system and solving effectively the crucial problem such as how to choose the user address, how to choose the hopping frequency and how to avoid the collision of the frequency which is used by different users at the same time

    為保證系統可靠、有效地工作，本文提出了一種ds - fh混合擴頻系統的設計方案，並且有效地解決了系統的用戶選址、頻率選擇和頻率碰撞等關鍵問題。通過系統設計模擬證實了ds - fh混合擴頻系統具有優于ds系統的抗干擾性能，並在一定程度上提高了系統的抗遠近效應能力。
  17. Research on optimize of logistic - map sequences based on parallel combinatory spread spectrum communication

    并行組合擴頻系統中混沌序列優選的研究
  18. Service option standard for wideband spread spectrum systems

    寬帶擴頻系統的業務選項標準
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    公司擁有完善的網路視頻選人系統，全方位的技能培訓，別墅式的實踐環境.嚴格的管理體制.依託總部上海妙心的成功管理經驗，願在家政服務業不斷耕耘，切實有效地滿足客戶的要求，提供量身定做的個性化服務，把健康、舒適、幸福帶入千家萬戶。
  20. This essay will introduce what has been done by the author in the development of the system, including choosing video velocity measurement + character recognition algorithm based on wavelet transform + dsp as the system solution ; development of vehicle accurate position calculation algorithm for video velocity measurement and filed test ; development of fast character recognition algorithm based on wavelet transform for dsp platform and performance test ; transplanting the fast character recognition algorithm from industrial control computer to dsp platform and performance test

    本論文介紹的作者在開發本系統中所做的一些工作，包括選定系統採用視頻測速+小波變換字元識別+ dsp的方案；開發了視頻測速所用的車輛精確定位演算法並進行了實地測試；開發了適用於dsp平臺的基於小波變換的字元識別快速演算法並進行了性能測試；將系統核心部分的字元識別快速演算法成功移植到dsp平臺並進行了性能測試。
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