頻數直方案 的英文怎麼說

中文拼音 [bīnshǔzhífāngàn]
頻數直方案 英文
frequency histogram
  • 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...
  • 數 : 數副詞（屢次） frequently; repeatedly
  • 直 : Ⅰ形容詞1 （成直線的; 硬挺的） straight; stiff 2 （跟地面垂直的; 從上到下的; 從前到后的） erect; v...
  • 方 : Ⅰ名詞1 （方形; 方體） square 2 [數學] （乘方） involution; power 3 （方向） direction 4 （方面） ...
  • 案 : 名詞1 （長桌） table; desk 2 （案件） case; law [legal] case 3 （案卷; 記錄）record; file 4 （提...
  • 方案 : scheme; plan; programme; project; proposal; suggestion; formula; scenario; outline
  1. Under windows nt and labview development environment, using the linear fit module, exponential fit module > general polynomial fit module of labview to design a method for fitting the experiment data, the results of curve fitting indicate that the purpose of general polynomial fitting is better than the rest. separating the equivalent input impedance of magnetostrictive transducers without stimulate current from input impedance of it with stimulate loop based on the results of curve fitting, and determining the syntony frequency and electric simulation network parameters of magnetostrictive transducers by this input impedance. finally, with labview network functions, realizing magnetostrictive transducer electric simulation system based on web server and discussing a scheme for this system network by datasocket. the method of this paper can more accurately determine the syntony frequency and electric simulation network parameters of magnetostrictive transducers than the testing method of syntony & anti - syntony. at the same time, discussing virtual instrument measurement system and how to realize magnetostrictive transducer electric simulation network system by labview network functions of network virtual instrument measurement development environment

    在windowsnt系統環境和labview虛擬儀器技術開發平臺下，首次利用labview中的直線擬合模塊、指數擬合模塊以及多項式擬合模塊，設計了一種對實驗所得數據進行曲線擬合的方法，對三種擬合方法進行了比較，曲線擬合結果表明，多項式擬合方法相對于其它兩種擬合方法效果更好；根據曲線擬合的結果可從帶激勵線圈的磁致伸縮換能器的輸入阻抗中分離出磁致伸縮換能器鐵芯在無激勵電流時機械振動形成的等效輸入阻抗，並由此輸入阻抗確定了磁致伸縮換能器的諧振頻率及其電氣模擬網路參數；最後通過labview提供的網路功能，實現了基於web服務器的磁致伸縮換能器電氣模擬虛擬儀器測試系統，並探討了通過datasocket技術實現該系統網路化的方案。
  2. The paper adopted advanced rf direct digital modulation scheme

    本文採用先進的射頻直接數字調制/解調技術方案。
  3. In this paper, microwave t / r front - end for short distance wireless communication is realized in miniature based on low cost mcm - l technology. the main jobs are as follows : 1. the performances of i / q modulation and direct converter receiver are analyzed to set down the system scheme

    主要工作包括以下幾個方面: 1 .基於目前流行的數字中頻接收技術，分析了i / q調制和直接變頻接收機的性能，提出超外差變頻的總體系統方案。
  4. This dissertation adopts a universal digital ds / dmpsk modulation and demodulation scheme which is based on fpga. this scheme adopts quadrature balanceable modulation, intermediate frequency sampling, digital matched filtering, delay differential demodulation techniques and so on. it directly processes the digital signals on intermediate frequency without down - conversion, and doesn ’ t need pseudo random codes synchronization and carrier wave extraction circuits

    本文採用了一種基於fpga的通用數字調制解調方案，該方案在調制端採用了正交平衡調制技術，在解調端採用了中頻帶通采樣、數字匹配濾波、延時差分解調等技術，直接在中頻上進行數字信號處理，不需要進行下變頻，也不需要增加額外的偽隨機碼同步捕獲和載波提取電路。
  5. The theory of digital receiver working with software radio is fully developed, however, limited by the current technical level, it is difficult to realize rf signal digitalization. thus, the prevalent choice is if signal digitalization

    基於軟體無線電思想的數字化接收機理論已經相當成熟，但由於受到硬體器件發展的約束，直接對射頻信號采樣處理面臨著很大困難，因此目前通常採用中頻數字化接收方案。
  6. Aim at the development of the software radio in generalization, standardization and modularization, a waveform synthesis solution based on direct digital frequency synthesis is developed

    針對國內外軟體無線電技術對通用、標準、模塊化的硬體平臺的需求，本文提出了一種基於直接數字頻率合成原理進行信號數字域調制的波形合成器設計方案。
  7. The cutter location in nc generative ultrasonic grinding process for parallel ruled surface with cylindrical grinding wheel was analyzed, the structure of nc generative ultrasonic grinding device was introduced, the design of grinding spindle assembly and the spindle ' s driving scheme was also introduced, system hardware and software design had been finished

    摘要分析了圓柱磨輪數控展成超聲磨削平行直紋面時的刀具空間位置，介紹了數控展成超聲磨削成形加工機床的總體結構，論述了磨輪主軸部件設計及主軸驅動方案，實現了主軸變頻調速控制系統軟硬體設計。
  8. The test results demonstrated the feasible of the scheme. the technique researched in this paper will largely simplify the equipment of modulation and demodulation, and may find its application in millimeter wave in high - speed data communication link

    與中頻調制方案和一般直接射頻調制方案相比，本文所採用的技術大大簡化了調制/解調設備，同時保持了優良的性能，對毫米波高速數據通信鏈路應用具有較大的優越性和廣闊的前景。
  9. Based on the analysis of the control theory of the dtc of doubly fed induction machines, in this paper, two control schemes are proposed : the least mode of rotor current and the stator power factor adjustable mode. in the first control scheme, we may make the rotor voltage the same or opposite phase with the rotor current by throwing suitable rotor voltage vector

    在第一種控制方案中，通過施加轉子電壓矢量，使轉子電流與轉子磁鏈垂直，轉子勵磁全靠定子電流，即可保證轉子電流和轉子電壓同相或反相，從而實現了轉子側功率因數為1 ，可減小轉子側變頻器的容量。
  10. This paper goes on with analysis of the phased array radar calibration theory and compare of different schemes, then the best is adopted. 2 mhz digital circuit mainly composed of dds ( direct digital synthesis ) chip, which carries out the shift of the phase and the limit of the amplitude, has been designed and debugged successfully. it is used to substitute for the conventional phased shift circuit and amplitude limiting circuit which work at the radio frequency, so the all - digital transmit channel of phased shift array radar is achieved

    本論文研究的重點是：針對傳統相控陣雷達系統收發（ t r ）組件中的移相和限幅功能均在射頻段完成，大膽利用直接數字合成（ dds ）晶元組成頻率在2mhz左右的數字電路代替傳統相控陣雷達在射頻段進行移相和限幅的電路，從而組成全數字發射通道，使對相位和幅度的控制和調試更方便快捷，並設計具體的電路驗證此方案的可行性。
  11. The technology of direct sequence spread spectrum / code division multipul access ( dsss / cdma ) are applied in the broadband code division multiplex wireless communication systems, which means transmitting data at the rate of 2. 048mbps using four e1 lines within the band of 20mhz. in this paper, the theory of the whole debice is first analysized specified for the system asic design and optimizing its performance

    寬帶碼分復用無線傳輸系統是採用直接序列擴頻/碼分多址（ dsss / cdma ）技術，在20mhz頻帶內實現四路2 . 048mbps的e1鏈路數據速率的無線傳輸。本文首先分析了整個數傳設備實現原理，針對系統asic設計和優化整機集成性能出發，提出並實現了基於fpga控制pm4314e1晶元的介面模塊完成對e1鏈路信號的監控和告警功能的改進方案。
  12. Material recommend about the development and theory of dtc the composing of dtc - system is presented in this paper. some important taches such as flux - linkages adjuster, frequency adjuster, the mathematics model of asynchronous motor in - coordinates and the choice of voltage - vectors are discussed detailedly

    文章對直接轉矩控制方案的發展與理論做了具體介紹，根據理論確立了直接轉矩控制系統的結構組成，並對其中如磁鏈調節、頻率調節、在定子坐標系下的異步電動機數學模型、電壓向量選擇等重要環節作了詳細討論。
  13. Therefore, it has been widely used in the domains of communication, radar, navigation, etc. this article focuses on the generating of the function waves which include sine wave, triangle wave and square wave, depict the concepts of dds ( direct digital synthesis ) and surveying frequency on equal precision, analyze the key techniques in the development and present solutions of function generator. author also present the system structures of hardware and software, discuss the performance indexes and consider the possibility of the system. finally, with respect to the problems in debugging and testing process, author do some analyzing and present the practical solutions

    本文主要圍繞函數發生器輸出的正弦、三角和方波三種基本波形的產生這一課題來展開，闡述了其中的直接數字合成（ dds ） 、等精度測頻等概念;分析了研製函數發生器所需攻克的關鍵技術，提出了技術解決途徑;對方案軟體進行編制和系統進行設計、安裝調試，實現了課題功能;最後針對調試中出現的問題，進行了較深入的分析，並提出了實際的解決措施。
  14. This dissertation use rebuild of combined telemeter system, which is the subsystem of the red - nine system developed by the aerospace measure and telecommunication incorporated company, as background, study and discuss frequency synthesize technology. the mostly task is to study how to use the direct digital synthesis technology to design and realize the high speed digital mid - frequency modulator, and give the answers of the problems which emerge in the development

    本文以某測通公司研究生產的「紅九」系統中遙測模擬組合子系統為背景，對其中的數字中頻調制器的研究開發進行探討，主要任務是研究如何用直接數字合成技術進行高速數字中頻調制器的設計與實現、並提出了研發過程中所出現的問題的解決方案。
  15. The communication technology of electric automatic system is discussed. it principally studies the technology of organizing nets, the communication technology of low pressure electric line and the technology of spread spectrum communication. it gives the project that power line carrier and direct sequence spread spectrum communication are combined with automatic dial - up passing modems for daqing automatic reading meter system

    探討了電力自動抄表系統的通信技術，重點研究了組網技術，低壓電力線通信技術，擴頻通信技術，提出了在大慶電力自動抄表系統中利用公眾電話網通過數據機自動撥號、電力載波和無線直接序列擴頻通信相結合的數據傳輸方案。
  16. In order to supply the actual bpsk ds - ss signal to verify the algorithms, this dissertation present a design method of spread spectrum signal generator with adjustable muti - parameter in detail

    為了給驗證演算法提供現實的bpsk調制的直接序列擴頻信號，本文詳細介紹了一種多參數可調的擴頻信號源的設計方案。
  17. In the digital intermediate frequency project, the intermediate frequency signal is converted to digital signal directly into the dsp chip, then it is be processed by dft

    數字中頻方案將中頻信號直接通過a / d轉換後送入dsp晶元進行dft變換，最後得到待測信號頻譜的采樣序列。
  18. These parameters include bandwidth, carrier frequency, signal duration and signal repeat frequency. according to the parameters, we select the method direct reading the stored digital waveform to realize the waveform generation in the third part, the waveform generator system control including communication control, timing control and address generation is designed

    第二部分研究了線性調頻信號參數間的內在聯系，包括信號帶寬、中心頻率、持續時間及重復頻率等，設計了信號參數，並在前人研究的基礎上選擇了波形存儲直讀法作為信號產生方案。
  19. Combining the hardware and software, the real - time performance is also discussed. ( 5 ) when the system is debugged, some problems are discussed in detail and solved, such as volts d. c of the input signal caused by a / d converter and aliasing in frequency spectrum arising as re - sampling input data. experimental results show that the performance of the system is satisfactory

    （ 5 ）討論了本dsp系統的軟、硬體調試方法，並詳細地討論了在系統總體調試時，出現的各種問題? ?如a d器件引起的輸入模擬信號的直流偏置、波束形成過程中由於數據抽取引起的頻譜混疊，解釋和說明各種問題出現的原因，並提出了相應的解決方案。
  20. After comparing several analog and digital generation methods of lfm signal, this paper confirms the system scheme as direct digital synthesis plus quadrature modulation. combined with agilent arbitrary waveform generator and phasor signal generator, a generation system is established and a ultra - wideband signal, whose bandwidth is 1ghz and carrier frequency is 4ghz, is generated

    通過對幾種模擬與數字線性調頻信號的產生方法的比較，本文採用了以直接數字波形合成（ ddws ）加正交調制的系統方案，並結合實際的儀器設備，產生了帶寬為1ghz ，載頻4ghz的超寬帶線性調頻信號。
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