字頻率 的英文怎麼說
中文拼音 [zìbīnlǜ]
字頻率
英文
word frequency-
The design of digital cymometer based on vhdl
語言的數字頻率計設計Digital cymometer design based on max plus
軟體平臺設計數字頻率計Luo bin ( optics engineering ) directed by yu xuecai, zong derong based on the laser mode locking principle, this paper focuses on the study of dds acousto - optic mode locker
本文根據鎖模激光原理，進行了dds （直接數字頻率合成器）聲光鎖模器的研製。As a new development in the field of electronic oscilloscopes a hand - held digital oscilloscope is a truly integrated test tool, with digital storage oscilloscope ( dso ), multimeter and digital ondometer in one easy - to - use instrument
=手持式數字示波表是示波器技術的一個新的發展方向。通過使用大規模集成電路和液晶顯示器，它把數字存儲示波器、數字頻率計、數字萬用表組合在一個手持式儀表體內。Standard test method for impedance and absorption of acoustical materials using a tube, two microphones, and a digital frequency analysis system
管子雙擴音器和數字頻率分析系統用傳聲材料的阻抗和吸收的試驗方法Fpga and dvb standard are introduced firstly, dvb - c standard and composition of its system are analyzed completely, development of modulator structure and dvb - c digital modulator composition are presented, more over, analysis of respective modular are given. then, principle of dvb - c digital modulator system are presented, they are error control technique 、 mqam 、 nyquist rule and root raised cosine filter 、 window design method for fir filter 、 multi - rate signal processing ( integer interpolating, conversion of fractional sampling, equal conversion of net structure, polyphase structure for filter, poly - phase structure for interpolator, multi - stage implementation of samplying conversion ) 、 distrubited algorithm 、 cic filter 、 dds 、 cordic algorithm
接著，專門利用一個章節闡述了dvb - c前端調制系統原理，他們了差錯控制技術、多進制調制（ mqam ） 、 nyquist準則與平方根升餘弦濾波器、有限沖擊響應濾波器的窗函數設計法、多抽樣率信號處理包括（整數倍內插原理、分數倍抽樣率轉換、網路結構的等效結構、濾波器的多相表示、內插器的多相表示、抽樣率轉換的多級實現） 、分散式演算法、 cic濾波器、直接數字頻率合成（ dds ） 、 cordic演算法。It can dynamically determine the structure information need to index according to real query loads and opti mization of index. second, to consider the effects of structural information on result relevance ranking, this dissertation proposes a ranking algorithm that consider both the frequency distribution and structural distribution of keywords in the result, and a dynamic element - oriented method to compute the weight of keywords
第二，為考慮xml數據中的結構信息對查詢結果相關度值的影響，本文提出了一種綜合考慮關鍵字頻率分佈特徵和結構分佈特徵的查詢結果相關度演算法，以及一種基於節點的關鍵字權重計演算法，取得了更優的檢索性能。The circulation function therapeutic instrument of brain based on direct digital synthesis ( dds ) technology uses the domestic newest scientific findings and others in foreign countries. adopting the dds technology directly, it produces the safe, valid treatment. through pasting heart electric electrode on body surface, it introduces electric current to cerebral fastigial nucleus ( fn ) without damage in order to improve the state of brain blood supply and nerve conducted and something of lacking proper care to lose the symptom of coordinating with a net, increase cerebral blood flow, reduce downright bad neuron figure, district of penumbra, lighten brain perinemotoma
基於直接數字頻率合成技術的智能腦電治療儀應用國內國際上最新科研成果，採用直接數字頻率合成技術，實現安全、有效的治療，通過粘貼于體表的電極，無創引入小腦頂核，從而改善腦供血狀態和神經傳導失調失絡癥狀，增加大腦血流量，減少半影區壞死神經元數目，減輕腦水腫，最終達到改善腦循環功能的作用。Digital frequency counter
智慧型數字頻率計數器Fip digital frequency display panel
數字頻率顯示板Intelligent digital display instrument
智能計數器數字頻率轉速線速度儀表Intelligent pressure differential pressure transmitter
智能計數器數字頻率轉速線速度儀表Intelligent digital display electrical power instrument
智能計數器數字頻率轉速線速度儀表Intelligent counter digital frequency rotating speed line velocity instrument
智能計數器數字頻率轉速線速度儀表This design keep the twice frequency transform and the superheterodyne structure in analog receiver, and use programmable direct digital synthesizer ( dos ) in rf section. use this method, we can not only inherit the advantage of high sensitivity and high selection in traditional design, but also improve the automation of the equipment
該方案保留了原模擬接收機二次變頻的超外差結構，在射頻前端利用了可編程的數字頻率合成器（ dds ） ，這樣既繼承了原接收機的高靈敏度，高選擇性的優點，又提高了它的接收機自動化特性。Dfs digital frequency synthesizer
數字頻率合成器Frequency measurement by digital meter
用數字頻率計測頻The effects of frequency and productivity on character learning by elementary l2 learners from alphabetic language backgrounds
漢字頻率和構詞數對非漢字圈學生漢字學習的影響This paper include the following parts. firstly the sine exciting - voltage is guaranteed by direct digital synthesize technology ; secondly the digital output of cos ( 9 ) and sin ( 9 ) are generated by microcontroller ; thirdly the two voltage signals which are the product of the two former signals gained by the multiplying d / a converter, being filtered and amplified, have constant frequency, and one amplitude has sine function relationship of with the input angle, and the other amplitude has cosine function relationship of with the input angle ; finally the two signals are acquired and analyzed by relative instrument and software
主要由以下幾部分組成：用數字頻率合成技術（ dds ）產生正弦激勵電壓信號u _ msin （ t ） ；用單片機產生幅度的數字量輸出sin （ ）和cos （ ） ；用乘法型d a轉換器實現激勵電壓和幅度的乘積，並通過濾波器和功放后即得到頻率固定，幅值隨輸入角成正餘弦變化的電壓信號；最後用數據採集卡採集輸出信號，顯示波形並進行頻譜分析。Based on the analysis, we bring up a new way of thinking, after considering the characteristics of the dds design in software radio system platform. we adopt the rom compression technique of dds special chip and other optimizing methods in the design. we still bring up a new modified method, of which the compression ratio is 139. 6 : 1
在此理論分析基礎上，針對在軟體無線電平臺中的直接數字頻率合成設計特點，對dds專用晶元進行分析后提出新思路，將dds專用晶元中所使用的幅度表壓縮技術用於軟體無線電平臺中的dds設計，同時採用其它輔助方法進行了優化設計，並提出一種新的改進方法，將壓縮比提高到139 . 6 ： 1 ，很好的改進了軟體無線電平臺中直接數字頻率合成的雜散抑制性能。分享友人