key band 中文意思是什麼
key band
解釋
特徵譜帶-
This paper focuses on the base band process based on the core chip - csm5000 and sheds light on some key technologies
本文論述了wau中基於csm5000晶元的基帶處理系統開發，對若干關鍵技術進行了研究。 -
In the next place, by studying the change of the resonant frequency of the whole system, this paper designs the circuit to track the resonant frequency of the system by cd4046 mainly. at the same time, in order to improve the efficiency and get better dynamic capability of the converter, we choose pll and fuzzy control after comparing the pll circuit, fuzzy circuit and pll ? fuzzy control circuit. in the end, this paper brings forward the control blue print to realize the drive control circuit of the high frequency converter, using the dsp chip as the key part to realize four routes of pwm drive pulses with dead band of the control system
其次，通過對整個系統諧振頻率變化的分析和研究，設計了以鎖相環cd4046為核心的鎖相環控制電路，同時，在綜合比較鎖相環控制、模糊控制以及模糊控制和鎖相環復合控制三種控制演算法的基礎上，進行了系統模擬，得出採用復合控制可使跟蹤電路既具有鎖相環路較好的穩態性能，又擁有模糊控制較好的動態性能，系統魯棒性能好，同時也提高了逆變器的效率。 -
Mixers are the key components of many microwave and millimeter - wave systems. the super - heterodyne receiver is always applied in modern communication system, mixer becomes the key component as is at the first part of system. but it is more and more difficult to get the choiceness lo source of the same band with the system is working at high frequency especially in the millimeter - wave. sub - harmonic mixer is a good solution to this problem now. in this circuit we need just half 、 quarter 、 even 1 / 8 of the rf signal frequency. in this paper the design and fabricate of sub - harmonic hmic mixers ( 2, 4 ) at w - band are introduced
混頻器是微波通信、射電天文學、雷達、等離子物理、遙控、遙感、電子對抗，以及許多微波測量系統中至關重要的部件。在現代通信系統中，毫米波頻段通常採用超外差接收機，混頻器作為第一級就成為關鍵部件。由於在毫米波頻段，同頻段高性能的本振源成本高，技術難度大，採用分諧波混頻技術是解決此問題的有效途徑，只需射頻頻率1 / 2 、 1 / 4甚至1 / 8的本振頻率即可實現混頻。 -
After elaborating the principle of an 802. lib key modulation scheme - complementary code keying ( cck ), this paper proposes and realizes a hardware circuit solution of 802. 11b pcmcia wlan interface card, which can reliably offer a maximal 11mbps data rate and freely switch within 14 working channels in 2. 4ghz frequency band
接著在詳細闡述了802 . 11b協議核心調制技術?互補碼鍵控（ cck ）的原理的基礎上，本文提出並實現了一種峰值傳輸速率為11mbps的802 . 11bpcmcia高速無線網卡的硬體電路設計方案，在2 . 4ghz頻段該網卡可在14個工作通道上自動切換，實現高速突發數據的可靠傳輸。 -
The major job is manufactured a transmitter, which has three upmixer channels. its function is to up convert the signals from c - band to ka - band. the input local oscillator is provided by a low frequency crystal oscillator which has a good performance of phase noise, through 512 times multiply to ka band. this sysetem is used in the laboratory as transmitter source of the fuze, for the multidimensional objects in practise, which lead to the complexity of the reflect signal, so the amplitude, frequency and the phase of the transmit signals both have a key role in dealing with the reflection signals. therefore, this system requires for both the coherence of the single channel ’ s amplitude, phase and multi channels
本文的主要工作是應用戶要求製作一具有三發射通道的上變頻系統，可以將c波段的微波信號上變頻到ka波段的毫米波信號。系統的本振輸入基頻由一相位噪聲非常好的低頻率晶振提供，經過512次的倍頻放大至ka波段。本系統作為實驗室中引信的發射源，由於目標反射信號具有時變的多維性，反射信號變得極為復雜，在信號處理時，不僅信號幅值、頻率有決定意義而且相位關系也很有決定意義。 -
The laser acquisition, pointing and tracking ( apt ) technology of high precision and large band - width is the key technology of space laser communication
高精度、寬帶寬的激光捕獲、對準和跟蹤技術（簡稱apt ）是空間激光通信的一個關鍵技術。 -
One of the key technologies of deep space communication is channel code. there are differences between deep space communication and the common space communication. because the former one has some characteristics, such as extending information transmission, and seriously reducing signal energy, it is necessary to ensure the information transmission band and the exactness by using the special means
通道編譯碼是深空通信中的關鍵技術之一，深空通信與一般的空間通信不同，深空通信具有信息傳輸時延大、信號能量衰減嚴重等特點，必須有特殊的手段保證其信息傳輸的帶寬和準確。 -
Large time - band product signals such as linear frequency modulation signals ( lfm ), nonlinear frequency modulation signals ( nlfm ), phase coded signals and so on are one of key technologies for pulse compression radar systems
具有大時寬帶寬積的信號，如線性調頻信號、非線性調頻信號、相位編碼信號等是雷達應用脈沖壓縮技術的關鍵之一。 -
Bringing into play the communication market resources in hangzhou bay, the park devotes itself to the formation of a “ mobile valley ”, which means a unique zhejiang - flavored economic pattern : forming a complete telecommunication industry chain from software and operation development of key parts, such as ic chip, rf modules, base band, display, high capacity battery, to related components like cell phone housing, keypad, antenna, vibration motor, mould, pcb ( circuit board ), photoelectricity device, electronic device, connectors and system and software development, and operation service development
園區依託杭州灣通信市場資源，致力打造「移動谷」 ，創造中國浙江經濟特有的專業版塊模式：從集成電路晶元、 rf組件、基帶、顯示器、高能電池等核心器件到接手機外殼和按鍵、天線、振動馬達、模具、 pcb （電路板） 、光電器件、電子器件、連接件等相關組件及系統和軟體開發、運營服務開發，形成完整的通信產業鏈。 -
Passing the shared secret around can become a potential liability : the shared secret can be exchanged out of band, or the shared secret itself may be encrypted using another key
傳遞共享密鑰可能成為潛在的缺陷：共享密鑰可以通過不同的方式交換，或者共享密鑰本身使用其他密鑰加密。 -
In this article, we introduce the mode of " gsr + l3 + ma " to construct broad - band ip man via ethernet technology. in order to achieve a manageable man, we analyzed and solved several key issue, such as routing layout ip address distributing customer accessing authentication and accounting vlan applying the robust network quality of service network security network administration, etc. i have participated in longyan man construction
本文利用以太網技術，採用「線速路由器gsr +路由交換機l3 +多業務接入設備ma 」的組網模式，通過分析並解決了路由規劃、 ip地址分配、業務接入、認證與計費方式、 vlan運用、網路的魯棒性（ robust ） 、服務質量（ qos ） 、網路安全、網路管理等關鍵問題，建設可運營、可管理的寬帶ip城域網。 -
As the key component of multiplexer / demultiplexer, optical filter technology has been fueling great interest with the emergence of wide range tunable laser source, all - wave fiber, and wide band optical amplifiers, which is promoting dwdm to a leading edge of optical fiber communication
隨著寬可調諧激光光源、全波光纖和超寬帶光放大器的出現，密集波分復用日益成為光纖通信的主流技術，作為復用/解復用器核心的光濾波技術備受關注。 -
Software design firstly introduces sof tware development environment and the task of software design for dsp based hydraulicturbine speed governor. then it gives several key subprogram, including frequency measuring, a / d convert, pwm output with a dead band, lcd display
軟體部分首先介紹了軟體開發的環境及要完成的任務，給出了測頻子程序、 a d轉換子程序、帶死區pwm輸齣子程序、液晶顯示子程序的設計及部分程序代碼。 -
The key purpose of the subject is in order to validate the feasibility of dds / pll in the spreading band
其主要目的是驗證dds / pll在頻帶擴展方面的可行性。 -
In this paper, the extension theory of bandwidth in digital system and three key points of frequency band extension technology are studied experimentally by simulation
本文主要研究了數字系統頻帶展寬原理及頻帶展寬中的三個關鍵技術。 -
We summarized three key points of frequency band extension technology and systematic studied these points by simulation. an experiment executing frequency band extension for a concrete digital measurement system was performed
最後，我們對數字系統頻帶展寬技術中三項關鍵技術的綜合模擬，並針對一個具體數字系統實施頻帶展寬進行了實驗。 -
Firstly, the differences between a qpsk system and a tcm - 8psk system, and the difficulties in the latter ’ s realization are considered in detail, including the frequency band utility, the group delay effects, the filters ’ implementation, the base band processing and some key technologies
首先考慮了tcm - 8psk系統與傳統的qpsk系統的不同，以及在實際工程中會遇到的一些困難。包括從整個系統方面考慮的帶寬利用率問題、群延遲問題、濾波器問題和基帶處理等問題，以及實現這樣一個系統的幾種關鍵技術。 -
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。 -
In modern microwave and millimeter wave communication systems, the low phase noise frequency sources have the key effects in the systems ’ performance. especially in the national defence, the effects are more obvious. so in this paper, a method to realize the low phase noise x - band frequency source has been proposed, designed, produced and tested
在現代微波、毫米波通信系統中，低相噪頻率源對系統性能起著非常關鍵的作用，特別是在軍事國防上，這種關鍵的作用更加明顯，為此在本論文中，就如何實現x波段頻率源的低相噪性能，給出了一種設計方法並對其進行了實現。 -
To the solution of how to further shenzhen " s development of hi - tech industry, i point out in my thesis as follows, to accelerate the strategy of relying on science and education to develop the city ; to develop electronic information technology, biological technology and new material technology, with hi - tech industry band as carrier and highlighting invention of system, technology and management ; to build some key hi - tech enterprises and well - known products ; to promote industrial upgrading ; to informationize with strength ; to attract elites ; to protect copy right ; to keep an eye on the risk of investment ; to better the investment environment ; to make shenzhen the base of production and exportation of hi - tech product, the base of hi - tech research and development, the base of transformation and transaction of its outcome, as well as the base of fostering hi - tech elites ; to try to make shenzhen a hi - tech city with clear scale advantage, outstanding industrial features, creation and investment in full bloom, lots of hi - tech elites and pleasant environment
對深圳如何進一步發展高新技術產業的對策問題，我在論文中提出：加武漢理工大學碩士學位論文快實施科教興市戰略，以高新技術產業帶為主要載體，突出體制創新、技術創新和管理創新，重點發展電子信息、生物技術和新材料技術，培育一批高新技術骨幹企業和名牌產品，用高新技術改造和提升傳統產業，推動產業升級，加強信息化建設，吸引創業人才，保護知識產權，防範投資風險，優化創業環境，使深圳成為重要的高新技術產品生產和出口基地，高新技術研發和成果轉化、交易基地，以及高新技術人才培養基地，努力把深圳建設成為規模優勢明顯、產業特色突出、創新體系完善、創業投資活躍、科技人才薈萃、綜合環境優良的高科技城市。
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