換頻傳信 的英文怎麼說
中文拼音 [huànbīnzhuànxìn]
換頻傳信
英文
frequency change signaling-
Mems ( micro electromechanical system ) has become one of the most rapidly development technologies. along with the rapid development of mems techniques, capacitive sensor is used widely whose capacitance changes small, which has put forward the new request to the measurement technique. the common measure for capacitance measurement is that convert capacitance to voltage, electric current or frequency. the area of polar plate of the capacitor becomes smaller and smaller, and the total capacitance of micro capacitive sensor is usually several pico farad only. as a result, its change amount is smaller
Mems （ microelectromechanicalsystem ）近年來發展最快的技術之一，隨著mems技術的快速發展，電容式加速度計的電容變化變化量越來越小，對檢測技術提出了新的要求。在電容式傳感器中，常用電容檢測電路是將其轉換為電壓、電流或者頻率信號。目前的微型電容傳感器的極板面積變得越來越小，電容總量只有幾個pf ，變化量就更小。In all kinds of complicated network, oriented linking and unlinking, communication frequency resource is strained, and bandwith to transmitting audio frequency signal is too restricted, complicated and fluky, while audio frequency data exponential have been increased in the last several years. under the circumstances, based on the research of predecessor, this paper studies wavelet analysis ' s maths gist and practices significance on signal process, and puts forward a optimized wavelet package condensation arithmetic to process audio frequency data, which gives attention to coding efficiency, multirate and compression delay. simulation experiment on the arithmetic has been done by matlab
針對無連接和面向連接的各種復雜網路環境下，通信頻帶資源緊張，音頻傳輸帶寬有限且復雜多變，而各種音頻數據又日益增多的局面，本文研究小波分析在信號處理方面的數學依據和在數據壓縮方面的實際意義，在前人不斷工作的基礎上，提出了一種優化小波包變換編碼方案用於音頻數據的壓縮演算法，兼考慮了編碼效率、多碼率和壓縮時延多個方面，並在matlab環境下做了模擬實驗，對各種音頻信號及多種小波函數做了模擬結果比較，實驗結果證明該演算法可以在一定計算復雜度下可以很好地改進壓縮效果，達到多碼率下實現實時編解碼的過程，在高速dsp晶元等硬體設備支持下，可以有效應用於實際復雜多變信源編碼。It designed signal amplifying circuit, frequency tricking circuit, data sampling and keeping circuit. the choice of 12 bits high accuracy a / d integrated data sampling card made program simply, high flexible and expandable. and to each error which is likely to occur in high voltage capacity type equipment during the monitoring, analysis and judgement are given
在硬體電路實現上，注意選擇信號傳感器；合理設計了信號放大電路和濾波電路；設計了頻率跟蹤電路，數據采樣/保持電路；結合軟體控制選用了12位高精度的a / d轉換器，使軟體編程簡化且具有較高的靈和性和可擴展性。This paper researches and analyses the developments of web technology and magnetostrictive transducers from world wide region. the paper also analyes the characteristics curve of magnetostrictive transducers based on its equivalent circuit and researches the method how to make sure its syntony frequency and its electric simulation network parameters. at the same time, by using jsp technology, a magnetostrictive transducer electric simulation application is designed based on b / s three - tier system structure. the experiment data is fitted by curve fitting module. the equivalent input impedance of it with stimulate loop is separated based on the results of curve fitting and the syntony frequency and electric simulation network parameters of magnetostrictive transducers is determined by the input impedance. the method presented in this paper can determine the syntony frequency and electric simulation network parameters of magnetostrictive transducers with a better accuracy than the testing method of syntony & anti - synton y. further more, jsp, the advanced technology at current, has been used to realize a magnetostrictive transducer web electric simulation system. the system has good human computer interface and the function of resource sharing and information publishing. the research of this paper and its achievements have some practical merits in the researchful and applied fields of magnetostrictive transducer
用java編程語言編寫的曲線擬合模塊，對輸入的實驗數據進行了最小二乘法的曲線擬合；根據曲線擬合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由機械振動形成的等效輸入阻抗，並由此輸入阻抗確定磁致伸縮換能器的諧振頻率及電氣模擬網路參數。本課題提出的方法與傳統的諧振?反諧振法相比，能更準確地確定磁致伸縮換能器的諧振頻率及其電氣網路參數。同時，採用當前比較先進的web技術，實現了基於jsp的磁致伸縮換能器web電氣模擬系統，該系統具有良好的人機界面和資源共享、信息發布功能。At first some modification is made in conventional beam forming of frequency domain, namely to estimate doa by arrays outputs on compensated spacial frequency points of echoes. then the cwt is utilized to signal processing in space - frequency domain for estimation of doa, and the corresponding modification is also made. in the dissertation, the computer simulations of doa estimation for both narrow - band and wide - band echoes are given, so do the necessary comparison among several methods and crb
首先在傳統的頻域波束形成演算法的基礎上，提出對寬帶信號的頻率補償，也即對寬帶回波信號的各空間頻率根據時間頻率的差異進行相應補償，然後對各陣元輸出求和來得到方位估計；其次將連續小波變換引入到空間?頻率處理中，從而完成對目標方位的估計，並進行了相應地補償。It can provide many functions : the conversion between transfer formats, the conversion between communication protocols, the conversion between analog signals and digital signals, the conversion of control commands, real time audio code / decode, ip call control, control of rtp / rtcp, call detail logs, accounting and some of gatekeeper ' s functions such as address tansfer / search.
它提供以下功能：傳輸格式間的轉換，通信規程間的轉換，音頻、數據格式轉換，呼叫控制信令的轉換，對pstn的呼叫控制功能， pstn電路交換功能，實時語音處理語音壓縮功能， ip網路呼叫控制功能，對實時對話協議rtp rtcp的控制功能，呼叫日誌，計費功能，還包括關守的地址翻譯搜索等功能。Eddy - current sensor conversion circuit consist amplification circuit, band - pass filter circuit, demodulation circuit, differentiation phase and data sampling circuit. these circuits are used to convert the test signal of eddy - current sensor to discrete signal tend to process. the microprocessor system that formed of dsp chip is used to data fitting of test system, data displaying and data communicating with personal computer, etc. the interference questions of hardware design and the measure of eliminating interference signal in the subject are introduced in the last of this chapter
硬體電路的設計主要分三大部分來實現：激勵源電路部分，由分頻電路和頻率合成電路組成，產生頻率穩定的激勵信號以確保檢測任務的正常進行；傳感器變換電路部分，由放大電路、濾波電路、檢波電路、鑒相電路和數據採集電路組成，主要將電渦流傳感器檢測線圈檢測到的信號變換成只含有被測信息的離散信號，易於后續電路處理；由dsp晶元構成的微處理系統，主要完成檢測系統的數據擬合、顯示及與主機通信等功能。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。Arithmetic figure that new dvd that conduct and actions world the adoption arithmetic figure of the first style see the port dvi port to broadcast, three stars the dvd - hd938 to can output to have not yet the compression to see the signal, but have no to need to pass by few molds the conversion process, from but avoided the loss of the painting quality with lose true, deliver the real arithmetic figure signal to television the dvi port is a high take the ieee1394 port breadth port, its deliver the speed to attain 5 gbps, is more than ten times to deliver the speed. at the same time, need not proceeding of port of adoption dvi few mold conversion, can avoid to convert what process result in to lose true, from but real realizes the arithmetic figure deliver
作為世界第一款採用數字視頻埠dvi埠的新型dvd播放器，三星dvd - hd938能夠輸出未經壓縮的數字視頻信號，而無需經過數模轉換過程，從而避免了畫質的損失和失真，向電視傳輸真正的數字信號dvi埠是一種高帶寬的埠，其傳輸速度達到5gbps ，是ieee1394埠傳輸速度的十幾倍。同時，採用dvi埠不用進行數模轉換，可以避免轉化過程造成的失真，從而真正實現了數字傳輸。In light of the limitation of fast fourier transform ( fft ) for the method of traditional spectrum analysis to analyze the unsteady signal, wavelet and wavelet analysis are made for the typical unsteady process signal of starting up and shut down with the good characteristic of simultaneous localization in both the time and the frequency domains based on the field test on the vibration of two - row placed units in lijiaxia hydropower station, in which the signal is decomposed into different frequency band, and then the weak signal is caught and the dominant frequency is picked up for the analysis of the vibration source
摘要基於李家峽水電站雙排機組振動的現場試驗研究，並且針對傳統頻譜分析方法傅立葉變換（ fft ）對于非平穩信號已力不從心這一缺陷，利用小波分析方法在時域和頻域上同時具有良好的局部化性質，通過對開停機這一典型非平穩過程信號進行小波及小波包分析，將其分解到不同頻帶內，獲取微弱信息和提取優勢頻率，並對其作振源分析，得出開停機初始時刻因水流不穩均出現強烈的振動現象，且低頻段信號能量最大，開停機過程水流脈動壓力和尾水渦帶擺動是引起定子基礎振動的主要原因。By mail, fax or telephone, dongying dongri electric co., ltd. conveys further information on some subsections, like frequency changer, expert and expert
該企業竭誠為貴公司介紹關于頻率變換器、傳感器、專家、顧問以及老練的、有經驗的和專家費用信息，請撥打+ 86 （ 546 ） 8182410 ， 81 。Hdmi series is specially used to switch, distribute, convert and transmit hdmi signal with digital high definition.
Hdmi信號hdmi信號系列產品是用於將數字高清hdmi信號視頻音頻控制信息進行切換分配轉換和傳輸的設備。The analogy video real - time capturing, encoding, compressing and streaming transfer have been implemented at server end by utilizing windows media encoder sdk to program. the communication between client and server is built by programming with socket. accessing the server, the client can control the video - matrix - control remotely and distributively and real - time reappear the live video
圍繞系統的設計和實現，深入分析了視頻矩陣切換器，實現了視頻通信服務器與視頻矩陣切換器的互聯；運用windowsmediaencodersdk編程實現了服務器對模擬監控視頻的實時採集、壓縮編碼和流式傳輸；運用socket編程實現了客戶端和服務器端的通信，通過訪問服務器，客戶端實現了對視頻矩陣切換器的遠程分散式控制和現場監控視頻的實時再現。The liguo av matrix switchers are designed for applications that specially switch and distribute the audio. . .
視音頻系列用於對視頻信號和音頻信號包括平衡立體聲或非平衡立體聲音頻信號進行切換分配轉換和傳輸。 .The up converter receives at its input the if signal coming from the modulator and converts it on the rf transmission channel
上轉換器在它的來自調節器的輸入if信號上接收和在射頻傳輸頻道上轉換。Nowadays, with the appearance of lots of numerical control equipments and development of information technology, there are many important changes in model of shipbuilding, a remarkable one is that exchange of data for shipbuilding becomes mor and more frequently and the amount of data for exchange also increases rapidly. at the same time, more and more digital information is required to be numbered, and then, it is digital information that is transmitted between numerical control equipment, this model bring about remarkable increasment of productivity
隨著信息技術的廣泛運用和大量數控設備的出現，現在造船模式較之以往已經產生了重大的變化，集中表現在生產數據的交換量空前龐大和交換頻率的增加，大量的生產加工信息都需要數據化處然後由數據信息在數控設備之間傳遞，這種模式帶來了生產效率的大大提高。Science and technology develops rapidly in the 21 th century, especially technologies of computer, communication and internet, the audio - visual information technology makes people exchange, search and transfer information more efficienctly, which is the perfect work of digital coding technology
隨著科學技術，特別是計算機技術、通信技術和internet網路的飛速發展，無庸置疑，視聽信息成為人們迫切需求的主流信息，在視音頻數據內容的檢索、交換和傳遞等過程中，時刻都要應用數字編碼技術。As the information era proceeds, highly developed digital image processing technique and communication technique make multimedia communication possible, and it is now on the way of progress. video conference have received more attention as an example of multimedia. in this paper we first describe the construction and characteristic of the video conference system and analyze the theory of protocol with itu - t h. 323 recommendation which inculde video and audio codec standard, communication control protocol h. 245. call signalling protocol h. 225, as well as procedures within these protocols define how these components communicate. also an experimental video conferencing system is designed and some relating key technologies are studied, which include multithread programming, transmission technology, mcu technology, qos mechanism and so on. especially, a video codec based on h. 263 recommendation with high fram rate as well as high compression ratio is researched and implemented because of importance of video application, which solves the bad image reconstrction quality problem existed in the most present video systems that adopt h. 261 video compression algorithm. by using these technologies. a video conferencing system is implemented based on lan. the system that the paper provides is easy to implement and the results of exmperiment is good. such system can be widely used in the fields such as business conference, distance education etc. and it is of good practical value
隨著信息時代的前進，數字圖像處理技術和通信技術的高度發展，多媒體通信已成為可能並已初具規模，視頻會議作為它的一個具體應用實例受到普遍關注。本文首先對國際電信聯盟itu - t制定的基於分組交換的多媒體通信h . 323系列建議進行了闡述，其中包括ip網路視頻會議系統的結構組成、視頻傳輸標準、音頻傳輸標準、系統的信息碼流、通信控制協議h . 245和呼叫信令協議h . 225以及會議系統的進行過程。在此基礎上給出了ip視頻會議的實現的整體框架，為系統的軟體實現進行了模塊的劃分和整體設計，分析了各個模塊的功能、作用。Traditional vlsi cad system is focus on single designer, designers using such system have trouble in sharing design data with other designers and need much more modification, product design cycle is long. such system can not adapt to network times in product innovation and development. while cad system in distributing co - design enviroment can get over traditional barriers, it ' s compositive, parellel, systemic and harmonious
傳統vlsicad系統以單一設計者為開發中心，設計者之間數據交換困難，信息共享性差，信息流動阻塞，產品設計周期長，修改頻繁，已不能適應網路時代產品的創新和開發。而分散式協同設計環境下的cad系統能突破傳統cad系統的不足，是集成性、并行性、系統性和協調性的統一。This paper is described wavelet transform theory, mother wavelet choice, the method to filter signal by wavelet transform and the result, prospered a way to extract feature originated from wavelet theory, which using wavelet packet analyzing method to subdivide signal both in low frequency and high frequency field, and consider energy of every layer as feature in frequency field, and in conjunction with the detailed analyzing character of wavelet packet in time - frequency plane, consider several minimum or maximum points in the lowest frequency band a s features in the time field
本文介紹了小波變換的理論、基小波的選擇和利用小波變換進行信號濾波的方法和濾波處理結果，並提出了一種基於小波理論的新的特徵值提取方法。即利用小波包分析方法將信號在低頻、高頻段作進一步的細分，以各層分解的能量作為信號的頻域特徵值，以最低頻帶的極值點作為時域特徵值，這樣的特徵值選取方法較全面的反映了信號的時-頻特徵，優于傳統的傅里葉分析方法。分享友人