極低頻帶 的英文怎麼說
中文拼音 [jídībīndài]
極低頻帶
英文
extremely low frequency band-
An omnidirectional ultra - wideband monopole antenna, with the characteristics of simple structure, easy fabrication and low cost, mainly comprises a ground plane, a u - shaped radiating member above the ground plane and a feeding member
一種可提供超寬頻操作頻帶之全向性超寬頻單極天線，其具有結構簡單、製作簡單以及成本低廉的特性。It takes to you the integrity during complete wonder, the high school low frequency all processes qia arrives the advantage, has not exploded the tendency, actually has extremely richly, extremely has elastically low frequency, moreover is in no way muddy, regardless of from selects a song arrange which, dubs in music, also perhaps is high, center, the low frequency technical utilization, again perhaps the prelude, plays the rhythm which, the tail plays, in abundantly picks in the audiences long foundation all has the unprecedented innovation
它帶給你完整無缺的美妙，高中低頻均處理得洽到好處，沒有膨爆的動態，卻有極其豐富，極具彈性的低頻，而且決不混濁，無論從選曲、配樂的編配，亦或是高、中、低頻的技術運用，再或是前奏、間奏、尾奏的韻律，在博採眾長的基礎上都有前所未有的創新。Many technologies of electrically small antennas and wide band antennas are discussed in theory, simulation and experiment. and some novel electrically small or wide band antennas are proposed. the loaded monopole is analyzed in depth integrating the genetic algorithm ( ga ) with the method of moments ( mom ) in order to increase the gain and decrease the vswr of antennas used at hf / vhf band
在本論文的研究過程中，通過合理利用各種現有的天線寬帶化和小型化的理論成果、有效的綜合各種技術措施，運用矩量法和遺傳優化演算法等數值方法，深入研究了加載單極子天線問題，旨在全面提高高頻/甚高頻頻段內的天線增益和降低電壓駐波比，以獲得較高增益的、基本滿足駐波要求的小型超寬帶天線。Electromagnetic compatibility - limits - guide to signalling on low - voltage electrical installations - emission levels, frequency bands and electromagnetic disturbance levels
電磁兼容性.第3部分:極限.第8節:低壓電氣設備信號傳輸指南.輻射級頻帶和電磁干擾級別Connectors with assessed quality for use in d. c., low - frequency analogue and in digital high speed data applications. part 4 : printed board connectors. section 102 : detail specification for two - part single - pole connectors, for multiple uses on plug - in units, with pre - centring, coding and early mating features, having a metric grid in accordance with iec 60917
經質量評估的直流低頻模擬和數字高速數據設備用連接器.第4部分:印刷電路板連接器.第102節:帶前定心編碼和預配合部件的符合iec 60917的公制柵格多用途插件用雙部分單極連接器的祥細規范Connectors with assessed quality, for use in d. c., low - frequency analogue and in digital high speed data applications - printed board connectors - detail specification for two - part single - pole connectors, for multiple uses on plug - in units, with pre - centring, coding and early mating features, having a metric grid in accordance with iec 60917
直流低頻率模擬及高速數字數據系統用已經過過質量評定的連接器.第4部分:印製電路板聯接器.第102節:帶前定心編碼和預配合部件的米制多用途插件用雙部分單極聯接器的詳細規范Connectors with assessed quality for use in d. c., low - frequency analogue and in digital high speed data applications - part 4 : printed board connectors - section 102 : detail specification for two - part single - pole connectors, for multiple uses on plug - in units, with pre - centring, coding and early mating features, having a metric grid in accordance with iec 60917
直流低頻率模擬及高速數據數字系統用已進行過質量評定的連接器.第4部分:印製電路板聯接器.第102節:帶前定心，編碼和預配合部件的米制多用途插件用雙部分單極聯接器的祥細規格In term of bandwidth fluctuation of internet, proposes two types of scalable video coding scheme adapted to transmission of internet, that is, a fine - granularity spatially scalable video coding and a progressive fine - granularity scalable video coding. meanwhile, proposes a wavelet transform ' s algorithm using for lower rate coding
同時針對internet上傳輸帶寬波動性，提出了兩種可用於internet傳輸的可伸縮視頻編碼方案- - fgss （精細空間可伸縮視頻編碼）和pfgs （漸進精細可伸縮視頻編碼） ，提出了用於極低碼率的小波變換編碼演算法。Comparing to inducing - magnetic mode with 50hz alternating current, we can use lower frequency alternating current to induce the magnetic so that it can eliminate the noise at 50hz frequency and weaken the noise whose phase lags signal 90 ? greatly. comparing to inducing - magnetic mode using rectangle - wave current as the signal, using low frequency to induce magnetic can eliminate ( weaken ) the differential coefficient noise. thirdly, it eliminates or weakens all different noise by designing the circuitry effectively in the transforming signal part
相對於50hz交流勵磁，這種勵磁方法可以採用更低的頻率來對微流量的磁路進行勵磁，一方面可以完全消除工頻干擾，另一方面可以極大地減小正交干擾；相對于方波勵磁，這種勵磁方法相當于多值方波勵磁，有利於消除或減少方波法勵磁所帶來的微分干擾。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。But they have the disadvantages such as poor complexity, poor security and insufficient amount of sequence numbers among the family of codes, the chaotic signals have noise ? ike, broadband frequency spectrum, they can be used as spreading codes, furthermore, chaos system is extremely sensitive on initial conditions so that the various initial conditions given by chaos system can provide with large sum of spreading sequences and this can meet the demand of cdma, this thesis sets out to study on using chaos system to generate spreading sequence s, there are two parts is this paper : firstly, we study the basic theory of spread ? pectrum communication and the characteristics of chaos so as to prove the applicability of chaos system to be used in spread ? pectrum ii communication system
現在使用的擴頻碼有m序列， gold碼和r - s碼等，這些擴頻碼具有良好的隨機性，但普遍存在著復雜度低、保密性差以及同一碼族序列數目少等缺點。混沌信號具有類似噪聲、寬帶連續頻譜的特徵，正符合擴頻通信中對擴頻碼的要求，而且混沌系統對初始值極其敏感，可以通過給混沌系統賦予不同的初始值得到為數眾多、不相關的擴頻序列，這正好滿足碼分多址的要求。本文對利用混沌系統應用於擴頻通信作了一些研究工作，主要包括兩部分：第一部分：探討了擴頻通信的基本理論和混沌的基本特性，說明將混沌系統應用於擴頻通信系統的可行性。This is because the bpf is a two - pole filter ; at its cut - off frequency ( when output is 50 per cent ) the output power of a true lpf of the same cut - off would be in fact 70. 7 per cent
這是因為帶通濾波器是一個兩極濾波器；在其截止頻率下（輸出為50 % ） ，真正的具有相同截止頻率的低通慮波器的輸出功率事實上為70 . 7 % 。Connectors for use in d. c., low frequency analogue and digital high speed data applications - part 4 - 104 : printed board connectors with assessed quality - detail specification for two - part modular connectors, basic grid of 2, 0 mm, with terminations on an multiple grid of 0, 5 mm
直流電用的低頻模擬和數字高速應用的連接器.第4 - 104部分:已評估質量的印製板連接器.兩部分調模器連接器的詳細規范.帶有在0 ， 5mm多重柵極終端的2 . 0mm基本柵極分享友人