frequency detection 中文意思是什麼
frequency detection
解釋
頻率檢波-
An electromagnetic wave of audio frequency produced by atmospheric disturbances such as lightning, having a characteristically decreasing frequency responsible for a whistling sound of descending pitch in detection equipment
嘯聲干擾一種由於諸如閃電等大氣干擾而產生的音頻電磁波，具有典型的逐漸減弱頻率的特徵，該頻減引起了檢波設備中調逐漸下降的嘯聲 -
Based on the analysis of the beat frequency signal, the expression of the beat frequency phase is deduced. the expression indicates physics meanings of quantities to be detected and supplies theoretical bases for detection methods. by using two - dimensional fft, the range and velocity information of target is got out from the echo. according to the periodicity range ambiguity of symmetrical pulses in fmpcw, the processing method of sliding time window is used
通過對差頻信號進行的分析，得出了差頻相位的具體表達式，表現出了要檢測的各量的物理意義，對檢測的方法提供了理論依據。利用二維fft方法，可以有效地提取回波中目標的距離與速度信息。對于fmpcw信號由於均勻脈沖產生的周期性距離模糊的問題，採取時間波門的處理方法。 -
Finally, this thesis discussed these following questions : first, the algorithm of used the error image for improving the purpose of the edge detection. secondly, we have transformed the solved question of the first and the second directional derivative to frequency domain and founded they have a single formulae in frequency domain. thirdly, we have described the singular signal and the noise by using the correlations of the neighbor data after wavelet transform
最後，在傳統的邊緣檢測演算法和小波分析的邊緣檢測演算法之外，對以下幾個方面也進行了一些討論： 1 ）利用誤差圖像來提高邊緣檢測效果的演算法； 2 ）將求解任意方向的一階、二階方向導數的問題轉換到頻域中去求解，發現在頻域中它們具有簡單易用的公式，使得原來求解任意方向的一階、二階導數的比較困難的問題變得容易實現了。 -
By its multi - solution idea, we can focalize discretionary detail of detection of cable - stayed bridge and process in time field and frequency field
利用小波分析的多解析度分析思想，可以聚焦到信號的任意細節進行時頻域處理，適合斜拉橋振動狀態的監測。 -
To the principle of single - station high - frequency ground wave detection radar, simple pulse wave was chosen, but this wave has many limitations, so continuous signal wave was preferred
從雷達信號波形選擇來看，對于單站高頻地波超視距雷達體制，最初採用簡單脈沖波形。但這種波形存在著許多缺點，最終採用連續波信號體制。 -
The materials as explant in transformation come from birch leaf, stem segment and leaf stalk, and the spider toxin gene was used as foreign gene for this transformation experiment. it showed that the best explant was the big leaf, on which the transformation frequency was 22 %. by gus detection, there were 43 percent of the plants with kanamycin resistance, and 100 percent of positive result, by pcr amplification, was gotten from random sampling
利用雙元載體的根癌農桿菌lba4404菌株（ agrobacteriumtumefaciens ） ，含質粒pyhy （目的基因及npt 、 gus基因） ，對白樺試管苗莖段，葉柄，葉片三種外植體進行侵染，結果表明：大葉片生長勢強，為轉基因的最優外植體，轉化率能夠達到22 。 -
There are the production lines established of intermediate - frequency melting, silicasol shuck, precision casting and metal ceramic, and 250 universal devices suck asvacuum melting electric furnaces, high - temperature and intermediate - temperature heat treatment electric furnaces, digitai - control lathes, milling and drilling machines, coreless millers, spherical surface millers, standing milling machines and so on, lt has established the central measuring roomm physicallab, chemical lab, metallic phase lab, crack detection test lab, seat ring lab, rocker lab and ducgt trestle lab, our esported gas engine valve seat to america was rewarded the second prize in terms of sichuan high - quality product
建有中頻熔煉真空熔煉硅膠溶模精密鑄造粉末冶金生產線。有中頻電爐真空熔練電爐高中溫熱處理電爐數控車床鉆銑床無芯磨外園磨立磨等通用設備250臺套。有中心計量室物理化學金相探傷檢測及座圈搖臂導管臺架實驗室。 -
Moving target detection algorithm in 2d frequency domain
二維頻域內的運動目標檢測方法 -
Clinical observation and nursing of radio frequency heat cure on myoma of uterus with b - ultrasonographic detection
超監測下射頻熱凝治療子宮肌瘤的臨床觀察與護理 -
The major researches in this thesis include : applying the digital signal processing technology and theory of signal detection & estimation to estimate carrier frequency of the sensing signal that reflects the measurand ; implementing the algorithm in labview, a virtual instrument development platform
本文的主要研究內容是：運用數字信號處理技術和信號檢測、估計的基本原理從無源、無線saw諧振器型傳感器的傳感輸出信號中提取出反映被測量的信號主頻，並在虛擬儀器軟體開發平臺labview上實現了測量演算法。 -
At present, the typic harmful current detection methods are the fast fourier transform algorithm in frequency domain and methods based on the instantaneous reactive power theory, these methods all require some transform and quick, real - time calculating, so high precision analog multipliers or high speed dsp chip with fast a / d are needed, this results in complex circuit and high cost ， which have restricted the development of apf
目前畸變電流檢測常用的方法有頻域法的fft和基於瞬時無功理論的畸變電流檢測法。這些方法均有一定的變換，需要快速、實時運算，因此必須使用高速的數字微處理器和高性能a / d轉換器，這必將大大提高系統成本，使得電路結構復雜，在一定程度上限制了有源濾波器的發展。 -
As an example, the detection problem of noise frequency modulation jamming signal was analyzed, two accumulation detection methods, direct accumulation detection and binary accumulation deteceion, were proposed, and the detection probability of the two methods was calculated
摘要以噪聲調頻干擾為例，對干擾信號的檢測問題進行了分析，提出直接積累檢測和二進制積累的檢測方法，並計算了兩種方法的檢測概率。 -
Section ii describes the design approach and implementation of speech module on mcf5249 coldfire core. the speech codec optimizes g. 729a codes and added voice activity detection of g. 729b to save bandwidth ; the implementation of acoustic echo cancellation uses nlms algorithm and it can reduce echo though designing adaptive fir filter and speech detector ; the dtmf and cpt generate signal using two second order digital sinusoidal oscillators and detect signal by picking up the frequency information. but only get the frequency information is not enough in cpt detector, this thesis introduces a method
其中對語音編解碼器的設計採用優化g . 729a代碼達到設計要求，並在此基礎上加入g . 729b的靜音檢測模塊，以進一步降低網路傳輸帶寬;對回聲消除器的設計採用nlms演算法，通過設計自適應fir濾波器和語音檢測器達到回聲消除目的;對雙音多頻設計，信號發生端採用構造靜態參數表並通過二階正弦振蕩器產生信號，信號檢測端提取頻率信息以檢測信號;對呼叫進程音設計，除了類似雙音多頻的信號發生及頻率檢測設計外，還需要檢測信號持續時間，作者設計了一種基於匹配狀態表的方法以檢測信號持續時間。 -
Frequency - hopping ( fh ) is a novel spread spectrum communication technique, which develops very fast in military field due to its lpi / lpd ( low probability of intercept / detection ) properties and immunity against interferences, the extensive application of hf ( high frequency ) frequency - hopping radios in military has greatly enhanced the ability of military equipments against jamming and interception and brought up a new austere challenge for communication countermeasures
跳頻通信具有良好的抗干擾性，低截獲概率及組網能力，因此跳頻技術的一出現，便在軍事領域得到了極大的發展，採用跳頻技術的短波電臺在軍事通信中得到了廣泛應用，極大地提高了軍事裝備的抗截獲和抗干擾能力，向通信對抗提出了嚴峻的挑戰。 -
( c ) propose the scheme to implementing the coder and deoder of optical time - spreading / frequency - hopping, by assigning two orthogonal codes for one user and using these two codes to encoding 1 and 0 respectively, differential detection can be adopted. not only improves system performances in ber, but also resists the interference such as mai, and does n ' t need any control devices to evaluate the optimum decisive threshold
通過給每個用戶指定互相關為0的兩個地址碼分別發送1和0信號以及在接收端採用差分檢測技術，避免了ook （開關鍵控）光通信系統中0不發送光脈沖和ook常規檢測方式下最佳判決門限必須根椐用戶數等外界環境而改變，從而提高了系統性能和降低了系統的復雜度。 -
A / d samples the intermediate frequency signal. the digital signal proceeding part based on tigersharc dsp can process the baseband digital signal including the algorithm of baseband modulation, baseband differential detection and symbol synchronization, etc. digital up converter supports interpolation filter and complex mixer
A / d對中頻信號進行采樣，數字信號處理部分以tigersharcdsp為核心，負責基帶采樣數字信號的處理，實現基帶信號調制，基帶差分解調，符號同步的捕獲和跟蹤等演算法。 -
In addition, based on fast fourier transform ( fft ), an effective and reliable carrier frequency detection method has also been designed in this thesis
此外，論文還設計了一種有效可靠的基於fft的載波頻率測量方法。 -
And some useful rules are concluded from these experiments. the pd signals on different frequency scopes are surveyed, and the thesis explores anti - noise narrowband detection of partial discharge signals. for the first time the thesis brings forward the choosing - frequency detection of pd ground on the radio frequency communication
同時，進行了局部放電不同頻段信號檢測，為窄帶抗干擾檢測技術奠定基礎，並首次提出基於射頻通訊原理的選頻檢測原理及檢測設想；在實驗室中進行了局部放電超高頻信號的檢測，驗證了超高頻法檢測局放信號時對空間電暈干擾的抑制作用。 -
A study on the vibration frequency detection of the dynamical systems using topology contravariant functor
基於拓撲反變運算元動力系統振動頻率檢測方法的研究 -
Weak sinusoidal signal frequency detection via the array of duffing oscillators
杜芬振子陣列實現弱正弦信號頻率檢測
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