frequency modulation noise 中文意思是什麼
frequency modulation noise
解釋
調頻噪聲- frequency : n. 1. 屢次，頻仍，頻繁。2. （脈搏等的）次數，出現率；頻度；【物理學】頻率，周率。
- modulation : n 調整，調節；（聲調的）抑揚，變化；【音樂】轉調，變調；【無線電】調制。 amplitude modulation 振...
- noise : n 1 聲音，聲響。2 叫喊；嘈雜聲，噪音；喧鬧聲；吵鬧，騷動，騷擾。3 〈古語〉謠言，風聲。4 〈美國〉...
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For micro - cavity semiconductor laser, station model is proposed in this paper and its steady - state and instantaneous characteristics when the coupling efficiency of spontaneous emission into a lasing mode is equal to 1 are analysised. for current noise, sp noise, noise, p noise, as well as current modulation, sp modulation, modulation and p modulation, using small - signal approximation, we derive the laser ' s corresponding transfer functions. and we calculate their signal - to - noise ratio ( snr ) gain in various parameters through frequency domain analysis in the premiss of large input snr
本文對于微腔半導體激光器，提出站模型，能夠較直觀簡潔地分析微腔半導體激光器的穩態和瞬態特性，利用此模型對具有重要實用價值的= 1的微腔半導體激光器進行了討論；對于電流i噪聲、自發發射壽命_ （ sp ）噪聲、自發發射因子噪聲、光子壽命_ p噪聲，以及電流調制、 _ （ sp ）調制、調制、 _ p調制，在小信號近似下，得到了相應的激光器的傳遞函數；在大信噪比的前提下，對激光器進行了頻域分析，分別計算了它們在不同參數下的信噪比增益，分析了其抗噪聲性能。 -
Some people living near wind farms complain they are kept awake by a phenomenon known as aerodynamic modulation ( am ), low frequency noise made as the blades swoosh through the night air
有些住在風力發電廠附近的人抱怨，他們因為一種稱為空氣動力調變的現象，即輪葉的颼颼聲劃過夜空，產生低頻噪音，以致無法入眠。 -
In attempt to directly compare the sound response characters of the same bf neurons or different bf neurons and their interactive relation, the double recording microelectrodes were penetrated into two different neurons in iso - frequnency laminas or hetero - frequency laminas. taking advantage of frequency tonotopical arrangement in 1c of bats, it was explored how the neurons integrated different parallel processes of the same sound information. in the case of which, we hoped to explore the relation between the sound response characters of the central auditory neurons and neural modulation in background noise for the further understanding of the mechanism in the central auditory neurons extracting sound signals
本研究以大棕蝠（ bigbrownbat ， eptesicusfuscus ）為模型，利用ic聲調組構排列成同頻層這一結構特點，突破單電極記錄和檢測神經元的方法，同時推進兩單電極至一個同頻層或兩個同頻層的兩個不同神經元，試圖從細胞水平直接比較兩個具有相同和不同最佳頻率的神經元聲信號的加工處理特徵、以及它們之間的相互關系，以期窺探它們在對同一聲信號處理過程中的整合奧秘，並以此為基礎分析和探討背景噪聲條件下中樞神經元聲反應特徵與神經調制的關系，以期進一步了解中樞聽神經元聲信號提取的機制。 -
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。 -
Chaotic switching modulations introduce low - frequency harmonic spectrum of output voltage as random switching modulation. in some case, low - frequency noise ripple offset the effect chaotic switching modulations reduce the level of emi. it indicates that the ccfmfd integrates the advantages of spreading harmonic power at the multiples of the switching frequency and not introducing significant noise ripple at low - frequency range. among all chaotic switching modulations, the ccfmfd is considered as the best choice in applying to dc / dc converter
與隨機調制模式相同，混沌開關調制模式也引入輸出低頻噪聲紋波，有些情況下低頻噪聲紋波可能抵消混沌開關調制降低emi水平的效果。分析表明： ccfmfd模式具有較好的降低emi水平和引入較小低頻紋波的優點，可以作為混沌調制模式較佳的選擇。 -
Second, research and analyze the feature of signal of pulse compression radar, and discuss the principle and characteristic of pulse compression technique, that are linear frequency modulation and phase coding. the above two mathematic model is constructed, and shift - frequency noise is imposed on the models, and anti - nose ability is evaluated and simulated
通過對脈沖壓縮雷達的信號特徵的研究和分析，通過研究線性調頻和相位編碼脈沖壓縮技術的原理和特點，建立了這兩種雷達的數學模型，並對此進行移頻干擾和相位編碼雷達干擾，並進行干擾性能的評估和模擬研究。 -
Because of the complicacy of the circuit, all sorts of influencing factors, such as power and high frequency modulation etc., are considered to strengthen the harmony and the noise - immunity of the system, while the printed circuit board is designed
由於電路復雜，在印刷電路板結構設計中，考慮了功率高頻調制等各種因素的影響，以增強系統的協調性和抗干擾性。 -
Compared with dcsk modulation, the fm - dcsk modulation changed the chaotic signals with random magnitude into the signal with constant magnitude and random frequency, thus the systemic noise performance is achieved
將振幅隨機變化的混沌信號變為頻率隨機變化而振幅恆定的混沌fm信號，降低了系統的誤比特率。 -
Chaotic switching modulations generated from different chaos sequences introduce low - frequency output noise ripple : in the cpwm, cppm and ccfmvd, the output noise ripple introduced by henon map chaos sequences is smaller than chua ' s circuit chaos sequences ; in the ccfmfd, chua ' s circuit chaos sequences introduced smaller noise ripple. this clue to us that it is important to choose chaos sequences in applying chaotic modulation to dc / dc converters
不同混沌調制信號對輸出紋波影響的分析結果表明： cppm 、 cpwm和ccfmvd模式下， henon映射混沌序列引入低頻噪聲紋波比蔡氏電路摘要混沌序列要小; ccfmfd模式下，蔡氏電路混沌序列引入的低頻紋波要小。這提示我們:在開關模式電源使用混沌調制控制時混沌序列的選擇也具有重要性。 -
Based on the statistics characteristic of prc - phase - modulation cw phase - array guidance radar, this thesis discusses the signal processing method and cfar algorithm of multiple repetition frequency pseudo - noise m - sequence phase coded signal
本文結合偽碼調相連續波信號體制的特點，深入研究了多參差重復頻率偽隨機m序列相位編碼信號的處理方法和恆虛警檢測演算法。 -
The arithmetic formulas for sine wave, linear frequency modulation signal, v - style frequency modulation signal, white noise signal, reverberation signal and echo signal are given by their definition
根據信號類型的定義，給出了正弦信號、線性調頻信號、 v型調頻信號、白噪聲、混響和回波信號的合成公式。 -
This paper gives us too ways ： one is to adopt a better modulation mechanism, s - cdma, to bate noise jamming. the other way is to implement automatic frequency agility under strong noise, based on the ranging and burst configuration mechanism of current docsis protocol, meanwhile, guaranteeing cmts ' s normal operating. this paper comprehensively analyzes the anti - jamming mechanism of docsis, then presents the specific implementation of the latter method
如何降低噪聲對網路的危害，本論文指出了兩個方向，其中一個就是在調制體制上下工夫，採用s - cdma體制，通過改變調制方式來主動的抑制噪聲的影響；另一個方向就是基於現在協議提供的抗噪聲干擾的機制，充分挖掘測距機制和靈活的突發配置機制的抗干擾潛力，以不影響頭端設備的正常運行為前提，以它們為基礎實現能自動避開強噪聲干擾的頻率轉移。 -
The system had auto startup and stop function by software. the dsp based motor control system had lower current harmonic, more efficient use of supply voltage than spwm, less switch loss. on the other hand, this system make a lower noise for the pwm modulation. frequency is up to 20khz
本系統實現了電機的軟啟動、軟關斷功能，電機電流的諧波失真較少，電壓利用率比常規的正弦波脈沖寬度調制（ spwm ）有了較大的提高，器件的開關損耗也得到了明顯的減少。 -
Then on one hand, author makes researches of anti - jamming against pulse jamming 、 gauss white noise jamming and radio frequency noise jamming from the side of signal processing. author exercises much signal processing knowledge of time - domain sliding window accumulation 、 wavelet analysis 、 time - frequency analysis and linear prediction and carries out many simulation experiments. on the other hand, author proposes the anti - jamming methods of using a sar similar to double - base radar and modulating the amplitude 、 the phase of emission signal and changing the frequency modulation slope from the side of changing sar system model
作者首先提出了合成孔徑雷達抗干擾的定義、分類以及評價抗干擾方法好壞的主客觀標準；然後，一方面從信號處理的角度出發對脈沖式干擾、高斯白噪聲干擾以及射頻噪聲干擾進行了抗干擾研究，其中運用了時域滑動窗口積累，小波分析，時頻分析以及線性預測等信號處理知識，做了大量的模擬實驗；另一方面，本文基於改變合成孔徑雷達系統模式提出了利用類似雙基地雷達來抗干擾，以及對發射信號進行調幅、調相以及改變調頻斜率來抗干擾，同樣做了相應的模擬實驗。 -
Sigma delta modulation frequency synthesis is an advanced technology that applies in pll ( phase - locked loop ) frequency synthesizer, which could transform the spurs created by fractional - n synthesizers into phase noise that could be filtered by inherent low - pass identity in pll
此技術應用-調制將鎖相環頻率合成器中分數分頻器產生的相位雜散轉化為相位噪聲，通過鎖相環本身低通濾波特性濾除，從而使用單環即可獲得很高頻率解析度和極低的相位雜散。 -
The adaptive sr, studied in this thesis, means that the system automatically selecting parameter with a recursive algorithm, not adaptively adding noise. a parallel connection sr system is introduced and its application in digital frequency shift modulation signal transmission is discussed
我們初步提出了參數自適應隨機共振的思想以及收斂演算法，同時，我們還研究了數字信號載波調制傳輸中的並聯隨機共振系統。 -
Introduction to communication systems ? analysis and design of communication systems ; analog and digital modulation and demodulation, frequency conversion, multiplexing, noise and distortion ; spectral and signal - to - noise ratio analysis, probability of error in digital systems, spread spectrum
通信系統基礎：通信系統分析和設計，模擬和數字調制和解調，頻率轉換，統計復用，噪聲和失真；譜分析和信噪比分析，數字系統誤碼率，擴展頻譜。 -
Frequency - modulation noise
調頻躁聲
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