頻率調制 的英文怎麼說
中文拼音 [bīnlǜdiàozhì]
頻率調制
英文
frequency-modulation-
Frequency modulation does not allow static to creep in.
頻率調制不允許靜電干擾混入。The calls of non - passerine are some kinds of monotonous dull vocalizations with the characteristics of low and deep frequency, single syllable, low basic frequency and with no ability of modulation in frequency and amplitude. most of the calls are monotonous and low quality mainly based on the basic song. compare the vocal of sub - oscine passerine with non - passerine, they have some similar aspects, but the former possesses of stronger capability of vocal control
非鳴禽的叫聲低沉而單調，音節種類單一，基本音頻率低，缺乏頻率調制以及幅度調制的能力，叫聲的品質因數很低，不悅耳，大多為以基本音為主的單音調低音品叫聲，亞鳴禽的叫聲與非鳴禽近似，但在控聲能力方面又有所提高。Compared with non - passerine, they appeared longer syllable length, higher basic frequency and more viable frequency ranges. though the amplitude modulation properties enhanced their vocal production, the type of syllable is still stable and less of variety. so the phrase consisted of syllables are comparatively few and changes of the tone are relatively less
且表現出很強的頻率調制特性和特有的幅度調制特性，相對的音節時程比較長，基頻較高且頻率變化范圍較大，所特有的幅度調制特性更增加了其控聲的能力，但其音節的種類仍很單一，缺乏變化，由音節所組成的句型較少，音調變化幅度不大，因此，其叫聲質量盡管較非鳴禽有所改善，但相對鳴禽而言卻又遠遠不如。Pulse frequency modulation pfm
脈沖頻率調制Pfm pulse frequency modulation
脈沖頻率調制Pl pulse frequency modulation
脈沖頻率調制Methods of measurement for radio equipment used in satellite earth stations - part 2 : measurements for sub - systems - section seven - frequency modulators - section eight - frequency demodulators
衛星通信地球站無線電設備測量方法第2部分:分系統測量第7節:頻率調制器第8節:頻率解調器The research on carrier spectrum, modulation schemes and signal codes of plc networks has received much attention, while the mac protocol of plc networks is usually adopted from general - media computer networks
目前國際上注重研究plc網路的載波頻率、調制方式、信號編碼等關鍵技術。而對于plc網路的mac協議，卻通常採用修改的常規計算機網路的mac協議。Telegraphy using frequency modulationnarrow band direct printing
頻率調制發射窄帶印字系統The temperature range is - 30 ~ 80. the topology of the step - up dc / dc converters and its basic principle is first analyzed in this thesis. then based on the conventional pfm control scheme, a discrete pulse frequency modulation is presented and the state space average model related to the ccm ( continue current mode ) and dcm is established
然後在傳統的脈沖頻率調制方式的基礎上，分析了一種離散脈沖頻率調制方式，並建立了這種調制方式下升壓型dc / dc變換器在電流連續（ ccm ）工作模式和電流斷續（ dcm ）工作模式的狀態空間平均模型。The 7 years ' applicable practices indicate that the frequency modulation technology with dc bus voltage ripples is very effective to suppress acoustic resonances
7年的使用實踐表明，直流脈動電壓頻率調制技術對抑制聲諧振現象十分有效。For digital audio encoding and decoding modules, delta - sigma modulation is introduced and audio data, preambles with accessorial data are multiplexed according to the digital audio interface standard ; for carrier wave, pll frequency synthesizer is used ; for frequency modulation, voltage control oscillator is taken ; for demodulation, pll frequency discrimination is adopted
調制方式，並按照數字音頻介面標準對音頻數據、同步字和附加信息進行通道復用;對于載波信號，採取鎖相環頻率合成技術手段;對于頻率調制，採用壓控振蕩器;對于解調電路，採取鎖相環鑒頻電路。Chirp signal is a kind of pulse - compressed signal with large time - bandwidth products achieved through linear frequency modulation. it has high resolution in range because of its great bandwidth
線性調頻信號是通過線性頻率調制獲得大的時寬帶寬積的一種脈沖壓縮信號，具有大的帶寬，因此有高的距離分辨力。Lfmcw ( linear frequency modulation continuous wave ) radar is a radar system which can get the information of range and velocity through modulating the frequency of continuous wave
線性調頻連續波（ lfmcw ）雷達是一種通過對連續波進行頻率調制來獲得距離與速度信息的雷達體制。Because of the advantages of no range blind area, high range resolution, low signal power and simple structure, lfmcw ( linear frequency modulation continuous wave ) radar attracted more and more attention recently
線性調頻連續波（ lfmcw ）雷達是一種通過對連續波進行頻率調制來獲得距離與速度信息的雷達體制系統。由於其具有無距離盲區、高距離解析度、低發射功率、結構簡單，便於集成化等優點，適合用於液位測量系統。However, it is difficult to make the product available because most of the academic institution focused on certain aspect only. the experts indicate that the ic designers should know more about the system though they don ’ t design the system directly. it points out a way for us ic designers when we are engaged in the research work
本文提出的開關變換器，利用反饋原理將輸出電壓穩定在某一需要的值，根據負載的不同而採取兩種控制模式，即脈沖寬度調制（ pwm - pulsewidthmodulation ）模式和脈沖頻率調制（ pfm - pulsefrequencymodulation ）模式。Via theoretical analyzing, we can find that the step reference waveform modulation strategy is an ideal one when frequency modulation ratio is not very high
通過理論分析，可以看出階梯波調制pwm的確是在頻率調制比不高時較好的調制方式。In succession, the theory of chirped - pulse amplifier system is given in detail, firstly, studying from designing experimental light road and optical components to theoretical analysis, we par ' tly finished the system by ourselves. about ultr a - shoft pulse with a pulse - width of 9. 8f s and output power of 650mw and band - width of about l 20nm is output from oscillator source, secondiy, the stretching capacity of single grating four - pass stretcher is measured using abcd matrix combining collins function, and the effect of relativ e parameters to the streching ratio is also simulated. thirdly, a new type of disjunctional frequency moduiating function is provided according to the gain - narrowing and gain - saturation which are appeared in the co urse of amplification, under modulating the two effects are both controlled on some e xtent, fourthiy, the effect of ase that is often ignored by people is analyzed and the resolving methods are also given
從光路、光學元件的自行設計到理論分析計算，初步建立了一臺實驗系統；採用abcd矩陣法結合collins公式計算了四通式單光柵展寬器的展寬量，並模擬了相關參數對展寬比的影響，對實驗具有指導意義；評價了再生放大器和多通放大器的優缺點，對放大過程中通常忽略的放大自發輻射現象（ ase ）進行了分析，並提出了相應的解決方法；針對放大過程中出現的增益窄化和增益飽和現象，對輸入種子脈沖提出了一種新的分段頻率調制函數，實現了對增益窄化效應和增益飽和效應的共同抑制；提出了系統的材料（包括放大介質和光路中的普通介質）正是融合高階色散的來源。Further, the characteristics such as the response speed, the efficiency and the relationship between load and the modulation factor are counted and analyzed. during the stage of circuit design, the whole chip and the sub - block circuits are well - designed, respectively
基於此模型，計算並分析了離散脈沖頻率調制下升壓型dc / dc變換器的響應速度、效率和負載與調制度的關系等特性。The author pays more attention to the analysis and design on the following sub - circuits : oscillator, comparator, hysteresis comparator, chip enable, etc. on completing the principle analysis and circuit design, the sub - circuits and whole chip circuit are verified with the eda tools hspice
其次在電路設計中，作者基於升壓型dc / dc變換器和離散脈沖頻率調制方式的基本原理並根據電路功能的需要，進行了控制電路的總體結構設計和子電路模塊設計。分享友人