超噪比 的英文怎麼說

中文拼音 [chāozàobǐ]
超噪比 英文
excess noise ratio
  • 超 : Ⅰ動詞1 （越過; 高出） exceed; surpass; overtake 2 （在某個范圍以外; 不受限制） transcend; go beyo...
  • 噪 : 動詞1. （蟲或鳥叫） chirp 2. （大聲叫嚷） make noise; make an uproar; clamour
  • 比 : Ⅰ動詞1 （比較; 較量高下、 長短、距離、好壞等） compare; compete; contrast; match; emulate 2 （比...
  1. Furthermore, it is also verified by chassis dyno tests that lpg motorcycle has better emission performance than gasoline engine, and has better acceleration performance e. g. exceed acceleration than former gasoline engine, and has low noise level characteristics as well as has ability to achieve equivalent level fuel economy performance compared with former gasoline engine

    整車動力性、經濟性和排放性轉鼓臺架試驗對比表明： lpg摩托車整體排放性能優于汽油摩托車；最高車速略有下降但加速性基本與汽油摩托車相同（超越加速性優于汽油摩托車） ； lpg摩托車具有良好的低噪聲特性，且整車燃料消耗率及其經濟性與原機基本相當。
  2. Analysis and tests show that by using slope compensation, the open - loop instability, sub - harmonic oscillation, non - ideal closed - loop response and noise etc. when duly cycle above 50 %, can be reduced or eliminated

    理論分析與試驗表明，通過引入斜坡補償可以抑制或消除占空比超過5 %時的開環不穩定性、次諧波振蕩傾向、不理想的閉環響應、噪聲等。
  3. The motion compensation of radar target and an analysis of influence of component imperfection in the realization of the method are presented. to evaluate the performance of the proposed method. monte carlo simulation has been conducted to estimate the root mean square error of the angle estimates and the spatial resolution snr threshold in the cases of both non - fluctuating targets and fluctuating targets

    在此基礎上，提出了針對相位權重角度超分辨法的雷達目標的運動補償方法，分析了雷達系統各部件的不理想性對超分辨性能的影響，用montecarlo方法對無抖動目標和有抖動目標在不同信噪比下的方位估計誤差和方位超分辨的信噪比門限進行了模擬計算，並將結果同波束空間music方法及cramerrao限進行了比較。
  4. Arranged signal activating lock circuit and time - base control circuit in the sound wave receiving circuit to take the initial signal of back wave as the valid one in the cycle, thus to improve the ratio of signal vs. noise and detective precision

    在超聲波接收電路中設有信號觸發鎖定電路和時基控制電路。實現以各探頭中最早收到的回波信號為本檢測單元的有效信號，有效提高信噪比和檢測精度； 4
  5. The experiment results from practical multispectral images have shown that this algorithm is efficient. if the original image is reconstructed by five eigen subimages, the nearlossless compression ratio is above 11 for the data used in this paper and the psnr is more than 45db

    實驗結果表明，對機載64波段多光譜遙感圖像進行k - l變換和整數小波變換后，選用五個本徵子圖像重建原圖像，壓縮比可以達到11以上，峰值信噪比則超過45db ，取得了其它方法無法獲得的效果。
  6. The conclusions are as follows : the ultrasonic intensity is proportion to the laser intensity ; the ultrasonic induced by a laser line source has much more advantages than by a laser point source, such as stronger energy, higher snr, more directivity and shape ; the intensity of cfpi ' s output signal is linear with ultrasonic vibration velocity, and is effected by incidence angle and scattered angle ; snr will increase by reducing cfpi ' s bandwidth, reducing incidence angle, increasing cavity ' s length and reflectivity

    在分析點光源激勵聲表面波機理的基礎上，求出了線光源激勵的超聲振動的位移表達式，發現線光源激勵的近場區表面波具有波形好，信噪比高，指向性好，幅度強等特點。通過理論推導，得出共焦fabry - perot干涉儀的輸出光強除了與樣品表面的振動速度成正比，並與入射角和散射角有關；適當減小cfpi的帶寬，增加腔長，增大鏡面反射率，或者減小檢測入射角都可以提高系統的信噪比。
  7. On the design of the system, the thickness measure system of mems chip is built based on lbu and pump - probe technology. on the analysis of data, the reflectivity curve is analyzed using the law of reflectivity change induced by ultrasound, and the thickness is calculated using the system designed by the article, to aluminum film the size of about 20nm can be measured, when the film be measured is single layer, the relative error of the system is less than 2 %, when the film be measured is double layer, the relative error of the system is less than 10 %

    在基礎理論方面研究了激光（特別是超短脈沖激光）超聲的激勵機理，探討了激光調制技術以提高系統信噪比，闡述了泵束探針束技術及相關實驗設置；在系統設計上，以激光超聲為基本原理，以泵束探針束技術為系統設計方案完成了mems基片厚度測量系統的設計；在數據分析方法上，利用聲致光反射率變化的一般規律對測得的光反射率曲線進行分析，確定超聲回波在薄膜兩界面間來回傳播的時間，以計算薄膜的厚度。
  8. With 8 channels, 24 bit 96 khz for recording and 24 bit 192 khz for playback, an exemplary frequency response and a signal - to - noise ratio of better than v100 db, this sound card provides a first - class sound quality by which others can only gauge themselves

    具備了8聲道24bit 96khz錄音24bit 192khz播放的能力，優異的頻率響應及超越- 100db的訊噪比，這片卡所提供的頂級音頻品質讓其它同級產品只能望其項背。
  9. It is used in conventional real aperture radar for improving angle resolution. numerical and experimental results show that by using awsm. the angular resolution is improved by a factor of 1. 8 when signal - to - noise ratio equals to 15db

    實驗結果表明，在15db的信噪比下，採用角度權重方位超分辨技術可以使方位解析度的改善因子達到1 . 8以上。
  10. First, a new method of ultrasound - modulated optical tomography with real - time fast fourier transformation ( fft ) is reported to improve the detection sensitivity and snr. by discriminating ultrasound modulated information carried by scattering photons, the tomographic images of the biological tissue simulating media and a buried object are reconstructed with fft spectral intensity

    1 、用實時快速fourier變換（ fft ）和聚焦超聲調制的光學層析術以增加探測靈敏度和信噪比，用fft實時地將調制光光信號濾出，用其譜強度重建圖像。
  11. For example, the average number of retransmissions can be decreased 50 % at 1 db snr in the gaussian channel and 9 db snr in the rayleigh channel

    如在高斯噪聲環境下，信噪比為1db時減少超過50 % ；在瑞利噪聲環境下，信噪比為9db時也減少了50 % 。
  12. The signal - to - noise ratio of the nondestructive testing system employing optical heterodyne and ultrasonic techniques is analyzed and calculated from two aspects including phase matching of optical heterodyne measurement in nondestructive testing and the effects of beam incidence on the intensity of heterodyne signal and signal beam

    對光外差超聲無損探傷系統的信噪比從兩個方面入手進行了計算分析:第一，光外差測量在無損探傷中的相位匹配;第二，光束入射角對信號光光強和外差信號強度的影響。
  13. The main work of this dissertation can be summarized as follows. 1 、 the low probability of intercept ( lpi ) of uwb radar is analyzed based on the radar equation and reconnaissance equation. the necessity of making reconnaissance of uwb signal in the circumstance of low or negative snr is proved

    本文主要工作如下: 1 、從超寬帶雷達方程和偵察方程出發，分析了超寬帶雷達信號的低截獲特性，證明了超寬帶雷達信號的偵察和參數估計在低信噪比條件下的必然性。
  14. 3. making a deep research on weak sinusoid signal detection using duffing oscillators and combining chaos critical state detection method with general detection methods, this dissertation realizes weak sinusoid signal detection below - 50db snr. furthermore, starting from the analysis of the intermittent chaotic motion occurring in the detecting process, an array of duffing oscillators are used to estimate the frequency of weak sinusoid signals accurately

    （ 3 ）全面深入地研究了duffing振子用於微弱正弦信號檢測的機理，並把混沌臨界狀態檢測法和傳統檢測方法相結合，實現- 50db以下超低信噪比的微弱正弦信號檢測;建立了混沌振子陣列，實現低信噪比下正弦信號頻率的估計。
  15. The solution background that resulted from the chemical interference, would be the primary factor that effected the sensitivity. especially in the present microfluidic system, the chemical background which was usually inevitable because of the carrier solution, would be eliminated by means of using air as the carrier flow, thus a great signal noise ratio ( snr ) and a great sensitivity could be obtained

    在微量分析和超微量分析里，化學干擾產生的溶液背景是影響靈敏度的主要因素，尤其在微流控系統中，載流溶液的背景不可避免，用空氣作載流就可以消除背景而獲得高信噪比和高靈敏度。
  16. How to detect the uwb radar signal and estimate the signal parameters under condition of low signal to noise ratio ( snr ) is very important

    如何在低信噪比下檢測超寬帶雷達信號並進行參數估計具有重要的意義。
  17. After a great amount of detailed computer simulations and concise qualitative and quantitative theoretical analysis, the turbo codes " parameters and fpga specific hardware implementation architecture suitable for being integrated into dtv systems are determined. furthermore, the codec is completely designed with verilog hdl, ending with an occupation of less than a 600 - thousand - gate fpga chip. at this lowest hardware cost, a white noise snr threshold of 1. 8db at a net stream rate of 6mbps is achieved, which exceeds all other existent dtv systems " performance

    經過大量詳細的計算機軟體模擬和簡明扼要的定性與定量的理論分析，最終確定了數字電視系統中適合採用的turbo碼參數及針對fpga特殊構架的硬體實現結構，並用verilog硬體描述語言完成了turbo碼編譯碼器的完整設計，以佔用不到一片60萬門fpga晶元的較少的硬體資源取得了在6mbps凈碼率下1 . 8db的白噪聲信噪比門限這一遠遠超過現有任何數字電視系統的性能。
  18. By designing the circuit structure of preamplifier and selecting new elements such as ultra low noise operational amplifier and linear opto - coupler, some difficulties in eeg acquisition is overcome and the common mode rejection ratio ( cmrr ) of preamplifier is highly increased. so eeg can be amplified and detected well

    通過對前置放大器等電路結構的精心設計，選用超低噪聲的集成運算放大器以及線性光耦合器等新器件，克服了腦電信號採集中經常遇到的一些困難，使前置放大器具有較高的共模抑制比，從而能夠較好地放大檢測出所需的腦電信號。
  19. With this method, the image quality and the detecting depth have been increased

    而聚焦超聲以其良好聚焦效果和調制效率可以提高信噪比和解析度。
  20. In addition, based on fft and remainder algorithm, the modulation rate and initial frequency of sub - sampling uwb lfm signal are estimated unambiguously in negative snr

    該方法通過fft和余數定理解頻率模糊，解決了負信噪比條件下超寬帶線性調頻信號調制斜率和初始頻率的估計問題。
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