frequency crossing 中文意思是什麼
frequency crossing
解釋
頻率交叉-
( 3 ) study the segmentation and recognition of audio frequency signal. audio signal can be divided into segments based on zero - crossing rate. ( 4 ) a audio recognition arithmetic based on mfcc is proposed
音頻信號的處理作為項目的一部分，根據要求實現了對單一音頻信號的識別，用vc6 . 0來實現。 -
The intervarietal crossing has taken place in low frequency when the two varieties are sympatric. 5
二者逆向擴散，在同域分佈時，以低頻率發生變種間雜交。 -
High - frequency link power converters are receiving increasing attention. when the input frequency of ac - ac converter is quite high, such as 20khz or above, in order to make sure the converter switching action is restricted to the zero crossing point of the link voltage, the switching cycle becomes discrete pulse spectrums, however, the conventional pwm converters are ruled out because they would fail either to the efficiency or the low - distortion criteria
當交-交變頻器的輸入頻率非常高，通常為20khz時，為了在零電壓條件下實現逆變器開關管的通斷，變換器的開關時刻必須選擇在高頻交流電壓脈沖為零時，這意味著變換器開關時刻在時間軸上成為不連續的點，而常規的硬開關pwm變換器是將開關時刻選擇在任意時刻。 -
The characteristics of three - level ( tl ) converter and its effect to the zero - crossing distortion are analyzed, and extended it to ml converters, which are suitable for the high input frequency pfc application
文章詳細分析了三電平（ three - level ， tl ）變換器的特點和對輸入電流過零畸變的改善作用，並推廣至多電平變換器。 -
The experience results indicated the reliability of this kind of thermostatic control system. the analysis and compare about modern dielectric loss measuring methods are presented on chapter 3, and the zero - crossing testing phase discrimination method is adapted as the measuring method of this measuring system. furthermore, applied high frequency pulse technique, channel self - correction technique, anti - harmonic technique are used to increase accuracy and reliability of measurement
本文對現代介質損耗測量技術進行了分析與比較，採用過零鑒相比較法作為介質損耗測量方法，並結合外施高頻脈沖技術、通道自校正技術、抗諧波技術，設計了高精度介質損耗測量電路，有效提高了介質損耗測量的精度，減小了測量誤差。 -
Chaper six compared the emd - based time - frequency analysis method to the typical ' s : short time fourier analysis, wigner distribution and wavelet anlysis, the result showed that the emd - based ' s is better than the others. to weaken the crossing interfere in multi - components signal in wigner distribution the emd - based wigner distribution was proposed and the study result showed that the method is valid. chapter seven built a experiment system at the base of rotor test bed, discussed characteristics of several typical fault in rotating m
第六章把基於emd的時頻分析方法分別與短時傅里葉變換、 wigner分佈分析、小波變換進行了比較研究，結果表明，基於emd時頻分析方法比上述方法有效；針對wigner分佈分析的交叉項干擾，提出了基於emd的wigner分佈分析新方法，研究結果表明新方法能有效地消除交叉項干擾。 -
However input current distortion at the zero - crossing of the input voltage is a common problem in active pfc converters, and it becomes more serious as the line frequency is increased. the purpose of this thesis is to reduce the zero - crossing distortion of input current at high input frequency application
但有源pfc變換器存在輸入電流過零畸變的缺陷，並且隨著輸入頻率的升高而越來越嚴重，本文的工作就是針對解決高輸入頻率下嚴重的輸入電流過零畸變而展開的。
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