short-time fourier transform 中文意思是什麼
short-time fourier transform
解釋
短傅利-
Under the condition of " comparatively weak correlation between the two noises involved, coherence function is used as a frequency domain amplification factor for improving snr of the output signal to the filter and the speech enhancement effect. meanwhile, a real - time recursive algorithm is put forward in substitute for current algorithms based on short time fourier transform. the new algorithm will simplify computations and will be suited for real - time implementation together with the adaptive systems
接著針對上述nanc系統兩路輸入信號噪聲相關性弱的情況，用相干函數作頻域增益因子來提高輸出信噪比與改善語音增強效果，同時，通過一種實時迭代演算法解決了短時傅氏變換計算量大的問題，簡化了計算，便於實時處理與實際應用。 -
The computer simulations show the validity of the models. 3. joint estimation of the time delay and doppler frequency based on short - time fourier transform ( stft ) and time - frequency analysis are studied to estimate the parameters of the underwater target echo
針對主動回波信號參量的估計問題，重點研究了利用短時傅立葉變換、時頻分析進行時延和多普勒頻移聯合估計，進而進行目標距離和速度參數的估計。 -
In this paper, a pulsar de - dispersion algorithm based on the short time fourier transform ( stft ) is presented
摘要敘述了一種基於短時傅立葉變換的脈沖星消色散演算法。 -
Secondly, a dstft ( discrete short time fourier transform ) - based demodulation method for the 2fsk signal is studied and algorithms for symbol synchronization and symbol decision are analysed
重點研究了基於離散短時傅里葉變換解調2fsk信號的方法，分析了幾種碼元同步演算法和碼元判決演算法。 -
Then, this thesis concerns with the wavelet transform and its application in power system and compare the deficiency vs strongpoint between the fourier transform, short - time fourier transform. this article point out that wavelet transform fit for non - stationary signals analysis and put it into the measurement of voltage sag. based on the comparion of several algorithm of voltage sag measurement in the literature, the thesis put up a new voltage sag measurement algorithm - - - combination of wavlet transform and root - mean - square. the thesis validate the algorithm according to simulation and actual measuring data
並將小波分析用於電壓凹陷的測量中。在詳細對比了現有文獻上已有的幾種凹陷檢測演算法的基礎上，提出了有效值與小波分析相結合的電壓凹陷測量演算法，文章對小波函數的選取，處理時的去噪，分解尺度的確定等問題進行了詳細的論述，從而實現了本文提出的電壓凹陷定義的測量。根據實測數據和模擬數據，對該演算法進行了驗證，證明該演算法是可行的。 -
Fourier transform cannot offer entire information of signals, namely frequency information presenting to any period of time cannot be confirmed on earth. although, short time fourier transform can obtain local information, it is difficult to find a " good " time window to fit for every period of time
傅立葉變換不能提供信號完全的信息，即不知道頻率信息究竟出現在那些時間段上；短時傅立葉變換雖然可以獲得局部信息，但是對於一個時變的非穩定信號我們很難找到一個「好的」時間窗口來適應各個時間段。 -
Vibration signal of cable - stayed bridge often have non - stationary and timely character. traditional fourier transform is a kind of whole transformation and short - time fourier transform have the limitation that if short - time window is ascertained, its shape is also certain. but wavelet analysis method have higher and lower time solution at low frequency, have lower frequency solution and higher time solution
斜拉橋的振動信號常呈現非平穩時變特點，傳統的傅里葉分析是一種全局的變換，短時傅里葉變換也存在著當短時窗函數確定后，窗口的形狀就確定了的缺陷，不適于處理斜拉橋動測信號。 -
Digital receiver and its forepart operational principle are discussed, then methods of instantaneous autorelation, short - time fourier transform, wigner distribution and wavelet analysis are introduced in detail. the advantages and disadvantages and the application range of these algorithms are given. based on the merits of these algorithms, a new method for signal modulation type analysis is presented
本文討論了數字接收機以及前端的工作過程，然後詳細闡述了瞬時自相關、短時傅立葉變換、 wd演算法、過零檢測和小波分析等各種演算法在脈內調制分析上的應用，分析了各演算法的優缺點，提出一種并行處理模式：即針對不同的信號採用不同的演算法對脈內調制信號進行分析。 -
2. discuss the discrete form of time - frequency analysis ; give the simulations of wigner - ville distribution and short time fourier transform under different snr. at same time, to overcome the cross - term of wvd, choi - williams distribution and b - distribution are introduced
以wvd為研究重點，對時頻分析的概念、性質做系統的介紹；給出常用的時頻分析形式，例如短時傅立葉變換、 wigner ? ville分佈；最後給出時頻分析的一般定義。 -
Short - time fourier transform and time - frequency distribution series are applied to time - frequency imaging. time - frequency distribution series based on wavelet transform is discussed., and a new time - frequency tool : frequency - shear distribution is introduced into radar imaging fields
討論了基於小波變換的時頻分佈級數，把一種新的時頻分析工具? ?頻率-切變分佈應用於時頻成像。 -
In the past, we used to analyze speech signal and filter the noise by short - time fourier transform in the frequent domain. however, this method is not effective to the white noise
在過去，我們一般使用短時傅立葉變換（ sfft ）在頻域內對語音信號進行分析降噪，但是對于白噪音，這種方法的效果往往不盡人意。
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