discrete-time fourier transform 中文意思是什麼

discrete-time fourier transform 解釋
離散時間傅里葉變換
  • discrete : adj. 1. 分離的，分立的；顯然有別的。2. 不連續的；【數學】離散的；【哲學】抽象的 （opp. concrete）。adv. -ly
  • time : n 1 時，時間，時日，歲月。2 時候，時刻；期間；時節，季節；〈常pl 〉時期，年代，時代； 〈the time ...
  • fourier : n 1 傅立葉〈姓氏〉。2 Francois Marie Charles Fourier 弗朗瓦斯馬利沙利傅立葉〈1772 1837，法國空想...
  • transform : vt （使）變形；（使）變化[轉化，轉變]；變態，改變（性質、機能等），改造，改革；【數學】變換；【電...
  1. The numerical method based on the coupling of the finite difference method in time domain with the discrete fast fourier transform is applied to calculate the first four eigenfrequencies and eigenfunctions of the six - cavity with open boundary. the absorbing boundary condition for tem wave is tested numerically, and it is applied to writing the code. the cold testing of the cavity is done and the results are good agreement with the numerical results

    計算x波段六腔開放腔前四個模式的場分佈;根據第二章公式分別計算x波段六腔開放腔前四個模式的電子負載電導並總結了這四種工作模式渡越效應的規律，基於這種小信號理論分析了x波段渡越輻射振蕩器，得到了工作模式及可能產生的模式競爭。
  2. 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。
  3. To solve the aberrance problem of electromagnetic signals caused by fourier transform of limited time and discrete sampling, the function and the influence of windows with different scales were discussed

    摘要針對電磁法物探觀測信號離散傅立葉變換中信號畸變問題，研究了不同尺度窗口對信號分析的作用和影響。
  4. A modified real signal model of channelized transmitter is presented that employs multiphase filters and discrete fourier transform to maximize computing efficiency, which can mean much in a radio communication system that requires real - time processing

    特別提出了改進的實信號通道化發射機數學模型，通過利用多相濾波與離散傅立葉變換，減少信號處理運算量，這對于強調實時運行的無線通信系統有重要意義。
  5. Though the two new methods can improve the effect of edge detection, they need the gabor and wavelet transforms which make the computation complex and cost much time and are not easy to used in real - time application. this paper presents an efficient fast approach to compute real discrete gabor coefficients by applying the fht ( fast hartley transform ) in gabor transform, also the fft ( fast fourier transform ) is proposed to used in compute the wavelet coefficients

    雖然gabor和小波的引入能提高邊緣檢測的效果，但往往因其計算的復雜性而受到限制，本文提出了一種有效的離散gabor變換演算法來計算有限離散實數信號的gabor系數，同時，也給出了基於fft的小波變換快速演算法，為理論的快速實現提供了可能性。
  6. By studying the discrete fourier transform properties of the band - limited digital signal, the authors introduce alternating projection neural networks into the paper, expand apnn ' s application scope from real field to complex field, and present several important conclusions on apnn. analyzing and discussing network ' s tolerance to noise, convergence rate and the spectral leakage problem of the truncated signal expected to be extrapolated by using these conclusions, the paper presents an extrapolation algorithm for band - limited signals based on alternating projection neural networks. a lot of simulation experiments show that the algorithm is effective. in addition, the algorithm is also effective to spectrum extrapolation. owing to adopting network structure, the algorithm is prone to parallel computation and vlsi design, and consequently can satisfy real time military processing needs

    本文通過對頻帶受限數字信號的離散傅立葉變換特性的研究，引進了交替投影神經網路，並將其應用范圍從實數域拓廣到復數域，且給出了在復數域仍然成立的若干結論.運用這些結論，在對網路噪聲抑制、網路收斂速度及待外推信號因截斷而造成頻譜嚴重外泄問題的分析與討論的基礎上，提出了一種基於交替投影神經網路的外推演算法.模擬實驗表明該方法是行之有效的.另外，該演算法對頻譜外推同樣適用；由於它採用全互連神經網路結構，易於并行計算和vlsi實現，從而可滿足軍事上實時處理的需要
  7. 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。
  8. The discrete fourier transform algorithm can analyze time - domain ' s stationary disturbance signal effectively and confirm the signal ' s distributing in the frequency domain

    而離散傅立葉變換則可有效地對穩態擾動進行分析，得出時域穩態信號在頻域中的分佈情況。
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