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日期:2024-04-13
對y進行快速傅立葉轉換後,其頻譜會從L/2處呈現對稱的形式,因此只需顯示0~ 500Hz的頻譜,即可顯示訊號 ......
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日期:2024-04-18
This MATLAB function returns the discrete Fourier transform (DFT) of vector x, ... f = Fs/2*linspace(0,1,NFFT/2+1); % Plot single-sided amplitude spectrum. plot(f ......
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日期:2024-04-14
This MATLAB function returns the discrete Fourier transform (DFT) of vector x, computed with a fast Fourier transform (FFT) algorithm. ... The FFT functions (fft, fft2, fftn, ifft, ifft2, ifftn) are based on a library called FFTW [3],[4]. To compute an N-...
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日期:2024-04-14
The FFT in One Dimension Introduction Basic Spectral Analysis Spectral Analysis of a Whale Call Data Interpolation Using FFT Introduction The MATLAB fft function returns the DFT y of an input vector x using a fast Fourier transform algorithm: y = fft(x); ...
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日期:2024-04-15
The MATLAB® functions fft, fft2, and fftn (and their inverses ifft, ifft2, and ifftn, respectively) all use fast ......
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日期:2024-04-17
This MATLAB function returns the discrete Fourier transform (DFT) of vector x, computed with a fast ......
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日期:2024-04-13
Learning Objectives. Discrete Fourier transforms (DFTs) and their relationship to the Fourier transforms....
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日期:2024-04-15
Fast Fourier Transform (FFT) is a technique frequently used in signal processing. A Fourier transform approximates any continuous function as the sum of periodic functions (sines and cosines). FFT does the same thing for discrete signals -- series of data...