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日期:2025-11-16
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:2025-11-16
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:2025-11-16
The MATLAB® functions fft, fft2, and fftn (and their inverses ifft, ifft2, and ifftn, respectively) all use fast ......
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日期:2025-11-17
This MATLAB function returns the discrete Fourier transform (DFT) of vector x, computed with a fast ......
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日期:2025-11-18
Learning Objectives. Discrete Fourier transforms (DFTs) and their relationship to
the Fourier transforms. Implementation issues with the DFT via the FFT....
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日期:2025-11-19
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...
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日期:2025-11-15
This example shows how to use the FFT function to analyze the variations in sunspot activity over the last 300 years. ... Sunspot activity is cyclical, reaching a maximum about every 11 years. Let's confirm that. Here is a plot of a quantity called the Zu...
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日期:2025-11-17
Understanding FFT was never so easy!; Author: Grasshopper.iics; Updated: 20 Jan 2012; Section: Algorithms & Recipes; Chapter: General Programming; Updated: 20 Jan 2012 ... Points of Interest You can learn Matlab fundamentals from this source To ......


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