MASS
发表于 2025-3-21 16:51:03
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河潭
发表于 2025-3-21 21:38:01
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Indelible
发表于 2025-3-22 01:22:35
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确定无疑
发表于 2025-3-22 07:06:34
Fourier Series Expansion,nd odd functions. The former and the latter can be expressed by cosine and sine functions, respectively. The next step is the expression of a Fourier series by complex exponential functions. The coefficients in this case are also complex, but since the mathematical manipulations are simpler, this method will be used most of the time hereafter.
大范围流行
发表于 2025-3-22 10:36:45
Baleshwar Thakur,Rajiv R. ThakurOld analog techniques of Fourier analyzing signals are passé due to major advances in digital technology. Modern digital processing involves sampling analog time signals that are obtained from transducers (such as microphones or accelerometers) at uniform time intervals.
转换
发表于 2025-3-22 13:03:20
Sustainable Development Goals SeriesThe digital Fourier transform (DFT) pair introduced in . is a very useful formula for numerical operations of the Fourier transform. However, if one tries to perform the calculation, it requires a large number of computations.
转换
发表于 2025-3-22 19:49:59
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machination
发表于 2025-3-22 21:52:16
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考古学
发表于 2025-3-23 02:26:32
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Pulmonary-Veins
发表于 2025-3-23 06:55:29
DFT and Spectrum,One of the important purposes of Fourier analysis is to obtain spectra of waveforms. For that purpose, DFTs are performed on numerical sequences made from waveforms using a computer or a similar fast operational device.