词汇和段落翻译 (1)傅里叶级数(2)Trigonometric expansion of Fourier series (3)discrete spectrum (4)幅频谱(5)Phase spectrum (6)Complex exponential function expansion of Fourier series (7)Most complex dynamic mechanical signals may be decomposed into a combination of simple harmonic components,whether the signals are steady-state or transient. Those dynamic signals can be pressure, displacement, strain, or something else. If the original signal is taken apart into frequency components, each component will have its own amplitude and frequency. It will have various phase relations with the other frequency components. A general mathematical statement of dynamic mechanical signals may be written as follows, and this is the well known Fourier transformation process actually. In the formula, An and Bn =amplitude constants called harmonic coefficients. n is called harmonic orders.
A、Fourier Transform
B、Discrete-time Fourier Transform
C、Discrete Fourier Transform
D、Discrete-timing Fourier Transform
If the Fourier transform of the signalshown in Figure (a) is. Then the Fourier transform of the signalin Figure (b) is
A、
B、
C、
D、
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