Any periodic function can be expressed with Fourier series. This decomposition and analysis method with
Fourier series is extensively used in many fields such as mathematics, physics, engineering. For example, in order to eliminate noise of some electric appliance, instrument or machines, the major frequency spectrum of the noise need to be analyzed to look for a elimilation method; If a special periodic electrical signal is needed, it can be composed with Fourier composition series, which is to compose the signal with several sine waveforms.
Fourier composition and decomposition apparatus produced by our company can be used to analyze spectrum of square wave signal with series resonant circuit, to measure the amplitude of base frequency and double frequency signals and phase relation of them; It can also be used to do the reverse experiment, that is to compose a group of sinusoid of multiplied frequency and different phase and amplitude into a bar signal. The students can better understand the physical meaning of Fourier decomposition and composition, basic properties of series resonant circuits and their application in the frequency selection circuit.
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