Abstract
The pulse signal is not only expressed as superposition of harmonic component, but also can be decomposed to the corresponding harmonic component. In this study, we designed an experimental simulation for make students learn knowledge of the signal process, which as a continuous cycle rectangular pulse signal, the function of relationship on harmonic component amplitude and duty cycle was discussed. Meanwhile, based on the simulation analysis and Fourier analysis, the relationship curve of duty cycle and harmonic component amplitude of rectangular pulse signal was given, and a new technique about changing harmonic amplitude or eliminating some or other harmonic component based on pulse duty cycle was proposed. The parsing circuit model of second-order active band-pass filter, by setting the center frequency of narrow-band band-pass filter circuit, decomposed the harmonic component of rectangular pulse signal under the given duty cycle with the method of simulation experiment. The results also showed that harmonic component amplitude of rectangular pulse signal could be changed in the form of sinusoidal function, by adjusting the duty cycle. When the duty cycle and amplitude of rectangular pulse signal were at the same time, its higher harmonic order component and harmonic amplitude were the same.
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