How to visualize the spectrum of the raindrop desktop: Open the parameters, basics and special effects, then check Use Visualization when playing audio, select wmp Visualization below, and select Instant in the corresponding drop-down menu.

Spectrum is the abbreviation of spectrum density, which is the distribution curve of frequency. The complex oscillation is decomposed into harmonic oscillations with different amplitudes and frequencies, and the graph of the amplitudes of these harmonic oscillations arranged by frequency is called frequency spectrum. Widely used in acoustics, optics and radio technology. Its research on signals leads from time domain to frequency domain, which brings more intuitive understanding.