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A waterfall plot is a three-dimensional plot in which multiple curves of data, typically spectra, are displayed simultaneously. Typically the curves are staggered both across the screen and vertically, with 'nearer' curves masking the ones behind. The result is a series of "mountain" shapes that appear to be side by side. The waterfall plot is often used to show how two-dimensional information changes over time or some other variable such as rpm. The term "waterfall plot" is sometimes used interchangeably with "spectrogram" or "Cumulative Spectral Decay" (CSD) plot. ==Uses== Waterfall plots are often used to show the: * results of spectral density estimation, showing the spectrum of the signal at successive intervals of time. * delayed response from a loudspeaker or listening room produced by impulse response testing or MLSSA. * spectra at different engine speeds when testing engines. File:Waterfall plot of a whistle.png|Spectrogram and 3 styles of waterfall plot of a whistled sequence of 3 notes vs time 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Waterfall plot」の詳細全文を読む スポンサード リンク
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