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Waterfall plots are often used to show how two-dimensional phenomena change over time. A three-dimensional ''spectral waterfall plot'' is a 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
Typical engine vibration waterfall
Waterfall FFT Matlab script
{{DEFAULTSORT:Waterfall Plot Plots (graphics) Audio engineering Broadcast engineering Sound production technology Sound recording Acoustics
Waterfall plots are often used to show how two-dimensional phenomena change over time. A three-dimensional ''spectral waterfall plot'' is a 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 rotational speed
Rotational frequency, also known as rotational speed or rate of rotation (symbols ''ν'', lowercase Greek nu, and also ''n''), is the frequency of rotation of an object around an axis.
Its SI unit is the reciprocal seconds (s−1); other com ...
. Waterfall plots are also often used to depict ''spectrogram
A spectrogram is a visual representation of the spectrum of frequencies of a signal as it varies with time.
When applied to an audio signal, spectrograms are sometimes called sonographs, voiceprints, or voicegrams. When the data are represen ...
s'' or ''cumulative spectral decay'' (CSD).
Uses
* The results ofspectral density estimation
In statistical signal processing, the goal of spectral density estimation (SDE) or simply spectral estimation is to estimate the spectral density (also known as the power spectral density) of a signal from a sequence of time samples of the signal ...
, showing the spectrum of the signal at successive intervals of time.
* The delayed response from a loudspeaker
A loudspeaker (commonly referred to as a speaker or, more fully, a speaker system) is a combination of one or more speaker drivers, an enclosure, and electrical connections (possibly including a crossover network). The speaker driver is an ...
or listening room produced by impulse response
In signal processing and control theory, the impulse response, or impulse response function (IRF), of a dynamic system is its output when presented with a brief input signal, called an impulse (). More generally, an impulse response is the reac ...
testing or MLSSA.
* Spectra at different engine speeds when testing engines.
See also
* Loudspeaker acoustics *Loudspeaker measurement
A loudspeaker (commonly referred to as a speaker or, more fully, a speaker system) is a combination of one or more speaker drivers, an enclosure, and electrical connections (possibly including a crossover network). The speaker driver is an ...
References
External links
Typical engine vibration waterfall
Waterfall FFT Matlab script
{{DEFAULTSORT:Waterfall Plot Plots (graphics) Audio engineering Broadcast engineering Sound production technology Sound recording Acoustics