Energy level densities, Hilbert transform
Richard C. Heyser explains how to measure the energy-time response of an acoustic signal by expressing the energy density in a logarithmic form, which he cales the Energy-Time Curve (ETC).
Heyser, Richard C. "The ETC and Instantaneous Intensity" (1982). Richard C. Heyser Collection, College Archives & Special Collections, Columbia College Chicago. http://digitalcommons.colum.edu/cadc_heyser_unpublished/33
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