Audio frequency, Auditory perception, Sound--Measurement, Special relativity (Physics)
In this paper, Richard C. Heyser explains the theories behind measuring sound by discussing its energy. Using what he calls abstract geometry, Heyser argues that measuring the transfer properties (that is, pressure and velocity) of sound's energy aids in the discovery of its amplitude and phase (or in-phase and quadrature).
Heyser, Richard C. "The Two Parts of Energy" (1980). Richard C. Heyser Collection, College Archives & Special Collections, Columbia College Chicago. http://digitalcommons.colum.edu/cadc_heyser_unpublished/31
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