Synchronized Swept-Sine: Theory, Application, and Implementation - October 2015
Effect of Microphone Number and Positioning on the Average of Frequency Responses in Cinema Calibration - October 2015
The Measurement and Calibration of Sound Reproducing Systems - July 2015
Using an energy theorem first published in the Journal in 1971, and reconsidering sound pressure and particle velocity as components of a 4-dimensional space-time vector, results in the prediction of a complex intensity whose components are related through the Hilbert operator. This intensity vector has an instantaneous time dependence. The conventional time average of the product of sound pressure and particle velocity gives incorrect answers for anything but a steady tone and is not much use in dynamic sound measurements. The energy-time curve (ETC) is a valid measure of instantaneous intensity.
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