Instantaneous Intensity

Heyser RC. Instantaneous Intensity. In: AES Convention 81. Audio Engineering Society; 1986. Paper 2399. Available from: https://aes.org/publications/elibrary-page/?id=5031

@inproceedings{Heyser1986_5031,
  author = {Heyser, Richard C.},
  title = {{Instantaneous Intensity}},
  booktitle = {AES Convention 81},
  note = {Paper 2399},
  year = {1986},
  month = nov,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=5031}
}

TY  - CPAPER
TI  - Instantaneous Intensity
AU  - Heyser, Richard C.
T2  - AES Convention 81
M1  - Paper 2399
PY  - 1986
DA  - 1986/11/06
UR  - https://aes.org/publications/elibrary-page/?id=5031
PB  - Audio Engineering Society
LA  - en
AB  - 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.
ER  -