Statistical Parameters of the Frequency Response Curves of Large Rooms

Schroeder MR. Statistical Parameters of the Frequency Response Curves of Large Rooms. J Audio Eng Soc. 1987;35(5):299-306. Available from: https://aes.org/publications/elibrary-page/?id=5208

@article{Schroeder1987_5208,
  author = {Schroeder, Manfred R.},
  title = {{Statistical Parameters of the Frequency Response Curves of Large Rooms}},
  journal = {Journal of the Audio Engineering Society},
  volume = {35},
  number = {5},
  pages = {299--306},
  year = {1987},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=5208}
}

TY  - JOUR
TI  - Statistical Parameters of the Frequency Response Curves of Large Rooms
AU  - Schroeder, Manfred R.
T2  - Journal of the Audio Engineering Society
J2  - J. Audio Eng. Soc.
VL  - 35
IS  - 5
SP  - 299
EP  - 306
PY  - 1987
DA  - 1987/05/06
UR  - https://aes.org/publications/elibrary-page/?id=5208
PB  - Audio Engineering Society
LA  - en
AB  - The following statistical quantities of the frequency response curve of "large rooms" are calculated: the rms response fluctuation, the average height of the maximum, the mean spacing of the zeros (i.e., the intersections of the response curve with the mean level), the mean spacing of the maxima, the mean rate of phase rotation per hertz, and finally the so-called frequence irregularity.: These quantities are exclusively dependent on the reverberation time of the room if certain conditions are met, the only substantial one of them being that the mean spacing of the normal modes is small compared to the half-power width of an individual resonance. This is the case with all large auditoriums, which are not reverberation chambers. In quantitative form the condition to be fulfilled is f >4000 -T/V Hz, where f is the frequency, T Sabine's reverberation time, and V the volume of the room in cubic meters.: Some of the more important results are mean height of the maxima=10 dB, mean spacing of the maxima = 7/T Hz, and frequency irregularity = 1.4T db s.:
ER  -