Page 189 - The Master Handbook Of Acoustics

164 CHAPTER SEVEN

has its own decay rate determined by distance traveled, the number of
surfaces involved, the variation of the absorption coefficient of the sur-
faces with angle of incidence, etc. Whatever average decay rate is mea-
sured for an octave of random noise will surely be representative of the
average decay rate at which that octave of speech or music signals
would die away. Although the applicability of computing reverberation
time from the equations based on reverberant field conditions might be
questioned because of the lack of reverberant field, the measured decay
rates (by whatever name you call them) most certainly apply to this
space and to these signals.

Endnotes
1 Beranek, Leo L., Broadcast Studio Design, J. Soc. Motion Picture and Television Eng., 64,
Oct., 1955, 550-559.
2 Schultz, Theodore J., Problems in the Measurement of Reverberation Time, J. Audio Eng.
Soc., 11, 4, 1963, 307-317.
3 Matsudaira, T. Ken, et al., Fast Room Acoustic Analyzer (FRA) Using Public Telephone Line
and Computer, J. Audio Eng. Soc., 25, 3, 1977, 82-94.
4 Mankovsky, V.S., Acoustics of Studios and Auditoria, London, Focal Press, 1971.
5 Schroeder, M.R., New Method of Measuring Reverberation Time, J. Acous. Soc. Am., 37,
1965, 409-412.
6 Peutz, V.M.A., Articulation Loss of Consonants as a Criterion for Speech Transmission in a
Room, J. Audio Eng. Soc., 19, 11, 1971, 915-919.
7 Klein, W., Articulation Loss of Consonants as a Basis for the Design and Judgement of
Sound Reinforcement Systems, J. Audio Eng. Soc., 19, 11, 1971, 920-922.
8 Beranek, L.L., Music, Acoustics, and Architecture, New York, John Wiley & Sons, 1962.
9 Beranek, L.L., Concert and Opera Halls—How They Sound, Woodbury, N.Y., Acoustical
Society of America, 1996.
10 Balachandran, C.G., Pitch Changes During Reverberation Decay, J. Sound and Vibration,
48, 4, 1976, 559-560
11 Spring, N.F. and K.E. Randall, Permissible Bass Rise in Talks Studios, BBC Engineering, 83,
1970, 29-34.
12 Jackson, G.M. and H.G. Leventhall, The Acoustics of Domestic Rooms, Applied Acoustics,
5, 1972, 265-277
13 Hall, Gary, Digital Reverb—How It Works, MIX, 9, 6, 1985, 32.
14 Young, Robert W., Sabine Equation and Sound Power Calculations, J. Acous. Soc. Am., 31,
12, 1959, 1681.