A first experimental comparison between the Schroeder’s backintegration method and a new method based on sound intensity for measuring reverberation time.

Abstract

A new method based on the experimental evaluation of the energy transfer function of an enclosed space from sound intensity measurements has been experimentally compared with the well-known method of measuring reverberation time due to Schroeder [M. R. Schroeder, J. Acoust. Soc. Am. 37, 409–412 (1965)]. The measurements of active and reactive sound intensity were carried out by a B&K 2133 real time frequency analyzer and the reverberation time was computed using the built-in reverbBack user defined function over a pressure input multispectrum. As the transfer function is simply related to the reverberation time through an Eyring-like formula [D. Stanzial, J. Acoust. Soc. Am. Suppl. 1 88, S185 (1990)] the comparison gives a first experimental confirmation of the intensimetric approach to reverberation time evaluation.