Loading...
Please wait, while we are loading the content...
Similar Documents
Prediction of Reverberation Time in Rectangular Rooms with Non Uniformly Distributed Absorption Using a New Formula
| Content Provider | Semantic Scholar |
|---|---|
| Author | Neubauer |
| Copyright Year | 2001 |
| Abstract | In this paper it will be presented a new formula, i.e. a modified Fitzroy-Kuttruff equation, for estimating the reverberation time in rooms with non uniformly distributed sound absorption. Calculated results are presented comparing different “up-to-date” formulae for the estimated reverberation time as well as for measured data. A modification of Fitzroy’s equation is discussed in this paper and some practical examples are presented which compare predicted and measured values of reverberation time in real rooms. INTRODUCTION It is general known that Sabine’s or Eyring’s formula seriously in error if the sound absorption of the room is unevenly distributed. In 1988 Higini Arau [1] published a paper reporting a new formula for calculation of the reverberation time in rectangular rooms with non uniformly distributed sound absorption. Relating to the work of Fitzroy [2] it will be shown in this paper that the empirical Fitzroy equation can be modified applying Kuttruff’s correction [3] originally related to Eyring’s formula, yielding reverberation times which are close to measured values [4]. A suggested modification of Fitzroy’s equation was first presented in [4] and was further discussed in [5]. Differences between results derived from Fitzroy’s, Sabine’s and Eyring’s equation, as well as from Arau’s formula and others, are compared to those obtained from measurements in real rooms. A CORRECTION TO FITZROY’S FORMULA Fitzroy’s equation [2] assumes the Eyring concept [6] and considers the reverberation time of the room analogous to an area-weighted arithmetical mean of the reverberation time of the three room directions. On the other hand, Kuttruff [3, 7] introduced a correction to the Eyring formula and could show that his correction to the Eyring formula can easily be applied to the case where n-1 surfaces have nearly the same reflection coefficient and one surface, namely the nth surface, e.g. the floor where the audience sits over, a different reflection coefficient shows. His presented results showing a very good agreement with computer simulated results [7]. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.arauacustica.com/files/publicaciones_relacionados/pdf_esp_146.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
