Abstract
For the study of sound insulation mechanisms of materials and multiple structure walls, it is necessary to know the oblique incident sound transmission characteristics. Therefore, a new method of measuring oblique incident ransmission loss using complex sound intensity technique have been theoretically investigated. In this method the incident sound power is to be separated from the reflected sound power in front of the specimen by measuring the complex sound intensity and the sound pressure. In order to examine the validity of the method, scale model experiments have been made by using single panel and double walls with and without porous materials in an anechoic room. The results show that it has been found that the oblique incident sound transmission loss could be measured with fairly high accuracy by this method.
