Loudspeaker influence on reflection measurements using the Adrienne method

摘要

Measuring the acoustic properties of noise reducing devices is an important prerequisite for efficient noise protection along major transport routes. For the in-situ evaluation of the reflection characteristics of noise barriers, the so-called Adrienne method has been introduced in the European Technical Specification CEN/TS 1793-5. In autumn 2009, acoustic measurements were performed by AIT investigating the influence of different measurement hardware, in particular 2 amplifier/loudspeaker systems, on the reflection properties of the device under test. The measurements were carried out on aluminium noise barriers with a flat surface.