In situ calibration of the sound strength parameter G

Abstract

The room acoustic parameter “strength of sound G” is a measure of room amplification relative to a 10 m free-field reference. Due to this reference requirement, G is often considered excessively difficult to measure. Standards require reference measurements using reverberation or anechoic chambers. While possible for well-equipped laboratories, this is impractical for most practitioners. Considering the entire measurement chain, stability of amplifier and converter gains must be identical between on-site and calibration measurements, which cannot always be assured. An in situ calibration method is proposed, taking advantage of the full hall dataset. Results show significant advantages compared to previous methods.