Improving the Intelligibility of Aircraft PA Systems
A survey carried out by the authors on a range of commercial Jet Aircraft whilst in normal flight, found a wide variation in perceived intelligibility and operational signal to noise ratios of their on-board PA systems. Typical passenger cabin background noise levels of 80-85 dBA (100 -105 dBC) were recorded, whilst many systems were found to operate with either zero or negative S/N ratios. The results of extensive mock up testing are reported. It is shown that high frequency dispersion is a major factor contributing to the perceived intelligibility. The use of Distributed Mode Loudspeaker technology was found to bring about significant improvements in clarity & intelligibility but the effectiveness of Rasti as an accurate intelligibility descriptor under these conditions is questioned.
Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members, $5 for AES members and is free for E-Library subscribers.