Investigations on ambient noise reproduction systems for acoustic testing of terminals
The present document provides a collection of investigations on aspects of UE performance in the presence of ambient noise related to the 3GPP terminal testing specifications TS 26.132 [3] and/or performance requirements per TS 26.131 [2].
The evaluation of terminals in conjunction with speech signals and realistic background noise tests as well as performance requirements were added in Release 11 of these specifications. Increased signal processing capabilities facilitated more sophisticated noise reduction functionality in terminals already before this release. However, an incorrect or mistuned device may substantially impact speech quality, intelligibility/listening effort and user experience in general.
The present document focuses on the evaluation of terminals in handset and hands-free mode, but also other related aspects like, e.g., accuracy of noise field simulations are taken into account.