4.2.2 Nominal System Sensitivity in Receive Direction for Channel-based audio

26.2603GPPObjective test methodologies for the evaluation of immersive audio systemsRelease 18TS Introduction

This test is applicable to UEs rendering channel-based audio (e.g. 7.1.4) over a binaural headset. Definition

The nominal system sensitivity in receive direction for channel-based audio is defined as the difference between the sound pressure level (in dBSPL(A)) produced by the DUT on HATS and the root mean square of the digital test signal (in dBFS). Test Conditions

Test environment noise floor

The equivalent continuous sound level of the test environment in each 1/3rd octave band, Leq(f), shall be less than the limits of the NR10 curve, following the noise rating determination procedures in [4].

The specific HATS used for the recording shall be described in the test report. The set of HRTFs used by the UE shall be documented and available to the test lab. Measurement

For each audio channel supported by the DUT, a pink noise signal with -18 dBFS RMS level is played, with the signals played only one channel at a time.

The LAeq (in dBSPL(A)) is measured continuously for a period of 30 s for each of the left and right ears.

The sensitivity Gi L,R is expressed as the difference of the recorded sound pressure levels at the left and right ears and the root mean square digital level of the pink noise test signal, i.e. -18 dBFS.