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Underground stations are a common communication situation in towns: we talkwith friends or colleagues, listen to announcements or shop for titbits whilebackground noise and reverberation are challenging communication. Here, weperform an acoustical analysis of two communication scenes in an undergroundstation in Munich and test speech intelligibility. The acoustical conditionswere measured in the station and are compared to simulations in the real-timeSimulated Open Field Environment (rtSOFE). We compare binaural room impulseresponses measured with an artificial head in the station to modeled impulseresponses for free-field auralization via 60 loudspeakers in the rtSOFE. Weused the image source method to model early reflections and a set ofmulti-microphone recordings to model late reverberation. The firstcommunication scene consists of 12 equidistant (1.6 m) horizontally spacedsource positions around a listener, simulating different direction-dependentspatial unmasking conditions. The second scene mimics an approaching speakeracross six radially spaced source positions (from 1 m to 10 m) with varyingdirect sound level and thus direct-to-reverberant energy. The acousticparameters of the underground station show a moderate amount of reverberation(T30 in octave bands was between 2.3 s and 0.6 s and early-decay times between1.46 s and 0.46 s). The binaural and energetic parameters of the auralizationwere in a close match to the measurement. Measured speech reception thresholdswere within the error of the speech test, letting us to conclude that theauralized simulation reproduces acoustic and perceptually relevant parametersfor speech intelligibility with high accuracy.

Communication conditions in virtual acoustic scenes in an underground station