PROGRAMM - DAGA 2012

Programm DAGA 2012 107mit der gleichen spektralen Selektivität bei der monauralen und binauralenVorverarbeitung würde hingegen eine nahezu lückenbreitenunabhängigeIPD-Schwelle vorhersagen. Die Daten stehen im Einklang mitder Annahme einer effektiv reduzierten spektralen Selektivität des binauralenSystems.Di. 17:20 aurum 2.07 Psychoakustik 1Speech intelligibility in cocktail parties: the contribution of binauralcues to perceptual stream formationE. Schoenmaker und S. van de ParUniversität Oldenburg, Institut für Physik - AkustikA cocktail party with one target speaker and two interfering speakerswas simulated in a head phone experiment where each speaker waspresented with a different Interaural Time Delay (ITD). Speech sampleswere presented that consisted of a sequence of six vowel-consonantvowel(vcv) logatomes from the OLLO database. For the target speaker,only one of the last three logatomes differed from the others; for the interferingspeakers, all logatomes were different. Listeners were askedto attend to the voice of a target speaker and report the logatome thatwas different. Five conditions were used that differed with respect tothe ITDs such that they were either kept constant over the sequence orchanged after each logatome. In three measurement conditions, eithertarget or interferer or both streams were presented with varying ITDs,while the remaining streams were presented with a fixed ITD. In two referenceconditions all ITDs were fixed for all speakers. The three speechstreams were presented with either the same or different ITDs. Resultswill be discussed that address the importance of consistent ITD cues inperceptual stream formation and its effect on speech intelligibility.Di. 17:45 aurum 2.07 Psychoakustik 1Lateralization of a Coherent Noise Source within Diffuse BackgroundNoise using Interaural Level DifferencesD. Reed und S. van de ParUniversität Oldenburg, Institut für Physik - AkustikIn complex auditory environments the primary binaural cues used for localizationof acoustic objects on the horizontal plane are distorted due tobackground noise and reverberation. Depending on the signal-to-noiseratio (SNR), the aggregate interaural level difference (ILD) for the sourceand noise is systematically shifted from the ILD of the desired soundsource. The research presented here evaluates the perceived lateralizationof distorted ILD cues due to background noise. Using a shortcoherent noise burst without background noise as an acoustical pointer,listeners indicated the perceived position of the coherent target bursttemporally centered within a longer diffuse noise interval. Preliminaryresults show that the ability to correctly lateralize the target stimuli withinthe background noise is dependent upon the individual’s detection