Saturday, October 1, 1:30 pm — 3:00 pm (Rm 403A)
Sean Olive, Harman International - Northridge, CA, USA
P20-1 Listener Perceptual Threshold for Image Shift Caused by Channel Delays in Stereo Audio—Elisabeth McMullin, Samsung Research America - Valencia, CA USA
To determine a threshold for listener perception of image shift caused by imperfectly synchronized stereo signals, a series of experiments using method of adjustment and ABX procedures was run over headphones and loudspeakers. Listeners adjusted an endless knob to vary delays between the stereo channels of music programs in search of a centered stereo image. The results demonstrated that 9 out of 10 listeners could reliably detect delays between loudspeaker or headphone channels at levels of 0.06 ms or lower. Furthermore, when centering a stereo image 95% of all listener adjustments were under 0.16 ms for headphones and 0.22 ms for loudspeakers. Many variables that may have affected the experiments are explored, including hearing balance, program material, and listening environments.
Convention Paper 9663 (Purchase now)
P20-2 Phantom Image Elevation Explained—Hyunkook Lee, University of Huddersfield - Huddersfield, UK
A subjective experiment was conducted to identify frequency bands that produce the effect of phantom image elevation. Subjects judged the perceived image regions of phantom center images for a broadband pink noise burst and its octave bands with seven different loudspeaker base angles. The 500 Hz and 8 kHz bands were found to be the most effective bands for the perception of above image with the base angle of 180°. The role of acoustic crosstalks for the elevation effect was also examined using binaural stimuli created for the 180° angle. It was found that the elevation effect was significantly reduced when the crosstalks were removed or their delay times were manipulated to 0 ms. Furthermore, the low frequency component of the crosstalk was found to produce greater elevation and externalization effects than the high frequency component.
Convention Paper 9664 (Purchase now)
P20-3 Validation of a Perceptual Distraction Model in a Complex Personal Sound Zone System—Jussi Rämö, Aalborg University - Aalborg, Denmark; Bang & Olufsen - Struer, Denmark; Steven Marsh, University of Surrey - Guildford, Surrey, UK; Søren Bech, Bang & Olufsen a/s - Struer, Denmark; Aalborg University - Aalborg, Denmark; Russell Mason, University of Surrey - Guildford, Surrey, UK; Søren Holdt Jensen, Aalborg University - Aalborg, Denmark
This paper evaluates a previously proposed perceptual model predicting user's perceived distraction caused by interfering audio programs. The distraction model was originally trained using a simple sound reproduction system for music-on-music interference situations and it has not been formally tested using more complex sound systems. A listening experiment was conducted to evaluate the performance of the model, using music target and speech interferer reproduced by a complex personal sound-zone system. The model was found to successfully predict the perceived distraction of a more complex sound reproducing system with different target-interferer pairs than it was originally trained for. Thus, the model can be used as a tool for personal sound-zone evaluation and optimization tasks.
Convention Paper 9665 (Purchase now)