AES Dublin 2019
Paper Session P21
P21 - Hearing/Perception
Saturday, March 23, 10:30 — 12:00 (Meeting Room 2)
Matteo Torcoli, Fraunhofer IIS - Erlangen, Germany
P21-1 Measurement of Bone-Air Differential Transfer Function Based on Hearing Threshold—Huifang Tang, Key Laboratory of Noise and Vibration Research, Institute of Acoustics, Chinese Academy of Sciences - Beijing, China; Jie Wang, Guangzhou University - Guangzhou, China; Jinqiu Sang, Chinese Academy of Sciences - Beijing, China; Xiaodong Li, Chinese Academy of Sciences - Beijing, China; Chinese Academy of Sciences - Shanghai, China
In this paper the bone-air differential transfer function (BADTF) is defined as the difference between the bone conduction (BC) and the air conduction (AC) transfer functions. This can be equivalent to the bone to air hearing threshold gap when the system is linear. The single ear BADTF was measured at 29 frequencies ranging from 0.5 to 8 kHz with 5 normal hearing subjects. Repeatability of this method was also verified. The results show that there are obvious individual differences but all the curves have similar envelopes. With the BADTF, the individual equalization can significantly improve the performance of the BC reproduction at low frequencies and make the BC sound perceived closer to the target timbre.
Convention Paper 10210 (Purchase now)
P21-2 Calibration of Digital Sound Projectors with Scene Uncertainty —Luke Ferguson, Trinity College Dublin - Dublin, Ireland; Enda Bates, Trinity College Dublin - Dublin, Ireland; Hugh O'Dwyer, Trinity College - Dublin, Ireland; Sebastian Csadi, Trinity College Dublin - Dublin, Ireland; Francis M. Boland, Trinity College Dublin - Dublin, Ireland
This paper addresses the calibration problem for digital sound projection in the context of uncertain scene geometry. The image method is extended to handle uncertainties in the description of reflectors, specifically the distance parameter, relative to the source and/or receiver. Under the assumption that the source is a linear array of loudspeakers parallel with the back wall of a rectangular room, a novel extended image method is applied to compute probability distributions for the beamforming parameters for digital sound projection. The calibration is enriched with information available from probability distributions of the planar reflectors in the scene. Computer simulations are conducted to validate the calibration accuracy and to evaluate the performance of system. The expected deviation from optimum performance is quantified by analyzing the expected soundfield at the receiver position. This paper also highlights the sensitivity of digital sound projectors to measurement errors under certain constrained conditions.
Convention Paper 10211 (Purchase now)
P21-3 Perception of Auditory Events in Scenarios with Projected and Direct Sound from Various Directions—Tom Wühle, TU Dresden, Lehrstuhl für Akustik und Haptik - Dresden, Germany; Sebastian Merchel, TU Dresden - Dresden, Germany; Ercan Altinsoy, TU Dresden - Dresden, Germany
Sound projecting audio systems realize the reproduction of sound from different directions via re?ections paths using highly focusing sound sources. However, the limited focusing capabilities of real sources, e.g., loudspeaker arrays, cause the perception of the listener in practice to be in?uenced by direct sound in addition to the projected sound. This study dealt with the separation of auditory events caused by increasing perceptual dominance of the leading direct sound in sound projection. For that, the perception of auditory events for different directions of direct and projected sound and increasing direct sound level was evaluated. The separation varied with the different directions of direct and projected sound. The effect of sound projection, however, was not in?uenced.
Convention Paper 10212 (Purchase now)