Last Updated: 20050512, tendelooSaturday, May 28, 14:00 — 16:00
Chair: Tim Nind, Harman/Becker Automotive Systems - Bridgend, UK
D-1 Automotive Doors as Loudspeaker Enclosures Modeling Considerations—Roger Shively, Josh King, Harman Becker Automotive Systems, Inc. - Martinsville, IN, USA; Nolen Ryba, Michigan Technical University - Houghton, MI, USA
A study of automotive doors as loudspeaker enclosures was previously presented. Considerations for modeling the mechanical and acoustical behavior of automotive doors are now presented. Theoretical mathematical models and computer modeling considerations for modeling the mechanical-acoustic behavior of automotive doors as loudspeaker enclosures are presented. The goal for the models is to predict the mechanical dynamic behavior and consequently the impedance and frequency response of the loudspeaker door enclosure. Modeled results would be used to compare to impedance and frequency response measurements of several doors. This modeling further investigates a methodology for quantifying door enclosures and refines the criteria for qualifying automotive doors as loudspeaker enclosures.
Convention Paper 6357 (Purchase now)
D-2 A Listening Test System for Automotive Audio—Part 1: System Description—Flemming Christensen, Aalborg University - Aalborg, Denmark; Geoff Martin, Bang & Olufsen a/s - Struer, Denmark; Pauli Minnaar, AM3D A/S - Aalborg, Denmark; Woo-Keun Song, Benjamin Pedersen, Aalborg University - Aalborg, Denmark; Morten Lydolf, Bang & Olufsen a/s - Struer, Denmark
This paper describes a system for simulating automotive audio through headphones for the purposes of conducting listening experiments in the laboratory. The system is based on binaural technology and consists of a component for reproducing the sound of the audio system itself and a component for reproducing the background noise in the cabin. The former is implemented by measuring binaural room impulse responses (with a head-and-torso-simulator equipped with a computer-controlled rotating head) and employing them in binaural synthesis. The latter is implemented by recording the cabin noise (with the artificial head rotated to various positions) and reproducing the recordings through headphones. During playback the listener’s head is tracked and both the binaural synthesis and binaural recordings are updated accordingly in real time.
Convention Paper 6358 (Purchase now)
D-3 A Listening Test System for Automotive Audio—Part 2: Initial Verification—Søren Bech, Bang & Olufsen a/s - Struer, Denmark; Mehmet-Ali Gulbol, Aalborg University - Aalborg, Denmark; Geoff Martin, Bang & Olufsen a/s - Struer, Denmark; Jody Ghani, Wolfgang Ellermeier, Aalborg University - Aalborg, Denmark
This paper describes two listening tests that were performed to provide initial validation of an auralization system (see Part 1) to mimic the acoustics of a car interior. The validation is based on a comparison of results from an in–car listening test and another test using the auralization system. The music samples for the test were chosen from a database of various codec examples from a previous extensive ITU test to validate the ITU–R BS.1387–1 standard. The results show that the auralization system is able to preserve and transmit a subjective impression of the sound field in a car to such a degree that mean ratings of the basic audio quality obtained with the system, for the tested items, are not significantly different from those obtained in the real car environment.
Convention Paper 6359 (Purchase now)
D-4 Attribute Identification and Quantification in Automotive Audio—Part 1: Introduction to the Descriptive Analysis Technique—Geoff Martin, Søren Bech, Bang & Olufsen a/s - Struer, Denmark
Although many commonly-accepted paradigms exist for perceptual testing of automotive audio systems, it has yet to be reliably determined which auditory attributes should be tested. This paper gives an introduction to the descriptive analysis technique for determining and quantifying the constituent perceptual attributes of signals produced by a sound playback system in an automotive environment.
Convention Paper 6360 (Purchase now)
©2005 Audio Engineering Society, Inc.