AES Milan 2018
Paper Session P15
P15 - Measurements
Thursday, May 24, 16:30 — 18:00 (Scala 2)
John Mourjopoulos, University of Patras - Patras, Greece
P15-1 Comparison of Effectiveness of Acoustic Enhancement Systems—Comparison of In-Line, Regenerative, and Hybrid-Regenerative Enhancement Methods—Takayuki Watanabe, Yamaha Corp. - Hamamatsu, Shizuoka, Japan; Dai Hashimoto, Yamaha Corp. - Hamamasatsu, Japan; Hideo Miyazaki, Yamaha Corp. - Hamamatsu, Shizuoka, Japan; Ron Bakker, Yamaha Commercial Audio Systems Europe - Rellingen, Germany
Acoustic enhancement systems have become popular in recent years and are broadly used in various kinds of facilities because of their acoustic naturalness and system stability. Today, demand for acoustic enhancement systems exists not only for multi-purpose halls but also for highly absorptive spaces, especially lecture halls and theaters. To investigate an effective enhancement system for highly absorptive spaces, we compared several enhancement methods that are commonly applied in a small auditorium. This paper summarizes the features and the acoustical characteristics of systems configured according to each of the considered enhancement methods in the small auditorium.
Convention Paper 9974 (Purchase now)
P15-2 Comparison of Methods for Estimating the Propagation Delay of Acoustic Signals in an Audience Service for Live Events—Marcel Nophut, Leibniz Universität Hannover - Hannover, Germany; Robert Hupke, Leibniz Universität Hannover - Hannover, Germany; Stephan Preihs, Leibniz Universität Hannover - Hannover, Germany; Jürgen Peissig, Leibniz Universität Hannover - Hannover, Germany
Our novel audience service for live events uses supplementary audio content presented through transparent headphones to enhance the traditional audio playback of a PA loudspeaker system. The service requires to estimate the propagation delay of sound waves from the PA loudspeakers to the listener in order to individually delay the supplementary audio content and temporally align it with the PA playback. This paper compares two different correlation-based methods regarding their computational complexity and their performance in estimating the above mentioned time delay using realistic recordings of music and speech samples. Additional measures, that make the estimation more robust, were developed and are also presented. Typical issues like tonal components, room reflections, crosstalk, and a large number of correlation lags are addressed.
Convention Paper 9975 (Purchase now)
P15-3 Experimental Results on Active Road Noise Cancellation in Car Interior—Carlo Tripodi, Ask Industries S.p.A. - Montecavolo di Quattrocastella (RE), Italy; Alessandro Costalunga, Ask Industries S.p.A. - Montecavolo di Quattrocastella (RE), Italy; Lorenzo Ebri, Ask Industries S.p.A. - Montecavolo di Quattrocastella (RE), Italy; University of Parma - Parma (PR), Italy; Marco Vizzaccaro, ASK Industries SPA - Montecavolo di Quattrocastella (RE), Italy; Luca Cattani, Ask Industries S.p.A. - Montecavolo di Quattrocastella (RE), Italy; Emanuele Ugolotti, Ask Industries S.p.A. - Montecavolo di Quattrocastella (RE), Italy; Tiziano Nili, Ask Industries S.p.A. - Montecavolo di Q.Castella(RE), Italy
We discuss the implementation and the performance of an active road noise control system. We review the design of a system based on the Least Mean Square (LMS) adaptive algorithm, suitable for the wideband road noise reduction inside a car cabin. As the system is based on a feedforward control approach, we discuss the method for the selection of the sensors providing the best noise reference signals. We then give a computational complexity analysis of the overall system and discuss the system implementation into a prototype hardware for a mid-size sedan. Performance are then evaluated on different road noise scenarios in real driving situations.
Convention Paper 9976 (Purchase now)