AES Dublin 2019
Paper Session P03
P03 - Loudspeakers: Part 2
Wednesday, March 20, 14:30 — 16:30 (Meeting Room 2)
Chair:
Alexander Voishvillo, JBL/Harman Professional Solutions - Northridge, CA, USA
P03-1 Green Speaker Design (Part 1: Optimal Use of System Resources)—Wolfgang Klippel, Klippel GmbH - Dresden, Germany
Increasing the efficiency and voltage sensitivity of the electro-acoustical conversion is the key to modern audio devices generating the required sound output with minimum size, weight, cost, and energy. Traditional loudspeaker design sacrifices efficiency for sound quality. Nonlinear adaptive control can compensate for the undesired signal distortion, protect the transducer against overload, stabilize the voice coil position, and cope with time-varying properties of the suspension. The paper presents a new design concept for an active loudspeaker system that uses the new degree of freedom provided by DSP for exploiting a nonlinear motor topology, a soft suspension and modal vibration in the diaphragm, panel, and in the acoustical systems.
Convention Paper 10138 (Purchase now)
P03-2 Green Speaker Design (Part 2: Optimal Use of Transducer Resources)—Wolfgang Klippel, Klippel GmbH - Dresden, Germany
Green speaker design is a new concept for developing active loudspeaker systems that generate the required sound output with minimum size, weight, cost, and energy. This paper focuses on the optimization of the transducer by exploiting the new opportunities provided by digital signal processing. Nonlinear adaptive control can compensate for the undesired signal distortion, protect the transducer against overload, stabilize the voice coil position, and cope with time varying properties of the suspension. The transducer has to provide maximum efficiency of the electroacoustical conversion and sufficient voltage sensitivity to cope with the amplifier limitations. The potential of the new concept is illustrated on a transducer intended for automotive application.
Convention Paper 10139 (Purchase now)
P03-3 DSP Loudspeaker 3D Complex Correction—Victor Manuel Catala Iborra, DAS Audio - Fuente Del Jarro, Spain; The University of Salford - Salford, UK; Francis F. Li, University of Salford - Salford, UK
An advantageous approach to DSP equalization of loudspeakers is proposed in this paper adopting spatial averages of complex responses acquired from 3D balloon measurements. Alignment of the off-axis impulses responses with the on-axis impulse responses are accomplished using a cross-correlation technique prior to spatial averaging to attain meaningful statistics of magnitude and phase responses. This is performed over a pre-defined listening window from the complete loudspeaker response balloons (both magnitude and phase). The resulted average of the complex response within a suitably defined listening window is used to obtain, via the least mean square adaptive technique, an inverse filter that corrects the linear behavior of the loudspeaker.
Convention Paper 10140 (Purchase now)
P03-4 Poster Introductions 3—N/A
The purpose of Poster Introductions at the end of certain paper sessions is to give the poster authors a chance to briefly outline what is in their paper and encourage people to come to their poster session and ask questions.
• Investigation into How Reference Sources and the Experience of Technical Ear Training Work in Mixing through Headphones—Soohoon Park; Toru Kamekawa; Atsushi Marui
• Proposal of Power-Saving Audio Playback Algorithm Based on Auditory Masking—Mitsunori Mizumachi; Tsukasa Nakashima; Mitsuhiro Nakagawara
• Localization of Natural Sound Sources at Various Azimuth and Elevation Angles—Maksims Mironovs; Hyunkook Lee