AES Dublin 2019
Poster Session P05
P05 - Poster Session 1
Wednesday, March 20, 15:00 — 17:00 (The Liffey B)
P05-1 Optimized Exciter Positioning Based on Acoustic Power of a Flat Panel Loudspeaker—Benjamin Zenker, Technical University Dresden - Dresden, Germany; Hommbru GmbH - Reichenbach, Germany; Shanavaz Sanjay Abdul Rawoof, TU Dresden - Dresden, Germany; Sebastian Merchel, TU Dresden - Dresden, Germany; Ercan Altinsoy, TU Dresden - Dresden, Germany
Loudspeaker panels, such as distributed mode loudspeakers (DML), are a promising alternative approach in loudspeaker design. DML have many advantages compared to pistonic loudspeakers. However, the frequency response is mostly associated with higher deviations. The position of the excitation is one parameter to optimize the frequency response. An electro-mechanical-acoustical model is presented that enables the optimization of the exciter location, based on the response of the radiated sound power. A simulation model is presented for different surface areas and aspect ratios of the panel. The appropriated positioning and its excitation are discussed based on a single criterion and finally compared with the State of the Art method.
Convention Paper 10144 (Purchase now)
P05-2 Practical Problems in Building Parametric Loudspeakers with Ultrasonic Piezoelectric Emitters—Jose Cadavid, Le Mans Université - Le Mans, France; Antonin Novak, Université du Mans - Le Mans, France
In this paper we deal with some practical issues that one can encounter when building a parametric loudspeaker with ultrasonic piezoelectric emitters. We measured several of those transducers (with resonance frequency 40 kHz) available on the market, observing a strong nonlinear behavior of many of them. We also tested a hundred of piezoelectric emitters of the same series and studied the influence of the standard deviation of the resonance frequency and the sensitivity on the performance of the parametric loudspeaker. We conclude that, when constructing a parametric loudspeaker with low-cost piezoelectric emitters, the individual behavior of each of them should be considered. This allows to minimize the effect of their differences and, thus, improve the quality of the sound generated.
Convention Paper 10145 (Purchase now)
P05-3 Time Stretching of Musical Instrument Tones—Sean O'Leary, Dublin Institute of Technology - Dublin, Ireland
This paper will present an approach to time stretching monophonic sounds such as musical instrument and voice samples. While most time stretching algorithms preserve the pitch of signals, typically they distort some aspects of the temporal evolution—such as onset time, vibrato rate, and random variations in amplitude and frequency. The aim of the time stretching algorithm presented in this paper is to preserve such features of the original signal in the transformed signal.
Convention Paper 10146 (Purchase now)
P05-4 Audio-Driven Multimedia Content Authentication as a Service—Nikolaos Vryzas, Aristotle University of Thessaloniki - Thessaloniki, Greece; Anastasia Katsaounidou, Aristotle University of Thessaloniki - Thessaloniki, Greece; Rigas Kotsakis, Aristotle University of Thessaloniki - Thessaloniki, Greece; Charalampos A. Dimoulas, Aristotle University of Thessaloniki - Thessaloniki, Greece; George Kalliris, Aristotle University of Thessaloniki - Thessaloniki, Greece
In the current paper we present a framework for providing supervisory tools for multimedia Content Authentication As A Service (CAAAS). A double compression method for discontinuity detection in audio signals is implemented and integrated in the provided web service. The user can upload audio/video content or provide links and thereafter, a feature vector is extracted from the audio modality of the selected content for the investigation of discontinuities of the signal via the proposed algorithms. Several visualizations are returned to the user, indicating possible points of forgery in the audio/visual file. Moreover, an audio tampering detection methodology by unsupervised clustering of short-window non-vocal segments, in order to identify differentiations of the acoustic environment of speech signals is presented and evaluated.
Convention Paper 10148 (Purchase now)
P05-5 ANC System Using Secondary Path Modeling Based on Driver’s Position in Vehicle—Seyeong Jang, Hyundai Mobis - Seoul, Korea; Jongin Jung, Hyundai Mobis - Seoul, Korea; Hyungsub Lim, Hyundai Mobis - Seoul, Korea
In this paper we propose a study of active noise control systems using the concept of Secondary Path modeling based on driver position in the vehicle. The system obtains estimates of the Secondary Path within range of occupant location and applies them to the ANC system to compensate for change depending on the driver's position. We used the Offline Secondary Path modeling method and FxLMS algorithm in ANC System. Under assumption of detecting a change in position, the secondary path model is applied according to the occupant position and used as initial value of the ANC system. Therefore, ANC performance is better than a system that does not consider existing changing Secondary Path.
Convention Paper 10149 (Purchase now)
P05-6 Pop and Rock Music Audio Production for 22.2 Multichannel Sound: A Case Study—Will Howie, CBC/Radio-Canada - Vancouver, Canada
Advanced sound capture and mixing techniques, optimized for high channel-count three-dimensional audio reproduction systems, are discussed for pop/rock music production. Based on previous research and experimental recordings, newly developed complex close-microphone arrays are designed to deliver realistic sonic images of musical instruments in terms of physical size and timbre. Combined with multiple ambience microphones, these direct sound arrays can be used to create highly realistic or hyper-realistic sound scenes for 22.2 multichannel sound (9+10+3) reproduction, or other 3D audio formats. A specific case study highlights the aesthetic and technical considerations for production of pop/rock music for advanced audio formats such as 22.2 multichannel sound.
Convention Paper 10150 (Purchase now)
P05-7 University of Victoria Sound Recording Studio Renovation—Bezal Benny, University of Victoria - Victoria, Canada; Kirk McNally, University of Victoria, School of Music - Victoria, BC, Canada
A recent renovation of the sound recording studio at the University of Victoria School of Music represents the first major capital project within the school since its opening in 1968. This case study presents an overview of the project from initial briefing to completion, including discussion of the design opportunities and limitations. Acoustical models used in the design process are presented and used to illustrate the challenges faced when attempting to balance control room performance for both research and teaching purposes.
Convention Paper 10151 (Purchase now)