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AES Amsterdam 2008
Poster Session P24

P24 - Room and Architectural Acoustics & Sound Reinforcement

Tuesday, May 20, 09:30 — 11:00
P24-1 Objective Evaluation of a Non-Environmental Control Room for 5.1 Surround ListeningSoledad Torres-Guijarro, Laboratorio Oficial de Meroloxía de Galicia (LOMG) - Tecnópole, Ourense, Spain; Antonio Pena, Norberto Degara-Quintela, Universidad de Vigo - Vigo, Spain
The control room of the Universidad de Vigo was built for the purpose of assessing small audio artifacts, such as listening analytically to coded material with different data rates. It follows a non-environment design that minimizes the influence of the room. The use of such a room as a 5.1 surround listening room will be analyzed according to international recommendations. This research includes the study of the electro-acoustic behavior of loudspeakers, geometric and acoustic properties of the room, and sound field conditions. A discussion of some divergences and implications for its use when performing surround listening tests follows the measurement results.
Convention Paper 7465 (Purchase now)

P24-2 A Case Study of Sound Reproduction and Acoustic Enhancement in Concert Halls Using Wave Field SynthesisClemens Kuhn-Rahloff, Matthias Rosenthal, Max Casdorff, Roger Moser, sonic emotion ag - Obergltt (Zurich), Switzerland
This paper presents the wave fields synthesis system under construction at the National Conservatory of Music Detmold (Germany). The system is dedicated to sound reproduction for artistic purposes at the Tonmeister department (Erich Thienhaus Institute) and to an enhancement of room acoustics. The system comprises 346 independent loudspeaker channels, including a horizontal loudspeaker array all around the auditory (500 seats) and ceiling loudspeakers. Since the hall is used for a broad repertoire comprising chamber music, romantic orchestra instrumentations, organ concerts, contemporary music, etc., the hall will be equipped with a variable room acoustic system. The paper presents perceptual aspects of system design concerning the direct sound and diffuse field as well as practical implementations for WFS rendering.
Convention Paper 7466 (Purchase now)

P24-3 Small Studios with Gypsum Board Sound Insulation: A Review of Their Room Acoustics, Details at the Low FrequenciesLorenzo Rizzi, Francesco Nastasi, Rizzi Acustica - Lecco LC, Italy
At the present time most music preproduction and production is often carried out in very small, privately owned rooms, which are called “project studios.” Gypsum board technology is very common in the construction of these rooms because of its high insulation capabilities compared to low monetary and time costs. The paper discusses sweet spot impulse response measurements that have been carried out in three different but acoustically small rooms built with gypsum board sound insulating structures comparing it to a masonry built one. The room modal behavior is underlined, continuing with the analysis of decaying in time at low frequencies related to insights on perception and analysis. A different methodology of study is proposed.
Convention Paper 7467 (Purchase now)

P24-4 On the Measurement of Electro Acoustic Enhanced Sound FieldsFlorian Walter, Mueller-BBM GmbH - Munich, Germany; Frank Melchior, Fraunhofer Institute for Digital Media Technology - Ilmenau, Germany
The installation and optimization of acoustic enhancement systems require a large amount of experience. The verification in terms of measurement is most of the time done using conventional reverberation and acoustic parameter measurements according to ISO 3382. This is a good solution for diffuse sound analysis and general examination of early reflections, but in terms of direction dependant analysis the results are not satisfying. In this paper a room equipped with an acoustic enhancement system was measured using a circular array. The effects of adding specific early reflections and direction-dependent diffuse energy generated by the acoustic enhancement system are investigated. The results are compared to standard measurements according to ISO 3382.
Convention Paper 7468 (Purchase now)

P24-5 Applying Cochlear Modeling and Psychoacoustics in Room AcousticsJasper van Dorp Schuitman, Diemer de Vries, Delft University of Technology - Delft, The Netherlands
The acoustical qualities of a concert hall or any other room are generally expressed using acoustical parameters. These parameters are determined from impulse responses, as measured from single positions in a room or along a line array. However, from array measurements it turned out that parameters can fluctuate severely between small distance steps, something which does not agree with human perception. Applying cochlear modeling and psychoacoustics in this process seems a promising technique to reach results that do not suffer from these fluctuations and thus are much closer to human perception compared with conventional techniques.
Convention Paper 7469 (Purchase now)

P24-6 Empirical Evaluation of the Frequency-Dependent Boundary Conditions in a Digital Waveguide MeshJosé Escolano, University of Jaén - Linares, Jaén, Spain; Basilio Pueo, University of Alicante - Alicante, Spain; José J. López, Máximo Cobos, Technical University of Valencia - Valencia, Spain
The digital waveguide mesh is a popular method for time domain acoustic system simulation such as room acoustics. One of the main reasons to choose this paradigm relies in the ease to include boundary conditions in the simulation. This paper is focused on the comparison of the simulation with real-world measurements, where a particular scenario is physically built and the corresponding simulation, according to their physical parameters, is carried out. The main scope of this paper is the validation and discussion of a boundary condition model and their correspondence with the measurements through an example.
Convention Paper 7470 (Purchase now)

P24-7 Subjective Effects of Dispersion in the Simulation of Room Acoustics Using Digital Waveguide MeshJose J. Lopez, Technical University of Valencia - Valencia, Spain; José Escolano, University of Jaén - Linares (Jaén), Spain; Maximo Cobos, Technical University of Valencia - Valencia, Spain; Basilio Pueo, University of Alicante - Alicante, Spain
The simulation of room acoustics using the Digital Waveguide Mesh method has gained interest in the last few years. One of the problems of this method is the frequency and angle dependent dispersion. In order to reduce this effect, an oversampling is usually employed but at the cost of highly increasing the resulting computational cost and restricting the simulation to lower frequencies. In this paper a subjective analysis is carried out; where different oversampling factors in voice band simulations have been performed and evaluated by a set of listeners. Some listening tests employing ABX methodology have been used to evaluate the subjective effects, obtaining some preliminary results that, although not being conclusive, they represent a first approach to the problem.
Convention Paper 7471 (Purchase now)

Last Updated: 20080612, tendeloo