AES Dublin 2019
Paper Session P16
P16 - Room Acoustics
Friday, March 22, 14:00 — 16:00 (Meeting Room 2)
Ben Kok, BEN KOK - acoustic consulting - Uden, The Netherlands
P16-1 Time-Window Differences Evaluation in a Room Acoustic Sound Field Diffuseness Estimation—Bartlomiej Chojnacki, AGH University of Science and Technology - Cracow, Poland; Mega-Acoustic - Kepno, Poland
Diffusion estimation is an unsolved problem, being identified in many papers for years. One of the most common problems in currently known method is an impulse response time-window used for diffuseness estimation. Different methods for diffuseness estimation will be described, based on estimation of statistical parameters like kurtosis and standard deviation with the discussion on the time-window selection and possible solutions for this problem, considering the so called mixing time problem. This paper will discuss the topic of misunderstanding the term of diffuseness as room acoustic measure, being the introduction to extended diffuseness estimation in multicriteria method.
Convention Paper 10186 (Purchase now)
P16-2 Modal Decay Times in Ducts and Rooms—Roberto Magalotti, B&C Speakers S.p.A. - Bagno a Ripoli (FI), Italy; Valentina Cardinali, B&C Speakers - Bagno a Ripoli, Italy
In order to model the behavior of environments dominated by modal resonances, it is important to find the relationship between modal decay times and boundary conditions. The paper investigates this relationship in simple systems (rectangular duct and room), with a theoretical approach validated by FEM simulations. In the rectangular room, the classification of modes in axial, tangential, and oblique categories is helpful in assessing how the impedance of walls influences decay times. The results are compared to the Sabine equation for reverberation time. Some hints for exploiting experimentally the results are given.
Convention Paper 10187 (Purchase now)
P16-3 How to Prepare Typical Cinema Theater to Become Multipurpose Music Venue—Piotr Kozlowski, Wroclaw University of Science and Technology - Wroclaw, Poland; Pracownia Akustyczna Kozlowski sp. j.
Many small towns or villages can afford to build and maintain only one cultural facility. Such buildings have one hall that must be used to hold various meetings, concerts, performances, lectures, and film screenings. It is well known that individual stage productions have quite different requirements regarding the room acoustic conditions. In order to be able to correctly perform various stage activities in one room, it is necessary to use solutions that adjust the parameters of the room acoustics. The work presents methods for providing flexible acoustics of multipurpose venues. On the example of existing venues, the possibility of adjusting room acoustics of the cinema hall to become a good space for music and theater shows is presented.
Convention Paper 10188 (Purchase now)
P16-4 A Method for Studying Interactions between Music Performance and Rooms with Real-Time Virtual Acoustics—Elliot K. Canfield-Dafilou, Center for Computer Research in Music and Acosutics (CCRMA), Stanford University - Stanford, CA, USA; Eoin F. Callery, CCRMA, Stanford University - Stanford, CA, USA; Jonathan S. Abel, Stanford University - Stanford, CA, USA; Jonathan Berger, CCRMA, Stanford University - Stanford, CA, USA
An experimental methodology for studying the interplay between music composition and performance and room acoustics is proposed, and a system for conducting such experiments is described. Separate auralization and recording subsystems present live, variable virtual acoustics in a studio recording setting, while capturing individual dry tracks from each ensemble member for later analysis. As an example application, acoustics measurements of the Chiesa di Sant’Aniceto in Rome were used to study how reverberation time modifications effect the performance of a piece for four voices and organ likely composed for the space. Performance details, including note onset times and pitch tracks, are clearly evident in the recordings. Two example performance features are presented illustrating the reverberation time impact on this musical material.
Convention Paper 10189 (Purchase now)