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Session J Monday, May 14 8:30 - 13:00 hr Room C/D

Room Acoustics & Sound Reinforcement

Chair: Rinus Boone, Technical University Delft, Delft, The Netherlands

8:30 hr J-1
A Networked Sound Reinforcement and Announcement System for the 2000 Sydney Olympic Games
Neil Packer
Creative Audio, Windsor, Australia

A permanent large scale audio system for sound reinforcement and zoned announcements was installed in the 760 Hectare (1900 acre) Sydney Olympic Park precinct, the site of 14 major venues for 2000 Olympic Games events. During the Games, up to 450,000 people were present on the site at any time. Around the site, 550 distributed loudspeakers are driven from 56 adjacent dual channel amplifiers. Networked digital audio directly accesses loudspeaker amplifiers, carried across the site on both optic-fiber and copper data links. The paper discusses benefits of this approach, including flexible signal routing, distributed signal processing, direct to network digital message play-out and centralized or local control alternatives.
Paper 5350

9:00 hr J-2
Sound Conditioning and Acoustical Sound Design for Office Working Places
Ernst-Joachim Voelker & Wolfgang Teuber
Institut f¸r Akustik und Bauphysik, Oberursel, Germany

The office sound in open spaces can be consequently designed to obtain confidence and acceptance. The improvement of listening conditions includes the avoidance of interfering speech from adjacent working places, disturbing noise from computers or telephones, sound from air conditioning outlets, or noise from photocopy machines. Sound design is defined as the build up of a pleasant and well accepted soundfield within the office area. The tools implemented are absorption, distance and desk orientation combined with artificial ambient noise for masking purposes. A field of confidence can be found within limits of acceptance. Beyond these limits, disadvantages occur with the consequence of negative judgments and rejections. The limits are sometimes so strong that little adjustments must be made and overcome with other measures. Some open-planned offices need to be continuously monitored, checking the important influencing factors. The goal is privacy for every office working place with different privacy requirements. A scale of privacy exists and must be used properly.
Paper 5351

9:30 hr J-3
Merging Software for Sound Reinforcement Systems and for Room Acoustics
Wolfgang Ahnert (1), Stefan Feistel (1), Oliver Schmitz (1) & Michael Vorl”nder (2)
(1) ADA Acoustic Design Ahnert, Berlin, Germany
(2) Institut f¸r Technische, Berlin, Germany

The combination of a well-known electro acoustical simulation software with a state-of-the-art room acoustical simulation engine merging the advantages of both to form a multi-purpose simulation tool, is introduced. The new tool is useful for consultants for application in complex situations in medium sized and large rooms. Advantages of combining a high quality speaker database and a powerful 3D-CAD interface with a hybrid image source/ray tracing algorithm including diffuse scattering will be discussed. Details about the room acoustical model and its limitations as well as the extended possibilities of the system are the main topics of this paper.
Paper 5352

10:00 hr J-4
Determining Optimum Room Dimensions for Critical Listening Environments: A New Methodology
Trevor Cox (1) & Peter D'Antonio (2)
University of Salford, Manchester, UK
RPG Diffusor Systems, Upper Marlboro, MD, USA

Modes in small rooms may lead to uneven frequency responses and extended sound decays at low frequencies. In critical listening environments this often causes unwanted coloration effects, which can be detrimental to the sound quality. Choosing an appropriately proportioned room may reduce the audible effects of modes. This paper details a new methodology for determining the room dimensions for small critical listening spaces. It is based on numerical optimization of the room dimensions to achieve the flattest possible frequency response. The method is contrasted with previous techniques.
Paper 5353

10:30 hr J-5
Extraction of Speech Transmission Index from Speech Signals using Artificial Neural Networks
Francis Li & Trevor Cox
University of Salford, Manchester, UK

This paper presents a novel method to extract Speech Transmission Index (STI) from reverberated speech utterances using an artificial neural network. The convolutions of anechoic speech signals and simulated impulse responses of rooms of various kinds are used to train the artificial neural network. A time to frequency domain transformation algorithm is proposed as the pre-processor. A multi-layered feed forward neural network trained by back-propagation is adopted. Once trained, the neural network can accurately estimate Speech Transmission Index from speech signals received by a microphone in rooms. This approach utilizes a naturalistic sound source, speech, and hence has potential to facilitate occupied measurement.
Paper 5354

11:00 hr J-6
Phase Presentation in the Acoustic Design Program EASE
Wolfgang Ahnert, Cedirc Bourillet & Stefan Feistel
ADA Acoustic Design Ahnert, Berlin, Germany

New speaker designs use active phase shifts to optimize line or plane arrays for better directivity control of the device. To simulate these new speakers in EASE the phase information of such a system must be measured and stored. Also, in case that measured data is not available, EASE will calculate phase data assuming minimum phase behavior. EASE for Windows saves these sets of complex data and allows to present phase balloons in a wrapped or unwrapped form. A new cluster routine shows the resulting balloons of complex arrays in magnitude and phase. Special post processing allows to examine the phase data in many different ways to distinguish real physical phase jumps from mathematical ones only caused by phase wraps.
Printed Paper not available

11:30 hr J-7
The Wave Field Analysis and Synthesis of an Acoustic Field in Rooms using the Concept of a Direction of Arrival Algorithm
Krzysztof Passella (1), Andrzej Dobrucki (2), Bayan Sharif (1) & Oliver Hinton (1)
 University of Newcastle-upon-Tyne, Newcastle-upon-Tyne, UK
 Wroclaw University of Technology, Wroclaw, Poland

This paper is a proposal for an extension of the WFS method towards a new direction in adaptive sound reinforcement systems. The positions of sound sources may be found using array signal processing techniques. Analysis of an acoustic field can be performed on a microphone array using the Direction of Arrival algorithm, which can estimate angle of arrival of acoustic waves, like tones or speech signals. This paper presents real time analysis of an acoustic field based on the implementation of DOA algorithms on the DSP board.
Paper 5355

12:00 hr J-8
The Acoustic Conditions in Finnish Concert Spaces - Preliminary Results
Henrik Moller, Tapio Lahti & Anssi Ruusuvuori
Akukon Consulting Engineers, Helsinki, Finland

The paper will describe a series of acoustic measurements in Finnish concert halls. The measurements were made using the IRMA system described in another paper offered for presentation at the conference. Both traditional single channel measurements as well as binaural measurements were taken in all halls. In some halls, also multidimensional measurements were made using the special probe also described in the above-mentioned paper. The measurement results are used in a comparison of the acoustic conditions in Finnish concert spaces with other spaces.
Paper 5356

12:30 hr J-9
Sound System Design for the Sydney 2000 Olympic Games
Mac Takeuchi (1), Damian Rowe (2), Ryoichi Omachi (1) & Damian Leonard (3)
(1) Panasonic/RAMSA, Yokohama, Japan
(2) Greater Union Entertainment Technology, NSW, Australia
(3) Integral Event Management, NSW, Australia

Sydney 2000 Olympic Games were held in Australia from September 15 to October 1, 2000 with more than 10,000 athletes in 300 events. We have designed the sound systems for 34 venues where included not only indoor but also outdoor events. Computer Acoustic Simulation software was originally developed to support designing sound system for each venue. It summarizes to maintain high quality sound and good intelligibility in case of long distance transmission even for outdoor venues by using digital technology. Furthermore sound pressure level (SPL) of each venue was measured during the actual Games. This paper describes how sound systems for the Sydney 2000 Olympic Games were designed and performed.
Paper 5357


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