Remy Wenmaekers (TUE, Level Acoustics)
Constant Hak (TUE)
datum en tijden:
Donderdag 12 november 2015
19:30 Inloop in het Grand Café
Filmhuis en Grand Café 'de Zwarte Doos'
Den Dolech 2
5612 AZ Eindhoven
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Part 1: How a full scale orchestra of dummies attenuates direct and reflected sound
Names: Remy Wenmaekers
Affiliation: Eindhoven University of Technology and Level Acoustics, De Rondom 10, 5612 AP, Eindhoven, The Netherlands.
Stage acoustic parameters like Early and Late Support are often measured on unoccupied stages. This means that a lot of sound absorbing and scattering objects are not present during the measurement. Previous scale model research by Dammerud and Barron has shown that direct sound attenuation by the orchestra can be considerable above 500 Hz. Some additional early reflections occur because of the scattering of sound via the orchestra members. However, it is unknown to what extend the early reflected sound, that is coming from the stage boundaries, is attenuated by the orchestra.
To investigate this problem, a large set of impulse responses have been collected on real stages being occupied by a full scale orchestra of 80 dummies. Comparison is made between an empty stage, a stage occupied by chairs and stands only, and the stage with chairs and stands including the dummies. Results will be presented for a large concert hall, a theatre, an orchestra pit of an opera house, and a small venue.
Part2: Measuring impulse responses in a fully occupied concert hall using a tailor-made electronic musical composition -- Proof of Concept --
Names: Constant Hak
Affiliation: Eindhoven University of Technology, Department of the Built Environment, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
A common question in room acoustics is: “What is the influence of the audience and the orchestra in a concert hall on the room acoustic parameter values?” To check the predicted reverberation time, shooting a blank pistol or popping a balloon in the first week(s) after the commissioning of a concert hall is usually allowed, but performing an extensive standardized room acoustic measurement ‘during a concert’ is often not permitted for practical reasons such as annoyance, fear of hearing loss, loss of concentration of the musicians and loss of time.
To overcome these problems, a special piece of electronic music was composed by way of measurement stimulus, and performed for an audience of almost 1000 people in the concert hall “Muziekgebouw Eindhoven” during the international design exhibiton “Dutch Design Week”. A set of eighty dummies representing the orchestra were on stage. To be sure of a sufficient amount of usable impulse responses obtained from this experiment, eight omnidirectional sound sources on stage and eight omnidirectional microphones in the hall were used (in an asynchronous measurement setting).
The final result is a set of more than fifty high quality room impulse responses obtained in accordance with the ISO 3382-1 standard. It will be explained how the experiment was conducted and how the high quality measurements were obtained.
The presentation of this programme will be in Dutch!
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Rick de Vos (zie bestuur)