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A study of coupled volumes in opera houses during restorations
No full textIn an opera house the main hall and the stagehouse can be regarded as a typical example of acoustically coupled volumes. In this case the coupling is regulated by the proscenium opening. As a consequence the modifications in the stagehouse can have an significant impact on the hall. In particular an excess of reverberation is to be expected if the stage set is particularly acoustically light or, even worse, if the volume of the tower is increased for some reason. In this respect several technical and logistic requirements imply an increase of the stagehouse volume when theatres are refurbished. This seldom happens especially in the case of historical opera houses to optimize the change and storage of modern settings. In order to study the coupled the gathering of suitable experimental data for arranging a reliable calculation model requires special efforts. In the present work dedicated acoustical measurements are presented to qualify the impact on the hall of the modifications to be implemented in the stagehouse of an historical opera house, the Teatro "Zandonai" in Rovereto, Italy
ATLAS: UN PROGETTO DI RICERCA DI INTERESSE NAZIONALE INTERAMENTE DEDICATO ALLA FRUIZIONE, TUTELA E VALORIZZAZIONE ACUSTICA E VISIVA DEI TEATRI ANTICHI
No full textTecniche e strumenti per la misura del rumore e delle vibrazioni prodotte dagli impianti tecnologici degli edifici
No full textEvaluation of noise from air conditioning systems - A draft proposal
No full textThis paper discusses the practical evaluation of noise levels generated by air-conditioning and ventilating systems inside buildings. The results of this work are incorporated in a Draft Italian Standard. The criterion for evaluation is based on the difference between the total sound pressure level in the room when the noise source is working, and the background noise level. The allowable difference must decrease with the value of the background noise level. The measured sound pressure level is corrected according to the type of noise and to the acoustical characteristics of the room; impulsive noises should not be present in the system. At present this Draft Proposal, which has been developed by a Working Group of the Italian Standard Institution (UNI), is under discussion. © 1980, All rights reserved
Prove interlaboratorio per la determinazione dei valori di ripetibilità e riproducibilità nella misura del potere fonoisolante di pareti
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Acoustic parameters affecting the perceived balance between sound sources located on the stage and in the orchestra pit in opera theatres
No full textAcoustic experience by a listener in an opera theatre is characterized by the term balance, referring to the acoustic competition between the singer on the stage and the orchestra in the pit. This presentation summarizes the authors' previous investigations regarding the subjective evaluations of balance. Since each investigation used different acoustic parameters and those frequency ranges, further analyses are conducted so that all the investigations use the same acoustic parameters and frequency range. The scale values obtained in the auditory tests are correlated with the acoustic parameters for the stage and the pit sources as well as the stage to pit ratio. The following parameters are discussed in terms of the preferred conditions and those interactions: sound level, sound level difference (Balance B) between the stage and the pit sources, reverberation time, early-to-late energy ratio, and interaural crosscorrelation IACC
The acoustics and restoration of ''Salone Pedrotti'' in Pesaro
No full textThis paper deals with the experimental results gathered in order to define the acoustic
characteristics of the “Salone Pedrotti” in Pesaro, before its restoration.
The hall is rectangular, with about 800 divided seats between the stalls and the two galleries.
It is one of the few examples of shoe-box halls in Italy.
To evaluate the acoustic characteristics of the hall, the main acoustic parameters in use today
were measured at various points.
The results of the measurements revealed values of the acoustic parameters which were very
close to those considered optimal for halls of this size and use. From the results of the
measurements, the great importance of the ceiling and the link between the top of the stage and
the loft, comes out. The wall separating these two parts is formed by a light structure made of
plaster and straw, unlike the heavy walls usually imposed by fire protection regulations. The
ceiling is therefore not only a passive element of acoustic reflection, but also an active element,
capable of radiating acoustic energy coming from the top of the stage.
In view of the required restoration of the ceiling, further studies are being carried out in
order to better understand the acoustic function of this element of the hall and to be able to give
valuable advice regarding the necessary interventions to safeguard this acoustic function and at
the same time strengthen the structure
Laboratory and field measurements of airborne sound insulation using the sound intensity technique
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