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Sustainability of acoustic materials and acoustic characterization of sustainab...

In the current western society, sustainable development becomes an increasingly significant goal in the evaluation and promotion of constructions. This paper briefly recalls the main methods for construction sustainability evaluation and the environmental impacts associated with various types of building techniques. It presents an evaluation of the sustainability of certain traditional insulating materials (gla...

Noise reduction by urban traffic management

This papers reviews the main studies on traffic management and analyzes the numeric noise results of several current options. It was found that between speed cushions or humps the noise reduction is about 1 to 2 dB(A) but there is an increase of 2 to 3 dB(A) (depending on vehicle and hump types) and annoyance (harsh deceleration and acceleration) near the humps. Speed reduction induced by diminution of road wid...

Noise from amplified music played in discotheques, pubs and clubs - A review of...

The development of new musical styles (with strong low frequency content) and high-power sound-reinforcement systems induced an appreciable increase in the noise levels inside and in the neighbourhood of public establishments diffusing music, for example discos, pubs, clubs or restaurants. The presence of dwellings contiguous or very near this type of establishments frequently involves significant noise nuisanc...

Sound absorption of 18th-century baroque woodcarving in churches

The use of woodcarving in very large surfaces within Catholic churches was very usual in the 17th and 18th century not only in Portugal and Spain but also in Southern America, and in other European Catholic countries. In Portugal, the town of Porto was even well known for its informal school of woodcarving masters. This paper presents the results for sound absorption coefficients regarding a typical early 18th ...

Acoustic behavior of ceramic pots used in middle age worship spaces - a laborat...

This paper presents the theoretical analysis and the results of laboratory measurements of ceramic acoustic pots similar to those used in the vaults and walls of some Middle Age churches in Switzerland and other countries. The resonance frequency of the pots was found to be from 237 Hz to 444 Hz with a high quality factor (average 5.5). A good estimation of the resonance frequency is given by the formula of Als...

Liturgical conditions of Catholic and Reformed celebrations and their relations...

Liturgical differences between Catholic and Reformed celebrations in Switzerland were studied by a temporal analysis of 16 worships. The importance of speech, music, and silence and the participation of the priest, assembly and organist are analysed. Data from 190 churches show that Reformed churches present a smaller average volume, a denser occupation of space and a shorter reverberation time than Catholic ch...

Church acoustics and the influence of occupancy

The effect of occupancy in the speech intelligibility in churches

Measurements were done in four churches with and without occupancy (mean volume of 6314 m3 and mean occupancy of 155 persons) to test the effect of occupancy in the STI values. The results show that occupancy induces a mean increase for the speech intelligibility of DSTI (STIoccup - STIunoccup) of 0.05 with the use of a public address system (PA) and 0.027 without a PA. This increase is caused mainly by the red...

Chaires et abat-voix: Mythe ou réalité acoustique?

Acoustic effectiveness of pulpit reflector in churches

Since the 12th century, pulpits and pulpit reflectors (canopies) were widely used in churches. This paper studies the acoustic effectiveness of such devices based on in site measurements (STI and D50) in four (unoccupied) churches with pulpits with and without the canopy. The pulpit reflector can remove the late reflection resulting from a high ceiling and makes possible to improve the listening conditions at m...