1,720,990 research outputs found
Recording of Italian Opera orchestra and soloists: The musicians point of view
No full textAnechoic recordings of symphony orchestra have been proposed in the literature and have been used in a multitude of studies concerning both innovative measurements and psychoacoustic experiments. Using the same approach, the present work shows the results of a recording campaign focused on the Italian Opera. Different motifs from Italian Operas have been played by professional musicians and soloists in the silent room of the Bologna University. The excerpts have been chosen because of their musical style characteristics and their acoustic properties (dynamics, tymbre, vibrato). The chosen motifs come from scores of Donizetti, Verdi and Puccini, in order to consider various orchestrations and Opera styles.
Experimental evidence of band gaps in periodic structures
Full text linkThe appearance of band gaps in periodic media is a well known phenomenon. In the past 15 years an increasing attention was payed to sonic crystals, as the properties of such arrangements could lead to the design of innovative noise barriers. In fact, sonic crystal barriers exhibit good insulation properties at some frequencies and could be tuned in order to cause stop bands in a frequency range centred at 1 kHz, classic for road traffic noise pollution. In this paper measurements are described that were conducted over an array of cylinders arranged in a square lattice, whose Bragg band gap was centred at about 900 Hz. Measurements were conducted in accordance with EN 1793-6. Together with measurements, FE simulations were carried out in order to address and verify the procedure. In the simulations, cylinders were assumed to be infinitely rigid and the system was investigated in a 2d domain. The first hypothesis is consistent with the high contrast between the acoustic properties of air and PVC. The second one is consistent with the measurement method, as the windowing of the IRs leads to an evaluation of the attenuation due only to the BG without comprising any effect from ground reflections. Simulation and measurements are compared and discussed over a variety of cases
La misura della trasmissione laterale nelle strutture in legno: problematiche e metodologie a confronto
No full textIl presente contributo presenta il confronto fra differenti tecniche di misura utilizzate per la valutazione della trasmissione laterale su giunti per strutture in cross laminated timber (CLT). La campagna di misure, voluta e finanziata da Rotho Blaas srl, è stata condotta in osservanza della normativa EN ISO 10848 [1] al fine di misurare i valori di indice di riduzione delle vibrazioni Kij utilizzabile per stimare in maniera predittiva il potere fonoisolante apparente secondo la normativa EN 12354 [2].
Scelta una configurazione di misura standard per un giunto parete-solaio, sono state effettuate misurazioni dei livelli di velocità e di riverberazione strutturale con diversi metodi. In entrambi i casi, i pannelli sono stati eccitati con una sorgente elettrodinamica fissata alla parete e con il martello strumentato, dotato di tre punte a coprire gli intervalli di frequenze di interesse.
Nel presente articolo sono dapprima illustrate le specifiche della catena di misura e l’analisi del segnale utilizzata per l’estrazione dei risultati. Poi sono riportati e discussi i risultati, in particolare con riferimento all'incidenza che ogni componente ha sul risultato finale.
Le metodologie di calcolo adottate seguono in maniera dettagliata le indicazioni della norma ISO 10848 [1] con lo scopo di confrontare i risultati di diverse metodologie di misura per valutare quale sia la più affidabile
The acoustics of the Bayreuth Festspielhaus
No full textThe role of the Bayreuth Festspielhaus in the development of the modern opera house is well known. In spite of the prestige of the Festspielhaus, the values of its room acoustics criteria have been analyzed and reported in few works. A measurement campaign has been recently made in the theatre, placing directional and omnidirectional sources on the stage and in the orchestra pit. Monaural and binaural impulse responses have been recorded on a dense mesh of receivers. Normal factors have been extracted and subjective scale values have been estimated taking into account the peculiarity of the Wagnerian opera
Acoustic measurements in eleven Italian opera houses: correlations between room criteria and considerations on the local evolution of a typology
Full text linkSeveral studies focused on the acoustical characterisation of concert halls and opera houses analysing more or less homogeneous sets of halls and spotting reference criteria.
This work presents the results of a detailed measurement campaign that was carried out over eleven small and mid-sized historical opera houses in the North of Italy with the aim of characterising this hall typology and to relate it to the reference literature. The cluster is intended to represent an adequate sample of case studies relative to different capacities and different design approaches that followed one another starting from the seventeenth century. The theatres were investigated using monaural and binaural techniques, performing impulse response measurements at each seat in the stalls and in each box. Seven ISO 3382 criteria are chosen to characterise these theatres and averaged over the three main listening areas denoted by the Italian opera house typology, i.e. the stalls, the boxes and the gallery. The correlation coefficients between interrelated criteria are presented and commented in relation to the architectural features of the theatres and to the existing literature
Notes about the early to late transition in Italian theatres
No full textIn some classical room acoustic criteria (e.g. C80, LG, IACC0,x, LF, JLF, JLFC) it is a standard
practice to use a fixed temporal interval to quantify the weight of the early reflections
versus the late reverberation. A value of 80 ms has been proposed in the literature also
for opera houses. This paper, using the same approach of the previous literature, studies the
temporal limit of integration in several Italian historical theatres. Early-to-late energy
ratio and interaural cross correlation are tested and a new integration limit is proposed
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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