Two slightly mistuned organ pipes of the same nominal tone placed on neighboring holes of the same groove of the slider chest can synchronize if simultaneously sounded. The frequency difference between the two pipes disappears (mitnahme-effekt) giving up on a common frequency which is, in general, slightly higher than both natural frequencies of the pipes [Angster et al., ‘‘Coupling between simultaneously sounded organ pipes,’’ AES preprint 3534 (F1-2), Berlin (1993)]. A related phenomenon is observed when the separation between the two natural frequencies is bigger than 1%: this gives up on an increased difference frequency. This paper shows that a numerical simulation, where the two coupled pipes are modeled with a pair of coupled nonlinear oscillators, qualitatively obtains both these results. Furthermore the existence of a parameter range fitting all the experimental data is presented.
A research project has been carried out by the University of Cambridge (UK), Arup Acoustics (Cambridge, UK) and the Fondazione Scuola di San Giorgio-CNR (Venice, Italy) with the purpose of investigating the relationship between music and the architectural spaces within which it was performed in the context of Venetian vocal polyphony during the 16th century. The most representative churches (San Marco, Parish churches, hospitals and monasteries) were selected for this study and the music was performed within them by the Choir of St John's College of Cambridge University. Members of the audience completed questionnaires assessing the acoustic qualities of the spaces. The results of the audience and expert scores were then statistically analyzed and correlated with a set of room acoustic indices which had been measured in the same locations. In the present paper technical aspects of the experiments and the data analysis will be illustrated. The principal conclusions were as follows: 1. There is a strong correlation between the subjective impression of reverberance with EDT and T30 and musical clarity with C80; 2. A grouping of the churches by typology was found by analysing the reverberation times; 3. The poor quality of clarity was assessed for churches with longest EDT for the performance of music involving polyphony.
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