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the sounds, less than 10 points on the 100 points scale. As well, to be musician has no significant effect on the global judgement on the sounds; however this sub-group has a lower rating than other participants to the tests, less than 10 points on the 100 points of the full scale. 2.2 Correlations between physical parameters and perceptive judgements on music The correlations presented in the matrix are the relationship between the physical measures and the mean of the perceptive responses, considered here as measured on a numerical scale; only the coefficients over 0.6 are displayed, explaining roughly a third of the variance. Dist Reverb Strength Clarity STI F P C R A Dist 1 Reverb 0,206 1 Strength -0,960 -0,042 1 Clarity -0,106 -0,717 -0,104 1 STI -0,194 -0,780 -0,041 0,965 1 F intensity -0,942 -0,123 0,977 -0,040 0,017 1 P distance 0,957 0,175 -0,956 -0,097 -0,150 -0,981 1 C clarity -0,632 0,131 0,573 0,139 0,139 0,490 -0,572 1 R reverberation 0,901 -0,009 -0,961 0,221 0,156 -0,965 0,916 -0,480 1 A Global impress -0,041 0,335 -0,027 0,057 0,018 -0,128 0,013 0,680 0,135 1 T moder perform 0,403 -0,325 -0,355 -0,088 -0,050 -0,268 0,376 -0,873 0,238 -0,885 Table 2: correlations between physical parameters and perceptive responses - The correlation between the true distance and the perceived one is very high (r = 0.96),with the strength of the sound (r = 0.94), as well as with the perceived reverberation (r = 0.90). - More the distance is short, more the Clarity is good. - There is no relationship between various judgements and the acoustic reverberation. - Clarity and STI physical indexes are very closely related, but without a relationship with any judgements. - There are no high relationships between the overall impression of the sounds and a physical parameter, only a trend with the Distance, the Reverberation and the Strength. 2.3 General comments on the influence of the age on the rating of speech sounds The same analysis has been performed for the source “SPEECH”. - On the whole , 32 sounds are rated differently, on a total of 864 ratings, that is less than 5%. - But these sounds are under or over estimated, mainly by the age subclasses “ less 25” and “more than 55 or 65 years”, so it can be concluded to a light influence of the age on the perception of the speech. Some differences have been observed, between men and women, but none of them are statistically significant: the rating of the speech qualities is not different in men and women. The analysis of the preferred sounds according the acoustic parameters has been carried out, as shown in figure 3, separately for each sound: Six sounds ((5-7-23-15-11-19) are clearly rejected: they are rated as louder, very close, and to have a low RT. These sounds are corresponding to the source position 2, and receiver position 1. Five sounds (13, 21, 1, 9, 22) are positively rated: They have a high intensity score, low in perceived distance, and have high scores in reverberation and clarity. A synthetic summary from this type of analysis is given table 3.
Distance 90,0 80,0 70,0 60,0 50,0 40,0 30,0 20,0 10,0 0,0 3 23 7 15 11 19 13 1 9 21 17 5 Tot 16 14 8 18 4 22 20 6 10 12 24 2 Distance 21,1 22,0 22,9 23,9 27,1 27,7 29,6 33,8 34,5 34,9 38,1 39,8 50,1 60,5 63,1 64,9 66,2 69,1 70,9 71,1 72,5 74,6 75,0 78,1 80,5 Figure 3: The distance source-receiver is very discriminating in speech acoustic Ident Config Source Receiver Dist. Reverb Strength Clarity STI Colon Wall Canop 1 CNSWNC 1 1 24,5 1.27 -4.9 12.4 0.90 1 0 0 9 CSWNC 1 1 24,5 1.73 -4.3 8.3 0.80 1 1 0 13 NCNSWNC 1 1 24,5 0.86 -4.9 13.8 0.91 0 0 0 21 NCSWNC 1 1 24,5 1.42 -4.4 9.4 0.82 0 1 0 22 NCSWNC 1 2 51,9 1.38 -10.7 9.5 0.80 0 1 0 Table 3: preferred speech sounds and their physical characteristics The four sounds, first on the list, are characterised by a source position 1 and a receiver position 1: distance 24.5, RT between 0.86 and 1 .73 , Clarity between 8.3 & 13.8, High STI 0.82 & 0.91. These five sounds have been recorded without canopy. 2.4 Analysis of the correlations between the physical parameters of speech and the perceptive ratings: The correlation between the true distance and the perceived one is very high (r = 0.96),with the strength of the sound (r = 0.94), as well as with the perceived reverberation ( r = 0.80) Shorter is the distance, better is the Clarity. There is no relationship between various judgements and the acoustic reverberation Clarity and STI are very closely related, but without relationship with any judgements An other type of screening has been performed, that allows to provide the variations of the global impression, according the presence (or not) of the elements of architecture: NCNSWNC No Colonnade No Stage Wall No Canopy 48,7S 49,7 M NCSWC No Colonnade Stage Wall Canopy 39,2 53,2 NCSWNC No Colonnade Stage Wall No Canopy 46,5 54,2 CNSWNC Colonnade No Stage Wall No Canopy 47,9 52,4 CSWC Colonnade Stage Wall Canopy 37,1 52,7 CSWNC Colonnade Stage Wall No Canopy 48,5 52,8 GLOBAL 44,6 52,5 Table 4: Mean Values of the judgements Global impression for speech and music
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RTD project in the EC 5th Framework
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THE ERATO PROJECT AND ITS CONTRIBUT
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3 ROOM ACOUSTICAL PARAMETERS The fo
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4.2 Reverberation Time T 30 vs. Fre
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5.1 Aosta & Aphrodisias Odeon The A
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5.3 Strength G vs. Distance 16,00 1
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VITRUVIUS AND ANCIENT THEATRES: ANA
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a line is drawn to touch the outsid
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Actually the colonnade (portico) im
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VIRTUAL REALITY AND ARCHITECTURAL C
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As a result, maybe the most critica
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The absorption and scattering prope
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Figure 3. Sound sources and receive
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In Figure 5 the reverberation time
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ACOUSTICAL MEASUREMENTS IN ANCIENT
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channels four different signals, on
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The clarity for music C80, whose pl
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References [1] EU Project ERATO - I
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