Proposal of a simplified methodology for reverberation time prediction in standard medium size rooms with non-uniformly distributed sound absorption

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Table 3

Comparison between experimental and theoretical results, obtained using the proposed empirical correction, for eight case studies (corresponding to eight classrooms).

Case study		500 Hz		1000 Hz		2000 Hz		Average
		Value	Deviation in the estimated T (%)	Value	Deviation in the estimated T (%)	Value	Deviation in the estimated T (%)	Deviation in the estimated T (%)
C1: Classroom	α without correction	0.99		0.99		0.95
	α with correction	0.46		0.46		0.46
	T without correction	0.74	−40%	0.70	−39%	0.69	−35%	−38%
	T with correction	1.34	9%	1.20	6%	1.11	4%	6%
	T experimental	1.23		1.13		1.07
C2: Classroom	α without correction	0.69		0.62		0.37
	α with correction	0.41		0.39		0.29
	T without correction	0.59	−28%	0.63	−24%	0.89	−6%	−19%
	T with correction	0.88	7%	0.90	7%	1.04	10%	8%
	T experimental	0.82		0.84		0.95
C3: Classroom	α without correction	0.74		0.54		0.42
	α with correction	0.42		0.36		0.31
	T without correction	0.72	−3%	0.74	−10%	0.75	−14%	−9%
	T with correction	0.78	5%	0.85	4%	0.87	0%	3%
	T experimental	0.74		0.82		0.87
C4: Auditorium	α₁ without correction	0.94		0.65		0.48
	α₂ without correction	0.74		0.54		0.42
	α₁ with correction	0.46		0.40		0.34
	α₂ with correction	0.42		0.36		0.31
	T without correction	0.56	−32%	0.69	−17%	0.80	−15%	−21%
	T with correction	0.88	7%	0.93	11%	0.97	3%	7%
	T experimental	0.82		0.84		0.95
C5: Classroom	α without correction	0.85		0.70		0.55
	α with correction	0.44		0.41		0.37
	T without correction	0.34	−33%	0.38	−33%	0.44	−21%	−29%
	T with correction	0.53	4%	0.53	−7%	0.55	−2%	−2%
	T experimental	0.51		0.57		0.56
C6: Classroom	α without correction	0.85		0.80		0.70
	α with correction	0.44		0.43		0.41
	T without correction	0.39	−34%	0.40	−37%	0.42	−28%	−33%
	T with correction	0.60	2%	0.59	−6%	0.57	−2%	−2%
	T experimental	0.59		0.63		0.58
C7: Computer room	α without correction	0.30		0.45		0.70
	α with correction	0.25		0.33		0.41
	T without correction	0.96	−36%	0.78	−28%	0.58	−51%	−38%
	T with correctiono	1.04	−30%	0.91	−16%	0.80	−33%	−27%
	T experimental	1.49		1.08		1.19
C8: Music room	α₁ without correction	0.85		0.70		0.55
	α₂ without correction	0.80		0.60		0.45
	α₁ with correction	0.44		0.41		0.37
	α₂ with correction	0.43		0.38		0.33
	T without correction	0.28	−30%	0.34	−35%	0.43	−25%	−30%
	T with correction	0.47	18%	0.52	0%	0.57	0%	5%
	T experimental	0.40		0.52		0.57

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