Measurement Study in Other Rooms Comparison

Measurement Study in Other Rooms. Comparison between objective & perceptive measurements for room acoustic predictions. Abstract. H. Dujourdy(1)(2) and ...
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Rebuilding of an Orchestra Rehearsal Room

impedance

Comparison between objective & perceptive measurements for room acoustic predictions Abstract

Summary

Great importance of good acoustical conditions in rehearsal room

Results show good correlation between perceptual and objective measurements

No guidance of operations for design

The relation between requested acoustic characteristics and design issues leads to the modeled design witch results are good compared to expected ones.

This is the study of relocation of La Sirene de Paris

C80(dB)

D50(%)

Time (s)

ST1(dB)

1.0 0.8 0.6 0.4

Tc(ms)

0.2 0.0

63

125

250

500 1000 Fréquence (Hz)

2000

4000

8000

1.6

20

1.4

15

Figure 1: Ground plan of La Sirène

0.6

-5

250

500 1000 Fréquence (Hz)

2000

4000

-15

63

125

250

2

1

2 4

3

3

3

4

5

0

5

-1 -2 -3

Figure 5: Perceptive results

4000

8000

500 1000 Frequence (Hz)

2000

4000

8000

New Room Acoustic Furnitures 1

1

2000

100 90 80 70 60 50 40 30 20 10 00

Figure 4: Measurement results

63

125

250

500 1000 Fréquence (Hz)

2000

4000

8000

Bondy CMA17 Levallois RATP La Sirène

63

125

250

500 1000 Frequence (Hz)

2000

4000

8000

Modelling of the Room with CATT-Acoustic

3

Indice

8000

500 1000 Frequence (Hz)

0

-10 125

250

5

0.2 63

125

10

0.4

FF

PP

HIGH PITCH

MEDIUM PITCH

LOW PITCH

SPATIAL

CLARITY

INTENSITY

0.8

63

20 18 16 14 12 10 8 6 4 2 0

Toward Acoustic Solution

Perceptual study in La Sirène REVERBERATION

1.0

0.0

Volume: 1200 m3 Gauge: 100 persons

Figure 2: Equipment in La Sirène

ST1 (dB)

Time (s)

1.2

Figure 3: Acoustical indices in La Sirène (empty)

100 90 80 70 60 50 40 30 20 10 00

Central time (ms)

TR30(s)

1.2 Definition (%)

EDT(s)

1.4

Clarity (dB)

Guidance of acoustical design for orchestra rehearsal room has been developed from literature and our own experience

Measurement Study in Other Rooms Freq.(Hz)

H. Dujourdy(1)(2) and T. Toulemonde(2)

Figure 6: Lateral view

Figure 7: Front view

Ceiling : reflecting square panels of 2 meters wide Ceiling : absorbing whool fiber Broadband absorption perforate wood Diffusing items and low frequency absorbers Bleachers for musicians

(1) LAM d’Alembert, UPMC, Paris, France (2) IMPEDANCE SAS, Paris, France