4.5 Discussion 53-54
5 CONCLUSION
5.1 Conclusions
55
5.2 Recommendation for future work 56
5.3 Benefit of the Project
56
REFERENCES 57-58
LIST OF FIGURE
NO TITLE
PAGE
1.1 The overall process of project
4 1.2
PSM 1 Gantt Chart 5
1.3 PSM 2 Gantt Chart
5 2.1
The reverberation time Tontechnik-Rechner 16
2.2 The graph of critical distance
17 2.3
An illustration of sound reflection in enclosed room 19
2.4 The illustration of reflection, absorption and transmission
20 3.1
The research flow chart for overall process 22
3.2 Sample of plan layout
23 3.3
Sample of parameters points. 24
3.4
a Loudspeaker between Floor and Wall, b Loudspeaker between
Floor and Ceiling, and c Loudspeaker at flat surface ceiling-wall junction
25 3.5
The sample of unfinished contour plot 27
3.6 Step to changing the contour level
28 3.7
Step to set intervals 28
3.8 Step to generate mesh
29
3.9 Shaded band in planar form
29 3.10
The experiment process flow 30
3.11 The dimension of modified anechoic chamber
31 3.12
The process flow implementation new sound absorber 32
4.1 a SPL simulation at First Floor for Q=1 b SPL simulation at First Floor for Q=2 c SPL simulation at First Floor for Q=4
39-40
4.2 a Alcons simulation at First Floor for Q=1 b Alcons simulation at
First Floor for Q=2 c Alcons simulation at First Floor for Q=4 41-42 4.3
a SPL simulation at Second Floor for Q=1 b SPL simulation at Second Floor for Q=2 c SPL simulation at Second Floor for Q=4 46-47
4.4 a Alcons simulation at Second Floor for Q=1 b Alcons
simulation at Second Floor for Q=2 c Alcons simulation at Second Floor for Q=4
48-49
4.5 The relationship between SPL and Alcons at Q=1
50
4.6 The relationship between SPL and Alcons at Q=2
50
4.7 The relationship between SPL and Alcons at Q=4 51
4.8 The SPL and RT60 by using dried rice straw and
kekabu
52
LIST OF TABLES
NO TITLE
PAGE 2.1
Monopole sound source Q and d at various locations Rossing
et al.
, 2002 8
2.2 Methods used in Speech Intelligibility Predictor Paulraj
et al.
, 2010. 11
2.3 Classification of quality of Speech Intelligibility Score Ballou, 2008
13
4.1 Volume and surface area calculation
34
4.2 Parameter for RT60 34
4.3 Summarized calculation for RT60 and Dc 35
4.4 Distance between loudspeaker and microphone at First Floor of
Masjid
36 4.6 Alcons values according critical distance at First Floor of
Masjid
38
4.7 The distance between loudspeaker and listener at Second Floor