ABCDEFGHIJKLMNOPQRSTUVWXYZAAABACADAEAFAGAHAIAJAKALAMANAOAPAQARASATAUAVAWAXAY
1
N.TimestampEmail addressSurname and NameMatriculaABCDEFOnline
1) Check the sentences you think are TRUE
-11-11-1-11
2) In room acoustics, a single omnidirectional microphone allows for measuring:
1111-1-11
3) What is the definition of "Modulation Transfer Function"?
Score
4) After recording the decay of a stationary source, the SPL reduces from 80+F to 40+E dB in 2+D/5 seconds. Compute the reverberation time T20
OK Value
OK unit
Score
5) The MLS signal is used for measuring the reverberation time in a room. What is the maximum duration of the impulse response which can be measured with an MLS signal of order 14+F at a sampling rate of 48 kHz?
OK Value
OK unitScore
6) An exponential sine sweep is 4+F s long, followed by a silence of 2+E/2 s. After convolving the test signal with its matched inverse sweep, how long will be the raw signal, before extracting just the linear impulse response?
OK Value
OK unitScore
7) Compute the value of the apparent sound absorption coefficient α of a velvet curtain having an absorption coefficient a of 0.05+F/100 and a sound reduction index R of 3+E/4 dB.
OK Value
OK unitScore
8) Estimate the Sound Reduction Index R of a wall weighting 400+EF kg, having a surface of 7+E m² at the frequency of 300+D*10 Hz.
OK Value
OK unit
ScoreTOTAL
2
111/7/2023 9:39:01mirko.monaco@studenti.unipr.itMonaco Mirko3569423569421
A dodecahedron loudspeaker ensures a reasonably omnidirectional emission, A dodecahedron loudspeaker requires digital equalisation for emitting a flat spectrum, The ESS (exponential sine sweep) signal is immune from not linear distortion
0101001
The SPL, The Reverberation Time, The Clarity Index C50, The Clarity Index C80, The STI (Speech Transmission Index)
1111001
It is the ratio between the amplitude modulation received by the microphone and the amplitude modulation emitted by the source
16 s6.00s11.37 s1.37s116.00s00.4680.468139.9 dB39.90dB114
3
211/7/2023 9:39:55violettegobert79@gmail.comViolette Gobert3658463658461
A dodecahedron loudspeaker ensures a reasonably omnidirectional emission, A dodecahedron loudspeaker requires digital equalisation for emitting a flat spectrum
0101000
The Reverberation Time, The STI (Speech Transmission Index)
0100001
It is the ratio between the amplitude modulation received by the microphone and the amplitude modulation emitted by the source
110.8 s5.14s-121.8 s21.85s124.00s00.4900.508123.2 dB39.75dB-16
4
311/7/2023 9:40:13prince.mathew@studenti.unipr.itMathew Prince3658683658681
Impulsive sources like balloons, pistol shots, firecracker, clapping machine ensure a perfectly omnidirectional emission, A dodecahedron loudspeaker ensures a reasonably omnidirectional emission
-1100000The SPL1000000
It is the ratio between the amplitude modulation received by the microphone and the amplitude modulation emitted by the source
12.85 s5.14s-187.38 s87.38s116 s29.00s-10.5340.485160.1438.72dB-12
5
411/7/2023 9:40:40mahdihabibi7798@gmail.comhabibi mahdi3 6 6 0 4 33660431
A dodecahedron loudspeaker ensures a reasonably omnidirectional emission, A dodecahedron loudspeaker requires digital equalisation for emitting a flat spectrum
0101000
The SPL, The Reverberation Time
1100000
It is the ratio between the amplitude modulation received by the microphone and the amplitude modulation emitted by the source
13.08s02.73s018.00s00.478037.64 dB37.64dB17
6
511/7/2023 9:41:08vinaysankar@outlook.comsankar vinay3658653658651
A dodecahedron loudspeaker ensures a reasonably omnidirectional emission, A dodecahedron loudspeaker requires digital equalisation for emitting a flat spectrum, The ESS (exponential sine sweep) signal is immune from not linear distortion
0101001
The SPL, The Reverberation Time, The Clarity Index C50, The Clarity Index C80
1111000
It is the ratio between the amplitude modulation received by the microphone and the amplitude modulation emitted by the source
11.8 s5.54s-110.9 s10.92s123 s23.00s10.0700.455-152.6 dB38.67dB-18
7
611/7/2023 9:41:53Basantdulhani6@gmail.comBasant Kumar 3675043675041
A dodecahedron loudspeaker ensures a reasonably omnidirectional emission, A dodecahedron loudspeaker provides natively a very flat spectrum, The TDS (chirp) signal is immune from not linear distortion
01-100-10
The SPL, The Reverberation Time, The Clarity Index C50, The Clarity Index C80
1111000
It is the reduction of the depth of amplitude modulation of a signal caused by noise and reverb
-1T20= 2 Seconds4.09s-1
Tmax = (2^(15+F-1))/48000 Seconds
5.46s-15+F+E/2 Seconds18.00s-1Alpha = 0.0650.591-1R= 25.55 dB42.11dB-1-2
8
711/7/2023 9:41:55ahmed.saleh201511@gmail.comSALEH,AHMED 3678003678001
Impulsive sources like balloons, pistol shots, firecracker, clapping machine ensure a perfectly omnidirectional emission, A dodecahedron loudspeaker provides natively a very flat spectrum
-10-10000
The SPL, The STI (Speech Transmission Index)
1000001
It is the ratio between the amplitude modulation received by the microphone and the amplitude modulation emitted by the source
15.40s00.34s010.00s00.551076.5db42.73dB-11
9
811/7/2023 9:42:23francesco.mortali@studenti.unipr.itMortali Francesco3438333438331
A dodecahedron loudspeaker ensures a reasonably omnidirectional emission, A dodecahedron loudspeaker requires digital equalisation for emitting a flat spectrum, The ESS (exponential sine sweep) signal is immune from not linear distortion
0101001
The SPL, The Reverberation Time, The Clarity Index C50, The STI (Speech Transmission Index)
1110001
It is the ratio between the amplitude modulation received by the microphone and the amplitude modulation emitted by the source
15.40s02.73 s2.73s117.50s00.5000.502140.32 dB40.33dB112
10
911/7/2023 9:43:53legrouxthibaut@gmail.comThibaut Legroux36361036361010000000The SPL1000000
It is the ratio between the amplitude modulation received by the microphone and the amplitude modulation emitted by the source
19.6 s4.92s-10.34 s0.34s110.50s00.5200.523141.11 dB41.32dB15
11
1011/7/2023 9:44:50andrea.ronga@studenti.unipr.itRonga Andrea3072053072051
A dodecahedron loudspeaker ensures a reasonably omnidirectional emission, A dodecahedron loudspeaker requires digital equalisation for emitting a flat spectrum, The ESS (exponential sine sweep) signal is immune from not linear distortion
0101001
The SPL, The Reverberation Time
1100000
It is the reduction of the depth of amplitude modulation of a signal caused by noise and reverb
-13,2 s3.20s110,92 s10.92s111 s20.00s-10.601041,24 dB41.35dB17
12
11paperMohamed Alsawish3677983677980
A dodecahedron loudspeaker ensures a reasonably omnidirectional emission, The TDS (chirp) signal is immune from not linear distortion, The ESS (exponential sine sweep) signal is immune from not linear distortion
01000-11The SPL, The IACC1000-100
It is the ratio between the amplitude modulation received by the microphone and the amplitude modulation emitted by the source
15.23s087.38s030.50s00.429037.23dB02
13
12paper
Wondmu Yewdufre Aklog
2610952610950
A dodecahedron loudspeaker ensures a reasonably omnidirectional emission, A dodecahedron loudspeaker requires digital equalisation for emitting a flat spectrum, The ESS (exponential sine sweep) signal is immune from not linear distortion
0101001
The SPL, The Reverberation Time, The Clarity Index C50, The Clarity Index C80
1111000
It is the ratio between the amplitude modulation received by the microphone and the amplitude modulation emitted by the source
120log(4)sec3.33s-160dB10.92s-145dBmvim24.50s-10.0200.399-148.47 dB35.35dB-13
14
15
Note: formatting errors causing the loss of 1 point
16
Wrong Formatting (spaces or slashes)
17
Wrong Formatting (simbols before number or after unit)
18
Wrong unit
19
20
Note: Formatting errors not penalised (for this time)
21
Comma instead of decimal dot, unit in extended format
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100