past, present and future of sti herman j. m. steeneken (steeneken)
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Past, Present and Future of STI Herman J. M. Steeneken (www.steeneken.com). - PowerPoint PPT PresentationTRANSCRIPT
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1Acousteen, Herman Steeneken
Past, Present and Future of STI
Herman J. M. Steeneken (www.steeneken.com)
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2Acousteen, Herman Steeneken
Past: STI (1971, 1980), Envelope Spectrum (1972), MTF (1975), RASTI (1979), prediction by ray-tracing(1981), IEC 60268-16 (1988, 1998)
Present: Revised STI (1992, 1999, 2002), STIPA (2001), IEC 60268-16 (2003), ISO 9921 (2003)
New and Future: Binaural STI, improvement measurement STI from speech signal, non-native speech, vocoders
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3Acousteen, Herman Steeneken
Signal-to-Noise ratio !!!
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4Acousteen, Herman Steeneken
Assessment Methods
• Subjective assessment with subjects (speakers
and listeners): representative, limited
reproduction, no diagnostics, laborious
• Objective assessment based on physical
properties (measurements): reproducible,
diagnostic, fast
• Objective methods allow prediction of system
performance: design tool
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5Acousteen, Herman Steeneken
Speech and Noise
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6Acousteen, Herman Steeneken
Speech envelope function and envelope spectrum
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7Acousteen, Herman Steeneken
Spatial line frequency equivalent to MTF
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8Acousteen, Herman Steeneken
Distortion of Speech Envelope
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9Acousteen, Herman Steeneken
Dynamic measurement of SNR
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10Acousteen, Herman Steeneken
Matrix for seven MTF’s
1 Hz
X
3 Hz
10 Hz
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11Acousteen, Herman Steeneken
CALCULATION of STI
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12Acousteen, Herman Steeneken
Calculation scheme
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13Acousteen, Herman Steeneken
Frequency weightings (various studies)
octave-band centre frequency (Hz)
freq
uenc
y-w
eigh
ting
fact
or
0.0
0.1
0.2
0.3
0.4
0.5
125 250 500 1k 2k 4k 8k
nonsense syllables (Pavlovic et al. 1984, ANSI S3.5)PB-words (Steeneken et al. 1980, IEC 60268-16)initial consonants (Steeneken, 1992)vowels, (Steeneken, 1992)
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14Acousteen, Herman Steeneken
Redundancy with image detection
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15Acousteen, Herman Steeneken
Frequency weightings (CVC words)
octave-band centre frequency (Hz)
fre
qu
en
cy-w
eig
htin
g fa
cto
r
0.0
0.1
0.2
0.3
0.4
0.5
125 250 500 1k 2k 4k 8k
CVC words male speech female speech
MTI + .... + )MTIMTI(
- MTI + )MTIMTI( - MTI = STI
77322
2221111r
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16Acousteen, Herman Steeneken
Relation Noise and Band-pass limiting
STI r
CV
C-w
ord
scor
e (%
)
1
2
3
4
5
6
78
9
10
11
12
13
14
15
16
17
18
0
20
40
60
80
100
0.0 0.2 0.4 0.6 0.8 1.0
male speech
S.d.= 4.4%
Male speech
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17Acousteen, Herman Steeneken
Listening test with four subjects
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18Acousteen, Herman Steeneken
Embedded CVC words:
versta des overen nu fijs uithet woord zek eindenoteer lal punt
“Semi random” combinationof:
17 initial consonants15 vowels11 final consonants
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19Acousteen, Herman Steeneken
Relation AGC and echoes
S.d.= 6.9 %
Male speech
STI r
CV
C-w
ord
scor
e (%
)
33
34
35
36
37
38
39
4041
42
43
44
44
45
46
47
48
49
50
51
52
53
54
55
0
20
40
60
80
100
0.0 0.2 0.4 0.6 0.8 1.0
male speech
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20Acousteen, Herman Steeneken
Qualification of STI (Acustica, 1984)
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21Acousteen, Herman Steeneken
Performance cabin public address
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22Acousteen, Herman Steeneken
Iso-STI contours
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23Acousteen, Herman Steeneken
Effective gain of a PA-system
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24Acousteen, Herman Steeneken
Field measurement
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25Acousteen, Herman Steeneken
Full STI (STI-14 and limited modulation frequency range STI-3)
STI-14
• Seven octave bands
• 14 Modulation frequencies
• Random envelope for octaves not under test
STI-3
• Seven octaves
• 3 Modulation frequencies (1.0, 3.15, and 10 Hz)
• Random envelope for octaves not under test
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26Acousteen, Herman Steeneken
RASTI (Room Acoustics STI,1979)
Only for person-to-personcommunication assessment
Two octave bands(500Hz and 2 kHz)
Complex envelope(4 and 5 mod. freq.)
see Acustica 1984, IEC 60268-16
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27Acousteen, Herman Steeneken
STI-PA (STI Public Address, 2001)
Assessment of Public Address
including: acoustic environment,band-pass limiting, overload dis-tortion
Seven octave bands (125 Hz and 250 Hz merged)
Complex envelope (2 simultaneous modulation frequencies per band)
see IEC 60268-16
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28Acousteen, Herman Steeneken
Future
• Binaural STI
• Improvement using Speech as test signal
• Non-native talkers and listeners
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29Acousteen, Herman Steeneken
Future: Binaural STI (I)
Use artificial head and perform
simultaneous measurement on both ears
Select highest performance (best ear
selection)
Use cross correlation approach for 500,
1000, and 2000 Hz.
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30Acousteen, Herman Steeneken
Future: Binaural STI (II)
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 10
10
20
30
40
50
60
70
80
90
100
22
27
33
39
37
3 7
2523
19
417
28
35
15
13
9
1
31
38
5
18
32
20
26
6
1116
2
29
24 14
10
8
21
12
3634
30
STI
CV
C w
ord
scor
e (%
)
monaural CVC vs STIMean ear STIBinaural STI
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31Acousteen, Herman Steeneken
Future: improvement Speech Signal as test signal
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32Acousteen, Herman Steeneken
Future: non-native talkers and listeners
L1 L2
-12 -6 0 6 12 0
10
20
30
40
50
60
70
80
90
100
Speech-to-noise ratio (dB)
spee
ch in
telli
gibi
lity
(% c
orre
ct)
resp
onse
s)
0.10 0.300
0.50 0.70 0.90 STI
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33Acousteen, Herman Steeneken
Conclusions
• STI predicts the speech intelligibility for many
types of distortion: noise, band-pass limiting,
non-linearity's, temporal, vocoding, non-native
speech, and binaural hearing.
• Improvements (measuring methods or scope) of
STI will not change the qualification ranges.
• STI is an international standardized method
(ISO9921, IEC 60268-16) and used for many
national standards.