critical: Constants Tables for ANSI S3.5-1997 Speech Intelligibility...
In SII: Calculate ANSI S3.5-1997 Speech Intelligibility Index

Description Usage Format Details Source References Examples

Tables of constants for ANSI S3.5-1997 Speech Intelligibility Index (SII)

data(critical)
data(equal)
data(onethird)
data(octave)
data(overall.spl)

Each data frames has 6-21 observations and a subset of the following variables:

fi: Center frequency of SII band, Hz
li: Lower limit of frequency band, Hz
hi: Upper limit of frequency band, Hz
Deltai: Band width adjustment, dB
Ii: Band importance function
normal, raised, loud and shout: Standard spectrum levels for vocal effort levels "normal", "raised", "loud", and "shout", respectively, dB
Xi: Spectrum level of internal noise, dB
Fi: Band importance function (weight)

These data objects provide constant tables 1 – 4 from the ANSI S3.5-1997.

critical: Table 1: Critical band SII procedure constants
equal: Table 2:Equally contributing (17 band) critical band SII
onethird: Table 3: One-third octave band SII procedure constants
octave: Table 4: Octave band SII procedure constants
overall.spl: Overall sound pressure level (SPL) for the for vocal effort levels "normal", "raised", "loud", and "shout", in dB

ANSI S3.5-1997, "American National Standard Methods for Calculation of the Speech Intelligibility Index" American National Standards Institute, New York.

data(critical)
critical # show entire table

data(equal)
names(equal)
equal$fi # extract just the frequency band centers

data(onethird)
barplot(onethird$Ii) # plot band importance function (weights)

data(octave)
round(octave, digits=2) # just 2 digits

data(overall.spl)
overall.spl

     fi   li   hi     Ii normal raised  loud shout    Xi   Fi
1   150  100  200 0.0103  31.44  34.06 34.21 28.69   1.5  0.6
2   250  200  300 0.0261  34.75  38.98 41.55 42.50  -3.9  1.0
3   350  300  400 0.0419  34.14  38.62 43.68 47.14  -7.2  1.4
4   450  400  510 0.0577  34.58  39.84 44.08 48.46  -8.9  1.4
5   570  510  630 0.0577  33.17  39.44 45.34 50.17 -10.3  1.9
6   700  630  770 0.0577  30.64  37.99 45.22 51.68 -11.4  2.8
7   840  770  920 0.0577  27.59  35.85 43.60 51.43 -12.0  3.0
8  1000  920 1080 0.0577  25.01  33.86 42.16 51.31 -12.5  2.6
9  1170 1080 1270 0.0577  23.52  32.56 41.07 49.40 -13.2  2.6
10 1370 1270 1480 0.0577  22.28  30.91 39.68 49.03 -14.0  3.6
11 1600 1480 1720 0.0577  20.15  28.58 37.70 47.65 -15.4  6.1
12 1850 1720 2000 0.0577  18.29  26.37 35.62 45.47 -16.9 10.5
13 2150 2000 2320 0.0577  16.37  24.34 33.17 43.13 -18.8 13.8
14 2500 2320 2700 0.0577  13.80  22.35 30.98 40.80 -21.2 16.8
15 2900 2700 3150 0.0577  12.21  21.04 29.01 39.15 -23.2 15.8
16 3400 3150 3700 0.0577  11.09  19.56 27.71 37.30 -24.9 14.9
17 4000 3700 4400 0.0577   9.33  16.78 25.41 34.41 -25.9 14.3
18 4800 4400 5300 0.0460   5.84  12.14 19.20 29.01 -24.2 12.4
19 5800 5300 6400 0.0343   3.47   9.04 15.37 25.17 -19.0  7.9
20 7000 6400 7700 0.0226   1.78   6.36 12.61 22.08 -11.7  4.3
21 8500 7700 9500 0.0110  -0.14   3.44  9.62 18.76  -6.0  0.5
 [1] "fi"     "li"     "hi"     "Ii"     "normal" "raised" "loud"   "shout" 
 [9] "Xi"     "Fi"    
 [1]  350  450  570  700  840 1000 1170 1370 1600 1850 2150 2500 2900 3400 4000
[16] 4800 5800
    fi Deltai   Ii normal raised  loud shout    Xi   Fi
1  250  22.48 0.06  34.75  38.98 41.55 42.50  -3.9  1.0
2  500  25.48 0.17  34.27  40.15 44.85 49.24  -9.7  1.8
3 1000  28.48 0.24  25.01  33.86 42.16 51.31 -12.5  2.6
4 2000  31.48 0.26  17.32  25.32 34.39 44.32 -17.7 12.0
5 4000  34.48 0.21   9.33  16.78 25.41 34.41 -25.9 14.3
6 8000  37.48 0.05   1.13   5.07 11.39 20.72  -7.1  1.8
normal raised   loud  shout 
 62.35  68.34  74.85  82.30