critical: Constants Tables for ANSI/ASA S3.5-1997 (R2024) Speech...

In SII: Calculate ANSI/ASA S3.5-1997 (R2024) Speech Intelligibility Index

Constants Tables for ANSI/ASA S3.5-1997 (R2024) Speech Intelligibility Index (SII)

Description

Tables of constants for ANSI/ASA S3.5-1997 (R2024) Speech Intelligibility Index (SII)

Usage

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

Format

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)

Details

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

Source

ANSI/ASA S3.5-1997 (R2024), "American National Standard Methods for Calculation of the Speech Intelligibility Index" American National Standards Institute, New York.

References

ANSI/ASA S3.5-1997 (R2024), "American National Standard Methods for Calculation of the Speech Intelligibility Index" American National Standards Institute, New York.

Examples

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

SII documentation built on Sept. 12, 2026, 5:08 p.m.