Calculate ANSI S3.5-1997 Speech Intelligibility Index

This package calculates ANSI S3.5-1997 Speech Intelligibility Index (SII), a standard method for computing the intelligibility of speech from acoustical measurements of speech, noise, and hearing thresholds. This package includes data frames corresponding to Tables 1 - 4 in the ANSI standard as well as a function utilizing these tables and user-provided hearing threshold and noise level measurements to compute the SII score. The methods implemented here extend the standard computations to allow calculation of SII when the measured frequencies do not match those required by the standard by applying interpolation to obtain values for the required frequencies -- Development of this package was funded by the Center for Bioscience Education and Technology (CBET) of the Rochester Institute of Technology (RIT).


VERSION 1.0.3 (2013-12-06)

  • Remove obsolete .First.lib() function to comply with current CRAN package requirments.

VERSION 1.0.2 (2011-09-01)

  • Update Greg's email address.

  • Minor changes to comply with new package standards

VERSION 1.0.0 (2010-07-22)

Initial public release.

No known bugs.

Reference manual

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install.packages("SII") by Gregory R. Warnes, 3 years ago

Browse source code at

Authors: Gregory R. Warnes

Documentation:   PDF Manual  

GPL-2 license

Suggests splines, gdata, xtable

See at CRAN