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cff-version: 1.2.0
message: 'To cite package "SII" in publications use:'
type: software
license: GPL-3.0-only
title: 'SII: Calculate ANSI/ASA S3.5-1997 (R2024) Speech Intelligibility Index'
version: 1.3.0
doi: 10.32614/CRAN.package.SII
abstract: Calculates the American National Standards Institute (ANSI) S3.5-1997 Speech
  Intelligibility Index (SII) (ANSI, 1997), 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 functions 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. The package
  also includes a native C++ implementation of the 'AUDMOD' specific loudness model
  for impaired hearing (Bramslow, 2004), ported from the 'bramslow2004' implementation
  in the Auditory Modeling Toolbox (AMT), to calculate loudness in sones. It provides
  methods to predict aided SII under hearing aid prescriptive rationales, including
  Open-NL (Open Non-Linear), a theoretical optimization framework that uses a Nelder-Mead
  simplex search to maximize the SII (by default with the Johnson and Dillon (2011)
  desensitization correction), subject to loudness penalties and simulated Maximum
  Power Output (MPO) constraints. Further functions calculate real-ear insertion gains,
  estimate maximum power output (SSPL90), and prescribe dynamic range compression.
  Open-NL and the prescription functions are research tools for theoretical modeling
  and simulation; they have not been clinically validated and are not intended for
  fitting hearing aids to patients. Development of this package was originally funded
  by the Center for Bioscience Education and Technology (CBET) of the Rochester Institute
  of Technology (RIT).
authors:
- family-names: Warnes
  given-names: Gregory R.
- family-names: Shaver
  given-names: Mark
  email: mark.shaver@posteo.net
repository: https://euphonic-euphemism.r-universe.dev
commit: a27484bf4b9fbd9be1dc89fe6b6f004f71268e9d
date-released: '2026-10-03'
contact:
- family-names: Shaver
  given-names: Mark
  email: mark.shaver@posteo.net