Past, present and future of the speech transmission index
Tammo Houtgast, Herman J. M. Steeneken, Sander J. van Wijngaarden · TNO Repository · 2002
Table of contentsTammo's and Herman's Index. An introduction by Manfred R. SchroederChapter 1. The roots of the STI approach. Tammo Houtgast and HermanJ.M. Steeneken: Introduction - Our first effort - Introduction of STI - Speech envelope spectrum and MTF - Further developments - Envelope modulation and the earChapter 2. Basics of the STI measuring method. Herman J.M. Steeneken and Tammo Houtgastective measuringmethods for predicting speech intelligibility - Measurement and calculation of the STI - Overview methods, test signals, and calculation constants - Interpretation of the STI value (subjective measures) Diagnostic features, some examples - Speech and test signallevel adjustment - Application examples. Chapter 3. Improvements of the STI method: frequency weighting, gender, level dependent masking, and phoneme specific prediction. Herman J.M. Steeneken: Introduction - Reconsideration of frequencyweighting functions - Signal-to-noise ratio dependency of the frequency weighting - Level-dependent masking - Phoneme group specific weighting functions - Validation - Conclusion and future developments.Chapter 4. Limitations of the STI method. Rob Drullman: Introduction - Distortions of the modulation transferChapter 5. Application of the Speech Transmission Index to the HearingImpaired. Joost M. Festen and Reinier Plomp: Introduction - Simple versus complex hearing versus complex hearing impairment - Trade-off between noise and reverberation for listeners with hearing loss - Syllabic compression in hearing aids - Speech reception in fluctuating noiseChapter 6. Implementation of intelligibility algorithms into acoustic simulation programs. Wolfgang Ahnert: Intelligibility measures used for comparisons - Application of intelligibility measures in EASE4.0Chapter 7. Development of an Accurate, Handheld, Simple-to-use Meter for the Prediction of Speech Intelligibility. Kenneth Jacob, Steve McManus, Jan A. Verhave and Herman J.M. Steeneken: Introduction - Speech Transmission Index (STI) considerations - STI-pa an efficient form of the Speech Transmission Index method for public addressand sound reinforcement systems - Embedded system vs. general purposecomputer - User interface - Error checkingChapter 8. Practical application of STI to assessing Public Address and Emergency Sound Systems. Peter Mapp. RASTI vs STI error analysis - Is STI an infallible indicator oficator of sound system intelligibility ?Chapter 9. Measurement and prediction of speech intelligibility intraffic tunnels using the STI. Sander J. van Wijngaarden and Jan A. VerhaveChapter 10. Standardisation of performance criteria and assessmentmethods for speech communication Herman J.M. SteenekenChapter 11. Computing the STI using speech as a probe stimulus 125Karen L. Payton, Louis D. Braida, Shaoyan Chen, Peninah Rosengard andRaymond Goldsworthy