AES E-Library

P. Mapp, "Some Practical Aspects of STI Measurement and Prediction," Paper 8864, (2013 May.). doi: P. Mapp, "Some Practical Aspects of STI Measurement and Prediction," Paper 8864, (2013 May.). doi:
Abstract: The Speech Transmission Index (STI) has become the internationally accepted method of testing and assessing the potential intelligibility of sound systems. The technique is standardized in IEC 60268-16, however, it is not a flawless technique. The paper discusses a number of common mechanisms that can affect the accuracy of STI measurements and predictions. In particular it is shown that RaSTI is a poor predictor of STI in many sound system applications and that the standard speech spectrum assumed by STI often does not replicate the speech spectrum of real announcements and is not in good agreement with other speech spectrum studies. The effects on STI measurements of common signal processing techniques such as equalization, compression, and AGC are also demonstrated and the implications discussed. The simplified STI derivative STIPA is shown to be a more robust method of assessing sound systems than RaSTI and when applied as a direct measurement method can have significant advantages over Impulse Response-based STI measurement techniques.

@article{mapp2013some,
author={mapp, peter},
journal={journal of the audio engineering society},
title={some practical aspects of sti measurement and prediction},
year={2013},
volume={},
number={},
pages={},
doi={},
month={may},} @article{mapp2013some,
author={mapp, peter},
journal={journal of the audio engineering society},
title={some practical aspects of sti measurement and prediction},
year={2013},
volume={},
number={},
pages={},
doi={},
month={may},
abstract={the speech transmission index (sti) has become the internationally accepted method of testing and assessing the potential intelligibility of sound systems. the technique is standardized in iec 60268-16, however, it is not a flawless technique. the paper discusses a number of common mechanisms that can affect the accuracy of sti measurements and predictions. in particular it is shown that rasti is a poor predictor of sti in many sound system applications and that the standard speech spectrum assumed by sti often does not replicate the speech spectrum of real announcements and is not in good agreement with other speech spectrum studies. the effects on sti measurements of common signal processing techniques such as equalization, compression, and agc are also demonstrated and the implications discussed. the simplified sti derivative stipa is shown to be a more robust method of assessing sound systems than rasti and when applied as a direct measurement method can have significant advantages over impulse response-based sti measurement techniques.},}

TY - paper
TI - Some Practical Aspects of STI Measurement and Prediction
SP - EP -
AU - Mapp, Peter
PY - 2013
JO - Journal of the Audio Engineering Society
IS -
VO -
VL -
Y1 - May 2013 TY - paper
TI - Some Practical Aspects of STI Measurement and Prediction
SP - EP -
AU - Mapp, Peter
PY - 2013
JO - Journal of the Audio Engineering Society
IS -
VO -
VL -
Y1 - May 2013
AB - The Speech Transmission Index (STI) has become the internationally accepted method of testing and assessing the potential intelligibility of sound systems. The technique is standardized in IEC 60268-16, however, it is not a flawless technique. The paper discusses a number of common mechanisms that can affect the accuracy of STI measurements and predictions. In particular it is shown that RaSTI is a poor predictor of STI in many sound system applications and that the standard speech spectrum assumed by STI often does not replicate the speech spectrum of real announcements and is not in good agreement with other speech spectrum studies. The effects on STI measurements of common signal processing techniques such as equalization, compression, and AGC are also demonstrated and the implications discussed. The simplified STI derivative STIPA is shown to be a more robust method of assessing sound systems than RaSTI and when applied as a direct measurement method can have significant advantages over Impulse Response-based STI measurement techniques.