Validation of the revised STIr method

• Published in: Speech communication Vol. 38; no. 3-4; pp. 413 - 425
• Main Authors: Steeneken, Herman J M, Houtgast, Tammo
• Format: Journal Article
• Language: English
• Published: 01-11-2002
• ISSN: 0167-6393
• DOI: 10.1016/S0167-6393(02)00010-9

The revised model for the speech transmission index (STIr, Speech Communication 28 [1999] 109) was validated with an independent set of 68 test conditions. For a subset of 18 conditions, including only additive noise & band-pass limiting, it was verified that STIr provides a good prediction of the CVC-word score. The additional 50 conditions included non-linear distortion, echoes, automatic gain control, & waveform coding. For conditions with these types of distortion, specific parameters of the test signal are of interest. The parameters of the STI model were tuned in an earlier study for an optimal fit between the traditional STI & the CVC score, for a similar set of transmission conditions (Journal of the Acoustical Society of America 67 [1980] 318). It was found that the parameter settings also apply to the present revised model. The prediction accuracy for both male & female speech is 4-6% when expressed in CVC-word scores. This corresponds to a signal-to-noise ratio of about 1-2 dB. 1 Table, 7 Figures, 1 Appendix, 21 References. Adapted from the source document