Summary

Recommendation ITU-T P.834.1 describes an extension of the methodology for deriving equipment impairment factors from instrumental models of Recommendation ITU-T P.834. It is intended that it primarily be applied to determine wideband equipment impairment factors Ie,wb, capturing the degradation introduced by wideband speech codecs. The resulting wideband equipment impairment factors derived by this methodology are intended to be used on the extended transmission rating scale underlying the E-model (see Appendix II of Recommendation ITU-T G.107). They will reflect the auditory impairments of the corresponding equipment in a listening-only mode.

The present methodology makes use of instrumental models (so-called "objective methods"), e.g., of the model defined in Recommendation ITU-T P.862.2. It is to be considered as supplementary to the methodology based on auditory listening-only tests, described in Recommendation ITU-T P.833.1. It will provide valid Ie,wb values only for those codecs for which the used instrumental model produces meaningful estimations.

Speech material associated to this Recommendation is freely available on ITU-T test signal database at www.itu.int/net/ITU-T/sigdb. It is also available on a CD-ROM attached to the paper version of this Recommendation.