Objective evaluation model of telephone transmission performance for fundamental transmission factors
Naotoshi Osaka, Kazuhiko Kakehi · Electronics and Communications in Japan (Part I Communications) · 1986
Abstract A model to estimate the opinion scores for overall satisfaction level of speech quality is an effective tool in designing telephone networks and equipment. This paper proposes a telephone transmission performance evaluation model named OPINE. It deals with fundamental factors (loss, noise, room noise, frequency band limitation) that degrade telephone transmission performance. Three psychological factors affecting performance are selected: 1) impairment of speech for band limitation; 2) effective loudness loss or excess of speech; and 3) noisiness during speech interval and non‐speech interval. After finding PI (Performance Index) that expresses the degradation degree of performance for each factor from the spectra of sound and noise in the ear, MOS (Mean Opinion Score) is predicted. The model was applied to the experimental data. As a result, it is shown that the predicted MOS agrees fairly well with the subjectively evaluated MOS, where the standard deviation between these is 0.28.