Mean opinion score

Figure 1.14 Relation between the mean opinion score (MOS) and the cognitive corrected PAQM (PAQMC14) for the 50 items of the ISO/MPEG 1991 codec test [IS091, 1991] in loudspeaker presentation.

For measurement of the quality of telephone-band speech codecs a simplified method, the perceptual speech quality measure (PSQM), is presented. The PSQM was benchmarked together with four other speech quality measurement methods within ITU-T Study Group 12 by the NTT (Japan). It showed superior performance in predicting subjective mean opinion scores. The correlation on the unknown benchmark database was 0.98 [ITUTsgl2con9674, 1996], The PSQM method was standardized by the ITU-T as recommendation P.861 [ITUTrecP861, 1996], objective quality measurement of telephone-band (300-3400 Hz) speech codecs. 

Intelligibility testing is often performed with the modified rhyme test or semantically unpredictable sentences. While these give a measure of word recognition, care should be taken when using results from these tests to indicate performance in applications, naturalness is normally measured by mean opinion scores (MOS). 

Naturalness is normally measured by obtaining mean opinion scores (MOS). 

Scoring evaluation Once again, this level of essay leaves the reader confused and trying to unscramble the meaning behind the mistakes. There is no support for the student s opinion there is no introduction, body, or conclusion and no sentence variety or vocabulary use. There is almost nothing here to use for scoring purposes. 

The research data were analyzed using SPSS for Windows Version 17.0. Descriptive statistics used were arithmetic mean (AM) and standard deviation (SD) to interpret the comment level by applying an average score in each level on a statistical basis which is to find the range, and to use a formula for calculating the width of the interval to determine the average level of opinion as follows ... 

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