Validating Perceptual Objective Listening Quality Assessment Methods on the Tonal Language Igbo
نویسندگان
چکیده
In recent years a great deal of effort has been expended to develop methods that determine speech quality through the use of comparative algorithms. These methods are designed to calculate an index value of quality that correlates to a mean opinion score given by human subjects in evaluation sessions. In this paper, we validate Perceptual Evaluation of Speech Quality (PESQ) ITU-T Recommendation P.862 and the Netherlands’s Organization for Applied Scientific Research (TNO) proposalPerceptual Speech Quality Measurement 2010 (PSQM2010) on the Perceptual Objective Listening Quality Assessment (POLQA) benchmark, which is the new ITU-T benchmarking for objective measurement of speech quality, on the tonal language Igbo –a language spoken in south easternNigeria. Experiments are done in super wideband mode and PESQ was applied to down sampled versions of the signals. The result on PESQ P.862.2 shows a good correlation between the subjective and objective measurements on the tonal language Igbo with a correlation coefficient of r = 0.88 on the overall data set. For Dutch, the model shows less correlation between the subjective and the objective measurements (r = 0.84) compared to the tonal language Igbo (r = 0.88). .The PSQM2010 is optimized for western languages and the correlation for the Dutch super wideband database is 0.91. For Igbo our super wideband result shows a poor correlation of 0.70 between the subjective and objective measurements. For the tonal and non tonal sentences no big differences are found. The correlation between the subjective results for tone and non-tone sentences is 0.96. We conclude by making recommendations for research, policies and practices.
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