Abstract
The MOS-X is a recently-developed questionnaire used to evaluate the quality of artificial speech. In this experiment, participants listened to audio files produced by concatenative text-to-speech voices for the purpose of assessing the effect of Speaker and Sampling Rate on MOS-X ratings. The concatenative voices were developed from recordings of three different human speakers (code named AF, AM, and B) and produced using two different sampling rates (8 kHz and 22 kHz). Six independent groups of raters participated, one group for each combination of speaker and sampling rate. Analyses of variance indicated a significant main effect of Voice, but no significant main effect of Sampling Rate and no significant Voice by Sampling Rate interaction. The results indicate that independent groups of raters are sensitive to speaker differences in concatenative text-to-speech (TTS) voices, but not to differences in these sampling rates.
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