It is concluded that high quality performance is related to a complete intonation modeling of di erent type of phrase length and styles. General quality evaluated by MOS and intelligibility evaluated by SUS presented no appreciable di erences between S1 and S2. Results of ITU test showed better quality and intelligibility responses for system S2. One is the P.85 recommendation by the International Telecommunication Union (ITU), the second method, called Syntactically Unexpected Sentences (SUS), is known to be the most strict for intelligibility evaluation, and the third is the Mean Opinion Score (MOS) scale. We compare it with two commercially available systems (S2 and S3) using three di erent evaluation methods. This work summarizes the perceptual evaluation of our recently developed textto- speech system (S1), based on unit concatenation.
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