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MOS and Pair Comparison Combined Methods for Quality Evaluation of Text-to-Speech Systems

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The overall quality of three Text-To-Speech (TTS) synthesis systems for Italian with common prosodic control but different diphones and synthesizers was evaluated by means of the combined application of Mean Opinion Score and Pair Comparison methods. Direct comparison between the two methods serves to validate MOS, which is the technique recommended by CCITT for synthesis evaluation. In the MOS experiment, assessment also included three types of natural speech (normal and degraded) as reference. Eighteen subjects expressed 2880 MOS judgements and made 720 comparisons in all. The results obtained from the two methods showed good agreement. The most important MOS voice parameters used by listeners for differentiating the systems were Global Impression, Voice. Articulation and Pronunciation. The diphones appeared to contribute most to the different judgements, whereas synthesizers were not perceived as different by listeners. This experiment provides positive verification of interlaboratory reproducibility of MOS, which proved to be an effective technique for overall assessment of TTS quality.
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Document Type: Research Article

Publication date: 01 July 1996

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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