ESEIG - FE - Comunicações em eventos científicos
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Browsing ESEIG - FE - Comunicações em eventos científicos by Author "Garcia-Mateo, Carmen"
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- An automatic voice pleasantness classification system based on prosodic and acoustic patterns of voice preferencePublication . Coelho, Luis; Braga, Daniela; Sales-Dias, Miguel; Garcia-Mateo, CarmenIn the last few years the number of systems and devices that use voice based interaction has grown significantly. For a continued use of these systems the interface must be reliable and pleasant in order to provide an optimal user experience. However there are currently very few studies that try to evaluate how good is a voice when the application is a speech based interface. In this paper we present a new automatic voice pleasantness classification system based on prosodic and acoustic patterns of voice preference. Our study is based on a multi-language database composed by female voices. In the objective performance evaluation the system achieved a 7.3% error rate.
- Kalman tracking linear predictor for vowel intelligibility enhancement on european portuguese HMM based speech synthesisPublication . Coelho, Luís; Braga, Daniela; Garcia-Mateo, CarmenThe recent developments on Hidden Markov Models (HMM) based speech synthesis showed that this is a promising technology fully capable of competing with other established techniques. However some issues still lack a solution. Several authors report an over-smoothing phenomenon on both time and frequencies which decreases naturalness and sometimes intelligibility. In this work we present a new vowel intelligibility enhancement algorithm that uses a discrete Kalman filter (DKF) for tracking frame based parameters. The inter-frame correlations are modelled by an autoregressive structure which provides an underlying time frame dependency and can improve time-frequency resolution. The system’s performance has been evaluated using objective and subjective tests and the proposed methodology has led to improved results.