Vincent Barriac

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Recommended by Ricardo Merched We propose an objective method to assess speech quality in the conversational context by taking into account the talking and listening speech qualities and the impact of delay. This approach is applied to the results of four subjective tests on the effects of echo, delay, packet loss, and noise. The dataset is divided into(More)
Recently, new objective speech quality evaluation methods which integrate perceptual dimensions have been developed in order to provide diagnostic information about specific aspects of the transmission systems' quality. In this paper, we present two approaches, one (DIAL) built explicitly on blocks corresponding to perceptual dimensions and the other one(More)
This paper proposes an approach to model the conversational speech quality and an optimisation of this approach to some practical cases. A new subjective test has been designed to study the relationship between conversational speech quality and talking, listening and interaction qualities, when facing echo and delay. The results show that, in these(More)
In this paper, an audiovisual quality assessment experiment was conducted on audiovisual clips collected using a PC-based videoconferencing application connected via a local IP network. The analyses of experimental results provided a better understanding of the influence of network impairments (packet loss, jitter, delay) on perceived audio and video(More)
This paper presents a study about the performance of Quality Degradation Indicators (QDIs) developed to diagnose and quantify the effect of time-varying degradations pertaining to the “Continuity” dimension of voice quality in the context of Super wideband (50-14000 Hz) telephony. This dimension is subdivided into three sub-dimensions:(More)
This paper presents the performance of quality degradation indicators to be used in the context of super-wideband (50-14000 Hz) telephony. After an overview of these indicators, two analyses are undertaken: the first one considers conditions containing a single degradation and the second one considers conditions comprising several degradations at the same(More)