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This paper proposes a methodology for the development of a computational quality model for IP-based audio. The project mainly focuses on two questions: 1) choice of a quality measurement scale in the computational model and mapping of this scale with existing audio quality measurement metrics, and 2) quantification of encoding and packet loss impairments (only two quality degradation parameters are...
Internet television (IPTV) is rapidly gaining popularity and is being widely deployed on the Internet. In order to deliver optimum user quality of experience (QoE), service providers need to understand and balance the trade-offs involved with user (video content, display device), application (codec type, encoding bit rate) and network (network health, router queuing discipline) factors that affect...
We present results regarding the impact on video quality of the factors: packet loss, bit rate, frame rate, and codec. The domain of this study is small-screen, mobile, low bit-rate video; the screen sizes covered are QCIF, CIF, and VGA. Bit rates are mainly in the range 64-1536 kb/s. Packet loss rates cover both typical wireline and wireless situations. The data on which this report is based come...
Forthcoming next generation networks (NGNs) introduce a new trend of integration into one all-IP platform. This process will decouple VoIP services from the network providers, introducing new service distribution aspects. VoIP devices will be enabled to seamlessly switch between wideband and narrowband speech operators and roam across diverse networks on demand, even during active calls. To design...
ITU-T P.862 - ldquoPerceptual Evaluation of Speech Quality (PESQ)rdquo is well known as an intrusive objective speech quality assessment method. Some reports have found that the PESQ time alignment mechanism fails to estimate delay where signals with high packet loss rate and dynamic time processing are present. A new time-alignment algorithm to improve the PESQ accuracy for time-scale modified voice...
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