A transport protocol that supports real-time communication of audio/video frames across campus-area packet switched networks is presented. It is a “best effort” protocol that attempts to ameliorate the effect of jitter, load variation, and packet loss, to provide low latency, synchronized audio and video communications. This goal is realized through four transport and display mechanisms, and a ...

This paper discusses tone perception in Vietnamese under audio only and audio plus video conditions. The lower part of a male speaker's face was recorded on digital video as he uttered 22 sets of syllabic tokens covering the six different tones of Vietnamese. In a perception study the audio signal alone, as well as audio plus video conditions were presented to native Vietnamese speakers who wer...

SoundSpotter is an open source software system for real-time matching of an audio input stream to a database of continuous audio or video. Among its novel features are real-time control over audio segmentation, feature selection and match radius. The system uses audio input to control selection of output from a database using similarity-based matching. The low latency methods employed create a ...

1 Abstract The Sound Picture Information Networks (SPIN) technology that is part of the DECspin Version 1.0 product takes digitized audio and video from desktop computers and distributes this data over a network to form real-time conferences. SPIN uses standard local and wide area data networks, adjusting to the various latency and bandwidth differences, and does not require a dedicated bandwid...

The subjective effects of controlled low frequency limitation of the audio bandwidth on assessment of audio quality were studied. The investigation was focused on the standard 5.1 multichannel audio set-up (Rec. ITU-R BS.775-1) and limited to the optimum listening position. The effect of video presence on audio quality assessment was also investigated. The results of the formal subjective test ...