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Given by Januasz Bulawa,Tom Stachowiak at Rome Lab Quarterly Review for CIV on October 1 96. Foils prepared 22 February 97
Outside Index
Summary of Material
| OpenDVE (InSoft Technology) Basis |
| Architecture of Conference Manager |
| Summary of NPAC VIdeo and Audio Conferencing System |
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CIV Videoconferencing
InSoft OpenDVE
Insoft OpenDVE
Conference Manager
Video Tool
Audio Tool
Outside Index
Summary of Material
HTML version of Basic Foils prepared 22 February 97 
Full HTML Index
| Januasz Bulawa,Tom Stachowiak |
HTML version of Basic Foils prepared 22 February 97 
Full HTML Index
| Basic functionality: |
| session management |
| event distribution |
| data distribution |
| System features: |
| commonality |
| modularity |
| platform neutrality |
| interoperability |
| Collaborative environment |
HTML version of Basic Foils prepared 22 February 97
Full HTML Index
| OpenDVE Architecture |
| AUDIO PLUGIN |
| VIDEO PLUGIN |
| WHITEBOARD |
| CONFERENCE MANAGER |
| OpenDVE Library API |
| OpenDVE Conference Engine |
| Network Layer |
HTML version of Basic Foils prepared 22 February 97
Full HTML Index
| Architecture of Conference Manager integrated with Netscape browser |
| CM PLUGIN |
| HTML server |
| Initiator side |
| Participant side |
| DAEMON |
| CM PLUGIN |
HTML version of Basic Foils prepared 22 February 97
Full HTML Index
| Video tool features: |
| uses two types of compression - H.261 and H.263 |
| takes advantages of the H.263 codec on fast machines |
| for slower machines enables switching to the faster H.261 compression |
| H.263 vs. H.261 |
| the same quality with 30-50% of bits usage |
| half pixel prediction |
| negotiable options: unrestricted motion vector, advanced prediction, syntax-based arithmetic coding, PB-frames |
HTML version of Basic Foils prepared 22 February 97
Full HTML Index
| Audio Tool features: |
| uses two types of compression: GSM 06.10 speech codec and Intel/DVI ADPCM codec |
| GSM codec offers better compression ratio but worse speech quality - it is good for less reliable networks |
| ADPCM compresses audio just four times but it has much better quality |
| GSM 06.10 codec |
| used in digital cellular telephony standard |
| based on the RPE-LTP compression algorithm |
| Intel/DVI ADPCM codec |
| less computionally intensive than G.721 |
| produces very good quality for voice signals and reasonably good quality for music |