TV and VBI Data Transmission

• WebTV: Internet (WWW, email) access through the television screen and a modem, but it limits the web to the consumer model of TV.

  About 40 mio. PCs, 300 mio. TVs, 100 mio. households. Seidman

• Intercast, delivery of Internet content via the TV vertical blanking interval (VBI) to the PC, e.g., WavePhore and PBS; also cable set top box, e.g., WorldGate at 192 kb/s
• TV Data Broadcasting - Point-to-Multipoint Data Communications; explains principles of VBI: uses lines 10 through 20, with line 21 used for closed-captioning. Each VBI line carries a datarate of 288 bits per field, with 64 bits for set-up and addressing, yielding a raw data rate of 185 kb/s. FEC reduces the capacity to 150 kb/s.
• Companies Plan to Send Web Data Along With Television Signals: VBI, embedded in image, part of image
• NetGem NetBox, similar to WebTV

TV