Teletext and to pad out the fixed packet. The vertical caption position is determined by the packet address. In the case of the Ceefax and ORACLE systems and their successors in the UK, the teletext signal is transmitted as part of the ordinary analog TV signal but concealed from view in the Vertical Blanking Interval (VBI) television lines which do not carry picture information. The teletext signal is digitally coded as 45-byte packets, so the resulting rate is 7,175 bits per second per used lines (41 7-bit 'bytes' per line, on each of 25 frames per second). A teletext page comprises
The Forum (BBC World Service) frequently entertaining and insightful. The 60 Second Idea and the discussion it produces is released as a podcast. The first episode of the show was broadcast on the BBC World Service 6 April 2008. It has been broadcast every week since then. The programme's presenter, who has been part of the show since its inception, is former BBC diplomatic correspondent Bridget Kendall. "The Forum" is broadcast through the BBC World Service and its international broadcasting partners. The show is also available online, to download and as a podcast. All previous shows are archived online. Previous guests include: The Forum (BBC