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
BBC World Service 2012 and the final broadcast from Bush House was a news bulletin broadcast at 11.00GMT on 12 July 2012. The BBC World Service encompasses an English 24-hour global radio network and separate services in 27 other languages. News and information is available in these languages on the BBC website, with many having RSS feeds and specific versions for use on mobile devices, and some also offer email notification of stories. In addition to the English service, 18 of the language services broadcast a radio service using the short wave, AM or FM bands. These are also available to listen live