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 05:20am on BBC Radio 4 FM & DAB. It has always been in mono on its own DAB channel with a bit rate of just 64 kbit/s. BBC World Service can also be heard on BBC Radio Wales from 01:00am until 05:30am on MW and FM stereo. In the 1990s, the BBC purchased and constructed large medium wave and FM networks in the former Soviet bloc, particularly the Czech (BBC Czech Section), Slovak Republics (BBC Slovak Section), Poland (BBC Polish Section) (where it was a national network) and Russia (BBC Russian Service). It had built up a strong audience during