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CBBC Choice
BBC Choice was a British digital television channel which was owned by the BBC and was launched on 23 September 1998. It was the first British TV channel to broadcast exclusively in digital format, as well as the BBC's second non-analogue-terrestrial channel launch (following on from the BBC News channel in 1997). At launch, BBC Choice mainly existed to supplement existing programming on BBC One and Two, with some low-profile original programming of its own. However, faced with low ratings for both Choice and BBC Knowledge, in 2000 the BBC's digital strategy changed. Under new controller Stuart Murphy, the channel began to aim specifically at a young adult audience. The BBC ultimately planned to replace the channel with the higher-profile BBC Three, which, after some delay, began broadcasting in February 2003. History Launch When BBC Choice launched, no digital TV receivers were available to the general public as Sky Digital and ONdigital had not yet launched. Instead, the lau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
576i
576i is a standard-definition television, standard-definition digital video mode, originally used for digitizing analog television in most countries of the world where the utility frequency for electric power distribution is 50 Hz. Because of its close association with the legacy color encoding systems, it is often referred to as PAL, PAL/SECAM or SECAM when compared to its 60 Hz (typically, see PAL-M) NTSC-colour-encoded counterpart, 480i. The ''576'' identifies a vertical resolution of 576 lines, and the ''i'' identifies it as an Interlaced video, interlaced resolution. The field rate, which is 50 Hertz, Hz, is sometimes included when identifying the video mode, i.e. 576i50; another notation, endorsed by both the International Telecommunication Union in BT.601 and SMPTE in SMPTE 259M, includes the frame rate, as in 576i/25. Operation In analogue television, the full Raster scan, raster uses 625 lines, with 49 lines having no image content to allow time for cathode r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
