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A regional variation generally refers to times when a radio station or television station simultaneously broadcasts different programmes, continuity or advertisements to different parts of its coverage area. This may be so as to provide programming specific to a particular region, such as local news or may be so as to allow advertisements to be targeted to a particular area. Some regional variations are the consequence of a federal style television network or radio network where a local station is part of a larger broadcast network and broadcasts the network's programmes some of the time and its own programming the rest of the time. The latter is therefore sometimes considered a regional variation. Examples of this include the UK's ITV network throughout much of its history, and American network affiliate stations. Regional variation is also a common term used in British television listings publications, such as magazines and newspapers, to show the different programmes broadcast in different areas of the country. ==Regional variations in the United Kingdom== The BBC has traditionally offered regional variations across many of its services. The Home Service and its successor Radio 4 provided regional variations until the late 1970s when Local Radio took over most of these responsibilities. BBC One and the BBC Television Service have provided variations in the English regions throughout most of their history, and continues to do so today (mainly News and current affairs programming). In Scotland, Wales and Northern Ireland, BBC One has to a large degree been operated as a separate television channel, rather than a variant on BBC One as broadcast in England. BBC Two has in the past broadcast variations within the English regions, though now only has variations for each of the Constituent Countries of the United Kingdom. BBC Choice also briefly had regional variations for these areas. ITV was originally established as a network of some 14 separate companies, each designated a region of coverage (see History of ITV). Each company provided a mixture of local programming for its own coverage area, as well as airing nationwide networked programmes (usually produced by one of the contractors). ITV has traditionally included more regional variations than the BBC, though since consolidation and majority ownership by ITV plc regional variations on the network are far fewer, and often no more than the minimum requirements as set by Ofcom. Channel 4 and Channel Five provide no regional variations for programming or continuity, but offer variation during advertising breaks. S4C provided an alternative to Channel 4 in Wales, and broadcasts some of Channel 4's programmes, both simultaneously and slightly behind; though this is technically not a regional variation, rather a separate station in its own right, it is nonetheless frequently described under the heading of 'regional variations' in many newspapers and magazines. In 2009, S4C ceased from broadcasting Channel 4 programmes altogether when analogue television transmitters in Wales were switched off as part of the United Kingdom-wide Digital switchover. Sky News and Sky1 also provide a variant of their stations for the Republic of Ireland, although specific Sky News coverage for the Republic of Ireland is extremely limited, due in part to the channel with Irish content closing on 3 November 2006, and Sky1's variant is purely an advertising opt-out. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「regional variation」の詳細全文を読む スポンサード リンク
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