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Terrestrial Broadcasting
Terrestrial Television, Digital and Analogue
Digital Cable TV vs Digital Terrestrial TV
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<blockquote data-quote="spiney" data-source="post: 193021" data-attributes="member: 192438"><p>Hmmmm ....... </p><p></p><p>There's;</p><p></p><p>1) The bit common to all digital tv, MPEG2 (de) coding.</p><p></p><p>2) The bit that's different for each delivery system (modulation method).</p><p></p><p>That's because conditions are different in each case! For example, satellite needs wide bandwidth to cope with low power transmission, whereas the problem with terrestrial is mutlipath propogation (hence COFDM), and cable delivers at much higher power with low noise (in which respect, it's more like DVD than broadcasting!).</p><p></p><p>Some manufacturers have tried to "re-use" the MPEG bit for different systems, eg Fortec's Diamond sat/terr receivers, but that's a bit like taking the petrol engine out of your bike in order to use the lawnmower (!), really it's not worth bothering, a different box each time is much more convenient.</p></blockquote><p></p>
[QUOTE="spiney, post: 193021, member: 192438"] Hmmmm ....... There's; 1) The bit common to all digital tv, MPEG2 (de) coding. 2) The bit that's different for each delivery system (modulation method). That's because conditions are different in each case! For example, satellite needs wide bandwidth to cope with low power transmission, whereas the problem with terrestrial is mutlipath propogation (hence COFDM), and cable delivers at much higher power with low noise (in which respect, it's more like DVD than broadcasting!). Some manufacturers have tried to "re-use" the MPEG bit for different systems, eg Fortec's Diamond sat/terr receivers, but that's a bit like taking the petrol engine out of your bike in order to use the lawnmower (!), really it's not worth bothering, a different box each time is much more convenient. [/QUOTE]
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Terrestrial Broadcasting
Terrestrial Television, Digital and Analogue
Digital Cable TV vs Digital Terrestrial TV
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