4TV were a design company who developed a reference design for a twin tuner Freeview PVR. They then sold this same design so it became the basis of the Fusion 100, Thomson DHD4000, Inverto 7000, Fusion 150, Fusion 200, Fusion 145 and, most recently, Sony <something or other>-500
To stifle competition (it is rumoured) most recently Thomson bought out 4TV
4TV continues to operate in one sense in that all their designs (unlike most other Freeview PVRs) do not get their EPG data from the continuously broadcast DVB-SI data that just caters for 7 days of EPG but, instead, the gnomes in "4TV Towers" type in 14 days worth of the Radio Times every day and package this up into a big chunk of data. This data is then downloaded (on channel 305 - MuxD) to all the 4TV boxes at about 03:20 every morning. The advantage is that they have 14 days, not just 7 days of EPG and that the entire calendar of data is held on the hard drive and is immediately available as soon as you switch the box on, the disadvantage (supposedly) is that if schedules change after the download the box has no way of knowing, experience shows that this is rarely actually a problem.
It's actually a great little system and the fact that Sony are now on board kind of gives some guarantee that it will continue to operate for a while yet as Sony are unlikely to let a situation develop where THEIR pvr can't get it's daily schedule download.
The one unknown is whether 4TV (the box developers) are going to go on and produce any new designs (presumably under the auspices of "Thomson") as all the existing boxes are now getting on for 2 years+ old (even the Sony is nothing much more than a rebadge). The advantage of 2yr+ boxes is that, on the whole, their softwares are nice and stable now after a few corrective downloads.
Beko-Digifusion for example have now moved on and there most recent boxes (90 / 95) are actually from a different box design company call Access Devices who are actually getting their more recent products badged under loads of different names.
Cliff
Last edited by CJL : 08-08-2006 at 18:10