3D (was: Voice recognition will never kill the keyboard was:

Old Euorpen TVs did, indeed have a 50Hz flicker (interlaced scanning, 25 complete pictures per second). Actually, you got used to it, and it wasn;t annoying on most TV programmes. Using them for computer displays was somwewhat woese :-) Some of the more recent upmarket CRT-based TVs had a built-in framestore and scan doubler, and has 100Hz rather than 50Hz flicker. It was better, but not enough IMHO to justify the prices of the set. Of coure with LCD and Plasma displys the scan rates can be just aobut anything... [...] > > I do have a couple of sets of LED spectacles and the (fairly simple) > > control unit for use with muy E&S PS390. One day I must get round to > > getting all that working again... > OK, I understand the principle behind LCD shutter glasses. And they > certainly were a major step up from Lipton's original spinning wheel. > But how do LED spectacles work? They don't, and nor do I, apparently. I meant LCD spectacles, of course. IMHO this unit is not up to the normal E&S standards. The control box is very simple, it uses an LM1881 or similar to get the vertical sync pulse form the sync-on-green video signals, feeds that into a divide-by-2, and uses the ouputs from that, along with some XOR gates to drive the LCDs. Thing is, there';s not absolut sync reference, it just changes shuters after every vertical scan. So you may well get the wrong picture for each eye. There's a button on the front of the control unit to reverse the shutters, if the picture looks wrong (comes towards you ratehr than goes away), you frob this. A bit of a kludge... -tony