[Ronja] Further lcd thoughs...

[ronjalist]

The 3rd option is by far the best but to reach 25Mhz usually involves 
some mix of fpga/dsp/??? which are expensive and complicated to play 
with....

I remain convinced that there must be another less expensive more 
practical io route.

A vga port for example can be used (depending on video card support) to 
generate a hdtv signal - if it can do that I suspect that it may be an 
outbound route - now need and inbound .....



Thomas Egenhofer wrote:
> if you want to imporve speed without breaking range or ending up with an
> expensive and impossible to use system. you have basically 3 choices:
> 1st. increase switching speeds of your transmitter/receiver. which is
> most likely only possible with laser-diodes without further trouble.
> -would require quite some changes to the existing hardware.
> 
> 2nd. you you several different colors to transmit several bits paralell.
> -requires advanced optical system which i would prefer not to use.
> 
> 3rd. and probably the most reasonable choice. use several light-levels
> for encoding the signal. 3-level encoding like the standart 100mbit
> network does sounds possible to me. requires a completely new
> transmitter and receiver. but has potential to make even autoneg working
> to some extend (since the idle signal would be missing on 10mbit
> connections its not fully operational, but 100mbit link should be ok
> just like that).
> 
>> Content-Type: text/plain;	charset="us-ascii";	format="flowed"
>>
>> In reply to self :
>>
>> Most webcams are at best 640x480 at 30fps.
>> And as we would running monochrome (sans ir filter) there is simply not 
>> enough bandwidth to make it sensible.
> webcams or cemras in general. even if you manage to project your image
> over several hundret meter (try with a beamer if you have one) , allign
> it would be very difficult, even if you use 3x3 or 4x4 pixels for each
> bit. syncronising the refresh rates of both would be another issue.
> guess the resulting link would be extremly unstable.using a tv-remote is
> easyer, and in the end you might get more data transmitted with it.
> 
>