RGB to YUV easily built?

[marquisor]

hello!

as i got a decent YUV -> VGA Box here with a great quality output, i wanted to ask if it would be easy building a RGB -> YUV converter. what means putting consoles, amiga etc. to VGA.

i crawled after an IC and found this: TA1287
it supports RGB in, some switch/mixing capabilities and YUV out. what circuitry would i need to build around, maybe someone did experiments with that yet?!

also is the video bandwidth of 30 MHz enough?! and the lack of composite input?! would i have to set a sync on green up for this converter?

thx in advance
regards

[l_oliveira]

The purpose of that part is add OSD (on screen display) from a microcontroller (output as an RGB signal) into a YUV stream. While forcing it to aways consider input from the RGB portion might work, It's not something you might be sure as OSD usually is only displayed on a portion of the screen.


Anyway if it's a easy to find part, it's worth trying.

Great find by the way

[viletim]

marquisor,

No, it's completely unsuitable. The component video connections use the YPbPr colour space (as defined in the SDTV standards) which is different from the YUV and YIQ colour spaces used for PAL and NTSC video. The TA1287 is a part designed for PAL and NTSC receivers, before the advent of component video and SDTV.

http://www.equasys.de/colorconversion.html

The second reason why the TA1287 is no good (if you need one), is that it cannot drive the input of a TV's component input without a driver/amplifier circuit.