Quote:
Originally Posted by SpOeK!
One of the VCR that I'm using it's a Funai 25A-750. Following the same idea of finding the logic in charge of the Y/C mix and maybe intercepting the signals before this mix was carried on I've been able to get the service manual.
I've located the IC301 (LA71750EM) in charge of all these tasks. One pin (25) seems to carry " PB C OUT (Playback Chroma out?)" but sadly I still haven't found a similar pin for the Luminance. Best chance right now is pin 46 which is dubbed VCA-OUT but I'm just guessing without the proper datasheet.  |
http://elektrotanya.com/funai_25a-75.../download.html
I see Y before delay processing available on pin 46 (IC301 - Y/C combining is performed by IC internally) - Y delay is 1 line long easy to implement in software.
http://www.datasheetarchive.com/dl/D...SA00350070.pdf
I would advise to use buffered signals (video opamps are cheap and widely available today).
Your current problem with S-Video capture can be solved by removing chroma signal in frequency domain from luma plane (defreq?).