Could Faroudja's chroma expansion be implented in software?

[ChiDragon]

... and would it actually improve quality if it were?

Patent US 5081521 A: NTSC color television system with improved chroma bandwidth and chroma ringing reduction (http://www.google.com/patents/US5081521)

This equipment review (http://www.hometheaterhifi.com/volume_6_2/faroudjavs50.html) offers a couple diagrams under heading "Bandwidth Expansion" and describes the effect.

[Guest]

Your patent link is dead. I found this:

http://www.google.com/patents/US5081521

[ChiDragon]

Thanks, that was the link I had in the post and then I somehow copied and pasted the title into the URL field.