21-09-2018, 12:17 PM
(This post was last modified: 21-09-2018, 12:19 PM by ppppenguin.)
David, thanks for coming over to GVR and contributing to this thread.
I doubt it would be practible to modify a complex device like a TBC unless you had some very comprehensive documentation and significant logic design skills.
The question of stable sources is not very important. From expereince we know that the BBC's CO6/509, designed for stable sources, was entirely tolerant of VHS replay. All 625 to 405 converters I've seen have been tolerant of VHS replay. Even a linestore converter imposes a measure of timebase correction, simply because the output clock will be smoothed by a PLL compared to the input clock. A framestore converter is by its nature a timebase corrector as the output clock is independent of the input. A 405 to 625 converter woul dbe no different.
As I've said before in this thread, several of us know full well how to make a 405 to 625 converter but it's a fairly big step from there to being bothered to put in the work to do it. Recovering a few odd tapes wouldn't push me to do it when an optical approach can be improvised to give a pretty good answer. About the only thing that would give me the incentive to do it would be if Paul Marshall said he would really like to be able to run Project Vivat on 405. That would realistically need 2 or 3 converters and they would have to be genuinely real time, not offline software. Paul is an old friend, Vivat is a big and complex project. I would be happy to contribute in that way.
http://projectvivat.co.uk/Vivat/Home.html
I doubt it would be practible to modify a complex device like a TBC unless you had some very comprehensive documentation and significant logic design skills.
The question of stable sources is not very important. From expereince we know that the BBC's CO6/509, designed for stable sources, was entirely tolerant of VHS replay. All 625 to 405 converters I've seen have been tolerant of VHS replay. Even a linestore converter imposes a measure of timebase correction, simply because the output clock will be smoothed by a PLL compared to the input clock. A framestore converter is by its nature a timebase corrector as the output clock is independent of the input. A 405 to 625 converter woul dbe no different.
As I've said before in this thread, several of us know full well how to make a 405 to 625 converter but it's a fairly big step from there to being bothered to put in the work to do it. Recovering a few odd tapes wouldn't push me to do it when an optical approach can be improvised to give a pretty good answer. About the only thing that would give me the incentive to do it would be if Paul Marshall said he would really like to be able to run Project Vivat on 405. That would realistically need 2 or 3 converters and they would have to be genuinely real time, not offline software. Paul is an old friend, Vivat is a big and complex project. I would be happy to contribute in that way.
http://projectvivat.co.uk/Vivat/Home.html
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
