13-01-2025, 11:38 AM
(This post was last modified: 13-01-2025, 11:44 AM by ppppenguin.)
Thanks for the advice on getting better results from my S22.
Line pairing is where the 2 fields don't interlace. The 2 fields sit on top of each other rather than being interlaced so you get larger gaps between lines. It can be caused by a source that isn't properly interlaced or by a poor sync separator. Worse still is reverse interlace which makes diagonals and curves look very odd. This is always down to the source. In my 405 generation and conversion experiments the field order has always been something I've made easily tweakable. Sometimes it's easier to try both ways to see which is correct.
100ns sample timing is entirely adequate. If you sample too slowly then it will only really affect the resolution gratings. I think I can see some aliasing on them, possibly due to them being nearer square waves than sine waves on the source data.
Don't ask me to define it accurately here, but there's a subtle difference to the way the line numbers work on 625 and 525 systems. Both are interlaced and use half lines but in one of them the first field is vertically above the second. The other is the other way round. This caused me a lot of grief years ago when I was doing 625<>525 conversion. AFAIK, 625 and 405 are the same way round as each other. IBA Tech Review volume 2 is a useful reference for 625 and can be found here: https://u.pcloud.link/publink/show?code=...4636614185&tpl=publicfolderlist If that link doesn't work then go via here: https://ntlpa.org.uk/history/ For 405 just remember it's 202.5 lines per field rather than 312.5 for 625.
Line pairing is where the 2 fields don't interlace. The 2 fields sit on top of each other rather than being interlaced so you get larger gaps between lines. It can be caused by a source that isn't properly interlaced or by a poor sync separator. Worse still is reverse interlace which makes diagonals and curves look very odd. This is always down to the source. In my 405 generation and conversion experiments the field order has always been something I've made easily tweakable. Sometimes it's easier to try both ways to see which is correct.
100ns sample timing is entirely adequate. If you sample too slowly then it will only really affect the resolution gratings. I think I can see some aliasing on them, possibly due to them being nearer square waves than sine waves on the source data.
Don't ask me to define it accurately here, but there's a subtle difference to the way the line numbers work on 625 and 525 systems. Both are interlaced and use half lines but in one of them the first field is vertically above the second. The other is the other way round. This caused me a lot of grief years ago when I was doing 625<>525 conversion. AFAIK, 625 and 405 are the same way round as each other. IBA Tech Review volume 2 is a useful reference for 625 and can be found here: https://u.pcloud.link/publink/show?code=...4636614185&tpl=publicfolderlist If that link doesn't work then go via here: https://ntlpa.org.uk/history/ For 405 just remember it's 202.5 lines per field rather than 312.5 for 625.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
