19-08-2021, 03:50 PM
A standard TV tube has a relatively long persistance phosphor. Not long enough to blur motion but more than enough to foul up a flying spot scanner. Even the special CRTs designed for FSS had a finite persistence which had to be corrected in the electronics. Effectively an adjustable HF boost to the video.
Phosphor persistence isn't a simple exponential decay. There are at least 2 different time constants. ISTR that the Rank Cintel afterglow correctors had 5 knobs, each with a different time constant.
Phosphor persistence isn't a simple exponential decay. There are at least 2 different time constants. ISTR that the Rank Cintel afterglow correctors had 5 knobs, each with a different time constant.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
