Commercial Television is 70 years old today.

[tubesrule]

Originally Posted by ppppenguin

As for interlace, Paul Marshall first brought Ulises Sanabria to my attention. This page claims he used interlace in 1926: http://www.televisionexperimenters.com/sanabria.html Not sure when baird first used interlace which he called intercalation.

Jeff,
This is true. Sanabria used a triple interlace system on his 45 line mechanical televisions, the most famous being the "Western". I have never been able to determine why he chose triple interlace versus dual. I am not aware of any other commercially available mechanical television that employed interlace.

Darryl

[cbenham]

Originally Posted by tubesrule

Jeff,
This is true. Sanabria used a triple interlace system on his 45 line mechanical televisions, the most famous being the "Western". I have never been able to determine why he chose triple interlace versus dual. I am not aware of any other commercially available mechanical television that employed interlace.

Darryl

Could he have been thinking ahead to color?
Cliff

[old_tv_nut]

Originally Posted by cbenham

Could he have been thinking ahead to color?
Cliff

I don't think triple interlace is heading in a good direction for color. Higher order interlace reduces bandwidth and large area flicker for a given resolution, but the problem is that line crawl/flicker becomes worse. Going to color either line sequential or field sequential makes these problems nearly three times worse.