Standard cameras output composite video, either NTSC or PAL, then depending upon what type of ROV you’ve got either go straight up a coax in the umbilical, which is not so much used these days, get converted to a balanced signal and sent up a twisted pair in the umbilical, used on small ROVs, or more often than not these days are converted with lots of other signals (digitised) and sent up a fibre in the umbilical, they then pop out at the surface from another converter as composite video. The main company that does the digitisers is Focal Technologies, part of Moog in Canada.
HD is becoming more prevalent but standard fair in ROVs these days is still composite video.
Martin
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