Video vector & Video Waveform


stupid question may be, on video vector, what do U and V represent, and IRE on Video waveform? ?
Nothing urgent. Thanks


U and V are usually the chrominance co-ordinates in PAL - presumably it’s actually showing Cb vs Cr.

IRE is the Institute of Radio Engineers which ceased to exist in 1963. They standardised a scale to be used for video levels for PAL and NTSC - it made it easier than discussing mV.

For more modern formats, % is usually used - IRE isn’t used in the specs for HD or UHD.

Many thank’s

I would treat IRE as a percentage with black at 0% and nominal peak white at 100%.

The PAL and NTSC rules were for analogue signals and are no longer used.