What is this ?
Types of color spaces
composite sync, where the horizontal and vertical signals are mixed together on a separate wire (S)
separate sync, where the horizontal and vertical are each on their own wire (HV)
RGsB / SoG
sync on green, where a composite sync signal is overlaid on the wire used to transport the green signal
sync on red or sync on blue, where a composite sync signal is overlaid on either the red or blue wire