The characters and graphics from a teletext/data transmission decoder are synthetically combined with {HEAD ~ the portions} of {TAIL ~ the images} of the video signals for blank zones of the screen by the synthesizing circuit 
of
The characters and graphics from a teletext / data transmission decoder are synthetically combined with { HEAD ~ the portions } of { TAIL ~ the images } of the video signals for blank zones of the screen by the synthesizing circuit
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH