Quote from: LordKAT on December 16, 2009, 02:38:30 PM
YUV?
No idea what it means. something about lithium and chrome or something like that
No -YUV was a component video system used in Betacam (which is actually a professional development of Betamax and became a widely used cassette system for professional use) The YUV system uses a luminance signal (Y) which is made up of R+G+B and two weighted chrominance difference signals, U which is B-Y, and V which R-Y. The missing G signal is reconstituted at the display by subtracting weighted versions of the Y U and V signals.
I think what Sandy alludes to is the earlier attempts at field sequential colour in which alternate video fields transmitted either R G or B. This was eventually superceeded by the NTSC system in the US and PAL in europe.
The two systems both rely on phase difference quadrature modulation, the only difference being that with PAL on alternate lines the phase encoding is inverted thus allowing for some degree of self correction of phase distortion resultant from reflection in the transmitted signal path.
There were also some early attempts at color made by Baird using a mechanical scanning technique with a three coloured Nipcow disk. However these were never perfected as the rival electronic scanning technique developed by Farnsworth became the universally used system.
The only other thing I can think of is that I think the space race need for lightweight cameras contributed to the development of the Plumbicon camera tube, which, on account of its extended spectral response rapidly became the mainstay of color television cameras. Earlier tubes such as the image Orthicon suffered in that they were too large, too heavy and too fragile.
There is of course also the development of colour recording techniques an replay compensators like timebase correctors that were used in the early AMPEX quadruplex VT machines (of which I was one of the last expert engineer/operators in the BBC)
Trouble is, I can't really connect all of that very well to the moon landings per-se... other than the fact that using one of the QUAD machines I once managed to accidentally cut one of the last surviving original recordings of the moon landings into confetti! OOOPS
Would you care to enlighten us all Sandy?
