Television systems and subsystems therefore

Details Television systems and subsystems therefore Television systems and subsystems therefore

H - Electricity

04

N

350/56

H04N 5/44 (2006.01) H04N 9/04 (2006.01)

Patent

CA 1225145

ABSTRACT TELEVISION SYSTEMS AND SUBSYSTEMS THEREFOR An image is scanned by a color camera (800-808) and the luminance representative signals (e.g. Green) of pairs of adjacent lines are summed and differenced in a processor 861. Color signals R,G,B and the sum signal (GS) are matrixed to form chrominance components and luminance components of a standard composite video signal (e.g. I,Q, YS for NTSC) in a matrix 812. One of the chrominance components (I) is comb filtered (1112) to remove portions of its frequency spectrum. The difference signal ( G .DELTA. ) is comb filtered (1122) to be inserted (1124) into the removed portions of the chrominance component (Fig 11). A receiver (Fig 9) of such a composite signal comprises an adder (934) and a subtractor (935) together with a weighting circuit (935) for summing and differing the summed and differenced signals to reproduce the original luminance signals, which are then displayed on a display (921). In a compatible high definition system first ones (L1, L2) of the pairs of lines conform to a standard TV system (e.g. NTSC) and the second ones (L1A, L2A) are offset by e.g. ? of the standard interline spacing. In an example of the high definition system, the pairs of lines are sampled by a sinusoidal scanning path the samples from the lines being derived by a synchronous switch (618) (Fig. 6). The difference signal (G .DELTA. ) is invisible on a conventional receiver but allows high vertical defintion on the receiver of the invention.

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