Television signals

Details Television signals Television signals

1989-07-28

1991-10-01

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358133, 358141, H04N 1102

Patent

active

050538578

ABSTRACT:
In order to achieve increased resolution and to minimise cross-colour and cross-luminance effects in a PAL, NTSC or SECAM encoded signal, a high definition source (20) is pre-filtered at a higher line rate according to one of at least two methods (22, 24, 26). The filtered signal is sub-sampled (at 30, 32) at the source line standard where necessary, depending upon the degree of bandwidth reduction employed and one of the methods of pre-filtering and sub-sampling selected according (at 34) to a control signal (36) dependent on picture content. The luminance and chrominance components of the selected encoded signal are band pass filtered (46, 50, 52) and the chrominance signal modulated onto a sub-carrier (54) such that the frequency spectrum of the luminance and chrominance signals do not overlap.

REFERENCES:
patent: 4873573 (1989-10-01), Thomas
patent: 4884138 (1989-11-01), Storey
patent: 4931855 (1990-06-01), Salvadorini
patent: 4942466 (1990-07-01), Sandbank
N.T.I.S. Tech. Notes, Oct. 1987, p. 951, Springfield, VA., U.S.; R. H. Marchman: "Reducing Color/Brightness Interaction In Color Television".
I.E.E.E. Transactions on Consumer Electronics, vol. CE-33, No. 1, Feb. 1987, IEEE, New York, N.Y., U.S.; R.J. Iredale: "A Proposal for a New High-Definition NTSC Broadcast Protocol".
SMPTE Jounal, vol. 96, No. 8, Aug. 1987, White Plans, N.Y., U.S.; William F. Schreiber: "Improved Television Systems: NTSC and Beyond".
BBC Research Department Report Number BBC RD 1986/5, Jun. 1986, R. Storey, HDTV Motion Adaptive Bandwidth Reduction Using Datv.
BBC Research Department Report Number BBC RD 1975/36, Dec. 1975, J. O. Drewery, The Filtering of Luminance and Chrominance Signals to Avoid Cross-Colour in a Pal Colour System.
I-Pal: a Compatible Variant of PAL, Free of Cross Effects and with Enhanced Horizontal Definition in the Luminance, G. Holoch, P. Janker and N. Mayer, No. 209, Feb. 1985.
IEEE Transactions on Communications, vol. Com. 32, No. 8, Aug. 1984 Extended Definition IV Fully Compatible With Existing Standards, Takahiko Fukinuki and Yasuhiro Hirano.

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