H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/48
H04N 5/14 (2006.01) H04N 11/24 (2006.01)
Patent
CA 1256981
27371-147 ABSTRACT OF THE DISCLOSURE A method for increasing image resolution in a compatible television system, in which system an optical image is scanned along vertically spaced horizontal raster lines by a high definition television camera, the resulting picture signal is subjected to a horizontal frequency band limitation for trans- mission over a transmission channel having a given bandwidth. The method includes: sampling the resulting picture signal in the direction of horizontal frequencies in the spatial domain with a horizontal sample spacing corresponding to the vertical spacing between adjacent lines of the resulting picture signal; effecting two-dimensional filtering of the sampled picture signal with respect to two mutually transverse diagonals of the scanned image; offset modulating the filtered picture signal and band limiting the filtered picture signal to the bandwidth of the transmission channel, to produce a modified picture signal containing compon- ents capable of causing interference in a compatible receiver; and imparting to the components capable of causing interference a relatively reduced amplitude. P 34 35 265.1 E7/Spe/ki BK 84/87
491426
Fetherstonhaugh & Co.
Grundig E.m.v. Elektro-Mechanische Versuchsanstalt Max Grundig H
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