Scan velocity modulation system with auxiliary vertical deflecti

Details Scan velocity modulation system with auxiliary vertical deflecti Scan velocity modulation system with auxiliary vertical deflecti

1993-10-29

1996-02-13

Groody, James J.

Television

Image signal processing circuitry specific to television

Transition or edge sharpeners

348629, 348625, H04N 332, H04N 544

Patent

active

054915210

ABSTRACT:
A video signal is applied to a kinescope having scan velocity modulation for improving picture sharpness in the vertical direction. Pictures from video signals of a type having non-interpolated and vertically interpolated lines (e.g., interlace-progressive up-converted) will tend to exhibit a significant reduction of sharpness in vertical direction. This problem is corrected by applying scan velocity modulation only to the interpolated lines of the video signal. Furthermore, the vertical deflection is restricted to horizontal structures or real vertical transitions, respectively. In order to have a high noise immunity of this sensitive processing, the resulting luminance amplitude of the shifted line as well as the vertical deflection is controlled to be strongly dependent on the current video signal (soft decision).

REFERENCES:
patent: 3980819 (1976-09-01), Schwartz
patent: 4080628 (1978-03-01), Jirka
patent: 5014119 (1991-05-01), Faroudja
patent: 5036401 (1991-07-01), Antonov et al.
patent: 5196941 (1993-03-01), Altmanshofer
patent: 5351094 (1994-09-01), Washine

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