Screen detecting system of a wide screen television for detectin

Details Screen detecting system of a wide screen television for detectin Screen detecting system of a wide screen television for detectin

1996-01-17

1996-12-03

Lee, Micheal H.

Television

Basic receiver with additional function

Multimode

348556, 348913, H04N 546

Patent

active

055813046

ABSTRACT:
A screen detecting system of a wide screen television for detecting blank top and bottom areas of a video frame contained in conventional video signals and generating top and bottom display limits is disclosed. The top and bottom display limits are used by a display control system of the wide screen television to eliminate the blank top and bottom areas. The screen detecting system comprises a comparator for comparing the video signals with a blankness threshold, a sync circuit for separating vertical sync signals and horizontal sync signals from the video signals and generating a period signal after each horizontal sync signal, a blank period detector for detecting the output of the comparator within the time period of one period signal and generating a blank signal if no output is detected within said time period, and a display limit generator for generating the top display limit by checking the distribution of the blank signals after a first vertical sync signal and the bottom display limit by checking the distribution of the blank signals before a second vertical sync signal immediately after the first vertical sync signal.

REFERENCES:
patent: 5309234 (1994-05-01), Kranawetter et al.
patent: 5351135 (1994-09-01), Saeger
patent: 5486871 (1996-01-01), Filliman et al.

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