Image display system for displaying picture with smaller aspect

Details Image display system for displaying picture with smaller aspect Image display system for displaying picture with smaller aspect

1991-04-26

1992-12-08

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358141, 358180, H04N 564

Patent

active

051702568

ABSTRACT:
When a composite color TV signal of standard NTSC system with a 4-to-3 aspect ratio and 525 scanning lines is received by a TV receiver with a large aspect ratio of 16 to 9, the NTSC signal is separated into a color video signal for picture and a character data signal. The color video signal for picture is written into a first buffer at a timing of a first clock whose frequency is four times that of an input color subcarrier. The character data signal is written into a second buffer at a timing of a second block with a frequency 16/5 times that of the color subcarrier. The picture video signal and the character data signal are alternately picked up by a selector that swiches between the two buffers at a specified horizontal position on the screen at a timing of a third clock whose frequency is 4/3 times that of the first clock. The output of the selector is fed to the TV receiver to produce a picture on one side of the screen and character data on the other side, utilizing the whole area of the screen. This prevents uneven degradation of the CRT, as would be caused by a partial use of the screen.

REFERENCES:
patent: 4556906 (1985-12-01), Dischert et al.
patent: 4670784 (1987-06-01), Goldberg
patent: 4760455 (1988-07-01), Nagashima
patent: 4928182 (1990-05-01), Guerinot et al.
patent: 4953025 (1990-08-01), Saitoh et al.

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