Subpicture image signal vertical compression circuit

Details Subpicture image signal vertical compression circuit Subpicture image signal vertical compression circuit

1996-05-30

1998-11-03

Casler, Brian

Television

Basic receiver with additional function

For display of additional information

348565, 348513, H04N 5446

Patent

active

058316841

ABSTRACT:
A subpicture image signal vertical compression circuit for vertically compressing subpictures operating at respective synchronous timings different from that of the main picture when a plurality of image signals having respectively different synchronizations are displayed on an image display device. Depending on whether the field polarities of main and sub pictures are the same or not, the subpicture image signal vertical compression circuit generates suitable offsets for the first and the second fields to adjust the phases and prevent the inversion of the scan order in the vertical direction, at the first field and the second field of subpicture signal, after the phase adjustment to obtain a subpicture image with natural motion in the vertical direction.

REFERENCES:
patent: 4249213 (1981-02-01), Imaide et al.
patent: 4638360 (1987-01-01), Christopher et al.
patent: 4816915 (1989-03-01), Imai et al.
patent: 4984083 (1991-01-01), Okamoto et al.
patent: 4991013 (1991-02-01), Kobayashi
patent: 4992874 (1991-02-01), Willia et al.
patent: 5021887 (1991-06-01), Park

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