Television display apparatus having picture-in-picture display f

Details Television display apparatus having picture-in-picture display f Television display apparatus having picture-in-picture display f

1992-01-10

1993-05-04

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358183, H04N 545

Patent

active

052086607

ABSTRACT:
A television display apparatus is disclosed for forming a small image area in accord with the television signal of a standard system within one portion of the region of a large image area on the screen in accord with the television signal of an HDTV system. The apparatus displays a picture in the small image area within the large area by locally substituting for a first signal to display on the screen a composite picture having a picture of a second signal nested in the picture of the first signal. The apparatus uses three field memories each having a video signal of the second television signal written therein with the cycle. Field detecting apparatus determines whether the video signal in each television signal is a signal form the first field or the second field. The field memory that is not being currently written and has a field which is identical to that of the video signal included in the first television signal being currently scanned is selected for the composite picture.

REFERENCES:
patent: 4267560 (1981-05-01), Ishikawa et al.
patent: 4811103 (1989-03-01), Casey
patent: 4816915 (1989-03-01), Imai et al.
patent: 4982288 (1991-01-01), Isobe et al.
patent: 4984083 (1991-01-01), Okamoto et al.

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