Method and circuit for picture-in-picture superimposition

Details Method and circuit for picture-in-picture superimposition Method and circuit for picture-in-picture superimposition

2005-03-22

2005-03-22

Kostak, Victor R. (Department: 2614)

Television

Basic receiver with additional function

For display of additional information

C348S511000, C348S718000

Reexamination Certificate

active

06870572

ABSTRACT:
A method for picture-in-picture insertion is described, which is distinguished in particular by the fact thatthe inset pictures are written to a memory device (2) in a circulating manner under continuously incremented write addresses,the first and last address of each written-in inset picture is stored,an overtake signal is formed by comparing the instantaneous address with the previously stored address, said signal indicating whether a previous address has been reached again and, consequently, the corresponding picture content has been overwritten,by evaluation of the overtake signal, the current or preceding segment is selected for read-out depending on whether or not overtaking took place before the start of the read-out, andthe inset picture stored in the selected segment is read out with continuously incremented read addresses and is inserted into the main picture. A corresponding circuit arrangement is also described.

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English Translation of PCT International Preliminary Examination Report, dated Mar. 7, 2001, 8 pgs.
Masuda et al., “Picture in Picture System with a Digital Memory for VCRs”, IEEE Transactions on Consumer Electronics, vol. CE-33, No. 3, Aug. 1987, pp. 230-238.

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