Second video program

Details Second video program Second video program

1990-11-15

1992-09-15

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358183, H04N 704, H04N 5262, H04N 5272

Patent

active

051482754

ABSTRACT:
A television receiver having a video memory receives a small number of lines of a second low motion content video program transmitted during the vertical blanking interval of a first normal video program, stores and accumulates the lines of the second video program in video memory, and displays the image of the second video program when it is fully assembled. Audio for the second video program is conveyed via a second audio program (SAP) channel. In this manner two video programs, each of which is encoded in a standard television format (i.e., NTSC, PAL, or SECAM) can be received by a single tuner tuned to a single channel. In an embodiment utilizing picture-in-picture processing circuitry, the second video program can be displayed in an inset area of the screen.

REFERENCES:
patent: 4680629 (1987-07-01), Fukushima et al.
patent: 4716589 (1987-12-01), Matsui
patent: 4774582 (1988-09-01), Hakamada et al.
patent: 4914516 (1990-04-01), Duffield
patent: 5036394 (1991-07-01), Morii et al.
Shunjiro Harada, "A Still-Picture Multiplexed Television System", NHK Laboratories Note, No. 194, pp. 2-11, Feb. 1976.

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