Circuit configuration for inset-image keying in a television set

Details Circuit configuration for inset-image keying in a television set Circuit configuration for inset-image keying in a television set

1990-10-09

1992-12-22

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358183, H04N 5268, H04N 5272, H04N 545

Patent

active

051737779

ABSTRACT:
A circuit configuration for inset-image keying in a television set having only one tuner and a picture tube includes a control device connected to the tuner for switching the tuning frequency of the tuner between a first image signal of a first program for displaying a large image and a second image signal of a second program for displaying a small image to be keyed into the large image. A switchover device is connected to the tuner and the control device. A large-image signal route for the first image signal has a large-image memory device. A small-image signal route for the second image signal has a small-image memory device. The switchover device alternately supplies the first image signal to the large-image signal route or the second image signal to the small-image signal route. A device reads out and keys the small image into the large image on the picture tube. The large-image memory device continuously supplies the large image during periods of time in which the switchover device is switched to the small-image signal route by repeated readout of the most recently stored large image. The periods of time are selected to enable the small image stored in the small-image memory device to be at least partly rewritten by new second image signals for displaying a new small image.

REFERENCES:
patent: 4249213 (1981-02-01), Imaide
patent: 4623915 (1986-11-01), Bolger
patent: 4816915 (1989-03-01), Imai
patent: 4818981 (1989-03-01), Beaulier
patent: 4855833 (1989-08-01), Kageyama
Siemens Components 26, 1988, No. 6, pp. 240-245, Bromba et al: "Featurebox 88 . . . "; p. 5, Lines 3-4 are pertinent.

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