Video split screen technique
AssigneeFairchild Weston Systems, Inc.
InventorsHarvey L. Balopole, Thomas H. Traynor
Life of this patent
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Abstract
A technique is provided for simultaneously displaying on a television screen juxtaposed pictures from two independent image sources. The required picture compression is achieved by storing analog samples of the video signals in an analog memory at one frequency and retrieving the samples at a higher frequency for display. A 2 to 1 picture compression is attained, for example, by retrieving the samples at twice the frequency at which they are stored.
Claims11
Apparatus for producing a simultaneous display of juxtaposed pictures of two independently derived images on a raster scan television monitor comprising:
- a. first and second analog memory means for storing analog video signals representative of substantially all of each of said images;
- b. first timing means coupled to said first and second analog memory means for storing said video signals at a given frequency and for retrieving said stored analog video signals at a frequency higher than said given frequency;
- and
- c. means for combining the outputs of said first and second analog memory means to juxtapose the pictures represented by the video signals stored in each analog memory on said television monitor.
A method for producing a simultaneous display of juxtaposed pictures of two independently derived images on a raster scan television monitor comprising the steps of:
- a. obtaining first and second video signals;
- b. storing substantially all of each of said signals in an analog memory at a given frequency;
- c. retrieving said signals at a frequency higher than said given frequency;
- d. combining the retrieved first and second signals;
- and
- e. displaying the combined signals so that the retrieved first video signals are displayed on a first part of the raster scan line and the retrieved second video signals are displayed on a subsequent second part of the scan line.
Dependencies are inferred from the claim text.