Back to results
US 4,888,638 AGranted
System for substituting television programs transmitted via telephone lines
AssigneeA. C. Nielsen Company
InventorJerry W. Bohn
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeA. C. Nielsen Company
InventorJerry W. Bohn
Estimating the term…
A market research system is shown for substituting stored television programs for regularly scheduled, broadcast television programs having a particular identification code wherein the substitute television programs may be transmitted via telephone lines to the households of cooperating panelists for storage. The substitute television programs may be stored and/or transmitted to the panelists's home in compacted or noncompacted form. In compacted form, a memory stores the first frame of video information for the substitute television program and for subsequent frames, stores only the video information representing a change from the video information stored for a previous frame. In one embodiment, the stored video information represents the difference between each frame and the first frame. In a second embodiment, the video change information represents the differences between each frame and the immediately preceding frame. A system for encoding an identification code in the leading overscan portion of the active line period of a horizontal line of video information is also shown.
A system for substituting on a television in a household a stored television program for a scheduled television program having an identification code, comprising, at the household:
A system for substituting on a cathode ray tube display in a household a series of frames of stored video information for a series of frames of transmitted video information having an identification code, comprising, at the household:
A system for substituting on a television a television program transmitted over a telephone line for a scheduled television program having an identification code, comprising:
Dependencies are inferred from the claim text.