04807031 is referenced by 641 patents and cites 39 patents.

Method and apparatus for in-band, video broadcasting of commands to interactive devices are described. Control data are encoded by subliminally modulating, prior to the remote, composite video broadcast of video program material, a selected sequence of video image fields. The resulting modulated video fields within the viewing area of a television, each having alternately, proportionately raised and lowered luminance horizontal scan lines, are monitored by a light sensitive device positioned adjacent the user's television screen. A semirigid, twisted pair cable connects the device to nearby receiver/transmitter electronics that discriminate the binary data from the program material and amplitude modulate a high frequency infrared (IR) carrier with the data. Interactive devices, e.g. educational aids or action toys, within range of the wireless IR transmission detect energy in this frequency range, decode the commands embedded in the control data, and selectively execute predetermined actions in response to the data-encoded broadcast. In a proposed modification, low radio frequency (RF) electromagnetic radiation emanating from the television's raster scan electronics is coupled by a conventional RF antenna to the receiver electronics, which identically discriminate the binary data, from the program material, for transmission to the interactive devices.

Title
Interactive video method and apparatus
Application Number
7/112713
Publication Number
4807031
Application Date
October 20, 1987
Publication Date
February 21, 1989
Inventor
William C Laumeister
San Jose
CA, US
Robert S Broughton
Beaverton
OR, US
Agent
Kolisch Hartwell & Dickinson
Assignee
Interactive Systems Incorporated
OR, US
IPC
A63F 9/22
H04N 7/08
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