Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1987-10-20
1989-02-21
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358146, 358147, 358 93, 273DIG28, 364513, H04N 708, A63F 922
Patent
active
048070319
ABSTRACT:
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.
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Correspondence, Leyden, 9/13/86.
Broughton Robert S.
Laumeister William C.
Groody James J.
Interactive Systems, Incorporated
Parker Michael D.
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