Spread spectrum digital data transmission over TV video
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United States of America Patent
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-
Sep 7, 1993
Grant Date -
N/A
app pub date -
Dec 20, 1991
filing date -
Dec 20, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A co-channel communication system allows transmission of one or more data signals in an active or visible portion of a video raster in a manner that is imperceptible to a viewer. More particularly, the data signal is transmitted over a preselected active video lines of a video raster. In order to reduce the perceptibility of the data signal, the video lines over which the data signal is transmitted is varied according to a random sequence. In an alternate embodiment, the data is also modulated at relatively low modulation levels, for example, by converting the data signal to a spread spectrum signal.
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