Apparatus for transmitting auxiliary signal in a TV channel
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United States of America Patent
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-
Nov 5, 1991
Grant Date -
N/A
app pub date -
Aug 11, 1989
filing date -
Aug 11, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for converting a signal having a substantially continuous frequency spectrum to a signal having its energy concentrated at multiples of the line frequency of a video signal, includes circuitry for apportioning the signal into two intermediate signals including, in part, mutually exclusive portions of the original signal and inverting the polarity of portions of the signal. The two intermediate signals are thereafter used to quadrature phase modulate a carrier of multiple line frequency to generate a signal for combining with a video signal for transmission.
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