Apparatus and method for injecting an ancillary signal into a low energy density portion of a color television frequency spectrum
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United States of America Patent
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May 13, 1997
Grant Date -
N/A
app pub date -
Mar 6, 1995
filing date -
Mar 6, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An ancillary signal is injected into a program signal within the frequency band normally occupied by the program signal alone. The program signal includes a modulated carrier having a carrier frequency and a low energy density portion of the frequency band. The ancillary signal is selectively added at an injection frequency within the lower energy density portion of the frequency band so that the injection frequency is locked to the carrier frequency and to the frequency of a local oscillator.
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