Apparatus and method for injecting an ancillary signal into a lo

Details Apparatus and method for injecting an ancillary signal into a lo Apparatus and method for injecting an ancillary signal into a lo

1995-03-06

1997-05-13

Kostak, Victor R.

Television

Format

Including additional information

348 1, 348473, H04N 7081

Patent

active

056297394

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.

REFERENCES:
patent: 2982813 (1961-05-01), Hathaway
patent: 3838444 (1974-09-01), Loughlin et al.
patent: 3842196 (1974-10-01), Loughlin
patent: 3924060 (1975-12-01), Bedford
patent: 4025851 (1977-05-01), Haselwood et al.
patent: 4647974 (1987-03-01), Butler et al.
patent: 5404161 (1995-04-01), Douglas et al.

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