System for multiplexing information channels adjacent to a video

Details System for multiplexing information channels adjacent to a video System for multiplexing information channels adjacent to a video

1975-11-03

1978-03-07

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358142, 325346, H04N 710, H04N 708, H04B 106

Patent

active

040782450

ABSTRACT:
A system for multiplexing either a single or multiple information channels adjacent to the video spectrum on a TV microwave or cable by frequency modulating a high frequency subcarrier at wide deviation with one or composite information signals, translating the modulated subcarrier to a frequency adjacent to and above the video spectrum, and then bridging it into the video circuit at a level 20 dB or more below the peak video signal of the video spectrum. The system recovers the transmitted subcarrier from the video spectrum, synthesizes the subcarrier frequencies exclusive of most of the video interference in a limited bandwidth, and then detects the modulation of the synthesized subcarrier frequency.

REFERENCES:
patent: 2708716 (1955-05-01), Boothroyd
patent: 3195059 (1965-07-01), Adams
patent: 3371281 (1968-02-01), Powell
patent: 3530383 (1970-09-01), Sassler
patent: 3684823 (1972-08-01), McVoy
patent: 3889051 (1975-06-01), Legler
patent: 3917906 (1975-11-01), Johnson et al.

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