Cancelling cross modulation in two color TV signals passed throu

Details Cancelling cross modulation in two color TV signals passed throu Cancelling cross modulation in two color TV signals passed throu

1979-06-28

1981-04-28

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 36, 358 11, H04N 938

Patent

active

042649196

ABSTRACT:
When two color television signals are transmitted over a common non-linear path, such as a transponder in a communications satellite, the two color subcarriers at slightly different frequencies cross modulate each other and produce disturbances on the screens of color monitors and receivers. The color cross talk can be cancelled by delaying alternate lines between horizontal synchronizing pulses of solely one of the television video signals by half the period of the color subcarrier at the transmitting terminal, and delaying intermediate lines between horizontal synchronizing pulses of solely the same television video signal by half the period of the subcarrier at the receiving terminal. Color synchronizing disturbances in television receivers receptive to the same one of the video signals are avoided by cancelling the color subcarrier frequency components on the horizontal synchronizing pulses of the video signal at the receiving terminal.

REFERENCES:
patent: 4120001 (1978-10-01), Abbott et al.

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