Video feedback matching circuit and method therefor

Details Video feedback matching circuit and method therefor Video feedback matching circuit and method therefor

1993-11-08

1995-03-07

Kostak, Victor R.

Television

Basic receiver with additional function

For display of additional information

348566, H04N 545

Patent

active

053962966

ABSTRACT:
A circuit (10) for inserting a secondary video signal in a primary video signal. The primary and secondary video signals are combined forming a combined video signal having a primary video portion and a secondary video portion. The combined video signal is fed back to a feedback matching circuit (21) for measuring and comparing the phase, amplitude, and blanking level of a reference signal of the primary video portion and a reference signal of the secondary video portion of the combined video signal. The feedback matching circuit (21) makes an adjustment to the secondary video signal to reduce differences between the reference signals of the primary and secondary video portions of the combined video signal.

REFERENCES:
patent: 4682234 (1987-07-01), Naimpally
patent: 4821086 (1989-04-01), McNeely et al.
patent: 4855812 (1989-08-01), Rokuda et al.
patent: 4992874 (1991-02-01), Willis et al.

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