Mirror image generator for composite signals with chroma inversi

Details Mirror image generator for composite signals with chroma inversi Mirror image generator for composite signals with chroma inversi

1986-04-17

1988-02-23

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 974

Patent

active

047274115

ABSTRACT:
The mirror image generator for composite signals with chroma inversion includes a first step of orthogonally modulating first and second color difference signals by first and second subcarriers where the subcarriers have 0.degree. and 270.degree. phases with respect to a 90.degree. reference phase; a second step of digitalizing the orthogonal modulation signals; a third step of writing the digitalized orthogonal modulation signals into 2 one horizontal period memories in a predetermined address sequence; and a fourth step of processing a phase transition order of the orthogonal modulation signals resulting in a different phase transition order in which the orthogonal modulation signals are read out of the horizontal period memory such that for a first predetermined amount of data, both the write address sequence and the read address sequence are the same with respect to each other, and for a second predetermined amount of data, the read address sequence is in reverse order from the write address sequence, and for a third predetermined amount of data, both the write and read address sequences are the same with respect to each other.

REFERENCES:
patent: 4070693 (1978-01-01), Shulterly
patent: 4134128 (1979-01-01), Hurst
patent: 4220965 (1980-09-01), Heitmann et al.
patent: 4405942 (1983-09-01), Block et al.
"Mechanism of Mirror Image Display", Television Technique, p. 19-14, May 1984.

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