Apparatus for converting field video signals into frame video si

Facsimile and static presentation processing – Static presentation processing – Attribute control

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Details

358313, H04N 1120, H04N 1122, H04N 980

Patent

active

046059512

ABSTRACT:
An apparatus for converting field video signals into frame video signals includes a modulation circuit for modulating a chrominance subcarrier with a color signal contained in a field video signal, a signal composing circuit for combining the modulated subcarrier with a luminance signal of the field video signal, and a signal converter circuit means for producing a frame video signal including interlaced fields with a time delay applied to alternative one of the fields of the output signals delivered from the signal composing circuit. The time delay is substantially equal in period to half a horizontal scanning time period. The apparatus further includes a signal generator responsive to a first signal which is substantially equal in frequency to the chrominance subcarrier for generating a second signal which is shifted in phase by substantially 90 degrees with respect to the first signal, and a changeover switch for alternately selecting the first and second signals for each field to supply the modulator circuit with either the first or second signal as the chrominance subcarrier.

REFERENCES:
patent: 3886589 (1975-05-01), Nasu
patent: 4152719 (1979-05-01), Kellar
patent: 4247865 (1981-01-01), Mastronardi
patent: 4298896 (1981-11-01), Heitmann

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