Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-09-13
1990-11-27
Shepperd, John W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358140, 358183, 358 22, H04N 5262, H04N 974
Patent
active
049740830
ABSTRACT:
A video special effects mixer including an improved recirculating frame store is disclosed. The mixer receives several inputs one of which is from the recirculating frame store and provides several outputs one of which goes to the recirculating frame store. The recirculating frame store includes two field recirculation loops and an interpolator. The real field is mixed with the previous interpolated recirculated field and the interpolated field is mixed with the previous real recirculated field. The output alternates between the two mixed fields. The recirculating frame store receives a key signal indicating relative gain, and has a key processor that reduces the gain of the recirculating key such that the combined gain is no more than unity.
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Bloomfield John F.
Trytko David E.
Ampex Corporation
Bell John S.
Mossino Ralph L.
Shepperd John W.
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