Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1977-01-05
1981-06-09
Griffin, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
250320, 250333, 313389, 315 534, 315 11, 358167, 358218, 358227, H04N 532, H01J 3149, H01J 2308, H04N 521
Patent
active
042727820
ABSTRACT:
The light which is emitted from the output screen of an image intensifier and passed through a subsequent output objective, is converted into an electrical signal by means of a photomultiplier tube or an image pick-up tube. The noise or modulation content of the electrical signal are measured. An optimum adjustment of the focussing position of the output objective and the magnitude of the focussing voltage applied to the imge intensifier, cause the noise or modulation content to attain an extreme value, e.g. a maximum. The focussing voltage and the focussing position of the output objective are iteratively adjusted.
REFERENCES:
patent: 3894181 (1975-07-01), Mistretta et al.
Monte George L. A.
Proper Johannes
Schuur Jacob
Westerveld Eduard P.
Briody Thomas A.
Coles Edward L.
Griffin Robert L.
Haken Jack E.
Mayer Robert T.
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