High dynamics multispectral opto-electrical receiver system

Details High dynamics multispectral opto-electrical receiver system High dynamics multispectral opto-electrical receiver system

1980-04-30

1982-04-13

Martin, John C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358113, H04N 526, H04N 533

Patent

active

043250831

ABSTRACT:
System in which multispectral filtering and variable optical attenuation are effected on the same support. In the case of a supporting disc it has two angular graduated attenuators produced symmetrically with respect to a referenced diameter. Each attenuator also forms optical filters in a given spectral band so as to be able to operate in two separate bands. The disc is positioned in the vicinity of a relay objective positioned between the receiving objective and the opto-electrical transducer. The detected signal supplies a loop controlling the angular position of the disc. The disc is controlled in such a way that the switching of the band takes place on passing through the maximum density zones of the attenuators.

REFERENCES:
patent: 2416919 (1947-03-01), Goldsmith
patent: 2898536 (1959-08-01), Musolf

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