Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1977-05-27
1979-07-03
Cardillo, Jr., Raymond F.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
1791003V, 1791003G, 365124, H04N 576, G11B 712
Patent
active
041602692
ABSTRACT:
Apparatus for reading a record carrier provided with a spiral structure in which sound and/or image information is stored in the form of frequency modulated or phase modulated signals is disclosed. The carrier structure is composed of coplanar regions of variable length separated by coplanar areas of variable length. Where the regions and areas are all in the same plane the regions and areas have different coefficients of reflection or transmission. Where the regions and areas are not coplanar they are spaced by a distance sufficient to produce in response to impinging radiation a one-half wave length difference in the radiation exiting the regions and areas. The apparatus provides a light beam with a frequency that facilitates diffraction of the beam by the areas and regions, and also provides a radiation sensitive detection system for converting the light beam modulations caused by the record carrier into a corresponding electrical signal.
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Fleisher et al., Readout From Thermoplastic Record Element, IBM Tech. Disc. Bulletin, vol. 10, No. 7, 12/67, 975-976.
Compaan Klaas
Forsthuber Robert F. K.
Kramer Pieter
Briody Thomas A.
Cardillo, Jr. Raymond F.
Cohen Simon L.
Streeter William J.
U.S. Philips Corporation
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