Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1977-06-28
1979-07-17
Cardillo, Jr., Raymond F.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
1791003V, 1791003G, 365124, H04N 576, G11B 2318, G11B 724
Patent
active
041617525
ABSTRACT:
A video recording disk that is optically readable has data represented in a form that permits data track revolutions to be spaced close together without an intervening guardband or with only a narrow guardband. The track revolutions are in two sets that form a parallel spiral or alternating concentric circles so that a track revolution of one set is separated from other track revolutions of the same set by intervening track revolutions of the other set. Binary data is represented on the tracks by deformations or the absence of deformations, and the record is read as destructive interference in a light beam produced at the location of a deformation. Deformations of the first set of tracks have a depth that is appropriate to be read with a wavelength designated lambda 1, and deformations of the second set have a depth to be read by light of a wavelength lambda 2. Light that is reflected from an adjacent track does not have any significant data content, and the track revolutions can be located close together without producing significant interference in the signals.
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Cardillo, Jr. Raymond F.
International Business Machines - Corporation
Robertson William S.
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