Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1977-02-09
1978-10-03
Cardillo, Jr., Raymond F.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
1791003G, 1791003V, 365124, H04N 576
Patent
active
041187350
ABSTRACT:
A videodisc system utilizes a beam of light which tracks the center of an interrupted spiral information channel. The light beam is "dithered" from side to side of the channel in order to determine the relative "direction" of a beam deviating from the center of the channel. The beam oscillates by approximately one-third of the width of the channel. By multiplying the returned signal by the drive signal, a signal is derived whose mean value is positive on one side of the track, negative on the other side and zero when in the center of the track.
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Cardillo, Jr. Raymond F.
Clark Ronald J.
MCA Disco-Vision, Inc.
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