Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1975-07-14
1977-04-19
Cardillo, Jr., Raymond F.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
360 73, H04N 576
Patent
active
040189872
ABSTRACT:
Video disc record is provided with a spiral information track containing recorded representations of composite video signals. The information represents occupying the length of each convolution of the spiral depart slightly from an integral number of field intervals by a fixed amount. The departure amount is such that the information content per spiral convolution corresponds to a given integral number of line intervals plus a predetermined fraction of a line interval (other than one-half). Synchronizing information locations in successive convolutions are thus staggered in a spiral manner. In record player apparatus for such a record, a power line synchronous drive system is employed to control rotation of the player's turntable. Separation of horizontal sync signals from the composite video signals recovered during playback of such a record, provides recurring information which is indicative, through its phasing, of the occurrence of a spurious pickup jump to an adjacent convolution, and the direction of such a jump.
REFERENCES:
patent: 3646259 (1972-02-01), Schuller
patent: 3796825 (1974-03-01), Redlich et al.
patent: 3934262 (1976-01-01), Snopko
Cardillo, Jr. Raymond F.
Meagher William H.
RCA Corporation
Whitacre Eugene M.
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