Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1975-07-14
1977-05-10
Cardillo, Jr., Raymond F.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 4, 358129, 358130, H04N 576
Patent
active
040229688
ABSTRACT:
Video disc record is provided with a spiral information track containing recorded representations of composite video signals. The information representations 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 is successive convolutions are thus staggered in a spiral manner. Recording apparatus for forming such a record includes means for maintaining the rate of rotation of a recording turntable substantially constant at a rate which differs from an integral submultiple of the field rate of the composite video signals supplied to the recorded by an appropriate small amount. In an illustrative embodiment of the invention, the departure amount is selected in such manner that recovery from the disc record of composite color video signals with a (U.S. color broadcast standard) field rate of approximately 59.94 fields per second may be effected by playback apparatus employing a turntable rotation rate (e.g., 7.5 rps) which is an integral submultiple of the power line frequency (e.g., 60 Hz).
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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