Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1980-05-08
1982-03-30
Moffitt, James W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
369 43, H04N 576, G11B 2108
Patent
active
043227481
ABSTRACT:
A high-speed reproducing system is employed in an apparatus for reproducing signals from a rotary recording medium having an information signal recorded in the track formed thereon in a spiral path or a concentric circular form and having reference signals recorded thereon interrelatedly with the information signal track, the high-speed reproducing system comprises a reproducing transducer having a reproducing element for reproducing the information signal and the reference signals recorded on the rotary recording medium, and tracking control mechanism for accomplishing tracking control so that the reproducing element traces the information signal track, a feeding mechanism for feeding the reproducing transducer in a feeding travel over the rotary recording medium, with transducer movement in the radial direction thereof, a circuit for producing a tracking control signal in response to the reference signals reproduced by the reproducing transducer and for supplying the tracking control signal to the tracking control mechanism, and a shift pulse generating circuit for generating a train of shift pulses having a desired repetitive frequency and for supplying the shift pulses to the tracking control mechanism. The reproducing element is shifted to trace an adjacent track sequentially every time when the shift pulse is supplied to the tracking control mechanism.
REFERENCES:
patent: Re29963 (1979-04-01), Janssen
patent: 3911211 (1975-10-01), Rennick
patent: 3973080 (1976-08-01), Dickopp et al.
patent: 4057832 (1977-11-01), Kappert
patent: 4152727 (1979-05-01), Tatsuguchi et al.
patent: 4189758 (1980-02-01), Morio et al.
Bernat Louis
McElheny Jr. Donald
Moffitt James W.
Victor Company of Japan Ltd.
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