Dynamic information storage or retrieval – With servo positioning of transducer assembly over track...
Patent
1980-03-07
1982-12-07
Cardillo, Jr., Raymond F.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
358342, 369 32, 369 33, 369 59, 369126, G11B 906, G11B 1702, G11B 2110
Patent
active
043631177
ABSTRACT:
A video disc playback system having digital circuitry for detecting degradation in recovered signal. Circuitry is included to determine probable errors in the digital components of signal recovered from the disc record. A digital reference number is generated by storing a valid digital number recovered from the disc and incrementing that number by a constant in accordance with the normal progression of numbers prerecorded on the disc. The recovered numbers are compared with the generated reference numbers to generate an error signal on mismatch. The error signal is used to weight a constant binary number by one or zero, the result being added to an accumulated error function. The sum is weighted, the result becoming the updated accumulated error function for the next iteration on the occurrence of the subsequently recovered digital number. The weighted sum is also compared against a predetermined value and a control signal is generated on the weighted sum exceeding the predetermined value. The control signal is used to attempt to overcome at least one cause of the signal degradation.
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Cardillo, Jr. Raymond F.
Herrmann E. P.
RCA Corporation
Tripoli J. S.
Whitacre E. M.
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