Dynamic information storage or retrieval – Specific detail of information handling portion of system – Electrical modification or sensing of storage medium
Patent
1980-11-07
1982-04-27
Wolff, John H.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Electrical modification or sensing of storage medium
360 38, 3581285, 455303, 375102, H04N 580
Patent
active
043274315
ABSTRACT:
Under certain conditions a video disc player can be responsive to externally applied interference signals to provide a defect in the display of the information recovered from the disc. Apparatus is provided between the pickup circuits and the normal defect compensation apparatus of the player to detect the presence of the external signals and to activate the normal defect compensation apparatus when the external signals are of a relatively high frequency and above a variable offset or threshold level. The threshold is made to vary as a function of the amplitude of the signal provided at the output of the pickup circuits.
REFERENCES:
patent: 2996576 (1961-08-01), Dolby
patent: 3605018 (1971-09-01), Coviello
patent: 4021852 (1977-05-01), Hurst
patent: 4039959 (1977-08-01), Pattontyus-Abraham
patent: 4151471 (1979-04-01), Packard
patent: 4189745 (1980-02-01), Ushio
patent: 4203134 (1980-05-01), Christopher
patent: 4238777 (1980-12-01), Okada
Dieterich Charles B.
Lang Frank B.
Faber Alan
RCA Corporation
Tripoli J. S.
Whitacre E. M.
Wolff John H.
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