Video disc player with RFI reduction circuit including a signal

Details Video disc player with RFI reduction circuit including a signal Video disc player with RFI reduction circuit including a signal

1980-11-21

1982-12-14

Faber, Alan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Electrical modification or sensing of storage medium

360 381, 455303, 358167, 358340, H04N 580

Patent

active

043641199

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. The apparatus includes a product generator which multiplies the combined extraneous signal and normally recovered signal with an amplitude limited version of the same signal in order to enhance the probability of detection of extraneous signals even when the amplitude thereof is small relative to the normally recovered signal.

REFERENCES:
patent: 2996576 (1961-08-01), Dolby
patent: 3893168 (1975-07-01), Bechly
patent: 4021852 (1977-05-01), Hurst
patent: 4203134 (1980-05-01), Christopher

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