Video disc player with RFI reduction circuit including a signal product generator
US4364119A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1980 |
| Grant date | Dec 14, 1982 |
| Priority date | — |
| Expiry date | Nov 21, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/882
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.