Device for reading a disk-shaped record carrier with time base correction
US4005260A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 17, 1975 |
| Grant date | Jan 25, 1977 |
| Priority date | — |
| Expiry date | Jun 17, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7605
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Device for reading-out a disk-shaped record carrier. To compensate for time-base errors of the detected signal caused by eccentricity or out-of-roundness of the record carrier, a tangential tracking system is provided with which the tangential position of the scanning point on the record carrier can be controlled. A control signal for this tangential tracking system is obtained by extracting the line synchronizing signal from the detected video signal. By ensuring through the use of a filter element that the overall transfer function of the control system exhibits a band-pass characteristic about the frequency which corresponds to the speed of the record carrier, a suitable tangential tracking is ensured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.